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If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +. diff --git a/Setup.lhs b/Setup.lhs new file mode 100644 --- /dev/null +++ b/Setup.lhs @@ -0,0 +1,3 @@ +#!/usr/bin/env runhaskell +> import Distribution.Simple +> main = defaultMain diff --git a/happy-arbitrary.cabal b/happy-arbitrary.cabal new file mode 100644 --- /dev/null +++ b/happy-arbitrary.cabal @@ -0,0 +1,61 @@ +name: happy-arbitrary +version: 0.0.1 +synopsis: Token list generator for arbitrary Happy grammars. +homepage: https://toktok.ltd/ +license: GPL-3 +license-file: LICENSE +author: Iphigenia Df +maintainer: Iphigenia Df +copyright: Copyright (c) 2024, Iphigenia Df +category: Data +stability: Experimental +cabal-version: >=1.10 +build-type: Simple +description: Generates token lists for a Happy grammar for testing parsers. + +source-repository head + type: git + location: https://github.com/TokTok/hs-happy-arbitrary + +library + default-language: Haskell2010 + hs-source-dirs: src + ghc-options: -Wall + build-tools: alex >=0, happy >=0 + exposed-modules: + Language.Happy.Arbitrary + Language.Happy.Ast + Language.Happy.Lexer + Language.Happy.Parser + Language.Happy.Tokens + + build-depends: + QuickCheck + , aeson + , array + , base <5 + , containers + , bytestring + , data-fix + , extra + , file-embed + , recursion-schemes + , text + , transformers-compat + +test-suite testsuite + type: exitcode-stdio-1.0 + default-language: Haskell2010 + hs-source-dirs: test + main-is: testsuite.hs + other-modules: Language.Happy.ArbitrarySpec + ghc-options: -Wall + build-tool-depends: hspec-discover:hspec-discover + build-depends: + base <5 + , bytestring + , groom + , hspec + , QuickCheck + , happy-arbitrary + , text diff --git a/src/Language/Happy/Arbitrary.hs b/src/Language/Happy/Arbitrary.hs new file mode 100644 --- /dev/null +++ b/src/Language/Happy/Arbitrary.hs @@ -0,0 +1,53 @@ +{-# OPTIONS_GHC -Wwarn #-} +{-# LANGUAGE OverloadedStrings #-} +{-# LANGUAGE Strict #-} +module Language.Happy.Arbitrary where + +import Control.Applicative ((<|>)) +import Control.Monad.Extra (concatMapM) +import Data.Fix (foldFix) +import Data.Map (Map) +import qualified Data.Map as Map +import Data.Maybe (fromJust) +import Data.Text (Text) +import qualified Data.Text as Text +import Language.Happy.Ast (Node, NodeF (..)) +import Language.Happy.Lexer (Lexeme, lexemeText) +import qualified Test.QuickCheck.Gen as Gen +import Test.QuickCheck.Gen (Gen) + +genTokens :: Text -> Node (Lexeme Text) -> Gen [Text] +genTokens start g = do + case Map.lookup start rules of + Nothing -> error $ "no such rule: " <> Text.unpack start + Just r -> expand tokens rules r + where + tokens = foldFix terminals g + rules = foldFix nonterminals g + +expand :: Map Text Text -> Map Text [[Text]] -> [[Text]] -> Gen [Text] +expand tokens rules r = do + rule <- Gen.elements r + let expanded = map (resolve tokens rules) rule + concatMapM (continue tokens rules) expanded + +continue :: Map