static char getLimitingQuote(IElementType quotedToken) {
    if (quotedToken == CustomHighlighterTokenType.STRING) return '"';
    else if (quotedToken == CustomHighlighterTokenType.SINGLE_QUOTED_STRING ||
             quotedToken == CustomHighlighterTokenType.CHARACTER) {
      return '\'';
    }
    else return 0;
  }
static char getLimitingQuote(IElementType quotedToken)