Merge remote-tracking branch 'origin/master' into add-source-spans

.atom-build.yml

@@ -7,7 +7,5 @@ targets:
   test:
     cmd: stack build :integration-test
     keymap: cmd-u
-  semantic-git-diff:
-    cmd: stack build :semantic-git-diff
 errorMatch:
 - \n(?<file>/[^:]+):(?<line>\d+):((?<col>\d+):)?

.gitmodules

@@ -16,3 +16,6 @@
 [submodule "test/repos/backbone"]
 	path = test/repos/backbone
 	url = https://github.com/jashkenas/backbone
+[submodule "test/corpus/repos/javascript"]
+	path = test/corpus/repos/javascript
+	url = https://github.com/rewinfrey/javascript

ROADMAP.md

@@ -12,7 +12,7 @@ This is the long form version of our [roadmap project][].
 2. [Semantic diffs][] on .com for C & JavaScript. Q4 2016 or so.
 
   - Performance, as above.
-  - Resilience. A fault in `semantic-git-diff` should not break anything else.
+  - Resilience. A fault in `semantic-diff` should not break anything else.
   - Metrics. We need to know how it’s behaving in the wild to know what to do about it. This also includes operational metrics such as health checks.
 
 ## Follow-up things:

app/GenerateTestCases.hs

@@ -0,0 +1,246 @@
+{-# LANGUAGE LambdaCase #-}
+module Main where
+
+import Arguments
+import Control.Exception
+import Data.Aeson
+import Data.Aeson.Encode.Pretty
+import Data.Map.Strict as Map
+import qualified Data.ByteString.Lazy as DL
+import qualified Data.ByteString.Char8 as DC
+import Data.String
+import qualified Data.Text as DT
+import JSONTestCase
+import qualified Prelude
+import Prologue
+import SemanticDiff (fetchDiffs)
+import System.FilePath.Glob
+import System.Process
+import qualified Data.String.Utils as DSUtils
+import Options.Applicative hiding ((<>))
+import qualified Options.Applicative as O
+import qualified Renderer as R
+
+data GeneratorArgs = GeneratorArgs { generateResults :: Bool } deriving (Show)
+
+generatorArgs :: Parser GeneratorArgs
+generatorArgs = GeneratorArgs <$> switch ( long "generate-results" O.<> short 'g' O.<> help "Use generated expected results for new JSON test cases (rather than defaulting to an empty \"\")" )
+
+options :: ParserInfo GeneratorArgs
+options = info (helper <*> generatorArgs) (fullDesc O.<> progDesc "Auto-generate JSON test cases" O.<> header "JSON Test Case Generator")
+
+main :: IO ()
+main = do
+  opts <- execParser options
+  generatorFilePaths <- runFetchGeneratorFiles
+  unparsedGeneratorCases <- traverse DL.readFile generatorFilePaths
+  let parsedGeneratorCases = eitherDecode <$> unparsedGeneratorCases :: [Either String [JSONMetaRepo]]
+  traverse_ (handleGeneratorCases opts generatorFilePaths) parsedGeneratorCases
+  where handleGeneratorCases :: GeneratorArgs -> [FilePath] -> Either String [JSONMetaRepo] -> IO ()
+        handleGeneratorCases opts generatorFilePaths parsedGeneratorCase =
+          case parsedGeneratorCase of
+            Left err ->  Prelude.putStrLn $ "An error occurred: " <> err
+            Right metaTestCases -> do
+              traverse_ (runGenerator opts) metaTestCases
+              traverse_ runMoveGeneratorFile generatorFilePaths
+
+-- | Finds all JSON files within the generators directory.
+runFetchGeneratorFiles :: IO [FilePath]
+runFetchGeneratorFiles = globDir1 (compile "*.json") "test/corpus/generators"
+
+-- | First initialize the git submodule repository where commits will be made for the given metaRepo and its syntaxes.
+-- | Second generate the commits for each syntax and generate the associated JSONTestCase objects.
+-- | Finally push the generated commits to the submodule's remote repository.
+runGenerator :: GeneratorArgs -> JSONMetaRepo -> IO ()
+runGenerator opts metaRepo@JSONMetaRepo{..} = do
+  runSetupGitRepo metaRepo
+  runCommitsAndTestCasesGeneration opts metaRepo
+  runUpdateGitRemote repoPath
+
+-- | Upon successful test case generation for a generator file, move the file to the generated directory.
+-- | This prevents subsequence runs of the test generator from duplicating test cases and adding extraneous
+-- | commits to the git submodule.
+runMoveGeneratorFile :: FilePath -> IO ()
+runMoveGeneratorFile filePath = do
+  let updatedPath = DT.unpack $ DT.replace (DT.pack "generators") (DT.pack "generated") (DT.pack filePath)
+  Prelude.putStrLn updatedPath
+  _ <- readCreateProcess (shell $ "mv " <> filePath <> " " <> updatedPath) ""
+  return ()
+
+-- | Initializes a new git repository and adds it as a submodule to the semantic-diff git index.
+-- | This repository contains the commits associated with the given JSONMetaRepo's syntax examples.
+runSetupGitRepo :: JSONMetaRepo -> IO ()
+runSetupGitRepo JSONMetaRepo{..} = do
+  runInitializeRepo repoUrl repoPath
+  runAddSubmodule repoUrl repoPath
+
+-- | Performs the system calls for initializing the git repository.
+-- | If the git repository already exists, the operation will result in an error,
+-- | but will not prevent successful completion of the test case generation.
+runInitializeRepo :: String -> FilePath -> IO ()
+runInitializeRepo repoUrl repoPath = do
+  result <- try $ readCreateProcess (shell $ mkDirCommand repoPath) ""
+  case (result :: Either Prelude.IOError String) of
+    Left error -> Prelude.putStrLn $ "Creating the repository directory at " <> repoPath <> " failed with: " <> show error <> ". " <> "Possible reason: repository already initialized. \nProceeding to the next step."
+    Right _ -> do
+      _ <- executeCommand repoPath (initializeRepoCommand repoUrl)
+      Prelude.putStrLn $ "Repository directory successfully initialized for " <> repoPath <> "."
+
+-- | Git repositories generated as a side-effect of generating tests cases are
+-- | added to semantic-diff's git index as submodules. If the submodule initialization
+-- | fails (usually because the submodule was already initialized), operations will
+-- | continue.
+runAddSubmodule :: String -> FilePath -> IO ()
+runAddSubmodule repoUrl repoPath = do
+  result <- try $ readCreateProcess (shell $ addSubmoduleCommand repoUrl repoPath) ""
+  case (result :: Either Prelude.IOError String) of
+    Left error -> Prelude.putStrLn $ "Initializing the submodule repository at " <> repoPath <> " failed with: " <> show error <> ". " <> "Possible reason: submodule already initialized. \nProceeding to the next step."
+    _ -> Prelude.putStrLn $ "Submodule successfully initialized for " <> repoPath <> "."
+
+-- | Performs the system calls for generating the commits and test cases.
+-- | Also appends the JSONTestCases generated to the test case file defined by
+-- | the syntaxes.
+runCommitsAndTestCasesGeneration :: GeneratorArgs -> JSONMetaRepo -> IO ()
+runCommitsAndTestCasesGeneration opts JSONMetaRepo{..} =
+  for_ syntaxes generate
+    where generate :: JSONMetaSyntax -> IO ()
+          generate metaSyntax = do
+            _ <- runInitialCommitForSyntax repoPath metaSyntax
+            runSetupTestCaseFile metaSyntax
+            runCommitAndTestCaseGeneration opts language repoPath metaSyntax
+            runCloseTestCaseFile metaSyntax
+
+-- | For a syntax, we want the initial commit to be an empty file.
+-- | This function performs a touch and commits the empty file.
+runInitialCommitForSyntax :: FilePath -> JSONMetaSyntax -> IO ()
+runInitialCommitForSyntax repoPath JSONMetaSyntax{..} = do
+  Prelude.putStrLn $ "Generating initial commit for " <> syntax <> " syntax."
+  result <- try . executeCommand repoPath $ touchCommand repoFilePath <> commitCommand syntax "Initial commit"
+  case ( result :: Either Prelude.IOError String) of
+    Left error -> Prelude.putStrLn $ "Initializing the " <> repoFilePath <> " failed with: " <> show error <> ". " <> "Possible reason: file already initialized. \nProceeding to the next step."
+    Right _ -> pure ()
+
+-- | Initializes the test case file where JSONTestCase examples are written to.
+-- | This manually inserts a "[" to open a JSON array.
+runSetupTestCaseFile :: JSONMetaSyntax -> IO ()
+runSetupTestCaseFile metaSyntax = do
+  Prelude.putStrLn $ "Opening " <> testCaseFilePath metaSyntax
+  DL.writeFile (testCaseFilePath metaSyntax) "["
+
+-- | For each command constructed for a given metaSyntax, execute the system commands.
+runCommitAndTestCaseGeneration :: GeneratorArgs -> String -> FilePath -> JSONMetaSyntax -> IO ()
+runCommitAndTestCaseGeneration opts language repoPath metaSyntax@JSONMetaSyntax{..} =
+   traverse_ (runGenerateCommitAndTestCase opts language repoPath) (commands metaSyntax)
+
+maybeMapSummary :: [R.Output] -> [Maybe (Map Text (Map Text [Value]))]
+maybeMapSummary = fmap $ \case
+    R.SummaryOutput output -> Just output
+    _ -> Nothing
+
+-- | This function represents the heart of the test case generation. It keeps track of
+-- | the git shas prior to running a command, fetches the git sha after a command, so that
+-- | JSONTestCase objects can be created. Finally, it appends the created JSONTestCase
+-- | object to the test case file.
+runGenerateCommitAndTestCase :: GeneratorArgs -> String -> FilePath -> (JSONMetaSyntax, String, String, String) -> IO ()
+runGenerateCommitAndTestCase opts language repoPath (JSONMetaSyntax{..}, description, seperator, command) = do
+  Prelude.putStrLn $ "Executing " <> syntax <> " " <> description <> " commit."
+  beforeSha <- executeCommand repoPath getLastCommitShaCommand
+  _ <- executeCommand repoPath command
+  afterSha <- executeCommand repoPath getLastCommitShaCommand
+
+  (summaryChanges, summaryErrors) <- runMaybeSummaries beforeSha afterSha repoPath repoFilePath opts
+
+  let jsonTestCase = encodePretty JSONTestCase {
+    gitDir = extractGitDir repoPath,
+    testCaseDescription = language <> "-" <> syntax <> "-" <> description <> "-" <> "test",
+    filePaths = [repoFilePath],
+    sha1 = beforeSha,
+    sha2 = afterSha,
+    expectedResult = Map.fromList [
+      ("changes", fromMaybe (Map.singleton mempty mempty) summaryChanges),
+      ("errors", fromMaybe (Map.singleton mempty mempty) summaryErrors)
+      ]
+    }
+
+  Prelude.putStrLn $ "Generating test case for " <> language <> ": " <> syntax <> " " <> description <> "."
+
+  DL.appendFile testCaseFilePath $ jsonTestCase <> DL.fromStrict (DC.pack seperator)
+  where extractGitDir :: String -> String
+        extractGitDir fullRepoPath = DC.unpack $ snd $ DC.breakSubstring (DC.pack "test") (DC.pack fullRepoPath)
+
+-- | Conditionally generate the diff summaries for the given shas and file path based
+-- | on the -g | --generate flag. By default diff summaries are not generated when
+-- | constructing test cases, and the tuple (Nothing, Nothing) is returned.
+runMaybeSummaries :: String -> String -> FilePath -> FilePath -> GeneratorArgs -> IO (Maybe (Map Text [Value]), Maybe (Map Text [Value]))
+runMaybeSummaries beforeSha afterSha repoPath repoFilePath GeneratorArgs{..}
+  | generateResults = do
+      diffs <- fetchDiffs $ args repoPath beforeSha afterSha [repoFilePath] R.Summary
+      let headResult = Prelude.head $ maybeMapSummary diffs
+      let changes = fromMaybe (fromList [("changes", mempty)]) headResult ! "changes"
+      let errors = fromMaybe (fromList [("errors", mempty)]) headResult ! "errors"
+      return (Just changes, Just errors)
+  | otherwise = return (Nothing, Nothing)
+
+-- | Commands represent the various combination of patches (insert, delete, replacement)
+-- | for a given syntax.
+commands :: JSONMetaSyntax -> [(JSONMetaSyntax, String, String, String)]
+commands metaSyntax@JSONMetaSyntax{..} =
+  [ (metaSyntax, "insert", commaSeperator, fileWriteCommand repoFilePath insert <> commitCommand syntax "insert")
+  , (metaSyntax, "replacement-insert", commaSeperator, fileWriteCommand repoFilePath (Prologue.intercalate "\n" [replacement, insert, insert]) <> commitCommand syntax "replacement + insert + insert")
+  , (metaSyntax, "delete-insert", commaSeperator, fileWriteCommand repoFilePath (Prologue.intercalate "\n" [insert, insert, insert]) <> commitCommand syntax "delete + insert")
+  , (metaSyntax, "replacement", commaSeperator, fileWriteCommand repoFilePath (Prologue.intercalate "\n" [replacement, insert, insert]) <> commitCommand syntax "replacement")
+  , (metaSyntax, "delete-replacement", commaSeperator, fileWriteCommand repoFilePath (Prologue.intercalate "\n" [insert, replacement]) <> commitCommand syntax "delete + replacement")
+  , (metaSyntax, "delete", commaSeperator, fileWriteCommand repoFilePath replacement <> commitCommand syntax "delete")
+  , (metaSyntax, "delete-rest", spaceSeperator, removeCommand repoFilePath <> touchCommand repoFilePath <> commitCommand syntax "delete rest")
+  ]
+  where commaSeperator = "\n,"
+        spaceSeperator = ""
+
+-- | Pushes git commits to the submodule repository's remote.
+runUpdateGitRemote :: FilePath -> IO ()
+runUpdateGitRemote repoPath = do
+  Prelude.putStrLn "Updating git remote."
+  _ <- executeCommand repoPath pushToGitRemoteCommand
+  Prelude.putStrLn "Successfully updated git remote."
+
+-- | Closes the JSON array and closes the test case file.
+runCloseTestCaseFile :: JSONMetaSyntax -> IO ()
+runCloseTestCaseFile metaSyntax = do
+  Prelude.putStrLn $ "Closing " <> testCaseFilePath metaSyntax
+  DL.appendFile (testCaseFilePath metaSyntax) "]\n"
+
+initializeRepoCommand :: String -> String
+initializeRepoCommand repoUrl = "rm -rf *; rm -rf .git; git init .; git remote add origin " <> repoUrl <> ";"
+
+addSubmoduleCommand :: String -> FilePath -> String
+addSubmoduleCommand repoUrl repoPath = "git submodule add " <> repoUrl <> " " <> " ./" <> repoPath <> ";"
+
+getLastCommitShaCommand :: String
+getLastCommitShaCommand = "git log --pretty=format:\"%H\" -n 1;"
+
+touchCommand :: FilePath -> String
+touchCommand repoFilePath = "touch " <> repoFilePath <> ";"
+
+-- | In order to correctly record syntax examples that include backticks (like JavaScript template strings)
+-- | we must first escape them for bash (due to the use of the `echo` system command). Additionally,
+-- | we must also escape the escape character `\` in Haskell, hence the double `\\`.
+fileWriteCommand :: FilePath -> String -> String
+fileWriteCommand repoFilePath contents = "echo \"" <> (escapeBackticks . escapeDoubleQuotes) contents <> "\" > " <> repoFilePath <> ";"
+  where
+    escapeBackticks = DSUtils.replace "`" "\\`"
+    escapeDoubleQuotes = DSUtils.replace "\"" "\\\""
+
+commitCommand :: String -> String -> String
+commitCommand syntax commitMessage = "git add .; git commit -m \"" <> syntax <> ": " <> commitMessage <> "\"" <> ";"
+
+removeCommand :: FilePath -> String
+removeCommand repoFilePath = "rm " <> repoFilePath <> ";"
+
+pushToGitRemoteCommand :: String
+pushToGitRemoteCommand = "git push origin HEAD;"
+
+mkDirCommand :: FilePath -> String
+mkDirCommand repoPath = "mkdir " <> repoPath <> ";"
+
+executeCommand :: FilePath -> String -> IO String
+executeCommand repoPath command = readCreateProcess (shell command) { cwd = Just repoPath } ""

app/Main.hs

@@ -0,0 +1,3 @@
+module Main (main)
+where
+import SemanticDiff (main)

bench/Main.hs

@@ -10,11 +10,16 @@ import Patch
 import Prologue
 import SES
 import Test.QuickCheck hiding (Fixed)
+import Arguments
+import SemanticDiff (fetchDiffs)
+import qualified Renderer as R
+import qualified SemanticDiffPar
+import System.Directory (makeAbsolute)
 
 main :: IO ()
 main = do
   benchmarks <- sequenceA [ generativeBenchmarkWith "ses" 10 arbitrarySESInputs (uncurry ((*) `on` length)) (nf (uncurry benchmarkSES)) ]
-  defaultMain benchmarks
+  defaultMain (syncAsyncBenchmark : benchmarks)
   where arbitrarySESInputs = (,) <$> sized (`vectorOf` arbitrary) <*> sized (`vectorOf` arbitrary)
 
 benchmarkSES :: [String] -> [String] -> [Either String (Patch String)]
@@ -39,3 +44,31 @@ generativeBenchmarkWith name n generator metric benchmark = do
           let measurement = metric input
           pure $! (measurement, bench (show measurement) (benchmark input))
         defaultSize = 100
+
+syncAsyncBenchmark :: Benchmark
+syncAsyncBenchmark =
+  bgroup "async vs par" [
+      bench "async" . whnfIO $ SemanticDiff.fetchDiffs =<< theArgs,
+      bench "par" . whnfIO $ SemanticDiffPar.fetchDiffs =<< theArgs
+    ]
+
+theArgs :: IO Arguments
+theArgs = do
+  jqueryPath <- makeAbsolute "test/repos/jquery"
+  pure $ args jqueryPath sha1 sha2 files R.Patch
+  where
+    sha1 = "70526981916945dc4093e116a3de61b1777d4718"
+    sha2 = "e5ffcb0838c894e26f4ff32dfec162cf624d8d7d"
+    files = [
+            "src/manipulation/getAll.js",
+            "src/manipulation/support.js",
+            "src/manipulation/wrapMap.js",
+            "src/offset.js",
+            "test/unit/css.js",
+            "test/unit/deferred.js",
+            "test/unit/deprecated.js",
+            "test/unit/effects.js",
+            "test/unit/event.js",
+            "test/unit/offset.js",
+            "test/unit/wrap.js"
+            ]

bench/SemanticDiffPar.hs

@@ -0,0 +1,12 @@
+module SemanticDiffPar where
+
+import Arguments
+import qualified Control.Monad.Par.IO as ParIO
+import Control.Monad.Reader
+import qualified Data.Text as T
+import Prologue
+import qualified Renderer as R
+import SemanticDiff
+
+fetchDiffs :: Arguments -> IO [T.Text]
+fetchDiffs args@Arguments{..} = pure . pure . R.concatOutputs =<< (ParIO.runParIO . liftIO $ for filePaths (fetchDiff args))

semantic-diff.cabal

@@ -1,5 +1,5 @@
 name:                semantic-diff
-version:             0.1.0
+version:             0.2.0
 synopsis:            Initial project template from stack
 description:         Please see README.md
 homepage:            http://github.com/github/semantic-diff#readme
@@ -20,13 +20,14 @@ library
                      , Data.Align.Generic
                      , Data.Bifunctor.Join.Arbitrary
                      , Data.Functor.Both
-                     , Data.RandomWalkSimilarity
-                     , Data.Record
                      , Data.Mergeable
                      , Data.Mergeable.Generic
+                     , Data.RandomWalkSimilarity
+                     , Data.Record
                      , Diff
                      , Diff.Arbitrary
                      , Diffing
+                     , DiffSummary
                      , Info
                      , Interpreter
                      , Language
@@ -36,12 +37,15 @@ library
                      , Parser
                      , Patch
                      , Patch.Arbitrary
+                     , Paths_semantic_diff
+                     , Prologue
                      , Range
                      , Renderer
                      , Renderer.JSON
                      , Renderer.Patch
                      , Renderer.Split
                      , Renderer.Summary
+                     , SemanticDiff
                      , SES
                      , Source
                      , SourceSpan
@@ -50,58 +54,94 @@ library
                      , Term
                      , Term.Arbitrary
                      , TreeSitter
-                     , DiffSummary
-                     , Prologue
-                     , Paths_semantic_diff
-  build-depends:       aeson
-                     , base >= 4.8 && < 5
+  build-depends:       base >= 4.8 && < 5
+                     , aeson
+                     , async-pool
                      , bifunctors
                      , blaze-html
                      , blaze-markup
                      , bytestring
                      , cmark
+                     , comonad
                      , containers
                      , directory
                      , dlist
                      , filepath
+                     , free
+                     , gitlib
+                     , gitlib-libgit2
+                     , gitrev
                      , hashable
                      , kdt
-                     , mtl
                      , MonadRandom
+                     , mtl
+                     , optparse-applicative
                      , pointed
+                     , protolude
                      , QuickCheck >= 2.8.1
+                     , quickcheck-instances
                      , quickcheck-text
+                     , recursion-schemes
+                     , regex-compat
                      , semigroups
                      , text >= 1.2.1.3
                      , text-icu
                      , these
                      , tree-sitter-parsers
                      , vector
-                     , recursion-schemes
-                     , free
-                     , comonad
-                     , protolude
                      , wl-pprint-text
-                     , quickcheck-instances
   default-language:    Haskell2010
   default-extensions:  DeriveFunctor, DeriveFoldable, DeriveTraversable, DeriveGeneric, FlexibleContexts, FlexibleInstances, OverloadedStrings, NoImplicitPrelude, RecordWildCards, LambdaCase
   ghc-options:        -Wall -fno-warn-name-shadowing -O2 -fprof-auto -j
 
+executable semantic-diff
+  hs-source-dirs:      app
+  main-is:             Main.hs
+  ghc-options:       -threaded -rtsopts -with-rtsopts=-N -static -j -O2 -pgml=script/g++
+  cc-options:          -DU_STATIC_IMPLEMENTATION=1
+  cpp-options:         -DU_STATIC_IMPLEMENTATION=1
+  build-depends:       base
+                     , semantic-diff
+  default-language:    Haskell2010
+  default-extensions:  FlexibleInstances, OverloadedStrings, NoImplicitPrelude, RecordWildCards
+
+executable generate-test-cases
+  hs-source-dirs:      app, test
+  main-is:             GenerateTestCases.hs
+  ghc-options:       -threaded -rtsopts -with-rtsopts=-N -static -j -pgml=script/g++
+  cc-options:          -DU_STATIC_IMPLEMENTATION=1
+  cpp-options:         -DU_STATIC_IMPLEMENTATION=1
+  other-modules:       JSONTestCase
+  build-depends:       base
+                     , aeson
+                     , aeson-pretty
+                     , bytestring
+                     , containers
+                     , Glob
+                     , MissingH
+                     , optparse-applicative
+                     , process
+                     , semantic-diff
+                     , text >= 1.2.1.3
+  default-language:    Haskell2010
+  default-extensions:  DeriveFunctor, DeriveFoldable, DeriveTraversable, DeriveGeneric, FlexibleContexts, FlexibleInstances, OverloadedStrings, NoImplicitPrelude, RecordWildCards, LambdaCase
+
 benchmark semantic-diff-bench
   type:                exitcode-stdio-1.0
   main-is:             Main.hs
   hs-source-dirs:      bench
+  other-modules:       SemanticDiffPar
   build-depends:       base
-                     , bifunctors
                      , criterion
+                     , directory
+                     , monad-par
+                     , mtl
                      , QuickCheck >= 2.8.1
-                     , quickcheck-text
-                     , recursion-schemes
                      , semantic-diff
-                     , these
+                     , text >= 1.2.1.3
   ghc-options:       -threaded -rtsopts -with-rtsopts=-N -j -O2 -static -pgml=script/g++
   default-language:    Haskell2010
-  default-extensions:  OverloadedStrings, NoImplicitPrelude
+  default-extensions:  FlexibleInstances, OverloadedStrings, NoImplicitPrelude, RecordWildCards
 
 test-suite test
   type:                exitcode-stdio-1.0
@@ -120,15 +160,13 @@ test-suite test
                      , TermSpec
   build-depends:       base
                      , bifunctors
-                     , bytestring
-                     , containers
                      , deepseq
-                     , dlist
                      , filepath
-                     , free
                      , Glob
                      , hspec >= 2.1.10
+                     , hspec-expectations-pretty-diff
                      , mtl
+                     , protolude
                      , QuickCheck >= 2.8.1
                      , quickcheck-text
                      , recursion-schemes >= 4.1
@@ -136,13 +174,28 @@ test-suite test
                      , text >= 1.2.1.3
                      , these
                      , vector
-                     , wl-pprint-text
-                     , protolude
-                     , hspec-expectations-pretty-diff
   ghc-options:       -threaded -rtsopts -with-rtsopts=-N -j -pgml=script/g++
   default-language:    Haskell2010
   default-extensions:  DeriveFunctor, DeriveGeneric, FlexibleContexts, FlexibleInstances, OverloadedStrings, NoImplicitPrelude, RecordWildCards
 
+test-suite integration-test
+  type:                exitcode-stdio-1.0
+  hs-source-dirs:      test
+  main-is:             SpecIntegration.hs
+  other-modules:       SemanticGitDiffSpec
+                     , JSONTestCase
+  build-depends:       base
+                     , aeson
+                     , bytestring
+                     , containers
+                     , Glob
+                     , hspec >= 2.1.10
+                     , hspec-expectations-pretty-diff
+                     , semantic-diff
+  ghc-options:       -threaded -rtsopts -with-rtsopts=-N -j -pgml=script/g++
+  default-language:    Haskell2010
+  default-extensions:  DeriveGeneric, FlexibleInstances, OverloadedStrings, NoImplicitPrelude, RecordWildCards
+
 source-repository head
   type:     git
   location: https://github.com/github/semantic-diff

src/DiffSummary.hs

@@ -149,8 +149,7 @@ toLeafInfos err@ErrorInfo{..} = pure $ ErrorSummary (pretty err) errorSpan
 -- Returns a text representing a specific term given a source and a term.
 toTermName :: forall leaf fields. (HasCategory leaf, HasField fields Category, HasField fields Range) => Source Char -> SyntaxTerm leaf fields -> Text
 toTermName source term = case unwrap term of
-  S.AnonymousFunction maybeParams _ -> "anonymous" <> maybe "" toParams maybeParams <> " function"
-    where toParams ps = " (" <> termNameFromSource ps <> ")"
+  S.AnonymousFunction params _ -> "anonymous" <> paramsToArgNames params <> " function"
   S.Fixed children -> fromMaybe "branch" $ (toCategoryName . category) . extract <$> head children
   S.Indexed children -> fromMaybe "branch" $ (toCategoryName . category) . extract <$> head children
   Leaf leaf -> toCategoryName leaf
@@ -162,7 +161,7 @@ toTermName source term = case unwrap term of
     (S.FunctionCall{}, _) -> toTermName' base <> "()." <> toTermName' property
     (_, S.FunctionCall{}) -> toTermName' base <> "." <> toTermName' property <> "()"
     (_, _) -> toTermName' base <> "." <> toTermName' property
-  S.MethodCall targetId methodId methodParams -> toTermName' targetId <> sep <> toTermName' methodId <> "(" <> intercalate ", " (toArgName <$> methodParams) <> ")"
+  S.MethodCall targetId methodId methodParams -> toTermName' targetId <> sep <> toTermName' methodId <> paramsToArgNames methodParams
     where sep = case unwrap targetId of
             S.FunctionCall{} -> "()."
             _ -> "."
@@ -205,6 +204,7 @@ toTermName source term = case unwrap term of
         termNameFromSource term = termNameFromRange (range term)
         termNameFromRange range = toText $ Source.slice range source
         range = characterRange . extract
+        paramsToArgNames params = "(" <> intercalate ", " (toArgName <$> params) <> ")"
         toArgName :: SyntaxTerm leaf fields -> Text
         toArgName arg = case identifiable arg of
                           Identifiable arg -> toTermName' arg

src/Language/JavaScript.hs

@@ -69,11 +69,9 @@ termConstructor source sourceSpan name range children
     _ | name `elem` forStatements, Just (exprs, body) <- unsnoc children -> S.For exprs body
     _ | name `elem` operators -> S.Operator children
     _ | name `elem` functions -> case children of
-          [ body ] -> S.AnonymousFunction Nothing body
-          [ idOrParams, body] -> case unwrap idOrParams of
-            S.Leaf _ -> S.Function idOrParams Nothing body
-            _ -> S.AnonymousFunction (Just idOrParams) body
-          [ id, params, body ] -> S.Function id (Just params) body
+          [ body ] -> S.AnonymousFunction [] body
+          [ params, body ] -> S.AnonymousFunction (toList (unwrap params)) body
+          [ id, params, body ] -> S.Function id (toList (unwrap params)) body
           _ -> S.Indexed children
     (_, []) -> S.Leaf . toText $ slice range source
     _ -> S.Indexed children

src/SemanticDiff.hs

@@ -0,0 +1,156 @@
+{-# LANGUAGE TemplateHaskell #-}
+{-# OPTIONS_GHC -fno-warn-warnings-deprecations -fno-warn-incomplete-patterns #-}
+module SemanticDiff (main, fetchDiff, fetchDiffs) where
+
+import Arguments
+import Prologue hiding ((<>), fst, snd)
+import Data.String
+import Data.Functor.Both
+import Data.Version (showVersion)
+import Text.Regex
+import Diffing
+import Git.Libgit2
+import Git.Repository
+import Git.Blob
+import Git.Types
+import Git.Libgit2.Backend
+import Options.Applicative hiding (action)
+import System.Timeout as Timeout
+import Data.List ((\\))
+import qualified Diffing as D
+import qualified Git
+import qualified Paths_semantic_diff as Library (version)
+import qualified Renderer as R
+import qualified Source
+import qualified Control.Concurrent.Async.Pool as Async
+import GHC.Conc (numCapabilities)
+import Development.GitRev
+
+main :: IO ()
+main = do
+  args@Arguments{..} <- programArguments =<< execParser argumentsParser
+  case diffMode of
+    PathDiff paths -> diffPaths args paths
+    CommitDiff -> diffCommits args
+
+-- | A parser for the application's command-line arguments.
+argumentsParser :: ParserInfo CmdLineOptions
+argumentsParser = info (version <*> helper <*> argumentsP)
+                       (fullDesc <> progDesc "Set the GIT_DIR environment variable to specify the git repository. Set GIT_ALTERNATE_OBJECT_DIRECTORIES to specify location of alternates."
+                                 <> header "semantic-diff - Show semantic changes between commits")
+  where
+    argumentsP :: Parser CmdLineOptions
+    argumentsP = CmdLineOptions
+      <$> (flag R.Split R.Patch (long "patch" <> help "output a patch(1)-compatible diff")
+      <|> flag R.Split R.JSON (long "json" <> help "output a json diff")
+      <|> flag' R.Split (long "split" <> help "output a split diff")
+      <|> flag' R.Summary (long "summary" <> help "output a diff summary"))
+      <*> optional (option auto (long "timeout" <> help "timeout for per-file diffs in seconds, defaults to 7 seconds"))
+      <*> optional (strOption (long "output" <> short 'o' <> help "output directory for split diffs, defaults to stdout if unspecified"))
+      <*> switch (long "no-index" <> help "compare two paths on the filesystem")
+      <*> some (argument (eitherReader parseShasAndFiles) (metavar "SHA_A..SHAB FILES..."))
+      where
+        parseShasAndFiles :: String -> Either String ExtraArg
+        parseShasAndFiles s = case matchRegex regex s of
+          Just ["", sha2] -> Right . ShaPair $ both Nothing (Just sha2)
+          Just [sha1, sha2] -> Right . ShaPair $ Just <$> both sha1 sha2
+          _ -> Right $ FileArg s
+          where regex = mkRegexWithOpts "([0-9a-f]{40})\\.\\.([0-9a-f]{40})" True False
+
+versionString :: String
+versionString = "semantic-diff version " <> showVersion Library.version <> " (" <> $(gitHash) <> ")"
+
+version :: Parser (a -> a)
+version = infoOption versionString (long "version" <> short 'V' <> help "output the version of the program")
+
+-- | Compare changes between two commits.
+diffCommits :: Arguments -> IO ()
+diffCommits args@Arguments{..} = do
+  ts <- Timeout.timeout timeoutInMicroseconds (fetchDiffs args)
+  writeToOutput output (maybe mempty R.concatOutputs ts)
+
+-- | Compare two paths on the filesystem (compariable to git diff --no-index).
+diffPaths :: Arguments -> Both FilePath -> IO ()
+diffPaths args@Arguments{..} paths = do
+  sources <- sequence $ readAndTranscodeFile <$> paths
+  let sourceBlobs = Source.SourceBlob <$> sources <*> pure mempty <*> paths <*> pure (Just Source.defaultPlainBlob)
+  D.printDiff (parserForFilepath (fst paths)) (diffArgs args) sourceBlobs
+  where
+    diffArgs Arguments{..} = R.DiffArguments { format = format, output = output }
+
+fetchDiffs :: Arguments -> IO [R.Output]
+fetchDiffs args@Arguments{..} = do
+  paths <- case(filePaths, shaRange) of
+    ([], Join (Just a, Just b)) -> pathsToDiff args (both a b)
+    (ps, _) -> pure ps
+
+  Async.withTaskGroup numCapabilities $ \p ->
+    Async.mapTasks p (fetchDiff args <$> paths)
+
+fetchDiff :: Arguments -> FilePath -> IO R.Output
+fetchDiff args@Arguments{..} filepath = withRepository lgFactory gitDir $ do
+  repo <- getRepository
+  for_ alternateObjectDirs (liftIO . odbBackendAddPath repo . toS)
+  lift $ runReaderT (fetchDiff' args filepath) repo
+
+fetchDiff' :: Arguments -> FilePath -> ReaderT LgRepo IO R.Output
+fetchDiff' Arguments{..} filepath = do
+  sourcesAndOids <- sequence $ traverse (getSourceBlob filepath) <$> shaRange
+
+  let sources = fromMaybe (Source.emptySourceBlob filepath) <$> sourcesAndOids
+  let sourceBlobs = Source.idOrEmptySourceBlob <$> sources
+
+  let textDiff = D.textDiff (parserForFilepath filepath) diffArguments sourceBlobs
+  text <- liftIO $ Timeout.timeout timeoutInMicroseconds textDiff
+
+  truncatedPatch <- liftIO $ D.truncatedDiff diffArguments sourceBlobs
+  pure $ fromMaybe truncatedPatch text
+  where
+    diffArguments = R.DiffArguments { format = format, output = output }
+
+pathsToDiff :: Arguments -> Both String -> IO [FilePath]
+pathsToDiff Arguments{..} shas = withRepository lgFactory gitDir $ do
+  repo <- getRepository
+  for_ alternateObjectDirs (liftIO . odbBackendAddPath repo . toS)
+  lift $ runReaderT (pathsToDiff' shas) repo
+
+-- | Returns a list of relative file paths that have changed between the given commit shas.
+pathsToDiff' :: Both String -> ReaderT LgRepo IO [FilePath]
+pathsToDiff' shas = do
+  entries <- blobEntriesToDiff shas
+  pure $ (\(p, _, _) -> toS p) <$> entries
+
+-- | Returns a list of blob entries that have changed between the given commits shas.
+blobEntriesToDiff :: Both String -> ReaderT LgRepo IO [(TreeFilePath, Git.BlobOid LgRepo, BlobKind)]
+blobEntriesToDiff shas = do
+  a <- blobEntries (fst shas)
+  b <- blobEntries (snd shas)
+  pure $ (a \\ b) <> (b \\ a)
+  where blobEntries sha = treeForCommitSha sha >>= treeBlobEntries
+
+-- | Returns a Git.Tree for a commit sha
+treeForCommitSha :: String -> ReaderT LgRepo IO (Git.Tree LgRepo)
+treeForCommitSha sha = do
+  object <- parseObjOid (toS sha)
+  commit <- lookupCommit object
+  lookupTree (commitTree commit)
+
+-- | Returns a SourceBlob given a relative file path, and the sha to look up.
+getSourceBlob :: FilePath -> String -> ReaderT LgRepo IO Source.SourceBlob
+getSourceBlob path sha = do
+  tree <- treeForCommitSha sha
+  entry <- treeEntry tree (toS path)
+  (bytestring, oid, mode) <- case entry of
+    Nothing -> pure (mempty, mempty, Nothing)
+    Just (BlobEntry entryOid entryKind) -> do
+      blob <- lookupBlob entryOid
+      let (BlobString s) = blobContents blob
+      let oid = renderObjOid $ blobOid blob
+      pure (s, oid, Just entryKind)
+  s <- liftIO $ transcode bytestring
+  pure $ Source.SourceBlob s (toS oid) path (toSourceKind <$> mode)
+  where
+    toSourceKind :: Git.BlobKind -> Source.SourceKind
+    toSourceKind (Git.PlainBlob mode) = Source.PlainBlob mode
+    toSourceKind (Git.ExecutableBlob mode) = Source.ExecutableBlob mode
+    toSourceKind (Git.SymlinkBlob mode) = Source.SymlinkBlob mode

src/Syntax.hs

@@ -22,9 +22,9 @@ data Syntax a f
   -- | A ternary has a condition, a true case and a false case
   | Ternary { ternaryCondition :: f, ternaryCases :: [f] }
   -- | An anonymous function has a list of expressions and params.
-  | AnonymousFunction { params :: Maybe f, expressions :: f }
+  | AnonymousFunction { params :: [f], expressions :: f }
   -- | A function has a list of expressions.
-  | Function { id :: f, params :: Maybe f, expressions :: f }
+  | Function { id :: f, params :: [f], expressions :: f }
   -- | An assignment has an identifier where f can be a member access, and the value is another syntax element (function call, leaf, etc.)
   | Assignment { assignmentId :: f, value :: f }
   -- | A math assignment represents expressions whose operator classifies as mathy (e.g. += or *=).

