Source

text / scripts / Arsec.hs

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module Arsec
    (
      comment
    , semi
    , showC
    , unichar
    , unichars
    , module Control.Applicative
    , module Control.Monad
    , module Data.Char
    , module Text.ParserCombinators.Parsec.Char
    , module Text.ParserCombinators.Parsec.Combinator
    , module Text.ParserCombinators.Parsec.Error
    , module Text.ParserCombinators.Parsec.Prim
    ) where

import Control.Monad
import Control.Applicative
import Data.Char
import Numeric
import Text.ParserCombinators.Parsec.Char hiding (lower, upper)
import Text.ParserCombinators.Parsec.Combinator hiding (optional)
import Text.ParserCombinators.Parsec.Error
import Text.ParserCombinators.Parsec.Prim hiding ((<|>), many)

instance Applicative (GenParser s a) where
    pure = return
    (<*>) = ap
    
instance Alternative (GenParser s a) where
    empty = mzero
    (<|>) = mplus

unichar :: Parser Char
unichar = chr . fst . head . readHex <$> many1 hexDigit

unichars :: Parser [Char]
unichars = manyTill (unichar <* spaces) semi

semi :: Parser ()
semi = char ';' *> spaces *> pure ()

comment :: Parser String
comment = (char '#' *> manyTill anyToken (char '\n')) <|> string "\n"

showC :: Char -> String
showC c = "'\\x" ++ d ++ "'"
    where h = showHex (ord c) ""
          d = replicate (4 - length h) '0' ++ h
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