module Text.Highlighting.Kate.Syntax.Go ( 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 Control.Monad (when)
import Data.Map (fromList)
import Data.Maybe (fromMaybe, maybeToList)
import qualified Data.Set as Set
syntaxName :: String
syntaxName = "Go"
syntaxExtensions :: String
syntaxExtensions = "*.go"
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 = "Go" }
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 [("Go",["normal"])], synStLanguage = "Go", 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
"Commentar 1" -> (popContext) >> pEndLine
"Commentar 2" -> return () >> pHandleEndLine
"Package" -> (popContext) >> pEndLine
"String" -> (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 = [("Keyword","kw"),("Special","ot"),("Type","dt"),("Builtin","ot"),("String Char","ch"),("String","st"),("Comment","co"),("Char","ch")]
parseExpressionInternal = do
context <- currentContext
parseRules context <|> (pDefault >>= withAttribute (fromMaybe "" $ lookup context defaultAttributes))
list_keywords = Set.fromList $ words $ "break case chan const continue default defer else fallthrough for func go goto if import interface map range return select struct switch type var"
list_types = Set.fromList $ words $ "bool byte complex64 complex128 float float32 float64 int int8 int16 int32 int64 string uint uint8 uint16 uint32 uint64"
list_builtin = Set.fromList $ words $ "cap len make new panic recover"
list_special = Set.fromList $ words $ "false nil true"
defaultAttributes = [("normal","Normal Text"),("Commentar 1","Comment"),("Commentar 2","Comment"),("Package","Package"),("String","String")]
parseRules "normal" =
do (attr, result) <- (((pKeyword " \n\t.():!+,-<=>%&*/;?[]^{|}~\\" list_keywords >>= withAttribute "Keyword"))
<|>
((pKeyword " \n\t.():!+,-<=>%&*/;?[]^{|}~\\" list_special >>= withAttribute "Special"))
<|>
((pKeyword " \n\t.():!+,-<=>%&*/;?[]^{|}~\\" list_types >>= withAttribute "Type"))
<|>
((pKeyword " \n\t.():!+,-<=>%&*/;?[]^{|}~\\" list_builtin >>= withAttribute "Builtin"))
<|>
((pString False "package" >>= withAttribute "Package") >>~ pushContext "Package")
<|>
((pDetectChar False '{' >>= withAttribute "Symbol"))
<|>
((pDetectChar False '}' >>= withAttribute "Symbol"))
<|>
((pDetect2Chars False '/' '/' >>= withAttribute "Comment") >>~ pushContext "Commentar 1")
<|>
((pDetect2Chars False '/' '*' >>= withAttribute "Comment") >>~ pushContext "Commentar 2")
<|>
((pHlCChar >>= withAttribute "Char"))
<|>
((pDetectChar False '"' >>= withAttribute "String") >>~ pushContext "String"))
return (attr, result)
parseRules "Commentar 1" =
do (attr, result) <- (((pLineContinue >>= withAttribute "Comment"))
<|>
((pDetectSpaces >>= withAttribute "Comment"))
<|>
((Text.Highlighting.Kate.Syntax.Alert.parseExpression))
<|>
((pDetectIdentifier >>= withAttribute "Comment")))
return (attr, result)
parseRules "Commentar 2" =
do (attr, result) <- (((pDetectSpaces >>= withAttribute "Comment"))
<|>
((pDetect2Chars False '*' '/' >>= withAttribute "Comment") >>~ (popContext))
<|>
((Text.Highlighting.Kate.Syntax.Alert.parseExpression))
<|>
((pDetectIdentifier >>= withAttribute "Comment")))
return (attr, result)
parseRules "Package" =
pzero
parseRules "String" =
do (attr, result) <- (((pLineContinue >>= withAttribute "String"))
<|>
((pHlCStringChar >>= withAttribute "String Char"))
<|>
((pDetectChar False '"' >>= withAttribute "String") >>~ (popContext)))
return (attr, result)
parseRules x = fail $ "Unknown context" ++ x