src/TreeSitter.hs

@@ -21,7 +21,7 @@ import Info
 -- | Returns a TreeSitter parser for the given language and TreeSitter grammar.
 treeSitterParser :: Language -> Ptr TS.Language -> Parser (Syntax.Syntax Text) (Record '[Range, Category, SourceSpan])
 treeSitterParser language grammar blob = do
-  document <- ts_document_make
+  document <- ts_document_new
   ts_document_set_language document grammar
   withCString (toString $ source blob) (\source -> do
     ts_document_set_input_string document source

test/JSONTestCase.hs

@@ -0,0 +1,31 @@
+{-# LANGUAGE DeriveAnyClass #-}
+module JSONTestCase where
+
+import Data.Map.Strict as Map
+import Prelude
+import Prologue
+import Data.Aeson
+
+data JSONMetaRepo = JSONMetaRepo { repoPath :: !String
+                                 , repoUrl :: !String
+                                 , language :: !String
+                                 , syntaxes :: ![JSONMetaSyntax]
+                                 } deriving (Show, Generic, FromJSON)
+
+data JSONMetaSyntax = JSONMetaSyntax { syntax :: !String
+                                     , repoFilePath :: !String
+                                     , testCaseFilePath :: !String
+                                     , insert :: !String
+                                     , replacement :: !String
+                                     } deriving (Show, Generic, FromJSON)
+
+data JSONTestCase = JSONTestCase { gitDir :: !String
+                                 , testCaseDescription :: !String
+                                 , filePaths :: ![String]
+                                 , sha1 :: !String
+                                 , sha2 :: !String
+                                 , expectedResult :: !(Map Text (Map Text [Value]))
+                                 } deriving (Show, Generic, FromJSON)
+
+instance ToJSON JSONTestCase where
+  toEncoding = genericToEncoding defaultOptions

test/SemanticGitDiffSpec.hs

@@ -0,0 +1,53 @@
+module SemanticGitDiffSpec where
+
+import Arguments
+import Data.Aeson
+import Data.Map.Strict as Map
+import Control.Exception
+import qualified Data.ByteString.Lazy as DL
+import JSONTestCase
+import Test.Hspec (Spec, describe, it, SpecWith, runIO, parallel)
+import Prelude
+import Prologue
+import Renderer
+import SemanticDiff
+import System.FilePath.Glob
+import Data.Maybe (fromJust)
+import Test.Hspec.Expectations.Pretty
+
+catchException :: IO [Text] -> IO [Text]
+catchException = handle errorHandler
+  where errorHandler :: (SomeException -> IO [Text])
+        errorHandler exception = return [toS . encode $ ["Crashed: " <> Prologue.show exception :: Text]]
+
+assertDiffSummary :: JSONTestCase -> Format -> (Either String (Map Text (Map Text [Value])) -> Either String (Map Text (Map Text [Value])) -> Expectation) -> Expectation
+assertDiffSummary JSONTestCase {..} format matcher = do
+  diffs <- fetchDiffs $ args gitDir sha1 sha2 filePaths format
+  result <- catchException . pure . pure . concatOutputs $ diffs
+  let actual = eitherDecode . DL.fromStrict . encodeUtf8 . fromJust $ listToMaybe result
+  matcher actual (Right expectedResult)
+
+runTestsIn :: [FilePath] -> Format -> (Either String (Map Text (Map Text [Value])) -> Either String (Map Text (Map Text [Value])) -> Expectation) -> SpecWith ()
+runTestsIn filePaths format matcher = do
+  contents <- runIO $ traverse DL.readFile filePaths
+  let filePathContents = zip filePaths contents
+  let jsonContents = (\(filePath, content) -> (filePath, eitherDecode content)) <$> filePathContents :: [(FilePath, Either String [JSONTestCase])]
+  traverse_ handleJSONTestCase jsonContents
+  where handleJSONTestCase :: (FilePath, Either String [JSONTestCase]) -> SpecWith ()
+        handleJSONTestCase (filePath, eitherJSONTestCase) =
+          case eitherJSONTestCase of
+            Left err ->  it ("An error occurred " <> err <> " (" <> filePath <> ")") $ True `shouldBe` False
+            Right testCases -> traverse_ (\testCase -> it (testCaseDescription testCase) $ assertDiffSummary testCase format matcher) testCases
+
+spec :: Spec
+spec = parallel $ do
+  diffSummaryFiles <- runIO $ testCaseFiles "test/corpus/diff-summaries"
+  diffSummaryToDoFiles <- runIO $ testCaseFiles "test/corpus/diff-summaries-todo"
+  diffSummaryCrasherFiles <- runIO $ testCaseFiles "test/corpus/diff-summary-crashers"
+
+  describe "diff summaries" $ runTestsIn diffSummaryFiles Summary shouldBe
+  describe "diff summaries todo" $ runTestsIn diffSummaryToDoFiles Summary shouldNotBe
+  describe "diff summaries crashers todo" $ runTestsIn diffSummaryCrasherFiles Summary shouldBe
+
+  where testCaseFiles :: String -> IO [FilePath]
+        testCaseFiles = globDir1 (compile "*/*.json")

test/SpecIntegration.hs

@@ -0,0 +1,9 @@
+module Main where
+
+import Prologue
+import qualified SemanticGitDiffSpec
+import Test.Hspec
+
+main :: IO ()
+main = hspec $ parallel $ do
+  describe "DiffSummaries" SemanticGitDiffSpec.spec

test/corpus/diff-summaries-todo/javascript/boolean-operator.json

@@ -0,0 +1,30 @@
+[{
+    "testCaseDescription": "javascript-boolean-operator-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "boolean-operator.js": [ "Added the 'i || j' binary operator", "Deleted the 'i && j' binary operator" ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "boolean-operator.js"
+    ],
+    "sha1": "c57d91166c3246b8e352252024dc21de6a42f707",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "244097ce5a74d6275f249d5159a6a14696a1eddf"
+}
+,{
+    "testCaseDescription": "javascript-boolean-operator-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "boolean-operator.js": [ "Added the 'i && j' binary operator", "Deleted the 'i || j' binary operator" ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "boolean-operator.js"
+    ],
+    "sha1": "244097ce5a74d6275f249d5159a6a14696a1eddf",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "0abfc815d9c5912259cfc25becb398a8f1444d40"
+}]

test/corpus/diff-summaries-todo/javascript/relational-operator.json

@@ -0,0 +1,30 @@
+[{
+    "testCaseDescription": "javascript-relational-operator-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "relational-operator.js": [ "Added the 'x < y' relational operator","Deleted the 'x <= y' relational operator" ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "relational-operator.js"
+    ],
+    "sha1": "f79a619c0277b82bb45cb1510847b78ba44ea31b",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "1fc7441b1fb64b171cf7892e3ce25bc55e25d754"
+}
+,{
+    "testCaseDescription": "javascript-relational-operator-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "relational-operator.js": [ "Added the 'x <= y' relational operator","Deleted the 'x < y' relational operator" ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "relational-operator.js"
+    ],
+    "sha1": "1fc7441b1fb64b171cf7892e3ce25bc55e25d754",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "e1d768da1e35b8066276dc5b5f9653442345948d"
+}]

test/corpus/diff-summaries/javascript/anonymous-function.json

@@ -0,0 +1,488 @@
+[{
+    "testCaseDescription": "javascript-anonymous-function-insert-test",
+    "expectedResult": {
+        "changes": {
+            "anonymous-function.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "anonymous-function.js",
+                            "end": [
+                                1,
+                                32
+                            ]
+                        }
+                    },
+                    "summary": "Added an anonymous(a, b) function",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "anonymous-function.js"
+    ],
+    "sha1": "4e616c4976a8cc24c20fda3c6bfcde4cfa22483f",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "11adb5f79753721a4cb9dd4c953f9baa21da78e4"
+}
+,{
+    "testCaseDescription": "javascript-anonymous-function-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "anonymous-function.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "anonymous-function.js",
+                            "end": [
+                                1,
+                                32
+                            ]
+                        }
+                    },
+                    "summary": "Added an anonymous(b, c) function",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "anonymous-function.js",
+                            "end": [
+                                2,
+                                32
+                            ]
+                        }
+                    },
+                    "summary": "Added an anonymous(a, b) function",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "anonymous-function.js"
+    ],
+    "sha1": "11adb5f79753721a4cb9dd4c953f9baa21da78e4",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "22aa5c90ae1f387ad7f6fd2169bb97f5d3c57446"
+}
+,{
+    "testCaseDescription": "javascript-anonymous-function-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "anonymous-function.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    10
+                                ],
+                                "name": "anonymous-function.js",
+                                "end": [
+                                    1,
+                                    11
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    10
+                                ],
+                                "name": "anonymous-function.js",
+                                "end": [
+                                    1,
+                                    11
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'b' identifier with the 'a' identifier",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    12
+                                ],
+                                "name": "anonymous-function.js",
+                                "end": [
+                                    1,
+                                    13
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    12
+                                ],
+                                "name": "anonymous-function.js",
+                                "end": [
+                                    1,
+                                    13
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'c' identifier with the 'b' identifier",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    24
+                                ],
+                                "name": "anonymous-function.js",
+                                "end": [
+                                    1,
+                                    25
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    24
+                                ],
+                                "name": "anonymous-function.js",
+                                "end": [
+                                    1,
+                                    25
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'b' identifier with the 'a' identifier",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    28
+                                ],
+                                "name": "anonymous-function.js",
+                                "end": [
+                                    1,
+                                    29
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    28
+                                ],
+                                "name": "anonymous-function.js",
+                                "end": [
+                                    1,
+                                    29
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'c' identifier with the 'b' identifier",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "anonymous-function.js"
+    ],
+    "sha1": "22aa5c90ae1f387ad7f6fd2169bb97f5d3c57446",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "00641b36f04df3262046fb678d56334975197898"
+}
+,{
+    "testCaseDescription": "javascript-anonymous-function-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "anonymous-function.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    10
+                                ],
+                                "name": "anonymous-function.js",
+                                "end": [
+                                    1,
+                                    11
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    10
+                                ],
+                                "name": "anonymous-function.js",
+                                "end": [
+                                    1,
+                                    11
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'a' identifier with the 'b' identifier",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    12
+                                ],
+                                "name": "anonymous-function.js",
+                                "end": [
+                                    1,
+                                    13
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    12
+                                ],
+                                "name": "anonymous-function.js",
+                                "end": [
+                                    1,
+                                    13
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'b' identifier with the 'c' identifier",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    24
+                                ],
+                                "name": "anonymous-function.js",
+                                "end": [
+                                    1,
+                                    25
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    24
+                                ],
+                                "name": "anonymous-function.js",
+                                "end": [
+                                    1,
+                                    25
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'a' identifier with the 'b' identifier",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    28
+                                ],
+                                "name": "anonymous-function.js",
+                                "end": [
+                                    1,
+                                    29
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    28
+                                ],
+                                "name": "anonymous-function.js",
+                                "end": [
+                                    1,
+                                    29
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'b' identifier with the 'c' identifier",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "anonymous-function.js"
+    ],
+    "sha1": "00641b36f04df3262046fb678d56334975197898",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "5005a8366ec0cd60cb0d36c5b8e70573ab05b5e2"
+}
+,{
+    "testCaseDescription": "javascript-anonymous-function-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "anonymous-function.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "anonymous-function.js",
+                            "end": [
+                                1,
+                                32
+                            ]
+                        }
+                    },
+                    "summary": "Deleted an anonymous(b, c) function",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "anonymous-function.js",
+                            "end": [
+                                2,
+                                32
+                            ]
+                        }
+                    },
+                    "summary": "Deleted an anonymous(a, b) function",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "anonymous-function.js",
+                            "end": [
+                                2,
+                                32
+                            ]
+                        }
+                    },
+                    "summary": "Added an anonymous(b, c) function",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "anonymous-function.js"
+    ],
+    "sha1": "5005a8366ec0cd60cb0d36c5b8e70573ab05b5e2",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "1356b34dcce5152406f29f015d8342982a3704e4"
+}
+,{
+    "testCaseDescription": "javascript-anonymous-function-delete-test",
+    "expectedResult": {
+        "changes": {
+            "anonymous-function.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "anonymous-function.js",
+                            "end": [
+                                1,
+                                32
+                            ]
+                        }
+                    },
+                    "summary": "Deleted an anonymous(a, b) function",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "anonymous-function.js"
+    ],
+    "sha1": "1356b34dcce5152406f29f015d8342982a3704e4",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "22d5b6e950763c553f1efb105400c69ab6f34b31"
+}
+,{
+    "testCaseDescription": "javascript-anonymous-function-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "anonymous-function.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "anonymous-function.js",
+                            "end": [
+                                1,
+                                32
+                            ]
+                        }
+                    },
+                    "summary": "Deleted an anonymous(b, c) function",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "anonymous-function.js"
+    ],
+    "sha1": "22d5b6e950763c553f1efb105400c69ab6f34b31",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "d03e64156e1eccacaee03b2180ecdeba6ca0385c"
+}]

test/corpus/diff-summaries/javascript/anonymous-parameterless-function.json

@@ -0,0 +1,308 @@
+[{
+    "testCaseDescription": "javascript-anonymous-parameterless-function-insert-test",
+    "expectedResult": {
+        "changes": {
+            "anonymous-parameterless-function.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "anonymous-parameterless-function.js",
+                            "end": [
+                                1,
+                                28
+                            ]
+                        }
+                    },
+                    "summary": "Added an anonymous() function",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "anonymous-parameterless-function.js"
+    ],
+    "sha1": "d03e64156e1eccacaee03b2180ecdeba6ca0385c",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "74ca1b76b63e514abaf450801b7c266a075d88cf"
+}
+,{
+    "testCaseDescription": "javascript-anonymous-parameterless-function-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "anonymous-parameterless-function.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "anonymous-parameterless-function.js",
+                            "end": [
+                                1,
+                                31
+                            ]
+                        }
+                    },
+                    "summary": "Added an anonymous() function",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "anonymous-parameterless-function.js",
+                            "end": [
+                                2,
+                                28
+                            ]
+                        }
+                    },
+                    "summary": "Added an anonymous() function",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "anonymous-parameterless-function.js"
+    ],
+    "sha1": "74ca1b76b63e514abaf450801b7c266a075d88cf",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "dbe1defa8484a6fe83354587d0c2d694d53d85d7"
+}
+,{
+    "testCaseDescription": "javascript-anonymous-parameterless-function-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "anonymous-parameterless-function.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    21
+                                ],
+                                "name": "anonymous-parameterless-function.js",
+                                "end": [
+                                    1,
+                                    28
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    21
+                                ],
+                                "name": "anonymous-parameterless-function.js",
+                                "end": [
+                                    1,
+                                    25
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'hello' string with the 'hi' string",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "anonymous-parameterless-function.js"
+    ],
+    "sha1": "dbe1defa8484a6fe83354587d0c2d694d53d85d7",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "ebe1b4c63b69969ba5879d11d968a450a4764320"
+}
+,{
+    "testCaseDescription": "javascript-anonymous-parameterless-function-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "anonymous-parameterless-function.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    21
+                                ],
+                                "name": "anonymous-parameterless-function.js",
+                                "end": [
+                                    1,
+                                    25
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    21
+                                ],
+                                "name": "anonymous-parameterless-function.js",
+                                "end": [
+                                    1,
+                                    28
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'hi' string with the 'hello' string",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "anonymous-parameterless-function.js"
+    ],
+    "sha1": "ebe1b4c63b69969ba5879d11d968a450a4764320",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "2f5c02d12967641470fcd29a06d32300cecc578b"
+}
+,{
+    "testCaseDescription": "javascript-anonymous-parameterless-function-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "anonymous-parameterless-function.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "anonymous-parameterless-function.js",
+                            "end": [
+                                1,
+                                31
+                            ]
+                        }
+                    },
+                    "summary": "Deleted an anonymous() function",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "anonymous-parameterless-function.js",
+                            "end": [
+                                2,
+                                28
+                            ]
+                        }
+                    },
+                    "summary": "Deleted an anonymous() function",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "anonymous-parameterless-function.js",
+                            "end": [
+                                2,
+                                31
+                            ]
+                        }
+                    },
+                    "summary": "Added an anonymous() function",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "anonymous-parameterless-function.js"
+    ],
+    "sha1": "2f5c02d12967641470fcd29a06d32300cecc578b",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "07dbb53e127cb5de0e07c6f449d2959038088696"
+}
+,{
+    "testCaseDescription": "javascript-anonymous-parameterless-function-delete-test",
+    "expectedResult": {
+        "changes": {
+            "anonymous-parameterless-function.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "anonymous-parameterless-function.js",
+                            "end": [
+                                1,
+                                28
+                            ]
+                        }
+                    },
+                    "summary": "Deleted an anonymous() function",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "anonymous-parameterless-function.js"
+    ],
+    "sha1": "07dbb53e127cb5de0e07c6f449d2959038088696",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "4d244392442a153a1495219111c1fa2929fae4ac"
+}
+,{
+    "testCaseDescription": "javascript-anonymous-parameterless-function-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "anonymous-parameterless-function.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "anonymous-parameterless-function.js",
+                            "end": [
+                                1,
+                                31
+                            ]
+                        }
+                    },
+                    "summary": "Deleted an anonymous() function",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "anonymous-parameterless-function.js"
+    ],
+    "sha1": "4d244392442a153a1495219111c1fa2929fae4ac",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "59872fcdcee9cd22104933bbc925d9987cd393b6"
+}]

test/corpus/diff-summaries/javascript/array.json

@@ -0,0 +1,282 @@
+[{
+    "testCaseDescription": "javascript-array-insert-test",
+    "expectedResult": {
+        "changes": {
+            "array.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "array.js",
+                            "end": [
+                                1,
+                                12
+                            ]
+                        }
+                    },
+                    "summary": "Added the '[ \"item1\" ]' array",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "array.js"
+    ],
+    "sha1": "72a672d52b6952c146edab2927b3b05abd022921",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "8a68989a0d6ab0cd555a73289acaf3ee5100c31d"
+}
+,{
+    "testCaseDescription": "javascript-array-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "array.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "array.js",
+                            "end": [
+                                1,
+                                21
+                            ]
+                        }
+                    },
+                    "summary": "Added the '[ \"item1\", \"item2\" ]' array",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "array.js",
+                            "end": [
+                                2,
+                                12
+                            ]
+                        }
+                    },
+                    "summary": "Added the '[ \"item1\" ]' array",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "array.js"
+    ],
+    "sha1": "8a68989a0d6ab0cd555a73289acaf3ee5100c31d",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "aba697e2f9d98d3f14f31cfe741d1c0150c3a99a"
+}
+,{
+    "testCaseDescription": "javascript-array-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "array.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                12
+                            ],
+                            "name": "array.js",
+                            "end": [
+                                1,
+                                19
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the \"item2\" string",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "array.js"
+    ],
+    "sha1": "aba697e2f9d98d3f14f31cfe741d1c0150c3a99a",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "7616278362cc2f6254d943d75632c5235bba9971"
+}
+,{
+    "testCaseDescription": "javascript-array-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "array.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                12
+                            ],
+                            "name": "array.js",
+                            "end": [
+                                1,
+                                19
+                            ]
+                        }
+                    },
+                    "summary": "Added the \"item2\" string",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "array.js"
+    ],
+    "sha1": "7616278362cc2f6254d943d75632c5235bba9971",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "44749342699a37f8ef292b98a3982097a3d08011"
+}
+,{
+    "testCaseDescription": "javascript-array-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "array.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "array.js",
+                            "end": [
+                                1,
+                                21
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the '[ \"item1\", \"item2\" ]' array",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "array.js",
+                            "end": [
+                                2,
+                                12
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the '[ \"item1\" ]' array",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "array.js",
+                            "end": [
+                                2,
+                                21
+                            ]
+                        }
+                    },
+                    "summary": "Added the '[ \"item1\", \"item2\" ]' array",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "array.js"
+    ],
+    "sha1": "44749342699a37f8ef292b98a3982097a3d08011",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "fe6708bd26fdab5406160bac05f1cff56de363f9"
+}
+,{
+    "testCaseDescription": "javascript-array-delete-test",
+    "expectedResult": {
+        "changes": {
+            "array.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "array.js",
+                            "end": [
+                                1,
+                                12
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the '[ \"item1\" ]' array",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "array.js"
+    ],
+    "sha1": "fe6708bd26fdab5406160bac05f1cff56de363f9",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "1e7aa51504a3eb084aaca63663658690ce3f65f0"
+}
+,{
+    "testCaseDescription": "javascript-array-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "array.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "array.js",
+                            "end": [
+                                1,
+                                21
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the '[ \"item1\", \"item2\" ]' array",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "array.js"
+    ],
+    "sha1": "1e7aa51504a3eb084aaca63663658690ce3f65f0",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "492ece78ac243f74d0f0bfce83c94b7162c1eaa6"
+}]

test/corpus/diff-summaries/javascript/arrow-function.json

@@ -0,0 +1,308 @@
+[{
+    "testCaseDescription": "javascript-arrow-function-insert-test",
+    "expectedResult": {
+        "changes": {
+            "arrow-function.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "arrow-function.js",
+                            "end": [
+                                1,
+                                24
+                            ]
+                        }
+                    },
+                    "summary": "Added an anonymous(f, g) function",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "arrow-function.js"
+    ],
+    "sha1": "142158e6e72a9a884b0d89c0b044b5c1473248db",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "13ec03f9e751e39a9264ab096a2340c206e46e94"
+}
+,{
+    "testCaseDescription": "javascript-arrow-function-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "arrow-function.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "arrow-function.js",
+                            "end": [
+                                1,
+                                24
+                            ]
+                        }
+                    },
+                    "summary": "Added an anonymous(f, g) function",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "arrow-function.js",
+                            "end": [
+                                2,
+                                24
+                            ]
+                        }
+                    },
+                    "summary": "Added an anonymous(f, g) function",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "arrow-function.js"
+    ],
+    "sha1": "13ec03f9e751e39a9264ab096a2340c206e46e94",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "5bed5bece02a8f7e16801c1e44d6b73af832e316"
+}
+,{
+    "testCaseDescription": "javascript-arrow-function-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "arrow-function.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    20
+                                ],
+                                "name": "arrow-function.js",
+                                "end": [
+                                    1,
+                                    21
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    20
+                                ],
+                                "name": "arrow-function.js",
+                                "end": [
+                                    1,
+                                    21
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'g' identifier with the 'h' identifier",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "arrow-function.js"
+    ],
+    "sha1": "5bed5bece02a8f7e16801c1e44d6b73af832e316",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "93d231ad655a0f193a27b6aed6e5daee14efb962"
+}
+,{
+    "testCaseDescription": "javascript-arrow-function-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "arrow-function.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    20
+                                ],
+                                "name": "arrow-function.js",
+                                "end": [
+                                    1,
+                                    21
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    20
+                                ],
+                                "name": "arrow-function.js",
+                                "end": [
+                                    1,
+                                    21
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'h' identifier with the 'g' identifier",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "arrow-function.js"
+    ],
+    "sha1": "93d231ad655a0f193a27b6aed6e5daee14efb962",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "bdf1809e96da6408d7fe4992cf0cb8b2617c283b"
+}
+,{
+    "testCaseDescription": "javascript-arrow-function-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "arrow-function.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "arrow-function.js",
+                            "end": [
+                                1,
+                                24
+                            ]
+                        }
+                    },
+                    "summary": "Deleted an anonymous(f, g) function",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "arrow-function.js",
+                            "end": [
+                                2,
+                                24
+                            ]
+                        }
+                    },
+                    "summary": "Deleted an anonymous(f, g) function",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "arrow-function.js",
+                            "end": [
+                                2,
+                                24
+                            ]
+                        }
+                    },
+                    "summary": "Added an anonymous(f, g) function",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "arrow-function.js"
+    ],
+    "sha1": "bdf1809e96da6408d7fe4992cf0cb8b2617c283b",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "47663edfd71e7dca4832c0c6981e05116a2ed347"
+}
+,{
+    "testCaseDescription": "javascript-arrow-function-delete-test",
+    "expectedResult": {
+        "changes": {
+            "arrow-function.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "arrow-function.js",
+                            "end": [
+                                1,
+                                24
+                            ]
+                        }
+                    },
+                    "summary": "Deleted an anonymous(f, g) function",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "arrow-function.js"
+    ],
+    "sha1": "47663edfd71e7dca4832c0c6981e05116a2ed347",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "89d1bae5033feb4a97fe91084db2a9b2faa48239"
+}
+,{
+    "testCaseDescription": "javascript-arrow-function-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "arrow-function.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "arrow-function.js",
+                            "end": [
+                                1,
+                                24
+                            ]
+                        }
+                    },
+                    "summary": "Deleted an anonymous(f, g) function",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "arrow-function.js"
+    ],
+    "sha1": "89d1bae5033feb4a97fe91084db2a9b2faa48239",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "304e0c432994c642daa18c284f4c1578416e77e1"
+}]

test/corpus/diff-summaries/javascript/assignment.json

@@ -0,0 +1,308 @@
+[{
+    "testCaseDescription": "javascript-assignment-insert-test",
+    "expectedResult": {
+        "changes": {
+            "assignment.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "assignment.js",
+                            "end": [
+                                1,
+                                6
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'x' assignment",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "assignment.js"
+    ],
+    "sha1": "e66aa2b6bacc2bbd796427540227b298518b1389",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "3956fb4eec4f0bd0a62f4e0b55ccaf0125576854"
+}
+,{
+    "testCaseDescription": "javascript-assignment-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "assignment.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "assignment.js",
+                            "end": [
+                                1,
+                                6
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'x' assignment",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "assignment.js",
+                            "end": [
+                                2,
+                                6
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'x' assignment",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "assignment.js"
+    ],
+    "sha1": "3956fb4eec4f0bd0a62f4e0b55ccaf0125576854",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "d1726bb6040b8c5f6358f7d1af2ebc11e7d96e9f"
+}
+,{
+    "testCaseDescription": "javascript-assignment-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "assignment.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    5
+                                ],
+                                "name": "assignment.js",
+                                "end": [
+                                    1,
+                                    6
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    5
+                                ],
+                                "name": "assignment.js",
+                                "end": [
+                                    1,
+                                    6
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced '1' with '0' in an assignment to x",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "assignment.js"
+    ],
+    "sha1": "d1726bb6040b8c5f6358f7d1af2ebc11e7d96e9f",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "01f04fbd4037191df6536ca1d542eb8f2678082d"
+}
+,{
+    "testCaseDescription": "javascript-assignment-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "assignment.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    5
+                                ],
+                                "name": "assignment.js",
+                                "end": [
+                                    1,
+                                    6
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    5
+                                ],
+                                "name": "assignment.js",
+                                "end": [
+                                    1,
+                                    6
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced '0' with '1' in an assignment to x",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "assignment.js"
+    ],
+    "sha1": "01f04fbd4037191df6536ca1d542eb8f2678082d",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "95e89035c2067fbcd267d77dfdd886961f91abeb"
+}
+,{
+    "testCaseDescription": "javascript-assignment-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "assignment.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "assignment.js",
+                            "end": [
+                                1,
+                                6
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'x' assignment",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "assignment.js",
+                            "end": [
+                                2,
+                                6
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'x' assignment",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "assignment.js",
+                            "end": [
+                                2,
+                                6
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'x' assignment",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "assignment.js"
+    ],
+    "sha1": "95e89035c2067fbcd267d77dfdd886961f91abeb",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "8faa9a17a52e98b1ad0f1162f486efdfda8f8e5c"
+}
+,{
+    "testCaseDescription": "javascript-assignment-delete-test",
+    "expectedResult": {
+        "changes": {
+            "assignment.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "assignment.js",
+                            "end": [
+                                1,
+                                6
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'x' assignment",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "assignment.js"
+    ],
+    "sha1": "8faa9a17a52e98b1ad0f1162f486efdfda8f8e5c",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "9032da30a2fccadbd1e19d8d0d0636948a92e1e3"
+}
+,{
+    "testCaseDescription": "javascript-assignment-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "assignment.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "assignment.js",
+                            "end": [
+                                1,
+                                6
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'x' assignment",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "assignment.js"
+    ],
+    "sha1": "9032da30a2fccadbd1e19d8d0d0636948a92e1e3",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "24ea895fcb8c904a8d057c536eb56be4a8928e33"
+}]

test/corpus/diff-summaries/javascript/bitwise-operator.json

@@ -0,0 +1,308 @@
+[{
+    "testCaseDescription": "javascript-bitwise-operator-insert-test",
+    "expectedResult": {
+        "changes": {
+            "bitwise-operator.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "bitwise-operator.js",
+                            "end": [
+                                1,
+                                7
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'i >> j' bitwise operator",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "bitwise-operator.js"
+    ],
+    "sha1": "e50fb0bfd581bcee25d02606b04bc985c4e8c2d5",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "ea02f16ab7419b380ec808099788e04be860b436"
+}
+,{
+    "testCaseDescription": "javascript-bitwise-operator-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "bitwise-operator.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "bitwise-operator.js",
+                            "end": [
+                                1,
+                                7
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'i >> k' bitwise operator",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "bitwise-operator.js",
+                            "end": [
+                                2,
+                                7
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'i >> j' bitwise operator",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "bitwise-operator.js"
+    ],
+    "sha1": "ea02f16ab7419b380ec808099788e04be860b436",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "f9001c917ef267da3f658296ca2acf5593d3782e"
+}
+,{
+    "testCaseDescription": "javascript-bitwise-operator-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "bitwise-operator.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    6
+                                ],
+                                "name": "bitwise-operator.js",
+                                "end": [
+                                    1,
+                                    7
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    6
+                                ],
+                                "name": "bitwise-operator.js",
+                                "end": [
+                                    1,
+                                    7
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'k' identifier with the 'j' identifier",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "bitwise-operator.js"
+    ],
+    "sha1": "f9001c917ef267da3f658296ca2acf5593d3782e",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "580bdafd78d48683a535d1da85a0f9810e776bca"
+}
+,{
+    "testCaseDescription": "javascript-bitwise-operator-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "bitwise-operator.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    6
+                                ],
+                                "name": "bitwise-operator.js",
+                                "end": [
+                                    1,
+                                    7
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    6
+                                ],
+                                "name": "bitwise-operator.js",
+                                "end": [
+                                    1,
+                                    7
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'j' identifier with the 'k' identifier",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "bitwise-operator.js"
+    ],
+    "sha1": "580bdafd78d48683a535d1da85a0f9810e776bca",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "3ca9b47b8791704f4d65314daf724c3ff3b77ad3"
+}
+,{
+    "testCaseDescription": "javascript-bitwise-operator-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "bitwise-operator.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "bitwise-operator.js",
+                            "end": [
+                                1,
+                                7
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'i >> k' bitwise operator",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "bitwise-operator.js",
+                            "end": [
+                                2,
+                                7
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'i >> j' bitwise operator",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "bitwise-operator.js",
+                            "end": [
+                                2,
+                                7
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'i >> k' bitwise operator",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "bitwise-operator.js"
+    ],
+    "sha1": "3ca9b47b8791704f4d65314daf724c3ff3b77ad3",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "74883181e363b757e7e66fa0e4fc525854b0ce1c"
+}
+,{
+    "testCaseDescription": "javascript-bitwise-operator-delete-test",
+    "expectedResult": {
+        "changes": {
+            "bitwise-operator.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "bitwise-operator.js",
+                            "end": [
+                                1,
+                                7
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'i >> j' bitwise operator",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "bitwise-operator.js"
+    ],
+    "sha1": "74883181e363b757e7e66fa0e4fc525854b0ce1c",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "3f724f4ce7be26db4a43de14aaefcec5c253c2f0"
+}
+,{
+    "testCaseDescription": "javascript-bitwise-operator-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "bitwise-operator.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "bitwise-operator.js",
+                            "end": [
+                                1,
+                                7
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'i >> k' bitwise operator",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "bitwise-operator.js"
+    ],
+    "sha1": "3f724f4ce7be26db4a43de14aaefcec5c253c2f0",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "8cdb0cc77bfe88b76c86dcde66d08f97f11182f3"
+}]

test/corpus/diff-summaries/javascript/boolean-operator.json

@@ -0,0 +1,208 @@
+[{
+    "testCaseDescription": "javascript-boolean-operator-insert-test",
+    "expectedResult": {
+        "changes": {
+            "boolean-operator.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "boolean-operator.js",
+                            "end": [
+                                1,
+                                7
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'i || j' boolean operator",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "boolean-operator.js"
+    ],
+    "sha1": "d7edfafd0028d88e036ad5af083bd4c0eaf821d5",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "c1fd7ccb58cd391d8a2cb427baf9451e6ef0734c"
+}
+,{
+    "testCaseDescription": "javascript-boolean-operator-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "boolean-operator.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "boolean-operator.js",
+                            "end": [
+                                1,
+                                7
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'i && j' boolean operator",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "boolean-operator.js",
+                            "end": [
+                                2,
+                                7
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'i || j' boolean operator",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "boolean-operator.js"
+    ],
+    "sha1": "c1fd7ccb58cd391d8a2cb427baf9451e6ef0734c",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "029b382cce42f0b823e8f6c7fa383b3236d7f831"
+}
+,{
+    "testCaseDescription": "javascript-boolean-operator-delete-insert-test",
+    "expectedResult": {
+        "changes": {},
+        "errors": {}
+    },
+    "filePaths": [
+        "boolean-operator.js"
+    ],
+    "sha1": "029b382cce42f0b823e8f6c7fa383b3236d7f831",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "8fef1ef2ddf9da13147ee48a19dd104f020b4f1d"
+}
+,{
+    "testCaseDescription": "javascript-boolean-operator-replacement-test",
+    "expectedResult": {
+        "changes": {},
+        "errors": {}
+    },
+    "filePaths": [
+        "boolean-operator.js"
+    ],
+    "sha1": "8fef1ef2ddf9da13147ee48a19dd104f020b4f1d",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "4f3d6544f9d7e379865cc08309dc7276695d864c"
+}
+,{
+    "testCaseDescription": "javascript-boolean-operator-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "boolean-operator.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "boolean-operator.js",
+                            "end": [
+                                1,
+                                7
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'i && j' boolean operator",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "boolean-operator.js"
+    ],
+    "sha1": "4f3d6544f9d7e379865cc08309dc7276695d864c",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "15041bb73bf8501e01192e57cfdd6f1d889776e9"
+}
+,{
+    "testCaseDescription": "javascript-boolean-operator-delete-test",
+    "expectedResult": {
+        "changes": {
+            "boolean-operator.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "boolean-operator.js",
+                            "end": [
+                                1,
+                                7
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'i || j' boolean operator",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "boolean-operator.js"
+    ],
+    "sha1": "15041bb73bf8501e01192e57cfdd6f1d889776e9",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "d5a15780faa29b2762f02eba66a6d4c4e3510b8f"
+}
+,{
+    "testCaseDescription": "javascript-boolean-operator-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "boolean-operator.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "boolean-operator.js",
+                            "end": [
+                                1,
+                                7
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'i && j' boolean operator",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "boolean-operator.js"
+    ],
+    "sha1": "d5a15780faa29b2762f02eba66a6d4c4e3510b8f",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "e50fb0bfd581bcee25d02606b04bc985c4e8c2d5"
+}]

