megaparsec-utils (empty) → 0.1.0.0

raw patch · 7 files changed

+1199/−0 lines, 7 filesdep +QuickCheckdep +aesondep +base

Dependencies added: QuickCheck, aeson, base, hspec, megaparsec, megaparsec-utils, parser-combinators, text, uuid

Files

CHANGELOG.md +20/−0
LICENSE +674/−0
README.md +17/−0
megaparsec-utils.cabal +68/−0
src/Text/Megaparsec/Utils.hs +167/−0
test/Spec.hs +2/−0
test/Text/Megaparsec/UtilsSpec.hs +251/−0

+ CHANGELOG.md view

@@ -0,0 +1,20 @@+Changelog++# 1.0.0 (2025-07-28)+++### Bug Fixes++* fix date parser with day short names ([64f3229](https://github.com/drlkf/megaparsec-utils/commit/64f3229dcfd660bdd770938da0bbacbf84c02dc3))+* fix invalid generation of TimeOfDay ([6bc728e](https://github.com/drlkf/megaparsec-utils/commit/6bc728ea31e2cfb380927c53ee544f44b399ece7))+* fix type errors in boundedEnumShowParser ([9c0fe3d](https://github.com/drlkf/megaparsec-utils/commit/9c0fe3db132bfe123be2d71e7c92f5928113cc26))+++### Features++* add aeson parser transformer ([84857eb](https://github.com/drlkf/megaparsec-utils/commit/84857eb2d5221f8547e9130c2b8503e7e59888a4))+* add date parser ([357d03f](https://github.com/drlkf/megaparsec-utils/commit/357d03f265e053f128be8711aec53e0b7659e563))+* add duration parsers ([a89bd88](https://github.com/drlkf/megaparsec-utils/commit/a89bd885b867b65cb7db3fcad4635cd38cba2227))+* add gregorian day parser ([46d4178](https://github.com/drlkf/megaparsec-utils/commit/46d4178945ad8bff5b309b95d9a2901a53b60ef9))+* add parser for decimal numbers ([42de75f](https://github.com/drlkf/megaparsec-utils/commit/42de75fec47b29caf1de59334b7a9c5e05f87a2f))+* add time parsers ([f267ffd](https://github.com/drlkf/megaparsec-utils/commit/f267ffd718f701046965318f99aa73b7f9e7b335))

+ LICENSE view

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If not, see <https://www.gnu.org/licenses/>.++Also add information on how to contact you by electronic and paper mail.++  If the program does terminal interaction, make it output a short+notice like this when it starts in an interactive mode:++    <program>  Copyright (C) <year>  <name of author>+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.+    This is free software, and you are welcome to redistribute it+    under certain conditions; type `show c' for details.++The hypothetical commands `show w' and `show c' should show the appropriate+parts of the General Public License.  Of course, your program's commands+might be different; for a GUI interface, you would use an "about box".++  You should also get your employer (if you work as a programmer) or school,+if any, to sign a "copyright disclaimer" for the program, if necessary.+For more information on this, and how to apply and follow the GNU GPL, see+<https://www.gnu.org/licenses/>.++  The GNU General Public License does not permit incorporating your program+into proprietary programs.  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+<https://www.gnu.org/licenses/why-not-lgpl.html>.

+ README.md view

@@ -0,0 +1,17 @@+# megaparsec-utils+Utilities to use on top of the+[Megaparsec](https://hackage.haskell.org/package/megaparsec) library.++# Running tests+Make sure your build passes tests using [Stack](https://docs.haskellstack.org/en/stable/).++# Contributing+This repository uses [Conventional+Commits](https://www.conventionalcommits.org/en/v1.0.0/) to generate versions+with [Semantic Release](https://github.com/semantic-release/semantic-release),+so make sure your commits are compliant. Pull requests are rebased, not+squashed, so make sure your commits make sense as well.++It is preferrable that you format code using+[fourmolu](https://github.com/fourmolu/fourmolu), a configuration is available+at the root of the repository.

