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-rw-r--r--src/Text/Pandoc/CharacterReferences.hs72
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diff --git a/src/Text/Pandoc/CharacterReferences.hs b/src/Text/Pandoc/CharacterReferences.hs
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--- a/src/Text/Pandoc/CharacterReferences.hs
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-{-
-Copyright (C) 2006-2010 John MacFarlane <jgm@berkeley.edu>
-
-This program is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2 of the License, or
-(at your option) any later version.
-
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with this program; if not, write to the Free Software
-Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
--}
-
-{- |
- Module : Text.Pandoc.CharacterReferences
- Copyright : Copyright (C) 2006-2010 John MacFarlane
- License : GNU GPL, version 2 or above
-
- Maintainer : John MacFarlane <jgm@berkeley.edu>
- Stability : alpha
- Portability : portable
-
-Functions for parsing character references.
--}
-module Text.Pandoc.CharacterReferences (
- characterReference,
- decodeCharacterReferences,
- ) where
-import Text.ParserCombinators.Parsec
-import Text.HTML.TagSoup.Entity ( lookupNamedEntity, lookupNumericEntity )
-import Data.Maybe ( fromMaybe )
-
--- | Parse character entity.
-characterReference :: GenParser Char st Char
-characterReference = try $ do
- char '&'
- character <- numRef <|> entity
- char ';'
- return character
-
-numRef :: GenParser Char st Char
-numRef = do
- char '#'
- num <- hexNum <|> decNum
- return $ fromMaybe '?' $ lookupNumericEntity num
-
-hexNum :: GenParser Char st [Char]
-hexNum = do
- x <- oneOf "Xx"
- num <- many1 hexDigit
- return (x:num)
-
-decNum :: GenParser Char st [Char]
-decNum = many1 digit
-
-entity :: GenParser Char st Char
-entity = do
- body <- many1 alphaNum
- return $ fromMaybe '?' $ lookupNamedEntity body
-
--- | Convert entities in a string to characters.
-decodeCharacterReferences :: String -> String
-decodeCharacterReferences str =
- case parse (many (characterReference <|> anyChar)) str str of
- Left err -> error $ "\nError: " ++ show err
- Right result -> result
-