test/corpus/diff-summaries/javascript/chained-callbacks.json

@@ -0,0 +1,428 @@
+[{
+    "testCaseDescription": "javascript-chained-callbacks-insert-test",
+    "expectedResult": {
+        "changes": {
+            "chained-callbacks.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "chained-callbacks.js",
+                            "end": [
+                                1,
+                                39
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'this.map(…)' method call",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "chained-callbacks.js"
+    ],
+    "sha1": "3717d88f796c52203c37c0d8440b823c78192c49",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "72ab8f58d72d44c1059e734e3a396d97eb072f23"
+}
+,{
+    "testCaseDescription": "javascript-chained-callbacks-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "chained-callbacks.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "chained-callbacks.js",
+                            "end": [
+                                1,
+                                42
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'this.reduce(…)' method call",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "chained-callbacks.js",
+                            "end": [
+                                2,
+                                39
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'this.map(…)' method call",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "chained-callbacks.js"
+    ],
+    "sha1": "72ab8f58d72d44c1059e734e3a396d97eb072f23",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "57f2199dba16641866f45c7554c0bbb5b912dc36"
+}
+,{
+    "testCaseDescription": "javascript-chained-callbacks-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "chained-callbacks.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    6
+                                ],
+                                "name": "chained-callbacks.js",
+                                "end": [
+                                    1,
+                                    12
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    6
+                                ],
+                                "name": "chained-callbacks.js",
+                                "end": [
+                                    1,
+                                    9
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'reduce' identifier with the 'map' identifier in the this.map(…) method call",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    35
+                                ],
+                                "name": "chained-callbacks.js",
+                                "end": [
+                                    1,
+                                    36
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    32
+                                ],
+                                "name": "chained-callbacks.js",
+                                "end": [
+                                    1,
+                                    33
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'b' identifier with the 'a' identifier in the this.map(…) method call",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    37
+                                ],
+                                "name": "chained-callbacks.js",
+                                "end": [
+                                    1,
+                                    38
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    34
+                                ],
+                                "name": "chained-callbacks.js",
+                                "end": [
+                                    1,
+                                    35
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'a' identifier with the 'b' identifier in the this.map(…) method call",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "chained-callbacks.js"
+    ],
+    "sha1": "57f2199dba16641866f45c7554c0bbb5b912dc36",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "d00c5e7da7eb6dfcdc63fa490b3e1f5c1481d41d"
+}
+,{
+    "testCaseDescription": "javascript-chained-callbacks-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "chained-callbacks.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    6
+                                ],
+                                "name": "chained-callbacks.js",
+                                "end": [
+                                    1,
+                                    9
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    6
+                                ],
+                                "name": "chained-callbacks.js",
+                                "end": [
+                                    1,
+                                    12
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'map' identifier with the 'reduce' identifier in the this.reduce(…) method call",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    32
+                                ],
+                                "name": "chained-callbacks.js",
+                                "end": [
+                                    1,
+                                    33
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    35
+                                ],
+                                "name": "chained-callbacks.js",
+                                "end": [
+                                    1,
+                                    36
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'a' identifier with the 'b' identifier in the this.reduce(…) method call",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    34
+                                ],
+                                "name": "chained-callbacks.js",
+                                "end": [
+                                    1,
+                                    35
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    37
+                                ],
+                                "name": "chained-callbacks.js",
+                                "end": [
+                                    1,
+                                    38
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'b' identifier with the 'a' identifier in the this.reduce(…) method call",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "chained-callbacks.js"
+    ],
+    "sha1": "d00c5e7da7eb6dfcdc63fa490b3e1f5c1481d41d",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "9c042fe39e2f19c0e5f6cd64026de2a03c4c0896"
+}
+,{
+    "testCaseDescription": "javascript-chained-callbacks-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "chained-callbacks.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "chained-callbacks.js",
+                            "end": [
+                                1,
+                                42
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'this.reduce(…)' method call",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "chained-callbacks.js",
+                            "end": [
+                                2,
+                                39
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'this.map(…)' method call",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "chained-callbacks.js",
+                            "end": [
+                                2,
+                                42
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'this.reduce(…)' method call",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "chained-callbacks.js"
+    ],
+    "sha1": "9c042fe39e2f19c0e5f6cd64026de2a03c4c0896",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "6a9959f752a3845f39f9044f342173af99c4ee6f"
+}
+,{
+    "testCaseDescription": "javascript-chained-callbacks-delete-test",
+    "expectedResult": {
+        "changes": {
+            "chained-callbacks.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "chained-callbacks.js",
+                            "end": [
+                                1,
+                                39
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'this.map(…)' method call",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "chained-callbacks.js"
+    ],
+    "sha1": "6a9959f752a3845f39f9044f342173af99c4ee6f",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "a9b91380938e6d3842fd308280c0a638bb537ba5"
+}
+,{
+    "testCaseDescription": "javascript-chained-callbacks-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "chained-callbacks.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "chained-callbacks.js",
+                            "end": [
+                                1,
+                                42
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'this.reduce(…)' method call",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "chained-callbacks.js"
+    ],
+    "sha1": "a9b91380938e6d3842fd308280c0a638bb537ba5",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "cf31ddf834d011d1d55eee3da85c70f15eea67f1"
+}]

test/corpus/diff-summaries/javascript/chained-property-access.json

@@ -0,0 +1,368 @@
+[{
+    "testCaseDescription": "javascript-chained-property-access-insert-test",
+    "expectedResult": {
+        "changes": {
+            "chained-property-access.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "chained-property-access.js",
+                            "end": [
+                                2,
+                                1
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'returned.promise().done(…).fail(…)' return statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "chained-property-access.js"
+    ],
+    "sha1": "07c5dd47cd837cd06d7d034c049ea6002a5e0980",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "1c568a6a258b36c95bb3701e878ae08a1c9e79ba"
+}
+,{
+    "testCaseDescription": "javascript-chained-property-access-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "chained-property-access.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "chained-property-access.js",
+                            "end": [
+                                2,
+                                1
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'returned.promise().done(…).fail(…)' return statement",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "chained-property-access.js",
+                            "end": [
+                                3,
+                                1
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'returned.promise().done(…).fail(…)' return statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "chained-property-access.js"
+    ],
+    "sha1": "1c568a6a258b36c95bb3701e878ae08a1c9e79ba",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "7abc5ff0a2ca47dde4b277648bc657d825c910d3"
+}
+,{
+    "testCaseDescription": "javascript-chained-property-access-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "chained-property-access.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    33
+                                ],
+                                "name": "chained-property-access.js",
+                                "end": [
+                                    1,
+                                    43
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    33
+                                ],
+                                "name": "chained-property-access.js",
+                                "end": [
+                                    1,
+                                    41
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'otherDefer' identifier with the 'newDefer' identifier in the returned.promise().done(…) method call",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    60
+                                ],
+                                "name": "chained-property-access.js",
+                                "end": [
+                                    1,
+                                    70
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    58
+                                ],
+                                "name": "chained-property-access.js",
+                                "end": [
+                                    1,
+                                    66
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'otherDefer' identifier with the 'newDefer' identifier in the returned.promise().done(…).fail(…) method call",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "chained-property-access.js"
+    ],
+    "sha1": "7abc5ff0a2ca47dde4b277648bc657d825c910d3",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "6b0bfd2f77ff616e1f944328fbcac86513799b91"
+}
+,{
+    "testCaseDescription": "javascript-chained-property-access-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "chained-property-access.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    33
+                                ],
+                                "name": "chained-property-access.js",
+                                "end": [
+                                    1,
+                                    41
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    33
+                                ],
+                                "name": "chained-property-access.js",
+                                "end": [
+                                    1,
+                                    43
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'newDefer' identifier with the 'otherDefer' identifier in the returned.promise().done(…) method call",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    58
+                                ],
+                                "name": "chained-property-access.js",
+                                "end": [
+                                    1,
+                                    66
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    60
+                                ],
+                                "name": "chained-property-access.js",
+                                "end": [
+                                    1,
+                                    70
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'newDefer' identifier with the 'otherDefer' identifier in the returned.promise().done(…).fail(…) method call",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "chained-property-access.js"
+    ],
+    "sha1": "6b0bfd2f77ff616e1f944328fbcac86513799b91",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "f87e928b3a52d1d9457b8389cc414276799c70c6"
+}
+,{
+    "testCaseDescription": "javascript-chained-property-access-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "chained-property-access.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "chained-property-access.js",
+                            "end": [
+                                2,
+                                1
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'returned.promise().done(…).fail(…)' return statement",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "chained-property-access.js",
+                            "end": [
+                                3,
+                                1
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'returned.promise().done(…).fail(…)' return statement",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "chained-property-access.js",
+                            "end": [
+                                3,
+                                1
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'returned.promise().done(…).fail(…)' return statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "chained-property-access.js"
+    ],
+    "sha1": "f87e928b3a52d1d9457b8389cc414276799c70c6",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "1056591b7f8f24ed7718a8d9b3f515eb0b48a29a"
+}
+,{
+    "testCaseDescription": "javascript-chained-property-access-delete-test",
+    "expectedResult": {
+        "changes": {
+            "chained-property-access.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "chained-property-access.js",
+                            "end": [
+                                2,
+                                1
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'returned.promise().done(…).fail(…)' return statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "chained-property-access.js"
+    ],
+    "sha1": "1056591b7f8f24ed7718a8d9b3f515eb0b48a29a",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "de450f4e2eb24b89b5d66301b772d4f9714e7919"
+}
+,{
+    "testCaseDescription": "javascript-chained-property-access-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "chained-property-access.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "chained-property-access.js",
+                            "end": [
+                                2,
+                                1
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'returned.promise().done(…).fail(…)' return statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "chained-property-access.js"
+    ],
+    "sha1": "de450f4e2eb24b89b5d66301b772d4f9714e7919",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "3717d88f796c52203c37c0d8440b823c78192c49"
+}]

test/corpus/diff-summaries/javascript/class.json

@@ -0,0 +1,428 @@
+[{
+    "testCaseDescription": "javascript-class-insert-test",
+    "expectedResult": {
+        "changes": {
+            "class.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "class.js",
+                            "end": [
+                                1,
+                                87
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'Foo' class",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "class.js"
+    ],
+    "sha1": "05ac6c8e85dcf3c89620fde92c3f7cccf4ca5d18",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "d0516334378ca54458689813316ca9f3e792b9d0"
+}
+,{
+    "testCaseDescription": "javascript-class-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "class.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "class.js",
+                            "end": [
+                                1,
+                                85
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'Foo' class",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "class.js",
+                            "end": [
+                                2,
+                                87
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'Foo' class",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "class.js"
+    ],
+    "sha1": "d0516334378ca54458689813316ca9f3e792b9d0",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "f0d1b629278eb502b25fd9d266065451cdd48405"
+}
+,{
+    "testCaseDescription": "javascript-class-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "class.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    20
+                                ],
+                                "name": "class.js",
+                                "end": [
+                                    1,
+                                    23
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    20
+                                ],
+                                "name": "class.js",
+                                "end": [
+                                    1,
+                                    23
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'foo' identifier with the 'one' identifier in the one method of the 'Foo' class",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    42
+                                ],
+                                "name": "class.js",
+                                "end": [
+                                    1,
+                                    45
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    42
+                                ],
+                                "name": "class.js",
+                                "end": [
+                                    1,
+                                    45
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'bar' identifier with the 'two' identifier in the two method of the 'Foo' class",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    63
+                                ],
+                                "name": "class.js",
+                                "end": [
+                                    1,
+                                    66
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    63
+                                ],
+                                "name": "class.js",
+                                "end": [
+                                    1,
+                                    68
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'baz' identifier with the 'three' identifier in the three method of the 'Foo' class",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "class.js"
+    ],
+    "sha1": "f0d1b629278eb502b25fd9d266065451cdd48405",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "287224754bbb2fc1d5d3e66af924ab2e4b1a6e15"
+}
+,{
+    "testCaseDescription": "javascript-class-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "class.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    20
+                                ],
+                                "name": "class.js",
+                                "end": [
+                                    1,
+                                    23
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    20
+                                ],
+                                "name": "class.js",
+                                "end": [
+                                    1,
+                                    23
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'one' identifier with the 'foo' identifier in the foo method of the 'Foo' class",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    42
+                                ],
+                                "name": "class.js",
+                                "end": [
+                                    1,
+                                    45
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    42
+                                ],
+                                "name": "class.js",
+                                "end": [
+                                    1,
+                                    45
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'two' identifier with the 'bar' identifier in the bar method of the 'Foo' class",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    63
+                                ],
+                                "name": "class.js",
+                                "end": [
+                                    1,
+                                    68
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    63
+                                ],
+                                "name": "class.js",
+                                "end": [
+                                    1,
+                                    66
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'three' identifier with the 'baz' identifier in the baz method of the 'Foo' class",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "class.js"
+    ],
+    "sha1": "287224754bbb2fc1d5d3e66af924ab2e4b1a6e15",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "faf44add1dac5da1190877cfbe29f2166a87cb70"
+}
+,{
+    "testCaseDescription": "javascript-class-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "class.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "class.js",
+                            "end": [
+                                1,
+                                85
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'Foo' class",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "class.js",
+                            "end": [
+                                2,
+                                87
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'Foo' class",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "class.js",
+                            "end": [
+                                2,
+                                85
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'Foo' class",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "class.js"
+    ],
+    "sha1": "faf44add1dac5da1190877cfbe29f2166a87cb70",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "c9d86ff39cf88d63bef375c0f1f6bee48fad7469"
+}
+,{
+    "testCaseDescription": "javascript-class-delete-test",
+    "expectedResult": {
+        "changes": {
+            "class.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "class.js",
+                            "end": [
+                                1,
+                                87
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'Foo' class",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "class.js"
+    ],
+    "sha1": "c9d86ff39cf88d63bef375c0f1f6bee48fad7469",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "925c03b275a76023914adc08c757bb7375f31bbd"
+}
+,{
+    "testCaseDescription": "javascript-class-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "class.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "class.js",
+                            "end": [
+                                1,
+                                85
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'Foo' class",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "class.js"
+    ],
+    "sha1": "925c03b275a76023914adc08c757bb7375f31bbd",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "72a672d52b6952c146edab2927b3b05abd022921"
+}]

test/corpus/diff-summaries/javascript/comma-operator.json

@@ -0,0 +1,418 @@
+[{
+    "testCaseDescription": "javascript-comma-operator-insert-test",
+    "expectedResult": {
+        "changes": {
+            "comma-operator.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "comma-operator.js",
+                            "end": [
+                                1,
+                                6
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'a' assignment",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                8
+                            ],
+                            "name": "comma-operator.js",
+                            "end": [
+                                1,
+                                13
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'b' assignment",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "comma-operator.js"
+    ],
+    "sha1": "ea966e7428b15b541246b765517db3f0ef1c6af8",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "89fefd3a2c9fb540528c4000768a6ef747cd59d0"
+}
+,{
+    "testCaseDescription": "javascript-comma-operator-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "comma-operator.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "comma-operator.js",
+                            "end": [
+                                1,
+                                23
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'c' assignment",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "comma-operator.js",
+                            "end": [
+                                2,
+                                6
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'a' assignment",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                8
+                            ],
+                            "name": "comma-operator.js",
+                            "end": [
+                                2,
+                                13
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'b' assignment",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "comma-operator.js"
+    ],
+    "sha1": "89fefd3a2c9fb540528c4000768a6ef747cd59d0",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "d18b8317fdd54ea56ecc8a6f5163100fbb90804f"
+}
+,{
+    "testCaseDescription": "javascript-comma-operator-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "comma-operator.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "comma-operator.js",
+                            "end": [
+                                1,
+                                6
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'a' assignment",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                8
+                            ],
+                            "name": "comma-operator.js",
+                            "end": [
+                                1,
+                                13
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'b' assignment",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "comma-operator.js",
+                            "end": [
+                                1,
+                                23
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'c' assignment",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "comma-operator.js"
+    ],
+    "sha1": "d18b8317fdd54ea56ecc8a6f5163100fbb90804f",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "004af9fd96c38181e344af8dab95b192f1c1dfe2"
+}
+,{
+    "testCaseDescription": "javascript-comma-operator-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "comma-operator.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "comma-operator.js",
+                            "end": [
+                                1,
+                                23
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'c' assignment",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "comma-operator.js",
+                            "end": [
+                                1,
+                                6
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'a' assignment",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                8
+                            ],
+                            "name": "comma-operator.js",
+                            "end": [
+                                1,
+                                13
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'b' assignment",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "comma-operator.js"
+    ],
+    "sha1": "004af9fd96c38181e344af8dab95b192f1c1dfe2",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "0d2764a507da37777c1f1726fba8261b84f7bcb0"
+}
+,{
+    "testCaseDescription": "javascript-comma-operator-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "comma-operator.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "comma-operator.js",
+                            "end": [
+                                1,
+                                23
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'c' assignment",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "comma-operator.js",
+                            "end": [
+                                2,
+                                6
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'a' assignment",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                8
+                            ],
+                            "name": "comma-operator.js",
+                            "end": [
+                                2,
+                                13
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'b' assignment",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "comma-operator.js",
+                            "end": [
+                                2,
+                                23
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'c' assignment",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "comma-operator.js"
+    ],
+    "sha1": "0d2764a507da37777c1f1726fba8261b84f7bcb0",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "7ce2f66bf4aa19bb752574fed5e2416e405dd67f"
+}
+,{
+    "testCaseDescription": "javascript-comma-operator-delete-test",
+    "expectedResult": {
+        "changes": {
+            "comma-operator.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "comma-operator.js",
+                            "end": [
+                                1,
+                                6
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'a' assignment",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                8
+                            ],
+                            "name": "comma-operator.js",
+                            "end": [
+                                1,
+                                13
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'b' assignment",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "comma-operator.js"
+    ],
+    "sha1": "7ce2f66bf4aa19bb752574fed5e2416e405dd67f",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "2e0718a5d9166e53a839ce51dccca62297668a6d"
+}
+,{
+    "testCaseDescription": "javascript-comma-operator-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "comma-operator.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "comma-operator.js",
+                            "end": [
+                                1,
+                                23
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'c' assignment",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "comma-operator.js"
+    ],
+    "sha1": "2e0718a5d9166e53a839ce51dccca62297668a6d",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "7d593b800284097a4d4f70fe25aebef1cbbe69c3"
+}]

test/corpus/diff-summaries/javascript/comment.json

@@ -0,0 +1,308 @@
+[{
+    "testCaseDescription": "javascript-comment-insert-test",
+    "expectedResult": {
+        "changes": {
+            "comment.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "comment.js",
+                            "end": [
+                                1,
+                                22
+                            ]
+                        }
+                    },
+                    "summary": "Added the '// This is a property' comment",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "comment.js"
+    ],
+    "sha1": "b00fa825ca435ba80830373e95ab22dd77ce9326",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "2e607c097d74497502eb9b05f61574413df5a704"
+}
+,{
+    "testCaseDescription": "javascript-comment-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "comment.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "comment.js",
+                            "end": [
+                                3,
+                                3
+                            ]
+                        }
+                    },
+                    "summary": "Added the '/*\n * This is a method\n*/' comment",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                4,
+                                1
+                            ],
+                            "name": "comment.js",
+                            "end": [
+                                4,
+                                22
+                            ]
+                        }
+                    },
+                    "summary": "Added the '// This is a property' comment",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "comment.js"
+    ],
+    "sha1": "2e607c097d74497502eb9b05f61574413df5a704",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "03b1da21726c00724121764c61d9148a5561e972"
+}
+,{
+    "testCaseDescription": "javascript-comment-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "comment.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    1
+                                ],
+                                "name": "comment.js",
+                                "end": [
+                                    3,
+                                    3
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    1
+                                ],
+                                "name": "comment.js",
+                                "end": [
+                                    1,
+                                    22
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the '/*\n * This is a method\n*/' comment with the '// This is a property' comment",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "comment.js"
+    ],
+    "sha1": "03b1da21726c00724121764c61d9148a5561e972",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "2bfa931c9fdb2a9e6a5362bc4edcf55fd54afc5b"
+}
+,{
+    "testCaseDescription": "javascript-comment-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "comment.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    1
+                                ],
+                                "name": "comment.js",
+                                "end": [
+                                    1,
+                                    22
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    1
+                                ],
+                                "name": "comment.js",
+                                "end": [
+                                    3,
+                                    3
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the '// This is a property' comment with the '/*\n * This is a method\n*/' comment",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "comment.js"
+    ],
+    "sha1": "2bfa931c9fdb2a9e6a5362bc4edcf55fd54afc5b",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "16abf9f672b794a292a6328925ecb9e5b77e4e3e"
+}
+,{
+    "testCaseDescription": "javascript-comment-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "comment.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "comment.js",
+                            "end": [
+                                3,
+                                3
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the '/*\n * This is a method\n*/' comment",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                4,
+                                1
+                            ],
+                            "name": "comment.js",
+                            "end": [
+                                4,
+                                22
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the '// This is a property' comment",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "comment.js",
+                            "end": [
+                                4,
+                                3
+                            ]
+                        }
+                    },
+                    "summary": "Added the '/*\n * This is a method\n*/' comment",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "comment.js"
+    ],
+    "sha1": "16abf9f672b794a292a6328925ecb9e5b77e4e3e",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "253e6af1000fd09a2472ce58f2294e56a5b072a5"
+}
+,{
+    "testCaseDescription": "javascript-comment-delete-test",
+    "expectedResult": {
+        "changes": {
+            "comment.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "comment.js",
+                            "end": [
+                                1,
+                                22
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the '// This is a property' comment",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "comment.js"
+    ],
+    "sha1": "253e6af1000fd09a2472ce58f2294e56a5b072a5",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "5dd2f4591f46cc567e9ef4d08528a8139f329bfe"
+}
+,{
+    "testCaseDescription": "javascript-comment-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "comment.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "comment.js",
+                            "end": [
+                                3,
+                                3
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the '/*\n * This is a method\n*/' comment",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "comment.js"
+    ],
+    "sha1": "5dd2f4591f46cc567e9ef4d08528a8139f329bfe",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "df276ed5f435d4cf1363008ae573ea99ba39e175"
+}]

test/corpus/diff-summaries/javascript/constructor-call.json

@@ -0,0 +1,308 @@
+[{
+    "testCaseDescription": "javascript-constructor-call-insert-test",
+    "expectedResult": {
+        "changes": {
+            "constructor-call.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "constructor-call.js",
+                            "end": [
+                                1,
+                                27
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'module.Klass(1, \"two\")' constructor",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "constructor-call.js"
+    ],
+    "sha1": "e5315f0371489f42d527c318faa1406833bb3c86",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "3ab58f25a58c73e8b63bf047879dc80453f67ca3"
+}
+,{
+    "testCaseDescription": "javascript-constructor-call-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "constructor-call.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "constructor-call.js",
+                            "end": [
+                                1,
+                                29
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'module.Klass(1, \"three\")' constructor",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "constructor-call.js",
+                            "end": [
+                                2,
+                                27
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'module.Klass(1, \"two\")' constructor",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "constructor-call.js"
+    ],
+    "sha1": "3ab58f25a58c73e8b63bf047879dc80453f67ca3",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "1481a195f0a198d73a647c8b75da4d7dc7221894"
+}
+,{
+    "testCaseDescription": "javascript-constructor-call-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "constructor-call.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    21
+                                ],
+                                "name": "constructor-call.js",
+                                "end": [
+                                    1,
+                                    28
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    21
+                                ],
+                                "name": "constructor-call.js",
+                                "end": [
+                                    1,
+                                    26
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the \"three\" string with the \"two\" string in the module.Klass(1, \"two\") method call",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "constructor-call.js"
+    ],
+    "sha1": "1481a195f0a198d73a647c8b75da4d7dc7221894",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "ba525ceaac882771bf3028d5c750f938114e96d2"
+}
+,{
+    "testCaseDescription": "javascript-constructor-call-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "constructor-call.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    21
+                                ],
+                                "name": "constructor-call.js",
+                                "end": [
+                                    1,
+                                    26
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    21
+                                ],
+                                "name": "constructor-call.js",
+                                "end": [
+                                    1,
+                                    28
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the \"two\" string with the \"three\" string in the module.Klass(1, \"three\") method call",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "constructor-call.js"
+    ],
+    "sha1": "ba525ceaac882771bf3028d5c750f938114e96d2",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "4b4ec51a435eea48627eedf5abc5e418a1fe6a55"
+}
+,{
+    "testCaseDescription": "javascript-constructor-call-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "constructor-call.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "constructor-call.js",
+                            "end": [
+                                1,
+                                29
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'module.Klass(1, \"three\")' constructor",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "constructor-call.js",
+                            "end": [
+                                2,
+                                27
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'module.Klass(1, \"two\")' constructor",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "constructor-call.js",
+                            "end": [
+                                2,
+                                29
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'module.Klass(1, \"three\")' constructor",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "constructor-call.js"
+    ],
+    "sha1": "4b4ec51a435eea48627eedf5abc5e418a1fe6a55",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "5d2a91a3bae082f9b7805f6dfca606e93e795432"
+}
+,{
+    "testCaseDescription": "javascript-constructor-call-delete-test",
+    "expectedResult": {
+        "changes": {
+            "constructor-call.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "constructor-call.js",
+                            "end": [
+                                1,
+                                27
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'module.Klass(1, \"two\")' constructor",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "constructor-call.js"
+    ],
+    "sha1": "5d2a91a3bae082f9b7805f6dfca606e93e795432",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "dbb99c0fe06226687ed383f68ef1b5d4e15f35f6"
+}
+,{
+    "testCaseDescription": "javascript-constructor-call-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "constructor-call.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "constructor-call.js",
+                            "end": [
+                                1,
+                                29
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'module.Klass(1, \"three\")' constructor",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "constructor-call.js"
+    ],
+    "sha1": "dbb99c0fe06226687ed383f68ef1b5d4e15f35f6",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "a871e92442fa237af75a13a311d49a15bcea9444"
+}]

test/corpus/diff-summaries/javascript/delete-operator.json

@@ -0,0 +1,308 @@
+[{
+    "testCaseDescription": "javascript-delete-operator-insert-test",
+    "expectedResult": {
+        "changes": {
+            "delete-operator.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "delete-operator.js",
+                            "end": [
+                                1,
+                                21
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'delete thing['prop']' operator",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "delete-operator.js"
+    ],
+    "sha1": "0014c5d8fc3e6f9d08e268ebbb2d42919d5b4991",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "1bf82468139fc9bae884877d4642cb378d30e388"
+}
+,{
+    "testCaseDescription": "javascript-delete-operator-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "delete-operator.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "delete-operator.js",
+                            "end": [
+                                1,
+                                18
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'delete thing.prop' operator",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "delete-operator.js",
+                            "end": [
+                                2,
+                                21
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'delete thing['prop']' operator",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "delete-operator.js"
+    ],
+    "sha1": "1bf82468139fc9bae884877d4642cb378d30e388",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "8daf29e348abe84e12f3876f0d414a3d1ff66133"
+}
+,{
+    "testCaseDescription": "javascript-delete-operator-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "delete-operator.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    1
+                                ],
+                                "name": "delete-operator.js",
+                                "end": [
+                                    1,
+                                    18
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    1
+                                ],
+                                "name": "delete-operator.js",
+                                "end": [
+                                    1,
+                                    21
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'delete thing.prop' operator with the 'delete thing['prop']' operator",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "delete-operator.js"
+    ],
+    "sha1": "8daf29e348abe84e12f3876f0d414a3d1ff66133",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "c0a5da4ddc67f830084586b2327558655a70855a"
+}
+,{
+    "testCaseDescription": "javascript-delete-operator-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "delete-operator.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    1
+                                ],
+                                "name": "delete-operator.js",
+                                "end": [
+                                    1,
+                                    21
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    1
+                                ],
+                                "name": "delete-operator.js",
+                                "end": [
+                                    1,
+                                    18
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'delete thing['prop']' operator with the 'delete thing.prop' operator",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "delete-operator.js"
+    ],
+    "sha1": "c0a5da4ddc67f830084586b2327558655a70855a",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "cec4caaf5abbc34a89ed4f4695648f6c07a47419"
+}
+,{
+    "testCaseDescription": "javascript-delete-operator-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "delete-operator.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "delete-operator.js",
+                            "end": [
+                                1,
+                                18
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'delete thing.prop' operator",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "delete-operator.js",
+                            "end": [
+                                2,
+                                21
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'delete thing['prop']' operator",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "delete-operator.js",
+                            "end": [
+                                2,
+                                18
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'delete thing.prop' operator",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "delete-operator.js"
+    ],
+    "sha1": "cec4caaf5abbc34a89ed4f4695648f6c07a47419",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "497cf34db38a72640cc8ce570306c591bba9f02f"
+}
+,{
+    "testCaseDescription": "javascript-delete-operator-delete-test",
+    "expectedResult": {
+        "changes": {
+            "delete-operator.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "delete-operator.js",
+                            "end": [
+                                1,
+                                21
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'delete thing['prop']' operator",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "delete-operator.js"
+    ],
+    "sha1": "497cf34db38a72640cc8ce570306c591bba9f02f",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "045574a46a7e7f97875d188458465b12f0c742a8"
+}
+,{
+    "testCaseDescription": "javascript-delete-operator-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "delete-operator.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "delete-operator.js",
+                            "end": [
+                                1,
+                                18
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'delete thing.prop' operator",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "delete-operator.js"
+    ],
+    "sha1": "045574a46a7e7f97875d188458465b12f0c742a8",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "91bb86f2c473fce6ff1ddd4c4e25a6362131920f"
+}]

test/corpus/diff-summaries/javascript/do-while-statement.json

@@ -0,0 +1,368 @@
+[{
+    "testCaseDescription": "javascript-do-while-statement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "do-while-statement.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "do-while-statement.js",
+                            "end": [
+                                1,
+                                42
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'true' do/while statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "do-while-statement.js"
+    ],
+    "sha1": "a373c4a7201be2aa145e60cf15e0adfedc85aac5",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "cebe84530c2734410e83fadc8f0aeb3a6b3ce715"
+}
+,{
+    "testCaseDescription": "javascript-do-while-statement-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "do-while-statement.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "do-while-statement.js",
+                            "end": [
+                                1,
+                                48
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'false' do/while statement",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "do-while-statement.js",
+                            "end": [
+                                2,
+                                42
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'true' do/while statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "do-while-statement.js"
+    ],
+    "sha1": "cebe84530c2734410e83fadc8f0aeb3a6b3ce715",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "87bbd6f72fcd3eef6b92d656dc2fe4fb9139ba94"
+}
+,{
+    "testCaseDescription": "javascript-do-while-statement-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "do-while-statement.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    18
+                                ],
+                                "name": "do-while-statement.js",
+                                "end": [
+                                    1,
+                                    29
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    18
+                                ],
+                                "name": "do-while-statement.js",
+                                "end": [
+                                    1,
+                                    24
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'replacement' identifier with the 'insert' identifier in the console.log(insert) method call",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    41
+                                ],
+                                "name": "do-while-statement.js",
+                                "end": [
+                                    1,
+                                    46
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    36
+                                ],
+                                "name": "do-while-statement.js",
+                                "end": [
+                                    1,
+                                    40
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced 'false' with 'true' in the true do/while statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "do-while-statement.js"
+    ],
+    "sha1": "87bbd6f72fcd3eef6b92d656dc2fe4fb9139ba94",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "d9f0f483d83873729799b3d7daccf467ff355a13"
+}
+,{
+    "testCaseDescription": "javascript-do-while-statement-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "do-while-statement.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    18
+                                ],
+                                "name": "do-while-statement.js",
+                                "end": [
+                                    1,
+                                    24
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    18
+                                ],
+                                "name": "do-while-statement.js",
+                                "end": [
+                                    1,
+                                    29
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'insert' identifier with the 'replacement' identifier in the console.log(replacement) method call",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    36
+                                ],
+                                "name": "do-while-statement.js",
+                                "end": [
+                                    1,
+                                    40
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    41
+                                ],
+                                "name": "do-while-statement.js",
+                                "end": [
+                                    1,
+                                    46
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced 'true' with 'false' in the false do/while statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "do-while-statement.js"
+    ],
+    "sha1": "d9f0f483d83873729799b3d7daccf467ff355a13",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "0806416202b69971446592511927fd35e2d3df53"
+}
+,{
+    "testCaseDescription": "javascript-do-while-statement-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "do-while-statement.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "do-while-statement.js",
+                            "end": [
+                                1,
+                                48
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'false' do/while statement",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "do-while-statement.js",
+                            "end": [
+                                2,
+                                42
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'true' do/while statement",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "do-while-statement.js",
+                            "end": [
+                                2,
+                                48
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'false' do/while statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "do-while-statement.js"
+    ],
+    "sha1": "0806416202b69971446592511927fd35e2d3df53",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "1310973b3dc9c6f7e0f20bb7842e869b5a355e7b"
+}
+,{
+    "testCaseDescription": "javascript-do-while-statement-delete-test",
+    "expectedResult": {
+        "changes": {
+            "do-while-statement.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "do-while-statement.js",
+                            "end": [
+                                1,
+                                42
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'true' do/while statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "do-while-statement.js"
+    ],
+    "sha1": "1310973b3dc9c6f7e0f20bb7842e869b5a355e7b",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "d0e72fbaf526e2beb6f4dbdbf8b91b972315ad91"
+}
+,{
+    "testCaseDescription": "javascript-do-while-statement-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "do-while-statement.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "do-while-statement.js",
+                            "end": [
+                                1,
+                                48
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'false' do/while statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "do-while-statement.js"
+    ],
+    "sha1": "d0e72fbaf526e2beb6f4dbdbf8b91b972315ad91",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "a6c49cc7711970d9b1fdcfeef8ea1b312bcf0ace"
+}]

test/corpus/diff-summaries/javascript/false.json

@@ -0,0 +1,316 @@
+[{
+    "testCaseDescription": "javascript-false-insert-test",
+    "expectedResult": {
+        "changes": {
+            "false.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "false.js",
+                            "end": [
+                                1,
+                                6
+                            ]
+                        }
+                    },
+                    "summary": "Added 'false'",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "false.js"
+    ],
+    "sha1": "d1241fa4218f33189f78a91a9513ca7e2120a2a0",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "5c3adaccd872d776c6b837d871a79cf1f0c520ec"
+}
+,{
+    "testCaseDescription": "javascript-false-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "false.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "false.js",
+                            "end": [
+                                1,
+                                14
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'false' return statement",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "false.js",
+                            "end": [
+                                2,
+                                6
+                            ]
+                        }
+                    },
+                    "summary": "Added 'false'",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "false.js"
+    ],
+    "sha1": "5c3adaccd872d776c6b837d871a79cf1f0c520ec",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "791af8f5bd8ea06a1d83fe6a78788e02d2bb468d"
+}
+,{
+    "testCaseDescription": "javascript-false-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "false.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "false.js",
+                            "end": [
+                                1,
+                                6
+                            ]
+                        }
+                    },
+                    "summary": "Added 'false'",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "false.js",
+                            "end": [
+                                1,
+                                14
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'false' return statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "false.js"
+    ],
+    "sha1": "791af8f5bd8ea06a1d83fe6a78788e02d2bb468d",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "19b007fa1339fa0aa105833446507b6cc54688ad"
+}
+,{
+    "testCaseDescription": "javascript-false-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "false.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "false.js",
+                            "end": [
+                                1,
+                                14
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'false' return statement",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "false.js",
+                            "end": [
+                                1,
+                                6
+                            ]
+                        }
+                    },
+                    "summary": "Deleted 'false'",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "false.js"
+    ],
+    "sha1": "19b007fa1339fa0aa105833446507b6cc54688ad",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "de949429ff3d674e788d99101942f61de3beb083"
+}
+,{
+    "testCaseDescription": "javascript-false-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "false.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "false.js",
+                            "end": [
+                                1,
+                                14
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'false' return statement",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "false.js",
+                            "end": [
+                                2,
+                                6
+                            ]
+                        }
+                    },
+                    "summary": "Deleted 'false'",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "false.js",
+                            "end": [
+                                2,
+                                14
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'false' return statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "false.js"
+    ],
+    "sha1": "de949429ff3d674e788d99101942f61de3beb083",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "a53c2421cba5ff7a05a70181604bae01a600aaa4"
+}
+,{
+    "testCaseDescription": "javascript-false-delete-test",
+    "expectedResult": {
+        "changes": {
+            "false.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "false.js",
+                            "end": [
+                                1,
+                                6
+                            ]
+                        }
+                    },
+                    "summary": "Deleted 'false'",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "false.js"
+    ],
+    "sha1": "a53c2421cba5ff7a05a70181604bae01a600aaa4",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "06a9f053e100d69f09fa0218b8cd1b815d55f820"
+}
+,{
+    "testCaseDescription": "javascript-false-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "false.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "false.js",
+                            "end": [
+                                1,
+                                14
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'false' return statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "false.js"
+    ],
+    "sha1": "06a9f053e100d69f09fa0218b8cd1b815d55f820",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "05ac6c8e85dcf3c89620fde92c3f7cccf4ca5d18"
+}]

