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40 lines
1.5 KiB
40 lines
1.5 KiB
<?php
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/** @license MIT
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* Copyright 2017 , Dustin Wilson, J. King et al.
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* See LICENSE and AUTHORS files for details */
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declare(strict_types=1);
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namespace MensBeam\HTML;
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trait Moonwalk {
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/** Generator which walks up the DOM. Nonstandard. */
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public function moonwalk(?\Closure $filter = null): \Generator {
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return $this->moonwalkGenerator($this, $filter);
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}
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private function moonwalkGenerator(\DOMNode $node, ?\Closure $filter = null) {
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do {
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while (true) {
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if ($filter === null || $filter($node)) {
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yield $node;
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}
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// If node is an instance of DocumentFragment then it might be the content
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// fragment of a template element, so iterate through all template elements
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// stored in the element map and see if node is the fragment of one of the
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// templates; if it is change node to the template element and reprocess. Magic!
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// Can walk backwards THROUGH templates!
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if ($node instanceof DocumentFragment) {
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foreach (ElementMap::getIterator() as $element) {
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if ($element->ownerDocument->isSameNode($node->ownerDocument) && $element instanceof TemplateElement && $element->content->isSameNode($node)) {
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$node = $element;
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continue;
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}
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}
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}
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break;
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}
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} while ($node = $node->parentNode);
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}
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}
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