+ megaparsec-utils.cabal view

@@ -0,0 +1,68 @@+cabal-version: 1.12++-- This file has been generated from package.yaml by hpack version 0.37.0.+--+-- see: https://github.com/sol/hpack++name:           megaparsec-utils+version:        0.1.0.0+synopsis:       Parsers and utilities for the Megaparsec library.+description:    Common parsers and utilities to use with the Megaparsec library.+category:       Parsing+homepage:       https://github.com/drlkf/megaparsec-utils+bug-reports:    https://github.com/drlkf/megaparsec-utils/issues+author:         drlkf+maintainer:     drlkf@drlkf.net+copyright:      2024 drlkf+license:        GPL-3+license-file:   LICENSE+build-type:     Simple+tested-with:+    GHC == 9.8+  , GHC == 9.6+  , GHC == 9.4+extra-source-files:+    README.md+    CHANGELOG.md++source-repository head+  type: git+  location: https://github.com/drlkf/megaparsec-utils++library+  exposed-modules:+      Text.Megaparsec.Utils+  other-modules:+      Paths_megaparsec_utils+  hs-source-dirs:+      src+  ghc-options: -Wall -Wcompat -Widentities -Wincomplete-record-updates -Wincomplete-uni-patterns -Wmissing-export-lists -Wmissing-home-modules -Wpartial-fields -Wredundant-constraints+  build-depends:+      aeson >=2.0 && <3+    , base >=4.7 && <5+    , megaparsec >=9.0 && <10+    , parser-combinators >=1.0 && <2+    , text >=2.0 && <3+    , uuid >=1.3 && <2+  default-language: Haskell2010++test-suite megaparsec-utils-test+  type: exitcode-stdio-1.0+  main-is: Spec.hs+  other-modules:+      Text.Megaparsec.UtilsSpec+      Paths_megaparsec_utils+  hs-source-dirs:+      test+  ghc-options: -Wall -Wcompat -Widentities -Wincomplete-record-updates -Wincomplete-uni-patterns -Wmissing-export-lists -Wmissing-home-modules -Wpartial-fields -Wredundant-constraints -threaded -rtsopts -with-rtsopts=-N+  build-depends:+      QuickCheck+    , aeson >=2.0 && <3+    , base >=4.7 && <5+    , hspec+    , megaparsec >=9.0 && <10+    , megaparsec-utils+    , parser-combinators >=1.0 && <2+    , text >=2.0 && <3+    , uuid >=1.3 && <2+  default-language: Haskell2010

