getTextStyle method

TextStyle getTextStyle(String token, dynamic spans, dynamic lastToken)

Implementation

TextStyle getTextStyle(String token , spans , lastToken){
  var keywords = [
    "if", "while",  "else" , "do" , "try", "finally",
    "return", "break", "continue", "new", "void", "throw", "yield",
     "var", "const",  "export", "typeof",
    "public" , "private", "protected",  "catch", "in", "of",
    "for", "switch", "case" , "default", "package", "NaN", "module",
    "interface", "undefined", "instanceof", "async", "await", "implements",
    "true", "false", "null", "delete", "function", "static",
    "this", "class", "super",
    "enum", "import", "extends",
    "let" , "debugger" , "with" , "true", "false", "null"
  ];
  var specialIdentifiers = ["override",'String',
    'Object' , 'console' ,
  ];
  var operators = ['+','-','*','/','%', '!', '?', ':', '^','&','|','=','<','>','>>', '>>>','<<','++','--','**','!=','<=','>=', '=>','+=','-=','*=','**=','==','===','!==','/=','%=','|=','&=','^=','>>=','<<=','&&','||'];
  var re = new RegExp(r'\w+');
  if(re.stringMatch(token) == token){
    if (keywords.contains(token)) {
      return theme.keyword;
    } else if (specialIdentifiers.contains(token))
      return theme.specialIdentifier;
    else if((new RegExp(r'\d+')).stringMatch(token) == token)
      return theme.numberConstant;
    return theme.identifier;
  }else{
    if((new RegExp(r'(//.*)|(/\*(.|\n)*?\*/)')).stringMatch(token) == token)
      return theme.comment;
    else if((new RegExp(r'''("(\\\n|\\"|[^"\n])*")|('(\\\n|\\'|[^'\n])*')|(`(.|\n)*?`)''')).stringMatch(token) == token)
      return theme.stringConstant;
    else if(operators.contains(token.trim()))
      return theme.operator;
    var lt = token.trimLeft();
    if(lt.length>0)
      if(lt[0]=="("  && (new RegExp(r'\w+')).stringMatch(lastToken) == lastToken && !(specialIdentifiers.contains(lastToken) || keywords.contains(lastToken))){//it is a function
        spans.removeAt(spans.length-1);
        spans.add(TextSpan(text: lastToken, style: theme.functionIdentifier));
      }
    return theme.specialCharacter;
  }
}