optimize method

@override void optimize()

Optimize this node within parent.

Subclasses should override this method to perform necessary optimizations.

Implementation

@override
void optimize() {
  if (isEmpty) {
    final sibling = previous;
    unlink();
    if (sibling != null) sibling.optimize();
    return;
  }

  BlockNode block = this;
  if (!block.isFirst && block.previous is BlockNode) {
    BlockNode prev = block.previous as BlockNode;
    if (prev.style == block.style) {
      block.moveChildren(prev);
      block.unlink();
      block = prev;
    }
  }
  if (!block.isLast && block.next is BlockNode) {
    BlockNode nextBlock = block.next as BlockNode;
    if (nextBlock.style == block.style) {
      nextBlock.moveChildren(block);
      nextBlock.unlink();
    }
  }
}