Flippi-0.0.5: src/DeWikify.hs

{-
Copyright (c) 2004, Philippa Jane Cowderoy
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-}

module DeWikify (deWikify, pagenamePattern) 
where

import Text.XHtml
import Text.ParserCombinators.Parsec
import List

import ScriptSyntax

wikiParser sn = do l <- many (prependedUnderscore
                              <|> try (wikiLink sn)
                              <|> try (scriptLink sn)
                              <|> try newParagraph
                              <|> aCharacter
                             )
                   case l of 
                    (_:_) -> return (foldl1 (+++) l)
                    [] -> return (stringToHtml "")

newParagraph = do string "\n\n"
                  return (br +++ br)
               <|>
               do string "\r\n\r\n"
                  return (br +++ br)

wikiLink sn = do (l,t,_) <- linkPattern
                 return (anchor (stringToHtml t)
		         ! [href (sn ++ "?view=" ++ l)]
                        )

prependedUnderscore = do char '_'
                         try nextUnderscore
                          <|> try matchLink
                          <|> try matchScriptLink
                          <|> return (stringToHtml "_")                         
                    where matchLink = do (_,_,p) <- linkPattern 
                                         return (stringToHtml p)
                          nextUnderscore = do pu <- prependedUnderscore
                                              return (stringToHtml "_" +++ pu)

pagenamePattern = studlyCapsPattern

linkPattern = try $ do char '['
                       l <- pagenamePattern
                       char '|'
                       t <- manyTill anyChar (char ']')
                       return (l,t, ("["++l++"|"++t++"]"))
              <|>
              do p <- studlyCapsPattern
                 return (p,p,p)

studlyCapsPattern = do u1 <- upper
                       ls1 <- many1 lower
                       u2 <- upper
                       l2 <- lower
                       as <- many letter
                       return ([u1]++ls1++[u2]++[l2]++as)

aCharacter = do c <- anyChar
                return (stringToHtml [c])

deWikify sn wt = case (parse (wikiParser sn) "" wt) of
                  Left e -> stringToHtml ("Error in wikitext: "
                                          ++ 
                                          (show e)
                                         )
                  Right t -> t