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<title>[59285] trunk: HTML API: Fix extensibility of `WP_HTML_Processor::next_token()`.</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/59285">59285</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/59285","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>westonruter</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2024-10-23 22:03:23 +0000 (Wed, 23 Oct 2024)</dd>
</dl>
<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: Fix extensibility of `WP_HTML_Processor::next_token()`.
Break out logic from the `next_token()` method into a private method which may call itself recursively. This allows for subclasses to override the `next_token()` method and be assured that each call to `next_token()` corresponds with the consumption of one single token. This also parallels how `WP_HTML_Tag_Processor::next_token()` wraps a private `base_class_next_token()` method.
Props westonruter, jonsurrell.
Fixes <a href="https://core.trac.wordpress.org/ticket/62269">#62269</a>.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpincludeshtmlapiclasswphtmlprocessorphp">trunk/src/wp-includes/html-api/class-wp-html-processor.php</a></li>
<li><a href="#trunktestsphpunittestshtmlapiwpHtmlProcessorphp">trunk/tests/phpunit/tests/html-api/wpHtmlProcessor.php</a></li>
</ul>
<h3>Added Paths</h3>
<ul>
<li>trunk/tests/phpunit/data/html-api/</li>
<li><a href="#trunktestsphpunitdatahtmlapihtmlxpathgeneratingprocessorphp">trunk/tests/phpunit/data/html-api/html-xpath-generating-processor.php</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunksrcwpincludeshtmlapiclasswphtmlprocessorphp"></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-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-processor.php 2024-10-23 18:29:32 UTC (rev 59284)
+++ trunk/src/wp-includes/html-api/class-wp-html-processor.php 2024-10-23 22:03:23 UTC (rev 59285)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -604,6 +604,22 @@
</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">+ * Finds the next token in the HTML document.
+ *
+ * This doesn't currently have a way to represent non-tags and doesn't process
+ * semantic rules for text nodes. For access to the raw tokens consider using
+ * WP_HTML_Tag_Processor instead.
+ *
+ * @since 6.5.0 Added for internal support; do not use.
+ * @since 6.7.1 Refactored so subclasses may extend.
+ *
+ * @return bool Whether a token was parsed.
+ */
+ public function next_token(): bool {
+ return $this->_next_token();
+ }
+
+ /**
</ins><span class="cx" style="display: block; padding: 0 10px"> * Ensures internal accounting is maintained for HTML semantic rules while
</span><span class="cx" style="display: block; padding: 0 10px"> * the underlying Tag Processor class is seeking to a bookmark.
</span><span class="cx" style="display: block; padding: 0 10px"> *
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -611,13 +627,13 @@
</span><span class="cx" style="display: block; padding: 0 10px"> * semantic rules for text nodes. For access to the raw tokens consider using
</span><span class="cx" style="display: block; padding: 0 10px"> * WP_HTML_Tag_Processor instead.
</span><span class="cx" style="display: block; padding: 0 10px"> *
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- * @since 6.5.0 Added for internal support; do not use.
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ * @since 6.7.1 Added for internal support; do not use.
</ins><span class="cx" style="display: block; padding: 0 10px"> *
</span><span class="cx" style="display: block; padding: 0 10px"> * @access private
</span><span class="cx" style="display: block; padding: 0 10px"> *
</span><span class="cx" style="display: block; padding: 0 10px"> * @return bool
</span><span class="cx" style="display: block; padding: 0 10px"> */
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- public function next_token(): bool {
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ private function _next_token(): bool {
</ins><span class="cx" style="display: block; padding: 0 10px"> $this->current_element = null;
</span><span class="cx" style="display: block; padding: 0 10px">
</span><span class="cx" style="display: block; padding: 0 10px"> if ( isset( $this->last_error ) ) {
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -635,7 +651,7 @@
</span><span class="cx" style="display: block; padding: 0 10px"> * tokens works in the meantime and isn't obviously wrong.
</span><span class="cx" style="display: block; padding: 0 10px"> */
</span><span class="cx" style="display: block; padding: 0 10px"> if ( empty( $this->element_queue ) && $this->step() ) {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- return $this->next_token();
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ return $this->_next_token();
</ins><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"> // Process the next event on the queue.
