toString method

String toString()

Emmulate GNU diff's format.

Header: @@ -382,8 +481,9 @@

Indicies are printed as 1-based, not 0-based. Returns the GNU diff string.

Implementation

String toString() {
  String coords1, coords2;
  if (this.length1 == 0) {
    coords1 = '${this.start1},0';
  } else if (this.length1 == 1) {
    coords1 = (this.start1 + 1).toString();
  } else {
    coords1 = '${this.start1 + 1},${this.length1}';
  }
  if (this.length2 == 0) {
    coords2 = '${this.start2},0';
  } else if (this.length2 == 1) {
    coords2 = (this.start2 + 1).toString();
  } else {
    coords2 = '${this.start2 + 1},${this.length2}';
  }
  final text = new StringBuffer('@@ -$coords1 +$coords2 @@\n');
  // Escape the body of the patch with %xx notation.
  for (Diff aDiff in this.diffs) {
    switch (aDiff.operation) {
    case DIFF_INSERT:
      text.write('+');
      break;
    case DIFF_DELETE:
      text.write('-');
      break;
    case DIFF_EQUAL:
      text.write(' ');
      break;
    }
    text
    ..write(Uri.encodeFull(aDiff.text))
    ..write('\n');
  }
  return text.toString().replaceAll('%20', ' ');
}