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227 lines
8.4 KiB
Haskell
227 lines
8.4 KiB
Haskell
{-# LANGUAGE DataKinds #-}
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module Data.Syntax.Assignment.Spec where
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import Data.ByteString.Char8 as B (words, length)
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import Data.Source
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import Data.Syntax.Assignment
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import Info
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import Prologue hiding (State)
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import Test.Hspec
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import Text.Parser.TreeSitter.Language (Symbol(..), SymbolType(..))
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spec :: Spec
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spec = do
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describe "Applicative" $
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it "matches in sequence" $
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fst <$> runAssignment headF "helloworld" ((,) <$> red <*> red) (makeState [node Red 0 5 [], node Red 5 10 []])
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`shouldBe`
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Right (Out "hello", Out "world")
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describe "Alternative" $ do
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it "attempts multiple alternatives" $
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fst <$> runAssignment headF "hello" (green <|> red) (makeState [node Red 0 5 []])
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`shouldBe`
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Right (Out "hello")
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it "matches repetitions" $
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let s = "colourless green ideas sleep furiously"
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w = words s
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(_, nodes) = foldl (\ (i, prev) word -> (i + B.length word + 1, prev <> [node Red i (i + B.length word) []])) (0, []) w in
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fst <$> runAssignment headF (fromBytes s) (many red) (makeState nodes)
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`shouldBe`
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Right (Out <$> w)
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it "matches one-or-more repetitions against one or more input nodes" $
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fst <$> runAssignment headF "hello" (some red) (makeState [node Red 0 5 []])
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`shouldBe`
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Right [Out "hello"]
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it "distributes through overlapping committed choices, matching the left alternative" $
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fst <$> runAssignment headF "(red (green))" (symbol Red *> children green <|> symbol Red *> children blue) (makeState [node Red 0 13 [node Green 5 12 []]])
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`shouldBe`
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Right (Out "(green)")
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describe "symbol" $ do
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it "matches nodes with the same symbol" $
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fst <$> runAssignment headF "hello" red (makeState [node Red 0 5 []]) `shouldBe` Right (Out "hello")
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it "does not advance past the current node" $
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runAssignment headF "hi" (symbol Red) (makeState [ node Red 0 2 [] ]) `shouldBe` Left (Error (Info.Pos 1 1) [] (Just Red))
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describe "without catchError" $ do
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it "assignment returns unexpected symbol error" $
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runAssignment headF "A"
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red
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(makeState [node Green 0 1 []])
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`shouldBe`
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Left (Error (Info.Pos 1 1) [Red] (Just Green))
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it "assignment returns unexpected end of input" $
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runAssignment headF "A"
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(symbol Green *> children (some red))
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(makeState [node Green 0 1 []])
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`shouldBe`
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Left (Error (Info.Pos 1 1) [Red] Nothing)
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describe "catchError" $ do
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it "handler that always matches" $
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fst <$> runAssignment headF "A"
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(red `catchError` (\ _ -> OutError <$ location <*> source))
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(makeState [node Green 0 1 []])
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`shouldBe`
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Right (OutError "A")
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it "handler that matches" $
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fst <$> runAssignment headF "A"
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(red `catchError` const green)
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(makeState [node Green 0 1 []])
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`shouldBe`
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Right (Out "A")
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it "handler that doesn't match produces error" $
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runAssignment headF "A"
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(red `catchError` const blue)
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(makeState [node Green 0 1 []])
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`shouldBe`
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Left (Error (Info.Pos 1 1) [Blue] (Just Green))
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describe "in many" $ do
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it "handler that always matches" $
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fst <$> runAssignment headF "PG"
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(symbol Palette *> children (
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many (red `catchError` (\ _ -> OutError <$ location <*> source))
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))
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(makeState [node Palette 0 1 [node Green 1 2 []]])
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`shouldBe`
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Right [OutError "G"]
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it "handler that matches" $
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fst <$> runAssignment headF "PG"
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(symbol Palette *> children ( many (red `catchError` const green) ))
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(makeState [node Palette 0 1 [node Green 1 2 []]])
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`shouldBe`
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Right [Out "G"]
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it "handler that doesn't match produces error" $
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runAssignment headF "PG"
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(symbol Palette *> children ( many (red `catchError` const blue) ))
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(makeState [node Palette 0 1 [node Green 1 2 []]])
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`shouldBe`
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Left (Error (Info.Pos 1 2) [Blue] (Just Green))
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it "handler that always matches with apply consumes and then errors" $
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runAssignment headF "PG"
