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File: /home/iideug/public_html/anubhav.iideug.com/wp-includes/html-api/class-wp-html-processor.php <?php /** * HTML API: WP_HTML_Processor class * * @package WordPress * @subpackage HTML-API * @since 6.4.0 */ /** * Core class used to safely parse and modify an HTML document. * * The HTML Processor class properly parses and modifies HTML5 documents. * * It supports a subset of the HTML5 specification, and when it encounters * unsupported markup, it aborts early to avoid unintentionally breaking * the document. The HTML Processor should never break an HTML document. * * While the `WP_HTML_Tag_Processor` is a valuable tool for modifying * attributes on individual HTML tags, the HTML Processor is more capable * and useful for the following operations: * * - Querying based on nested HTML structure. * * Eventually the HTML Processor will also support: * - Wrapping a tag in surrounding HTML. * - Unwrapping a tag by removing its parent. * - Inserting and removing nodes. * - Reading and changing inner content. * - Navigating up or around HTML structure. * * ## Usage * * Use of this class requires three steps: * * 1. Call a static creator method with your input HTML document. * 2. Find the location in the document you are looking for. * 3. Request changes to the document at that location. * * Example: * * $processor = WP_HTML_Processor::create_fragment( $html ); * if ( $processor->next_tag( array( 'breadcrumbs' => array( 'DIV', 'FIGURE', 'IMG' ) ) ) ) { * $processor->add_class( 'responsive-image' ); * } * * #### Breadcrumbs * * Breadcrumbs represent the stack of open elements from the root * of the document or fragment down to the currently-matched node, * if one is currently selected. Call WP_HTML_Processor::get_breadcrumbs() * to inspect the breadcrumbs for a matched tag. * * Breadcrumbs can specify nested HTML structure and are equivalent * to a CSS selector comprising tag names separated by the child * combinator, such as "DIV > FIGURE > IMG". * * Since all elements find themselves inside a full HTML document * when parsed, the return value from `get_breadcrumbs()` will always * contain any implicit outermost elements. For example, when parsing * with `create_fragment()` in the `BODY` context (the default), any * tag in the given HTML document will contain `array( 'HTML', 'BODY', … )` * in its breadcrumbs. * * Despite containing the implied outermost elements in their breadcrumbs, * tags may be found with the shortest-matching breadcrumb query. That is, * `array( 'IMG' )` matches all IMG elements and `array( 'P', 'IMG' )` * matches all IMG elements directly inside a P element. To ensure that no * partial matches erroneously match it's possible to specify in a query * the full breadcrumb match all the way down from the root HTML element. * * Example: * * $html = '<figure><img><figcaption>A <em>lovely</em> day outside</figcaption></figure>'; * // ----- Matches here. * $processor->next_tag( array( 'breadcrumbs' => array( 'FIGURE', 'IMG' ) ) ); * * $html = '<figure><img><figcaption>A <em>lovely</em> day outside</figcaption></figure>'; * // ---- Matches here. * $processor->next_tag( array( 'breadcrumbs' => array( 'FIGURE', 'FIGCAPTION', 'EM' ) ) ); * * $html = '<div><img></div><img>'; * // ----- Matches here, because IMG must be a direct child of the implicit BODY. * $processor->next_tag( array( 'breadcrumbs' => array( 'BODY', 'IMG' ) ) ); * * ## HTML Support * * This class implements a small part of the HTML5 specification. * It's designed to operate within its support and abort early whenever * encountering circumstances it can't properly handle. This is * the principle way in which this class remains as simple as possible * without cutting corners and breaking compliance. * * ### Supported elements * * If any unsupported element appears in the HTML input the HTML Processor * will abort early and stop all processing. This draconian measure ensures * that the HTML Processor won't break any HTML it doesn't fully understand. * * The HTML Processor supports all elements other than a specific set: * * - Any element inside a TABLE. * - Any element inside foreign content, including SVG and MATH. * - Any element outside the IN BODY insertion mode, e.g. doctype declarations, meta, links. * * ### Supported markup * * Some kinds of non-normative HTML involve reconstruction of formatting elements and * re-parenting of mis-nested elements. For example, a DIV tag found inside a TABLE * may in fact belong _before_ the table in the DOM. If the HTML Processor encounters * such a case it will stop processing. * * The following list illustrates some common examples of unexpected HTML inputs that * the HTML Processor properly parses and represents: * * - HTML with optional tags omitted, e.g. `<p>one<p>two`. * - HTML with unexpected tag closers, e.g. `<p>one </span> more</p>`. * - Non-void tags with self-closing flag, e.g. `<div/>the DIV is still open.</div>`. * - Heading elements which close open heading elements of another level, e.g. `<h1>Closed by </h2>`. * - Elements containing text that looks like other tags but isn't, e.g. `<title>The <img> is plaintext</title>`. * - SCRIPT and STYLE tags containing text that looks like HTML but isn't, e.g. `<script>document.write('<p>Hi</p>');</script>`. * - SCRIPT content which has been escaped, e.g. `<script><!-- document.write('<script>console.log("hi")</script>') --></script>`. * * ### Unsupported Features * * This parser does not report parse errors. * * Normally, when additional HTML or BODY tags are encountered in a document, if there * are any additional attributes on them that aren't found on the previous elements, * the existing HTML and BODY elements adopt those missing attribute values. This * parser does not add those additional attributes. * * In certain situations, elements are moved to a different part of the document in * a process called "adoption" and "fostering." Because the nodes move to a location * in the document that the parser had already processed, this parser does not support * these situations and will bail. * * @since 6.4.0 * * @see WP_HTML_Tag_Processor * @see https://html.spec.whatwg.org/ */ class WP_HTML_Processor extends WP_HTML_Tag_Processor { /** * The maximum number of bookmarks allowed to exist at any given time. * * HTML processing requires more bookmarks than basic tag processing, * so this class constant from the Tag Processor is overwritten. * * @since 6.4.0 * * @var int */ const MAX_BOOKMARKS = 100; /** * Holds the working state of the parser, including the stack of * open elements and the stack of active formatting elements. * * Initialized in the constructor. * * @since 6.4.0 * * @var WP_HTML_Processor_State */ private $state; /** * Used to create unique bookmark names. * * This class sets a bookmark for every tag in the HTML document that it encounters. * The bookmark name is auto-generated and increments, starting with `1`. These are * internal bookmarks and are automatically released when the referring WP_HTML_Token * goes out of scope and is garbage-collected. * * @since 6.4.0 * * @see WP_HTML_Processor::$release_internal_bookmark_on_destruct * * @var int */ private $bookmark_counter = 0; /** * Stores an explanation for why something failed, if it did. * * @see self::get_last_error * * @since 6.4.0 * * @var string|null */ private $last_error = null; /** * Stores context for why the parser bailed on unsupported HTML, if it did. * * @see self::get_unsupported_exception * * @since 6.7.0 * * @var WP_HTML_Unsupported_Exception|null */ private $unsupported_exception = null; /** * Releases a bookmark when PHP garbage-collects its wrapping WP_HTML_Token instance. * * This function is created inside the class constructor so that it can be passed to * the stack of open elements and the stack of active formatting elements without * exposing it as a public method on the class. * * @since 6.4.0 * * @var Closure|null */ private $release_internal_bookmark_on_destruct = null; /** * Stores stack events which arise during parsing of the * HTML document, which will then supply the "match" events. * * @since 6.6.0 * * @var WP_HTML_Stack_Event[] */ private $element_queue = array(); /** * Stores the current breadcrumbs. * * @since 6.7.0 * * @var string[] */ private $breadcrumbs = array(); /** * Current stack event, if set, representing a matched token. * * Because the parser may internally point to a place further along in a document * than the nodes which have already been processed (some "virtual" nodes may have * appeared while scanning the HTML document), this will point at the "current" node * being processed. It comes from the front of the element queue. * * @since 6.6.0 * * @var WP_HTML_Stack_Event|null */ private $current_element = null; /** * Context node if created as a fragment parser. * * @var WP_HTML_Token|null */ private $context_node = null; /* * Public Interface Functions */ /** * Creates an HTML processor in the fragment parsing mode. * * Use this for cases where you are processing chunks of HTML that * will be found within a bigger HTML document, such as rendered * block output that exists within a post, `the_content` inside a * rendered site layout. * * Fragment parsing occurs within a context, which is an HTML element * that the document will eventually be placed in. It becomes important * when special elements have different rules than others, such as inside * a TEXTAREA or a TITLE tag where things that look like tags are text, * or inside a SCRIPT tag where things that look like HTML syntax are JS. * * The context value should be a representation of the tag into which the * HTML is found. For most cases this will be the body element. The HTML * form is provided because a context element may have attributes that * impact the parse, such as with a SCRIPT tag and its `type` attribute. * * ## Current HTML Support * * - The only supported context is `<body>`, which is the default value. * - The only supported document encoding is `UTF-8`, which is the default value. * * @since 6.4.0 * @since 6.6.0 Returns `static` instead of `self` so it can create subclass instances. * * @param string $html Input HTML fragment to process. * @param string $context Context element for the fragment, must be default of `<body>`. * @param string $encoding Text encoding of the document; must be default of 'UTF-8'. * @return static|null The created processor if successful, otherwise null. */ public static function create_fragment( $html, $context = '<body>', $encoding = 'UTF-8' ) { if ( '<body>' !== $context || 'UTF-8' !