toString method

@override String toString()

A string representation of this object.

Some classes have a default textual representation, often paired with a static parse function (like int.parse). These classes will provide the textual representation as their string representation.

Other classes have no meaningful textual representation that a program will care about. Such classes will typically override toString to provide useful information when inspecting the object, mainly for debugging or logging.

Implementation

@override
String toString() {
  if (source is String) {
    final s = source as String;
    if (pos >= s.length) {
      return '$pos:';
    }

    var length = s.length - pos;
    length = length > 40 ? 40 : length;
    final string = s.substring(pos, pos + length);
    return '$pos:$string';
  } else {
    return super.toString();
  }
}