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -646,7 +662,7 @@
</span><span class="cx" style="display: block; padding: 0 10px"> continue;
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px">
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- return empty( $this->element_queue ) ? false : $this->next_token();
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ return empty( $this->element_queue ) ? false : $this->_next_token();
</ins><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"> $is_pop = WP_HTML_Stack_Event::POP === $this->current_element->operation;
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -657,7 +673,7 @@
</span><span class="cx" style="display: block; padding: 0 10px"> * the breadcrumbs.
</span><span class="cx" style="display: block; padding: 0 10px"> */
</span><span class="cx" style="display: block; padding: 0 10px"> if ( 'root-node' === $this->current_element->token->bookmark_name ) {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- return $this->next_token();
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ return $this->_next_token();
</ins><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"> // Adjust the breadcrumbs for this event.
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -669,7 +685,7 @@
</span><span class="cx" style="display: block; padding: 0 10px">
</span><span class="cx" style="display: block; padding: 0 10px"> // Avoid sending close events for elements which don't expect a closing.
</span><span class="cx" style="display: block; padding: 0 10px"> if ( $is_pop && ! $this->expects_closer( $this->current_element->token ) ) {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- return $this->next_token();
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ return $this->_next_token();
</ins><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"> return true;
</span></span></pre></div>
<a id="trunktestsphpunitdatahtmlapihtmlxpathgeneratingprocessorphp"></a>
<div class="addfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Added: trunk/tests/phpunit/data/html-api/html-xpath-generating-processor.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tests/phpunit/data/html-api/html-xpath-generating-processor.php (rev 0)
+++ trunk/tests/phpunit/data/html-api/html-xpath-generating-processor.php 2024-10-23 22:03:23 UTC (rev 59285)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -0,0 +1,88 @@
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+<?php
+
+class HTML_XPath_Generating_Processor extends WP_HTML_Processor {
+
+ /**
+ * List of tokens that have already been seen.
+ *
+ * @var array<string, int>
+ */
+ public $token_seen_count = array();
+
+ /**
+ * Previous depth.
+ *
+ * @var int
+ */
+ private $previous_depth = 0;
+
+ /**
+ * Open stack indices.
+ *
+ * @since n.e.x.t
+ * @var array<int, array{tag_name: string, index: int}>
+ */
+ private $open_stack_indices = array();
+
+ /**
+ * Gets XPath for the current open tag.
+ *
+ * @return string XPath.
+ */
+ public function get_xpath(): string {
+ $xpath = '';
+ foreach ( $this->open_stack_indices as $level ) {
+ $xpath .= sprintf( '/*[%d][self::%s]', $level['index'] + 1, $level['tag_name'] );
+ }
+ return $xpath;
+ }
+
+ /**
+ * Gets next token.
+ *
+ * @return bool Whether next token was matched.
+ */
+ public function next_token(): bool {
+ $result = parent::next_token();
+ $current_depth = $this->get_current_depth();
+ $current_tag = $this->get_tag();
+
+ $current_depth--; // Because HTML starts at depth 1.
+
+ if ( $this->get_token_type() === '#tag' ) {
+ $token_name = ( $this->is_tag_closer() ? '-' : '+' ) . $current_tag;
+ } else {
+ $token_name = $this->get_token_name();
+ }
+
+ if ( ! isset( $this->token_seen_count[ $token_name ] ) ) {
+ $this->token_seen_count[ $token_name ] = 1;
+ } else {
+ ++$this->token_seen_count[ $token_name ];
+ }
+
+ if ( $this->get_token_type() === '#tag' && ! $this->is_tag_closer() ) {
+ if ( $current_depth < $this->previous_depth ) {
+ array_splice(
+ $this->open_stack_indices,
+ $current_depth + 1
+ );
+ }
+
+ if ( ! isset( $this->open_stack_indices[ $current_depth ] ) ) {
+ $this->open_stack_indices[ $current_depth ] = array(
+ 'tag_name' => $current_tag,
+ 'index' => 0,
+ );
+ } else {
+ $this->open_stack_indices[ $current_depth ]['tag_name'] = $current_tag;
+ ++$this->open_stack_indices[ $current_depth ]['index'];
+ }
+
+ $this->previous_depth = $current_depth;
+ }
+
+ return $result;
+ }
+
+}
</ins><span class="cx" style="display: block; padding: 0 10px">Property changes on: trunk/tests/phpunit/data/html-api/html-xpath-generating-processor.php
</span><span class="cx" style="display: block; padding: 0 10px">___________________________________________________________________
</span></span></pre></div>
<a id="svneolstyle"></a>
<div class="addfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Added: svn:eol-style</h4></div>
<ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+native
</ins><span class="cx" style="display: block; padding: 0 10px">\ No newline at end of property
</span><a id="trunktestsphpunittestshtmlapiwpHtmlProcessorphp"></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/wpHtmlProcessor.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tests/phpunit/tests/html-api/wpHtmlProcessor.php 2024-10-23 18:29:32 UTC (rev 59284)
+++ trunk/tests/phpunit/tests/html-api/wpHtmlProcessor.php 2024-10-23 22:03:23 UTC (rev 59285)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -882,4 +882,180 @@
</span><span class="cx" style="display: block; padding: 0 10px"> $this->assertSame( 'FORM', $processor->get_tag() );
</span><span class="cx" style="display: block; padding: 0 10px"> $this->assertTrue( $processor->is_tag_closer() );
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+
+ /**
+ * Data provider.
