{- This module was generated from data in the Kate syntax
   highlighting file literate-haskell.xml, version 2.0.2, by Nicolas Wu (zenzike@gmail.com) -}

module Text.Highlighting.Kate.Syntax.LiterateHaskell
          (highlight, parseExpression, syntaxName, syntaxExtensions)
where
import Text.Highlighting.Kate.Types
import Text.Highlighting.Kate.Common
import qualified Text.Highlighting.Kate.Syntax.Haskell
import Text.ParserCombinators.Parsec hiding (State)
import Data.Map (fromList)
import Control.Monad.State
import Data.Char (isSpace)
import Data.Maybe (fromMaybe)

-- | Full name of language.
syntaxName :: String
syntaxName = "Literate Haskell"

-- | Filename extensions for this language.
syntaxExtensions :: String
syntaxExtensions = "*.lhs"

-- | Highlight source code using this syntax definition.
highlight :: String -> [SourceLine]
highlight input = evalState (mapM parseSourceLine $ lines input) startingState

parseSourceLine :: String -> State SyntaxState SourceLine
parseSourceLine = mkParseSourceLine parseExpressionInternal pEndLine

-- | Parse an expression using appropriate local context.
parseExpression :: KateParser Token
parseExpression = do
  st <- getState
  let oldLang = synStLanguage st
  setState $ st { synStLanguage = "Literate Haskell" }
  context <- currentContext <|> (pushContext "text" >> currentContext)
  result <- parseRules context
  optional $ eof >> pEndLine
  updateState $ \st -> st { synStLanguage = oldLang }
  return result

startingState = SyntaxState {synStContexts = fromList [("Literate Haskell",["text"])], synStLanguage = "Literate Haskell", synStLineNumber = 0, synStPrevChar = '\n', synStPrevNonspace = False, synStCaseSensitive = True, synStKeywordCaseSensitive = True, synStCaptures = []}

pEndLine = do
  updateState $ \st -> st{ synStPrevNonspace = False }
  context <- currentContext
  case context of
    "text" -> return ()
    "normal" -> (popContext) >> pEndLine
    "normals" -> return ()
    "comments'" -> pushContext "uncomments" >> return ()
    "uncomments" -> return ()
    "recomments" -> (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))


regex_'5c'7b'2d'5b'5e'23'5d = compileRegex "\\{-[^#]"

defaultAttributes = [("text",NormalTok),("normal",NormalTok),("normals",NormalTok),("comments'",CommentTok),("uncomments",NormalTok),("recomments",CommentTok)]

parseRules "text" =
  (((pColumn 0 >> pDetectChar False '>' >>= withAttribute OtherTok) >>~ pushContext "normal")
   <|>
   ((pColumn 0 >> pDetectChar False '<' >>= withAttribute OtherTok) >>~ pushContext "normal")
   <|>
   ((pString False "\\begin{code}" >>= withAttribute NormalTok) >>~ pushContext "normals")
   <|>
   ((pString False "\\begin{spec}" >>= withAttribute NormalTok) >>~ pushContext "normals"))

parseRules "normal" =
  (((pRegExpr regex_'5c'7b'2d'5b'5e'23'5d >>= withAttribute CommentTok) >>~ pushContext "comments'")
   <|>
   ((Text.Highlighting.Kate.Syntax.Haskell.parseExpression)))

parseRules "normals" =
  (((pString False "\\end{code}" >>= withAttribute NormalTok) >>~ (popContext))
   <|>
   ((pString False "\\end{spec}" >>= withAttribute NormalTok) >>~ (popContext))
   <|>
   ((Text.Highlighting.Kate.Syntax.Haskell.parseExpression)))

parseRules "comments'" =
  ((pDetect2Chars False '-' '}' >>= withAttribute CommentTok) >>~ (popContext))

parseRules "uncomments" =
  (((pColumn 0 >> pDetectChar False '>' >>= withAttribute OtherTok) >>~ pushContext "recomments")
   <|>
   ((pColumn 0 >> pDetectChar False '<' >>= withAttribute OtherTok) >>~ pushContext "recomments"))

parseRules "recomments" =
  ((pDetect2Chars False '-' '}' >>= withAttribute CommentTok) >>~ (popContext >> popContext >> popContext))

parseRules "" = parseRules "text"

parseRules x = fail $ "Unknown context" ++ x