module Text.Highlighting.Kate.Syntax.Modula2 ( highlight, parseExpression, syntaxName, syntaxExtensions ) where
import Text.Highlighting.Kate.Definitions
import Text.Highlighting.Kate.Common
import Text.ParserCombinators.Parsec
import Control.Monad (when)
import Data.Map (fromList)
import Data.Maybe (fromMaybe, maybeToList)
import qualified Data.Set as Set
syntaxName :: String
syntaxName = "Modula-2"
syntaxExtensions :: String
syntaxExtensions = "*.mod;*.def;*.mi;*.md"
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 = "Modula-2" }
context <- currentContext <|> (pushContext "Normal" >> 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 [("Modula-2",["Normal"])], synStLanguage = "Modula-2", 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
"Normal" -> return () >> pHandleEndLine
"String1" -> (popContext) >> pEndLine
"String2" -> (popContext) >> pEndLine
"Comment2" -> return () >> pHandleEndLine
"Comment3" -> (popContext) >> pEndLine
"Prep1" -> 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 = [("Keyword","kw"),("Type","dt"),("Number","dv"),("String","st"),("Directive","ot"),("Comment","co")]
parseExpressionInternal = do
context <- currentContext
parseRules context <|> (pDefault >>= withAttribute (fromMaybe "" $ lookup context defaultAttributes))
list_directives = Set.fromList $ words $ "ASSEMBLER ALLOCATE DEALLOCATE SIZE Write WriteString WriteCard WriteLn WriteBf WriteInt WriteReal WriteLongReal Read ReadString ReadCard ReadInt ReadReal ReadLongReal Open Close OpenInput OpenOutput Accessible Erase EOF Done EmptyString Assign Append Length StrEq Copy Concat pos Delete Insert compare CAPS PutBf GetArgs GetEnv ResetClock UserTime SystemTime GetChar GetInt GetCard GetString GetReal GetLongReal PutChar PutInt PutCard PutString PutReal PutLongReal PutLn"
list_keywords = Set.fromList $ words $ "AND ARRAY ASM BEGIN CASE CONST DIV DO ELSE ELSIF END FOR IF IMPLEMENTATION IN SET INCL EXCL ABS BITSET CAP CHR DEC HALT HIGH INC MAX MIN ODD ORD PROC TRUNC VAL MOD NIL NOT OF OR PROCEDURE MODULE DEFINITION RECORD REPEAT THEN TO TYPE UNTIL LOOP VAR WHILE WITH EXIT FALSE TRUE BY FROM IMPORT EXPORT QUALIFIED RETURN NEWPROCESS TRANSFER IOTRANSFER FOREIGN"
list_types = Set.fromList $ words $ "INTEGER CARDINAL SHORTINT SHORTCARD LONGINT LONGREAL CHAR BOOLEAN POINTER ADDRESS ADR REAL File"
defaultAttributes = [("Normal","Normal Text"),("String1","String"),("String2","String"),("Comment2","Comment"),("Comment3","Comment"),("Prep1","Directive")]
parseRules "Normal" =
do (attr, result) <- (((pKeyword " \n\t.():!+,-<=>%&*/;?[]^{|}~\\" list_keywords >>= withAttribute "Keyword"))
<|>
((pKeyword " \n\t.():!+,-<=>%&*/;?[]^{|}~\\" list_directives >>= withAttribute "Directive"))
<|>
((pKeyword " \n\t.():!+,-<=>%&*/;?[]^{|}~\\" list_types >>= withAttribute "Type"))
<|>
((pFloat >>= withAttribute "Number"))
<|>
((pInt >>= withAttribute "Number"))
<|>
((pDetectChar False '"' >>= withAttribute "String") >>~ pushContext "String1")
<|>
((pDetectChar False '\'' >>= withAttribute "String") >>~ pushContext "String2")
<|>
((pString False "(*$" >>= withAttribute "Directive") >>~ pushContext "Prep1")
<|>
((pDetect2Chars False '(' '*' >>= withAttribute "Comment") >>~ pushContext "Comment2"))
return (attr, result)
parseRules "String1" =
do (attr, result) <- ((pDetectChar False '"' >>= withAttribute "String") >>~ (popContext))
return (attr, result)
parseRules "String2" =
do (attr, result) <- ((pDetectChar False '\'' >>= withAttribute "String") >>~ (popContext))
return (attr, result)
parseRules "Comment2" =
do (attr, result) <- ((pDetect2Chars False '*' ')' >>= withAttribute "Comment") >>~ (popContext))
return (attr, result)
parseRules "Comment3" =
pzero
parseRules "Prep1" =
do (attr, result) <- ((pString False "$*)" >>= withAttribute "Directive") >>~ pushContext "Prep1")
return (attr, result)
parseRules x = fail $ "Unknown context" ++ x