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 Data.List (nub)
import Data.Map (fromList)
import Data.Maybe (fromMaybe)
syntaxName :: String
syntaxName = "AWK"
syntaxExtensions :: String
syntaxExtensions = "*.awk"
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 = "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, 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 }
withAttribute attr txt = do
if null txt
then fail "Parser matched no text"
else return ()
let style = fromMaybe "" $ lookup attr styles
st <- getState
let oldCharsParsed = synStCharsParsedInLine st
updateState $ \st -> st { synStCharsParsedInLine = oldCharsParsed + length txt }
return (nub [style, attr], txt)
styles = [("Normal","Normal"),("Keyword","Keyword"),("Builtin","DataType"),("Function","Function"),("Decimal","DecVal"),("Float","Float"),("String","String"),("Comment","Comment"),("Pattern","String"),("Field","Others")]
parseExpressionInternal = do
context <- currentContext
parseRules context <|> (pDefault >>= withAttribute (fromMaybe "" $ lookup context defaultAttributes))
defaultAttributes = [("Base","Normal"),("String","String"),("Comment","Comment")]
parseRules "Base" =
do (attr, result) <- (((pRegExpr (compileRegex "\\b(BEGIN|END)\\b") >>= withAttribute "Pattern"))
<|>
((pRegExpr (compileRegex "/([^\\/[]|\\\\.|\\[\\]?(\\[[^]]+\\]|.)+\\])+/") >>= 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.():!+,-<=>%&*/;?[]^{|}~\\" ["if","else","while","do","for","in","continue","break","print","printf","getline","function","return","next","exit"] >>= withAttribute "Keyword"))
<|>
((pKeyword " \n\t.():!+,-<=>%&*/;?[]^{|}~\\" ["ARGC","ARGV","CONVFMT","ENVIRON","FILENAME","FNR","FS","NF","NR","OFMT","OFS","ORS","RS","RSTART","RLENGTH","SUBSEP"] >>= withAttribute "Builtin"))
<|>
((pKeyword " \n\t.():!+,-<=>%&*/;?[]^{|}~\\" ["gsub","gensub","index","length","match","split","sprintf","sub","substr","tolower","toupper","atan2","cos","exp","int","log","rand","sin","sqrt","srand","close","fflush","system"] >>= withAttribute "Function"))
<|>
((pFloat >>= withAttribute "Float"))
<|>
((pInt >>= withAttribute "Decimal"))
<|>
((pRegExpr (compileRegex "\\$[A-Za-z0-9_]+") >>= 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