== $encoding ) { return null; } if ( ! is_string( $html ) ) { _doing_it_wrong( __METHOD__, __( 'The HTML parameter must be a string.' ), '6.9.0' ); return null; } $context_processor = static::create_full_parser( "<!DOCTYPE html>{$context}", $encoding ); if ( null === $context_processor ) { return null; } while ( $context_processor->next_tag() ) { if ( ! $context_processor->is_virtual() ) { $context_processor->set_bookmark( 'final_node' ); } } if ( ! $context_processor->has_bookmark( 'final_node' ) || ! $context_processor->seek( 'final_node' ) ) { _doing_it_wrong( __METHOD__, __( 'No valid context element was detected.' ), '6.8.0' ); return null; } return $context_processor->create_fragment_at_current_node( $html ); } /** * Creates an HTML processor in the full parsing mode. * * It's likely that a fragment parser is more appropriate, unless sending an * entire HTML document from start to finish. Consider a fragment parser with * a context node of `<body>`. * * UTF-8 is the only allowed encoding. If working with a document that * isn't UTF-8, first convert the document to UTF-8, then pass in the * converted HTML. * * @param string $html Input HTML document to process. * @param string|null $known_definite_encoding Optional. If provided, specifies the charset used * in the input byte stream. Currently must be UTF-8. * @return static|null The created processor if successful, otherwise null. */ public static function create_full_parser( $html, $known_definite_encoding = 'UTF-8' ) { if ( 'UTF-8' !== $known_definite_encoding ) { return null; } if ( ! is_string( $html ) ) { _doing_it_wrong( __METHOD__, __( 'The HTML parameter must be a string.' ), '6.9.0' ); return null; } $processor = new static( $html, self::CONSTRUCTOR_UNLOCK_CODE ); $processor->state->encoding = $known_definite_encoding; $processor->state->encoding_confidence = 'certain'; return $processor; } /** * Constructor. * * Do not use this method. Use the static creator methods instead. * * @access private * * @since 6.4.0 * * @see WP_HTML_Processor::create_fragment() * * @param string $html HTML to process. * @param string|null $use_the_static_create_methods_instead This constructor should not be called manually. */ public function __construct( $html, $use_the_static_create_methods_instead = null ) { parent::__construct( $html ); if ( self::CONSTRUCTOR_UNLOCK_CODE !== $use_the_static_create_methods_instead ) { _doing_it_wrong( __METHOD__, sprintf( /* translators: %s: WP_HTML_Processor::create_fragment(). */ __( 'Call %s to create an HTML Processor instead of calling the constructor directly.' ), '<code>WP_HTML_Processor::create_fragment()</code>' ), '6.4.0' ); } $this->state = new WP_HTML_Processor_State(); $this->state->stack_of_open_elements->set_push_handler( function ( WP_HTML_Token $token ): void { $is_virtual = ! isset( $this->state->current_token ) || $this->is_tag_closer(); $same_node = isset( $this->state->current_token ) && $token->node_name === $this->state->current_token->node_name; $provenance = ( ! $same_node || $is_virtual ) ? 'virtual' : 'real'; $this->element_queue[] = new WP_HTML_Stack_Event( $token, WP_HTML_Stack_Event::PUSH, $provenance ); $this->change_parsing_namespace( $token->integration_node_type ? 'html' : $token->namespace ); } ); $this->state->stack_of_open_elements->set_pop_handler( function ( WP_HTML_Token $token ): void { $is_virtual = ! isset( $this->state->current_token ) || ! $this->is_tag_closer(); $same_node = isset( $this->state->current_token ) && $token->node_name === $this->state->current_token->node_name; $provenance = ( ! $same_node || $is_virtual ) ? 'virtual' : 'real'; $this->element_queue[] = new WP_HTML_Stack_Event( $token, WP_HTML_Stack_Event::POP, $provenance ); $adjusted_current_node = $this->get_adjusted_current_node(); if ( $adjusted_current_node ) { $this->change_parsing_namespace( $adjusted_current_node->integration_node_type ? 'html' : $adjusted_current_node->namespace ); } else { $this->change_parsing_namespace( 'html' ); } } ); /* * Create this wrapper so that it's possible to pass * a private method into WP_HTML_Token classes without * exposing it to any public API. */ $this->release_internal_bookmark_on_destruct = function ( string $name ): void { parent::release_bookmark( $name ); }; } /** * Creates a fragment processor at the current node. * * HTML Fragment parsing always happens with a context node. HTML Fragment Processors can be * instantiated with a `BODY` context node via `WP_HTML_Processor::create_fragment( $html )`. * * The context node may impact how a fragment of HTML is parsed. For example, consider the HTML * fragment `<td />Inside TD?</td>`. * * A BODY context node will produce the following tree: * * └─#text Inside TD? * * Notice that the `<td>` tags are completely ignored. * * Compare that with an SVG context node that produces the following tree: * * ├─svg:td * └─#text Inside TD? * * Here, a `td` node in the `svg` namespace is created, and its self-closing flag is respected. * This is a peculiarity of parsing HTML in foreign content like SVG. * * Finally, consider the tree produced with a TABLE context node: * * └─TBODY * └─TR * └─TD * └─#text Inside TD? * * These examples demonstrate how important the context node may be when processing an HTML * fragment. Special care must be taken when processing fragments that are expected to appear * in specific contexts. SVG and TABLE are good examples, but there are others. * * @see https://html.spec.whatwg.org/multipage/parsing.html#html-fragment-parsing-algorithm * * @since 6.8.0 * * @param string $html Input HTML fragment to process. * @return static|null The created processor if successful, otherwise null. */ private function create_fragment_at_current_node( string $html ) { if ( $this->get_token_type() !== '#tag' || $this->is_tag_closer() ) { _doing_it_wrong( __METHOD__, __( 'The context element must be a start tag.' ), '6.8.0' ); return null; } $tag_name = $this->current_element->token->node_name; $namespace = $this->current_element->token->namespace; if ( 'html' === $namespace && self::is_void( $tag_name ) ) { _doing_it_wrong( __METHOD__, sprintf( // translators: %s: A tag name like INPUT or BR. __( 'The context element cannot be a void element, found "%s".' ), $tag_name ), '6.8.0' ); return null; } /* * Prevent creating fragments at nodes that require a special tokenizer state. * This is unsupported by the HTML Processor. */ if ( 'html' === $namespace && in_array( $tag_name, array( 'IFRAME', 'NOEMBED', 'NOFRAMES', 'SCRIPT', 'STYLE', 'TEXTAREA', 'TITLE', 'XMP', 'PLAINTEXT' ), true ) ) { _doing_it_wrong( __METHOD__, sprintf( // translators: %s: A tag name like IFRAME or TEXTAREA. __( 'The context element "%s" is not supported.' ), $tag_name ), '6.8.0' ); return null; } $fragment_processor = new static( $html, self::CONSTRUCTOR_UNLOCK_CODE ); $fragment_processor->compat_mode = $this->compat_mode; // @todo Create "fake" bookmarks for non-existent but implied nodes. $fragment_processor->bookmarks['root-node'] = new WP_HTML_Span( 0, 0 ); $root_node = new WP_HTML_Token( 'root-node', 'HTML', false ); $fragment_processor->state->stack_of_open_elements->push( $root_node ); $fragment_processor->bookmarks['context-node'] = new WP_HTML_Span( 0, 0 ); $fragment_processor->context_node = clone $this->current_element->token; $fragment_processor->context_node->bookmark_name = 'context-node'; $fragment_processor->context_node->on_destroy = null; $fragment_processor->breadcrumbs = array( 'HTML', $fragment_processor->context_node->node_name ); if ( 'TEMPLATE' === $fragment_processor->context_node->node_name ) { $fragment_processor->state->stack_of_template_insertion_modes[] = WP_HTML_Processor_State::INSERTION_MODE_IN_TEMPLATE; } $fragment_processor->reset_insertion_mode_appropriately(); /* * > Set the parser's form element pointer to the nearest node to the context element that * > is a form element (going straight up the ancestor chain, and including the element * > itself, if it is a form element), if any. (If there is no such form element, the * > form element pointer keeps its initial value, null.) */ foreach ( $this->state->stack_of_open_elements->walk_up() as $element ) { if ( 'FORM' === $element->node_name && 'html' === $element->namespace ) { $fragment_processor->state->form_element = clone $element; $fragment_processor->state->form_element->bookmark_name = null; $fragment_processor->state->form_element->on_destroy = null; break; } } $fragment_processor->state->encoding_confidence = 'irrelevant'; /* * Update the parsing namespace near the end of the process. * This is important so that any push/pop from the stack of open * elements does not change the parsing namespace. */ $fragment_processor->change_parsing_namespace( $this->current_element->token->integration_node_type ? 'html' : $namespace ); return $fragment_processor; } /** * Stops the parser and terminates its execution when encountering unsupported markup. * * @throws WP_HTML_Unsupported_Exception Halts execution of the parser. * * @since 6.7.0 * * @param string $message Explains support is missing in order to parse the current node. */ private function bail( string $message ) { $here = $this->bookmarks[ $this->state->current_token->bookmark_name ]; $token = substr( $this->html, $here->start, $here->length ); $open_elements = array(); foreach ( $this->state->stack_of_open_elements->stack as $item ) { $open_elements[] = $item->node_name; } $active_formats = array(); foreach ( $this->state->active_formatting_elements->walk_down() as $item ) { $active_formats[] = $item->node_name; } $this->last_error = self::ERROR_UNSUPPORTED; $this->unsupported_exception = new WP_HTML_Unsupported_Exception( $message, $this->state->current_token->node_name, $here->start, $token, $open_elements, $active_formats ); throw $this->unsupported_exception; } /** * Returns the last error, if any. * * Various situations lead to parsing failure but this class will * return `false` in all those cases. To determine why something * failed it's possible to request the last error. This can be * helpful to know to distinguish whether a given tag couldn't * be found or if content in the document caused the processor * to give up and abort processing. * * Example * * $processor = WP_HTML_Processor::create_fragment( '<template><strong><button><em><p><em>' ); * false === $processor->next_tag(); * WP_HTML_Processor::ERROR_UNSUPPORTED === $processor->get_last_error(); * * @since 6.4.0 * * @see self::ERROR_UNSUPPORTED * @see self::ERROR_EXCEEDED_MAX_BOOKMARKS * * @return string|null The last error, if one exists, otherwise null. */ public function get_last_error(): ?string { return $this->last_error; } /** * Returns context for why the parser aborted due to unsupported HTML, if it did. * * This is meant for debugging purposes, not for production use. * * @since 6.7.0 * * @see self::$unsupported_exception * * @return WP_HTML_Unsupported_Exception|null */ public function get_unsupported_exception() { return $this->unsupported_exception; } /** * Finds the next tag matching the $query. * * @todo Support matching the class name and tag name. * * @since 6.4.0 * @since 6.6.0 Visits all tokens, including virtual ones. * * @throws Exception When unable to allocate a bookmark for the next token in the input HTML document. * * @param array|string|null $query { * Optional. Which tag name to find, having which class, etc. Default is to find any tag. * * @type string|null $tag_name Which tag to find, or `null` for "any tag." * @type string $tag_closers 'visit' to pause at tag closers, 'skip' or unset to only visit openers. * @type int|null $match_offset Find the Nth tag matching all search criteria. * 1 for "first" tag, 3 for "third," etc. * Defaults to first tag. * @type string|null $class_name Tag must contain this whole class name to match. * @type string[] $breadcrumbs DOM sub-path at which element is found, e.g. `array( 'FIGURE', 'IMG' )`. * May also contain the wildcard `*` which matches a single element, e.g. `array( 'SECTION', '*' )`. * } * @return bool Whether a tag was matched. */ public function next_tag( $query = null ): bool { $visit_closers = isset( $query['tag_closers'] ) && 'visit' === $query['tag_closers']; if ( null === $query ) { while ( $this->next_token() ) { if ( '#tag' !