mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/DiscussionTools
synced 2024-11-13 18:37:07 +00:00
308c2747b0
This is similar to what the JS version does. The TreeWalker and NodeFilter classes are adapted from https://github.com/Krinkle/dom-TreeWalker-polyfill (MIT license). This makes #getComments twice as fast on en-big-oldparser.html Change-Id: I2441f33e6e7bad753ac830d277e6a2e81ee8c93d
134 lines
3.2 KiB
PHP
134 lines
3.2 KiB
PHP
<?php
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namespace MediaWiki\Extension\DiscussionTools;
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use DOMNode;
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use Exception;
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/**
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* Partial implementation of W3 DOM4 TreeWalker interface.
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*
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* See also:
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* - https://dom.spec.whatwg.org/#interface-treewalker
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*
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* Adapted from https://github.com/Krinkle/dom-TreeWalker-polyfill/blob/master/src/TreeWalker-polyfill.js
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*/
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class TreeWalker {
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public $root;
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public $whatToShow;
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public $currentNode;
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public $filter;
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/**
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* See https://dom.spec.whatwg.org/#concept-node-filter
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*
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* @param TreeWalker $tw
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* @param DOMNode $node
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* @return int Constant NodeFilter::FILTER_ACCEPT,
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* NodeFilter::FILTER_REJECT or NodeFilter::FILTER_SKIP.
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*/
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private function nodeFilter( TreeWalker $tw, DOMNode $node ) {
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// Maps nodeType to whatToShow
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if ( !( ( ( 1 << ( $node->nodeType - 1 ) ) & $tw->whatToShow ) ) ) {
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return NodeFilter::FILTER_SKIP;
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}
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if ( $tw->filter === null ) {
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return NodeFilter::FILTER_ACCEPT;
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}
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return $tw->filter->acceptNode( $node );
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}
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/**
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* Based on WebKit's NodeTraversal::nextSkippingChildren
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* https://trac.webkit.org/browser/trunk/Source/WebCore/dom/NodeTraversal.h?rev=137221#L103
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*
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* @param DOMNode $node
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* @param DOMNode $stayWithin
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* @return DOMNode|null
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*/
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private function nextSkippingChildren( DOMNode $node, DOMNode $stayWithin ) : ?DOMNode {
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if ( $node === $stayWithin ) {
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return null;
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}
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if ( $node->nextSibling !== null ) {
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return $node->nextSibling;
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}
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/**
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* Based on WebKit's NodeTraversal::nextAncestorSibling
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* https://trac.webkit.org/browser/trunk/Source/WebCore/dom/NodeTraversal.cpp?rev=137221#L43
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*/
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while ( $node->parentNode !== null ) {
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$node = $node->parentNode;
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if ( $node === $stayWithin ) {
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return null;
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}
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if ( $node->nextSibling !== null ) {
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return $node->nextSibling;
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}
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}
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return null;
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}
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/**
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* See https://dom.spec.whatwg.org/#interface-treewalker
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*
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* @param DOMNode $root
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* @param int|null $whatToShow
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* @param callable|null $filter
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* @throws Exception
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*/
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public function __construct( DOMNode $root, $whatToShow = null, callable $filter = null ) {
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if ( !$root->nodeType ) {
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throw new Exception( 'DOMException: NOT_SUPPORTED_ERR' );
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}
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$this->root = $root;
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$this->whatToShow = (int)$whatToShow ?: 0;
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$this->currentNode = $root;
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if ( !$filter ) {
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$this->filter = null;
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} else {
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$this->filter = new NodeFilter();
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$this->filter->filter = $filter;
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}
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}
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/**
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* See https://dom.spec.whatwg.org/#dom-treewalker-nextnode
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*
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* @return DOMNode|null The current node
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*/
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public function nextNode() : ?DOMNode {
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$node = $this->currentNode;
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$result = NodeFilter::FILTER_ACCEPT;
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while ( true ) {
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while ( $result !== NodeFilter::FILTER_REJECT && $node->firstChild !== null ) {
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$node = $node->firstChild;
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$result = $this->nodeFilter( $this, $node );
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if ( $result === NodeFilter::FILTER_ACCEPT ) {
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$this->currentNode = $node;
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return $node;
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}
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}
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$following = $this->nextSkippingChildren( $node, $this->root );
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if ( $following !== null ) {
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$node = $following;
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} else {
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return null;
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}
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$result = $this->nodeFilter( $this, $node );
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if ( $result === NodeFilter::FILTER_ACCEPT ) {
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$this->currentNode = $node;
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return $node;
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}
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}
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}
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}
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