module Text.Highlighting.Kate.Syntax.M3u ( highlight, parseExpression, syntaxName, syntaxExtensions ) where
import Text.Highlighting.Kate.Definitions
import Text.Highlighting.Kate.Common
import Text.ParserCombinators.Parsec
import Control.Monad (when)
import Data.Map (fromList)
import Data.Maybe (fromMaybe, maybeToList)
syntaxName :: String
syntaxName = "M3U"
syntaxExtensions :: String
syntaxExtensions = "*.m3u"
highlight :: String -> Either String [SourceLine]
highlight input =
case runParser parseSource startingState "source" input of
Left err -> Left $ show err
Right result -> Right result
parseExpression :: GenParser Char SyntaxState LabeledSource
parseExpression = do
st <- getState
let oldLang = synStLanguage st
setState $ st { synStLanguage = "M3U" }
context <- currentContext <|> (pushContext "M3U" >> currentContext)
result <- parseRules context
updateState $ \st -> st { synStLanguage = oldLang }
return result
parseSource = do
lineContents <- lookAhead wholeLine
updateState $ \st -> st { synStCurrentLine = lineContents }
result <- manyTill parseSourceLine eof
return $ map normalizeHighlighting result
startingState = SyntaxState {synStContexts = fromList [("M3U",["M3U"])], synStLanguage = "M3U", synStCurrentLine = "", synStCharsParsedInLine = 0, synStPrevChar = '\n', synStCaseSensitive = True, synStKeywordCaseSensitive = True, synStCaptures = []}
parseSourceLine = manyTill parseExpressionInternal pEndLine
pEndLine = do
lookAhead $ newline <|> (eof >> return '\n')
context <- currentContext
case context of
"M3U" -> return () >> pHandleEndLine
"FindEXTINF" -> return () >> pHandleEndLine
_ -> pHandleEndLine
withAttribute attr txt = do
when (null txt) $ fail "Parser matched no text"
let labs = attr : maybeToList (lookup attr styles)
st <- getState
let oldCharsParsed = synStCharsParsedInLine st
let prevchar = if null txt then '\n' else last txt
updateState $ \st -> st { synStCharsParsedInLine = oldCharsParsed + length txt, synStPrevChar = prevchar }
return (labs, txt)
styles = [("M3USpec","kw"),("Comment","co"),("EXTINF","ot"),("Lenght","dv"),("Descr","st")]
parseExpressionInternal = do
context <- currentContext
parseRules context <|> (pDefault >>= withAttribute (fromMaybe "" $ lookup context defaultAttributes))
regex_'23'2e'2a'24 = compileRegex "#.*$"
regex_'3a'5cd'2b = compileRegex ":\\d+"
regex_'2c'2e'2a'24 = compileRegex ",.*$"
defaultAttributes = [("M3U","Normal Text"),("FindEXTINF","Normal Text")]
parseRules "M3U" =
do (attr, result) <- (((pColumn 0 >> pString False "#EXTM3U" >>= withAttribute "M3USpec") >>~ (popContext))
<|>
((pColumn 0 >> pString False "#EXTINF" >>= withAttribute "EXTINF") >>~ pushContext "FindEXTINF")
<|>
((pFirstNonSpace >> pRegExpr regex_'23'2e'2a'24 >>= withAttribute "Comment")))
return (attr, result)
parseRules "FindEXTINF" =
do (attr, result) <- (((pRegExpr regex_'3a'5cd'2b >>= withAttribute "Lenght"))
<|>
((pRegExpr regex_'2c'2e'2a'24 >>= withAttribute "Descr") >>~ (popContext)))
return (attr, result)
parseRules x = fail $ "Unknown context" ++ x