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<title>[58893] trunk: HTML API: Only stop on full matches for requested tag name.</title>
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<dt style="float: left; width: 6em; font-weight: bold">Revision</dt> <dd><a style="font-weight: bold" href="https://core.trac.wordpress.org/changeset/58893">58893</a><script type="application/ld+json">{"@context":"http://schema.org","@type":"EmailMessage","description":"Review this Commit","action":{"@type":"ViewAction","url":"https://core.trac.wordpress.org/changeset/58893","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>dmsnell</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2024-08-13 22:12:01 +0000 (Tue, 13 Aug 2024)</dd>
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<pre style='padding-left: 1em; margin: 2em 0; border-left: 2px solid #ccc; line-height: 1.25; font-size: 105%; font-family: sans-serif'>HTML API: Only stop on full matches for requested tag name.
An optimization pass on the HTML API left a bug in the `matches()`
method, whereby it would falsely detect a tag name match if the
found tag were a lexical subset of the requested tag. This occurred
because of the use of `substr_compare()` without checking that the
outer lengths matched.
This patch resolves the bug by adding the length check.
Developed in https://github.com/wordpress/wordpress-develop/pull/7189
Discussed in https://core.trac.wordpress.org/ticket/61545
Follow-up to <a href="https://core.trac.wordpress.org/changeset/58613">[58613]</a>.
Props dmsnell, westonruter.
See <a href="https://core.trac.wordpress.org/ticket/61545">#61545</a>.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpincludeshtmlapiclasswphtmltagprocessorphp">trunk/src/wp-includes/html-api/class-wp-html-tag-processor.php</a></li>
<li><a href="#trunktestsphpunittestshtmlapiwpHtmlTagProcessorphp">trunk/tests/phpunit/tests/html-api/wpHtmlTagProcessor.php</a></li>
</ul>
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<h3>Diff</h3>
<a id="trunksrcwpincludeshtmlapiclasswphtmltagprocessorphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-includes/html-api/class-wp-html-tag-processor.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/html-api/class-wp-html-tag-processor.php 2024-08-13 21:42:07 UTC (rev 58892)
+++ trunk/src/wp-includes/html-api/class-wp-html-tag-processor.php 2024-08-13 22:12:01 UTC (rev 58893)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -4009,7 +4009,13 @@
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px">
</span><span class="cx" style="display: block; padding: 0 10px"> // Does the tag name match the requested tag name in a case-insensitive manner?
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- if ( isset( $this->sought_tag_name ) && 0 !== substr_compare( $this->html, $this->sought_tag_name, $this->tag_name_starts_at, $this->tag_name_length, true ) ) {
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ if (
+ isset( $this->sought_tag_name ) &&
+ (
+ strlen( $this->sought_tag_name ) !== $this->tag_name_length ||
+ 0 !== substr_compare( $this->html, $this->sought_tag_name, $this->tag_name_starts_at, $this->tag_name_length, true )
+ )
+ ) {
</ins><span class="cx" style="display: block; padding: 0 10px"> return false;
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px">
</span></span></pre></div>
<a id="trunktestsphpunittestshtmlapiwpHtmlTagProcessorphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/tests/phpunit/tests/html-api/wpHtmlTagProcessor.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tests/phpunit/tests/html-api/wpHtmlTagProcessor.php 2024-08-13 21:42:07 UTC (rev 58892)
+++ trunk/tests/phpunit/tests/html-api/wpHtmlTagProcessor.php 2024-08-13 22:12:01 UTC (rev 58893)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -602,6 +602,31 @@
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px">
</span><span class="cx" style="display: block; padding: 0 10px"> /**
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ * @ticket 61545
+ */
+ public function test_next_tag_should_not_match_on_substrings_of_a_requested_tag() {
+ $processor = new WP_HTML_Tag_Processor( '<p><pic><picture>' );
+
+ $this->assertTrue(
+ $processor->next_tag( 'PICTURE' ),
+ 'Failed to find a tag when requested: check test setup.'
+ );
+
+ $this->assertSame(
+ 'PICTURE',
+ $processor->get_tag(),
+ 'Should have skipped past substring tag matches, directly finding the PICTURE element.'
+ );
+
+ $processor = new WP_HTML_Tag_Processor( '<p><pic>' );
+
+ $this->assertFalse(
+ $processor->next_tag( 'PICTURE' ),
+ "Should not have found any PICTURE element, but found '{$processor->get_token_name()}' instead."
+ );
+ }
+
+ /**
</ins><span class="cx" style="display: block; padding: 0 10px"> * @ticket 59209
</span><span class="cx" style="display: block; padding: 0 10px"> *
</span><span class="cx" style="display: block; padding: 0 10px"> * @covers WP_HTML_Tag_Processor::next_tag
</span></span></pre>
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