== $this->get_token_type() ) { continue; } if ( ! $this->is_tag_closer() || $visit_closers ) { return true; } } return false; } if ( is_string( $query ) ) { $query = array( 'breadcrumbs' => array( $query ) ); } if ( ! is_array( $query ) ) { _doing_it_wrong( __METHOD__, __( 'Please pass a query array to this function.' ), '6.4.0' ); return false; } if ( isset( $query['tag_name'] ) ) { $query['tag_name'] = strtoupper( $query['tag_name'] ); } $needs_class = ( isset( $query['class_name'] ) && is_string( $query['class_name'] ) ) ? $query['class_name'] : null; if ( ! ( array_key_exists( 'breadcrumbs', $query ) && is_array( $query['breadcrumbs'] ) ) ) { while ( $this->next_token() ) { if ( '#tag' !== $this->get_token_type() ) { continue; } if ( isset( $query['tag_name'] ) && $query['tag_name'] !== $this->get_token_name() ) { continue; } if ( isset( $needs_class ) && ! $this->has_class( $needs_class ) ) { continue; } if ( ! $this->is_tag_closer() || $visit_closers ) { return true; } } return false; } $breadcrumbs = $query['breadcrumbs']; $match_offset = isset( $query['match_offset'] ) ? (int) $query['match_offset'] : 1; while ( $match_offset > 0 && $this->next_token() ) { if ( '#tag' !== $this->get_token_type() || $this->is_tag_closer() ) { continue; } if ( isset( $needs_class ) && ! $this->has_class( $needs_class ) ) { continue; } if ( $this->matches_breadcrumbs( $breadcrumbs ) && 0 === --$match_offset ) { return true; } } return false; } /** * 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 6.7.2 Refactored so subclasses may extend. * * @return bool Whether a token was parsed. */ public function next_token(): bool { return $this->next_visitable_token(); } /** * Ensures internal accounting is maintained for HTML semantic rules while * the underlying Tag Processor class is seeking to a bookmark. * * 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. * * Note that this method may call itself recursively. This is why it is not * implemented as {@see WP_HTML_Processor::next_token()}, which instead calls * this method similarly to how {@see WP_HTML_Tag_Processor::next_token()} * calls the {@see WP_HTML_Tag_Processor::base_class_next_token()} method. * * @since 6.7.2 Added for internal support. * * @access private * * @return bool */ private function next_visitable_token(): bool { $this->current_element = null; if ( isset( $this->last_error ) ) { return false; } /* * Prime the events if there are none. * * @todo In some cases, probably related to the adoption agency * algorithm, this call to step() doesn't create any new * events. Calling it again creates them. Figure out why * this is and if it's inherent or if it's a bug. Looping * until there are events or until there are no more * tokens works in the meantime and isn't obviously wrong. */ if ( empty( $this->element_queue ) && $this->step() ) { return $this->next_visitable_token(); } // Process the next event on the queue. $this->current_element = array_shift( $this->element_queue ); if ( ! isset( $this->current_element ) ) { // There are no tokens left, so close all remaining open elements. while ( $this->state->stack_of_open_elements->pop() ) { continue; } return empty( $this->element_queue ) ? false : $this->next_visitable_token(); } $is_pop = WP_HTML_Stack_Event::POP === $this->current_element->operation; /* * The root node only exists in the fragment parser, and closing it * indicates that the parse is complete. Stop before popping it from * the breadcrumbs. */ if ( 'root-node' === $this->current_element->token->bookmark_name ) { return $this->next_visitable_token(); } // Adjust the breadcrumbs for this event. if ( $is_pop ) { array_pop( $this->breadcrumbs ); } else { $this->breadcrumbs[] = $this->current_element->token->node_name; } // Avoid sending close events for elements which don't expect a closing. if ( $is_pop && ! $this->expects_closer( $this->current_element->token ) ) { return $this->next_visitable_token(); } return true; } /** * Indicates if the current tag token is a tag closer. * * Example: * * $p = WP_HTML_Processor::create_fragment( '<div></div>' ); * $p->next_tag( array( 'tag_name' => 'div', 'tag_closers' => 'visit' ) ); * $p->is_tag_closer() === false; * * $p->next_tag( array( 'tag_name' => 'div', 'tag_closers' => 'visit' ) ); * $p->is_tag_closer() === true; * * @since 6.6.0 Subclassed for HTML Processor. * * @return bool Whether the current tag is a tag closer. */ public function is_tag_closer(): bool { return $this->is_virtual() ? ( WP_HTML_Stack_Event::POP === $this->current_element->operation && '#tag' === $this->get_token_type() ) : parent::is_tag_closer(); } /** * Indicates if the currently-matched token is virtual, created by a stack operation * while processing HTML, rather than a token found in the HTML text itself. * * @since 6.6.0 * * @return bool Whether the current token is virtual. */ private function is_virtual(): bool { return ( isset( $this->current_element->provenance ) && 'virtual' === $this->current_element->provenance ); } /** * Indicates if the currently-matched tag matches the given breadcrumbs. * * A "*" represents a single tag wildcard, where any tag matches, but not no tags. * * At some point this function _may_ support a `**` syntax for matching any number * of unspecified tags in the breadcrumb stack. This has been intentionally left * out, however, to keep this function simple and to avoid introducing backtracking, * which could open up surprising performance breakdowns. * * Example: * * $processor = WP_HTML_Processor::create_fragment( '<div><span><figure><img></figure></span></div>' ); * $processor->next_tag( 'img' ); * true === $processor->matches_breadcrumbs( array( 'figure', 'img' ) ); * true === $processor->matches_breadcrumbs( array( 'span', 'figure', 'img' ) ); * false === $processor->matches_breadcrumbs( array( 'span', 'img' ) ); * true === $processor->matches_breadcrumbs( array( 'span', '*', 'img' ) ); * * @since 6.4.0 * * @param string[] $breadcrumbs DOM sub-path at which element is found, e.g. `array( 'FIGURE', 'IMG' )`. * May also contain the wildcard `*` which matches a single element, e.g. `array( 'SECTION', '*' )`. * @return bool Whether the currently-matched tag is found at the given nested structure. */ public function matches_breadcrumbs( $breadcrumbs ): bool { // Everything matches when there are zero constraints. if ( 0 === count( $breadcrumbs ) ) { return true; } // Start at the last crumb. $crumb = end( $breadcrumbs ); if ( '*' !== $crumb && $this->get_tag() !== strtoupper( $crumb ) ) { return false; } for ( $i = count( $this->breadcrumbs ) - 1; $i >= 0; $i-- ) { $node = $this->breadcrumbs[ $i ]; $crumb = strtoupper( current( $breadcrumbs ) ); if ( '*' !== $crumb && $node !== $crumb ) { return false; } if ( false === prev( $breadcrumbs ) ) { return true; } } return false; } /** * Indicates if the currently-matched node expects a closing * token, or if it will self-close on the next step. * * Most HTML elements expect a closer, such as a P element or * a DIV element. Others, like an IMG element are void and don't * have a closing tag. Special elements, such as SCRIPT and STYLE, * are treated just like void tags. Text nodes and self-closing * foreign content will also act just like a void tag, immediately * closing as soon as the processor advances to the next token. * * @since 6.6.0 * * @param WP_HTML_Token|null $node Optional. Node to examine, if provided. * Default is to examine current node. * @return bool|null Whether to expect a closer for the currently-matched node, * or `null` if not matched on any token. */ public function expects_closer( ?WP_HTML_Token $node = null ): ?bool { $token_name = $node->node_name ?? $this->get_token_name(); if ( ! isset( $token_name ) ) { return null; } $token_namespace = $node->namespace ?? $this->get_namespace(); $token_has_self_closing = $node->has_self_closing_flag ?? $this->has_self_closing_flag(); return ! ( // Comments, text nodes, and other atomic tokens. '#' === $token_name[0] || // Doctype declarations. 'html' === $token_name || // Void elements. ( 'html' === $token_namespace && self::is_void( $token_name ) ) || // Special atomic elements. ( 'html' === $token_namespace && in_array( $token_name, array( 'IFRAME', 'NOEMBED', 'NOFRAMES', 'SCRIPT', 'STYLE', 'TEXTAREA', 'TITLE', 'XMP' ), true ) ) || // Self-closing elements in foreign content. ( 'html' !== $token_namespace && $token_has_self_closing ) ); } /** * Steps through the HTML document and stop at the next tag, if any. * * @since 6.4.0 * * @throws Exception When unable to allocate a bookmark for the next token in the input HTML document. * * @see self::PROCESS_NEXT_NODE * @see self::REPROCESS_CURRENT_NODE * * @param string $node_to_process Whether to parse the next node or reprocess the current node. * @return bool Whether a tag was matched. */ public function step( $node_to_process = self::PROCESS_NEXT_NODE ): bool { // Refuse to proceed if there was a previous error. if ( null !== $this->last_error ) { return false; } if ( self::REPROCESS_CURRENT_NODE !== $node_to_process ) { /* * Void elements still hop onto the stack of open elements even though * there's no corresponding closing tag. This is important for managing * stack-based operations such as "navigate to parent node" or checking * on an element's breadcrumbs. * * When moving on to the next node, therefore, if the bottom-most element * on the stack is a void element, it must be closed. */ $top_node = $this->state->stack_of_open_elements->current_node(); if ( isset( $top_node ) && ! $this->expects_closer( $top_node ) ) { $this->state->stack_of_open_elements->pop(); } } if ( self::PROCESS_NEXT_NODE === $node_to_process ) { parent::next_token(); if ( WP_HTML_Tag_Processor::STATE_TEXT_NODE === $this->parser_state ) { parent::subdivide_text_appropriately(); } } // Finish stepping when there are no more tokens in the document. if ( WP_HTML_Tag_Processor::STATE_INCOMPLETE_INPUT === $this->parser_state || WP_HTML_Tag_Processor::STATE_COMPLETE === $this->parser_state ) { return false; } $adjusted_current_node = $this->get_adjusted_current_node(); $is_closer = $this->is_tag_closer(); $is_start_tag = WP_HTML_Tag_Processor::STATE_MATCHED_TAG === $this->parser_state && ! $is_closer; $token_name = $this->get_token_name(); if ( self::REPROCESS_CURRENT_NODE !