module Text.Highlighting.Kate.Syntax.Noweb ( highlight, parseExpression, syntaxName, syntaxExtensions ) where
import Text.Highlighting.Kate.Definitions
import Text.Highlighting.Kate.Common
import qualified Text.Highlighting.Kate.Syntax.Html
import qualified Text.Highlighting.Kate.Syntax.Cpp
import Text.ParserCombinators.Parsec
import Control.Monad (when)
import Data.Map (fromList)
import Data.Maybe (fromMaybe, maybeToList)
syntaxName :: String
syntaxName = "noweb"
syntaxExtensions :: String
syntaxExtensions = "*.w;*.nw"
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 = "noweb" }
context <- currentContext <|> (pushContext "RawDocumentation" >> 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 [("noweb",["RawDocumentation"])], synStLanguage = "noweb", 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
"RawDocumentation" -> return () >> pHandleEndLine
"CodeQuote" -> return () >> pHandleEndLine
"CodeSection" -> return () >> pHandleEndLine
"SectionNames" -> return () >> pHandleEndLine
_ -> 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 = [("Punctuation","re"),("SectionName","re")]
parseExpressionInternal = do
context <- currentContext
parseRules context <|> (pDefault >>= withAttribute (fromMaybe "" $ lookup context defaultAttributes))
regex_'3c'3c'2e'2a'3e'3e'3d'24 = compileRegex "<<.*>>=$"
regex_'5c'5d'5c'5d'28'3f'21'5c'5d'29 = compileRegex "\\]\\](?!\\])"
regex_'40'24 = compileRegex "@$"
regex_'40'28'3f'3d'5b'5cs'25'5d'29 = compileRegex "@(?=[\\s%])"
regex_'40'3c'3c = compileRegex "@<<"
regex_'3c'3c'2e'2a'5b'5e'40'5d'3e'3e'28'3f'21'3d'29 = compileRegex "<<.*[^@]>>(?!=)"
defaultAttributes = [("RawDocumentation","Prose"),("CodeQuote","Code"),("CodeSection","Code"),("SectionNames","Prose")]
parseRules "RawDocumentation" =
do (attr, result) <- (((pColumn 0 >> pRegExpr regex_'3c'3c'2e'2a'3e'3e'3d'24 >>= withAttribute "SectionName") >>~ pushContext "CodeSection")
<|>
((pDetect2Chars False '@' '[' >>= withAttribute "Prose"))
<|>
((pDetect2Chars False '[' '[' >>= withAttribute "Punctuation") >>~ pushContext "CodeQuote")
<|>
((Text.Highlighting.Kate.Syntax.Html.parseExpression)))
return (attr, result)
parseRules "CodeQuote" =
do (attr, result) <- (((pDetect2Chars False '@' ']' >>= withAttribute "Code"))
<|>
((pRegExpr regex_'5c'5d'5c'5d'28'3f'21'5c'5d'29 >>= withAttribute "Punctuation") >>~ (popContext))
<|>
((parseRules "SectionNames"))
<|>
((Text.Highlighting.Kate.Syntax.Cpp.parseExpression)))
return (attr, result)
parseRules "CodeSection" =
do (attr, result) <- (((pColumn 0 >> pRegExpr regex_'40'24 >>= withAttribute "Punctuation") >>~ pushContext "RawDocumentation")
<|>
((pColumn 0 >> pRegExpr regex_'40'28'3f'3d'5b'5cs'25'5d'29 >>= withAttribute "Punctuation") >>~ pushContext "RawDocumentation")
<|>
((pColumn 0 >> lookAhead (pRegExpr regex_'3c'3c'2e'2a'3e'3e'3d'24) >> return ([],"") ) >>~ pushContext "RawDocumentation")
<|>
((parseRules "SectionNames"))
<|>
((Text.Highlighting.Kate.Syntax.Cpp.parseExpression)))
return (attr, result)
parseRules "SectionNames" =
do (attr, result) <- (((pRegExpr regex_'40'3c'3c >>= withAttribute "Prose"))
<|>
((pRegExpr regex_'3c'3c'2e'2a'5b'5e'40'5d'3e'3e'28'3f'21'3d'29 >>= withAttribute "SectionName")))
return (attr, result)
parseRules "" = parseRules "RawDocumentation"
parseRules x = fail $ "Unknown context" ++ x