{- This module was generated from data in the Kate syntax highlighting file awk.xml, version 0.90,
   by   -}

module Text.Highlighting.Kate.Syntax.Awk ( 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
-- | Full name of language.
syntaxName :: String
syntaxName = "AWK"

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

-- | Highlight source code using this syntax definition.
highlight :: String -> Either String [SourceLine]
highlight input =
  case runParser parseSource startingState "source" input of
    Left err     -> Left $ show err
    Right result -> Right result

-- | Parse an expression using appropriate local context.
parseExpression :: GenParser Char SyntaxState LabeledSource
parseExpression = do
  st <- getState
  let oldLang = synStLanguage st
  setState $ st { synStLanguage = "AWK" }
  context <- currentContext <|> (pushContext "Base" >> 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 [("AWK",["Base"])], synStLanguage = "AWK", synStCurrentLine = "", synStCharsParsedInLine = 0, synStPrevChar = '\n', synStCaseSensitive = True, synStKeywordCaseSensitive = True, synStCaptures = []}

parseSourceLine = manyTill parseExpressionInternal pEndLine

pEndLine = do
  newline <|> (eof >> return '\n')
  context <- currentContext
  case context of
    "Base" -> return ()
    "String" -> return ()
    "Comment" -> (popContext >> return ())
    _ -> return ()
  lineContents <- lookAhead wholeLine
  updateState $ \st -> st { synStCurrentLine = lineContents, synStCharsParsedInLine = 0, synStPrevChar = '\n' }

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"),("Builtin","dt"),("Function","fu"),("Decimal","dv"),("Float","fl"),("String","st"),("Comment","co"),("Pattern","st"),("Field","ot")]

parseExpressionInternal = do
  context <- currentContext
  parseRules context <|> (pDefault >>= withAttribute (fromMaybe "" $ lookup context defaultAttributes))

list_keywords = Set.fromList $ words $ "if else while do for in continue break print printf getline function return next exit"
list_builtins = Set.fromList $ words $ "ARGC ARGV CONVFMT ENVIRON FILENAME FNR FS NF NR OFMT OFS ORS RS RSTART RLENGTH SUBSEP"
list_functions = Set.fromList $ words $ "gsub gensub index length match split sprintf sub substr tolower toupper atan2 cos exp int log rand sin sqrt srand close fflush system"

regex_'5cb'28BEGIN'7cEND'29'5cb = compileRegex "\\b(BEGIN|END)\\b"
regex_'2f'28'5b'5e'5c'2f'5b'5d'7c'5c'5c'2e'7c'5c'5b'5c'5d'3f'28'5c'5b'5b'5e'5d'5d'2b'5c'5d'7c'2e'29'2b'5c'5d'29'2b'2f = compileRegex "/([^\\/[]|\\\\.|\\[\\]?(\\[[^]]+\\]|.)+\\])+/"
regex_'5c'24'5bA'2dZa'2dz0'2d9'5f'5d'2b = compileRegex "\\$[A-Za-z0-9_]+"

defaultAttributes = [("Base","Normal"),("String","String"),("Comment","Comment")]

parseRules "Base" = 
  do (attr, result) <- (((pRegExpr regex_'5cb'28BEGIN'7cEND'29'5cb >>= withAttribute "Pattern"))
                        <|>
                        ((pRegExpr regex_'2f'28'5b'5e'5c'2f'5b'5d'7c'5c'5c'2e'7c'5c'5b'5c'5d'3f'28'5c'5b'5b'5e'5d'5d'2b'5c'5d'7c'2e'29'2b'5c'5d'29'2b'2f >>= withAttribute "Pattern"))
                        <|>
                        ((pDetectChar False '{' >>= withAttribute "Keyword"))
                        <|>
                        ((pDetectChar False '}' >>= withAttribute "Keyword"))
                        <|>
                        ((pDetectChar False '#' >>= withAttribute "Comment") >>~ pushContext "Comment")
                        <|>
                        ((pDetectChar False '"' >>= withAttribute "String") >>~ pushContext "String")
                        <|>
                        ((pKeyword " \n\t.():!+,-<=>%&*/;?[]^{|}~\\" list_keywords >>= withAttribute "Keyword"))
                        <|>
                        ((pKeyword " \n\t.():!+,-<=>%&*/;?[]^{|}~\\" list_builtins >>= withAttribute "Builtin"))
                        <|>
                        ((pKeyword " \n\t.():!+,-<=>%&*/;?[]^{|}~\\" list_functions >>= withAttribute "Function"))
                        <|>
                        ((pFloat >>= withAttribute "Float"))
                        <|>
                        ((pInt >>= withAttribute "Decimal"))
                        <|>
                        ((pRegExpr regex_'5c'24'5bA'2dZa'2dz0'2d9'5f'5d'2b >>= withAttribute "Field")))
     return (attr, result)

parseRules "String" = 
  do (attr, result) <- (((pDetectChar False '"' >>= withAttribute "String") >>~ (popContext >> return ()))
                        <|>
                        ((pHlCStringChar >>= withAttribute "String")))
     return (attr, result)

parseRules "Comment" = 
  do (attr, result) <- ((Text.Highlighting.Kate.Syntax.Alert.parseExpression >>= ((withAttribute "") . snd)))
     return (attr, result)

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