== $node_to_process ) { $this->state->current_token = new WP_HTML_Token( $this->bookmark_token(), $token_name, $this->has_self_closing_flag(), $this->release_internal_bookmark_on_destruct ); } $parse_in_current_insertion_mode = ( 0 === $this->state->stack_of_open_elements->count() || 'html' === $adjusted_current_node->namespace || ( 'math' === $adjusted_current_node->integration_node_type && ( ( $is_start_tag && ! in_array( $token_name, array( 'MGLYPH', 'MALIGNMARK' ), true ) ) || '#text' === $token_name ) ) || ( 'math' === $adjusted_current_node->namespace && 'ANNOTATION-XML' === $adjusted_current_node->node_name && $is_start_tag && 'SVG' === $token_name ) || ( 'html' === $adjusted_current_node->integration_node_type && ( $is_start_tag || '#text' === $token_name ) ) ); try { if ( ! $parse_in_current_insertion_mode ) { return $this->step_in_foreign_content(); } switch ( $this->state->insertion_mode ) { case WP_HTML_Processor_State::INSERTION_MODE_INITIAL: return $this->step_initial(); case WP_HTML_Processor_State::INSERTION_MODE_BEFORE_HTML: return $this->step_before_html(); case WP_HTML_Processor_State::INSERTION_MODE_BEFORE_HEAD: return $this->step_before_head(); case WP_HTML_Processor_State::INSERTION_MODE_IN_HEAD: return $this->step_in_head(); case WP_HTML_Processor_State::INSERTION_MODE_IN_HEAD_NOSCRIPT: return $this->step_in_head_noscript(); case WP_HTML_Processor_State::INSERTION_MODE_AFTER_HEAD: return $this->step_after_head(); case WP_HTML_Processor_State::INSERTION_MODE_IN_BODY: return $this->step_in_body(); case WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE: return $this->step_in_table(); case WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE_TEXT: return $this->step_in_table_text(); case WP_HTML_Processor_State::INSERTION_MODE_IN_CAPTION: return $this->step_in_caption(); case WP_HTML_Processor_State::INSERTION_MODE_IN_COLUMN_GROUP: return $this->step_in_column_group(); case WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE_BODY: return $this->step_in_table_body(); case WP_HTML_Processor_State::INSERTION_MODE_IN_ROW: return $this->step_in_row(); case WP_HTML_Processor_State::INSERTION_MODE_IN_CELL: return $this->step_in_cell(); case WP_HTML_Processor_State::INSERTION_MODE_IN_SELECT: return $this->step_in_select(); case WP_HTML_Processor_State::INSERTION_MODE_IN_SELECT_IN_TABLE: return $this->step_in_select_in_table(); case WP_HTML_Processor_State::INSERTION_MODE_IN_TEMPLATE: return $this->step_in_template(); case WP_HTML_Processor_State::INSERTION_MODE_AFTER_BODY: return $this->step_after_body(); case WP_HTML_Processor_State::INSERTION_MODE_IN_FRAMESET: return $this->step_in_frameset(); case WP_HTML_Processor_State::INSERTION_MODE_AFTER_FRAMESET: return $this->step_after_frameset(); case WP_HTML_Processor_State::INSERTION_MODE_AFTER_AFTER_BODY: return $this->step_after_after_body(); case WP_HTML_Processor_State::INSERTION_MODE_AFTER_AFTER_FRAMESET: return $this->step_after_after_frameset(); // This should be unreachable but PHP doesn't have total type checking on switch. default: $this->bail( "Unaware of the requested parsing mode: '{$this->state->insertion_mode}'." ); } } catch ( WP_HTML_Unsupported_Exception $e ) { /* * Exceptions are used in this class to escape deep call stacks that * otherwise might involve messier calling and return conventions. */ return false; } } /** * Computes the HTML breadcrumbs for the currently-matched node, if matched. * * Breadcrumbs start at the outermost parent and descend toward the matched element. * They always include the entire path from the root HTML node to the matched element. * * Example: * * $processor = WP_HTML_Processor::create_fragment( '<p><strong><em><img></em></strong></p>' ); * $processor->next_tag( 'IMG' ); * $processor->get_breadcrumbs() === array( 'HTML', 'BODY', 'P', 'STRONG', 'EM', 'IMG' ); * * @since 6.4.0 * * @return string[] Array of tag names representing path to matched node. */ public function get_breadcrumbs(): array { return $this->breadcrumbs; } /** * Returns the nesting depth of the current location in the document. * * Example: * * $processor = WP_HTML_Processor::create_fragment( '<div><p></p></div>' ); * // The processor starts in the BODY context, meaning it has depth from the start: HTML > BODY. * 2 === $processor->get_current_depth(); * * // Opening the DIV element increases the depth. * $processor->next_token(); * 3 === $processor->get_current_depth(); * * // Opening the P element increases the depth. * $processor->next_token(); * 4 === $processor->get_current_depth(); * * // The P element is closed during `next_token()` so the depth is decreased to reflect that. * $processor->next_token(); * 3 === $processor->get_current_depth(); * * @since 6.6.0 * * @return int Nesting-depth of current location in the document. */ public function get_current_depth(): int { return count( $this->breadcrumbs ); } /** * Normalizes an HTML fragment by serializing it. * * This method assumes that the given HTML snippet is found in BODY context. * For normalizing full documents or fragments found in other contexts, create * a new processor using {@see WP_HTML_Processor::create_fragment} or * {@see WP_HTML_Processor::create_full_parser} and call {@see WP_HTML_Processor::serialize} * on the created instances. * * Many aspects of an input HTML fragment may be changed during normalization. * * - Attribute values will be double-quoted. * - Duplicate attributes will be removed. * - Omitted tags will be added. * - Tag and attribute name casing will be lower-cased, * except for specific SVG and MathML tags or attributes. * - Text will be re-encoded, null bytes handled, * and invalid UTF-8 replaced with U+FFFD. * - Any incomplete syntax trailing at the end will be omitted, * for example, an unclosed comment opener will be removed. * * Example: * * echo WP_HTML_Processor::normalize( '<a href=#anchor v=5 href="/" enabled>One</a another v=5><!--' ); * // <a href="#anchor" v="5" enabled>One</a> * * echo WP_HTML_Processor::normalize( '<div></p>fun<table><td>cell</div>' ); * // <div><p></p>fun<table><tbody><tr><td>cell</td></tr></tbody></table></div> * * echo WP_HTML_Processor::normalize( '<![CDATA[invalid comment]]> syntax < <> "oddities"' ); * // <!--[CDATA[invalid comment]]--> syntax &lt; &lt;&gt; &quot;oddities&quot; * * @since 6.7.0 * * @param string $html Input HTML to normalize. * * @return string|null Normalized output, or `null` if unable to normalize. */ public static function normalize( string $html ): ?string { return static::create_fragment( $html )->serialize(); } /** * Returns normalized HTML for a fragment by serializing it. * * This differs from {@see WP_HTML_Processor::normalize} in that it starts with * a specific HTML Processor, which _must_ not have already started scanning; * it must be in the initial ready state and will be in the completed state once * serialization is complete. * * Many aspects of an input HTML fragment may be changed during normalization. * * - Attribute values will be double-quoted. * - Duplicate attributes will be removed. * - Omitted tags will be added. * - Tag and attribute name casing will be lower-cased, * except for specific SVG and MathML tags or attributes. * - Text will be re-encoded, null bytes handled, * and invalid UTF-8 replaced with U+FFFD. * - Any incomplete syntax trailing at the end will be omitted, * for example, an unclosed comment opener will be removed. * * Example: * * $processor = WP_HTML_Processor::create_fragment( '<a href=#anchor v=5 href="/" enabled>One</a another v=5><!--' ); * echo $processor->serialize(); * // <a href="#anchor" v="5" enabled>One</a> * * $processor = WP_HTML_Processor::create_fragment( '<div></p>fun<table><td>cell</div>' ); * echo $processor->serialize(); * // <div><p></p>fun<table><tbody><tr><td>cell</td></tr></tbody></table></div> * * $processor = WP_HTML_Processor::create_fragment( '<![CDATA[invalid comment]]> syntax < <> "oddities"' ); * echo $processor->serialize(); * // <!--[CDATA[invalid comment]]--> syntax &lt; &lt;&gt; &quot;oddities&quot; * * @since 6.7.0 * * @return string|null Normalized HTML markup represented by processor, * or `null` if unable to generate serialization. */ public function serialize(): ?string { if ( WP_HTML_Tag_Processor::STATE_READY !== $this->parser_state ) { wp_trigger_error( __METHOD__, 'An HTML Processor which has already started processing cannot serialize its contents. Serialize immediately after creating the instance.', E_USER_WARNING ); return null; } $html = ''; while ( $this->next_token() ) { $html .= $this->serialize_token(); } if ( null !== $this->get_last_error() ) { wp_trigger_error( __METHOD__, "Cannot serialize HTML Processor with parsing error: {$this->get_last_error()}.", E_USER_WARNING ); return null; } return $html; } /** * Serializes the currently-matched token. * * This method produces a fully-normative HTML string for the currently-matched token, * if able. If not matched at any token or if the token doesn't correspond to any HTML * it will return an empty string (for example, presumptuous end tags are ignored). * * @see static::serialize() * * @since 6.7.0 * @since 6.9.0 Converted from protected to public method. * * @return string Serialization of token, or empty string if no serialization exists. */ public function serialize_token(): string { $html = ''; $token_type = $this->get_token_type(); switch ( $token_type ) { case '#doctype': $doctype = $this->get_doctype_info(); if ( null === $doctype ) { break; } $html .= '<!DOCTYPE'; if ( $doctype->name ) { $html .= " {$doctype->name}"; } if ( null !== $doctype->public_identifier ) { $quote = str_contains( $doctype->public_identifier, '"' ) ? "'" : '"'; $html .= " PUBLIC {$quote}{$doctype->public_identifier}{$quote}"; } if ( null !== $doctype->system_identifier ) { if ( null === $doctype->public_identifier ) { $html .= ' SYSTEM'; } $quote = str_contains( $doctype->system_identifier, '"' ) ? "'" : '"'; $html .= " {$quote}{$doctype->system_identifier}{$quote}"; } $html .= '>'; break; case '#text': $html .= htmlspecialchars( $this->get_modifiable_text(), ENT_QUOTES | ENT_SUBSTITUTE | ENT_HTML5, 'UTF-8' ); break; // Unlike the `<>` which is interpreted as plaintext, this is ignored entirely. case '#presumptuous-tag': break; case '#funky-comment': case '#comment': $html .= "<!--{$this->get_full_comment_text()}-->"; break; case '#cdata-section': $html .= "<![CDATA[{$this->get_modifiable_text()}]]>"; break; } if ( '#tag' !== $token_type ) { return $html; } $tag_name = str_replace( "\x00", "\u{FFFD}", $this->get_tag() ); $in_html = 'html' === $this->get_namespace(); $qualified_name = $in_html ? strtolower( $tag_name ) : $this->get_qualified_tag_name(); if ( $this->is_tag_closer() ) { $html .= "</{$qualified_name}>"; return $html; } $attribute_names = $this->get_attribute_names_with_prefix( '' ); if ( ! isset( $attribute_names ) ) { $html .= "<{$qualified_name}>"; return $html; } $html .= "<{$qualified_name}"; foreach ( $attribute_names as $attribute_name ) { $html .