module Text.Highlighting.Kate.Syntax.Asn1
(highlight, parseExpression, syntaxName, syntaxExtensions)
where
import Text.Highlighting.Kate.Types
import Text.Highlighting.Kate.Common
import Text.ParserCombinators.Parsec hiding (State)
import Control.Monad.State
import Data.Char (isSpace)
import qualified Data.Set as Set
syntaxName :: String
syntaxName = "ASN.1"
syntaxExtensions :: String
syntaxExtensions = "*.asn;*.asn1"
highlight :: String -> [SourceLine]
highlight input = evalState (mapM parseSourceLine $ lines input) startingState
parseSourceLine :: String -> State SyntaxState SourceLine
parseSourceLine = mkParseSourceLine (parseExpression Nothing)
parseExpression :: Maybe (String,String)
-> KateParser Token
parseExpression mbcontext = do
(lang,cont) <- maybe currentContext return mbcontext
result <- parseRules (lang,cont)
optional $ do eof
updateState $ \st -> st{ synStPrevChar = '\n' }
pEndLine
return result
startingState = SyntaxState {synStContexts = [("ASN.1","Normal Text")], synStLineNumber = 0, synStPrevChar = '\n', synStPrevNonspace = False, synStContinuation = False, synStCaseSensitive = True, synStKeywordCaseSensitive = True, synStCaptures = []}
pEndLine = do
updateState $ \st -> st{ synStPrevNonspace = False }
context <- currentContext
contexts <- synStContexts `fmap` getState
st <- getState
if length contexts >= 2
then case context of
_ | synStContinuation st -> updateState $ \st -> st{ synStContinuation = False }
("ASN.1","Normal Text") -> return ()
("ASN.1","Comment") -> (popContext) >> pEndLine
_ -> return ()
else return ()
withAttribute attr txt = do
when (null txt) $ fail "Parser matched no text"
updateState $ \st -> st { synStPrevChar = last txt
, synStPrevNonspace = synStPrevNonspace st || not (all isSpace txt) }
return (attr, txt)
list_keywords = Set.fromList $ words $ "DEFINITIONS BEGIN END EXPORTS IMPORTS FROM APPLICATION PRIVATE UNIVERSAL DEFAULT OPTIONAL FALSE TRUE"
list_types = Set.fromList $ words $ "BOOLEAN INTEGER OCTET STRING NULL REAL ENUMERATED SEQUENCE SET CHOICE OF VisibleString StringStore"
parseRules ("ASN.1","Normal Text") =
(((pKeyword " \n\t.():!+,-<=>%&*/;?[]^{|}~\\" list_keywords >>= withAttribute KeywordTok))
<|>
((pKeyword " \n\t.():!+,-<=>%&*/;?[]^{|}~\\" list_types >>= withAttribute DataTypeTok))
<|>
((pDetect2Chars False '-' '-' >>= withAttribute CommentTok) >>~ pushContext ("ASN.1","Comment"))
<|>
(currentContext >>= \x -> guard (x == ("ASN.1","Normal Text")) >> pDefault >>= withAttribute NormalTok))
parseRules ("ASN.1","Comment") =
(currentContext >>= \x -> guard (x == ("ASN.1","Comment")) >> pDefault >>= withAttribute CommentTok)
parseRules x = parseRules ("ASN.1","Normal Text") <|> fail ("Unknown context" ++ show x)