final public function getDiff()

in src/Diff.php [66:103]

• 33 lines of code
• 5 McCabe index (conditional complexity)

  final public function getDiff(): vec<DiffOp<this::TContent>> {
    $a = $this->a;
    $b = $this->b;

    $moves = Vec\reverse($this->getMoves());
    $diff = vec[];

    $prev = tuple(0, 0);
    foreach ($moves as list($from, $to)) {
      invariant($from === $prev, 'Missed a step');
      list($x, $y) = $from;
      $prev = $to;
      if ($to === tuple($x + 1, $y + 1)) {
        $diff[] =
          new DiffKeepOp($a[$x]['pos'], $b[$y]['pos'], $a[$x]['content']);
        continue;
      }

      if ($to === tuple($x + 1, $y)) {
        $diff[] = new DiffDeleteOp($a[$x]['pos'], $a[$x]['content']);
        continue;
      }

      if ($to === tuple($x, $y + 1)) {
        $diff[] = new DiffInsertOp($b[$y]['pos'], $b[$y]['content']);
        continue;
      }

      invariant_violation(
        'invalid move: (%d, %d) => (%d, %d)',
        $from[0],
        $from[1],
        $to[0],
        $to[1],
      );
    }
    return $diff;
  }