    {- This module was generated from data in the Kate syntax highlighting file texinfo.xml, version 0.2,
       by  Daniel Franke (franke.daniel@gmail.com) -}

    module Text.Highlighting.Kate.Syntax.Texinfo ( highlight, parseExpression, syntaxName, syntaxExtensions ) where
    import Text.Highlighting.Kate.Definitions
    import Text.Highlighting.Kate.Common
    import qualified Text.Highlighting.Kate.Syntax.Alert
    import Text.ParserCombinators.Parsec
    import Data.List (nub)
    import Data.Map (fromList)
    import Data.Maybe (fromMaybe)

    -- | Full name of language.
    syntaxName :: String
    syntaxName = "Texinfo"

    -- | Filename extensions for this language.
    syntaxExtensions :: String
    syntaxExtensions = "*.texi"

    -- | Highlight source code using this syntax definition.
    highlight :: String -> Either String [SourceLine]
    highlight input =
      case runParser parseSource startingState "source" input of
        Left err     -> Left $ show err
        Right result -> Right result

    -- | Parse an expression using appropriate local context.
    parseExpression :: GenParser Char SyntaxState LabeledSource
    parseExpression = do
      st <- getState
      let oldLang = synStLanguage st
      setState $ st { synStLanguage = "Texinfo" }
      context <- currentContext <|> (pushContext "Normal Text" >> 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 [("Texinfo",["Normal Text"])], synStLanguage = "Texinfo", synStCurrentLine = "", synStCharsParsedInLine = 0, synStCaseSensitive = True, synStKeywordCaseSensitive = True, synStCaptures = []}

    parseSourceLine = manyTill parseExpressionInternal pEndLine

    pEndLine = do
      newline <|> (eof >> return '\n')
      context <- currentContext
      case context of
        "Normal Text" -> return ()
        "singleLineComment" -> (popContext >> return ())
        "multiLineComment" -> return ()
        "nodeFolding" -> return ()
        "folding" -> return ()
        _ -> return ()
      lineContents <- lookAhead wholeLine
      updateState $ \st -> st { synStCurrentLine = lineContents, synStCharsParsedInLine = 0 }

    withAttribute attr txt = do
      if null txt
         then fail "Parser matched no text"
         else return ()
      let style = fromMaybe "" $ lookup attr styles
      st <- getState
      let oldCharsParsed = synStCharsParsedInLine st
      updateState $ \st -> st { synStCharsParsedInLine = oldCharsParsed + length txt }
      return (nub [style, attr], txt)

    styles = [("Normal Text","Normal"),("Comment","Comment"),("Command","Function")]

    parseExpressionInternal = do
      context <- currentContext
      parseRules context <|> (pDefault >>= withAttribute (fromMaybe "" $ lookup context defaultAttributes))

    defaultAttributes = [("Normal Text","Normal Text"),("singleLineComment","Comment"),("multiLineComment","Comment"),("nodeFolding","Normal Text"),("folding","Normal Text")]

    parseRules "Normal Text" =
      do (attr, result) <- (((pRegExpr (compileRegex "@c(omment)?\\b") >>= withAttribute "Comment") >>~ pushContext "singleLineComment")
                            <|>
                            ((pRegExpr (compileRegex "@ignore\\b") >>= withAttribute "Comment") >>~ pushContext "multiLineComment")
                            <|>
                            ((pRegExpr (compileRegex "@node\\b") >>= withAttribute "Command") >>~ pushContext "nodeFolding")
                            <|>
                            ((pRegExpr (compileRegex "@(menu|smallexample|table|multitable)\\b") >>= withAttribute "Command") >>~ pushContext "folding")
                            <|>
                            ((pRegExpr (compileRegex "@[\\w]+(\\{([\\w]+[\\s]*)+\\})?") >>= withAttribute "Command")))
         return (attr, result)

    parseRules "singleLineComment" =
      do (attr, result) <- ((Text.Highlighting.Kate.Syntax.Alert.parseExpression >>= ((withAttribute "") . snd)))
         return (attr, result)

    parseRules "multiLineComment" =
      do (attr, result) <- (((pString False "@end ignore" >>= withAttribute "Comment") >>~ (popContext >> return ()))
                            <|>
                            ((Text.Highlighting.Kate.Syntax.Alert.parseExpression >>= ((withAttribute "") . snd))))
         return (attr, result)

    parseRules "nodeFolding" =
      do (attr, result) <- (((lookAhead (pRegExpr (compileRegex "@node\\b")) >> return ([],"") ) >>~ (popContext >> return ()))
                            <|>
                            ((parseRules "Normal Text")))
         return (attr, result)

    parseRules "folding" =
      do (attr, result) <- (((pRegExpr (compileRegex "@end (menu|smallexample|table|multitable)\\b") >>= withAttribute "Command") >>~ (popContext >> return ()))
                            <|>
                            ((parseRules "Normal Text")))
         return (attr, result)

    parseRules x = fail $ "Unknown context" ++ x