    {- This module was generated from data in the Kate syntax highlighting file erlang.xml, version 1.02,
       by  Bill Ross (bill@emailme.net.au) -}

    module Text.Highlighting.Kate.Syntax.Erlang ( 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 = "Erlang"

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

    -- | 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 = "Erlang" }
      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 [("Erlang",["Normal Text"])], synStLanguage = "Erlang", 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" -> (popContext >> return ())
        "isfunction" -> (popContext >> return ())
        "atomquote" -> (popContext >> return ())
        "stringquote" -> (popContext >> return ())
        "comment" -> (popContext >> 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"),("Keyword","Keyword"),("Pragma","Keyword"),("Function","Function"),("Separator","Function"),("Operator","Keyword"),("Variable","DataType"),("Integer","DecVal"),("Number","BaseN"),("Float","Float"),("Atom","Char"),("String","String"),("Comment","Comment")]

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

    defaultAttributes = [("Normal Text","Normal Text"),("isfunction","Function"),("atomquote","Atom"),("stringquote","String"),("comment","Comment")]

    parseRules "Normal Text" =
      do (attr, result) <- (((pColumn 0 >> pRegExpr (compileRegex "(?:-module|-export|-define|-undef|-ifdef|-ifndef|-else|-endif|-include|-include_lib)") >>= withAttribute "Pragma"))
                            <|>
                            ((pKeyword " \n\t.():!+,-<=>%&*/;?[]^{|}~\\" ["after","begin","case","catch","cond","end","fun","if","let","of","query","receive","all_true","some_true"] >>= withAttribute "Keyword"))
                            <|>
                            ((pKeyword " \n\t.():!+,-<=>%&*/;?[]^{|}~\\" ["div","rem","or","xor","bor","bxor","bsl","bsr","and","band","not","bnot"] >>= withAttribute "Operator"))
                            <|>
                            ((pRegExpr (compileRegex "(?:\\+|-|\\*|\\/|==|\\/=|=:=|=\\/=|<|=<|>|>=|\\+\\+|--|=|!|<-)") >>= withAttribute "Operator"))
                            <|>
                            ((pKeyword " \n\t.():!+,-<=>%&*/;?[]^{|}~\\" ["abs","accept","alarm","apply","atom_to_list","binary_to_list","binary_to_term","check_process_code","concat_binary","date","delete_module","disconnect_node","element","erase","exit","float","float_to_list","garbage_collect","get","get_keys","group_leader","halt","hd","integer_to_list","is_alive","is_atom","is_binary","is_boolean","is_float","is_function","is_integer","is_list","is_number","is_pid","is_port","is_process_alive","is_record","is_reference","is_tuple","length","link","list_to_atom","list_to_binary","list_to_float","list_to_integer","list_to_pid","list_to_tuple","load_module","loaded","localtime","make_ref","module_loaded","node","nodes","now","open_port","pid_to_list","port_close","port_command","port_connect","port_control","ports","pre_loaded","process_flag","process_info","processes","purge_module","put","register","registered","round","self","setelement","size","spawn","spawn_link","spawn_opt","split_binary","statistics","term_to_binary","throw","time","tl","trunc","tuple_to_list","unlink","unregister","whereis"] >>= withAttribute "Function"))
                            <|>
                            ((pRegExpr (compileRegex "(?:\\(|\\)|\\{|\\}|\\[|\\]|\\.|\\:|\\||\\|\\||;|\\,|\\?|->|\\#)") >>= withAttribute "Separator"))
                            <|>
                            ((pDetectSpaces >>= withAttribute "Normal Text"))
                            <|>
                            ((pDetectChar False '%' >>= withAttribute "Comment") >>~ pushContext "comment")
                            <|>
                            ((pRegExpr (compileRegex "\\b[a-z][_a-z@-Z0-9]*(?:(?=[^_a-z@-Z0-9])|$):\\b[a-z][_a-z@-Z0-9]*(?:(?=[^_a-z@-Z0-9])|$)") >>= withAttribute "Function") >>~ (popContext >> return ()))
                            <|>
                            ((lookAhead (pRegExpr (compileRegex "\\b[a-z][_a-z@-Z0-9]*(?:(?=[^_a-z@-Z0-9])|$)\\(")) >> return ([],"") ) >>~ pushContext "isfunction")
                            <|>
                            ((pRegExpr (compileRegex "\\b[_A-Z][_a-z@-Z0-9]*(?:(?=[^_a-z@-Z0-9])|$)") >>= withAttribute "Variable") >>~ (popContext >> return ()))
                            <|>
                            ((pDetectChar False '\'' >>= withAttribute "Atom") >>~ pushContext "atomquote")
                            <|>
                            ((pRegExpr (compileRegex "\\b[a-z][_a-z@-Z0-9]*(?:(?=[^_a-z@-Z0-9])|$)") >>= withAttribute "Atom") >>~ (popContext >> return ()))
                            <|>
                            ((pDetectChar False '"' >>= withAttribute "String") >>~ pushContext "stringquote")
                            <|>
                            ((pRegExpr (compileRegex "[0-9]+\\.[0-9]+(?:[eE][+-]?[0-9]+)?") >>= withAttribute "Float") >>~ (popContext >> return ()))
                            <|>
                            ((pRegExpr (compileRegex "\\d+#[a-zA-Z0-9]+") >>= withAttribute "Number") >>~ (popContext >> return ()))
                            <|>
                            ((pRegExpr (compileRegex "\\$\\S") >>= withAttribute "Integer") >>~ (popContext >> return ()))
                            <|>
                            ((pRegExpr (compileRegex "[0-9]+") >>= withAttribute "Integer") >>~ (popContext >> return ())))
         return (attr, result)

    parseRules "isfunction" =
      do (attr, result) <- ((pRegExpr (compileRegex "\\b[a-z][_a-z@-Z0-9]*(?:(?=[^_a-z@-Z0-9])|$)") >>= withAttribute "Function") >>~ (popContext >> return ()))
         return (attr, result)

    parseRules "atomquote" =
      do (attr, result) <- ((pRegExpr (compileRegex "(?:(?:\\\\')?[^']*)*'") >>= withAttribute "Atom") >>~ (popContext >> return ()))
         return (attr, result)

    parseRules "stringquote" =
      do (attr, result) <- ((pRegExpr (compileRegex "(?:(?:\\\\\")?[^\"]*)*\"") >>= withAttribute "String") >>~ (popContext >> return ()))
         return (attr, result)

    parseRules "comment" =
      do (attr, result) <- (((pDetectSpaces >>= withAttribute "Comment"))
                            <|>
                            ((Text.Highlighting.Kate.Syntax.Alert.parseExpression >>= ((withAttribute "") . snd)))
                            <|>
                            ((pDetectIdentifier >>= withAttribute "Comment")))
         return (attr, result)

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