= " {$this->get_qualified_attribute_name( $attribute_name )}"; $value = $this->get_attribute( $attribute_name ); if ( is_string( $value ) ) { $html .= '="' . htmlspecialchars( $value, ENT_QUOTES | ENT_SUBSTITUTE | ENT_HTML5 ) . '"'; } $html = str_replace( "\x00", "\u{FFFD}", $html ); } if ( ! $in_html && $this->has_self_closing_flag() ) { $html .= ' /'; } $html .= '>'; // Flush out self-contained elements. if ( $in_html && in_array( $tag_name, array( 'IFRAME', 'NOEMBED', 'NOFRAMES', 'SCRIPT', 'STYLE', 'TEXTAREA', 'TITLE', 'XMP' ), true ) ) { $text = $this->get_modifiable_text(); switch ( $tag_name ) { case 'IFRAME': case 'NOEMBED': case 'NOFRAMES': $text = ''; break; case 'SCRIPT': case 'STYLE': break; default: $text = htmlspecialchars( $text, ENT_QUOTES | ENT_SUBSTITUTE | ENT_HTML5, 'UTF-8' ); } $html .= "{$text}</{$qualified_name}>"; } return $html; } /** * Parses next element in the 'initial' insertion mode. * * This internal function performs the 'initial' insertion mode * logic for the generalized WP_HTML_Processor::step() function. * * @since 6.7.0 * * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. * * @see https://html.spec.whatwg.org/#the-initial-insertion-mode * @see WP_HTML_Processor::step * * @return bool Whether an element was found. */ private function step_initial(): bool { $token_name = $this->get_token_name(); $token_type = $this->get_token_type(); $op_sigil = '#tag' === $token_type ? ( parent::is_tag_closer() ? '-' : '+' ) : ''; $op = "{$op_sigil}{$token_name}"; switch ( $op ) { /* * > A character token that is one of U+0009 CHARACTER TABULATION, * > U+000A LINE FEED (LF), U+000C FORM FEED (FF), * > U+000D CARRIAGE RETURN (CR), or U+0020 SPACE * * Parse error: ignore the token. */ case '#text': if ( parent::TEXT_IS_WHITESPACE === $this->text_node_classification ) { return $this->step(); } goto initial_anything_else; break; /* * > A comment token */ case '#comment': case '#funky-comment': case '#presumptuous-tag': $this->insert_html_element( $this->state->current_token ); return true; /* * > A DOCTYPE token */ case 'html': $doctype = $this->get_doctype_info(); if ( null !== $doctype && 'quirks' === $doctype->indicated_compatibility_mode ) { $this->compat_mode = WP_HTML_Tag_Processor::QUIRKS_MODE; } /* * > Then, switch the insertion mode to "before html". */ $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_BEFORE_HTML; $this->insert_html_element( $this->state->current_token ); return true; } /* * > Anything else */ initial_anything_else: $this->compat_mode = WP_HTML_Tag_Processor::QUIRKS_MODE; $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_BEFORE_HTML; return $this->step( self::REPROCESS_CURRENT_NODE ); } /** * Parses next element in the 'before html' insertion mode. * * This internal function performs the 'before html' insertion mode * logic for the generalized WP_HTML_Processor::step() function. * * @since 6.7.0 * * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. * * @see https://html.spec.whatwg.org/#the-before-html-insertion-mode * @see WP_HTML_Processor::step * * @return bool Whether an element was found. */ private function step_before_html(): bool { $token_name = $this->get_token_name(); $token_type = $this->get_token_type(); $is_closer = parent::is_tag_closer(); $op_sigil = '#tag' === $token_type ? ( $is_closer ? '-' : '+' ) : ''; $op = "{$op_sigil}{$token_name}"; switch ( $op ) { /* * > A DOCTYPE token */ case 'html': // Parse error: ignore the token. return $this->step(); /* * > A comment token */ case '#comment': case '#funky-comment': case '#presumptuous-tag': $this->insert_html_element( $this->state->current_token ); return true; /* * > A character token that is one of U+0009 CHARACTER TABULATION, * > U+000A LINE FEED (LF), U+000C FORM FEED (FF), * > U+000D CARRIAGE RETURN (CR), or U+0020 SPACE * * Parse error: ignore the token. */ case '#text': if ( parent::TEXT_IS_WHITESPACE === $this->text_node_classification ) { return $this->step(); } goto before_html_anything_else; break; /* * > A start tag whose tag name is "html" */ case '+HTML': $this->insert_html_element( $this->state->current_token ); $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_BEFORE_HEAD; return true; /* * > An end tag whose tag name is one of: "head", "body", "html", "br" * * Closing BR tags are always reported by the Tag Processor as opening tags. */ case '-HEAD': case '-BODY': case '-HTML': /* * > Act as described in the "anything else" entry below. */ goto before_html_anything_else; break; } /* * > Any other end tag */ if ( $is_closer ) { // Parse error: ignore the token. return $this->step(); } /* * > Anything else. * * > Create an html element whose node document is the Document object. * > Append it to the Document object. Put this element in the stack of open elements. * > Switch the insertion mode to "before head", then reprocess the token. */ before_html_anything_else: $this->insert_virtual_node( 'HTML' ); $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_BEFORE_HEAD; return $this->step( self::REPROCESS_CURRENT_NODE ); } /** * Parses next element in the 'before head' insertion mode. * * This internal function performs the 'before head' insertion mode * logic for the generalized WP_HTML_Processor::step() function. * * @since 6.7.0 Stub implementation. * * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. * * @see https://html.spec.whatwg.org/#the-before-head-insertion-mode * @see WP_HTML_Processor::step * * @return bool Whether an element was found. */ private function step_before_head(): bool { $token_name = $this->get_token_name(); $token_type = $this->get_token_type(); $is_closer = parent::is_tag_closer(); $op_sigil = '#tag' === $token_type ? ( $is_closer ? '-' : '+' ) : ''; $op = "{$op_sigil}{$token_name}"; switch ( $op ) { /* * > A character token that is one of U+0009 CHARACTER TABULATION, * > U+000A LINE FEED (LF), U+000C FORM FEED (FF), * > U+000D CARRIAGE RETURN (CR), or U+0020 SPACE * * Parse error: ignore the token. */ case '#text': if ( parent::TEXT_IS_WHITESPACE === $this->text_node_classification ) { return $this->step(); } goto before_head_anything_else; break; /* * > A comment token */ case '#comment': case '#funky-comment': case '#presumptuous-tag': $this->insert_html_element( $this->state->current_token ); return true; /* * > A DOCTYPE token */ case 'html': // Parse error: ignore the token. return $this->step(); /* * > A start tag whose tag name is "html" */ case '+HTML': return $this->step_in_body(); /* * > A start tag whose tag name is "head" */ case '+HEAD': $this->insert_html_element( $this->state->current_token ); $this->state->head_element = $this->state->current_token; $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_HEAD; return true; /* * > An end tag whose tag name is one of: "head", "body", "html", "br" * > Act as described in the "anything else" entry below. * * Closing BR tags are always reported by the Tag Processor as opening tags. */ case '-HEAD': case '-BODY': case '-HTML': goto before_head_anything_else; break; } if ( $is_closer ) { // Parse error: ignore the token. return $this->step(); } /* * > Anything else * * > Insert an HTML element for a "head" start tag token with no attributes. */ before_head_anything_else: $this->state->head_element = $this->insert_virtual_node( 'HEAD' ); $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_HEAD; return $this->step( self::REPROCESS_CURRENT_NODE ); } /** * Parses next element in the 'in head' insertion mode. * * This internal function performs the 'in head' insertion mode * logic for the generalized WP_HTML_Processor::step() function. * * @since 6.7.0 * * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. * * @see https://html.spec.whatwg.org/multipage/parsing.html#parsing-main-inhead * @see WP_HTML_Processor::step * * @return bool Whether an element was found. */ private function step_in_head(): bool { $token_name = $this->get_token_name(); $token_type = $this->get_token_type(); $is_closer = parent::is_tag_closer(); $op_sigil = '#tag' === $token_type ? ( $is_closer ? '-' : '+' ) : ''; $op = "{$op_sigil}{$token_name}"; switch ( $op ) { case '#text': /* * > A character token that is one of U+0009 CHARACTER TABULATION, * > U+000A LINE FEED (LF), U+000C FORM FEED (FF), * > U+000D CARRIAGE RETURN (CR), or U+0020 SPACE */ if ( parent::TEXT_IS_WHITESPACE === $this->text_node_classification ) { // Insert the character. $this->insert_html_element( $this->state->current_token ); return true; } goto in_head_anything_else; break; /* * > A comment token */ case '#comment': case '#funky-comment': case '#presumptuous-tag': $this->insert_html_element( $this->state->current_token ); return true; /* * > A DOCTYPE token */ case 'html': // Parse error: ignore the token. return $this->step(); /* * > A start tag whose tag name is "html" */ case '+HTML': return $this->step_in_body(); /* * > A start tag whose tag name is one of: "base", "basefont", "bgsound", "link" */ case '+BASE': case '+BASEFONT': case '+BGSOUND': case '+LINK': $this->insert_html_element( $this->state->current_token ); return true; /* * > A start tag whose tag name is "meta" */ case '+META': $this->insert_html_element( $this->state->current_token ); // All following conditions depend on "tentative" encoding confidence. if ( 'tentative' !== $this->state->encoding_confidence ) { return true; } /* * > If the active speculative HTML parser is null, then: * > - If the element has a charset attribute, and getting an encoding from * > its value results in an encoding, and the confidence is currently * > tentative, then change the encoding to the resulting encoding. */ $charset = $this->get_attribute( 'charset' ); if ( is_string( $charset ) ) { $this->bail( 'Cannot yet process META tags with charset to determine encoding.' ); } /* * > - Otherwise, if the element has an http-equiv attribute whose value is * > an ASCII case-insensitive match for the string "Content-Type", and * > the element has a content attribute, and applying the algorithm for * > extracting a character encoding from a meta element to that attribute's * > value returns an encoding, and the confidence is currently tentative, * > then change the encoding to the extracted encoding. */ $http_equiv = $this->get_attribute( 'http-equiv' ); $content = $this->get_attribute( 'content' ); if ( is_string( $http_equiv ) && is_string( $content ) && 0 === strcasecmp( $http_equiv, 'Content-Type' ) ) { $this->bail( 'Cannot yet process META tags with http-equiv Content-Type to determine encoding.' ); } return true; /* * > A start tag whose tag name is "title" */ case '+TITLE': $this->insert_html_element( $this->state->current_token ); return true; /* * > A start tag whose tag name is "noscript", if the scripting flag is enabled * > A start tag whose tag name is one of: "noframes", "style" * * The scripting flag is never enabled in this parser. */ case '+NOFRAMES': case '+STYLE': $this->insert_html_element( $this->state->current_token ); return true; /* * > A start tag whose tag name