test/corpus/diff-summaries/javascript/for-in-statement.json

@@ -0,0 +1,428 @@
+[{
+    "testCaseDescription": "javascript-for-in-statement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "for-in-statement.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "for-in-statement.js",
+                            "end": [
+                                1,
+                                35
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'thing in things' for statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "for-in-statement.js"
+    ],
+    "sha1": "2017d7a8b91c62e06d4de3654b0a7a2d550e55b9",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "9af240cfa0f7af52df4650eddcac4bbd33dd5513"
+}
+,{
+    "testCaseDescription": "javascript-for-in-statement-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "for-in-statement.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "for-in-statement.js",
+                            "end": [
+                                1,
+                                32
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'item in items' for statement",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "for-in-statement.js",
+                            "end": [
+                                2,
+                                35
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'thing in things' for statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "for-in-statement.js"
+    ],
+    "sha1": "9af240cfa0f7af52df4650eddcac4bbd33dd5513",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "58da861d6aa35b1f3a741d2e32ecef9a23b3bfb9"
+}
+,{
+    "testCaseDescription": "javascript-for-in-statement-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "for-in-statement.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    6
+                                ],
+                                "name": "for-in-statement.js",
+                                "end": [
+                                    1,
+                                    10
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    6
+                                ],
+                                "name": "for-in-statement.js",
+                                "end": [
+                                    1,
+                                    11
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'item' identifier with the 'thing' identifier",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    14
+                                ],
+                                "name": "for-in-statement.js",
+                                "end": [
+                                    1,
+                                    19
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    15
+                                ],
+                                "name": "for-in-statement.js",
+                                "end": [
+                                    1,
+                                    21
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'items' identifier with the 'things' identifier",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    23
+                                ],
+                                "name": "for-in-statement.js",
+                                "end": [
+                                    1,
+                                    27
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    25
+                                ],
+                                "name": "for-in-statement.js",
+                                "end": [
+                                    1,
+                                    30
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'item' identifier with the 'thing' identifier in the thing() function call",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "for-in-statement.js"
+    ],
+    "sha1": "58da861d6aa35b1f3a741d2e32ecef9a23b3bfb9",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "37df916c1924ee482548cf1b653ca2f1adc897a4"
+}
+,{
+    "testCaseDescription": "javascript-for-in-statement-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "for-in-statement.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    6
+                                ],
+                                "name": "for-in-statement.js",
+                                "end": [
+                                    1,
+                                    11
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    6
+                                ],
+                                "name": "for-in-statement.js",
+                                "end": [
+                                    1,
+                                    10
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'thing' identifier with the 'item' identifier",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    15
+                                ],
+                                "name": "for-in-statement.js",
+                                "end": [
+                                    1,
+                                    21
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    14
+                                ],
+                                "name": "for-in-statement.js",
+                                "end": [
+                                    1,
+                                    19
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'things' identifier with the 'items' identifier",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    25
+                                ],
+                                "name": "for-in-statement.js",
+                                "end": [
+                                    1,
+                                    30
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    23
+                                ],
+                                "name": "for-in-statement.js",
+                                "end": [
+                                    1,
+                                    27
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'thing' identifier with the 'item' identifier in the item() function call",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "for-in-statement.js"
+    ],
+    "sha1": "37df916c1924ee482548cf1b653ca2f1adc897a4",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "517e2f1868a6cf33ab920bc26a84027328f44b55"
+}
+,{
+    "testCaseDescription": "javascript-for-in-statement-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "for-in-statement.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "for-in-statement.js",
+                            "end": [
+                                1,
+                                32
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'item in items' for statement",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "for-in-statement.js",
+                            "end": [
+                                2,
+                                35
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'thing in things' for statement",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "for-in-statement.js",
+                            "end": [
+                                2,
+                                32
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'item in items' for statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "for-in-statement.js"
+    ],
+    "sha1": "517e2f1868a6cf33ab920bc26a84027328f44b55",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "095b4a966cb6a42a638f120901337fe3937afbfc"
+}
+,{
+    "testCaseDescription": "javascript-for-in-statement-delete-test",
+    "expectedResult": {
+        "changes": {
+            "for-in-statement.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "for-in-statement.js",
+                            "end": [
+                                1,
+                                35
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'thing in things' for statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "for-in-statement.js"
+    ],
+    "sha1": "095b4a966cb6a42a638f120901337fe3937afbfc",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "994f9b8ba0c57e8397eb9bbdb74ac8503aeeb291"
+}
+,{
+    "testCaseDescription": "javascript-for-in-statement-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "for-in-statement.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "for-in-statement.js",
+                            "end": [
+                                1,
+                                32
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'item in items' for statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "for-in-statement.js"
+    ],
+    "sha1": "994f9b8ba0c57e8397eb9bbdb74ac8503aeeb291",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "2747446a2e77138d8a05f4ac9068b6c2fefe8c3d"
+}]

test/corpus/diff-summaries/javascript/for-loop-with-in-statement.json

@@ -0,0 +1,368 @@
+[{
+    "testCaseDescription": "javascript-for-loop-with-in-statement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "for-loop-with-in-statement.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "for-loop-with-in-statement.js",
+                            "end": [
+                                1,
+                                63
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'key in something && i = 0; i < n; i++' for statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "for-loop-with-in-statement.js"
+    ],
+    "sha1": "faab59d023f70bb2d675e7d0671d36bc82dc9d0f",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "184201b3796e0d955659a52b5d2b1624a9e68ef2"
+}
+,{
+    "testCaseDescription": "javascript-for-loop-with-in-statement-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "for-loop-with-in-statement.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "for-loop-with-in-statement.js",
+                            "end": [
+                                1,
+                                73
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'otherKey in something && i = 0; i < n; i++' for statement",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "for-loop-with-in-statement.js",
+                            "end": [
+                                2,
+                                63
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'key in something && i = 0; i < n; i++' for statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "for-loop-with-in-statement.js"
+    ],
+    "sha1": "184201b3796e0d955659a52b5d2b1624a9e68ef2",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "586a2c3efd9651e7be12ec5ef857b734daffea6a"
+}
+,{
+    "testCaseDescription": "javascript-for-loop-with-in-statement-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "for-loop-with-in-statement.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    6
+                                ],
+                                "name": "for-loop-with-in-statement.js",
+                                "end": [
+                                    1,
+                                    14
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    6
+                                ],
+                                "name": "for-loop-with-in-statement.js",
+                                "end": [
+                                    1,
+                                    9
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'otherKey' identifier with the 'key' identifier",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    52
+                                ],
+                                "name": "for-loop-with-in-statement.js",
+                                "end": [
+                                    1,
+                                    68
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    47
+                                ],
+                                "name": "for-loop-with-in-statement.js",
+                                "end": [
+                                    1,
+                                    58
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'doOtherSomething' identifier with the 'doSomething' identifier in the doSomething() function call",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "for-loop-with-in-statement.js"
+    ],
+    "sha1": "586a2c3efd9651e7be12ec5ef857b734daffea6a",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "fd27e1f30fd033a46ad5102fdcb5505937975f3d"
+}
+,{
+    "testCaseDescription": "javascript-for-loop-with-in-statement-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "for-loop-with-in-statement.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    6
+                                ],
+                                "name": "for-loop-with-in-statement.js",
+                                "end": [
+                                    1,
+                                    9
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    6
+                                ],
+                                "name": "for-loop-with-in-statement.js",
+                                "end": [
+                                    1,
+                                    14
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'key' identifier with the 'otherKey' identifier",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    47
+                                ],
+                                "name": "for-loop-with-in-statement.js",
+                                "end": [
+                                    1,
+                                    58
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    52
+                                ],
+                                "name": "for-loop-with-in-statement.js",
+                                "end": [
+                                    1,
+                                    68
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'doSomething' identifier with the 'doOtherSomething' identifier in the doOtherSomething() function call",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "for-loop-with-in-statement.js"
+    ],
+    "sha1": "fd27e1f30fd033a46ad5102fdcb5505937975f3d",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "39740a3c6176bf3db5c3574e1c6ca84608c315b1"
+}
+,{
+    "testCaseDescription": "javascript-for-loop-with-in-statement-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "for-loop-with-in-statement.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "for-loop-with-in-statement.js",
+                            "end": [
+                                1,
+                                73
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'otherKey in something && i = 0; i < n; i++' for statement",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "for-loop-with-in-statement.js",
+                            "end": [
+                                2,
+                                63
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'key in something && i = 0; i < n; i++' for statement",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "for-loop-with-in-statement.js",
+                            "end": [
+                                2,
+                                73
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'otherKey in something && i = 0; i < n; i++' for statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "for-loop-with-in-statement.js"
+    ],
+    "sha1": "39740a3c6176bf3db5c3574e1c6ca84608c315b1",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "f438ed3707daff81f5e48c2726e9008707dd8a5a"
+}
+,{
+    "testCaseDescription": "javascript-for-loop-with-in-statement-delete-test",
+    "expectedResult": {
+        "changes": {
+            "for-loop-with-in-statement.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "for-loop-with-in-statement.js",
+                            "end": [
+                                1,
+                                63
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'key in something && i = 0; i < n; i++' for statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "for-loop-with-in-statement.js"
+    ],
+    "sha1": "f438ed3707daff81f5e48c2726e9008707dd8a5a",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "90ed63f4489e99976afa912f90bfe0a3d89a7389"
+}
+,{
+    "testCaseDescription": "javascript-for-loop-with-in-statement-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "for-loop-with-in-statement.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "for-loop-with-in-statement.js",
+                            "end": [
+                                1,
+                                73
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'otherKey in something && i = 0; i < n; i++' for statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "for-loop-with-in-statement.js"
+    ],
+    "sha1": "90ed63f4489e99976afa912f90bfe0a3d89a7389",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "0ba7c6b1f1b67daa1a4bea6a573c1b80be0cfbbc"
+}]

test/corpus/diff-summaries/javascript/for-of-statement.json

@@ -0,0 +1,428 @@
+[{
+    "testCaseDescription": "javascript-for-of-statement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "for-of-statement.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "for-of-statement.js",
+                            "end": [
+                                1,
+                                43
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'item of items' for statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "for-of-statement.js"
+    ],
+    "sha1": "0ba7c6b1f1b67daa1a4bea6a573c1b80be0cfbbc",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "3d1449a3bc07b4ff653184c77efcc7eb72dd524c"
+}
+,{
+    "testCaseDescription": "javascript-for-of-statement-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "for-of-statement.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "for-of-statement.js",
+                            "end": [
+                                1,
+                                46
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'thing of things' for statement",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "for-of-statement.js",
+                            "end": [
+                                2,
+                                43
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'item of items' for statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "for-of-statement.js"
+    ],
+    "sha1": "3d1449a3bc07b4ff653184c77efcc7eb72dd524c",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "31112575f86e94f481e6eb6d74dabbfef5cf8ac6"
+}
+,{
+    "testCaseDescription": "javascript-for-of-statement-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "for-of-statement.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    10
+                                ],
+                                "name": "for-of-statement.js",
+                                "end": [
+                                    1,
+                                    15
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    10
+                                ],
+                                "name": "for-of-statement.js",
+                                "end": [
+                                    1,
+                                    14
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'thing' identifier with the 'item' identifier",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    19
+                                ],
+                                "name": "for-of-statement.js",
+                                "end": [
+                                    1,
+                                    25
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    18
+                                ],
+                                "name": "for-of-statement.js",
+                                "end": [
+                                    1,
+                                    23
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'things' identifier with the 'items' identifier",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    37
+                                ],
+                                "name": "for-of-statement.js",
+                                "end": [
+                                    1,
+                                    42
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    35
+                                ],
+                                "name": "for-of-statement.js",
+                                "end": [
+                                    1,
+                                    39
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'thing' identifier with the 'item' identifier in the process(item) function call",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "for-of-statement.js"
+    ],
+    "sha1": "31112575f86e94f481e6eb6d74dabbfef5cf8ac6",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "bd5d2e141cbee15d933dcfe3eecf04cdda94f256"
+}
+,{
+    "testCaseDescription": "javascript-for-of-statement-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "for-of-statement.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    10
+                                ],
+                                "name": "for-of-statement.js",
+                                "end": [
+                                    1,
+                                    14
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    10
+                                ],
+                                "name": "for-of-statement.js",
+                                "end": [
+                                    1,
+                                    15
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'item' identifier with the 'thing' identifier",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    18
+                                ],
+                                "name": "for-of-statement.js",
+                                "end": [
+                                    1,
+                                    23
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    19
+                                ],
+                                "name": "for-of-statement.js",
+                                "end": [
+                                    1,
+                                    25
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'items' identifier with the 'things' identifier",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    35
+                                ],
+                                "name": "for-of-statement.js",
+                                "end": [
+                                    1,
+                                    39
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    37
+                                ],
+                                "name": "for-of-statement.js",
+                                "end": [
+                                    1,
+                                    42
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'item' identifier with the 'thing' identifier in the process(thing) function call",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "for-of-statement.js"
+    ],
+    "sha1": "bd5d2e141cbee15d933dcfe3eecf04cdda94f256",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "e868cdc733c04e540ccca5a4fd9b29055ff48b89"
+}
+,{
+    "testCaseDescription": "javascript-for-of-statement-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "for-of-statement.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "for-of-statement.js",
+                            "end": [
+                                1,
+                                46
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'thing of things' for statement",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "for-of-statement.js",
+                            "end": [
+                                2,
+                                43
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'item of items' for statement",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "for-of-statement.js",
+                            "end": [
+                                2,
+                                46
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'thing of things' for statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "for-of-statement.js"
+    ],
+    "sha1": "e868cdc733c04e540ccca5a4fd9b29055ff48b89",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "eaa9c7d29fd865d30edc381723685ce4bdd3b3c0"
+}
+,{
+    "testCaseDescription": "javascript-for-of-statement-delete-test",
+    "expectedResult": {
+        "changes": {
+            "for-of-statement.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "for-of-statement.js",
+                            "end": [
+                                1,
+                                43
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'item of items' for statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "for-of-statement.js"
+    ],
+    "sha1": "eaa9c7d29fd865d30edc381723685ce4bdd3b3c0",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "96274519618035299d535a46b5a9b09a88c624de"
+}
+,{
+    "testCaseDescription": "javascript-for-of-statement-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "for-of-statement.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "for-of-statement.js",
+                            "end": [
+                                1,
+                                46
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'thing of things' for statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "for-of-statement.js"
+    ],
+    "sha1": "96274519618035299d535a46b5a9b09a88c624de",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "1e95946698829d93a91686c01b91618eb065b077"
+}]

test/corpus/diff-summaries/javascript/for-statement.json

@@ -0,0 +1,308 @@
+[{
+    "testCaseDescription": "javascript-for-statement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "for-statement.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "for-statement.js",
+                            "end": [
+                                1,
+                                45
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'i = 0, init(); i < 10; i++' for statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "for-statement.js"
+    ],
+    "sha1": "761990749004312c4b5e474eeacb839376523f0b",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "720e97a0bc939ae883e7bbe18a84f02b8abeeb7a"
+}
+,{
+    "testCaseDescription": "javascript-for-statement-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "for-statement.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "for-statement.js",
+                            "end": [
+                                1,
+                                46
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'i = 0, init(); i < 100; i++' for statement",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "for-statement.js",
+                            "end": [
+                                2,
+                                45
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'i = 0, init(); i < 10; i++' for statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "for-statement.js"
+    ],
+    "sha1": "720e97a0bc939ae883e7bbe18a84f02b8abeeb7a",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "f4a0a3f223f66ace49c2e2894579639324035b85"
+}
+,{
+    "testCaseDescription": "javascript-for-statement-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "for-statement.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    25
+                                ],
+                                "name": "for-statement.js",
+                                "end": [
+                                    1,
+                                    28
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    25
+                                ],
+                                "name": "for-statement.js",
+                                "end": [
+                                    1,
+                                    27
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced '100' with '10'",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "for-statement.js"
+    ],
+    "sha1": "f4a0a3f223f66ace49c2e2894579639324035b85",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "b7aa4657257e1ff7e9018ca951c22d9c08f4ca5b"
+}
+,{
+    "testCaseDescription": "javascript-for-statement-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "for-statement.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    25
+                                ],
+                                "name": "for-statement.js",
+                                "end": [
+                                    1,
+                                    27
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    25
+                                ],
+                                "name": "for-statement.js",
+                                "end": [
+                                    1,
+                                    28
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced '10' with '100'",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "for-statement.js"
+    ],
+    "sha1": "b7aa4657257e1ff7e9018ca951c22d9c08f4ca5b",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "d90fd03838f2ae92733c5d13db56c51f4dded714"
+}
+,{
+    "testCaseDescription": "javascript-for-statement-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "for-statement.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "for-statement.js",
+                            "end": [
+                                1,
+                                46
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'i = 0, init(); i < 100; i++' for statement",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "for-statement.js",
+                            "end": [
+                                2,
+                                45
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'i = 0, init(); i < 10; i++' for statement",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "for-statement.js",
+                            "end": [
+                                2,
+                                46
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'i = 0, init(); i < 100; i++' for statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "for-statement.js"
+    ],
+    "sha1": "d90fd03838f2ae92733c5d13db56c51f4dded714",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "6a61a685e17ba55bf3982bab2b696346df632862"
+}
+,{
+    "testCaseDescription": "javascript-for-statement-delete-test",
+    "expectedResult": {
+        "changes": {
+            "for-statement.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "for-statement.js",
+                            "end": [
+                                1,
+                                45
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'i = 0, init(); i < 10; i++' for statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "for-statement.js"
+    ],
+    "sha1": "6a61a685e17ba55bf3982bab2b696346df632862",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "2bdadc3ac8ea4e15f6f2d7b4a9d1d2cf3b0a9567"
+}
+,{
+    "testCaseDescription": "javascript-for-statement-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "for-statement.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "for-statement.js",
+                            "end": [
+                                1,
+                                46
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'i = 0, init(); i < 100; i++' for statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "for-statement.js"
+    ],
+    "sha1": "2bdadc3ac8ea4e15f6f2d7b4a9d1d2cf3b0a9567",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "e66aa2b6bacc2bbd796427540227b298518b1389"
+}]

test/corpus/diff-summaries/javascript/function-call-args.json

@@ -0,0 +1,608 @@
+[{
+    "testCaseDescription": "javascript-function-call-args-insert-test",
+    "expectedResult": {
+        "changes": {
+            "function-call-args.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "function-call-args.js",
+                            "end": [
+                                1,
+                                77
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'someFunction(1, \"string\", …, true)' function call",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "function-call-args.js"
+    ],
+    "sha1": "101b21dd5ae54a69443d6899a30f575b0500e085",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "0dc5c6df87d1ae60a9b4195126f2b0c70eecfc6e"
+}
+,{
+    "testCaseDescription": "javascript-function-call-args-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "function-call-args.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "function-call-args.js",
+                            "end": [
+                                1,
+                                83
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'someFunction(1, \"otherString\", …, false)' function call",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "function-call-args.js",
+                            "end": [
+                                2,
+                                77
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'someFunction(1, \"string\", …, true)' function call",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "function-call-args.js"
+    ],
+    "sha1": "0dc5c6df87d1ae60a9b4195126f2b0c70eecfc6e",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "a10b3fa59ae8e50c1c0d6bc1a341eb31b41c6a9f"
+}
+,{
+    "testCaseDescription": "javascript-function-call-args-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "function-call-args.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    17
+                                ],
+                                "name": "function-call-args.js",
+                                "end": [
+                                    1,
+                                    30
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    17
+                                ],
+                                "name": "function-call-args.js",
+                                "end": [
+                                    1,
+                                    25
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the \"otherString\" string with the \"string\" string in the someFunction(1, \"string\", …, true) function call",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    41
+                                ],
+                                "name": "function-call-args.js",
+                                "end": [
+                                    1,
+                                    42
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    36
+                                ],
+                                "name": "function-call-args.js",
+                                "end": [
+                                    1,
+                                    37
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'b' identifier with the 'a' identifier in the someFunction(1, \"string\", …, true) function call",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    43
+                                ],
+                                "name": "function-call-args.js",
+                                "end": [
+                                    1,
+                                    44
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    38
+                                ],
+                                "name": "function-call-args.js",
+                                "end": [
+                                    1,
+                                    39
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'c' identifier with the 'b' identifier in the someFunction(1, \"string\", …, true) function call",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    60
+                                ],
+                                "name": "function-call-args.js",
+                                "end": [
+                                    1,
+                                    61
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    55
+                                ],
+                                "name": "function-call-args.js",
+                                "end": [
+                                    1,
+                                    56
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'b' identifier with the 'a' identifier in the console.log(a) method call",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    71
+                                ],
+                                "name": "function-call-args.js",
+                                "end": [
+                                    1,
+                                    72
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    66
+                                ],
+                                "name": "function-call-args.js",
+                                "end": [
+                                    1,
+                                    67
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'c' identifier with the 'b' identifier in the someFunction(1, \"string\", …, true) function call",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    77
+                                ],
+                                "name": "function-call-args.js",
+                                "end": [
+                                    1,
+                                    82
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    72
+                                ],
+                                "name": "function-call-args.js",
+                                "end": [
+                                    1,
+                                    76
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced 'false' with 'true' in the someFunction(1, \"string\", …, true) function call",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "function-call-args.js"
+    ],
+    "sha1": "a10b3fa59ae8e50c1c0d6bc1a341eb31b41c6a9f",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "940f6218f550757ae9d53a05ffe7d1893ceb085a"
+}
+,{
+    "testCaseDescription": "javascript-function-call-args-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "function-call-args.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    17
+                                ],
+                                "name": "function-call-args.js",
+                                "end": [
+                                    1,
+                                    25
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    17
+                                ],
+                                "name": "function-call-args.js",
+                                "end": [
+                                    1,
+                                    30
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the \"string\" string with the \"otherString\" string in the someFunction(1, \"otherString\", …, false) function call",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    36
+                                ],
+                                "name": "function-call-args.js",
+                                "end": [
+                                    1,
+                                    37
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    41
+                                ],
+                                "name": "function-call-args.js",
+                                "end": [
+                                    1,
+                                    42
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'a' identifier with the 'b' identifier in the someFunction(1, \"otherString\", …, false) function call",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    38
+                                ],
+                                "name": "function-call-args.js",
+                                "end": [
+                                    1,
+                                    39
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    43
+                                ],
+                                "name": "function-call-args.js",
+                                "end": [
+                                    1,
+                                    44
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'b' identifier with the 'c' identifier in the someFunction(1, \"otherString\", …, false) function call",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    55
+                                ],
+                                "name": "function-call-args.js",
+                                "end": [
+                                    1,
+                                    56
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    60
+                                ],
+                                "name": "function-call-args.js",
+                                "end": [
+                                    1,
+                                    61
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'a' identifier with the 'b' identifier in the console.log(b) method call",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    66
+                                ],
+                                "name": "function-call-args.js",
+                                "end": [
+                                    1,
+                                    67
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    71
+                                ],
+                                "name": "function-call-args.js",
+                                "end": [
+                                    1,
+                                    72
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'b' identifier with the 'c' identifier in the someFunction(1, \"otherString\", …, false) function call",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    72
+                                ],
+                                "name": "function-call-args.js",
+                                "end": [
+                                    1,
+                                    76
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    77
+                                ],
+                                "name": "function-call-args.js",
+                                "end": [
+                                    1,
+                                    82
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced 'true' with 'false' in the someFunction(1, \"otherString\", …, false) function call",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "function-call-args.js"
+    ],
+    "sha1": "940f6218f550757ae9d53a05ffe7d1893ceb085a",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "7efa824b428048d98a2183fb8704105e37e8ac6e"
+}
+,{
+    "testCaseDescription": "javascript-function-call-args-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "function-call-args.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "function-call-args.js",
+                            "end": [
+                                1,
+                                83
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'someFunction(1, \"otherString\", …, false)' function call",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "function-call-args.js",
+                            "end": [
+                                2,
+                                77
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'someFunction(1, \"string\", …, true)' function call",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "function-call-args.js",
+                            "end": [
+                                2,
+                                83
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'someFunction(1, \"otherString\", …, false)' function call",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "function-call-args.js"
+    ],
+    "sha1": "7efa824b428048d98a2183fb8704105e37e8ac6e",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "375b6403b1b7e5fe2c26b799eeb8a097ae63c749"
+}
+,{
+    "testCaseDescription": "javascript-function-call-args-delete-test",
+    "expectedResult": {
+        "changes": {
+            "function-call-args.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "function-call-args.js",
+                            "end": [
+                                1,
+                                77
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'someFunction(1, \"string\", …, true)' function call",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "function-call-args.js"
+    ],
+    "sha1": "375b6403b1b7e5fe2c26b799eeb8a097ae63c749",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "62375666f152e860d0bdffdb49dcb981c5e77a1e"
+}
+,{
+    "testCaseDescription": "javascript-function-call-args-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "function-call-args.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "function-call-args.js",
+                            "end": [
+                                1,
+                                83
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'someFunction(1, \"otherString\", …, false)' function call",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "function-call-args.js"
+    ],
+    "sha1": "62375666f152e860d0bdffdb49dcb981c5e77a1e",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "e5315f0371489f42d527c318faa1406833bb3c86"
+}]

test/corpus/diff-summaries/javascript/function-call.json

@@ -0,0 +1,308 @@
+[{
+    "testCaseDescription": "javascript-function-call-insert-test",
+    "expectedResult": {
+        "changes": {
+            "function-call.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "function-call.js",
+                            "end": [
+                                1,
+                                27
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'someFunction(arg1, \"arg2\")' function call",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "function-call.js"
+    ],
+    "sha1": "cf31ddf834d011d1d55eee3da85c70f15eea67f1",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "67d53107901a801fcd3027e5e0e5aae18fb2ca36"
+}
+,{
+    "testCaseDescription": "javascript-function-call-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "function-call.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "function-call.js",
+                            "end": [
+                                1,
+                                27
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'someFunction(arg1, \"arg3\")' function call",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "function-call.js",
+                            "end": [
+                                2,
+                                27
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'someFunction(arg1, \"arg2\")' function call",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "function-call.js"
+    ],
+    "sha1": "67d53107901a801fcd3027e5e0e5aae18fb2ca36",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "211596a53308346f468fe8ed76ace3ce30ddf4da"
+}
+,{
+    "testCaseDescription": "javascript-function-call-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "function-call.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    20
+                                ],
+                                "name": "function-call.js",
+                                "end": [
+                                    1,
+                                    26
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    20
+                                ],
+                                "name": "function-call.js",
+                                "end": [
+                                    1,
+                                    26
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the \"arg3\" string with the \"arg2\" string in the someFunction(arg1, \"arg2\") function call",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "function-call.js"
+    ],
+    "sha1": "211596a53308346f468fe8ed76ace3ce30ddf4da",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "fd80aa4f89fad9074132808237e195a8d9545b86"
+}
+,{
+    "testCaseDescription": "javascript-function-call-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "function-call.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    20
+                                ],
+                                "name": "function-call.js",
+                                "end": [
+                                    1,
+                                    26
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    20
+                                ],
+                                "name": "function-call.js",
+                                "end": [
+                                    1,
+                                    26
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the \"arg2\" string with the \"arg3\" string in the someFunction(arg1, \"arg3\") function call",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "function-call.js"
+    ],
+    "sha1": "fd80aa4f89fad9074132808237e195a8d9545b86",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "9f9c596f918e7d7c6a538e6213855683eccd9dd7"
+}
+,{
+    "testCaseDescription": "javascript-function-call-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "function-call.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "function-call.js",
+                            "end": [
+                                1,
+                                27
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'someFunction(arg1, \"arg3\")' function call",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "function-call.js",
+                            "end": [
+                                2,
+                                27
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'someFunction(arg1, \"arg2\")' function call",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "function-call.js",
+                            "end": [
+                                2,
+                                27
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'someFunction(arg1, \"arg3\")' function call",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "function-call.js"
+    ],
+    "sha1": "9f9c596f918e7d7c6a538e6213855683eccd9dd7",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "044ad612c7ddae2a92516fa81c38fe337f45f44b"
+}
+,{
+    "testCaseDescription": "javascript-function-call-delete-test",
+    "expectedResult": {
+        "changes": {
+            "function-call.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "function-call.js",
+                            "end": [
+                                1,
+                                27
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'someFunction(arg1, \"arg2\")' function call",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "function-call.js"
+    ],
+    "sha1": "044ad612c7ddae2a92516fa81c38fe337f45f44b",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "245fd4ed85aa4fbcecaca43247ca77efa8382c34"
+}
+,{
+    "testCaseDescription": "javascript-function-call-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "function-call.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "function-call.js",
+                            "end": [
+                                1,
+                                27
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'someFunction(arg1, \"arg3\")' function call",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "function-call.js"
+    ],
+    "sha1": "245fd4ed85aa4fbcecaca43247ca77efa8382c34",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "1057513972364b1ca48ee19f74fb73ca06119e8c"
+}]

test/corpus/diff-summaries/javascript/function.json

@@ -0,0 +1,308 @@
+[{
+    "testCaseDescription": "javascript-function-insert-test",
+    "expectedResult": {
+        "changes": {
+            "function.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "function.js",
+                            "end": [
+                                1,
+                                31
+                            ]
+                        }
+                    },
+                    "summary": "Added an anonymous(arg1, arg2) function",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "function.js"
+    ],
+    "sha1": "492ece78ac243f74d0f0bfce83c94b7162c1eaa6",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "a1e7c18328813b605f462f8909d48f17a8e0143b"
+}
+,{
+    "testCaseDescription": "javascript-function-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "function.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "function.js",
+                            "end": [
+                                1,
+                                31
+                            ]
+                        }
+                    },
+                    "summary": "Added an anonymous(arg1, arg2) function",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "function.js",
+                            "end": [
+                                2,
+                                31
+                            ]
+                        }
+                    },
+                    "summary": "Added an anonymous(arg1, arg2) function",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "function.js"
+    ],
+    "sha1": "a1e7c18328813b605f462f8909d48f17a8e0143b",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "2bf863a59e774f4350a3cdd80cf5dc5a491b7c7c"
+}
+,{
+    "testCaseDescription": "javascript-function-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "function.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    24
+                                ],
+                                "name": "function.js",
+                                "end": [
+                                    1,
+                                    28
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    24
+                                ],
+                                "name": "function.js",
+                                "end": [
+                                    1,
+                                    28
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'arg1' identifier with the 'arg2' identifier",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "function.js"
+    ],
+    "sha1": "2bf863a59e774f4350a3cdd80cf5dc5a491b7c7c",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "ccdde180a122687c848a953946552ab2e0e85f19"
+}
+,{
+    "testCaseDescription": "javascript-function-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "function.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    24
+                                ],
+                                "name": "function.js",
+                                "end": [
+                                    1,
+                                    28
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    24
+                                ],
+                                "name": "function.js",
+                                "end": [
+                                    1,
+                                    28
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'arg2' identifier with the 'arg1' identifier",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "function.js"
+    ],
+    "sha1": "ccdde180a122687c848a953946552ab2e0e85f19",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "2fc4cc2b1dd48ca880339b2e7bdcb80aa8474eab"
+}
+,{
+    "testCaseDescription": "javascript-function-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "function.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "function.js",
+                            "end": [
+                                1,
+                                31
+                            ]
+                        }
+                    },
+                    "summary": "Deleted an anonymous(arg1, arg2) function",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "function.js",
+                            "end": [
+                                2,
+                                31
+                            ]
+                        }
+                    },
+                    "summary": "Deleted an anonymous(arg1, arg2) function",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "function.js",
+                            "end": [
+                                2,
+                                31
+                            ]
+                        }
+                    },
+                    "summary": "Added an anonymous(arg1, arg2) function",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "function.js"
+    ],
+    "sha1": "2fc4cc2b1dd48ca880339b2e7bdcb80aa8474eab",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "265e835586016a3afaf60e97b0953a0e63a5908c"
+}
+,{
+    "testCaseDescription": "javascript-function-delete-test",
+    "expectedResult": {
+        "changes": {
+            "function.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "function.js",
+                            "end": [
+                                1,
+                                31
+                            ]
+                        }
+                    },
+                    "summary": "Deleted an anonymous(arg1, arg2) function",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "function.js"
+    ],
+    "sha1": "265e835586016a3afaf60e97b0953a0e63a5908c",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "9a2c09c340bccbd2ea80dbf353014da199f45840"
+}
+,{
+    "testCaseDescription": "javascript-function-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "function.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "function.js",
+                            "end": [
+                                1,
+                                31
+                            ]
+                        }
+                    },
+                    "summary": "Deleted an anonymous(arg1, arg2) function",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "function.js"
+    ],
+    "sha1": "9a2c09c340bccbd2ea80dbf353014da199f45840",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "142158e6e72a9a884b0d89c0b044b5c1473248db"
+}]

test/corpus/diff-summaries/javascript/generator-function.json

@@ -0,0 +1,308 @@
+[{
+    "testCaseDescription": "javascript-generator-function-insert-test",
+    "expectedResult": {
+        "changes": {
+            "generator-function.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "generator-function.js",
+                            "end": [
+                                1,
+                                59
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'generateStuff' function",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "generator-function.js"
+    ],
+    "sha1": "304e0c432994c642daa18c284f4c1578416e77e1",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "a1f2e1505ff20196ae782ad0d4c5001bc2cc8cb1"
+}
+,{
+    "testCaseDescription": "javascript-generator-function-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "generator-function.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "generator-function.js",
+                            "end": [
+                                1,
+                                62
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'generateNewStuff' function",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "generator-function.js",
+                            "end": [
+                                2,
+                                59
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'generateStuff' function",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "generator-function.js"
+    ],
+    "sha1": "a1f2e1505ff20196ae782ad0d4c5001bc2cc8cb1",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "b4ca6466eb43270aca0908d03a0185180dc75011"
+}
+,{
+    "testCaseDescription": "javascript-generator-function-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "generator-function.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    11
+                                ],
+                                "name": "generator-function.js",
+                                "end": [
+                                    1,
+                                    27
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    11
+                                ],
+                                "name": "generator-function.js",
+                                "end": [
+                                    1,
+                                    24
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'generateNewStuff' identifier with the 'generateStuff' identifier in the generateStuff function",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "generator-function.js"
+    ],
+    "sha1": "b4ca6466eb43270aca0908d03a0185180dc75011",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "c3a19c5bd3d78102ef15c6a49e8063940d9511ee"
+}
+,{
+    "testCaseDescription": "javascript-generator-function-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "generator-function.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    11
+                                ],
+                                "name": "generator-function.js",
+                                "end": [
+                                    1,
+                                    24
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    11
+                                ],
+                                "name": "generator-function.js",
+                                "end": [
+                                    1,
+                                    27
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'generateStuff' identifier with the 'generateNewStuff' identifier in the generateNewStuff function",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "generator-function.js"
+    ],
+    "sha1": "c3a19c5bd3d78102ef15c6a49e8063940d9511ee",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "1d4670fa514b6e44c62cabb9de4cd8c565ac04ee"
+}
+,{
+    "testCaseDescription": "javascript-generator-function-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "generator-function.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "generator-function.js",
+                            "end": [
+                                1,
+                                62
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'generateNewStuff' function",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "generator-function.js",
+                            "end": [
+                                2,
+                                59
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'generateStuff' function",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "generator-function.js",
+                            "end": [
+                                2,
+                                62
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'generateNewStuff' function",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "generator-function.js"
+    ],
+    "sha1": "1d4670fa514b6e44c62cabb9de4cd8c565ac04ee",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "a3f49a301897c265545ecb113bfdc96850ca29f1"
+}
+,{
+    "testCaseDescription": "javascript-generator-function-delete-test",
+    "expectedResult": {
+        "changes": {
+            "generator-function.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "generator-function.js",
+                            "end": [
+                                1,
+                                59
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'generateStuff' function",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "generator-function.js"
+    ],
+    "sha1": "a3f49a301897c265545ecb113bfdc96850ca29f1",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "6d10fc13004f3500329c6bbae82678004ac0a103"
+}
+,{
+    "testCaseDescription": "javascript-generator-function-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "generator-function.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "generator-function.js",
+                            "end": [
+                                1,
+                                62
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'generateNewStuff' function",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "generator-function.js"
+    ],
+    "sha1": "6d10fc13004f3500329c6bbae82678004ac0a103",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "2f00ecb14d10a4cc210b7a56309fc75db90f3b64"
+}]

