module Text.Highlighting.Kate.Syntax.Changelog ( 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 = "ChangeLog"
syntaxExtensions :: String
syntaxExtensions = "ChangeLog"
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 = "ChangeLog" }
context <- currentContext <|> (pushContext "Normal" >> 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 [("ChangeLog",["Normal"])], synStLanguage = "ChangeLog", 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
"Normal" -> return () >> pHandleEndLine
"line" -> (popContext) >> pEndLine
"entry" -> (popContext) >> pEndLine
_ -> 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 = [("Name","kw"),("E-Mail","ot"),("Date","dt"),("Entry","dv")]
parseExpressionInternal = do
context <- currentContext
parseRules context <|> (pDefault >>= withAttribute (fromMaybe "" $ lookup context defaultAttributes))
regex_'5cd'5cd'5cd'5cd'5cs'2a'2d'5cs'2a'5cd'5cd'5cs'2a'2d'5cs'2a'5cd'5cd'5cs'2a = compileRegex "\\d\\d\\d\\d\\s*-\\s*\\d\\d\\s*-\\s*\\d\\d\\s*"
regex_'28'5cw'5cs'2a'29'2b = compileRegex "(\\w\\s*)+"
regex_'3c'2e'2a'3e'5cs'2a'24 = compileRegex "<.*>\\s*$"
regex_'2e'2a'3a = compileRegex ".*:"
defaultAttributes = [("Normal","Normal Text"),("line","Normal Text"),("entry","Normal Text")]
parseRules "Normal" =
do (attr, result) <- (((pFirstNonSpace >> pDetectChar False '*' >>= withAttribute "Entry") >>~ pushContext "entry")
<|>
((pColumn 0 >> pRegExpr regex_'5cd'5cd'5cd'5cd'5cs'2a'2d'5cs'2a'5cd'5cd'5cs'2a'2d'5cs'2a'5cd'5cd'5cs'2a >>= withAttribute "Date") >>~ pushContext "line"))
return (attr, result)
parseRules "line" =
do (attr, result) <- (((pRegExpr regex_'28'5cw'5cs'2a'29'2b >>= withAttribute "Name"))
<|>
((pRegExpr regex_'3c'2e'2a'3e'5cs'2a'24 >>= withAttribute "E-Mail") >>~ (popContext)))
return (attr, result)
parseRules "entry" =
do (attr, result) <- ((pRegExpr regex_'2e'2a'3a >>= withAttribute "Entry") >>~ (popContext))
return (attr, result)
parseRules "" = parseRules "Normal"
parseRules x = fail $ "Unknown context" ++ x