is "noscript", if the scripting flag is disabled */ case '+NOSCRIPT': $this->insert_html_element( $this->state->current_token ); $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_HEAD_NOSCRIPT; return true; /* * > A start tag whose tag name is "script" * * @todo Could the adjusted insertion location be anything other than the current location? */ case '+SCRIPT': $this->insert_html_element( $this->state->current_token ); return true; /* * > An end tag whose tag name is "head" */ case '-HEAD': $this->state->stack_of_open_elements->pop(); $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_AFTER_HEAD; return true; /* * > An end tag whose tag name is one of: "body", "html", "br" * * BR tags are always reported by the Tag Processor as opening tags. */ case '-BODY': case '-HTML': /* * > Act as described in the "anything else" entry below. */ goto in_head_anything_else; break; /* * > A start tag whose tag name is "template" * * @todo Could the adjusted insertion location be anything other than the current location? */ case '+TEMPLATE': $this->state->active_formatting_elements->insert_marker(); $this->state->frameset_ok = false; $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TEMPLATE; $this->state->stack_of_template_insertion_modes[] = WP_HTML_Processor_State::INSERTION_MODE_IN_TEMPLATE; $this->insert_html_element( $this->state->current_token ); return true; /* * > An end tag whose tag name is "template" */ case '-TEMPLATE': if ( ! $this->state->stack_of_open_elements->contains( 'TEMPLATE' ) ) { // @todo Indicate a parse error once it's possible. return $this->step(); } $this->generate_implied_end_tags_thoroughly(); if ( ! $this->state->stack_of_open_elements->current_node_is( 'TEMPLATE' ) ) { // @todo Indicate a parse error once it's possible. } $this->state->stack_of_open_elements->pop_until( 'TEMPLATE' ); $this->state->active_formatting_elements->clear_up_to_last_marker(); array_pop( $this->state->stack_of_template_insertion_modes ); $this->reset_insertion_mode_appropriately(); return true; } /* * > A start tag whose tag name is "head" * > Any other end tag */ if ( '+HEAD' === $op || $is_closer ) { // Parse error: ignore the token. return $this->step(); } /* * > Anything else */ in_head_anything_else: $this->state->stack_of_open_elements->pop(); $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_AFTER_HEAD; return $this->step( self::REPROCESS_CURRENT_NODE ); } /** * Parses next element in the 'in head noscript' insertion mode. * * This internal function performs the 'in head noscript' insertion mode * logic for the generalized WP_HTML_Processor::step() function. * * @since 6.7.0 Stub implementation. * * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. * * @see https://html.spec.whatwg.org/#parsing-main-inheadnoscript * @see WP_HTML_Processor::step * * @return bool Whether an element was found. */ private function step_in_head_noscript(): bool { $token_name = $this->get_token_name(); $token_type = $this->get_token_type(); $is_closer = parent::is_tag_closer(); $op_sigil = '#tag' === $token_type ? ( $is_closer ? '-' : '+' ) : ''; $op = "{$op_sigil}{$token_name}"; switch ( $op ) { /* * > A character token that is one of U+0009 CHARACTER TABULATION, * > U+000A LINE FEED (LF), U+000C FORM FEED (FF), * > U+000D CARRIAGE RETURN (CR), or U+0020 SPACE * * Parse error: ignore the token. */ case '#text': if ( parent::TEXT_IS_WHITESPACE === $this->text_node_classification ) { return $this->step_in_head(); } goto in_head_noscript_anything_else; break; /* * > A DOCTYPE token */ case 'html': // Parse error: ignore the token. return $this->step(); /* * > A start tag whose tag name is "html" */ case '+HTML': return $this->step_in_body(); /* * > An end tag whose tag name is "noscript" */ case '-NOSCRIPT': $this->state->stack_of_open_elements->pop(); $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_HEAD; return true; /* * > A comment token * > * > A start tag whose tag name is one of: "basefont", "bgsound", * > "link", "meta", "noframes", "style" */ case '#comment': case '#funky-comment': case '#presumptuous-tag': case '+BASEFONT': case '+BGSOUND': case '+LINK': case '+META': case '+NOFRAMES': case '+STYLE': return $this->step_in_head(); /* * > An end tag whose tag name is "br" * * This should never happen, as the Tag Processor prevents showing a BR closing tag. */ } /* * > A start tag whose tag name is one of: "head", "noscript" * > Any other end tag */ if ( '+HEAD' === $op || '+NOSCRIPT' === $op || $is_closer ) { // Parse error: ignore the token. return $this->step(); } /* * > Anything else * * Anything here is a parse error. */ in_head_noscript_anything_else: $this->state->stack_of_open_elements->pop(); $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_HEAD; return $this->step( self::REPROCESS_CURRENT_NODE ); } /** * Parses next element in the 'after head' insertion mode. * * This internal function performs the 'after head' insertion mode * logic for the generalized WP_HTML_Processor::step() function. * * @since 6.7.0 Stub implementation. * * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. * * @see https://html.spec.whatwg.org/#the-after-head-insertion-mode * @see WP_HTML_Processor::step * * @return bool Whether an element was found. */ private function step_after_head(): bool { $token_name = $this->get_token_name(); $token_type = $this->get_token_type(); $is_closer = parent::is_tag_closer(); $op_sigil = '#tag' === $token_type ? ( $is_closer ? '-' : '+' ) : ''; $op = "{$op_sigil}{$token_name}"; switch ( $op ) { /* * > A character token that is one of U+0009 CHARACTER TABULATION, * > U+000A LINE FEED (LF), U+000C FORM FEED (FF), * > U+000D CARRIAGE RETURN (CR), or U+0020 SPACE */ case '#text': if ( parent::TEXT_IS_WHITESPACE === $this->text_node_classification ) { // Insert the character. $this->insert_html_element( $this->state->current_token ); return true; } goto after_head_anything_else; break; /* * > A comment token */ case '#comment': case '#funky-comment': case '#presumptuous-tag': $this->insert_html_element( $this->state->current_token ); return true; /* * > A DOCTYPE token */ case 'html': // Parse error: ignore the token. return $this->step(); /* * > A start tag whose tag name is "html" */ case '+HTML': return $this->step_in_body(); /* * > A start tag whose tag name is "body" */ case '+BODY': $this->insert_html_element( $this->state->current_token ); $this->state->frameset_ok = false; $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_BODY; return true; /* * > A start tag whose tag name is "frameset" */ case '+FRAMESET': $this->insert_html_element( $this->state->current_token ); $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_FRAMESET; return true; /* * > A start tag whose tag name is one of: "base", "basefont", "bgsound", * > "link", "meta", "noframes", "script", "style", "template", "title" * * Anything here is a parse error. */ case '+BASE': case '+BASEFONT': case '+BGSOUND': case '+LINK': case '+META': case '+NOFRAMES': case '+SCRIPT': case '+STYLE': case '+TEMPLATE': case '+TITLE': /* * > Push the node pointed to by the head element pointer onto the stack of open elements. * > Process the token using the rules for the "in head" insertion mode. * > Remove the node pointed to by the head element pointer from the stack of open elements. (It might not be the current node at this point.) */ $this->bail( 'Cannot process elements after HEAD which reopen the HEAD element.' ); /* * Do not leave this break in when adding support; it's here to prevent * WPCS from getting confused at the switch structure without a return, * because it doesn't know that `bail()` always throws. */ break; /* * > An end tag whose tag name is "template" */ case '-TEMPLATE': return $this->step_in_head(); /* * > An end tag whose tag name is one of: "body", "html", "br" * * Closing BR tags are always reported by the Tag Processor as opening tags. */ case '-BODY': case '-HTML': /* * > Act as described in the "anything else" entry below. */ goto after_head_anything_else; break; } /* * > A start tag whose tag name is "head" * > Any other end tag */ if ( '+HEAD' === $op || $is_closer ) { // Parse error: ignore the token. return $this->step(); } /* * > Anything else * > Insert an HTML element for a "body" start tag token with no attributes. */ after_head_anything_else: $this->insert_virtual_node( 'BODY' ); $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_BODY; return $this->step( self::REPROCESS_CURRENT_NODE ); } /** * Parses next element in the 'in body' insertion mode. * * This internal function performs the 'in body' insertion mode * logic for the generalized WP_HTML_Processor::step() function. * * @since 6.4.0 * * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. * * @see https://html.spec.whatwg.org/#parsing-main-inbody * @see WP_HTML_Processor::step * * @return bool Whether an element was found. */ private function step_in_body(): bool { $token_name = $this->get_token_name(); $token_type = $this->get_token_type(); $op_sigil = '#tag' === $token_type ? ( parent::is_tag_closer() ? '-' : '+' ) : ''; $op = "{$op_sigil}{$token_name}"; switch ( $op ) { case '#text': /* * > A character token that is U+0000 NULL * * Any successive sequence of NULL bytes is ignored and won't * trigger active format reconstruction. Therefore, if the text * only comprises NULL bytes then the token should be ignored * here, but if there are any other characters in the stream * the active formats should be reconstructed. */ if ( parent::TEXT_IS_NULL_SEQUENCE === $this->text_node_classification ) { // Parse error: ignore the token. return $this->step(); } $this->reconstruct_active_formatting_elements(); /* * Whitespace-only text does not affect the frameset-ok flag. * It is probably inter-element whitespace, but it may also * contain character references which decode only to whitespace. */ if ( parent::TEXT_IS_GENERIC === $this->text_node_classification ) { $this->state->frameset_ok = false; } $this->insert_html_element( $this->state->current_token ); return true; case '#comment': case '#funky-comment': case '#presumptuous-tag': $this->insert_html_element( $this->state->current_token ); return true; /* * > A DOCTYPE token * > Parse error. Ignore the token. */ case 'html': return $this->step(); /* * > A start tag whose tag name is "html" */ case '+HTML': if ( ! $this->state->stack_of_open_elements->contains( 'TEMPLATE' ) ) { /* * > Otherwise, for each attribute on the token, check to see if the attribute * > is already present on the top element of the stack of open elements. If * > it is not, add the attribute and its corresponding value to that element. * * This parser does not currently support this behavior: ignore the token. */ } // Ignore the token. return $this->step(); /* * > A start tag whose tag name is one of: "base", "basefont", "bgsound", "link", * > "meta", "noframes", "script", "style", "template", "title" * > * > An end tag whose tag name is "template" */ case '+BASE': case '+BASEFONT': case '+BGSOUND': case '+LINK': case '+META': case '+NOFRAMES': case '+SCRIPT': case '+STYLE': case '+TEMPLATE': case '+TITLE': case '-TEMPLATE': return $this->step_in_head(); /* * > A start tag whose tag name is "body" * * This tag in the IN BODY insertion mode is a parse error. */ case '+BODY': if ( 1 === $this->state->stack_of_open_elements->count() || 'BODY' !