parsable (empty) → 0.1.0.0

raw patch · 4 files changed

+921/−0 lines, 4 filesdep +basedep +parsecdep +text

Dependencies added: base, parsec, text, transformers

Files

• CHANGELOG.md +5/−0
• LICENSE +661/−0
• parsable.cabal +77/−0
• src/Data/Parsable.hs +178/−0

@@ -0,0 +1,5 @@+# Revision history for parsable++## 0.1.0.0 -- YYYY-mm-dd++* First version. Released on an unsuspecting world.

@@ -0,0 +1,661 @@+                    GNU AFFERO GENERAL PUBLIC LICENSE+                       Version 3, 19 November 2007++ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>+ Everyone is permitted to copy and distribute verbatim copies+ of this license document, but changing it is not allowed.++                            Preamble++  The GNU Affero General Public License is a free, copyleft license for+software and other kinds of works, specifically designed to ensure+cooperation with the community in the case of network server software.++  The licenses for most software and other practical works are designed+to take away your freedom to share and change the works.  By contrast,+our General Public Licenses are intended to guarantee your freedom to+share and change all versions of a program--to make sure it remains free+software for all its users.++  When we speak of free software, we are referring to freedom, not+price.  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@@ -0,0 +1,77 @@+cabal-version:      3.0+name:               parsable+version:            0.1.0.0+synopsis:           Parsable and Printable classes++tested-with:        GHC == { 9.0.2, 9.2.8, 9.4.8, 9.6.6, 9.8.4, 9.10.1, 9.12.1 }++description:+    Provides the Parsable and Printable classes, which form a round-trip+    equivalence between a data type and a String. Useful for types that+    are generated directly from a String and need their internal+    representation to be converted back to a String.++homepage:           https://github.com/gentoo-haskell/cabal-portage/tree/main/parsable+bug-reports:        https://github.com/gentoo-haskell/cabal-portage/issues++license:            AGPL-3.0-only+license-file:       LICENSE+author:             Gentoo Authors+maintainer:         hololeap@protonmail.com++copyright:          Copyright (C) 2022-2025 Gentoo Authors+category:           Text+extra-doc-files: CHANGELOG.md++source-repository head+    type:           git+    location:       https://github.com/hololeap/cabal-portage.git+    branch:         main+    subdir:         parsable++flag pedantic+    description: Enable -Werror+    default:     False+    manual:      True++common all+    ghc-options:        -Wall+                        -foptimal-applicative-do+    if flag(pedantic)+        ghc-options:    -Werror++library+    import: all+    exposed-modules:+        , Data.Parsable++    other-extensions:+        , ConstrainedClassMethods+        , DefaultSignatures+        , DeriveTraversable+        , FlexibleContexts+        , FlexibleInstances+        , LambdaCase+        , TypeFamilies++    build-depends:+        , base >=4.13 && <5+        , parsec <3.2+        , transformers <0.7+        , text <2.2+    hs-source-dirs:   src+    default-language: Haskell2010++    other-extensions:+        , ConstrainedClassMethods+        , DefaultSignatures+        , DeriveGeneric+        , DeriveTraversable+        , DerivingVia+        , FlexibleContexts+        , FlexibleInstances+        , GeneralizedNewtypeDeriving+        , LambdaCase+        , ScopedTypeVariables+        , TypeApplications+        , TypeFamilies

