replaceChild method

Implementation

@override
DartBlockValueTreeAlgebraicNode? replaceChild(
  DartBlockValueTreeAlgebraicNode oldChild,
  DartBlockValueTreeAlgebraicNode? newChild,
) {
  if (leftChild == oldChild) {
    leftChild = newChild;
    leftChild?.parent = this;
  } else if (rightChild == oldChild) {
    rightChild = newChild;
    rightChild?.parent = this;
  }
  if (leftChild == null) {
    if (operator != DartBlockAlgebraicOperator.subtract &&
        operator != DartBlockAlgebraicOperator.add) {
      operator = null;
      if (parent == null) {
        rightChild?.parent = null;

        return rightChild;
      } else {
        return parent?.replaceChild(this, rightChild);
      }
    }
  }
  if (rightChild == null && operator == null) {
    if (parent == null) {
      leftChild?.parent = null;

      return leftChild;
    } else {
      return parent?.replaceChild(this, leftChild);
    }
  }

  return this;
}