getTextStyle method

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

Implementation

TextStyle getTextStyle(String token , spans , lastToken){
  var keywords = [
    'break', 'default', 'func', 'interface', 'select', 'case', 'defer', 'go', 'map', 'struct', 'chan',
    'else', 'goto', 'package', 'switch', 'const', 'fallthrough', 'if', 'range', 'type', 'continue', 'for', 'import',
    'return', 'var'
  ]
  ;
  var specialIdentifiers = [
    'main' , 'nil' , 'true' , 'false'
  ];
  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])*"' + '|' + r"'(\\\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;
  }
}