Text Text -> Map Text [[Text]] -> Either Text [[Text]] -> Gen [Text] +continue _ _ (Left token) = return [token] +continue tokens rules (Right rule) = expand tokens rules rule + +resolve :: Map Text Text -> Map Text [[Text]] -> Text -> Either Text [[Text]] +resolve tokens rules sym = + fromJust $ (Left <$> Map.lookup sym tokens) <|> (Right <$> Map.lookup sym rules) + +terminals :: NodeF (Lexeme Text) (Map Text Text) -> Map Text Text +terminals node = case node of + Token k v -> Map.singleton (lexemeText k) (lexemeText v) + n -> Map.unions n + +nonterminals :: NodeF (Lexeme Text) (Map Text [[Text]]) -> Map Text [[Text]] +nonterminals node = case node of + RuleLine syms _ -> Map.singleton "" [map lexemeText syms] + RuleDefn name rules -> Map.singleton (lexemeText name) (merge rules) + n -> Map.unionsWith (++) n + where + merge = concat . concatMap Map.elems diff --git a/src/Language/Happy/Ast.hs b/src/Language/Happy/Ast.hs new file mode 100644 --- /dev/null +++ b/src/Language/Happy/Ast.hs @@ -0,0 +1,40 @@ +{-# LANGUAGE DeriveGeneric #-} +{-# LANGUAGE DeriveTraversable #-} +{-# LANGUAGE DerivingVia #-} +{-# LANGUAGE FlexibleInstances #-} +{-# LANGUAGE Strict #-} +module Language.Happy.Ast + ( Node, NodeF (..) + ) where + +import Data.Aeson (FromJSON, FromJSON1, ToJSON, + ToJSON1) +import Data.Fix (Fix) +import Data.Functor.Classes (Eq1, Ord1, Read1, Show1) +import Data.Functor.Classes.Generic (FunctorClassesDefault (..)) +import GHC.Generics (Generic, Generic1) + +data NodeF lexeme a + = Grammar [lexeme] [a] [a] [lexeme] + | PragmaExpect lexeme + | PragmaName lexeme lexeme + | PragmaErrorHandlerType lexeme + | PragmaError lexeme + | PragmaLexer lexeme lexeme + | PragmaMonad lexeme + | PragmaTokenType lexeme + | PragmaToken [a] + | PragmaLeft [lexeme] + | PragmaRight [lexeme] + | Token lexeme lexeme + | Rule a a + | RuleType lexeme lexeme + | RuleDefn lexeme [a] + | RuleLine [lexeme] lexeme + deriving (Show, Read, Eq, Ord, Generic, Generic1, Functor, Foldable, Traversable) + deriving (Show1, Read1, Eq1, Ord1) via FunctorClassesDefault (NodeF lexeme) + +type Node lexeme = Fix (NodeF lexeme) + +instance FromJSON lexeme => FromJSON1 (NodeF lexeme) +instance ToJSON lexeme => ToJSON1 (NodeF lexeme) diff --git a/src/Language/Happy/Lexer.x b/src/Language/Happy/Lexer.x new file mode 100644 --- /dev/null +++ b/src/Language/Happy/Lexer.x @@ -0,0 +1,113 @@ +{ +{-# LANGUAGE DeriveFunctor #-} +{-# LANGUAGE DeriveGeneric #-} +{-# LANGUAGE DeriveTraversable #-} +{-# LANGUAGE StandaloneDeriving #-} +{-# LANGUAGE StrictData #-} +{-# OPTIONS_GHC -Wno-unused-imports #-} +module Language.Happy.Lexer + ( Alex + , AlexPosn (..) + , alexError + , alexScanTokens + , alexMonadScan + , Lexeme (..) + , lexemeClass + , lexemePosn + , lexemeText + , lexemeLine + , runAlex + ) where + +import Data.Aeson (FromJSON, ToJSON) +import qualified Data.ByteString as BS +import qualified Data.ByteString.Lazy as LBS +import Data.Text (Text) +import qualified Data.Text as Text +import qualified Data.Text.Encoding as Text +import GHC.Generics (Generic) +import Language.Happy.Tokens (LexemeClass (..)) +} + +%wrapper "monad-bytestring" + +tokens :- +<0> "{" { begin hs } + + [^\{\}]+ { mkL LitCode } + "}" { begin 0 } + "{-" { begin hsCmt } + "-}" { begin hs } + (.