mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/DiscussionTools
synced 2024-12-04 21:08:32 +00:00
25272e7a4a
These changes ensure that DiscussionTools is independent of DOM
library choice, and will not break if/when Parsoid switches to an
alternate (more standards-compliant) DOM library.
We run `phan` against the Dodo standards-compliant DOM library,
so this ends up flagging uses of non-standard PHP extensions to
the DOM. These will be suppressed for now with a "Nonstandard DOM"
comment that can be grepped for, since they will eventually
will need to be rewritten or worked around.
Most frequent issues:
* Node::nodeValue and Node::textContent and Element::getAttribute()
can return null in a spec-compliant implementation. Add `?? ''` to
make spec-compliant results consistent w/ what PHP returns.
* DOMXPath doesn't accept anything except DOMDocument. These uses
should be replaced with DOMCompat::querySelectorAll() or similar
(which end up using DOMXPath under the covers for DOMDocument any way,
but are implemented more efficiently in a spec-compliant
implementation).
* A couple of times we have code like:
`while ($node->firstChild!==null) { $node = $node->firstChild; }`
and phan's analysis isn't strong enough to determine that $node is still
non-null after the while. This same issue should appear with DOMDocument
but phan doesn't complain for some reason.
One apparently legit issue:
* Node::insertBefore() is once called in a funny way which leans on
the fact that the second option is optional in PHP. This seems to be
a workaround for an ancient PHP bug, and can probably be safely
removed.
Bug: T287611
Bug: T217867
Change-Id: I3c4f41c3819770f85d68157c9f690d650b7266a3
61 lines
1.5 KiB
PHP
61 lines
1.5 KiB
PHP
<?php
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namespace MediaWiki\Extension\DiscussionTools;
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use Exception;
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use Wikimedia\Parsoid\DOM\Node;
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/**
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* Partial implementation of W3 DOM4 NodeFilter interface.
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*
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* See also:
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* - https://dom.spec.whatwg.org/#interface-nodefilter
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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 NodeFilter {
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// Constants for acceptNode()
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public const FILTER_ACCEPT = 1;
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public const FILTER_REJECT = 2;
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public const FILTER_SKIP = 3;
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// Constants for whatToShow
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public const SHOW_ALL = 0xFFFFFFFF;
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public const SHOW_ELEMENT = 0x1;
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public const SHOW_ATTRIBUTE = 0x2;
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public const SHOW_TEXT = 0x4;
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public const SHOW_CDATA_SECTION = 0x8;
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public const SHOW_ENTITY_REFERENCE = 0x10;
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public const SHOW_ENTITY = 0x20;
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public const SHOW_PROCESSING_INSTRUCTION = 0x40;
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public const SHOW_COMMENT = 0x80;
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public const SHOW_DOCUMENT = 0x100;
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public const SHOW_DOCUMENT_TYPE = 0x200;
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public const SHOW_DOCUMENT_FRAGMENT = 0x400;
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public const SHOW_NOTATION = 0x800;
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public $filter;
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private $active = false;
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/**
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* See https://dom.spec.whatwg.org/#dom-nodefilter-acceptnode
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*
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* @param Node $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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public function acceptNode( $node ) {
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if ( $this->active ) {
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throw new Exception( 'DOMException: INVALID_STATE_ERR' );
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}
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$this->active = true;
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$result = call_user_func( $this->filter, $node );
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$this->active = false;
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return $result;
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}
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}
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