getTextStyle method

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

Implementation

TextStyle getTextStyle(String token , spans , lastToken){
  var keywords = [
    "if", "while",  "else" , "do" , "auto", "char",
    "return", "break", "continue", "extern", "void", "register", "short",
    "double", "sizeof", "const", "signed", "float", "long", "struct", "typedef",
    "union" ,  "catch", "int", "goto",
    "for", "switch", "case" , "default", "unsigned",
    "static", "volatile", "enum",
  ];
  var specialIdentifiers = [
    'main' , 'true' , 'false' , 'NULL' , 'include' , 'define' , 'ifdef' , 'undef' , 'ifndef' ,
    'if' , 'else' , 'elif' , 'endif' , 'error' , 'pragma'
  ];
  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)){
      if(lastToken.contains('#')){
        spans.removeAt(spans.length-1);
        spans.add(TextSpan(text: lastToken, style: theme.specialIdentifier));
      }
      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])*'")).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;
  }
}