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semantic/test/Data/Syntax/Assignment/Spec.hs

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module Data.Syntax.Assignment.Spec where
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import Data.ByteString.Char8 (words)
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import Data.Syntax.Assignment
import Prologue
import Test.Hspec
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import Text.Parser.TreeSitter.Language (Symbol(..), SymbolType(..))
spec :: Spec
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spec = do
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describe "Applicative" $ do
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it "matches in sequence" $
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runAssignment ((,) <$> red <*> red) [ast Red "hello" [], ast Red "world" []] `shouldBe` Result ([], (Out "hello", Out "world"))
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describe "Alternative" $ do
it "attempts multiple alternatives" $
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runAssignment (green <|> red) [ast Red "hello" []] `shouldBe` Result ([], Out "hello")
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it "matches repetitions" $
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let w = words "colourless green ideas sleep furiously" in
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runAssignment (many red) (flip (ast Red) [] <$> w) `shouldBe` Result ([], Out <$> w)
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it "matches one-or-more repetitions against one or more input nodes" $
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runAssignment (some red) [ast Red "hello" []] `shouldBe` Result ([], [Out "hello"])
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describe "symbol" $ do
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it "matches nodes with the same symbol" $
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runAssignment red [ast Red "hello" []] `shouldBe` Result ([], Out "hello")
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it "does not advance past the current node" $
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fst <$> runAssignment (symbol Red) [ Rose (Node Red "hi") [] ] `shouldBe` Result [ Rose (Node Red "hi") [] ]
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describe "source" $ do
it "produces the nodes source" $
snd <$> runAssignment source [ Rose (Node Red "hi") [] ] `shouldBe` Result "hi"
it "advances past the current node" $
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fst <$> runAssignment source [ Rose (Node Red "hi") [] ] `shouldBe` Result []
describe "children" $ do
it "advances past the current node" $
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fst <$> runAssignment (children (pure (Out ""))) [ast Red "a" []] `shouldBe` Result []
it "matches if its subrule matches" $
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() <$ runAssignment (children red) [ast Blue "b" [ast Red "a" []]] `shouldBe` Result ()
it "does not match if its subrule does not match" $
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runAssignment (children red) [ast Blue "b" [ast Green "a" []]] `shouldBe` Error []
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it "matches nested children" $ do
runAssignment
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(symbol Red *> children (symbol Green *> children (symbol Blue *> source)))
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[ ast Red "" [ ast Green "" [ ast Blue "1" [] ] ] ]
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`shouldBe`
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Result ([], "1")
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it "continues after children" $ do
runAssignment
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(many (symbol Red *> children (symbol Green *> source)
<|> symbol Blue *> source))
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[ ast Red "" [ ast Green "B" [] ]
, ast Blue "C" [] ]
`shouldBe`
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Result ([], ["B", "C"])
it "matches multiple nested children" $ do
runAssignment
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(symbol Red *> children (many (symbol Green *> children (symbol Blue *> source))))
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[ ast Red "" [ ast Green "" [ ast Blue "1" [] ]
, ast Green "" [ ast Blue "2" [] ] ] ]
`shouldBe`
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Result ([], ["1", "2"])
ast :: grammar -> ByteString -> [AST grammar] -> AST grammar
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ast g s c = Rose (Node g s) c
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data Grammar = Red | Green | Blue
deriving (Eq, Show)
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instance Symbol Grammar where
symbolType _ = Regular
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data Out = Out ByteString
deriving (Eq, Show)
red :: Assignment Grammar Out
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red = Out <$ symbol Red <*> source
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green :: Assignment Grammar Out
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green = Out <$ symbol Green <*> source
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blue :: Assignment Grammar Out
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blue = Out <$ symbol Blue <*> source