+ src/Text/Megaparsec/Utils.hs view

@@ -0,0 +1,167 @@+{-# LANGUAGE FlexibleContexts #-}+{-# LANGUAGE ScopedTypeVariables #-}+{-# LANGUAGE TypeFamilies #-}++-- |+-- Module      : Text.Megaparsec.Utils+-- Description : Various generic parsers and combinators.+-- Copyright   : (c) drlkf, 2024+-- License     : GPL-3+-- Maintainer  : drlkf@drlkf.net+-- Stability   : experimental+module Text.Megaparsec.Utils (+  boolParser,+  boundedEnumShowParser,+  commaSeparated,+  numParser,+  occurrence,+  occurrences,+  parsecToJSONParser,+  parsecToReadsPrec,+  posDecNumParser,+  posNumParser,+  uuidParser,+) where++import Control.Applicative (many, some, (<|>))+import Control.Applicative.Combinators (choice)+import Control.Monad (replicateM)+import Control.Monad.Combinators (optional)+import Data.Aeson.Types (Parser, Value, withText)+import Data.Functor (($>))+import Data.List (intercalate, sortOn)+import Data.List.NonEmpty (NonEmpty ((:|)))+import Data.Maybe (fromJust)+import qualified Data.Text as T (unpack)+import Data.UUID (UUID)+import qualified Data.UUID as U (fromString)+import Text.Megaparsec (+  Parsec,+  ShowErrorComponent,+  anySingle,+  errorBundlePretty,+  runParser,+  try,+ )+import Text.Megaparsec.Char (+  char,+  digitChar,+  hexDigitChar,+  string',+ )+import Text.Read (readMaybe)++-- | Parse a case-insensitive human-readable boolean, including C-style numbers+-- and English yes-no.+boolParser+  :: Ord e+  => Parsec e String Bool+boolParser = true <|> false+ where+  true = True <$ choice (map string' ["true", "y", "yes", "1"])+  false = False <$ choice (map string' ["false", "n", "no", "0"])++-- | Parse a 'Bounded' 'Enum' type that has a 'Show' instance, trying all+-- possibilities, case-insensitive, in the 'Enum' order.+boundedEnumShowParser+  :: forall a e+   . Ord e+  => Bounded a+  => Enum a+  => Show a+  => Parsec e String a+boundedEnumShowParser =+  choice . map parseShow $ sortOn (negate . length . show) [(minBound :: a) ..]+ where+  parseShow a = string' (show a) $> a++-- | Parse a comma-separated list of items.+commaSeparated+  :: Ord e+  => Parsec e String a+  -> Parsec e String (NonEmpty a)+commaSeparated p = (:|) <$> p <*> many (char ',' >> p)++-- | Parse any occurrence of a given parser. Consumes any input before occurrence.+occurrence+  :: Ord e+  => Parsec e String a+  -> Parsec e String a+occurrence p = go+ where+  go = p <|> (anySingle >> go)++-- | Parse all occurrences of a given parser.+occurrences+  :: Ord e+  => Parsec e String a+  -> Parsec e String [a]+occurrences = some . try . occurrence . try++-- | Parse a positive number, with or without decimals prefixed by a @.@.+posDecNumParser+  :: Ord e+  => Read a+  => Parsec e String a+posDecNumParser = do+  num <- some digitChar+  dec <- maybe "" ("." <>) <$> optional (char '.' >> some digitChar)++  let str = num <> dec++  maybe (fail ("could not read from input: " <> str)) pure (readMaybe str)++-- | Parse a positive integer.+posNumParser+  :: Ord e+  => Read a+  => Parsec e String a+posNumParser = do+  digits <- some digitChar+  maybe+    (fail ("could not read from digits: " <> digits))+    pure+    (readMaybe digits) ++-- | Parse an integer, without any space between minus sign and digits.+numParser+  :: Ord e+  => Num a+  => Read a+  => Parsec e String a+numParser = (char '-' >> negate <$> posNumParser) <|> posNumParser++-- | Convert a 'Parsec' parser into a 'Parser' suited for 'Data.Aeson.FromJSON'+-- instances.+parsecToJSONParser+  :: ShowErrorComponent e+  => String+  -- ^ Parser name.+  -> Parsec e String a+  -- ^ Parser.+  -> (Value -> Parser a)+parsecToJSONParser n p =+  withText n (either (fail . errorBundlePretty) pure . runParser p n . T.unpack)++-- | Convert a 'Parsec' parser into a 'ReadS' parser. Useful for defining 'Read'+-- instances with 'Text.Megaparsec'.+parsecToReadsPrec+  :: Parsec e String a+  -> ReadS a+parsecToReadsPrec p = either (const []) (\x -> [(x, "")]) . runParser p "string"++-- | Parse a RFC4122-compliant UUID.+uuidParser+  :: Ord e+  => Parsec e String UUID+uuidParser = do+  part1 <- replicateM 8 hexDigitChar <* char '-'+  part2 <- replicateM 4 hexDigitChar <* char '-'+  part3 <- replicateM 4 hexDigitChar <* char '-'+  part4 <- replicateM 4 hexDigitChar <* char '-'+  part5 <- replicateM 12 hexDigitChar++  pure+    (fromJust+     (U.fromString+      (intercalate "-" [part1, part2, part3, part4, part5])))

+ test/Spec.hs view

@@ -0,0 +1,2 @@+{-# OPTIONS_GHC -F -pgmF hspec-discover #-}+{-# OPTIONS_GHC -Wno-missing-export-lists #-}