test/corpus/diff-summaries/javascript/identifier.json

@@ -0,0 +1,308 @@
+[{
+    "testCaseDescription": "javascript-identifier-insert-test",
+    "expectedResult": {
+        "changes": {
+            "identifier.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "identifier.js",
+                            "end": [
+                                1,
+                                7
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'theVar' identifier",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "identifier.js"
+    ],
+    "sha1": "e117ae3f5e0945e0d8e971f7bbc0397229a45648",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "0e588d86e85373e48c2f0698ec1f04561b9a24e2"
+}
+,{
+    "testCaseDescription": "javascript-identifier-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "identifier.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "identifier.js",
+                            "end": [
+                                1,
+                                8
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'theVar2' identifier",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "identifier.js",
+                            "end": [
+                                2,
+                                7
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'theVar' identifier",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "identifier.js"
+    ],
+    "sha1": "0e588d86e85373e48c2f0698ec1f04561b9a24e2",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "304194727ea2932362b0d03d8f79a362974303ad"
+}
+,{
+    "testCaseDescription": "javascript-identifier-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "identifier.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    1
+                                ],
+                                "name": "identifier.js",
+                                "end": [
+                                    1,
+                                    8
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    1
+                                ],
+                                "name": "identifier.js",
+                                "end": [
+                                    1,
+                                    7
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'theVar2' identifier with the 'theVar' identifier",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "identifier.js"
+    ],
+    "sha1": "304194727ea2932362b0d03d8f79a362974303ad",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "17438bcefeb350651ad9c920c65e6b8d21f3c157"
+}
+,{
+    "testCaseDescription": "javascript-identifier-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "identifier.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    1
+                                ],
+                                "name": "identifier.js",
+                                "end": [
+                                    1,
+                                    7
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    1
+                                ],
+                                "name": "identifier.js",
+                                "end": [
+                                    1,
+                                    8
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'theVar' identifier with the 'theVar2' identifier",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "identifier.js"
+    ],
+    "sha1": "17438bcefeb350651ad9c920c65e6b8d21f3c157",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "db1afa5037ec331c9d2a490ec2c6052ed06235f8"
+}
+,{
+    "testCaseDescription": "javascript-identifier-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "identifier.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "identifier.js",
+                            "end": [
+                                1,
+                                8
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'theVar2' identifier",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "identifier.js",
+                            "end": [
+                                2,
+                                7
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'theVar' identifier",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "identifier.js",
+                            "end": [
+                                2,
+                                8
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'theVar2' identifier",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "identifier.js"
+    ],
+    "sha1": "db1afa5037ec331c9d2a490ec2c6052ed06235f8",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "ab62284a2d89f526cdde80ad60e4f448a2376bed"
+}
+,{
+    "testCaseDescription": "javascript-identifier-delete-test",
+    "expectedResult": {
+        "changes": {
+            "identifier.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "identifier.js",
+                            "end": [
+                                1,
+                                7
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'theVar' identifier",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "identifier.js"
+    ],
+    "sha1": "ab62284a2d89f526cdde80ad60e4f448a2376bed",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "063615a0cbe20132f23e2f4ec74c4c10658840c6"
+}
+,{
+    "testCaseDescription": "javascript-identifier-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "identifier.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "identifier.js",
+                            "end": [
+                                1,
+                                8
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'theVar2' identifier",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "identifier.js"
+    ],
+    "sha1": "063615a0cbe20132f23e2f4ec74c4c10658840c6",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "ebab90bd29d724f6dda4d39a32a6fa7d0b9adf52"
+}]

test/corpus/diff-summaries/javascript/if-else.json

@@ -0,0 +1,308 @@
+[{
+    "testCaseDescription": "javascript-if-else-insert-test",
+    "expectedResult": {
+        "changes": {
+            "if-else.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "if-else.js",
+                            "end": [
+                                1,
+                                25
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'x' if statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "if-else.js"
+    ],
+    "sha1": "805427c7aaf71a887c429562b647fe6811ba39c9",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "46ab86718f54c48cd2f565a432f4187de5bc0fbe"
+}
+,{
+    "testCaseDescription": "javascript-if-else-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "if-else.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "if-else.js",
+                            "end": [
+                                1,
+                                29
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'a' if statement",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "if-else.js",
+                            "end": [
+                                2,
+                                25
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'x' if statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "if-else.js"
+    ],
+    "sha1": "46ab86718f54c48cd2f565a432f4187de5bc0fbe",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "111b0fa6c30be41e42f49a8b97734c2f29ffe887"
+}
+,{
+    "testCaseDescription": "javascript-if-else-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "if-else.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    1
+                                ],
+                                "name": "if-else.js",
+                                "end": [
+                                    1,
+                                    29
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    1
+                                ],
+                                "name": "if-else.js",
+                                "end": [
+                                    1,
+                                    25
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'a' if statement with the 'x' if statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "if-else.js"
+    ],
+    "sha1": "111b0fa6c30be41e42f49a8b97734c2f29ffe887",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "86bcc1f27f5c8d1108c1fd41681db0786ce40577"
+}
+,{
+    "testCaseDescription": "javascript-if-else-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "if-else.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    1
+                                ],
+                                "name": "if-else.js",
+                                "end": [
+                                    1,
+                                    25
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    1
+                                ],
+                                "name": "if-else.js",
+                                "end": [
+                                    1,
+                                    29
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'x' if statement with the 'a' if statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "if-else.js"
+    ],
+    "sha1": "86bcc1f27f5c8d1108c1fd41681db0786ce40577",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "08b8b6246b046b2fa0a5b480bde9ea2a59496cab"
+}
+,{
+    "testCaseDescription": "javascript-if-else-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "if-else.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "if-else.js",
+                            "end": [
+                                1,
+                                29
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'a' if statement",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "if-else.js",
+                            "end": [
+                                2,
+                                25
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'x' if statement",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "if-else.js",
+                            "end": [
+                                2,
+                                29
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'a' if statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "if-else.js"
+    ],
+    "sha1": "08b8b6246b046b2fa0a5b480bde9ea2a59496cab",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "f3c6acb380e4f8baa60d7ea87e7d62bdfb6832ac"
+}
+,{
+    "testCaseDescription": "javascript-if-else-delete-test",
+    "expectedResult": {
+        "changes": {
+            "if-else.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "if-else.js",
+                            "end": [
+                                1,
+                                25
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'x' if statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "if-else.js"
+    ],
+    "sha1": "f3c6acb380e4f8baa60d7ea87e7d62bdfb6832ac",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "542ca4c9f7fdfd3e4660588a20f5cc7f40792166"
+}
+,{
+    "testCaseDescription": "javascript-if-else-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "if-else.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "if-else.js",
+                            "end": [
+                                1,
+                                29
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'a' if statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "if-else.js"
+    ],
+    "sha1": "542ca4c9f7fdfd3e4660588a20f5cc7f40792166",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "125f2e2e8e65a10784e72bb113319c805d4f42ac"
+}]

test/corpus/diff-summaries/javascript/if.json

@@ -0,0 +1,308 @@
+[{
+    "testCaseDescription": "javascript-if-insert-test",
+    "expectedResult": {
+        "changes": {
+            "if.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "if.js",
+                            "end": [
+                                1,
+                                19
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'x' if statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "if.js"
+    ],
+    "sha1": "408411b4e79d51cf3b50541c8d1115a3ce46dfa8",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "66188f5ab8580e98c37f0b8702e95544551be755"
+}
+,{
+    "testCaseDescription": "javascript-if-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "if.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "if.js",
+                            "end": [
+                                1,
+                                24
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'a.b' if statement",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "if.js",
+                            "end": [
+                                2,
+                                19
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'x' if statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "if.js"
+    ],
+    "sha1": "66188f5ab8580e98c37f0b8702e95544551be755",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "0293e32d52fc191e4a768a91746259c99acc2342"
+}
+,{
+    "testCaseDescription": "javascript-if-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "if.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    1
+                                ],
+                                "name": "if.js",
+                                "end": [
+                                    1,
+                                    24
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    1
+                                ],
+                                "name": "if.js",
+                                "end": [
+                                    1,
+                                    19
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'a.b' if statement with the 'x' if statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "if.js"
+    ],
+    "sha1": "0293e32d52fc191e4a768a91746259c99acc2342",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "7dd98c9d586de0e61d3b80ac34fe25e4f89cab42"
+}
+,{
+    "testCaseDescription": "javascript-if-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "if.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    1
+                                ],
+                                "name": "if.js",
+                                "end": [
+                                    1,
+                                    19
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    1
+                                ],
+                                "name": "if.js",
+                                "end": [
+                                    1,
+                                    24
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'x' if statement with the 'a.b' if statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "if.js"
+    ],
+    "sha1": "7dd98c9d586de0e61d3b80ac34fe25e4f89cab42",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "9a8f836a101bdd5418634b5e762b9db21a91011c"
+}
+,{
+    "testCaseDescription": "javascript-if-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "if.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "if.js",
+                            "end": [
+                                1,
+                                24
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'a.b' if statement",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "if.js",
+                            "end": [
+                                2,
+                                19
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'x' if statement",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "if.js",
+                            "end": [
+                                2,
+                                24
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'a.b' if statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "if.js"
+    ],
+    "sha1": "9a8f836a101bdd5418634b5e762b9db21a91011c",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "179c1b82b833c249afd123f342dfd06380b5acb8"
+}
+,{
+    "testCaseDescription": "javascript-if-delete-test",
+    "expectedResult": {
+        "changes": {
+            "if.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "if.js",
+                            "end": [
+                                1,
+                                19
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'x' if statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "if.js"
+    ],
+    "sha1": "179c1b82b833c249afd123f342dfd06380b5acb8",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "95123146ceab7cf639e49adb97d36a8556c19940"
+}
+,{
+    "testCaseDescription": "javascript-if-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "if.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "if.js",
+                            "end": [
+                                1,
+                                24
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'a.b' if statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "if.js"
+    ],
+    "sha1": "95123146ceab7cf639e49adb97d36a8556c19940",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "805427c7aaf71a887c429562b647fe6811ba39c9"
+}]

test/corpus/diff-summaries/javascript/math-assignment-operator.json

@@ -0,0 +1,308 @@
+[{
+    "testCaseDescription": "javascript-math-assignment-operator-insert-test",
+    "expectedResult": {
+        "changes": {
+            "math-assignment-operator.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "math-assignment-operator.js",
+                            "end": [
+                                1,
+                                7
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'x' math assignment",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "math-assignment-operator.js"
+    ],
+    "sha1": "74f192419bb6a3a7ef68bb5eb4cf71e89e09b919",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "d6da9771070c0da9787ae5e26c8914a45391d67b"
+}
+,{
+    "testCaseDescription": "javascript-math-assignment-operator-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "math-assignment-operator.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "math-assignment-operator.js",
+                            "end": [
+                                1,
+                                7
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'x' math assignment",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "math-assignment-operator.js",
+                            "end": [
+                                2,
+                                7
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'x' math assignment",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "math-assignment-operator.js"
+    ],
+    "sha1": "d6da9771070c0da9787ae5e26c8914a45391d67b",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "b817bac77a25047fc74bae958ac96e12e1f0a39e"
+}
+,{
+    "testCaseDescription": "javascript-math-assignment-operator-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "math-assignment-operator.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    6
+                                ],
+                                "name": "math-assignment-operator.js",
+                                "end": [
+                                    1,
+                                    7
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    6
+                                ],
+                                "name": "math-assignment-operator.js",
+                                "end": [
+                                    1,
+                                    7
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced '2' with '1' in the x math assignment",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "math-assignment-operator.js"
+    ],
+    "sha1": "b817bac77a25047fc74bae958ac96e12e1f0a39e",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "4fe543b5777c4b39ffdeb2a4492405adc704d764"
+}
+,{
+    "testCaseDescription": "javascript-math-assignment-operator-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "math-assignment-operator.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    6
+                                ],
+                                "name": "math-assignment-operator.js",
+                                "end": [
+                                    1,
+                                    7
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    6
+                                ],
+                                "name": "math-assignment-operator.js",
+                                "end": [
+                                    1,
+                                    7
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced '1' with '2' in the x math assignment",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "math-assignment-operator.js"
+    ],
+    "sha1": "4fe543b5777c4b39ffdeb2a4492405adc704d764",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "33afe3e3e1c77dabda9ec3e7b99f0c923bc23de5"
+}
+,{
+    "testCaseDescription": "javascript-math-assignment-operator-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "math-assignment-operator.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "math-assignment-operator.js",
+                            "end": [
+                                1,
+                                7
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'x' math assignment",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "math-assignment-operator.js",
+                            "end": [
+                                2,
+                                7
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'x' math assignment",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "math-assignment-operator.js",
+                            "end": [
+                                2,
+                                7
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'x' math assignment",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "math-assignment-operator.js"
+    ],
+    "sha1": "33afe3e3e1c77dabda9ec3e7b99f0c923bc23de5",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "3754066fb44624889e799c91af2a609fb1f1d27d"
+}
+,{
+    "testCaseDescription": "javascript-math-assignment-operator-delete-test",
+    "expectedResult": {
+        "changes": {
+            "math-assignment-operator.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "math-assignment-operator.js",
+                            "end": [
+                                1,
+                                7
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'x' math assignment",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "math-assignment-operator.js"
+    ],
+    "sha1": "3754066fb44624889e799c91af2a609fb1f1d27d",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "bd1b94d3f2bf9806becf43c7f18927e1ff3932ec"
+}
+,{
+    "testCaseDescription": "javascript-math-assignment-operator-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "math-assignment-operator.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "math-assignment-operator.js",
+                            "end": [
+                                1,
+                                7
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'x' math assignment",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "math-assignment-operator.js"
+    ],
+    "sha1": "bd1b94d3f2bf9806becf43c7f18927e1ff3932ec",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "faab59d023f70bb2d675e7d0671d36bc82dc9d0f"
+}]

test/corpus/diff-summaries/javascript/math-operator.json

@@ -0,0 +1,368 @@
+[{
+    "testCaseDescription": "javascript-math-operator-insert-test",
+    "expectedResult": {
+        "changes": {
+            "math-operator.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "math-operator.js",
+                            "end": [
+                                1,
+                                18
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'i + j * 3 - j % 5' math operator",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "math-operator.js"
+    ],
+    "sha1": "a871e92442fa237af75a13a311d49a15bcea9444",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "6e6e7267c1e6bc551379dbdf39e3d4ca59d4a60c"
+}
+,{
+    "testCaseDescription": "javascript-math-operator-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "math-operator.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "math-operator.js",
+                            "end": [
+                                1,
+                                18
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'i + j * 2 - j % 4' math operator",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "math-operator.js",
+                            "end": [
+                                2,
+                                18
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'i + j * 3 - j % 5' math operator",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "math-operator.js"
+    ],
+    "sha1": "6e6e7267c1e6bc551379dbdf39e3d4ca59d4a60c",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "bf33c9910dcfad10ffafd330c0adff6b7a7f262a"
+}
+,{
+    "testCaseDescription": "javascript-math-operator-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "math-operator.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    9
+                                ],
+                                "name": "math-operator.js",
+                                "end": [
+                                    1,
+                                    10
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    9
+                                ],
+                                "name": "math-operator.js",
+                                "end": [
+                                    1,
+                                    10
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced '2' with '3'",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    17
+                                ],
+                                "name": "math-operator.js",
+                                "end": [
+                                    1,
+                                    18
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    17
+                                ],
+                                "name": "math-operator.js",
+                                "end": [
+                                    1,
+                                    18
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced '4' with '5'",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "math-operator.js"
+    ],
+    "sha1": "bf33c9910dcfad10ffafd330c0adff6b7a7f262a",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "bd78c2dd93219f462c6a6823267bd327c14094db"
+}
+,{
+    "testCaseDescription": "javascript-math-operator-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "math-operator.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    9
+                                ],
+                                "name": "math-operator.js",
+                                "end": [
+                                    1,
+                                    10
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    9
+                                ],
+                                "name": "math-operator.js",
+                                "end": [
+                                    1,
+                                    10
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced '3' with '2'",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    17
+                                ],
+                                "name": "math-operator.js",
+                                "end": [
+                                    1,
+                                    18
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    17
+                                ],
+                                "name": "math-operator.js",
+                                "end": [
+                                    1,
+                                    18
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced '5' with '4'",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "math-operator.js"
+    ],
+    "sha1": "bd78c2dd93219f462c6a6823267bd327c14094db",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "413c0d316184bb443b4facd4aec46b4b04f0df71"
+}
+,{
+    "testCaseDescription": "javascript-math-operator-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "math-operator.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "math-operator.js",
+                            "end": [
+                                1,
+                                18
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'i + j * 2 - j % 4' math operator",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "math-operator.js",
+                            "end": [
+                                2,
+                                18
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'i + j * 3 - j % 5' math operator",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "math-operator.js",
+                            "end": [
+                                2,
+                                18
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'i + j * 2 - j % 4' math operator",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "math-operator.js"
+    ],
+    "sha1": "413c0d316184bb443b4facd4aec46b4b04f0df71",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "fb9ae3c73391e3158c898052fa343bb7bf98394b"
+}
+,{
+    "testCaseDescription": "javascript-math-operator-delete-test",
+    "expectedResult": {
+        "changes": {
+            "math-operator.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "math-operator.js",
+                            "end": [
+                                1,
+                                18
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'i + j * 3 - j % 5' math operator",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "math-operator.js"
+    ],
+    "sha1": "fb9ae3c73391e3158c898052fa343bb7bf98394b",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "9d2684586034ffe1cd50891ac950f9bc2bf40d2e"
+}
+,{
+    "testCaseDescription": "javascript-math-operator-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "math-operator.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "math-operator.js",
+                            "end": [
+                                1,
+                                18
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'i + j * 2 - j % 4' math operator",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "math-operator.js"
+    ],
+    "sha1": "9d2684586034ffe1cd50891ac950f9bc2bf40d2e",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "d7edfafd0028d88e036ad5af083bd4c0eaf821d5"
+}]

test/corpus/diff-summaries/javascript/member-access-assignment.json

@@ -0,0 +1,308 @@
+[{
+    "testCaseDescription": "javascript-member-access-assignment-insert-test",
+    "expectedResult": {
+        "changes": {
+            "member-access-assignment.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "member-access-assignment.js",
+                            "end": [
+                                1,
+                                8
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'y.x' assignment",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "member-access-assignment.js"
+    ],
+    "sha1": "24ea895fcb8c904a8d057c536eb56be4a8928e33",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "2b8bd487139dc144f01faab13961865c633bc0cd"
+}
+,{
+    "testCaseDescription": "javascript-member-access-assignment-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "member-access-assignment.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "member-access-assignment.js",
+                            "end": [
+                                1,
+                                8
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'y.x' assignment",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "member-access-assignment.js",
+                            "end": [
+                                2,
+                                8
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'y.x' assignment",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "member-access-assignment.js"
+    ],
+    "sha1": "2b8bd487139dc144f01faab13961865c633bc0cd",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "81f85cdb9f7a17a0560ee3e9d550eb3db0aaa739"
+}
+,{
+    "testCaseDescription": "javascript-member-access-assignment-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "member-access-assignment.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    7
+                                ],
+                                "name": "member-access-assignment.js",
+                                "end": [
+                                    1,
+                                    8
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    7
+                                ],
+                                "name": "member-access-assignment.js",
+                                "end": [
+                                    1,
+                                    8
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced '1' with '0' in an assignment to y.x",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "member-access-assignment.js"
+    ],
+    "sha1": "81f85cdb9f7a17a0560ee3e9d550eb3db0aaa739",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "30285e2a6c2057ad1af3e8475aa48d75c6e11199"
+}
+,{
+    "testCaseDescription": "javascript-member-access-assignment-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "member-access-assignment.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    7
+                                ],
+                                "name": "member-access-assignment.js",
+                                "end": [
+                                    1,
+                                    8
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    7
+                                ],
+                                "name": "member-access-assignment.js",
+                                "end": [
+                                    1,
+                                    8
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced '0' with '1' in an assignment to y.x",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "member-access-assignment.js"
+    ],
+    "sha1": "30285e2a6c2057ad1af3e8475aa48d75c6e11199",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "a2a7e40667563b5b73dcafcbb1e476e9bd2454ba"
+}
+,{
+    "testCaseDescription": "javascript-member-access-assignment-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "member-access-assignment.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "member-access-assignment.js",
+                            "end": [
+                                1,
+                                8
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'y.x' assignment",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "member-access-assignment.js",
+                            "end": [
+                                2,
+                                8
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'y.x' assignment",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "member-access-assignment.js",
+                            "end": [
+                                2,
+                                8
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'y.x' assignment",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "member-access-assignment.js"
+    ],
+    "sha1": "a2a7e40667563b5b73dcafcbb1e476e9bd2454ba",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "fd07c5983ef2c5a8857943d86f1df8f7090a4edd"
+}
+,{
+    "testCaseDescription": "javascript-member-access-assignment-delete-test",
+    "expectedResult": {
+        "changes": {
+            "member-access-assignment.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "member-access-assignment.js",
+                            "end": [
+                                1,
+                                8
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'y.x' assignment",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "member-access-assignment.js"
+    ],
+    "sha1": "fd07c5983ef2c5a8857943d86f1df8f7090a4edd",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "c9211034900804da82ade93b31c9ea5dfdbfcd35"
+}
+,{
+    "testCaseDescription": "javascript-member-access-assignment-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "member-access-assignment.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "member-access-assignment.js",
+                            "end": [
+                                1,
+                                8
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'y.x' assignment",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "member-access-assignment.js"
+    ],
+    "sha1": "c9211034900804da82ade93b31c9ea5dfdbfcd35",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "0286a0f0ca80520eb670a372dbf844ec8357639e"
+}]

test/corpus/diff-summaries/javascript/member-access.json

@@ -0,0 +1,308 @@
+[{
+    "testCaseDescription": "javascript-member-access-insert-test",
+    "expectedResult": {
+        "changes": {
+            "member-access.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "member-access.js",
+                            "end": [
+                                1,
+                                15
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'x.someProperty' member access",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "member-access.js"
+    ],
+    "sha1": "6efc7d3ef6f891602e19a27ed0c598e6c5e179ea",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "4c558b5d02c5e2d435f6a4bbfda3da186aa580b0"
+}
+,{
+    "testCaseDescription": "javascript-member-access-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "member-access.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "member-access.js",
+                            "end": [
+                                1,
+                                20
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'x.someOtherProperty' member access",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "member-access.js",
+                            "end": [
+                                2,
+                                15
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'x.someProperty' member access",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "member-access.js"
+    ],
+    "sha1": "4c558b5d02c5e2d435f6a4bbfda3da186aa580b0",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "ba2f36530d6780fd4b48247d4e07495ab99ff849"
+}
+,{
+    "testCaseDescription": "javascript-member-access-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "member-access.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    3
+                                ],
+                                "name": "member-access.js",
+                                "end": [
+                                    1,
+                                    20
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    3
+                                ],
+                                "name": "member-access.js",
+                                "end": [
+                                    1,
+                                    15
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'someOtherProperty' identifier with the 'someProperty' identifier",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "member-access.js"
+    ],
+    "sha1": "ba2f36530d6780fd4b48247d4e07495ab99ff849",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "236df8848d358b1867fec80674da98c30a21fa4f"
+}
+,{
+    "testCaseDescription": "javascript-member-access-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "member-access.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    3
+                                ],
+                                "name": "member-access.js",
+                                "end": [
+                                    1,
+                                    15
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    3
+                                ],
+                                "name": "member-access.js",
+                                "end": [
+                                    1,
+                                    20
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'someProperty' identifier with the 'someOtherProperty' identifier",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "member-access.js"
+    ],
+    "sha1": "236df8848d358b1867fec80674da98c30a21fa4f",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "7f5877fc43be3f38c976057116b85bd9e54f4c90"
+}
+,{
+    "testCaseDescription": "javascript-member-access-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "member-access.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "member-access.js",
+                            "end": [
+                                1,
+                                20
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'x.someOtherProperty' member access",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "member-access.js",
+                            "end": [
+                                2,
+                                15
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'x.someProperty' member access",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "member-access.js",
+                            "end": [
+                                2,
+                                20
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'x.someOtherProperty' member access",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "member-access.js"
+    ],
+    "sha1": "7f5877fc43be3f38c976057116b85bd9e54f4c90",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "5db12107fe6a175ade7fbff6b24b9d5d32a81ac7"
+}
+,{
+    "testCaseDescription": "javascript-member-access-delete-test",
+    "expectedResult": {
+        "changes": {
+            "member-access.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "member-access.js",
+                            "end": [
+                                1,
+                                15
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'x.someProperty' member access",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "member-access.js"
+    ],
+    "sha1": "5db12107fe6a175ade7fbff6b24b9d5d32a81ac7",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "32fa045d3b6ae515ff252d024963fa53f469ecf2"
+}
+,{
+    "testCaseDescription": "javascript-member-access-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "member-access.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "member-access.js",
+                            "end": [
+                                1,
+                                20
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'x.someOtherProperty' member access",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "member-access.js"
+    ],
+    "sha1": "32fa045d3b6ae515ff252d024963fa53f469ecf2",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "c77d21ce31ff19818614b186e90aa577cc20ce9d"
+}]

test/corpus/diff-summaries/javascript/method-call.json

@@ -0,0 +1,308 @@
+[{
+    "testCaseDescription": "javascript-method-call-insert-test",
+    "expectedResult": {
+        "changes": {
+            "method-call.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "method-call.js",
+                            "end": [
+                                1,
+                                32
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'object.someMethod(arg1, \"arg2\")' method call",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "method-call.js"
+    ],
+    "sha1": "1057513972364b1ca48ee19f74fb73ca06119e8c",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "e331bc52539866046826efc023575d5fd3db6165"
+}
+,{
+    "testCaseDescription": "javascript-method-call-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "method-call.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "method-call.js",
+                            "end": [
+                                1,
+                                32
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'object.someMethod(arg1, \"arg3\")' method call",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "method-call.js",
+                            "end": [
+                                2,
+                                32
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'object.someMethod(arg1, \"arg2\")' method call",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "method-call.js"
+    ],
+    "sha1": "e331bc52539866046826efc023575d5fd3db6165",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "bd24f5dadbf7a65bd231a338e6159df321dd57f5"
+}
+,{
+    "testCaseDescription": "javascript-method-call-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "method-call.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    25
+                                ],
+                                "name": "method-call.js",
+                                "end": [
+                                    1,
+                                    31
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    25
+                                ],
+                                "name": "method-call.js",
+                                "end": [
+                                    1,
+                                    31
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the \"arg3\" string with the \"arg2\" string in the object.someMethod(arg1, \"arg2\") method call",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "method-call.js"
+    ],
+    "sha1": "bd24f5dadbf7a65bd231a338e6159df321dd57f5",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "13271135545e9d65b6ff2a4c7c28616aad1184e6"
+}
+,{
+    "testCaseDescription": "javascript-method-call-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "method-call.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    25
+                                ],
+                                "name": "method-call.js",
+                                "end": [
+                                    1,
+                                    31
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    25
+                                ],
+                                "name": "method-call.js",
+                                "end": [
+                                    1,
+                                    31
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the \"arg2\" string with the \"arg3\" string in the object.someMethod(arg1, \"arg3\") method call",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "method-call.js"
+    ],
+    "sha1": "13271135545e9d65b6ff2a4c7c28616aad1184e6",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "1c29343f384ab78feb8d55b28d06ca5b2c2a1543"
+}
+,{
+    "testCaseDescription": "javascript-method-call-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "method-call.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "method-call.js",
+                            "end": [
+                                1,
+                                32
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'object.someMethod(arg1, \"arg3\")' method call",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "method-call.js",
+                            "end": [
+                                2,
+                                32
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'object.someMethod(arg1, \"arg2\")' method call",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "method-call.js",
+                            "end": [
+                                2,
+                                32
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'object.someMethod(arg1, \"arg3\")' method call",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "method-call.js"
+    ],
+    "sha1": "1c29343f384ab78feb8d55b28d06ca5b2c2a1543",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "f61923d7461a07df3744705230e56b12f0b2d216"
+}
+,{
+    "testCaseDescription": "javascript-method-call-delete-test",
+    "expectedResult": {
+        "changes": {
+            "method-call.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "method-call.js",
+                            "end": [
+                                1,
+                                32
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'object.someMethod(arg1, \"arg2\")' method call",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "method-call.js"
+    ],
+    "sha1": "f61923d7461a07df3744705230e56b12f0b2d216",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "5f7fc9da90b24df9a9ad1ff1eae1b3a00657f16e"
+}
+,{
+    "testCaseDescription": "javascript-method-call-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "method-call.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "method-call.js",
+                            "end": [
+                                1,
+                                32
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'object.someMethod(arg1, \"arg3\")' method call",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "method-call.js"
+    ],
+    "sha1": "5f7fc9da90b24df9a9ad1ff1eae1b3a00657f16e",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "101b21dd5ae54a69443d6899a30f575b0500e085"
+}]

test/corpus/diff-summaries/javascript/named-function.json

@@ -0,0 +1,444 @@
+[{
+    "testCaseDescription": "javascript-named-function-insert-test",
+    "expectedResult": {
+        "changes": {
+            "named-function.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "named-function.js",
+                            "end": [
+                                1,
+                                42
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'myFunction' function",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "named-function.js"
+    ],
+    "sha1": "2f00ecb14d10a4cc210b7a56309fc75db90f3b64",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "e87e0464ade6d9ccfcf8858e8360eed0892ac9d2"
+}
+,{
+    "testCaseDescription": "javascript-named-function-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "named-function.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "named-function.js",
+                            "end": [
+                                1,
+                                45
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'anotherFunction' function",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "named-function.js",
+                            "end": [
+                                2,
+                                42
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'myFunction' function",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "named-function.js"
+    ],
+    "sha1": "e87e0464ade6d9ccfcf8858e8360eed0892ac9d2",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "233d845790d1fb1c6914aa56ee916044c1491955"
+}
+,{
+    "testCaseDescription": "javascript-named-function-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "named-function.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    10
+                                ],
+                                "name": "named-function.js",
+                                "end": [
+                                    1,
+                                    25
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    10
+                                ],
+                                "name": "named-function.js",
+                                "end": [
+                                    1,
+                                    20
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'anotherFunction' identifier with the 'myFunction' identifier in the myFunction function",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                21
+                            ],
+                            "name": "named-function.js",
+                            "end": [
+                                1,
+                                25
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'arg1' identifier in the myFunction function",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                27
+                            ],
+                            "name": "named-function.js",
+                            "end": [
+                                1,
+                                31
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'arg2' identifier in the myFunction function",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                35
+                            ],
+                            "name": "named-function.js",
+                            "end": [
+                                1,
+                                39
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'arg2' identifier in the myFunction function",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                30
+                            ],
+                            "name": "named-function.js",
+                            "end": [
+                                1,
+                                43
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'false' return statement in the myFunction function",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "named-function.js"
+    ],
+    "sha1": "233d845790d1fb1c6914aa56ee916044c1491955",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "6591af1b718467293fb40094d31d8bcd1bc0a679"
+}
+,{
+    "testCaseDescription": "javascript-named-function-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "named-function.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    10
+                                ],
+                                "name": "named-function.js",
+                                "end": [
+                                    1,
+                                    20
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    10
+                                ],
+                                "name": "named-function.js",
+                                "end": [
+                                    1,
+                                    25
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'myFunction' identifier with the 'anotherFunction' identifier in the anotherFunction function",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                21
+                            ],
+                            "name": "named-function.js",
+                            "end": [
+                                1,
+                                25
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'arg1' identifier in the anotherFunction function",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                27
+                            ],
+                            "name": "named-function.js",
+                            "end": [
+                                1,
+                                31
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'arg2' identifier in the anotherFunction function",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                30
+                            ],
+                            "name": "named-function.js",
+                            "end": [
+                                1,
+                                43
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'false' return statement in the anotherFunction function",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                35
+                            ],
+                            "name": "named-function.js",
+                            "end": [
+                                1,
+                                39
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'arg2' identifier in the anotherFunction function",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "named-function.js"
+    ],
+    "sha1": "6591af1b718467293fb40094d31d8bcd1bc0a679",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "ea7b2d944b9f4b906b750883dc50754096ac197d"
+}
+,{
+    "testCaseDescription": "javascript-named-function-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "named-function.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "named-function.js",
+                            "end": [
+                                1,
+                                45
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'anotherFunction' function",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "named-function.js",
+                            "end": [
+                                2,
+                                42
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'myFunction' function",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "named-function.js",
+                            "end": [
+                                2,
+                                45
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'anotherFunction' function",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "named-function.js"
+    ],
+    "sha1": "ea7b2d944b9f4b906b750883dc50754096ac197d",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "d5d86035b6457b7e1f55cbe249d2f36cca54ca86"
+}
+,{
+    "testCaseDescription": "javascript-named-function-delete-test",
+    "expectedResult": {
+        "changes": {
+            "named-function.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "named-function.js",
+                            "end": [
+                                1,
+                                42
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'myFunction' function",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "named-function.js"
+    ],
+    "sha1": "d5d86035b6457b7e1f55cbe249d2f36cca54ca86",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "ac73db0211c8b73c9ce79a3c730606fdfca84dbe"
+}
+,{
+    "testCaseDescription": "javascript-named-function-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "named-function.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "named-function.js",
+                            "end": [
+                                1,
+                                45
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'anotherFunction' function",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "named-function.js"
+    ],
+    "sha1": "ac73db0211c8b73c9ce79a3c730606fdfca84dbe",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "6efc7d3ef6f891602e19a27ed0c598e6c5e179ea"
+}]

test/corpus/diff-summaries/javascript/nested-do-while-in-function.json

@@ -0,0 +1,368 @@
+[{
+    "testCaseDescription": "javascript-nested-do-while-in-function-insert-test",
+    "expectedResult": {
+        "changes": {
+            "nested-do-while-in-function.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "nested-do-while-in-function.js",
+                            "end": [
+                                1,
+                                65
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'f' function",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "nested-do-while-in-function.js"
+    ],
+    "sha1": "70ec1b887cd3227d1db143720c9f83c6aee76857",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "40718757d69121812c5a1b88b6b254d91fff927d"
+}
+,{
+    "testCaseDescription": "javascript-nested-do-while-in-function-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "nested-do-while-in-function.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "nested-do-while-in-function.js",
+                            "end": [
+                                1,
+                                65
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'f' function",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "nested-do-while-in-function.js",
+                            "end": [
+                                2,
+                                65
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'f' function",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "nested-do-while-in-function.js"
+    ],
+    "sha1": "40718757d69121812c5a1b88b6b254d91fff927d",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "f62ea5ca3fd0fa46620b5e5794eb8e70b1699e51"
+}
+,{
+    "testCaseDescription": "javascript-nested-do-while-in-function-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "nested-do-while-in-function.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    41
+                                ],
+                                "name": "nested-do-while-in-function.js",
+                                "end": [
+                                    1,
+                                    45
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    41
+                                ],
+                                "name": "nested-do-while-in-function.js",
+                                "end": [
+                                    1,
+                                    45
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'arg2' identifier with the 'arg1' identifier in the something(arg1) function call of the 'f' function",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    57
+                                ],
+                                "name": "nested-do-while-in-function.js",
+                                "end": [
+                                    1,
+                                    61
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    57
+                                ],
+                                "name": "nested-do-while-in-function.js",
+                                "end": [
+                                    1,
+                                    61
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'arg1' identifier with the 'arg2' identifier in the arg2 do/while statement of the 'f' function",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "nested-do-while-in-function.js"
+    ],
+    "sha1": "f62ea5ca3fd0fa46620b5e5794eb8e70b1699e51",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "c89b566e205a722065b4898e103cb48518469ae4"
+}
+,{
+    "testCaseDescription": "javascript-nested-do-while-in-function-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "nested-do-while-in-function.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    41
+                                ],
+                                "name": "nested-do-while-in-function.js",
+                                "end": [
+                                    1,
+                                    45
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    41
+                                ],
+                                "name": "nested-do-while-in-function.js",
+                                "end": [
+                                    1,
+                                    45
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'arg1' identifier with the 'arg2' identifier in the something(arg2) function call of the 'f' function",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    57
+                                ],
+                                "name": "nested-do-while-in-function.js",
+                                "end": [
+                                    1,
+                                    61
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    57
+                                ],
+                                "name": "nested-do-while-in-function.js",
+                                "end": [
+                                    1,
+                                    61
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'arg2' identifier with the 'arg1' identifier in the arg1 do/while statement of the 'f' function",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "nested-do-while-in-function.js"
+    ],
+    "sha1": "c89b566e205a722065b4898e103cb48518469ae4",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "f56c46085db0b8db31cfa4540af347117d489e8b"
+}
+,{
+    "testCaseDescription": "javascript-nested-do-while-in-function-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "nested-do-while-in-function.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "nested-do-while-in-function.js",
+                            "end": [
+                                1,
+                                65
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'f' function",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "nested-do-while-in-function.js",
+                            "end": [
+                                2,
+                                65
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'f' function",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "nested-do-while-in-function.js",
+                            "end": [
+                                2,
+                                65
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'f' function",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "nested-do-while-in-function.js"
+    ],
+    "sha1": "f56c46085db0b8db31cfa4540af347117d489e8b",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "c3a81eba697a0b359b9a762fed814b36cafd9f0f"
+}
+,{
+    "testCaseDescription": "javascript-nested-do-while-in-function-delete-test",
+    "expectedResult": {
+        "changes": {
+            "nested-do-while-in-function.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "nested-do-while-in-function.js",
+                            "end": [
+                                1,
+                                65
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'f' function",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "nested-do-while-in-function.js"
+    ],
+    "sha1": "c3a81eba697a0b359b9a762fed814b36cafd9f0f",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "4278eca970eb128b7ea79e9b227763b4726f3acd"
+}
+,{
+    "testCaseDescription": "javascript-nested-do-while-in-function-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "nested-do-while-in-function.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "nested-do-while-in-function.js",
+                            "end": [
+                                1,
+                                65
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'f' function",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "nested-do-while-in-function.js"
+    ],
+    "sha1": "4278eca970eb128b7ea79e9b227763b4726f3acd",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "14310ea870b177f2187e152498699c8cd1b039f3"
+}]

