74 lines
1.8 KiB
Haskell
74 lines
1.8 KiB
Haskell
-- | Paper over some differences between megaparsec 5 and 6,
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-- making it possible to write code that supports both.
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{-# LANGUAGE CPP, FlexibleContexts #-}
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module Text.Megaparsec.Compat (
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module Text.Megaparsec
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#if MIN_VERSION_megaparsec(6,0,0)
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,module Text.Megaparsec.Char
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#endif
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,MPErr
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,mptext
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,mpMkPos
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,mpUnPos
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,mpMkParseError
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)
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where
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import qualified Data.Set as S
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import Data.Text
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import Text.Megaparsec
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#if MIN_VERSION_megaparsec(6,0,0)
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import Text.Megaparsec.Char
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import Data.List.NonEmpty (fromList)
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import Data.Void (Void)
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-- | A basic parse error type.
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type MPErr = Void
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-- | Make a simple parse error.
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mpMkParseError :: FilePath -> String -> ParseError Char String
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mpMkParseError f s = FancyError (fromList [initialPos f]) (S.singleton $ ErrorFail s)
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-- | Make a Pos. With a negative argument, throws InvalidPosException (megaparsec >= 6)
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-- or calls error (megaparsec < 6).
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mpMkPos :: Int -> Pos
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mpMkPos = mkPos
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-- | Unmake a Pos.
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mpUnPos :: Pos -> Int
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mpUnPos = unPos
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-- | Parse and return some Text.
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mptext :: MonadParsec e Text m => Tokens Text -> m (Tokens Text)
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mptext = string
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#else
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import Text.Megaparsec.Prim (MonadParsec)
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-- | A basic parse error type.
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type MPErr = Dec
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-- | Make a simple parse error.
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mpMkParseError :: FilePath -> String -> ParseError Char String
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mpMkParseError f s = (mempty :: ParseError Char String){errorCustom = S.singleton $ f ++ ": " ++ s}
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-- | Make a Pos. With a negative argument, throws InvalidPosException (megaparsec >= 6)
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-- or calls error (megaparsec < 6).
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mpMkPos :: Int -> Pos
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mpMkPos = unsafePos . fromIntegral
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-- | Unmake a Pos.
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mpUnPos :: Pos -> Int
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mpUnPos = fromIntegral . unPos
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-- | Parse and return some Text.
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mptext :: MonadParsec e Text m => Text -> m Text
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mptext = fmap pack . string . unpack
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#endif
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