== ( $this->state->stack_of_open_elements->at( 2 )->node_name ?? null ) || $this->state->stack_of_open_elements->contains( 'TEMPLATE' ) ) { // Ignore the token. return $this->step(); } /* * > Otherwise, set the frameset-ok flag to "not ok"; then, for each attribute * > on the token, check to see if the attribute is already present on the body * > element (the second element) on the stack of open elements, and if it is * > not, add the attribute and its corresponding value to that element. * * This parser does not currently support this behavior: ignore the token. */ $this->state->frameset_ok = false; return $this->step(); /* * > A start tag whose tag name is "frameset" * * This tag in the IN BODY insertion mode is a parse error. */ case '+FRAMESET': if ( 1 === $this->state->stack_of_open_elements->count() || 'BODY' !== ( $this->state->stack_of_open_elements->at( 2 )->node_name ?? null ) || false === $this->state->frameset_ok ) { // Ignore the token. return $this->step(); } /* * > Otherwise, run the following steps: */ $this->bail( 'Cannot process non-ignored FRAMESET tags.' ); break; /* * > An end tag whose tag name is "body" */ case '-BODY': if ( ! $this->state->stack_of_open_elements->has_element_in_scope( 'BODY' ) ) { // Parse error: ignore the token. return $this->step(); } /* * > Otherwise, if there is a node in the stack of open elements that is not either a * > dd element, a dt element, an li element, an optgroup element, an option element, * > a p element, an rb element, an rp element, an rt element, an rtc element, a tbody * > element, a td element, a tfoot element, a th element, a thread element, a tr * > element, the body element, or the html element, then this is a parse error. * * There is nothing to do for this parse error, so don't check for it. */ $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_AFTER_BODY; /* * The BODY element is not removed from the stack of open elements. * Only internal state has changed, this does not qualify as a "step" * in terms of advancing through the document to another token. * Nothing has been pushed or popped. * Proceed to parse the next item. */ return $this->step(); /* * > An end tag whose tag name is "html" */ case '-HTML': if ( ! $this->state->stack_of_open_elements->has_element_in_scope( 'BODY' ) ) { // Parse error: ignore the token. return $this->step(); } /* * > Otherwise, if there is a node in the stack of open elements that is not either a * > dd element, a dt element, an li element, an optgroup element, an option element, * > a p element, an rb element, an rp element, an rt element, an rtc element, a tbody * > element, a td element, a tfoot element, a th element, a thread element, a tr * > element, the body element, or the html element, then this is a parse error. * * There is nothing to do for this parse error, so don't check for it. */ $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_AFTER_BODY; return $this->step( self::REPROCESS_CURRENT_NODE ); /* * > A start tag whose tag name is one of: "address", "article", "aside", * > "blockquote", "center", "details", "dialog", "dir", "div", "dl", * > "fieldset", "figcaption", "figure", "footer", "header", "hgroup", * > "main", "menu", "nav", "ol", "p", "search", "section", "summary", "ul" */ case '+ADDRESS': case '+ARTICLE': case '+ASIDE': case '+BLOCKQUOTE': case '+CENTER': case '+DETAILS': case '+DIALOG': case '+DIR': case '+DIV': case '+DL': case '+FIELDSET': case '+FIGCAPTION': case '+FIGURE': case '+FOOTER': case '+HEADER': case '+HGROUP': case '+MAIN': case '+MENU': case '+NAV': case '+OL': case '+P': case '+SEARCH': case '+SECTION': case '+SUMMARY': case '+UL': if ( $this->state->stack_of_open_elements->has_p_in_button_scope() ) { $this->close_a_p_element(); } $this->insert_html_element( $this->state->current_token ); return true; /* * > A start tag whose tag name is one of: "h1", "h2", "h3", "h4", "h5", "h6" */ case '+H1': case '+H2': case '+H3': case '+H4': case '+H5': case '+H6': if ( $this->state->stack_of_open_elements->has_p_in_button_scope() ) { $this->close_a_p_element(); } if ( in_array( $this->state->stack_of_open_elements->current_node()->node_name, array( 'H1', 'H2', 'H3', 'H4', 'H5', 'H6' ), true ) ) { // @todo Indicate a parse error once it's possible. $this->state->stack_of_open_elements->pop(); } $this->insert_html_element( $this->state->current_token ); return true; /* * > A start tag whose tag name is one of: "pre", "listing" */ case '+PRE': case '+LISTING': if ( $this->state->stack_of_open_elements->has_p_in_button_scope() ) { $this->close_a_p_element(); } /* * > If the next token is a U+000A LINE FEED (LF) character token, * > then ignore that token and move on to the next one. (Newlines * > at the start of pre blocks are ignored as an authoring convenience.) * * This is handled in `get_modifiable_text()`. */ $this->insert_html_element( $this->state->current_token ); $this->state->frameset_ok = false; return true; /* * > A start tag whose tag name is "form" */ case '+FORM': $stack_contains_template = $this->state->stack_of_open_elements->contains( 'TEMPLATE' ); if ( isset( $this->state->form_element ) && ! $stack_contains_template ) { // Parse error: ignore the token. return $this->step(); } if ( $this->state->stack_of_open_elements->has_p_in_button_scope() ) { $this->close_a_p_element(); } $this->insert_html_element( $this->state->current_token ); if ( ! $stack_contains_template ) { $this->state->form_element = $this->state->current_token; } return true; /* * > A start tag whose tag name is "li" * > A start tag whose tag name is one of: "dd", "dt" */ case '+DD': case '+DT': case '+LI': $this->state->frameset_ok = false; $node = $this->state->stack_of_open_elements->current_node(); $is_li = 'LI' === $token_name; in_body_list_loop: /* * The logic for LI and DT/DD is the same except for one point: LI elements _only_ * close other LI elements, but a DT or DD element closes _any_ open DT or DD element. */ if ( $is_li ? 'LI' === $node->node_name : ( 'DD' === $node->node_name || 'DT' === $node->node_name ) ) { $node_name = $is_li ? 'LI' : $node->node_name; $this->generate_implied_end_tags( $node_name ); if ( ! $this->state->stack_of_open_elements->current_node_is( $node_name ) ) { // @todo Indicate a parse error once it's possible. This error does not impact the logic here. } $this->state->stack_of_open_elements->pop_until( $node_name ); goto in_body_list_done; } if ( 'ADDRESS' !== $node->node_name && 'DIV' !== $node->node_name && 'P' !== $node->node_name && self::is_special( $node ) ) { /* * > If node is in the special category, but is not an address, div, * > or p element, then jump to the step labeled done below. */ goto in_body_list_done; } else { /* * > Otherwise, set node to the previous entry in the stack of open elements * > and return to the step labeled loop. */ foreach ( $this->state->stack_of_open_elements->walk_up( $node ) as $item ) { $node = $item; break; } goto in_body_list_loop; } in_body_list_done: if ( $this->state->stack_of_open_elements->has_p_in_button_scope() ) { $this->close_a_p_element(); } $this->insert_html_element( $this->state->current_token ); return true; case '+PLAINTEXT': if ( $this->state->stack_of_open_elements->has_p_in_button_scope() ) { $this->close_a_p_element(); } /* * @todo This may need to be handled in the Tag Processor and turn into * a single self-contained tag like TEXTAREA, whose modifiable text * is the rest of the input document as plaintext. */ $this->bail( 'Cannot process PLAINTEXT elements.' ); break; /* * > A start tag whose tag name is "button" */ case '+BUTTON': if ( $this->state->stack_of_open_elements->has_element_in_scope( 'BUTTON' ) ) { // @todo Indicate a parse error once it's possible. This error does not impact the logic here. $this->generate_implied_end_tags(); $this->state->stack_of_open_elements->pop_until( 'BUTTON' ); } $this->reconstruct_active_formatting_elements(); $this->insert_html_element( $this->state->current_token ); $this->state->frameset_ok = false; return true; /* * > An end tag whose tag name is one of: "address", "article", "aside", "blockquote", * > "button", "center", "details", "dialog", "dir", "div", "dl", "fieldset", * > "figcaption", "figure", "footer", "header", "hgroup", "listing", "main", * > "menu", "nav", "ol", "pre", "search", "section", "summary", "ul" */ case '-ADDRESS': case '-ARTICLE': case '-ASIDE': case '-BLOCKQUOTE': case '-BUTTON': case '-CENTER': case '-DETAILS': case '-DIALOG': case '-DIR': case '-DIV': case '-DL': case '-FIELDSET': case '-FIGCAPTION': case '-FIGURE': case '-FOOTER': case '-HEADER': case '-HGROUP': case '-LISTING': case '-MAIN': case '-MENU': case '-NAV': case '-OL': case '-PRE': case '-SEARCH': case '-SECTION': case '-SUMMARY': case '-UL': if ( ! $this->state->stack_of_open_elements->has_element_in_scope( $token_name ) ) { // @todo Report parse error. // Ignore the token. return $this->step(); } $this->generate_implied_end_tags(); if ( ! $this->state->stack_of_open_elements->current_node_is( $token_name ) ) { // @todo Record parse error: this error doesn't impact parsing. } $this->state->stack_of_open_elements->pop_until( $token_name ); return true; /* * > An end tag whose tag name is "form" */ case '-FORM': if ( ! $this->state->stack_of_open_elements->contains( 'TEMPLATE' ) ) { $node = $this->state->form_element; $this->state->form_element = null; /* * > If node is null or if the stack of open elements does not have node * > in scope, then this is a parse error; return and ignore the token. * * @todo It's necessary to check if the form token itself is in scope, not * simply whether any FORM is in scope. */ if ( null === $node || ! $this->state->stack_of_open_elements->has_element_in_scope( 'FORM' ) ) { // Parse error: ignore the token. return $this->step(); } $this->generate_implied_end_tags(); if ( $node !