test/corpus/diff-summaries/javascript/nested-functions.json

@@ -0,0 +1,368 @@
+[{
+    "testCaseDescription": "javascript-nested-functions-insert-test",
+    "expectedResult": {
+        "changes": {
+            "nested-functions.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "nested-functions.js",
+                            "end": [
+                                1,
+                                103
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'parent' function",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "nested-functions.js"
+    ],
+    "sha1": "2747446a2e77138d8a05f4ac9068b6c2fefe8c3d",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "dc05fc47073a90674b27dd52f2e20157d4bbb692"
+}
+,{
+    "testCaseDescription": "javascript-nested-functions-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "nested-functions.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "nested-functions.js",
+                            "end": [
+                                1,
+                                103
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'parent' function",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "nested-functions.js",
+                            "end": [
+                                2,
+                                103
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'parent' function",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "nested-functions.js"
+    ],
+    "sha1": "dc05fc47073a90674b27dd52f2e20157d4bbb692",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "ceda9837fa4d5f417bc943f0df77c878b51e4620"
+}
+,{
+    "testCaseDescription": "javascript-nested-functions-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "nested-functions.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    74
+                                ],
+                                "name": "nested-functions.js",
+                                "end": [
+                                    1,
+                                    78
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    74
+                                ],
+                                "name": "nested-functions.js",
+                                "end": [
+                                    1,
+                                    78
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'arg1' identifier with the 'arg3' identifier in the console.log(arg3) method call of the 'child' function",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    93
+                                ],
+                                "name": "nested-functions.js",
+                                "end": [
+                                    1,
+                                    97
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    93
+                                ],
+                                "name": "nested-functions.js",
+                                "end": [
+                                    1,
+                                    97
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'arg2' identifier with the 'arg4' identifier in the console.log(arg4) method call of the 'child' function",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "nested-functions.js"
+    ],
+    "sha1": "ceda9837fa4d5f417bc943f0df77c878b51e4620",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "31c2d106f210aa5efc7ffc2d638d12ad48229812"
+}
+,{
+    "testCaseDescription": "javascript-nested-functions-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "nested-functions.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    74
+                                ],
+                                "name": "nested-functions.js",
+                                "end": [
+                                    1,
+                                    78
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    74
+                                ],
+                                "name": "nested-functions.js",
+                                "end": [
+                                    1,
+                                    78
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'arg3' identifier with the 'arg1' identifier in the console.log(arg1) method call of the 'child' function",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    93
+                                ],
+                                "name": "nested-functions.js",
+                                "end": [
+                                    1,
+                                    97
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    93
+                                ],
+                                "name": "nested-functions.js",
+                                "end": [
+                                    1,
+                                    97
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'arg4' identifier with the 'arg2' identifier in the console.log(arg2) method call of the 'child' function",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "nested-functions.js"
+    ],
+    "sha1": "31c2d106f210aa5efc7ffc2d638d12ad48229812",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "98eb2195462290eb69d5a2a744c9d1979899bbe8"
+}
+,{
+    "testCaseDescription": "javascript-nested-functions-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "nested-functions.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "nested-functions.js",
+                            "end": [
+                                1,
+                                103
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'parent' function",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "nested-functions.js",
+                            "end": [
+                                2,
+                                103
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'parent' function",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "nested-functions.js",
+                            "end": [
+                                2,
+                                103
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'parent' function",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "nested-functions.js"
+    ],
+    "sha1": "98eb2195462290eb69d5a2a744c9d1979899bbe8",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "f6573d0d559b96309ebf0d5079e43976d0bc7fe8"
+}
+,{
+    "testCaseDescription": "javascript-nested-functions-delete-test",
+    "expectedResult": {
+        "changes": {
+            "nested-functions.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "nested-functions.js",
+                            "end": [
+                                1,
+                                103
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'parent' function",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "nested-functions.js"
+    ],
+    "sha1": "f6573d0d559b96309ebf0d5079e43976d0bc7fe8",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "23cf31d25f6690285855642d7471b14c8c0679b0"
+}
+,{
+    "testCaseDescription": "javascript-nested-functions-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "nested-functions.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "nested-functions.js",
+                            "end": [
+                                1,
+                                103
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'parent' function",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "nested-functions.js"
+    ],
+    "sha1": "23cf31d25f6690285855642d7471b14c8c0679b0",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "70ec1b887cd3227d1db143720c9f83c6aee76857"
+}]

test/corpus/diff-summaries/javascript/null.json

@@ -0,0 +1,316 @@
+[{
+    "testCaseDescription": "javascript-null-insert-test",
+    "expectedResult": {
+        "changes": {
+            "null.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "null.js",
+                            "end": [
+                                1,
+                                5
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'null' identifier",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "null.js"
+    ],
+    "sha1": "11a27a81f8e7e33aac2eb0844d3465acf8f9bb0d",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "eb6644a70a4cd3a9d3cc65812e3ac5c1a4d76520"
+}
+,{
+    "testCaseDescription": "javascript-null-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "null.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "null.js",
+                            "end": [
+                                1,
+                                13
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'null' return statement",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "null.js",
+                            "end": [
+                                2,
+                                5
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'null' identifier",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "null.js"
+    ],
+    "sha1": "eb6644a70a4cd3a9d3cc65812e3ac5c1a4d76520",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "94a5c1d61909967783e1c9acca96fdf47cde7f3e"
+}
+,{
+    "testCaseDescription": "javascript-null-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "null.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "null.js",
+                            "end": [
+                                1,
+                                5
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'null' identifier",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "null.js",
+                            "end": [
+                                1,
+                                13
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'null' return statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "null.js"
+    ],
+    "sha1": "94a5c1d61909967783e1c9acca96fdf47cde7f3e",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "5dcff49942934eff57dac635ed367b34a9579c9c"
+}
+,{
+    "testCaseDescription": "javascript-null-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "null.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "null.js",
+                            "end": [
+                                1,
+                                13
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'null' return statement",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "null.js",
+                            "end": [
+                                1,
+                                5
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'null' identifier",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "null.js"
+    ],
+    "sha1": "5dcff49942934eff57dac635ed367b34a9579c9c",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "606f0007b3d2e0c89cce1fbc92d0fbbeaff87c11"
+}
+,{
+    "testCaseDescription": "javascript-null-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "null.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "null.js",
+                            "end": [
+                                1,
+                                13
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'null' return statement",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "null.js",
+                            "end": [
+                                2,
+                                5
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'null' identifier",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "null.js",
+                            "end": [
+                                2,
+                                13
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'null' return statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "null.js"
+    ],
+    "sha1": "606f0007b3d2e0c89cce1fbc92d0fbbeaff87c11",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "1142c2c15d6730bb2bfa0be5f76115ca4667064c"
+}
+,{
+    "testCaseDescription": "javascript-null-delete-test",
+    "expectedResult": {
+        "changes": {
+            "null.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "null.js",
+                            "end": [
+                                1,
+                                5
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'null' identifier",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "null.js"
+    ],
+    "sha1": "1142c2c15d6730bb2bfa0be5f76115ca4667064c",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "74f6868171e2ab7e8a4e77d6b07d1e7c1dcb6b07"
+}
+,{
+    "testCaseDescription": "javascript-null-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "null.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "null.js",
+                            "end": [
+                                1,
+                                13
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'null' return statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "null.js"
+    ],
+    "sha1": "74f6868171e2ab7e8a4e77d6b07d1e7c1dcb6b07",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "43fd131de0f55fa1826e3fa3b95b88b7ba74fd68"
+}]

test/corpus/diff-summaries/javascript/number.json

@@ -0,0 +1,308 @@
+[{
+    "testCaseDescription": "javascript-number-insert-test",
+    "expectedResult": {
+        "changes": {
+            "number.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "number.js",
+                            "end": [
+                                1,
+                                4
+                            ]
+                        }
+                    },
+                    "summary": "Added '101'",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "number.js"
+    ],
+    "sha1": "6353fa1218bad4624b606cf46bfcd6c18d1e13c2",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "7c7876c3c6be4f9f70b5b83ea763df7301fcd684"
+}
+,{
+    "testCaseDescription": "javascript-number-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "number.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "number.js",
+                            "end": [
+                                1,
+                                4
+                            ]
+                        }
+                    },
+                    "summary": "Added '102'",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "number.js",
+                            "end": [
+                                2,
+                                4
+                            ]
+                        }
+                    },
+                    "summary": "Added '101'",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "number.js"
+    ],
+    "sha1": "7c7876c3c6be4f9f70b5b83ea763df7301fcd684",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "504616415391cd15d571dad61cf0df37572cc9a9"
+}
+,{
+    "testCaseDescription": "javascript-number-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "number.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    1
+                                ],
+                                "name": "number.js",
+                                "end": [
+                                    1,
+                                    4
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    1
+                                ],
+                                "name": "number.js",
+                                "end": [
+                                    1,
+                                    4
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced '102' with '101'",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "number.js"
+    ],
+    "sha1": "504616415391cd15d571dad61cf0df37572cc9a9",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "63450eae5510a793bdf738ccd7956bce348ce393"
+}
+,{
+    "testCaseDescription": "javascript-number-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "number.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    1
+                                ],
+                                "name": "number.js",
+                                "end": [
+                                    1,
+                                    4
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    1
+                                ],
+                                "name": "number.js",
+                                "end": [
+                                    1,
+                                    4
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced '101' with '102'",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "number.js"
+    ],
+    "sha1": "63450eae5510a793bdf738ccd7956bce348ce393",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "db793bae2da69d2c4d00dd90611a9cd5913a5efc"
+}
+,{
+    "testCaseDescription": "javascript-number-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "number.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "number.js",
+                            "end": [
+                                1,
+                                4
+                            ]
+                        }
+                    },
+                    "summary": "Deleted '102'",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "number.js",
+                            "end": [
+                                2,
+                                4
+                            ]
+                        }
+                    },
+                    "summary": "Deleted '101'",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "number.js",
+                            "end": [
+                                2,
+                                4
+                            ]
+                        }
+                    },
+                    "summary": "Added '102'",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "number.js"
+    ],
+    "sha1": "db793bae2da69d2c4d00dd90611a9cd5913a5efc",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "0c5dcd56a648d9cf91377e14604afa2f64ca6738"
+}
+,{
+    "testCaseDescription": "javascript-number-delete-test",
+    "expectedResult": {
+        "changes": {
+            "number.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "number.js",
+                            "end": [
+                                1,
+                                4
+                            ]
+                        }
+                    },
+                    "summary": "Deleted '101'",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "number.js"
+    ],
+    "sha1": "0c5dcd56a648d9cf91377e14604afa2f64ca6738",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "ccdba59644ee3190b25f1975f8ef24c0d0a39a1c"
+}
+,{
+    "testCaseDescription": "javascript-number-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "number.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "number.js",
+                            "end": [
+                                1,
+                                4
+                            ]
+                        }
+                    },
+                    "summary": "Deleted '102'",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "number.js"
+    ],
+    "sha1": "ccdba59644ee3190b25f1975f8ef24c0d0a39a1c",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "7cd0762fb1e84cad3dcf9a1c41b07c8112c888fd"
+}]

test/corpus/diff-summaries/javascript/object-with-methods.json

@@ -0,0 +1,308 @@
+[{
+    "testCaseDescription": "javascript-objects-with-methods-insert-test",
+    "expectedResult": {
+        "changes": {
+            "objects-with-methods.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "objects-with-methods.js",
+                            "end": [
+                                1,
+                                32
+                            ]
+                        }
+                    },
+                    "summary": "Added the '{ add }' object",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "objects-with-methods.js"
+    ],
+    "sha1": "59872fcdcee9cd22104933bbc925d9987cd393b6",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "b3aa3244e4a63ad27cee5f101e357a16bbb6e3b5"
+}
+,{
+    "testCaseDescription": "javascript-objects-with-methods-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "objects-with-methods.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "objects-with-methods.js",
+                            "end": [
+                                1,
+                                37
+                            ]
+                        }
+                    },
+                    "summary": "Added the '{ subtract }' object",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "objects-with-methods.js",
+                            "end": [
+                                2,
+                                32
+                            ]
+                        }
+                    },
+                    "summary": "Added the '{ add }' object",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "objects-with-methods.js"
+    ],
+    "sha1": "b3aa3244e4a63ad27cee5f101e357a16bbb6e3b5",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "8dbd1ca6c20e067e9a66b00e6e9eb883d0ee3635"
+}
+,{
+    "testCaseDescription": "javascript-objects-with-methods-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "objects-with-methods.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    3
+                                ],
+                                "name": "objects-with-methods.js",
+                                "end": [
+                                    1,
+                                    11
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    3
+                                ],
+                                "name": "objects-with-methods.js",
+                                "end": [
+                                    1,
+                                    6
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'subtract' identifier with the 'add' identifier in the add method",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "objects-with-methods.js"
+    ],
+    "sha1": "8dbd1ca6c20e067e9a66b00e6e9eb883d0ee3635",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "e14f2325776fdfc3c455b97c477dda641cf9fa04"
+}
+,{
+    "testCaseDescription": "javascript-objects-with-methods-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "objects-with-methods.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    3
+                                ],
+                                "name": "objects-with-methods.js",
+                                "end": [
+                                    1,
+                                    6
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    3
+                                ],
+                                "name": "objects-with-methods.js",
+                                "end": [
+                                    1,
+                                    11
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'add' identifier with the 'subtract' identifier in the subtract method",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "objects-with-methods.js"
+    ],
+    "sha1": "e14f2325776fdfc3c455b97c477dda641cf9fa04",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "7b8889fcf97d4f9b27d986f7dbedea7ab1b737d0"
+}
+,{
+    "testCaseDescription": "javascript-objects-with-methods-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "objects-with-methods.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "objects-with-methods.js",
+                            "end": [
+                                1,
+                                37
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the '{ subtract }' object",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "objects-with-methods.js",
+                            "end": [
+                                2,
+                                32
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the '{ add }' object",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "objects-with-methods.js",
+                            "end": [
+                                2,
+                                37
+                            ]
+                        }
+                    },
+                    "summary": "Added the '{ subtract }' object",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "objects-with-methods.js"
+    ],
+    "sha1": "7b8889fcf97d4f9b27d986f7dbedea7ab1b737d0",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "d731aac66d17f598fc601b02c4ad03adff3a3bae"
+}
+,{
+    "testCaseDescription": "javascript-objects-with-methods-delete-test",
+    "expectedResult": {
+        "changes": {
+            "objects-with-methods.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "objects-with-methods.js",
+                            "end": [
+                                1,
+                                32
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the '{ add }' object",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "objects-with-methods.js"
+    ],
+    "sha1": "d731aac66d17f598fc601b02c4ad03adff3a3bae",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "f2ac6622cd2122b9163f11890d688ac53a9bd01e"
+}
+,{
+    "testCaseDescription": "javascript-objects-with-methods-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "objects-with-methods.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "objects-with-methods.js",
+                            "end": [
+                                1,
+                                37
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the '{ subtract }' object",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "objects-with-methods.js"
+    ],
+    "sha1": "f2ac6622cd2122b9163f11890d688ac53a9bd01e",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "71a215c337687c245da7c6eafcba311e3ba0e09b"
+}]

test/corpus/diff-summaries/javascript/object.json

@@ -0,0 +1,316 @@
+[{
+    "testCaseDescription": "javascript-object-insert-test",
+    "expectedResult": {
+        "changes": {
+            "object.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "object.js",
+                            "end": [
+                                1,
+                                21
+                            ]
+                        }
+                    },
+                    "summary": "Added the '{ \"key1\": … }' object",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "object.js"
+    ],
+    "sha1": "851fcf30f6f5512f49a59cc7167c684cdf668576",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "8e2ca717edb3e850c87a7a5d0f4299018e008adb"
+}
+,{
+    "testCaseDescription": "javascript-object-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "object.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "object.js",
+                            "end": [
+                                1,
+                                54
+                            ]
+                        }
+                    },
+                    "summary": "Added the '{ \"key1\": …, \"key2\": …, \"key3\": … }' object",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "object.js",
+                            "end": [
+                                2,
+                                21
+                            ]
+                        }
+                    },
+                    "summary": "Added the '{ \"key1\": … }' object",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "object.js"
+    ],
+    "sha1": "8e2ca717edb3e850c87a7a5d0f4299018e008adb",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "9984c70968070ad662bff6c3b00840bfaf8c1230"
+}
+,{
+    "testCaseDescription": "javascript-object-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "object.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                21
+                            ],
+                            "name": "object.js",
+                            "end": [
+                                1,
+                                37
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the '\"key2\": …' pair",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                39
+                            ],
+                            "name": "object.js",
+                            "end": [
+                                1,
+                                52
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the '\"key3\": …' pair",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "object.js"
+    ],
+    "sha1": "9984c70968070ad662bff6c3b00840bfaf8c1230",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "34a57cf66174002c4cb01bc2cde145af45c79bd1"
+}
+,{
+    "testCaseDescription": "javascript-object-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "object.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                21
+                            ],
+                            "name": "object.js",
+                            "end": [
+                                1,
+                                37
+                            ]
+                        }
+                    },
+                    "summary": "Added the '\"key2\": …' pair",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                39
+                            ],
+                            "name": "object.js",
+                            "end": [
+                                1,
+                                52
+                            ]
+                        }
+                    },
+                    "summary": "Added the '\"key3\": …' pair",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "object.js"
+    ],
+    "sha1": "34a57cf66174002c4cb01bc2cde145af45c79bd1",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "5212b2d89e443b54f3fa34e7f52123fe152bed71"
+}
+,{
+    "testCaseDescription": "javascript-object-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "object.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "object.js",
+                            "end": [
+                                1,
+                                54
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the '{ \"key1\": …, \"key2\": …, \"key3\": … }' object",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "object.js",
+                            "end": [
+                                2,
+                                21
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the '{ \"key1\": … }' object",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "object.js",
+                            "end": [
+                                2,
+                                54
+                            ]
+                        }
+                    },
+                    "summary": "Added the '{ \"key1\": …, \"key2\": …, \"key3\": … }' object",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "object.js"
+    ],
+    "sha1": "5212b2d89e443b54f3fa34e7f52123fe152bed71",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "aa3e5600050b3762cdf02c85bdd7c6c91c52896e"
+}
+,{
+    "testCaseDescription": "javascript-object-delete-test",
+    "expectedResult": {
+        "changes": {
+            "object.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "object.js",
+                            "end": [
+                                1,
+                                21
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the '{ \"key1\": … }' object",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "object.js"
+    ],
+    "sha1": "aa3e5600050b3762cdf02c85bdd7c6c91c52896e",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "ffbe546c27f8f46e1c56d5d60f298870b4afe943"
+}
+,{
+    "testCaseDescription": "javascript-object-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "object.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "object.js",
+                            "end": [
+                                1,
+                                54
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the '{ \"key1\": …, \"key2\": …, \"key3\": … }' object",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "object.js"
+    ],
+    "sha1": "ffbe546c27f8f46e1c56d5d60f298870b4afe943",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "4e616c4976a8cc24c20fda3c6bfcde4cfa22483f"
+}]

test/corpus/diff-summaries/javascript/regex.json

@@ -0,0 +1,308 @@
+[{
+    "testCaseDescription": "javascript-regex-insert-test",
+    "expectedResult": {
+        "changes": {
+            "regex.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "regex.js",
+                            "end": [
+                                1,
+                                7
+                            ]
+                        }
+                    },
+                    "summary": "Added the '/one/g' regex",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "regex.js"
+    ],
+    "sha1": "87a75eabc61b58f15583babf507419181ab63aeb",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "650dad8817cc6e81699795ce01d6f55f47ee8467"
+}
+,{
+    "testCaseDescription": "javascript-regex-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "regex.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "regex.js",
+                            "end": [
+                                1,
+                                15
+                            ]
+                        }
+                    },
+                    "summary": "Added the '/on[^/]afe/gim' regex",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "regex.js",
+                            "end": [
+                                2,
+                                7
+                            ]
+                        }
+                    },
+                    "summary": "Added the '/one/g' regex",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "regex.js"
+    ],
+    "sha1": "650dad8817cc6e81699795ce01d6f55f47ee8467",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "6ccce2bf1a0492d851f6a12566b7eecabbc53e7c"
+}
+,{
+    "testCaseDescription": "javascript-regex-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "regex.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    1
+                                ],
+                                "name": "regex.js",
+                                "end": [
+                                    1,
+                                    15
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    1
+                                ],
+                                "name": "regex.js",
+                                "end": [
+                                    1,
+                                    7
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the '/on[^/]afe/gim' regex with the '/one/g' regex",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "regex.js"
+    ],
+    "sha1": "6ccce2bf1a0492d851f6a12566b7eecabbc53e7c",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "20edafc45d28234ef35c2f4ac6c5f3b72a9e178a"
+}
+,{
+    "testCaseDescription": "javascript-regex-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "regex.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    1
+                                ],
+                                "name": "regex.js",
+                                "end": [
+                                    1,
+                                    7
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    1
+                                ],
+                                "name": "regex.js",
+                                "end": [
+                                    1,
+                                    15
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the '/one/g' regex with the '/on[^/]afe/gim' regex",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "regex.js"
+    ],
+    "sha1": "20edafc45d28234ef35c2f4ac6c5f3b72a9e178a",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "3f6396c441334c8beaa3819e7b6cdb44196341c3"
+}
+,{
+    "testCaseDescription": "javascript-regex-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "regex.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "regex.js",
+                            "end": [
+                                1,
+                                15
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the '/on[^/]afe/gim' regex",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "regex.js",
+                            "end": [
+                                2,
+                                7
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the '/one/g' regex",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "regex.js",
+                            "end": [
+                                2,
+                                15
+                            ]
+                        }
+                    },
+                    "summary": "Added the '/on[^/]afe/gim' regex",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "regex.js"
+    ],
+    "sha1": "3f6396c441334c8beaa3819e7b6cdb44196341c3",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "a09af80adb555a0c9c30839fbe7014942bfcf449"
+}
+,{
+    "testCaseDescription": "javascript-regex-delete-test",
+    "expectedResult": {
+        "changes": {
+            "regex.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "regex.js",
+                            "end": [
+                                1,
+                                7
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the '/one/g' regex",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "regex.js"
+    ],
+    "sha1": "a09af80adb555a0c9c30839fbe7014942bfcf449",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "e0e94d4e600134f55d47ad0fbdea6f791be2e618"
+}
+,{
+    "testCaseDescription": "javascript-regex-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "regex.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "regex.js",
+                            "end": [
+                                1,
+                                15
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the '/on[^/]afe/gim' regex",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "regex.js"
+    ],
+    "sha1": "e0e94d4e600134f55d47ad0fbdea6f791be2e618",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "408411b4e79d51cf3b50541c8d1115a3ce46dfa8"
+}]

test/corpus/diff-summaries/javascript/relational-operator.json

@@ -0,0 +1,208 @@
+[{
+    "testCaseDescription": "javascript-relational-operator-insert-test",
+    "expectedResult": {
+        "changes": {
+            "relational-operator.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "relational-operator.js",
+                            "end": [
+                                1,
+                                6
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'x < y' relational operator",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "relational-operator.js"
+    ],
+    "sha1": "8cdb0cc77bfe88b76c86dcde66d08f97f11182f3",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "da2638f6fc96de8b58f104e1db1d5a665b5e3a9b"
+}
+,{
+    "testCaseDescription": "javascript-relational-operator-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "relational-operator.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "relational-operator.js",
+                            "end": [
+                                1,
+                                7
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'x <= y' relational operator",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "relational-operator.js",
+                            "end": [
+                                2,
+                                6
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'x < y' relational operator",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "relational-operator.js"
+    ],
+    "sha1": "da2638f6fc96de8b58f104e1db1d5a665b5e3a9b",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "95ef181dcd3fc26ed54bf60bfd60447a51c8ffd7"
+}
+,{
+    "testCaseDescription": "javascript-relational-operator-delete-insert-test",
+    "expectedResult": {
+        "changes": {},
+        "errors": {}
+    },
+    "filePaths": [
+        "relational-operator.js"
+    ],
+    "sha1": "95ef181dcd3fc26ed54bf60bfd60447a51c8ffd7",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "d3346f7942edffe06e10ca06433091c89a815a74"
+}
+,{
+    "testCaseDescription": "javascript-relational-operator-replacement-test",
+    "expectedResult": {
+        "changes": {},
+        "errors": {}
+    },
+    "filePaths": [
+        "relational-operator.js"
+    ],
+    "sha1": "d3346f7942edffe06e10ca06433091c89a815a74",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "8b110a7eeb3d75ad831ec61d91539bb3110a5c82"
+}
+,{
+    "testCaseDescription": "javascript-relational-operator-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "relational-operator.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "relational-operator.js",
+                            "end": [
+                                1,
+                                7
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'x <= y' relational operator",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "relational-operator.js"
+    ],
+    "sha1": "8b110a7eeb3d75ad831ec61d91539bb3110a5c82",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "02d3364197afdd61f67f2e693ae3a8d09c64560f"
+}
+,{
+    "testCaseDescription": "javascript-relational-operator-delete-test",
+    "expectedResult": {
+        "changes": {
+            "relational-operator.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "relational-operator.js",
+                            "end": [
+                                1,
+                                6
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'x < y' relational operator",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "relational-operator.js"
+    ],
+    "sha1": "02d3364197afdd61f67f2e693ae3a8d09c64560f",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "59255aa8bf840f1bf5dc446a5c4190a538be2f13"
+}
+,{
+    "testCaseDescription": "javascript-relational-operator-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "relational-operator.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "relational-operator.js",
+                            "end": [
+                                1,
+                                7
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'x <= y' relational operator",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "relational-operator.js"
+    ],
+    "sha1": "59255aa8bf840f1bf5dc446a5c4190a538be2f13",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "761990749004312c4b5e474eeacb839376523f0b"
+}]

test/corpus/diff-summaries/javascript/return-statement.json

@@ -0,0 +1,282 @@
+[{
+    "testCaseDescription": "javascript-return-statement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "return-statement.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "return-statement.js",
+                            "end": [
+                                1,
+                                10
+                            ]
+                        }
+                    },
+                    "summary": "Added the '5' return statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "return-statement.js"
+    ],
+    "sha1": "a6c49cc7711970d9b1fdcfeef8ea1b312bcf0ace",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "cce29acfef026dd830249e9d1336513f6e3c4304"
+}
+,{
+    "testCaseDescription": "javascript-return-statement-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "return-statement.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "return-statement.js",
+                            "end": [
+                                1,
+                                8
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'empty' return statement",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "return-statement.js",
+                            "end": [
+                                2,
+                                10
+                            ]
+                        }
+                    },
+                    "summary": "Added the '5' return statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "return-statement.js"
+    ],
+    "sha1": "cce29acfef026dd830249e9d1336513f6e3c4304",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "c8de458d3d17e648dfbf1869bb0b1ce2e0979601"
+}
+,{
+    "testCaseDescription": "javascript-return-statement-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "return-statement.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                8
+                            ],
+                            "name": "return-statement.js",
+                            "end": [
+                                1,
+                                9
+                            ]
+                        }
+                    },
+                    "summary": "Added '5'",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "return-statement.js"
+    ],
+    "sha1": "c8de458d3d17e648dfbf1869bb0b1ce2e0979601",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "1ec1da945159b2908ed73826fa61ed65680b7ab0"
+}
+,{
+    "testCaseDescription": "javascript-return-statement-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "return-statement.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                8
+                            ],
+                            "name": "return-statement.js",
+                            "end": [
+                                1,
+                                9
+                            ]
+                        }
+                    },
+                    "summary": "Deleted '5'",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "return-statement.js"
+    ],
+    "sha1": "1ec1da945159b2908ed73826fa61ed65680b7ab0",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "d942adb626ca42c2407c698701c173fcf1215775"
+}
+,{
+    "testCaseDescription": "javascript-return-statement-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "return-statement.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "return-statement.js",
+                            "end": [
+                                1,
+                                8
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'empty' return statement",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "return-statement.js",
+                            "end": [
+                                2,
+                                10
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the '5' return statement",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "return-statement.js",
+                            "end": [
+                                2,
+                                8
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'empty' return statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "return-statement.js"
+    ],
+    "sha1": "d942adb626ca42c2407c698701c173fcf1215775",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "d4af520a89d43ed45e2ab60753d6b5e0542c2812"
+}
+,{
+    "testCaseDescription": "javascript-return-statement-delete-test",
+    "expectedResult": {
+        "changes": {
+            "return-statement.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "return-statement.js",
+                            "end": [
+                                1,
+                                10
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the '5' return statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "return-statement.js"
+    ],
+    "sha1": "d4af520a89d43ed45e2ab60753d6b5e0542c2812",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "006d0dd9f64dfec01d6a4027448f81864951fc14"
+}
+,{
+    "testCaseDescription": "javascript-return-statement-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "return-statement.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "return-statement.js",
+                            "end": [
+                                1,
+                                8
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'empty' return statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "return-statement.js"
+    ],
+    "sha1": "006d0dd9f64dfec01d6a4027448f81864951fc14",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "a5fb0a1bf511cc98cae35a20ea3a6dad064448bc"
+}]

test/corpus/diff-summaries/javascript/string.json

@@ -0,0 +1,308 @@
+[{
+    "testCaseDescription": "javascript-string-insert-test",
+    "expectedResult": {
+        "changes": {
+            "string.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "string.js",
+                            "end": [
+                                1,
+                                32
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'A string with \"double\" quotes' string",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "string.js"
+    ],
+    "sha1": "71a215c337687c245da7c6eafcba311e3ba0e09b",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "890f6940b147be1142451548897bb522f2cc0e0e"
+}
+,{
+    "testCaseDescription": "javascript-string-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "string.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "string.js",
+                            "end": [
+                                1,
+                                42
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'A different string with \"double\" quotes' string",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "string.js",
+                            "end": [
+                                2,
+                                32
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'A string with \"double\" quotes' string",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "string.js"
+    ],
+    "sha1": "890f6940b147be1142451548897bb522f2cc0e0e",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "a1bd8ab3294f256b512c1c8f2e71e36f5382c5dc"
+}
+,{
+    "testCaseDescription": "javascript-string-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "string.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    1
+                                ],
+                                "name": "string.js",
+                                "end": [
+                                    1,
+                                    42
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    1
+                                ],
+                                "name": "string.js",
+                                "end": [
+                                    1,
+                                    32
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'A different string with \"double\" quotes' string with the 'A string with \"double\" quotes' string",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "string.js"
+    ],
+    "sha1": "a1bd8ab3294f256b512c1c8f2e71e36f5382c5dc",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "6965b973b84c4170ec98730272475e697686d29e"
+}
+,{
+    "testCaseDescription": "javascript-string-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "string.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    1
+                                ],
+                                "name": "string.js",
+                                "end": [
+                                    1,
+                                    32
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    1
+                                ],
+                                "name": "string.js",
+                                "end": [
+                                    1,
+                                    42
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'A string with \"double\" quotes' string with the 'A different string with \"double\" quotes' string",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "string.js"
+    ],
+    "sha1": "6965b973b84c4170ec98730272475e697686d29e",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "92a860f5c70f4aa4da65a6919a026b01d717804c"
+}
+,{
+    "testCaseDescription": "javascript-string-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "string.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "string.js",
+                            "end": [
+                                1,
+                                42
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'A different string with \"double\" quotes' string",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "string.js",
+                            "end": [
+                                2,
+                                32
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'A string with \"double\" quotes' string",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "string.js",
+                            "end": [
+                                2,
+                                42
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'A different string with \"double\" quotes' string",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "string.js"
+    ],
+    "sha1": "92a860f5c70f4aa4da65a6919a026b01d717804c",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "27d40a59d34bcf26ccd02b06f857c20f85a9df41"
+}
+,{
+    "testCaseDescription": "javascript-string-delete-test",
+    "expectedResult": {
+        "changes": {
+            "string.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "string.js",
+                            "end": [
+                                1,
+                                32
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'A string with \"double\" quotes' string",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "string.js"
+    ],
+    "sha1": "27d40a59d34bcf26ccd02b06f857c20f85a9df41",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "b18bf04fd766cc584977cd2ba38b84199ab2f62d"
+}
+,{
+    "testCaseDescription": "javascript-string-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "string.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "string.js",
+                            "end": [
+                                1,
+                                42
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'A different string with \"double\" quotes' string",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "string.js"
+    ],
+    "sha1": "b18bf04fd766cc584977cd2ba38b84199ab2f62d",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "6353fa1218bad4624b606cf46bfcd6c18d1e13c2"
+}]

test/corpus/diff-summaries/javascript/subscript-access-assignment.json

@@ -0,0 +1,308 @@
+[{
+    "testCaseDescription": "javascript-subscript-access-assignment-insert-test",
+    "expectedResult": {
+        "changes": {
+            "subscript-access-assignment.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "subscript-access-assignment.js",
+                            "end": [
+                                1,
+                                11
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'y[\"x\"]' assignment",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "subscript-access-assignment.js"
+    ],
+    "sha1": "0286a0f0ca80520eb670a372dbf844ec8357639e",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "8303b810d953c09eec10797a00b3ab66d923e510"
+}
+,{
+    "testCaseDescription": "javascript-subscript-access-assignment-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "subscript-access-assignment.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "subscript-access-assignment.js",
+                            "end": [
+                                1,
+                                11
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'y[\"x\"]' assignment",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "subscript-access-assignment.js",
+                            "end": [
+                                2,
+                                11
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'y[\"x\"]' assignment",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "subscript-access-assignment.js"
+    ],
+    "sha1": "8303b810d953c09eec10797a00b3ab66d923e510",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "3db24d6ecd3ac85657b5c13192208dbc4a86a6bf"
+}
+,{
+    "testCaseDescription": "javascript-subscript-access-assignment-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "subscript-access-assignment.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    10
+                                ],
+                                "name": "subscript-access-assignment.js",
+                                "end": [
+                                    1,
+                                    11
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    10
+                                ],
+                                "name": "subscript-access-assignment.js",
+                                "end": [
+                                    1,
+                                    11
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced '1' with '0' in an assignment to y[\"x\"]",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "subscript-access-assignment.js"
+    ],
+    "sha1": "3db24d6ecd3ac85657b5c13192208dbc4a86a6bf",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "3a74a00c6e3ef58372e16138057561bbdaaa9e09"
+}
+,{
+    "testCaseDescription": "javascript-subscript-access-assignment-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "subscript-access-assignment.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    10
+                                ],
+                                "name": "subscript-access-assignment.js",
+                                "end": [
+                                    1,
+                                    11
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    10
+                                ],
+                                "name": "subscript-access-assignment.js",
+                                "end": [
+                                    1,
+                                    11
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced '0' with '1' in an assignment to y[\"x\"]",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "subscript-access-assignment.js"
+    ],
+    "sha1": "3a74a00c6e3ef58372e16138057561bbdaaa9e09",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "59489169d3ee84ebaebab0a32db21de5feda9b9b"
+}
+,{
+    "testCaseDescription": "javascript-subscript-access-assignment-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "subscript-access-assignment.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "subscript-access-assignment.js",
+                            "end": [
+                                1,
+                                11
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'y[\"x\"]' assignment",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "subscript-access-assignment.js",
+                            "end": [
+                                2,
+                                11
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'y[\"x\"]' assignment",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "subscript-access-assignment.js",
+                            "end": [
+                                2,
+                                11
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'y[\"x\"]' assignment",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "subscript-access-assignment.js"
+    ],
+    "sha1": "59489169d3ee84ebaebab0a32db21de5feda9b9b",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "37120ecde944db661969f1cedbda2aa0796858eb"
+}
+,{
+    "testCaseDescription": "javascript-subscript-access-assignment-delete-test",
+    "expectedResult": {
+        "changes": {
+            "subscript-access-assignment.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "subscript-access-assignment.js",
+                            "end": [
+                                1,
+                                11
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'y[\"x\"]' assignment",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "subscript-access-assignment.js"
+    ],
+    "sha1": "37120ecde944db661969f1cedbda2aa0796858eb",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "8632cbda9073b25b4a495c242641b1eb01d4a260"
+}
+,{
+    "testCaseDescription": "javascript-subscript-access-assignment-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "subscript-access-assignment.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "subscript-access-assignment.js",
+                            "end": [
+                                1,
+                                11
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'y[\"x\"]' assignment",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "subscript-access-assignment.js"
+    ],
+    "sha1": "8632cbda9073b25b4a495c242641b1eb01d4a260",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "ea966e7428b15b541246b765517db3f0ef1c6af8"
+}]

