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<?php /** * @package dompdf * @link https://github.com/dompdf/dompdf * @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License */ namespace Dompdf\Frame; use Iterator; use Dompdf\Frame; /** * Pre-order Iterator * * Returns frames in preorder traversal order (parent then children) * * @package dompdf */ class FrameTreeIterator implements Iterator { /** * @var Frame */ protected $_root; /** * @var Frame[] */ protected $_stack = []; /** * @var int */ protected $_num; /** * @param Frame $root */ public function __construct(Frame $root) { $this->_stack[] = $this->_root = $root; $this->_num = 0; } public function rewind(): void { $this->_stack = [$this->_root]; $this->_num = 0; } /** * @return bool */ public function valid(): bool { return count($this->_stack) > 0; } /** * @return int */ public function key(): int { return $this->_num; } /** * @return Frame */ public function current(): Frame { return end($this->_stack); } public function next(): void { $b = array_pop($this->_stack); $this->_num++; // Push all children onto the stack in reverse order if ($c = $b->get_last_child()) { $this->_stack[] = $c; while ($c = $c->get_prev_sibling()) { $this->_stack[] = $c; } } } }
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