+ *
+ * @return array
+ */
+ public function data_html_processor_with_extended_next_token() {
+ return array(
+ 'single_instance_per_tag' => array(
+ 'html' => '
+ <html>
+ <head>
+ <meta charset="utf-8">
+ <title>Hello World</title>
+ </head>
+ <body>
+ <h1>Hello World!</h1>
+ <img src="example.png">
+ <p>Each tag should occur only once in this document.<!--Closing P tag omitted intentionally.-->
+ <footer>The end.</footer>
+ </body>
+ </html>
+ ',
+ 'expected_token_counts' => array(
+ '+HTML' => 1,
+ '+HEAD' => 1,
+ '#text' => 14,
+ '+META' => 1,
+ '+TITLE' => 1,
+ '-HEAD' => 1,
+ '+BODY' => 1,
+ '+H1' => 1,
+ '-H1' => 1,
+ '+IMG' => 1,
+ '+P' => 1,
+ '#comment' => 1,
+ '-P' => 1,
+ '+FOOTER' => 1,
+ '-FOOTER' => 1,
+ '-BODY' => 1,
+ '-HTML' => 1,
+ '' => 1,
+ ),
+ 'expected_xpaths' => array(
+ 0 => '/*[1][self::HTML]',
+ 1 => '/*[1][self::HTML]/*[1][self::HEAD]',
+ 2 => '/*[1][self::HTML]/*[1][self::HEAD]/*[1][self::META]',
+ 3 => '/*[1][self::HTML]/*[1][self::HEAD]/*[2][self::TITLE]',
+ 4 => '/*[1][self::HTML]/*[2][self::BODY]',
+ 5 => '/*[1][self::HTML]/*[2][self::BODY]/*[1][self::H1]',
+ 6 => '/*[1][self::HTML]/*[2][self::BODY]/*[2][self::IMG]',
+ 7 => '/*[1][self::HTML]/*[2][self::BODY]/*[3][self::P]',
+ 8 => '/*[1][self::HTML]/*[2][self::BODY]/*[4][self::FOOTER]',
+ ),
+ ),
+
+ 'multiple_tag_instances' => array(
+ 'html' => '
+ <html>
+ <body>
+ <h1>Hello World!</h1>
+ <p>First
+ <p>Second
+ <p>Third
+ <ul>
+ <li>1
+ <li>2
+ <li>3
+ </ul>
+ </body>
+ </html>
+ ',
+ 'expected_token_counts' => array(
+ '+HTML' => 1,
+ '+HEAD' => 1,
+ '-HEAD' => 1,
+ '+BODY' => 1,
+ '#text' => 13,
+ '+H1' => 1,
+ '-H1' => 1,
+ '+P' => 3,
+ '-P' => 3,
+ '+UL' => 1,
+ '+LI' => 3,
+ '-LI' => 3,
+ '-UL' => 1,
+ '-BODY' => 1,
+ '-HTML' => 1,
+ '' => 1,
+ ),
+ 'expected_xpaths' => array(
+ 0 => '/*[1][self::HTML]',
+ 1 => '/*[1][self::HTML]/*[1][self::HEAD]',
+ 2 => '/*[1][self::HTML]/*[2][self::BODY]',
+ 3 => '/*[1][self::HTML]/*[2][self::BODY]/*[1][self::H1]',
+ 4 => '/*[1][self::HTML]/*[2][self::BODY]/*[2][self::P]',
+ 5 => '/*[1][self::HTML]/*[2][self::BODY]/*[3][self::P]',
+ 6 => '/*[1][self::HTML]/*[2][self::BODY]/*[4][self::P]',
+ 7 => '/*[1][self::HTML]/*[2][self::BODY]/*[5][self::UL]',
+ 8 => '/*[1][self::HTML]/*[2][self::BODY]/*[5][self::UL]/*[1][self::LI]',
+ 9 => '/*[1][self::HTML]/*[2][self::BODY]/*[5][self::UL]/*[2][self::LI]',
+ 10 => '/*[1][self::HTML]/*[2][self::BODY]/*[5][self::UL]/*[3][self::LI]',
+ ),
+ ),
+
+ 'extreme_nested_formatting' => array(
+ 'html' => '
+ <html>