test/corpus/diff-summaries/javascript/subscript-access-string.json

@@ -0,0 +1,308 @@
+[{
+    "testCaseDescription": "javascript-subscript-access-string-insert-test",
+    "expectedResult": {
+        "changes": {
+            "subscript-access-string.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "subscript-access-string.js",
+                            "end": [
+                                1,
+                                17
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'x[\"some-string\"]' subscript access",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "subscript-access-string.js"
+    ],
+    "sha1": "b5a7a5a17e38194441efeaf2ddc572cf612a050c",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "ab035d165637ae2f6549f91b23cb3d8397086a5b"
+}
+,{
+    "testCaseDescription": "javascript-subscript-access-string-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "subscript-access-string.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "subscript-access-string.js",
+                            "end": [
+                                1,
+                                23
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'x[\"some-other-string\"]' subscript access",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "subscript-access-string.js",
+                            "end": [
+                                2,
+                                17
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'x[\"some-string\"]' subscript access",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "subscript-access-string.js"
+    ],
+    "sha1": "ab035d165637ae2f6549f91b23cb3d8397086a5b",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "6a0dd5ec60be73dd88995bbf2fc987895204fd69"
+}
+,{
+    "testCaseDescription": "javascript-subscript-access-string-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "subscript-access-string.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    3
+                                ],
+                                "name": "subscript-access-string.js",
+                                "end": [
+                                    1,
+                                    22
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    3
+                                ],
+                                "name": "subscript-access-string.js",
+                                "end": [
+                                    1,
+                                    16
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the \"some-other-string\" string with the \"some-string\" string in the x[\"some-string\"] subscript access",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "subscript-access-string.js"
+    ],
+    "sha1": "6a0dd5ec60be73dd88995bbf2fc987895204fd69",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "cf1ef60479b2d9c834590a4c6f4f7717a657e1cd"
+}
+,{
+    "testCaseDescription": "javascript-subscript-access-string-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "subscript-access-string.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    3
+                                ],
+                                "name": "subscript-access-string.js",
+                                "end": [
+                                    1,
+                                    16
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    3
+                                ],
+                                "name": "subscript-access-string.js",
+                                "end": [
+                                    1,
+                                    22
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the \"some-string\" string with the \"some-other-string\" string in the x[\"some-other-string\"] subscript access",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "subscript-access-string.js"
+    ],
+    "sha1": "cf1ef60479b2d9c834590a4c6f4f7717a657e1cd",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "c476a25c1998c3c480523c8179b29584ad2e00a3"
+}
+,{
+    "testCaseDescription": "javascript-subscript-access-string-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "subscript-access-string.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "subscript-access-string.js",
+                            "end": [
+                                1,
+                                23
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'x[\"some-other-string\"]' subscript access",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "subscript-access-string.js",
+                            "end": [
+                                2,
+                                17
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'x[\"some-string\"]' subscript access",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "subscript-access-string.js",
+                            "end": [
+                                2,
+                                23
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'x[\"some-other-string\"]' subscript access",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "subscript-access-string.js"
+    ],
+    "sha1": "c476a25c1998c3c480523c8179b29584ad2e00a3",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "2f049bd94a6e832b099c647e31ee0a028fa26051"
+}
+,{
+    "testCaseDescription": "javascript-subscript-access-string-delete-test",
+    "expectedResult": {
+        "changes": {
+            "subscript-access-string.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "subscript-access-string.js",
+                            "end": [
+                                1,
+                                17
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'x[\"some-string\"]' subscript access",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "subscript-access-string.js"
+    ],
+    "sha1": "2f049bd94a6e832b099c647e31ee0a028fa26051",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "a88fd09203e1ffb45ef9d0b5a916150099d2f0d7"
+}
+,{
+    "testCaseDescription": "javascript-subscript-access-string-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "subscript-access-string.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "subscript-access-string.js",
+                            "end": [
+                                1,
+                                23
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'x[\"some-other-string\"]' subscript access",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "subscript-access-string.js"
+    ],
+    "sha1": "a88fd09203e1ffb45ef9d0b5a916150099d2f0d7",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "07c5dd47cd837cd06d7d034c049ea6002a5e0980"
+}]

test/corpus/diff-summaries/javascript/subscript-access-variable.json

@@ -0,0 +1,308 @@
+[{
+    "testCaseDescription": "javascript-subscript-access-variable-insert-test",
+    "expectedResult": {
+        "changes": {
+            "subscript-access-variable.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "subscript-access-variable.js",
+                            "end": [
+                                1,
+                                16
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'x[someVariable]' subscript access",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "subscript-access-variable.js"
+    ],
+    "sha1": "c77d21ce31ff19818614b186e90aa577cc20ce9d",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "4d5dda84d5715cb19e8562fa86ec775ad7bc3b52"
+}
+,{
+    "testCaseDescription": "javascript-subscript-access-variable-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "subscript-access-variable.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "subscript-access-variable.js",
+                            "end": [
+                                1,
+                                21
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'x[someOtherVariable]' subscript access",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "subscript-access-variable.js",
+                            "end": [
+                                2,
+                                16
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'x[someVariable]' subscript access",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "subscript-access-variable.js"
+    ],
+    "sha1": "4d5dda84d5715cb19e8562fa86ec775ad7bc3b52",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "a73be8ec6fa12c27b78977f88cde47c3131f85a0"
+}
+,{
+    "testCaseDescription": "javascript-subscript-access-variable-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "subscript-access-variable.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    3
+                                ],
+                                "name": "subscript-access-variable.js",
+                                "end": [
+                                    1,
+                                    20
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    3
+                                ],
+                                "name": "subscript-access-variable.js",
+                                "end": [
+                                    1,
+                                    15
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'someOtherVariable' identifier with the 'someVariable' identifier in the x[someVariable] subscript access",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "subscript-access-variable.js"
+    ],
+    "sha1": "a73be8ec6fa12c27b78977f88cde47c3131f85a0",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "b1f52c7fa0096992d231a1a96f2d3c6bd350a948"
+}
+,{
+    "testCaseDescription": "javascript-subscript-access-variable-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "subscript-access-variable.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    3
+                                ],
+                                "name": "subscript-access-variable.js",
+                                "end": [
+                                    1,
+                                    15
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    3
+                                ],
+                                "name": "subscript-access-variable.js",
+                                "end": [
+                                    1,
+                                    20
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'someVariable' identifier with the 'someOtherVariable' identifier in the x[someOtherVariable] subscript access",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "subscript-access-variable.js"
+    ],
+    "sha1": "b1f52c7fa0096992d231a1a96f2d3c6bd350a948",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "d7d36537db64ed980915c9fd7438eb28aca9121a"
+}
+,{
+    "testCaseDescription": "javascript-subscript-access-variable-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "subscript-access-variable.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "subscript-access-variable.js",
+                            "end": [
+                                1,
+                                21
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'x[someOtherVariable]' subscript access",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "subscript-access-variable.js",
+                            "end": [
+                                2,
+                                16
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'x[someVariable]' subscript access",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "subscript-access-variable.js",
+                            "end": [
+                                2,
+                                21
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'x[someOtherVariable]' subscript access",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "subscript-access-variable.js"
+    ],
+    "sha1": "d7d36537db64ed980915c9fd7438eb28aca9121a",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "39e4553a4dc76006a19f6907144fe12affe9b3bf"
+}
+,{
+    "testCaseDescription": "javascript-subscript-access-variable-delete-test",
+    "expectedResult": {
+        "changes": {
+            "subscript-access-variable.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "subscript-access-variable.js",
+                            "end": [
+                                1,
+                                16
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'x[someVariable]' subscript access",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "subscript-access-variable.js"
+    ],
+    "sha1": "39e4553a4dc76006a19f6907144fe12affe9b3bf",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "579578d94e6d3639fef8ef66a5c71d990e4f7a95"
+}
+,{
+    "testCaseDescription": "javascript-subscript-access-variable-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "subscript-access-variable.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "subscript-access-variable.js",
+                            "end": [
+                                1,
+                                21
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'x[someOtherVariable]' subscript access",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "subscript-access-variable.js"
+    ],
+    "sha1": "579578d94e6d3639fef8ef66a5c71d990e4f7a95",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "b5a7a5a17e38194441efeaf2ddc572cf612a050c"
+}]

test/corpus/diff-summaries/javascript/switch-statement.json

@@ -0,0 +1,368 @@
+[{
+    "testCaseDescription": "javascript-switch-statement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "switch-statement.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "switch-statement.js",
+                            "end": [
+                                1,
+                                48
+                            ]
+                        }
+                    },
+                    "summary": "Added the '1' switch statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "switch-statement.js"
+    ],
+    "sha1": "df276ed5f435d4cf1363008ae573ea99ba39e175",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "e906cd9ad5ab469f68df1fd23910bbe78a9f8cd1"
+}
+,{
+    "testCaseDescription": "javascript-switch-statement-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "switch-statement.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "switch-statement.js",
+                            "end": [
+                                1,
+                                48
+                            ]
+                        }
+                    },
+                    "summary": "Added the '2' switch statement",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "switch-statement.js",
+                            "end": [
+                                2,
+                                48
+                            ]
+                        }
+                    },
+                    "summary": "Added the '1' switch statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "switch-statement.js"
+    ],
+    "sha1": "e906cd9ad5ab469f68df1fd23910bbe78a9f8cd1",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "b5602de388c92c96c7f62e0fcf1cce07b403c185"
+}
+,{
+    "testCaseDescription": "javascript-switch-statement-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "switch-statement.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    9
+                                ],
+                                "name": "switch-statement.js",
+                                "end": [
+                                    1,
+                                    10
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    9
+                                ],
+                                "name": "switch-statement.js",
+                                "end": [
+                                    1,
+                                    10
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced '2' with '1'",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    33
+                                ],
+                                "name": "switch-statement.js",
+                                "end": [
+                                    1,
+                                    34
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    33
+                                ],
+                                "name": "switch-statement.js",
+                                "end": [
+                                    1,
+                                    34
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced '2' with '1'",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "switch-statement.js"
+    ],
+    "sha1": "b5602de388c92c96c7f62e0fcf1cce07b403c185",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "fa74d55721267c11d2be5de262e9eb3100ba91f0"
+}
+,{
+    "testCaseDescription": "javascript-switch-statement-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "switch-statement.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    9
+                                ],
+                                "name": "switch-statement.js",
+                                "end": [
+                                    1,
+                                    10
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    9
+                                ],
+                                "name": "switch-statement.js",
+                                "end": [
+                                    1,
+                                    10
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced '1' with '2'",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    33
+                                ],
+                                "name": "switch-statement.js",
+                                "end": [
+                                    1,
+                                    34
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    33
+                                ],
+                                "name": "switch-statement.js",
+                                "end": [
+                                    1,
+                                    34
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced '1' with '2'",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "switch-statement.js"
+    ],
+    "sha1": "fa74d55721267c11d2be5de262e9eb3100ba91f0",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "14d176ab7a67005a68ef8e96781993f1e9e8aff0"
+}
+,{
+    "testCaseDescription": "javascript-switch-statement-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "switch-statement.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "switch-statement.js",
+                            "end": [
+                                1,
+                                48
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the '2' switch statement",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "switch-statement.js",
+                            "end": [
+                                2,
+                                48
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the '1' switch statement",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "switch-statement.js",
+                            "end": [
+                                2,
+                                48
+                            ]
+                        }
+                    },
+                    "summary": "Added the '2' switch statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "switch-statement.js"
+    ],
+    "sha1": "14d176ab7a67005a68ef8e96781993f1e9e8aff0",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "f3c50550c25a6a350e336bcb4acb19efaee5784b"
+}
+,{
+    "testCaseDescription": "javascript-switch-statement-delete-test",
+    "expectedResult": {
+        "changes": {
+            "switch-statement.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "switch-statement.js",
+                            "end": [
+                                1,
+                                48
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the '1' switch statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "switch-statement.js"
+    ],
+    "sha1": "f3c50550c25a6a350e336bcb4acb19efaee5784b",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "43e7f35abe631d346d4a6d0b20df2215a9844b2a"
+}
+,{
+    "testCaseDescription": "javascript-switch-statement-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "switch-statement.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "switch-statement.js",
+                            "end": [
+                                1,
+                                48
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the '2' switch statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "switch-statement.js"
+    ],
+    "sha1": "43e7f35abe631d346d4a6d0b20df2215a9844b2a",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "ef9e2caec95767f4944840fd5db7f43806b65d4e"
+}]

test/corpus/diff-summaries/javascript/template-string.json

@@ -0,0 +1,308 @@
+[{
+    "testCaseDescription": "javascript-template-string-insert-test",
+    "expectedResult": {
+        "changes": {
+            "template-string.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "template-string.js",
+                            "end": [
+                                1,
+                                11
+                            ]
+                        }
+                    },
+                    "summary": "Added the '`one line`' template string",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "template-string.js"
+    ],
+    "sha1": "125f2e2e8e65a10784e72bb113319c805d4f42ac",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "a3356557da2051db1550e86d98e0125c04a76786"
+}
+,{
+    "testCaseDescription": "javascript-template-string-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "template-string.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "template-string.js",
+                            "end": [
+                                1,
+                                13
+                            ]
+                        }
+                    },
+                    "summary": "Added the '`multi line`' template string",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "template-string.js",
+                            "end": [
+                                2,
+                                11
+                            ]
+                        }
+                    },
+                    "summary": "Added the '`one line`' template string",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "template-string.js"
+    ],
+    "sha1": "a3356557da2051db1550e86d98e0125c04a76786",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "90c33afc22831d46016cae3ef48184f5181a3209"
+}
+,{
+    "testCaseDescription": "javascript-template-string-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "template-string.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    1
+                                ],
+                                "name": "template-string.js",
+                                "end": [
+                                    1,
+                                    13
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    1
+                                ],
+                                "name": "template-string.js",
+                                "end": [
+                                    1,
+                                    11
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the '`multi line`' template string with the '`one line`' template string",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "template-string.js"
+    ],
+    "sha1": "90c33afc22831d46016cae3ef48184f5181a3209",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "41c65d10f9fd1e98f553137da5ac3ec04a6e816a"
+}
+,{
+    "testCaseDescription": "javascript-template-string-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "template-string.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    1
+                                ],
+                                "name": "template-string.js",
+                                "end": [
+                                    1,
+                                    11
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    1
+                                ],
+                                "name": "template-string.js",
+                                "end": [
+                                    1,
+                                    13
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the '`one line`' template string with the '`multi line`' template string",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "template-string.js"
+    ],
+    "sha1": "41c65d10f9fd1e98f553137da5ac3ec04a6e816a",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "1f70c585f7fd042fbc6d4318040f4cf1346a8f6d"
+}
+,{
+    "testCaseDescription": "javascript-template-string-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "template-string.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "template-string.js",
+                            "end": [
+                                1,
+                                13
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the '`multi line`' template string",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "template-string.js",
+                            "end": [
+                                2,
+                                11
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the '`one line`' template string",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "template-string.js",
+                            "end": [
+                                2,
+                                13
+                            ]
+                        }
+                    },
+                    "summary": "Added the '`multi line`' template string",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "template-string.js"
+    ],
+    "sha1": "1f70c585f7fd042fbc6d4318040f4cf1346a8f6d",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "53609feaa56d71f8929c26bf0653e4559ed8baa4"
+}
+,{
+    "testCaseDescription": "javascript-template-string-delete-test",
+    "expectedResult": {
+        "changes": {
+            "template-string.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "template-string.js",
+                            "end": [
+                                1,
+                                11
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the '`one line`' template string",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "template-string.js"
+    ],
+    "sha1": "53609feaa56d71f8929c26bf0653e4559ed8baa4",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "bc277e6624d14eb866c65fb7668dcd6a678b9eaa"
+}
+,{
+    "testCaseDescription": "javascript-template-string-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "template-string.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "template-string.js",
+                            "end": [
+                                1,
+                                13
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the '`multi line`' template string",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "template-string.js"
+    ],
+    "sha1": "bc277e6624d14eb866c65fb7668dcd6a678b9eaa",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "2017d7a8b91c62e06d4de3654b0a7a2d550e55b9"
+}]

test/corpus/diff-summaries/javascript/ternary.json

@@ -0,0 +1,316 @@
+[{
+    "testCaseDescription": "javascript-ternary-insert-test",
+    "expectedResult": {
+        "changes": {
+            "ternary.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "ternary.js",
+                            "end": [
+                                1,
+                                26
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'condition' ternary expression",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "ternary.js"
+    ],
+    "sha1": "7d593b800284097a4d4f70fe25aebef1cbbe69c3",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "df07d4313d01aaa48070484b81a515d4b38e229b"
+}
+,{
+    "testCaseDescription": "javascript-ternary-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "ternary.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "ternary.js",
+                            "end": [
+                                1,
+                                51
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'x.y' assignment",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "ternary.js",
+                            "end": [
+                                2,
+                                26
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'condition' ternary expression",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "ternary.js"
+    ],
+    "sha1": "df07d4313d01aaa48070484b81a515d4b38e229b",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "d816f96bfa4a4e3f7d2fed8a1873e45aba4793cb"
+}
+,{
+    "testCaseDescription": "javascript-ternary-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "ternary.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "ternary.js",
+                            "end": [
+                                1,
+                                26
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'condition' ternary expression",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "ternary.js",
+                            "end": [
+                                1,
+                                51
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'x.y' assignment",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "ternary.js"
+    ],
+    "sha1": "d816f96bfa4a4e3f7d2fed8a1873e45aba4793cb",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "7a965762c520641e9bed35cf4f64a0d7aa2caf9d"
+}
+,{
+    "testCaseDescription": "javascript-ternary-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "ternary.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "ternary.js",
+                            "end": [
+                                1,
+                                51
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'x.y' assignment",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "ternary.js",
+                            "end": [
+                                1,
+                                26
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'condition' ternary expression",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "ternary.js"
+    ],
+    "sha1": "7a965762c520641e9bed35cf4f64a0d7aa2caf9d",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "d5904189993b67d55a85720cfe76815ef2861496"
+}
+,{
+    "testCaseDescription": "javascript-ternary-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "ternary.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "ternary.js",
+                            "end": [
+                                1,
+                                51
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'x.y' assignment",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "ternary.js",
+                            "end": [
+                                2,
+                                26
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'condition' ternary expression",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "ternary.js",
+                            "end": [
+                                2,
+                                51
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'x.y' assignment",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "ternary.js"
+    ],
+    "sha1": "d5904189993b67d55a85720cfe76815ef2861496",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "e7d084239ead8cbe5eb51443a181c7d43f0458aa"
+}
+,{
+    "testCaseDescription": "javascript-ternary-delete-test",
+    "expectedResult": {
+        "changes": {
+            "ternary.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "ternary.js",
+                            "end": [
+                                1,
+                                26
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'condition' ternary expression",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "ternary.js"
+    ],
+    "sha1": "e7d084239ead8cbe5eb51443a181c7d43f0458aa",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "6feb3f80562f534aaef7a5c3814f69c8b509b487"
+}
+,{
+    "testCaseDescription": "javascript-ternary-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "ternary.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "ternary.js",
+                            "end": [
+                                1,
+                                51
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'x.y' assignment",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "ternary.js"
+    ],
+    "sha1": "6feb3f80562f534aaef7a5c3814f69c8b509b487",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "10e446483f5cfbc3b6a595cf22bcd8e5b4b7fa1f"
+}]

test/corpus/diff-summaries/javascript/this-expression.json

@@ -0,0 +1,316 @@
+[{
+    "testCaseDescription": "javascript-this-expression-insert-test",
+    "expectedResult": {
+        "changes": {
+            "this-expression.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "this-expression.js",
+                            "end": [
+                                1,
+                                5
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'this' identifier",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "this-expression.js"
+    ],
+    "sha1": "ebab90bd29d724f6dda4d39a32a6fa7d0b9adf52",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "e28cc543f4228740ad7e5b4680afb8cbf9c51243"
+}
+,{
+    "testCaseDescription": "javascript-this-expression-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "this-expression.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "this-expression.js",
+                            "end": [
+                                1,
+                                13
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'this' return statement",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "this-expression.js",
+                            "end": [
+                                2,
+                                5
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'this' identifier",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "this-expression.js"
+    ],
+    "sha1": "e28cc543f4228740ad7e5b4680afb8cbf9c51243",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "552578420a183fd55293708a7cc2b243ca1d657e"
+}
+,{
+    "testCaseDescription": "javascript-this-expression-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "this-expression.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "this-expression.js",
+                            "end": [
+                                1,
+                                5
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'this' identifier",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "this-expression.js",
+                            "end": [
+                                1,
+                                13
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'this' return statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "this-expression.js"
+    ],
+    "sha1": "552578420a183fd55293708a7cc2b243ca1d657e",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "39b0ac559626f4dc67b1e083a93a785c50ba88f6"
+}
+,{
+    "testCaseDescription": "javascript-this-expression-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "this-expression.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "this-expression.js",
+                            "end": [
+                                1,
+                                13
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'this' return statement",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "this-expression.js",
+                            "end": [
+                                1,
+                                5
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'this' identifier",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "this-expression.js"
+    ],
+    "sha1": "39b0ac559626f4dc67b1e083a93a785c50ba88f6",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "1792d3469977ef42255a501612f9ab858d918c65"
+}
+,{
+    "testCaseDescription": "javascript-this-expression-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "this-expression.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "this-expression.js",
+                            "end": [
+                                1,
+                                13
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'this' return statement",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "this-expression.js",
+                            "end": [
+                                2,
+                                5
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'this' identifier",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "this-expression.js",
+                            "end": [
+                                2,
+                                13
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'this' return statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "this-expression.js"
+    ],
+    "sha1": "1792d3469977ef42255a501612f9ab858d918c65",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "1153598d3f6368a7cada09f10d73306a6e6857a3"
+}
+,{
+    "testCaseDescription": "javascript-this-expression-delete-test",
+    "expectedResult": {
+        "changes": {
+            "this-expression.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "this-expression.js",
+                            "end": [
+                                1,
+                                5
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'this' identifier",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "this-expression.js"
+    ],
+    "sha1": "1153598d3f6368a7cada09f10d73306a6e6857a3",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "d2ae1e6938e47ab5b41d0eb89fb0cd1087445e06"
+}
+,{
+    "testCaseDescription": "javascript-this-expression-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "this-expression.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "this-expression.js",
+                            "end": [
+                                1,
+                                13
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'this' return statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "this-expression.js"
+    ],
+    "sha1": "d2ae1e6938e47ab5b41d0eb89fb0cd1087445e06",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "11a27a81f8e7e33aac2eb0844d3465acf8f9bb0d"
+}]

test/corpus/diff-summaries/javascript/throw-statement.json

@@ -0,0 +1,308 @@
+[{
+    "testCaseDescription": "javascript-throw-statement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "throw-statement.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "throw-statement.js",
+                            "end": [
+                                1,
+                                26
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'new Error(\"uh oh\")' throw statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "throw-statement.js"
+    ],
+    "sha1": "ef9e2caec95767f4944840fd5db7f43806b65d4e",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "e8ffd161fc105086e8c085de252fd15f1582df33"
+}
+,{
+    "testCaseDescription": "javascript-throw-statement-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "throw-statement.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "throw-statement.js",
+                            "end": [
+                                1,
+                                29
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'new Error(\"oooooops\")' throw statement",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "throw-statement.js",
+                            "end": [
+                                2,
+                                26
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'new Error(\"uh oh\")' throw statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "throw-statement.js"
+    ],
+    "sha1": "e8ffd161fc105086e8c085de252fd15f1582df33",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "0ff2edba17e3040f87a6685ed6ea554a4f520254"
+}
+,{
+    "testCaseDescription": "javascript-throw-statement-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "throw-statement.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    17
+                                ],
+                                "name": "throw-statement.js",
+                                "end": [
+                                    1,
+                                    27
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    17
+                                ],
+                                "name": "throw-statement.js",
+                                "end": [
+                                    1,
+                                    24
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the \"oooooops\" string with the \"uh oh\" string in the Error(\"uh oh\") function call",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "throw-statement.js"
+    ],
+    "sha1": "0ff2edba17e3040f87a6685ed6ea554a4f520254",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "911f32d28e0aa19e34646b9917cdcf6eb51b16f0"
+}
+,{
+    "testCaseDescription": "javascript-throw-statement-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "throw-statement.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    17
+                                ],
+                                "name": "throw-statement.js",
+                                "end": [
+                                    1,
+                                    24
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    17
+                                ],
+                                "name": "throw-statement.js",
+                                "end": [
+                                    1,
+                                    27
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the \"uh oh\" string with the \"oooooops\" string in the Error(\"oooooops\") function call",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "throw-statement.js"
+    ],
+    "sha1": "911f32d28e0aa19e34646b9917cdcf6eb51b16f0",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "441deaae5ebff81f6802d5e2f9f4ae276db41c3b"
+}
+,{
+    "testCaseDescription": "javascript-throw-statement-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "throw-statement.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "throw-statement.js",
+                            "end": [
+                                1,
+                                29
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'new Error(\"oooooops\")' throw statement",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "throw-statement.js",
+                            "end": [
+                                2,
+                                26
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'new Error(\"uh oh\")' throw statement",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "throw-statement.js",
+                            "end": [
+                                2,
+                                29
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'new Error(\"oooooops\")' throw statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "throw-statement.js"
+    ],
+    "sha1": "441deaae5ebff81f6802d5e2f9f4ae276db41c3b",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "753074bc4ed4fbcc549b57307a13bc068a4dc0ff"
+}
+,{
+    "testCaseDescription": "javascript-throw-statement-delete-test",
+    "expectedResult": {
+        "changes": {
+            "throw-statement.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "throw-statement.js",
+                            "end": [
+                                1,
+                                26
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'new Error(\"uh oh\")' throw statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "throw-statement.js"
+    ],
+    "sha1": "753074bc4ed4fbcc549b57307a13bc068a4dc0ff",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "41cdf55b68dce5bdc74df0f541995f9603d2014d"
+}
+,{
+    "testCaseDescription": "javascript-throw-statement-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "throw-statement.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "throw-statement.js",
+                            "end": [
+                                1,
+                                29
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'new Error(\"oooooops\")' throw statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "throw-statement.js"
+    ],
+    "sha1": "41cdf55b68dce5bdc74df0f541995f9603d2014d",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "8853e12eb348f42061f28c7a65748dd8c2b6cdda"
+}]

test/corpus/diff-summaries/javascript/true.json

@@ -0,0 +1,316 @@
+[{
+    "testCaseDescription": "javascript-true-insert-test",
+    "expectedResult": {
+        "changes": {
+            "true.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "true.js",
+                            "end": [
+                                1,
+                                5
+                            ]
+                        }
+                    },
+                    "summary": "Added 'true'",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "true.js"
+    ],
+    "sha1": "c40f78d8ec9a8873d55c8d368978e674c1dfc2d8",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "656b27635a5debd119ebc672643c188946ff6963"
+}
+,{
+    "testCaseDescription": "javascript-true-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "true.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "true.js",
+                            "end": [
+                                1,
+                                13
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'true' return statement",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "true.js",
+                            "end": [
+                                2,
+                                5
+                            ]
+                        }
+                    },
+                    "summary": "Added 'true'",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "true.js"
+    ],
+    "sha1": "656b27635a5debd119ebc672643c188946ff6963",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "63973077f6a477896c7a929a14079bf4bbaadb30"
+}
+,{
+    "testCaseDescription": "javascript-true-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "true.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "true.js",
+                            "end": [
+                                1,
+                                5
+                            ]
+                        }
+                    },
+                    "summary": "Added 'true'",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "true.js",
+                            "end": [
+                                1,
+                                13
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'true' return statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "true.js"
+    ],
+    "sha1": "63973077f6a477896c7a929a14079bf4bbaadb30",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "3853f8cb4f7f378206fafa6409d03a2630a15f1a"
+}
+,{
+    "testCaseDescription": "javascript-true-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "true.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "true.js",
+                            "end": [
+                                1,
+                                13
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'true' return statement",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "true.js",
+                            "end": [
+                                1,
+                                5
+                            ]
+                        }
+                    },
+                    "summary": "Deleted 'true'",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "true.js"
+    ],
+    "sha1": "3853f8cb4f7f378206fafa6409d03a2630a15f1a",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "e19548511ad78553ec47f28afe71c1b05d3cefb0"
+}
+,{
+    "testCaseDescription": "javascript-true-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "true.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "true.js",
+                            "end": [
+                                1,
+                                13
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'true' return statement",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "true.js",
+                            "end": [
+                                2,
+                                5
+                            ]
+                        }
+                    },
+                    "summary": "Deleted 'true'",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "true.js",
+                            "end": [
+                                2,
+                                13
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'true' return statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "true.js"
+    ],
+    "sha1": "e19548511ad78553ec47f28afe71c1b05d3cefb0",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "551e03fb9cd6912f8f1fa0672eaa64c3c6568bd9"
+}
+,{
+    "testCaseDescription": "javascript-true-delete-test",
+    "expectedResult": {
+        "changes": {
+            "true.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "true.js",
+                            "end": [
+                                1,
+                                5
+                            ]
+                        }
+                    },
+                    "summary": "Deleted 'true'",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "true.js"
+    ],
+    "sha1": "551e03fb9cd6912f8f1fa0672eaa64c3c6568bd9",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "77cbe0371de746912cba103518368ac85987da73"
+}
+,{
+    "testCaseDescription": "javascript-true-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "true.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "true.js",
+                            "end": [
+                                1,
+                                13
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'true' return statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "true.js"
+    ],
+    "sha1": "77cbe0371de746912cba103518368ac85987da73",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "d1241fa4218f33189f78a91a9513ca7e2120a2a0"
+}]

test/corpus/diff-summaries/javascript/try-statement.json

@@ -0,0 +1,368 @@
+[{
+    "testCaseDescription": "javascript-try-statement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "try-statement.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "try-statement.js",
+                            "end": [
+                                1,
+                                39
+                            ]
+                        }
+                    },
+                    "summary": "Added the '{ f; }' try statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "try-statement.js"
+    ],
+    "sha1": "8853e12eb348f42061f28c7a65748dd8c2b6cdda",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "9a940b48df9acd8141dce91926326bb545a35ce9"
+}
+,{
+    "testCaseDescription": "javascript-try-statement-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "try-statement.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "try-statement.js",
+                            "end": [
+                                1,
+                                39
+                            ]
+                        }
+                    },
+                    "summary": "Added the '{ f; }' try statement",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "try-statement.js",
+                            "end": [
+                                2,
+                                39
+                            ]
+                        }
+                    },
+                    "summary": "Added the '{ f; }' try statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "try-statement.js"
+    ],
+    "sha1": "9a940b48df9acd8141dce91926326bb545a35ce9",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "14485b720f542fc02c659aeb388d28a4f23d5eca"
+}
+,{
+    "testCaseDescription": "javascript-try-statement-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "try-statement.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    20
+                                ],
+                                "name": "try-statement.js",
+                                "end": [
+                                    1,
+                                    21
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    20
+                                ],
+                                "name": "try-statement.js",
+                                "end": [
+                                    1,
+                                    21
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'h' identifier with the 'g' identifier",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    35
+                                ],
+                                "name": "try-statement.js",
+                                "end": [
+                                    1,
+                                    36
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    35
+                                ],
+                                "name": "try-statement.js",
+                                "end": [
+                                    1,
+                                    36
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'g' identifier with the 'h' identifier",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "try-statement.js"
+    ],
+    "sha1": "14485b720f542fc02c659aeb388d28a4f23d5eca",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "937bc39ba6b5a8ea39d5e70a05aca172340b34b8"
+}
+,{
+    "testCaseDescription": "javascript-try-statement-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "try-statement.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    20
+                                ],
+                                "name": "try-statement.js",
+                                "end": [
+                                    1,
+                                    21
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    20
+                                ],
+                                "name": "try-statement.js",
+                                "end": [
+                                    1,
+                                    21
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'g' identifier with the 'h' identifier",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    35
+                                ],
+                                "name": "try-statement.js",
+                                "end": [
+                                    1,
+                                    36
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    35
+                                ],
+                                "name": "try-statement.js",
+                                "end": [
+                                    1,
+                                    36
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'h' identifier with the 'g' identifier",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "try-statement.js"
+    ],
+    "sha1": "937bc39ba6b5a8ea39d5e70a05aca172340b34b8",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "d5388b993d81d166c72a2c0851cadf209a53e663"
+}
+,{
+    "testCaseDescription": "javascript-try-statement-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "try-statement.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "try-statement.js",
+                            "end": [
+                                1,
+                                39
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the '{ f; }' try statement",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "try-statement.js",
+                            "end": [
+                                2,
+                                39
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the '{ f; }' try statement",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "try-statement.js",
+                            "end": [
+                                2,
+                                39
+                            ]
+                        }
+                    },
+                    "summary": "Added the '{ f; }' try statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "try-statement.js"
+    ],
+    "sha1": "d5388b993d81d166c72a2c0851cadf209a53e663",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "dcc5fa3d3acd27cfef2eab524cd619a2518e375f"
+}
+,{
+    "testCaseDescription": "javascript-try-statement-delete-test",
+    "expectedResult": {
+        "changes": {
+            "try-statement.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "try-statement.js",
+                            "end": [
+                                1,
+                                39
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the '{ f; }' try statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "try-statement.js"
+    ],
+    "sha1": "dcc5fa3d3acd27cfef2eab524cd619a2518e375f",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "4f2e99ffade0f4b59764c6dc000ea251ffd1876b"
+}
+,{
+    "testCaseDescription": "javascript-try-statement-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "try-statement.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "try-statement.js",
+                            "end": [
+                                1,
+                                39
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the '{ f; }' try statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "try-statement.js"
+    ],
+    "sha1": "4f2e99ffade0f4b59764c6dc000ea251ffd1876b",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "87a75eabc61b58f15583babf507419181ab63aeb"
+}]

test/corpus/diff-summaries/javascript/type-operator.json

@@ -0,0 +1,282 @@
+[{
+    "testCaseDescription": "javascript-type-operator-insert-test",
+    "expectedResult": {
+        "changes": {
+            "type-operator.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "type-operator.js",
+                            "end": [
+                                1,
+                                9
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'typeof x' operator",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "type-operator.js"
+    ],
+    "sha1": "10e446483f5cfbc3b6a595cf22bcd8e5b4b7fa1f",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "e824baf85c2455f92ee90fc9344ac39d72a50a14"
+}
+,{
+    "testCaseDescription": "javascript-type-operator-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "type-operator.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "type-operator.js",
+                            "end": [
+                                1,
+                                20
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'x instanceof String' operator",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "type-operator.js",
+                            "end": [
+                                2,
+                                9
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'typeof x' operator",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "type-operator.js"
+    ],
+    "sha1": "e824baf85c2455f92ee90fc9344ac39d72a50a14",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "4c4620dc49de1618fc2688d086a90b0c33b56172"
+}
+,{
+    "testCaseDescription": "javascript-type-operator-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "type-operator.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                14
+                            ],
+                            "name": "type-operator.js",
+                            "end": [
+                                1,
+                                20
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'String' identifier",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "type-operator.js"
+    ],
+    "sha1": "4c4620dc49de1618fc2688d086a90b0c33b56172",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "cb84bfa2a54e105154cc4f64f3edbdec593da924"
+}
+,{
+    "testCaseDescription": "javascript-type-operator-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "type-operator.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                14
+                            ],
+                            "name": "type-operator.js",
+                            "end": [
+                                1,
+                                20
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'String' identifier",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "type-operator.js"
+    ],
+    "sha1": "cb84bfa2a54e105154cc4f64f3edbdec593da924",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "3906b75677e7e34461038b42a7d0eed388638d1a"
+}
+,{
+    "testCaseDescription": "javascript-type-operator-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "type-operator.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "type-operator.js",
+                            "end": [
+                                1,
+                                20
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'x instanceof String' operator",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "type-operator.js",
+                            "end": [
+                                2,
+                                9
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'typeof x' operator",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "type-operator.js",
+                            "end": [
+                                2,
+                                20
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'x instanceof String' operator",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "type-operator.js"
+    ],
+    "sha1": "3906b75677e7e34461038b42a7d0eed388638d1a",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "63321c3a8e510775ad5270c30d3f34d4c513363e"
+}
+,{
+    "testCaseDescription": "javascript-type-operator-delete-test",
+    "expectedResult": {
+        "changes": {
+            "type-operator.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "type-operator.js",
+                            "end": [
+                                1,
+                                9
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'typeof x' operator",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "type-operator.js"
+    ],
+    "sha1": "63321c3a8e510775ad5270c30d3f34d4c513363e",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "553f6f8d42f3dbd74e01e1e8eb376f10010728c5"
+}
+,{
+    "testCaseDescription": "javascript-type-operator-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "type-operator.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "type-operator.js",
+                            "end": [
+                                1,
+                                20
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'x instanceof String' operator",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "type-operator.js"
+    ],
+    "sha1": "553f6f8d42f3dbd74e01e1e8eb376f10010728c5",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "0014c5d8fc3e6f9d08e268ebbb2d42919d5b4991"
+}]