@@ -0,0 +1,178 @@+{-|+Module      : Data.Parsable++This module contains two simple classes, 'Parsable' and 'Printable'.++There is an implicit "soft isomorphism" between 'parser' and 'toString'.+(Successfully parsing a string and then running 'toString' on the result+should result in the original string.)++=== Language extensions++Because 'parser' does not take any arguments, it may be necessary+to explicitly declare the type of @t@ for these functions.++It may be helpful to enable and use the @TypeApplications@ and possibly+@ScopedTypeVariables@ extensions..++Look at the @Language Extensions@ section of the GHC documentation for+instructions on how to use these extensions.+-}++{-# Language DefaultSignatures #-}+{-# Language DeriveDataTypeable #-}+{-# Language DeriveGeneric #-}+{-# Language DeriveTraversable #-}+{-# Language DerivingVia #-}+{-# Language FlexibleContexts #-}+{-# Language FlexibleInstances #-}+{-# Language GeneralizedNewtypeDeriving #-}+{-# Language MultiParamTypeClasses #-}+{-# Language OverloadedStrings #-}+{-# Language QuantifiedConstraints #-}+{-# Language ScopedTypeVariables #-}+{-# Language TypeApplications #-}+{-# Language TypeFamilies #-}+{-# Language UndecidableInstances #-}++module Data.Parsable+    (+    -- * Parsing+      Parsable(..)+    , ParserName(..)+    , runParsableT+    , runParsable+    -- ** Wrappers+    , NaturalParsable(..)+    -- * Parsing functions+    , satisfyAny+    , wordAllowed+    , readParsec+    -- * Printing+    , Printable(..)+    , toText+    -- ** Wrappers+    , ShowPrintable(..)+    -- * Re-exports+    , module Control.Monad+    , module Control.Monad.Trans.Class+    , module Data.Char+    , module Data.Functor.Identity+    , module Data.String+    , module Text.Parsec+    , module Text.Parsec.Char+    ) where++import Control.Applicative hiding (many)+import Control.Monad+import Control.Monad.Trans.Class+import Data.Char+import Data.Data+import Data.Functor.Identity+import Data.Kind+import Data.String+import Data.Text (Text, unpack)+import GHC.Generics+import Text.Parsec+import Text.Parsec.Char+import Text.Read (readMaybe)++newtype ParserName a s u (m :: Type -> Type) = ParserName { getParserName :: String }+    deriving stock (Show, Eq, Ord)+    deriving newtype IsString++-- | Represents types that have a valid Parsec parser.+class Parsable a (m :: Type -> Type) u s where+    parser :: ParsecT s u m a+    parserName :: ParserName a s u m+    {-# Minimal parser, parserName #-}++newtype NaturalParsable a = NaturalParsable+    { unwrapNaturalParsable :: a }++instance (Stream s m Char, Read a, Typeable a)+    => Parsable (NaturalParsable a) m u s where+    parserName = "natural number"+    parser = (<?> "natural number") $ do+        ds <- some (satisfy isDigit)+        case readMaybe ds of+            Just i -> pure $ NaturalParsable i+            Nothing -> fail $ "Could not parse as " ++ t ++ ": " ++ show ds+      where+        t = show $ typeRep $ Proxy @a++-- | Convenience function to run a 'Parsable' parser.+runParsableT :: forall a m s. (Stream s m Char, Parsable a m () s)+    => String -> s -> m (Either ParseError a)+runParsableT = runParserT (parser <?> n) ()+    where n = getParserName $ parserName @a @m @() @s++runParsable :: forall a s. (Stream s Identity Char, Parsable a Identity () s)+    => String -> s -> Either ParseError a+runParsable = runParser (parser <?> n) ()+    where n = getParserName $ parserName @a @Identity @() @s++-- | Pass a previously-parsed string to this function in order to attempt+--   using 'read'. Produces proper error messages on failure.+readParsec :: forall a s u m. (Typeable a, Read a) => String -> ParsecT s u m a+readParsec s = (<?> typeName ++ " (Read instance)") $+    case readMaybe s of+        Just x -> pure x+        Nothing -> fail+            $  "unable to parse using "+            ++ typeName+            ++ " Read instance: "+            ++ show s+    where typeName = show $ typeRep $ Proxy @a++-- | Parse a token that satisfies any of the given predicates+satisfyAny :: Stream s m Char => [Char -> Bool] -> ParsecT s u m Char+satisfyAny fs = satisfy $ \c -> or [f c | f <- fs]++-- | Parsing of "words" which require a list of predicates for the first+--   token, and a list of predicates for any remaining tokens. This always+--   parses at least one token.+wordAllowed :: Stream s m Char+    => [Char -> Bool] -- ^ Tokens that start the word+    -> [Char -> Bool] -- ^ Any subsequent tokens+    -> ParsecT s u m [Char]+wordAllowed beg rest = (:) <$> satisfyAny beg <*> many (satisfyAny rest)++-- | Types that can be converted back to a @String@.+class Printable t where+    toString :: t -> String++    default toString :: Show t => t -> String+    toString = show+    {-# Minimal toString #-}++instance Printable String where+    toString = id++instance Printable Text where+    toString = unpack++-- | Convenience function that will turn a 'Printable' to any 'IsString'.+toText :: (Printable t, IsString s) => t -> s+toText = fromString . toString++-- | Wrapper for types that inherit 'toString' directly from their 'Show' instance.+--+--   It is convenient to use the @DerivingVia@ language extension with this.+--+--   > {-# Language DerivingVia #-}+--   >+--   > newtype MyNum Int+--   >     deriving Printable via (ShowPrintable Int) -- Uses Show instance of Int+newtype ShowPrintable a = ShowPrintable+    { unwrapShowPrintable :: a }+    deriving stock+        ( Read, Show, Eq, Ord, Bounded, Functor, Foldable, Traversable, Generic+        , Generic1, Data+        )+    deriving newtype (Enum, Num, Fractional, Floating, IsString, Semigroup, Monoid)+    deriving (Applicative, Monad) via Identity++-- | Uses 'show' after unwrapping the contents.+instance Show a => Printable (ShowPrintable a) where+    toString = show . unwrapShowPrintable