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(symbol Palette *> children (
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(,) <$> many (red `catchError` (\ _ -> OutError <$ location <*> source)) <*> green
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))
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(makeState [node Palette 0 1 [node Green 1 2 []]])
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`shouldBe`
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Left (Error (Info.Pos 1 3) [Green] Nothing)
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it "handler that doesn't match with apply" $
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fst <$> runAssignment headF "PG"
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(symbol Palette *> children (
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(,) <$> many (red `catchError` const blue) <*> green
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))
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(makeState [node Palette 0 1 [node Green 1 2 []]])
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`shouldBe`
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Right ([], Out "G")
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describe "many" $ do
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it "takes ones and only one zero width repetition" $
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fst <$> runAssignment headF "PGG"
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(symbol Palette *> children ( many (green <|> pure (Out "always")) ))
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(makeState [node Palette 0 1 [node Green 1 2 [], node Green 2 3 []]])
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`shouldBe`
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Right [Out "G", Out "G", Out "always"]
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describe "source" $ do
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it "produces the node’s source" $
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assignBy headF "hi" source (node Red 0 2 []) `shouldBe` Right "hi"
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it "advances past the current node" $
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snd <$> runAssignment headF "hi" source (makeState [ node Red 0 2 [] ])
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`shouldBe`
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Right (State 2 (Info.Pos 1 3) Nothing 1 [])
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describe "children" $ do
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it "advances past the current node" $
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snd <$> runAssignment headF "a" (children (pure (Out ""))) (makeState [node Red 0 1 []])
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`shouldBe`
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Right (State 1 (Info.Pos 1 2) Nothing 1 [])
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it "matches if its subrule matches" $
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() <$ runAssignment headF "a" (children red) (makeState [node Blue 0 1 [node Red 0 1 []]])
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`shouldBe`
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Right ()
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it "does not match if its subrule does not match" $
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runAssignment headF "a" (children red) (makeState [node Blue 0 1 [node Green 0 1 []]])
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`shouldBe`
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Left (Error (Info.Pos 1 1) [Red] (Just Green))
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it "matches nested children" $
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fst <$> runAssignment headF "1"
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(symbol Red *> children (symbol Green *> children (symbol Blue *> source)))
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(makeState [ node Red 0 1 [ node Green 0 1 [ node Blue 0 1 [] ] ] ])
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`shouldBe`
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Right "1"
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it "continues after children" $
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fst <$> runAssignment headF "BC"
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(many (symbol Red *> children (symbol Green *> source)
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<|> symbol Blue *> source))
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(makeState [ node Red 0 1 [ node Green 0 1 [] ]
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, node Blue 1 2 [] ])
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`shouldBe`
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Right ["B", "C"]
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it "matches multiple nested children" $
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fst <$> runAssignment headF "12"
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(symbol Red *> children (many (symbol Green *> children (symbol Blue *> source))))
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(makeState [ node Red 0 2 [ node Green 0 1 [ node Blue 0 1 [] ]
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, node Green 1 2 [ node Blue 1 2 [] ] ] ])
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`shouldBe`
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Right ["1", "2"]
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describe "runAssignment" $ do
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it "drops anonymous nodes before matching symbols" $
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fst <$> runAssignment headF "magenta red" red (makeState [node Magenta 0 7 [], node Red 8 11 []])
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`shouldBe`
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Right (Out "red")
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it "does not drop anonymous nodes after matching" $
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stateNodes . snd <$> runAssignment headF "red magenta" red (makeState [node Red 0 3 [], node Magenta 4 11 []])
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`shouldBe`
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Right [node Magenta 4 11 []]
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it "does not drop anonymous nodes when requested" $
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fst <$> runAssignment headF "magenta red" ((,) <$> magenta <*> red) (makeState [node Magenta 0 7 [], node Red 8 11 []])
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`shouldBe`
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Right (Out "magenta", Out "red")
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node :: symbol -> Int -> Int -> [AST symbol] -> AST symbol
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node symbol start end children = cofree $ Node symbol (Range start end) (Info.Span (Info.Pos 1 (succ start)) (Info.Pos 1 (succ end))) :< children
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data Grammar = Palette | Red | Green | Blue | Magenta
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deriving (Enum, Eq, Show)
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instance Symbol Grammar where
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symbolType Magenta = Anonymous
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symbolType _ = Regular
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data Out = Out ByteString | OutError ByteString
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deriving (Eq, Show)
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red :: Assignment (AST Grammar) Grammar Out
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red = Out <$ symbol Red <*> source
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green :: Assignment (AST Grammar) Grammar Out
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green = Out <$ symbol Green <*> source
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blue :: Assignment (AST Grammar) Grammar Out
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blue = Out <$ symbol Blue <*> source
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magenta :: Assignment (AST Grammar) Grammar Out
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magenta = Out <$ symbol Magenta <*> source
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