+ test/Text/Megaparsec/UtilsSpec.hs view

@@ -0,0 +1,251 @@+{-# LANGUAGE TypeApplications #-}+{-# OPTIONS_GHC -Wno-orphans #-}++module Text.Megaparsec.UtilsSpec (+  spec,+) where++import Control.Applicative (some)+import Control.Applicative.Combinators (choice)+import Control.Monad (void)+import Data.Bifunctor (first)+import Data.Char (isAlphaNum, toUpper)+import Data.Either (isLeft)+import Data.List (intercalate)+import Data.List.NonEmpty (NonEmpty ((:|)))+import qualified Data.List.NonEmpty as N (toList)+import Data.Void (Void)+import Test.Hspec (+  Expectation,+  Spec,+  SpecWith,+  context,+  describe,+  it,+  shouldBe,+  shouldSatisfy,+ )+import Test.QuickCheck (+  Arbitrary (..),+  Gen,+  elements,+  forAll,+  listOf,+  listOf1,+  property,+  suchThat,+ )+import Text.Megaparsec (+  Parsec,+  eof,+  errorBundlePretty,+  parseMaybe,+  runParser,+ )+import Text.Megaparsec.Char (+  alphaNumChar,+  char,+  digitChar,+  string,+ )+import Text.Megaparsec.Utils (+  boundedEnumShowParser,+  commaSeparated,+  numParser,+  occurrence,+  occurrences,+  posDecNumParser,+  posNumParser,+ )+import Text.Printf (printf)++newtype SomeData = SomeData Int+  deriving Eq++instance Show SomeData where+  show (SomeData i) = show i++instance Arbitrary SomeData where+  arbitrary = SomeData . abs <$> arbitrary++someDataParser :: Parsec Void String SomeData+someDataParser = SomeData . read <$> some digitChar++data SomeEnum+  = SomeA+  | SomeB+  | SomeC+  deriving (Eq, Show, Enum, Bounded)++instance Arbitrary SomeEnum where+  arbitrary = elements [SomeA, SomeB, SomeC]++showableParser :: Show a => a -> Parsec Void String a+showableParser a = string (show a) >> pure a++someEnumParser :: Parsec Void String SomeEnum+someEnumParser = choice $ map showableParser [(minBound :: SomeEnum) ..]++data SomeADT = SomeADT+  { _id :: Int+  , _name :: String+  , _type :: SomeEnum+  }+  deriving Eq++instance Show SomeADT where+  show (SomeADT i n t) = intercalate "," [show i, n, show t]++instance Arbitrary SomeADT where+  arbitrary =+    SomeADT . abs+      <$> arbitrary+      <*> listOf1 (arbitrary `suchThat` isAlphaNum)+      <*> arbitrary++someADTParser :: Parsec Void String SomeADT+someADTParser = do+  i <- read <$> some digitChar+  void $ char ','+  n <- some alphaNumChar+  void $ char ','+  SomeADT i n <$> someEnumParser++input :: Arbitrary a => Gen (String, a, String)+input =+  (,,)+    <$> listOf (arbitrary `suchThat` flip notElem forbiddenChars)+    <*> arbitrary+    <*> listOf (arbitrary `suchThat` flip notElem forbiddenChars)+ where+  forbiddenChars = ['0' .. '9'] ++ concatMap show [(minBound :: SomeEnum) ..]++exhaustive+  :: Show a+  => Enum a+  => Bounded a+  => (a -> Expectation)+  -> SpecWith ()+exhaustive f = foldl1 (>>) $ mkIt <$> values+ where+  mkIt v = it (pad (show v)) $ f v+  padNum = foldr (max . length . show) 0 values+  pad s = s ++ replicate (padNum - length s) ' '+  values = [minBound ..]++instance Arbitrary a => Arbitrary (NonEmpty a) where+  arbitrary = (:|) <$> arbitrary <*> arbitrary++parseOrPrettyError+  :: Parsec Void String a+  -> String+  -> Either String a+parseOrPrettyError p = first errorBundlePretty . runParser p "test"++spec :: Spec+spec = do+  let parseMaybe' = parseMaybe @Void++  describe "parsers" $ do+    it "SomeData" . property $ \v ->+      parseMaybe' someDataParser (show (v :: SomeData)) `shouldBe` Just v++    it "SomeEnum" . property $ \v ->+      parseMaybe' someEnumParser (show (v :: SomeEnum)) `shouldBe` Just v++    it "SomeADT" . property $ \v ->+      parseMaybe' someADTParser (show (v :: SomeADT)) `shouldBe` Just v++    context "posDecNumParser" $ do+      it "no decimals" . property $ \v ->+        parseMaybe' posDecNumParser (show (abs (v :: Int)))+          `shouldBe` Just (fromIntegral (abs v))++      it "decimals" . property $ \v ->+        parseMaybe' posDecNumParser (printf "%f" (abs (v :: Double)))+          `shouldBe` Just (abs v)++    it "posNumParser" . property $ \v ->+      parseMaybe' posNumParser (show (abs (v :: Int))) `shouldBe` Just (abs v)++    it "numParser" . property $ \v ->+      parseMaybe' numParser (show (v :: Int)) `shouldBe` Just v++  describe "boundedEnumShowParser" $ do+    context "lowercase" . exhaustive $ \v ->+      parseMaybe' (boundedEnumShowParser <* eof) (show v) `shouldBe` Just (v :: SomeEnum)++    context "uppercase" . exhaustive $ \v ->+      parseMaybe' (boundedEnumShowParser <* eof) (map toUpper (show v))+        `shouldBe` Just (v :: SomeEnum)++    context "mixed" . exhaustive $ \v -> do+      let capitalize i x+            | even i = toUpper x+            | otherwise = x++          mixCase = zipWith capitalize [(0 :: Int) ..]+      parseMaybe' (boundedEnumShowParser <* eof) (mixCase (show v))+        `shouldBe` Just (v :: SomeEnum)++  describe "occurrence" $ do+    it "SomeData" . forAll input $ \(prefix, v, suffix) -> do+      let s = unwords [prefix, show (v :: SomeData), suffix]+      parseOrPrettyError (occurrence someDataParser) s `shouldBe` Right v++    it "SomeEnum" . forAll input $ \(prefix, v, suffix) -> do+      let s = unwords [prefix, show (v :: SomeEnum), suffix]+      parseOrPrettyError (occurrence someEnumParser) s `shouldBe` Right v++    it "SomeADT" . forAll input $ \(prefix, v, suffix) -> do+      let s = unwords [prefix, show (v :: SomeADT), suffix]+      parseOrPrettyError (occurrence someADTParser) s `shouldBe` Right v++  describe "occurrences" $ do+    it "SomeData" . forAll input $ \(prefix, v, suffix) -> do+      let s = unwords [prefix, show (v :: SomeData), suffix]+      parseOrPrettyError (occurrences someDataParser) s `shouldBe` Right [v]++    context "SomeEnum" $ do+      it "words" . forAll input $ \(prefix, v, suffix) -> do+        let s = unwords [prefix, show (v :: SomeEnum), suffix]+        parseOrPrettyError (occurrences someEnumParser) s `shouldBe` Right [v]++      it "with partial" $+        parseOrPrettyError (occurrences someEnumParser) "a [Some] SomeA yo"+          `shouldBe` Right [SomeA]++    it "SomeADT" . forAll input $ \(prefix, v, suffix) -> do+      let s = unwords [prefix, show (v :: SomeADT), suffix]+      parseOrPrettyError (occurrences someADTParser) s `shouldBe` Right [v]++  describe "comma-separated" $ do+    context "valid" $ do+      it "single" . property $ \x -> do+        let y = abs x+        parseOrPrettyError (commaSeparated numParser) (show y)+          `shouldBe` Right (y :| [] :: NonEmpty Int)++      it "multiple" . property $ \xs -> do+        let ys = fmap abs xs+            s = intercalate "," (map show (N.toList ys))++        parseOrPrettyError (commaSeparated numParser) s+          `shouldBe` Right (ys :: NonEmpty Int)++    context "invalid" $ do+      it "empty" $+        parseOrPrettyError (commaSeparated (numParser @Void @Int)) ""+        `shouldSatisfy` isLeft++      it "first" $+        parseOrPrettyError (commaSeparated (numParser @Void @Int)) "test"+        `shouldSatisfy` isLeft++      it "first partially correct" $+        parseOrPrettyError (commaSeparated ((numParser @Void @Int) <* eof)) "test"+        `shouldSatisfy` isLeft++      it "second" $+        parseOrPrettyError (commaSeparated (numParser @Void @Int)) "test"+        `shouldSatisfy` isLeft