test/corpus/diff-summaries/javascript/undefined.json

@@ -0,0 +1,316 @@
+[{
+    "testCaseDescription": "javascript-undefined-insert-test",
+    "expectedResult": {
+        "changes": {
+            "undefined.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "undefined.js",
+                            "end": [
+                                1,
+                                10
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'undefined' identifier",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "undefined.js"
+    ],
+    "sha1": "43fd131de0f55fa1826e3fa3b95b88b7ba74fd68",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "a733439e831bb4ec5f6387c6ff60a2077a1e487d"
+}
+,{
+    "testCaseDescription": "javascript-undefined-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "undefined.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "undefined.js",
+                            "end": [
+                                1,
+                                18
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'undefined' return statement",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "undefined.js",
+                            "end": [
+                                2,
+                                10
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'undefined' identifier",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "undefined.js"
+    ],
+    "sha1": "a733439e831bb4ec5f6387c6ff60a2077a1e487d",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "9e8bf000f2763e38b7d070a67c4162528edcebcb"
+}
+,{
+    "testCaseDescription": "javascript-undefined-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "undefined.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "undefined.js",
+                            "end": [
+                                1,
+                                10
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'undefined' identifier",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "undefined.js",
+                            "end": [
+                                1,
+                                18
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'undefined' return statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "undefined.js"
+    ],
+    "sha1": "9e8bf000f2763e38b7d070a67c4162528edcebcb",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "f5de1863a90afffbf383144a36564fca6c7702ca"
+}
+,{
+    "testCaseDescription": "javascript-undefined-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "undefined.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "undefined.js",
+                            "end": [
+                                1,
+                                18
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'undefined' return statement",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "undefined.js",
+                            "end": [
+                                1,
+                                10
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'undefined' identifier",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "undefined.js"
+    ],
+    "sha1": "f5de1863a90afffbf383144a36564fca6c7702ca",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "6f6fe3b3395ecaf60ae2e3b9d63f89c332770002"
+}
+,{
+    "testCaseDescription": "javascript-undefined-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "undefined.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "undefined.js",
+                            "end": [
+                                1,
+                                18
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'undefined' return statement",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "undefined.js",
+                            "end": [
+                                2,
+                                10
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'undefined' identifier",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "undefined.js",
+                            "end": [
+                                2,
+                                18
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'undefined' return statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "undefined.js"
+    ],
+    "sha1": "6f6fe3b3395ecaf60ae2e3b9d63f89c332770002",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "7c4790c8d32dd788ebf2c2857d39e88250608ea1"
+}
+,{
+    "testCaseDescription": "javascript-undefined-delete-test",
+    "expectedResult": {
+        "changes": {
+            "undefined.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "undefined.js",
+                            "end": [
+                                1,
+                                10
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'undefined' identifier",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "undefined.js"
+    ],
+    "sha1": "7c4790c8d32dd788ebf2c2857d39e88250608ea1",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "d802c686cf2a1012e7a239acdef816a7eb6b91ae"
+}
+,{
+    "testCaseDescription": "javascript-undefined-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "undefined.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "undefined.js",
+                            "end": [
+                                1,
+                                18
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'undefined' return statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "undefined.js"
+    ],
+    "sha1": "d802c686cf2a1012e7a239acdef816a7eb6b91ae",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "c40f78d8ec9a8873d55c8d368978e674c1dfc2d8"
+}]

test/corpus/diff-summaries/javascript/var-declaration.json

@@ -0,0 +1,512 @@
+[{
+    "testCaseDescription": "javascript-var-declaration-insert-test",
+    "expectedResult": {
+        "changes": {
+            "var-declaration.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                5
+                            ],
+                            "name": "var-declaration.js",
+                            "end": [
+                                1,
+                                10
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'x' variable",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "var-declaration.js"
+    ],
+    "sha1": "a5fb0a1bf511cc98cae35a20ea3a6dad064448bc",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "05bb0ae04ba1c8492dbc8091c77e84e7b8fa3706"
+}
+,{
+    "testCaseDescription": "javascript-var-declaration-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "var-declaration.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                5
+                            ],
+                            "name": "var-declaration.js",
+                            "end": [
+                                1,
+                                6
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'x' variable",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                8
+                            ],
+                            "name": "var-declaration.js",
+                            "end": [
+                                1,
+                                14
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'y' variable",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                16
+                            ],
+                            "name": "var-declaration.js",
+                            "end": [
+                                1,
+                                17
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'z' variable",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                5
+                            ],
+                            "name": "var-declaration.js",
+                            "end": [
+                                2,
+                                10
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'x' variable",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "var-declaration.js"
+    ],
+    "sha1": "05bb0ae04ba1c8492dbc8091c77e84e7b8fa3706",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "390295f402454b7a8a89876ac729014f4c73f6cd"
+}
+,{
+    "testCaseDescription": "javascript-var-declaration-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "var-declaration.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    5
+                                ],
+                                "name": "var-declaration.js",
+                                "end": [
+                                    1,
+                                    6
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    5
+                                ],
+                                "name": "var-declaration.js",
+                                "end": [
+                                    1,
+                                    10
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'x' variable with the 'x' variable",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                8
+                            ],
+                            "name": "var-declaration.js",
+                            "end": [
+                                1,
+                                14
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'y' variable",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                16
+                            ],
+                            "name": "var-declaration.js",
+                            "end": [
+                                1,
+                                17
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'z' variable",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "var-declaration.js"
+    ],
+    "sha1": "390295f402454b7a8a89876ac729014f4c73f6cd",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "ee63d737082c6fcdb3e782d9005591482b25c755"
+}
+,{
+    "testCaseDescription": "javascript-var-declaration-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "var-declaration.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    5
+                                ],
+                                "name": "var-declaration.js",
+                                "end": [
+                                    1,
+                                    10
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    5
+                                ],
+                                "name": "var-declaration.js",
+                                "end": [
+                                    1,
+                                    6
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'x' variable with the 'x' variable",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                8
+                            ],
+                            "name": "var-declaration.js",
+                            "end": [
+                                1,
+                                14
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'y' variable",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                16
+                            ],
+                            "name": "var-declaration.js",
+                            "end": [
+                                1,
+                                17
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'z' variable",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "var-declaration.js"
+    ],
+    "sha1": "ee63d737082c6fcdb3e782d9005591482b25c755",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "14ab5aa6580823b08cde9a0d91e674bf712c4896"
+}
+,{
+    "testCaseDescription": "javascript-var-declaration-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "var-declaration.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                5
+                            ],
+                            "name": "var-declaration.js",
+                            "end": [
+                                1,
+                                6
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'x' variable",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                8
+                            ],
+                            "name": "var-declaration.js",
+                            "end": [
+                                1,
+                                14
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'y' variable",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                16
+                            ],
+                            "name": "var-declaration.js",
+                            "end": [
+                                1,
+                                17
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'z' variable",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                5
+                            ],
+                            "name": "var-declaration.js",
+                            "end": [
+                                2,
+                                10
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'x' variable",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                5
+                            ],
+                            "name": "var-declaration.js",
+                            "end": [
+                                2,
+                                6
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'x' variable",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                8
+                            ],
+                            "name": "var-declaration.js",
+                            "end": [
+                                2,
+                                14
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'y' variable",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                16
+                            ],
+                            "name": "var-declaration.js",
+                            "end": [
+                                2,
+                                17
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'z' variable",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "var-declaration.js"
+    ],
+    "sha1": "14ab5aa6580823b08cde9a0d91e674bf712c4896",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "4949f1ef2caaf01fc368e0fb8010a90a05550c92"
+}
+,{
+    "testCaseDescription": "javascript-var-declaration-delete-test",
+    "expectedResult": {
+        "changes": {
+            "var-declaration.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                5
+                            ],
+                            "name": "var-declaration.js",
+                            "end": [
+                                1,
+                                10
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'x' variable",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "var-declaration.js"
+    ],
+    "sha1": "4949f1ef2caaf01fc368e0fb8010a90a05550c92",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "bedd174ec888f89deff0be9e6cd87ecf1404c2d5"
+}
+,{
+    "testCaseDescription": "javascript-var-declaration-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "var-declaration.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                5
+                            ],
+                            "name": "var-declaration.js",
+                            "end": [
+                                1,
+                                6
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'x' variable",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                8
+                            ],
+                            "name": "var-declaration.js",
+                            "end": [
+                                1,
+                                14
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'y' variable",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                16
+                            ],
+                            "name": "var-declaration.js",
+                            "end": [
+                                1,
+                                17
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'z' variable",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "var-declaration.js"
+    ],
+    "sha1": "bedd174ec888f89deff0be9e6cd87ecf1404c2d5",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "b00fa825ca435ba80830373e95ab22dd77ce9326"
+}]

test/corpus/diff-summaries/javascript/variable.json

@@ -0,0 +1,308 @@
+[{
+    "testCaseDescription": "javascript-variable-insert-test",
+    "expectedResult": {
+        "changes": {
+            "variable.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "variable.js",
+                            "end": [
+                                1,
+                                7
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'theVar' identifier",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "variable.js"
+    ],
+    "sha1": "7cd0762fb1e84cad3dcf9a1c41b07c8112c888fd",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "d997c1093fa0c616e4a65bdb9d406275cdd5802d"
+}
+,{
+    "testCaseDescription": "javascript-variable-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "variable.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "variable.js",
+                            "end": [
+                                1,
+                                8
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'theVar2' identifier",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "variable.js",
+                            "end": [
+                                2,
+                                7
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'theVar' identifier",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "variable.js"
+    ],
+    "sha1": "d997c1093fa0c616e4a65bdb9d406275cdd5802d",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "d53db14bcba93489810bcd1ac51b4b15306a1ae6"
+}
+,{
+    "testCaseDescription": "javascript-variable-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "variable.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    1
+                                ],
+                                "name": "variable.js",
+                                "end": [
+                                    1,
+                                    8
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    1
+                                ],
+                                "name": "variable.js",
+                                "end": [
+                                    1,
+                                    7
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'theVar2' identifier with the 'theVar' identifier",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "variable.js"
+    ],
+    "sha1": "d53db14bcba93489810bcd1ac51b4b15306a1ae6",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "3e07fecc10461c1d47c18a19bea04d61a0dfc83a"
+}
+,{
+    "testCaseDescription": "javascript-variable-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "variable.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    1
+                                ],
+                                "name": "variable.js",
+                                "end": [
+                                    1,
+                                    7
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    1
+                                ],
+                                "name": "variable.js",
+                                "end": [
+                                    1,
+                                    8
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'theVar' identifier with the 'theVar2' identifier",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "variable.js"
+    ],
+    "sha1": "3e07fecc10461c1d47c18a19bea04d61a0dfc83a",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "9a58027ba05317961196f113c79ea9ffad926b20"
+}
+,{
+    "testCaseDescription": "javascript-variable-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "variable.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "variable.js",
+                            "end": [
+                                1,
+                                8
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'theVar2' identifier",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "variable.js",
+                            "end": [
+                                2,
+                                7
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'theVar' identifier",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "variable.js",
+                            "end": [
+                                2,
+                                8
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'theVar2' identifier",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "variable.js"
+    ],
+    "sha1": "9a58027ba05317961196f113c79ea9ffad926b20",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "eaebf72a40c5b5efa51afefa013498ddf1954821"
+}
+,{
+    "testCaseDescription": "javascript-variable-delete-test",
+    "expectedResult": {
+        "changes": {
+            "variable.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "variable.js",
+                            "end": [
+                                1,
+                                7
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'theVar' identifier",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "variable.js"
+    ],
+    "sha1": "eaebf72a40c5b5efa51afefa013498ddf1954821",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "6a047726509cb5ca3ac81e6bff6d14f65205196b"
+}
+,{
+    "testCaseDescription": "javascript-variable-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "variable.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "variable.js",
+                            "end": [
+                                1,
+                                8
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'theVar2' identifier",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "variable.js"
+    ],
+    "sha1": "6a047726509cb5ca3ac81e6bff6d14f65205196b",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "e117ae3f5e0945e0d8e971f7bbc0397229a45648"
+}]

test/corpus/diff-summaries/javascript/void-operator.json

@@ -0,0 +1,308 @@
+[{
+    "testCaseDescription": "javascript-void-operator-insert-test",
+    "expectedResult": {
+        "changes": {
+            "void-operator.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "void-operator.js",
+                            "end": [
+                                1,
+                                9
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'void b()' operator",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "void-operator.js"
+    ],
+    "sha1": "91bb86f2c473fce6ff1ddd4c4e25a6362131920f",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "e235fe3056b7c71256b661b0a336a44da2be1329"
+}
+,{
+    "testCaseDescription": "javascript-void-operator-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "void-operator.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "void-operator.js",
+                            "end": [
+                                1,
+                                9
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'void c()' operator",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "void-operator.js",
+                            "end": [
+                                2,
+                                9
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'void b()' operator",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "void-operator.js"
+    ],
+    "sha1": "e235fe3056b7c71256b661b0a336a44da2be1329",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "f17f509d54fab1faf744a724bea1e6bc45f88ef1"
+}
+,{
+    "testCaseDescription": "javascript-void-operator-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "void-operator.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    6
+                                ],
+                                "name": "void-operator.js",
+                                "end": [
+                                    1,
+                                    7
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    6
+                                ],
+                                "name": "void-operator.js",
+                                "end": [
+                                    1,
+                                    7
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'c' identifier with the 'b' identifier in the b() function call",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "void-operator.js"
+    ],
+    "sha1": "f17f509d54fab1faf744a724bea1e6bc45f88ef1",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "27ce188eaba0b82b104b61399b6d52e85c9f2934"
+}
+,{
+    "testCaseDescription": "javascript-void-operator-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "void-operator.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    6
+                                ],
+                                "name": "void-operator.js",
+                                "end": [
+                                    1,
+                                    7
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    6
+                                ],
+                                "name": "void-operator.js",
+                                "end": [
+                                    1,
+                                    7
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'b' identifier with the 'c' identifier in the c() function call",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "void-operator.js"
+    ],
+    "sha1": "27ce188eaba0b82b104b61399b6d52e85c9f2934",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "b88d743bc3413c7955a22108d0b1c5f52b1eedfd"
+}
+,{
+    "testCaseDescription": "javascript-void-operator-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "void-operator.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "void-operator.js",
+                            "end": [
+                                1,
+                                9
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'void c()' operator",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "void-operator.js",
+                            "end": [
+                                2,
+                                9
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'void b()' operator",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "void-operator.js",
+                            "end": [
+                                2,
+                                9
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'void c()' operator",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "void-operator.js"
+    ],
+    "sha1": "b88d743bc3413c7955a22108d0b1c5f52b1eedfd",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "e77413f973aacde76e8f7b65832eda2e3d83c299"
+}
+,{
+    "testCaseDescription": "javascript-void-operator-delete-test",
+    "expectedResult": {
+        "changes": {
+            "void-operator.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "void-operator.js",
+                            "end": [
+                                1,
+                                9
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'void b()' operator",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "void-operator.js"
+    ],
+    "sha1": "e77413f973aacde76e8f7b65832eda2e3d83c299",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "57baa35e51004dd414a0bc651d9bb199d393d9a8"
+}
+,{
+    "testCaseDescription": "javascript-void-operator-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "void-operator.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "void-operator.js",
+                            "end": [
+                                1,
+                                9
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'void c()' operator",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "void-operator.js"
+    ],
+    "sha1": "57baa35e51004dd414a0bc651d9bb199d393d9a8",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "74f192419bb6a3a7ef68bb5eb4cf71e89e09b919"
+}]

test/corpus/diff-summaries/javascript/while-statement.json

@@ -0,0 +1,368 @@
+[{
+    "testCaseDescription": "javascript-while-statement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "while-statement.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "while-statement.js",
+                            "end": [
+                                1,
+                                19
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'a' while statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "while-statement.js"
+    ],
+    "sha1": "1e95946698829d93a91686c01b91618eb065b077",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "003db95c9c468101af6b2a4d74708ad5cfcaeac3"
+}
+,{
+    "testCaseDescription": "javascript-while-statement-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "while-statement.js": [
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "while-statement.js",
+                            "end": [
+                                1,
+                                19
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'b' while statement",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "while-statement.js",
+                            "end": [
+                                2,
+                                19
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'a' while statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "while-statement.js"
+    ],
+    "sha1": "003db95c9c468101af6b2a4d74708ad5cfcaeac3",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "898d1deeb737fc056929282ccce44a7aaef55034"
+}
+,{
+    "testCaseDescription": "javascript-while-statement-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "while-statement.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    8
+                                ],
+                                "name": "while-statement.js",
+                                "end": [
+                                    1,
+                                    9
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    8
+                                ],
+                                "name": "while-statement.js",
+                                "end": [
+                                    1,
+                                    9
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'b' identifier with the 'a' identifier",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    13
+                                ],
+                                "name": "while-statement.js",
+                                "end": [
+                                    1,
+                                    14
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    13
+                                ],
+                                "name": "while-statement.js",
+                                "end": [
+                                    1,
+                                    14
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'a' identifier with the 'b' identifier in the b() function call",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "while-statement.js"
+    ],
+    "sha1": "898d1deeb737fc056929282ccce44a7aaef55034",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "77e4e9b64b3327f448bb03592ae0db023aa4aa1d"
+}
+,{
+    "testCaseDescription": "javascript-while-statement-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "while-statement.js": [
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    8
+                                ],
+                                "name": "while-statement.js",
+                                "end": [
+                                    1,
+                                    9
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    8
+                                ],
+                                "name": "while-statement.js",
+                                "end": [
+                                    1,
+                                    9
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'a' identifier with the 'b' identifier",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "these": [
+                            {
+                                "start": [
+                                    1,
+                                    13
+                                ],
+                                "name": "while-statement.js",
+                                "end": [
+                                    1,
+                                    14
+                                ]
+                            },
+                            {
+                                "start": [
+                                    1,
+                                    13
+                                ],
+                                "name": "while-statement.js",
+                                "end": [
+                                    1,
+                                    14
+                                ]
+                            }
+                        ]
+                    },
+                    "summary": "Replaced the 'b' identifier with the 'a' identifier in the a() function call",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "while-statement.js"
+    ],
+    "sha1": "77e4e9b64b3327f448bb03592ae0db023aa4aa1d",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "6c00977dc68dc8709bce328c2cc8bfb7205793ff"
+}
+,{
+    "testCaseDescription": "javascript-while-statement-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "while-statement.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "while-statement.js",
+                            "end": [
+                                1,
+                                19
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'b' while statement",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "while-statement.js",
+                            "end": [
+                                2,
+                                19
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'a' while statement",
+                    "tag": "JSONSummary"
+                },
+                {
+                    "span": {
+                        "that": {
+                            "start": [
+                                2,
+                                1
+                            ],
+                            "name": "while-statement.js",
+                            "end": [
+                                2,
+                                19
+                            ]
+                        }
+                    },
+                    "summary": "Added the 'b' while statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "while-statement.js"
+    ],
+    "sha1": "6c00977dc68dc8709bce328c2cc8bfb7205793ff",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "494bd2f0826ef9bb743f7873c597ed76a7714ec8"
+}
+,{
+    "testCaseDescription": "javascript-while-statement-delete-test",
+    "expectedResult": {
+        "changes": {
+            "while-statement.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "while-statement.js",
+                            "end": [
+                                1,
+                                19
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'a' while statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "while-statement.js"
+    ],
+    "sha1": "494bd2f0826ef9bb743f7873c597ed76a7714ec8",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "98b4204c2fe7fb408f6c5911ce1a275af862f443"
+}
+,{
+    "testCaseDescription": "javascript-while-statement-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "while-statement.js": [
+                {
+                    "span": {
+                        "this": {
+                            "start": [
+                                1,
+                                1
+                            ],
+                            "name": "while-statement.js",
+                            "end": [
+                                1,
+                                19
+                            ]
+                        }
+                    },
+                    "summary": "Deleted the 'b' while statement",
+                    "tag": "JSONSummary"
+                }
+            ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "while-statement.js"
+    ],
+    "sha1": "98b4204c2fe7fb408f6c5911ce1a275af862f443",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "a373c4a7201be2aa145e60cf15e0adfedc85aac5"
+}]

test/corpus/diff-summaries/template-string.json

@@ -0,0 +1,105 @@
+[{
+    "testCaseDescription": "javascript-template-string-insert-test",
+    "expectedResult": {
+        "changes": {
+            "template-string.js": [ "Added the '`one line`' template string" ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "template-string.js"
+    ],
+    "sha1": "e1be6714d1c7f731fec82d4a5f3ddcbd679bd231",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "01d9465e5591a489d8039350dc4a816baa76b02e"
+}
+,{
+    "testCaseDescription": "javascript-template-string-replacement-insert-test",
+    "expectedResult": {
+        "changes": {
+            "template-string.js": [ "Added the '`multi line`' template string","Added the '`one line`' template string" ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "template-string.js"
+    ],
+    "sha1": "01d9465e5591a489d8039350dc4a816baa76b02e",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "741b9434a201fe7efb9ca1c215020769322ff122"
+}
+,{
+    "testCaseDescription": "javascript-template-string-delete-insert-test",
+    "expectedResult": {
+        "changes": {
+            "template-string.js": [ "Added the '`one line`' template string","Deleted the '`multi line`' template string" ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "template-string.js"
+    ],
+    "sha1": "741b9434a201fe7efb9ca1c215020769322ff122",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "43dd5ba3b77caa88ae9bcb1cd5b7372e54176c65"
+}
+,{
+    "testCaseDescription": "javascript-template-string-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "template-string.js": [ "Added the '`mulit line`' template string","Deleted the '`one line`' template string" ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "template-string.js"
+    ],
+    "sha1": "43dd5ba3b77caa88ae9bcb1cd5b7372e54176c65",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "c685db7ae77b2b7c870c1278fdfee55b7afa2593"
+}
+,{
+    "testCaseDescription": "javascript-template-string-delete-replacement-test",
+    "expectedResult": {
+        "changes": {
+            "template-string.js": [ "Deleted the '`multi line`' template string","Added the '`multi line`' template string","Deleted the '`one line`' template string" ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "template-string.js"
+    ],
+    "sha1": "c685db7ae77b2b7c870c1278fdfee55b7afa2593",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "8da41cffe4b13838c58f6f8e1affdc4ef8235558"
+}
+,{
+    "testCaseDescription": "javascript-template-string-delete-test",
+    "expectedResult": {
+        "changes": {
+            "template-string.js": [ "Deleted the '`one line`' template string" ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "template-string.js"
+    ],
+    "sha1": "8da41cffe4b13838c58f6f8e1affdc4ef8235558",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "a27b0ea7b83d6c787a5bb24b1471364ada9fcc92"
+}
+,{
+    "testCaseDescription": "javascript-template-string-delete-rest-test",
+    "expectedResult": {
+        "changes": {
+            "template-string.js": [ "Deleted the '`multi line`' template string" ]
+        },
+        "errors": {}
+    },
+    "filePaths": [
+        "template-string.js"
+    ],
+    "sha1": "a27b0ea7b83d6c787a5bb24b1471364ada9fcc92",
+    "gitDir": "test/corpus/repos/javascript",
+    "sha2": "06b8c5b42b801f6855033fe4eafea2ee9fb2cef9"
+}]

test/corpus/generated/javascript.json

@@ -0,0 +1,422 @@
+[
+  {
+    "repoPath": "test/corpus/repos/javascript",
+    "repoUrl": "https://github.com/rewinfrey/javascript.git",
+    "language": "javascript",
+    "syntaxes": [
+      {
+        "syntax": "object",
+        "repoFilePath": "object.js",
+        "insert": "{ \"key1\": \"value1\" };",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/object.json",
+        "replacement": "{ \"key1\": \"value1\", \"key2\": \"value2\", \"key3\": \"3.0\" };"
+      },
+      {
+        "syntax": "anonymous-function",
+        "repoFilePath": "anonymous-function.js",
+        "insert": "function(a,b) { return a + b; }",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/anonymous-function.json",
+        "replacement": "function(b,c) { return b * c; }"
+      },
+      {
+        "syntax": "anonymous-parameterless-function",
+        "repoFilePath": "anonymous-parameterless-function.js",
+        "insert": "function() { return 'hi'; }",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/anonymous-parameterless-function.json",
+        "replacement": "function() { return 'hello'; }"
+      },
+      {
+        "syntax": "objects-with-methods",
+        "repoFilePath": "objects-with-methods.js",
+        "insert": "{ add(a, b) { return a + b; } };",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/object-with-methods.json",
+        "replacement": "{ subtract(a, b) { return a - b; } };"
+      },
+      {
+        "syntax": "string",
+        "repoFilePath": "string.js",
+        "insert": "'A string with \"double\" quotes';",
+        "replacement": "'A different string with \"double\" quotes';",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/string.json"
+      },
+      {
+        "syntax": "number",
+        "repoFilePath": "number.js",
+        "insert": "101",
+        "replacement": "102",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/number.json"
+      },
+      {
+        "syntax": "variable",
+        "repoFilePath": "variable.js",
+        "insert": "theVar;",
+        "replacement": "theVar2",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/variable.json"
+      },
+      {
+        "syntax": "identifier",
+        "repoFilePath": "identifier.js",
+        "insert": "theVar;",
+        "replacement": "theVar2",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/identifier.json"
+      },
+      {
+        "syntax": "this-expression",
+        "repoFilePath": "this-expression.js",
+        "insert": "this;",
+        "replacement": "return this;",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/this-expression.json"
+      },
+      {
+        "syntax": "null",
+        "repoFilePath": "null.js",
+        "insert": "null;",
+        "replacement": "return null;",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/null.json"
+      },
+      {
+        "syntax": "undefined",
+        "repoFilePath": "undefined.js",
+        "insert": "undefined;",
+        "replacement": "return undefined;",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/undefined.json"
+      },
+      {
+        "syntax": "true",
+        "repoFilePath": "true.js",
+        "insert": "true;",
+        "replacement": "return true;",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/true.json"
+      },
+      {
+        "syntax": "false",
+        "repoFilePath": "false.js",
+        "insert": "false;",
+        "replacement": "return false;",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/false.json"
+      },
+      {
+        "syntax": "class",
+        "repoFilePath": "class.js",
+        "insert": "class Foo { static one(a) { return a; }; two(b) { return b; } three(c) { return c; } }",
+        "replacement": "class Foo { static foo(a) { return a; }; bar(b) { return b; } baz(c) { return c; } }",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/class.json"
+      },
+      {
+        "syntax": "array",
+        "repoFilePath": "array.js",
+        "insert": "[ \"item1\" ];",
+        "replacement": "[ \"item1\", \"item2\" ];",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/array.json"
+      },
+      {
+        "syntax": "function",
+        "repoFilePath": "function.js",
+        "insert": "function(arg1, arg2) { arg2; };",
+        "replacement": "function(arg1, arg2) { arg1; };",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/function.json"
+      },
+      {
+        "syntax": "arrow-function",
+        "repoFilePath": "arrow-function.js",
+        "insert": "(f, g) => { return h; };",
+        "replacement": "(f, g) => { return g; };",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/arrow-function.json"
+      },
+      {
+        "syntax": "generator-function",
+        "repoFilePath": "generator-function.js",
+        "insert": "function *generateStuff(arg1, arg2) { yield; yield arg2; };",
+        "replacement": "function *generateNewStuff(arg1, arg2) { yield; yield arg2; };",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/generator-function.json"
+      },
+      {
+        "syntax": "named-function",
+        "repoFilePath": "named-function.js",
+        "insert": "function myFunction(arg1, arg2) { arg2; };",
+        "replacement": "function anotherFunction() { return false; };",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/named-function.json"
+      },
+      {
+        "syntax": "member-access",
+        "repoFilePath": "member-access.js",
+        "insert": "x.someProperty;",
+        "replacement": "x.someOtherProperty",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/member-access.json"
+      },
+      {
+        "syntax": "subscript-access-variable",
+        "repoFilePath": "subscript-access-variable.js",
+        "insert": "x[someVariable];",
+        "replacement": "x[someOtherVariable];",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/subscript-access-variable.json"
+      },
+      {
+        "syntax": "subscript-access-string",
+        "repoFilePath": "subscript-access-string.js",
+        "insert": "x[\"some-string\"];",
+        "replacement": "x[\"some-other-string\"];",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/subscript-access-string.json"
+      },
+      {
+        "syntax": "chained-property-access",
+        "repoFilePath": "chained-property-access.js",
+        "insert": "return returned.promise().done( newDefer.resolve ).fail( newDefer.reject )",
+        "replacement": "return returned.promise().done( otherDefer.resolve ).fail( otherDefer.reject )",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/chained-property-access.json"
+      },
+      {
+        "syntax": "chained-callbacks",
+        "repoFilePath": "chained-callbacks.js",
+        "insert": "this.map(function (a) { return a.b; })",
+        "replacement": "this.reduce(function (a) { return b.a; })",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/chained-callbacks.json"
+      },
+      {
+        "syntax": "function-call",
+        "repoFilePath": "function-call.js",
+        "insert": "someFunction(arg1, \"arg2\");",
+        "replacement": "someFunction(arg1, \"arg3\");",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/function-call.json"
+      },
+      {
+        "syntax": "method-call",
+        "repoFilePath": "method-call.js",
+        "insert": "object.someMethod(arg1, \"arg2\");",
+        "replacement": "object.someMethod(arg1, \"arg3\");",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/method-call.json"
+      },
+      {
+        "syntax": "function-call-args",
+        "repoFilePath": "function-call-args.js",
+        "insert": "someFunction(1, \"string\", function(a,b) { console.log(a); return b; }, true)",
+        "replacement": "someFunction(1, \"otherString\", function(b,c) { console.log(b); return c; }, false)",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/function-call-args.json"
+      },
+      {
+        "syntax": "constructor-call",
+        "repoFilePath": "constructor-call.js",
+        "insert": "new module.Klass(1, \"two\");",
+        "replacement": "new module.Klass(1, \"three\");",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/constructor-call.json"
+      },
+      {
+        "syntax": "math-operator",
+        "repoFilePath": "math-operator.js",
+        "insert": "i + j * 3 - j % 5;",
+        "replacement": "i + j * 2 - j % 4;",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/math-operator.json"
+      },
+      {
+        "syntax": "boolean-operator",
+        "repoFilePath": "boolean-operator.js",
+        "insert": "i || j;",
+        "replacement": "i && j;",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/boolean-operator.json"
+      },
+      {
+        "syntax": "bitwise-operator",
+        "repoFilePath": "bitwise-operator.js",
+        "insert": "i >> j;",
+        "replacement": "i >> k;",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/bitwise-operator.json"
+      },
+      {
+        "syntax": "relational-operator",
+        "repoFilePath": "relational-operator.js",
+        "insert": "x < y;",
+        "replacement": "x <= y;",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/relational-operator.json"
+      },
+      {
+        "syntax": "for-statement",
+        "repoFilePath": "for-statement.js",
+        "insert": "for (i = 0, init(); i < 10; i++) { log(i); }",
+        "replacement": "for (i = 0, init(); i < 100; i++) { log(i); }",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/for-statement.json"
+      },
+      {
+        "syntax": "assignment",
+        "repoFilePath": "assignment.js",
+        "insert": "x = 0;",
+        "replacement": "x = 1;",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/assignment.json"
+      },
+      {
+        "syntax": "member-access-assignment",
+        "repoFilePath": "member-access-assignment.js",
+        "insert": "y.x = 0;",
+        "replacement": "y.x = 1;",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/member-access-assignment.json"
+      },
+      {
+        "syntax": "subscript-access-assignment",
+        "repoFilePath": "subscript-access-assignment.js",
+        "insert": "y[\"x\"] = 0;",
+        "replacement": "y[\"x\"] = 1;",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/subscript-access-assignment.json"
+      },
+      {
+        "syntax": "comma-operator",
+        "repoFilePath": "comma-operator.js",
+        "insert": "a = 1, b = 2;",
+        "replacement": "c = {d: (3, 4 + 5, 6)};",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/comma-operator.json"
+      },
+      {
+        "syntax": "ternary",
+        "repoFilePath": "ternary.js",
+        "insert": "condition ? case1 : case2;",
+        "replacement": "x.y = some.condition ? some.case : some.other.case;",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/ternary.json"
+      },
+      {
+        "syntax": "type-operator",
+        "repoFilePath": "type-operator.js",
+        "insert": "typeof x;",
+        "replacement": "x instanceof String;",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/type-operator.json"
+      },
+      {
+        "syntax": "delete-operator",
+        "repoFilePath": "delete-operator.js",
+        "insert": "delete thing['prop'];",
+        "replacement": "delete thing.prop",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/delete-operator.json"
+      },
+      {
+        "syntax": "void-operator",
+        "repoFilePath": "void-operator.js",
+        "insert": "void b()",
+        "replacement": "void c()",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/void-operator.json"
+      },
+      {
+        "syntax": "math-assignment-operator",
+        "repoFilePath": "math-assignment-operator.js",
+        "insert": "x += 1;",
+        "replacement": "x += 2;",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/math-assignment-operator.json"
+      },
+      {
+        "syntax": "for-loop-with-in-statement",
+        "repoFilePath": "for-loop-with-in-statement.js",
+        "insert": "for (key in something && i = 0; i < n; i++) { doSomething(); }",
+        "replacement": "for (otherKey in something && i = 0; i < n; i++) { doOtherSomething(); }",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/for-loop-with-in-statement.json"
+      },
+      {
+        "syntax": "for-of-statement",
+        "repoFilePath": "for-of-statement.js",
+        "insert": "for (let item of items) { process(item); };",
+        "replacement": "for (let thing of things) { process(thing); };",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/for-of-statement.json"
+      },
+      {
+        "syntax": "while-statement",
+        "repoFilePath": "while-statement.js",
+        "insert": "while (a) { b(); };",
+        "replacement": "while (b) { a(); };",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/while-statement.json"
+      },
+      {
+        "syntax": "do-while-statement",
+        "repoFilePath": "do-while-statement.js",
+        "insert": "do { console.log(insert); } while (true);",
+        "replacement": "do { console.log(replacement); } while (false);",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/do-while-statement.json"
+      },
+      {
+        "syntax": "return-statement",
+        "repoFilePath": "return-statement.js",
+        "insert": "return 5;",
+        "replacement": "return;",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/return-statement.json"
+      },
+      {
+        "syntax": "var-declaration",
+        "repoFilePath": "var-declaration.js",
+        "insert": "var x = 1;",
+        "replacement": "var x, y = {}, z;",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/var-declaration.json"
+      },
+      {
+        "syntax": "comment",
+        "repoFilePath": "comment.js",
+        "insert": "// This is a property",
+        "replacement": "/*\n * This is a method\n*/",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/comment.json"
+      },
+      {
+        "syntax": "switch-statement",
+        "repoFilePath": "switch-statement.js",
+        "insert": "switch (1) { case 1: 1; case 2: 1; case 3: 3; };",
+        "replacement": "switch (2) { case 1: 1; case 2: 2; case 3: 3; };",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/switch-statement.json"
+      },
+      {
+        "syntax": "throw-statement",
+        "repoFilePath": "throw-statement.js",
+        "insert": "throw new Error(\"uh oh\");",
+        "replacement": "throw new Error(\"oooooops\");",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/throw-statement.json"
+      },
+      {
+        "syntax": "try-statement",
+        "repoFilePath": "try-statement.js",
+        "insert": "try { f; } catch { g; } finally { h; };",
+        "replacement": "try { f; } catch { h; } finally { g; };",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/try-statement.json"
+      },
+      {
+        "syntax": "regex",
+        "repoFilePath": "regex.js",
+        "insert": "/one/g;",
+        "replacement": "/on[^/]afe/gim;",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/regex.json"
+      },
+      {
+        "syntax": "if",
+        "repoFilePath": "if.js",
+        "insert": "if (x) { log(y); }",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/if.json",
+        "replacement": "if (a.b) { log(c); d; }"
+      },
+      {
+        "syntax": "if-else",
+        "repoFilePath": "if-else.js",
+        "insert": "if (x) y; else if (a) b;",
+        "replacement": "if (a) { c; d; } else { e; }",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/if-else.json"
+      },
+      {
+        "syntax": "template-string",
+        "repoFilePath": "template-string.js",
+        "insert": "`one line`",
+        "replacement": "`multi line`",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/template-string.json"
+      },
+      {
+        "syntax": "for-in-statement",
+        "repoFilePath": "for-in-statement.js",
+        "insert": "for (thing in things) { thing(); }",
+        "replacement": "for (item in items) { item(); }",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/for-in-statement.json"
+      },
+      {
+        "syntax": "nested-functions",
+        "repoFilePath": "nested-functions.js",
+        "insert": "function parent (arg1, arg2) { function child (arg3, arg4) { console.log(arg3); console.log(arg4); } }",
+        "replacement": "function parent (arg1, arg2) { function child (arg3, arg4) { console.log(arg1); console.log(arg2); } }",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/nested-functions.json"
+      },
+      {
+        "syntax": "nested-do-while-in-function",
+        "repoFilePath": "nested-do-while-in-function.js",
+        "insert": "function f(arg1, arg2) { do { something(arg1); } while (arg2); }",
+        "replacement": "function f(arg1, arg2) { do { something(arg2); } while (arg1); }",
+        "testCaseFilePath": "test/corpus/diff-summaries/javascript/nested-do-while-in-function.json"
+      }
+    ]
+  }
+]

test/corpus/repos/javascript

@@ -0,0 +1 @@
+Subproject commit 14310ea870b177f2187e152498699c8cd1b039f3

vendor/tree-sitter-parsers

@@ -1 +1 @@
-Subproject commit 8348194cc52b4b9fd61e3988b9526b54ebfef920
+Subproject commit de7bfb99606c9b5151d9e877d43c73cd9d0a44e9