+ <body>
+ <p>
+ <strong><em><strike><i><b><u>FORMAT</u></b></i></strike></em></strong>
+ </p>
+ </body>
+ </html>
+ ',
+ 'expected_token_counts' => array(
+ '+HTML' => 1,
+ '+HEAD' => 1,
+ '-HEAD' => 1,
+ '+BODY' => 1,
+ '#text' => 7,
+ '+P' => 1,
+ '+STRONG' => 1,
+ '+EM' => 1,
+ '+STRIKE' => 1,
+ '+I' => 1,
+ '+B' => 1,
+ '+U' => 1,
+ '-U' => 1,
+ '-B' => 1,
+ '-I' => 1,
+ '-STRIKE' => 1,
+ '-EM' => 1,
+ '-STRONG' => 1,
+ '-P' => 1,
+ '-BODY' => 1,
+ '-HTML' => 1,
+ '' => 1,
+ ),
+ 'expected_xpaths' => array(
+ 0 => '/*[1][self::HTML]',
+ 1 => '/*[1][self::HTML]/*[1][self::HEAD]',
+ 2 => '/*[1][self::HTML]/*[2][self::BODY]',
+ 3 => '/*[1][self::HTML]/*[2][self::BODY]/*[1][self::P]',
+ 4 => '/*[1][self::HTML]/*[2][self::BODY]/*[1][self::P]/*[1][self::STRONG]',
+ 5 => '/*[1][self::HTML]/*[2][self::BODY]/*[1][self::P]/*[1][self::STRONG]/*[1][self::EM]',
+ 6 => '/*[1][self::HTML]/*[2][self::BODY]/*[1][self::P]/*[1][self::STRONG]/*[1][self::EM]/*[1][self::STRIKE]',
+ 7 => '/*[1][self::HTML]/*[2][self::BODY]/*[1][self::P]/*[1][self::STRONG]/*[1][self::EM]/*[1][self::STRIKE]/*[1][self::I]',
+ 8 => '/*[1][self::HTML]/*[2][self::BODY]/*[1][self::P]/*[1][self::STRONG]/*[1][self::EM]/*[1][self::STRIKE]/*[1][self::I]/*[1][self::B]',
+ 9 => '/*[1][self::HTML]/*[2][self::BODY]/*[1][self::P]/*[1][self::STRONG]/*[1][self::EM]/*[1][self::STRIKE]/*[1][self::I]/*[1][self::B]/*[1][self::U]',
+ ),
+ ),
+ );
+ }
+
+ /**
+ * Ensures that subclasses to WP_HTML_Processor can do bookkeeping by extending the next_token() method.
+ *
+ * @ticket ?
+ * @dataProvider data_html_processor_with_extended_next_token
+ */
+ public function test_ensure_next_token_method_extensibility( $html, $expected_token_counts, $expected_xpaths ) {
+ require_once DIR_TESTDATA . '/html-api/html-xpath-generating-processor.php';
+
+ $processor = HTML_XPath_Generating_Processor::create_full_parser( $html );
+ $actual_xpaths = array();
+ while ( $processor->next_tag() ) {
+ if ( ! $processor->is_tag_closer() ) {
+ $processor->set_attribute( 'xpath', $processor->get_xpath() );
+ $actual_xpaths[] = $processor->get_xpath();
+ }
+ }
+
+ $this->assertEquals( $expected_token_counts, $processor->token_seen_count, 'Snapshot: ' . var_export( $processor->token_seen_count, true ) );
+ $this->assertEquals( $expected_xpaths, $actual_xpaths, 'Snapshot: ' . var_export( $actual_xpaths, true ) );
+ }
</ins><span class="cx" style="display: block; padding: 0 10px"> }
</span></span></pre>
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