|\n) ; + +<0> "%errorhandlertype" { mkL KwErrorhandlertype } +<0> "%error" { mkL KwError } +<0> "%expect" { mkL KwExpect } +<0> "%left" { mkL KwLeft } +<0> "%lexer" { mkL KwLexer } +<0> "%monad" { mkL KwMonad } +<0> "%name" { mkL KwName } +<0> "%right" { mkL KwRight } +<0> "%token" { mkL KwToken } +<0> "%tokentype" { mkL KwTokentype } + +<0> "%%" { mkL PctPercentPercent } +<0> "::" { mkL PctColonColon } +<0> ":" { mkL PctColon } +<0> "|" { mkL PctPipe } + +<0> "--"\n ; +<0> "-- ".* ; +<0> [\ \t\n]+ ; +<0> $white { mkE ErrorToken } +<0> '(\\|[^'])*' { mkL LitString } +<0> [A-Za-z][A-Za-z0-9_]* { mkL IdName } +<0> [0-9]+ { mkL LitInteger } + +-- Error handling. +<0> . { mkL ErrorToken } + +{ +deriving instance Generic AlexPosn +instance FromJSON AlexPosn +instance ToJSON AlexPosn + +data Lexeme text = L AlexPosn LexemeClass text + deriving (Eq, Show, Generic, Functor, Foldable, Traversable) + +instance FromJSON text => FromJSON (Lexeme text) +instance ToJSON text => ToJSON (Lexeme text) + +mkL :: LexemeClass -> AlexInput -> Int64 -> Alex (Lexeme Text) +mkL c (p, _, str, _) len = pure $ L p c (piece str) + where piece = Text.decodeUtf8 . LBS.toStrict . LBS.take len + +mkE :: LexemeClass -> AlexInput -> Int64 -> Alex (Lexeme Text) +mkE c (p, _, str, _) len = alexError $ ": " <> show (L p c (piece str)) + where piece = Text.decodeUtf8 . LBS.toStrict . LBS.take len + +lexemePosn :: Lexeme text -> AlexPosn +lexemePosn (L p _ _) = p + +lexemeClass :: Lexeme text -> LexemeClass +lexemeClass (L _ c _) = c + +lexemeText :: Lexeme text -> text +lexemeText (L _ _ s) = s + +lexemeLine :: Lexeme text -> Int +lexemeLine (L (AlexPn _ l _) _ _) = l + +alexEOF :: Alex (Lexeme Text) +alexEOF = return (L (AlexPn 0 0 0) Eof Text.empty) + +alexScanTokens :: LBS.ByteString -> Either String [Lexeme Text] +alexScanTokens str = + runAlex str $ loop [] + where + loop toks = do + tok@(L _ cl _) <- alexMonadScan + if cl == Eof + then return $ reverse toks + else loop $! (tok:toks) +} diff --git a/src/Language/Happy/Parser.y b/src/Language/Happy/Parser.y new file mode 100644 --- /dev/null +++ b/src/Language/Happy/Parser.y @@ -0,0 +1,147 @@ +{ +{-# LANGUAGE CPP #-} +{-# LANGUAGE OverloadedStrings #-} +{-# LANGUAGE TemplateHaskell #-} +module Language.Happy.Parser + ( parseGrammar + , source + ) where + +import qualified Data.ByteString as BS +import Data.FileEmbed (embedFile) +import Data.Fix (Fix (..)) +import Data.Text (Text) +import qualified Data.Text as Text +import Language.Happy.Ast (Node, NodeF (..)) +import Language.Happy.Lexer (Alex, AlexPosn (..), Lexeme (..), + alexError, alexMonadScan) +import Language.Happy.Tokens (LexemeClass (..)) +} + +%expect 0 + +%name parseGrammar Grammar + +%error {parseError} +%errorhandlertype explist +%lexer {lexwrap} {L _ Eof _} +%monad {Alex} +%tokentype {Term} +%token + ID_NAME { L _ IdName _ } + + '{}' { L _ LitCode _ } + + '%errorhandlertype' { L _ KwErrorhandlertype _ } + '%error' { L _ KwError _ } + '%expect' { L _ KwExpect _ } + '%left' { L _ KwLeft _ } + '%lexer' { L _ KwLexer _ } + '%monad' { L _ KwMonad _ } + '%name' { L _ KwName _ } + '%right' { L _ KwRight _ } + '%token' { L _ KwToken _ } + '%tokentype' { L _ KwTokentype _ } + + '%%' { L _ PctPercentPercent _ } + '::' { L _ PctColonColon _ } + ':' { L _ PctColon _ } + '|' { L _ PctPipe _ } + + LIT_STRING { L _ LitString _ } + LIT_INTEGER { L _ LitInteger _ } + +%% + +Grammar :: { NonTerm } +Grammar +: Code Pragmas '%%' Rules Code { Fix $ Grammar $1 $2 $4 $5 } + +Code :: { [Term] } +Code +: '{}' { [$1] } +| Code '{}' { $1 ++ [$2] } + +Pragmas :: { [NonTerm] } +Pragmas +: Pragma { [$1] } +| Pragmas Pragma { $1 ++ [$2] } + +Pragma :: { NonTerm } +Pragma +: '%expect' LIT_INTEGER { Fix $ PragmaExpect $2 } +| '%name' ID_NAME ID_NAME { Fix $ PragmaName $2 $3 } +| '%errorhandlertype' ID_NAME { Fix $ PragmaErrorHandlerType $2 } +| '%error' '{}' { Fix $ PragmaError $2 } +| '%lexer' '{}' '{}' { Fix $ PragmaLexer $2 $3 } +| '%monad' '{}' { Fix $ PragmaMonad $2 } +| '%tokentype' '{}' { Fix $ PragmaTokenType $2 } +| '%token' Tokens { Fix $ PragmaToken $2 } +| '%left' TokenNames { Fix $ PragmaLeft $2 } +| '%right' TokenNames { Fix $ PragmaRight $2 } + +TokenNames :: { [Term] } +TokenNames +: TokenName { [$1] } +| TokenNames TokenName { $1 ++ [$2] } + +Tokens :: { [NonTerm] } +Tokens +: Token { [$1] } +| Tokens Token { $1 ++ [$2] } + +Token :: { NonTerm } +Token +: TokenName '{}' { Fix $ Token $1 $2 } + +TokenName :: { Term } +TokenName +: LIT_STRING { $1 } +| ID_NAME { $1 } + +Rules :: { [NonTerm] } +Rules +: Rule { [$1] } +| Rules Rule { $1 ++ [$2] } + +Rule :: { NonTerm } +Rule +: RuleType RuleDefn { Fix $ Rule $1 $2 } + +RuleType :: { NonTerm } +RuleType +: ID_NAME '::' '{}' { Fix $ RuleType $1 $3 } + +RuleDefn :: { NonTerm } +RuleDefn +: ID_NAME ':' RuleLines { Fix $ RuleDefn $1 $3 } + +RuleLines :: { [NonTerm] } +RuleLines +: RuleLine { [$1] } +| RuleLines '|' RuleLine { $1 ++ [$3] } + +RuleLine :: { NonTerm } +RuleLine +: TokenNames '{}' { Fix $ RuleLine $1 $2 } + + +{ +type Term = Lexeme Text +type NonTerm = Node Term + +parseError :: Show text => (Lexeme text, [String]) -> Alex a +parseError (L (AlexPn _ line col) c t, options) = + alexError $ ":" <> show line <> ":" <> show col <> ": Parse error near " <> show c <> ": " + <> show t <> "; expected one of " <> show options + +lexwrap :: (Lexeme Text -> Alex a) -> Alex a +lexwrap = (alexMonadScan >>=) + +source :: BS.ByteString +#ifdef SOURCE +source = $(embedFile SOURCE) +#else +source = BS.empty +#endif +} diff --git a/src/Language/Happy/Tokens.hs b/src/Language/Happy/Tokens.hs new file mode 100644 --- /dev/null +++ b/src/Language/Happy/Tokens.hs @@ -0,0 +1,38 @@ +{-# LANGUAGE DeriveGeneric #-} +{-# LANGUAGE StrictData #-} +module Language.Happy.Tokens + ( LexemeClass (..) + ) where + +import Data.Aeson (FromJSON, ToJSON) +import GHC.Generics (Generic) + +data LexemeClass + = IdName + + | KwErrorhandlertype + | KwError + | KwExpect + | KwLeft + | KwLexer + | KwMonad + | KwName + | KwRight + | KwToken + | KwTokentype + + | PctColon + | PctColonColon + | PctPercentPercent + | PctPipe + + | LitCode + | LitInteger + | LitString + + | ErrorToken + | Eof + deriving (Enum, Bounded, Ord, Eq, Show, Read, Generic) + +instance FromJSON LexemeClass +instance ToJSON LexemeClass diff --git a/test/Language/Happy/ArbitrarySpec.hs b/test/Language/Happy/ArbitrarySpec.hs new file mode 100644 --- /dev/null +++ b/test/Language/Happy/ArbitrarySpec.hs @@ -0,0 +1,66 @@ +{-# LANGUAGE OverloadedStrings #-} +{-# LANGUAGE Strict #-} +module Language.Happy.ArbitrarySpec where + +import qualified Data.ByteString as BS +import qualified Data.ByteString.Lazy as LBS +import Data.Text (Text) +import qualified Data.Text as Text +import qualified Data.Text.Encoding as Text +import Language.Happy.Arbitrary (genTokens) +import Language.Happy.Ast (Node) +import Language.Happy.Lexer (Lexeme, runAlex) +import Language.Happy.Parser (parseGrammar) +import qualified Language.Happy.Parser as Parser +import Language.Happy.Tokens (LexemeClass (..)) +import Test.Hspec (Spec, describe, expectationFailure, + it) +import Test.QuickCheck (forAll) + + +sampleToken :: LexemeClass -> Text +sampleToken c = case c of + IdName -> "name" + + KwErrorhandlertype -> "%errorhandlertype" + KwError -> "%error" + KwExpect -> "%expect" + KwLeft -> "%left" + KwLexer -> "%lexer" + KwMonad -> "%monad" + KwName -> "%name" + KwRight -> "%right" + KwToken -> "%token" + KwTokentype -> "%tokentype" + + PctColon -> ":" + PctColonColon -> "::" + PctPercentPercent -> "%%" + PctPipe -> "|" + + LitCode -> "{ code }" + LitInteger -> "0" + LitString -> "'token'" + + -- These should never be generated by genTokens. + ErrorToken -> "!!!ERROR!!!" + Eof -> "!!!EOF!!!" + +parseToken :: Text -> LexemeClass +parseToken = read . Text.unpack . (!! 2) . concatMap (filter (not . Text.null) . Text.splitOn "\t") . Text.splitOn " " + +tryParseGrammar :: Monad m => (Node (Lexeme Text) -> m ()) -> m () +tryParseGrammar _ | BS.null Parser.source = return () +tryParseGrammar f = + case runAlex (LBS.fromStrict Parser.source) parseGrammar of + Left err -> error err + Right ok -> f ok + +spec :: Spec +spec = tryParseGrammar $ \g -> do + describe "genTokens" $ do + it "generates sequences that can be parsed again using the same grammar" $ + forAll (Text.intercalate " " . map (sampleToken . parseToken) <$> genTokens "Grammar" g) $ \code -> do + case runAlex (LBS.fromStrict . Text.encodeUtf8 $ code) parseGrammar of + Left err -> expectationFailure err + Right ok -> print ok diff --git a/test/testsuite.hs b/test/testsuite.hs new file mode 100644 --- /dev/null +++ b/test/testsuite.hs @@ -0,0 +1,1 @@ +{-# OPTIONS_GHC -F -pgmF hspec-discover #-}