getTextStyle method

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

Implementation

TextStyle getTextStyle(String token , spans, lastToken){
  var keywords = [
    'abstract', 'else', 'import', 'super', 'as', 'enum', 'in', 'switch', 'assert', 'export', 'interface',
    'sync', 'async', 'extends', 'is', 'this', 'await', 'extension', 'library', 'throw', 'break', 'external',
    'mixin', 'true', 'case', 'factory', 'new', 'try', 'catch', 'false', 'null', 'typedef', 'class', 'final',
    'on', 'var', 'const', 'finally', 'operator', 'void', 'continue', 'for', 'part', 'while', 'covariant',
    'Function', 'rethrow', 'with', 'default', 'get', 'return', 'yield', 'deferred', 'hide', 'set', 'do',
    'if', 'show', 'dynamic', 'implements', 'static'
  ];
  var specialIdentifiers = ["main","override",'String', 'print' , 'readLineSync' , 'tryParse',
    'List' , 'Map' ,
  ];
  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'r?"(\\\n|\\"|[^"\n])*"' + '|' + r"r?'(\\\n|\\'|[^'\n])*'" + '|' + r'r?"""(.|\n)*?"""' + '|' + r"r?'''(.|\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;
  }
}