canEncode method

bool canEncode(String contents, Charset charset, int position)

Implementation

bool canEncode(String contents, Charset charset, int position) {
  final c = contents.codeUnitAt(position);

  switch (charset) {
    case Charset.A:
      return c == Code128Writer._escapeFnc1 ||
          c == Code128Writer._escapeFnc2 ||
          c == Code128Writer._escapeFnc3 ||
          c == Code128Writer._escapeFnc4 ||
          A.contains(c);
    case Charset.B:
      return c == Code128Writer._escapeFnc1 ||
          c == Code128Writer._escapeFnc2 ||
          c == Code128Writer._escapeFnc3 ||
          c == Code128Writer._escapeFnc4 ||
          B.contains(c);
    case Charset.C:
      return c == Code128Writer._escapeFnc1 ||
          (position + 1 < contents.length &&
              isDigit(c) &&
              isDigit(contents.codeUnitAt(position + 1)));
    default:
      return false;
  }
}