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57 lines
2.1 KiB
57 lines
2.1 KiB
<?php
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/**
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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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*/
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declare(strict_types=1);
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namespace MensBeam\HTML\DOM;
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use MensBeam\Framework\MagicProperties;
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trait ParentNode {
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/**
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* Generator which walks down the DOM from the node the method is being run on.
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* Non-standard.
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*
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* @param ?\Closure $filter An optional callback function used to filter; if not provided the generator will
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* just yield every node.
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* @param bool $includeReferenceNode An optional boolean flag which if true includes the reference node ($this) in
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* the iteration.
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*/
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public function walk(?\Closure $filter = null, bool $includeReferenceNode = false): \Generator {
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$node = ($includeReferenceNode && !$this instanceof DocumentFragment) ? $this : $this->firstChild;
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if ($node !== null) {
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do {
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$next = $node->nextSibling;
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$result = ($filter === null) ? true : $filter($node);
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// Have to do type checking here because PHP is lacking in advanced typing
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if ($result !== true && $result !== false && $result !== null) {
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$type = gettype($result);
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if ($type === 'object') {
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$type = get_class($result);
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}
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throw new Exception(Exception::RETURN_TYPE_ERROR, 'Closure', '?bool', $type);
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}
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if ($result === true) {
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yield $node;
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}
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// If the filter returns true (accept) or false (skip) and the node wasn't
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// removed in the filter iterate through the children
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if ($result !== null && $node->parentNode !== null) {
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if ($node instanceof HTMLTemplateElement) {
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$node = $node->content;
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}
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if ($node->hasChildNodes()) {
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yield from $node->walk($filter);
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}
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}
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} while ($node = $next);
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}
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}
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}
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