module Text.Highlighting.Kate.Syntax.Eiffel
(highlight, parseExpression, syntaxName, syntaxExtensions)
where
import Text.Highlighting.Kate.Types
import Text.Highlighting.Kate.Common
import Text.ParserCombinators.Parsec hiding (State)
import Data.Map (fromList)
import Control.Monad.State
import Data.Char (isSpace)
import Data.Maybe (fromMaybe)
import qualified Data.Set as Set
syntaxName :: String
syntaxName = "Eiffel"
syntaxExtensions :: String
syntaxExtensions = "*.e"
highlight :: String -> [SourceLine]
highlight input = evalState (mapM parseSourceLine $ lines input) startingState
parseSourceLine :: String -> State SyntaxState SourceLine
parseSourceLine = mkParseSourceLine parseExpressionInternal pEndLine
parseExpression :: KateParser Token
parseExpression = do
st <- getState
let oldLang = synStLanguage st
setState $ st { synStLanguage = "Eiffel" }
context <- currentContext <|> (pushContext "Normal" >> currentContext)
result <- parseRules context
optional $ eof >> pEndLine
updateState $ \st -> st { synStLanguage = oldLang }
return result
startingState = SyntaxState {synStContexts = fromList [("Eiffel",["Normal"])], synStLanguage = "Eiffel", synStLineNumber = 0, synStPrevChar = '\n', synStPrevNonspace = False, synStCaseSensitive = True, synStKeywordCaseSensitive = True, synStCaptures = []}
pEndLine = do
updateState $ \st -> st{ synStPrevNonspace = False }
context <- currentContext
case context of
"Normal" -> return ()
"Quoted String" -> (popContext) >> pEndLine
"Documentation" -> (popContext) >> pEndLine
_ -> 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)
parseExpressionInternal = do
context <- currentContext
parseRules context <|> (pDefault >>= withAttribute (fromMaybe NormalTok $ lookup context defaultAttributes))
list_keywords = Set.fromList $ words $ "agent alias all and as assign class convert create creation debug deferred do else elseif end expanded export external feature from frozen if implies indexing infix inherit inspect is like local loop not obsolete old once or prefix pure redefine reference rename rescue retry separate then undefine"
list_predefined'2dentities = Set.fromList $ words $ "Current False Precursor Result True TUPLE"
list_assertions = Set.fromList $ words $ "check ensure require variant invariant"
defaultAttributes = [("Normal",NormalTok),("Quoted String",StringTok),("Documentation",CommentTok)]
parseRules "Normal" =
(((pKeyword " \n\t.():!+,-<=>%&*/;?[]^{|}~\\" list_keywords >>= withAttribute KeywordTok))
<|>
((pKeyword " \n\t.():!+,-<=>%&*/;?[]^{|}~\\" list_predefined'2dentities >>= withAttribute OtherTok))
<|>
((pKeyword " \n\t.():!+,-<=>%&*/;?[]^{|}~\\" list_assertions >>= withAttribute OtherTok))
<|>
((pInt >>= withAttribute DecValTok))
<|>
((pFloat >>= withAttribute FloatTok))
<|>
((pHlCChar >>= withAttribute CharTok))
<|>
((pDetectChar False '"' >>= withAttribute StringTok) >>~ pushContext "Quoted String")
<|>
((pDetect2Chars False '-' '-' >>= withAttribute CommentTok) >>~ pushContext "Documentation"))
parseRules "Quoted String" =
((pDetectChar False '"' >>= withAttribute StringTok) >>~ (popContext))
parseRules "Documentation" =
pzero
parseRules "" = parseRules "Normal"
parseRules x = fail $ "Unknown context" ++ x