happy-arbitrary (empty) → 0.0.1
raw patch · 10 files changed
+1196/−0 lines, 10 filesdep +QuickCheckdep +aesondep +arraysetup-changed
Dependencies added: QuickCheck, aeson, array, base, bytestring, containers, data-fix, extra, file-embed, groom, happy-arbitrary, hspec, recursion-schemes, text, transformers-compat
Files
- LICENSE +674/−0
- Setup.lhs +3/−0
- happy-arbitrary.cabal +61/−0
- src/Language/Happy/Arbitrary.hs +53/−0
- src/Language/Happy/Ast.hs +40/−0
- src/Language/Happy/Lexer.x +113/−0
- src/Language/Happy/Parser.y +147/−0
- src/Language/Happy/Tokens.hs +38/−0
- test/Language/Happy/ArbitrarySpec.hs +66/−0
- test/testsuite.hs +1/−0
+ LICENSE view
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+ Setup.lhs view
@@ -0,0 +1,3 @@+#!/usr/bin/env runhaskell+> import Distribution.Simple+> main = defaultMain
+ happy-arbitrary.cabal view
@@ -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 <iphydf@gmail.com>+maintainer: Iphigenia Df <iphydf@gmail.com>+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
+ src/Language/Happy/Arbitrary.hs view
@@ -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
+ src/Language/Happy/Ast.hs view
@@ -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)
+ src/Language/Happy/Lexer.x view
@@ -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 }++<hs> [^\{\}]+ { mkL LitCode }+<hs> "}" { begin 0 }+<hs> "{-" { begin hsCmt }+<hsCmt> "-}" { begin hs }+<hs,hsCmt> (.|\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)+}
+ src/Language/Happy/Parser.y view
@@ -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+}
+ src/Language/Happy/Tokens.hs view
@@ -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
+ test/Language/Happy/ArbitrarySpec.hs view
@@ -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
+ test/testsuite.hs view
@@ -0,0 +1,1 @@+{-# OPTIONS_GHC -F -pgmF hspec-discover #-}