+ --[Keyword]
+ listKeys :: a -> IO [String]
+
+data Markup = Text String
+ | Paragraph
+ | Link String String
+ | Bold [Markup]
+ | Emph [Markup]
+ | Heading Int [Markup]
+ | Url String
+ | Underline [Markup]
+ | Strike [Markup]
+ | Pre String
+ | List [[Markup]]
+
+type Document = [Markup]
+
+wikiParser :: GenParser Char st Document
+wikiParser = many1 pMain
+
+pPara :: GenParser Char st Markup
+pPara = count 2 pEol >> return (Paragraph)
+
+pLink :: GenParser Char st Markup
+pLink = do
+ string "[["
+ (l,d) <- pLinkContent
+ case d of
+ [] -> return (Link l l)
+ _ -> return (Link l d)
+
+pList :: GenParser Char st Markup
+pList = do
+ list <- many1 $ try pListItem
+ return (List list)
+
+pListItem :: GenParser Char st [Markup]
+pListItem = do
+ many1 pEol
+ char '*'
+ many pOneLine
+
+pHeading :: GenParser Char st Markup
+pHeading = do
+ many1 pEol
+ level <- many1 $ char '='
+ char ' '
+ s <- pStopAt (' ':level)
+ return (Heading (length level) s)
+
+pURL :: GenParser Char st Markup
+pURL = do
+ proto <- many1 letter
+ string "://"
+ s <- many1 (alphaNum <|> oneOf "?.:&-/")
+ return (Url (proto++"://"++s))
+
+pMail :: GenParser Char st Markup
+pMail = do
+ user <- many1 (alphaNum <|> oneOf ".-_")
+ char '@'
+ server <- many1 (alphaNum <|> oneOf ".-_")
+ return (Url ("mailto:"++user++"@"++server))
+
+
+pPre :: GenParser Char st Markup
+pPre = string "<pre>" >> do
+ s <- pString "</pre>"
+ return (Pre s)
+
+pBold,pEmph,pUnderline,pStrike :: GenParser Char st Markup
+pBold = pS "**" (\s -> Bold s)
+pEmph = pS "//" (\s -> Emph s)
+pUnderline = pS "__" (\s -> Underline s)
+pStrike = pS "--" (\s -> Strike s)
+pS s f = string s >> do
+ s <- pStopAt s
+ return (f s)
+
+pOtherChar :: GenParser Char st Markup
+pOtherChar = do
+ c <- noneOf "\n\r"
+ return (Text (c:[]))
+
+pText :: GenParser Char st Markup
+pText = do
+ t <- many1 alphaNum
+ return (Text t)
+
+pLinkContent :: GenParser Char st (String, String)
+pLinkContent = do try (string "]]" >> return ([],[]))
+ <|> try (do
+ string " | "
+ d <- pString "]]"
+ return ([],d))
+ <|> (do
+ c <- anyChar
+ (l,d) <- pLinkContent
+ return (c:l,d))
+
+pStopAt :: String -> GenParser Char st Document
+pStopAt xs = pUntil pOneLine xs
+
+pString :: String -> GenParser Char st String
+pString xs = pUntil anyChar xs
+
+pEol :: GenParser Char st Markup
+pEol = do
+ (string "\n" <|> string "\r\n")
+ return (Text "\r\n")
+
+pUntil :: GenParser Char st a -> String -> GenParser Char st [a]
+pUntil p xs = manyTill p (try $ string xs)
+
+pMain :: GenParser Char st Markup
+pMain = choice [
+ try (pHeading)
+ ,try pList
+ ,try (pPara)
+ ,try(pPre)
+ ,try(pBold)
+ ,try(pEmph)
+ ,try(pUnderline)
+ ,try(pStrike)
+ ,try (pLink)
+ ,try (pURL)
+ ,try (pMail)
+ ,pText
+ ,pOtherChar
+ ,pEol
+ ]
+
+pOneLine = choice [
+ try pBold
+ ,try pEmph
+ ,try pUnderline
+ ,try pStrike
+ ,try pLink
+ ,try pURL
+ ,try pMail
+ ,pText
+ ,pOtherChar
+ ]
+