== $this->state->stack_of_open_elements->current_node() ) { // @todo Indicate a parse error once it's possible. This error does not impact the logic here. $this->bail( 'Cannot close a FORM when other elements remain open as this would throw off the breadcrumbs for the following tokens.' ); } $this->state->stack_of_open_elements->remove_node( $node ); return true; } else { /* * > If the stack of open elements does not have a form element in scope, * > then this is a parse error; return and ignore the token. * * Note that unlike in the clause above, this is checking for any FORM in scope. */ if ( ! $this->state->stack_of_open_elements->has_element_in_scope( 'FORM' ) ) { // Parse error: ignore the token. return $this->step(); } $this->generate_implied_end_tags(); if ( ! $this->state->stack_of_open_elements->current_node_is( 'FORM' ) ) { // @todo Indicate a parse error once it's possible. This error does not impact the logic here. } $this->state->stack_of_open_elements->pop_until( 'FORM' ); return true; } break; /* * > An end tag whose tag name is "p" */ case '-P': if ( ! $this->state->stack_of_open_elements->has_p_in_button_scope() ) { $this->insert_html_element( $this->state->current_token ); } $this->close_a_p_element(); return true; /* * > An end tag whose tag name is "li" * > An end tag whose tag name is one of: "dd", "dt" */ case '-DD': case '-DT': case '-LI': if ( /* * An end tag whose tag name is "li": * If the stack of open elements does not have an li element in list item scope, * then this is a parse error; ignore the token. */ ( 'LI' === $token_name && ! $this->state->stack_of_open_elements->has_element_in_list_item_scope( 'LI' ) ) || /* * An end tag whose tag name is one of: "dd", "dt": * If the stack of open elements does not have an element in scope that is an * HTML element with the same tag name as that of the token, then this is a * parse error; ignore the token. */ ( 'LI' !== $token_name && ! $this->state->stack_of_open_elements->has_element_in_scope( $token_name ) ) ) { /* * This is a parse error, ignore the token. * * @todo Indicate a parse error once it's possible. */ return $this->step(); } $this->generate_implied_end_tags( $token_name ); if ( ! $this->state->stack_of_open_elements->current_node_is( $token_name ) ) { // @todo Indicate a parse error once it's possible. This error does not impact the logic here. } $this->state->stack_of_open_elements->pop_until( $token_name ); return true; /* * > An end tag whose tag name is one of: "h1", "h2", "h3", "h4", "h5", "h6" */ case '-H1': case '-H2': case '-H3': case '-H4': case '-H5': case '-H6': if ( ! $this->state->stack_of_open_elements->has_element_in_scope( '(internal: H1 through H6 - do not use)' ) ) { /* * This is a parse error; ignore the token. * * @todo Indicate a parse error once it's possible. */ return $this->step(); } $this->generate_implied_end_tags(); if ( ! $this->state->stack_of_open_elements->current_node_is( $token_name ) ) { // @todo Record parse error: this error doesn't impact parsing. } $this->state->stack_of_open_elements->pop_until( '(internal: H1 through H6 - do not use)' ); return true; /* * > A start tag whose tag name is "a" */ case '+A': foreach ( $this->state->active_formatting_elements->walk_up() as $item ) { switch ( $item->node_name ) { case 'marker': break 2; case 'A': $this->run_adoption_agency_algorithm(); $this->state->active_formatting_elements->remove_node( $item ); $this->state->stack_of_open_elements->remove_node( $item ); break 2; } } $this->reconstruct_active_formatting_elements(); $this->insert_html_element( $this->state->current_token ); $this->state->active_formatting_elements->push( $this->state->current_token ); return true; /* * > A start tag whose tag name is one of: "b", "big", "code", "em", "font", "i", * > "s", "small", "strike", "strong", "tt", "u" */ case '+B': case '+BIG': case '+CODE': case '+EM': case '+FONT': case '+I': case '+S': case '+SMALL': case '+STRIKE': case '+STRONG': case '+TT': case '+U': $this->reconstruct_active_formatting_elements(); $this->insert_html_element( $this->state->current_token ); $this->state->active_formatting_elements->push( $this->state->current_token ); return true; /* * > A start tag whose tag name is "nobr" */ case '+NOBR': $this->reconstruct_active_formatting_elements(); if ( $this->state->stack_of_open_elements->has_element_in_scope( 'NOBR' ) ) { // Parse error. $this->run_adoption_agency_algorithm(); $this->reconstruct_active_formatting_elements(); } $this->insert_html_element( $this->state->current_token ); $this->state->active_formatting_elements->push( $this->state->current_token ); return true; /* * > An end tag whose tag name is one of: "a", "b", "big", "code", "em", "font", "i", * > "nobr", "s", "small", "strike", "strong", "tt", "u" */ case '-A': case '-B': case '-BIG': case '-CODE': case '-EM': case '-FONT': case '-I': case '-NOBR': case '-S': case '-SMALL': case '-STRIKE': case '-STRONG': case '-TT': case '-U': $this->run_adoption_agency_algorithm(); return true; /* * > A start tag whose tag name is one of: "applet", "marquee", "object" */ case '+APPLET': case '+MARQUEE': case '+OBJECT': $this->reconstruct_active_formatting_elements(); $this->insert_html_element( $this->state->current_token ); $this->state->active_formatting_elements->insert_marker(); $this->state->frameset_ok = false; return true; /* * > A end tag token whose tag name is one of: "applet", "marquee", "object" */ case '-APPLET': case '-MARQUEE': case '-OBJECT': if ( ! $this->state->stack_of_open_elements->has_element_in_scope( $token_name ) ) { // Parse error: ignore the token. return $this->step(); } $this->generate_implied_end_tags(); if ( ! $this->state->stack_of_open_elements->current_node_is( $token_name ) ) { // This is a parse error. } $this->state->stack_of_open_elements->pop_until( $token_name ); $this->state->active_formatting_elements->clear_up_to_last_marker(); return true; /* * > A start tag whose tag name is "table" */ case '+TABLE': /* * > If the Document is not set to quirks mode, and the stack of open elements * > has a p element in button scope, then close a p element. */ if ( WP_HTML_Tag_Processor::QUIRKS_MODE !== $this->compat_mode && $this->state->stack_of_open_elements->has_p_in_button_scope() ) { $this->close_a_p_element(); } $this->insert_html_element( $this->state->current_token ); $this->state->frameset_ok = false; $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE; return true; /* * > An end tag whose tag name is "br" * * This is prevented from happening because the Tag Processor * reports all closing BR tags as if they were opening tags. */ /* * > A start tag whose tag name is one of: "area", "br", "embed", "img", "keygen", "wbr" */ case '+AREA': case '+BR': case '+EMBED': case '+IMG': case '+KEYGEN': case '+WBR': $this->reconstruct_active_formatting_elements(); $this->insert_html_element( $this->state->current_token ); $this->state->frameset_ok = false; return true; /* * > A start tag whose tag name is "input" */ case '+INPUT': $this->reconstruct_active_formatting_elements(); $this->insert_html_element( $this->state->current_token ); /* * > If the token does not have an attribute with the name "type", or if it does, * > but that attribute's value is not an ASCII case-insensitive match for the * > string "hidden", then: set the frameset-ok flag to "not ok". */ $type_attribute = $this->get_attribute( 'type' ); if ( ! is_string( $type_attribute ) || 'hidden' !== strtolower( $type_attribute ) ) { $this->state->frameset_ok = false; } return true; /* * > A start tag whose tag name is one of: "param", "source", "track" */ case '+PARAM': case '+SOURCE': case '+TRACK': $this->insert_html_element( $this->state->current_token ); return true; /* * > A start tag whose tag name is "hr" */ case '+HR': if ( $this->state->stack_of_open_elements->has_p_in_button_scope() ) { $this->close_a_p_element(); } $this->insert_html_element( $this->state->current_token ); $this->state->frameset_ok = false; return true; /* * > A start tag whose tag name is "image" */ case '+IMAGE': /* * > Parse error. Change the token's tag name to "img" and reprocess it. (Don't ask.) * * Note that this is handled elsewhere, so it should not be possible to reach this code. */ $this->bail( "Cannot process an IMAGE tag. (Don't ask.)" ); break; /* * > A start tag whose tag name is "textarea" */ case '+TEXTAREA': $this->insert_html_element( $this->state->current_token ); /* * > If the next token is a U+000A LINE FEED (LF) character token, then ignore * > that token and move on to the next one. (Newlines at the start of * > textarea elements are ignored as an authoring convenience.) * * This is handled in `get_modifiable_text()`. */ $this->state->frameset_ok = false; /* * > Switch the insertion mode to "text". * * As a self-contained node, this behavior is handled in the Tag Processor. */ return true; /* * > A start tag whose tag name is "xmp" */ case '+XMP': if ( $this->state->stack_of_open_elements->has_p_in_button_scope() ) { $this->close_a_p_element(); } $this->reconstruct_active_formatting_elements(); $this->state->frameset_ok = false; /* * > Follow the generic raw text element parsing algorithm. * * As a self-contained node, this behavior is handled in the Tag Processor. */ $this->insert_html_element( $this->state->current_token ); return true; /* * A start tag whose tag name is "iframe" */ case '+IFRAME': $this->state->frameset_ok = false; /* * > Follow the generic raw text element parsing algorithm. * * As a self-contained node, this behavior is handled in the Tag Processor. */ $this->insert_html_element( $this->state->current_token ); return true; /* * > A start tag whose tag name is "noembed" * > A start tag whose tag name is "noscript", if the scripting flag is enabled * * The scripting flag is never enabled in this parser. */ case '+NOEMBED': $this->insert_html_element( $this->state->current_token ); return true; /* * > A start tag whose tag name is "select" */ case '+SELECT': $this->reconstruct_active_formatting_elements(); $this->insert_html_element( $this->state->current_token ); $this->state->frameset_ok = false; switch ( $this->state->insertion_mode ) { /* * > If the insertion mode is one of "in table", "in caption", "in table body", "in row", * > or "in cell", then switch the insertion mode to "in select in table". */ case WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE: case WP_HTML_Processor_State::INSERTION_MODE_IN_CAPTION: case WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE_BODY: case WP_HTML_Processor_State::INSERTION_MODE_IN_ROW: case WP_HTML_Processor_State::INSERTION_MODE_IN_CELL: $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_SELECT_IN_TABLE; break; /* * > Otherwise, switch the insertion mode to "in select". */ default: $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_SELECT; break; } return true; /* * > A start tag whose tag name is one of: "optgroup", "option" */ case '+OPTGROUP': case '+OPTION': if ( $this->state->stack_of_open_elements->current_node_is( 'OPTION' ) ) { $this->state->stack_of_open_elements->pop(); } $this->reconstruct_active_formatting_elements(); $this->insert_html_element( $this->state->current_token ); return true; /* * > A start tag whose tag name is one of: "rb", "rtc" */ case '+RB': case '+RTC': if ( $this->state->stack_of_open_elements->has_element_in_scope( 'RUBY' ) ) { $this->generate_implied_end_tags(); if ( $this->state->stack_of_open_elements->current_node_is( 'RUBY' ) ) { // @todo Indicate a parse error once it's possible. } } $this->insert_html_element( $this->state->current_token ); return true; /* * > A start tag whose tag name is one of: "rp", "rt" */ case '+RP': case '+RT': if ( $this->state->stack_of_open_elements->has_element_in_scope( 'RUBY' ) ) { $this->generate_implied_end_tags( 'RTC' ); $current_node_name = $this->state->stack_of_open_elements->current_node()->node_name; if ( 'RTC' === $current_node_name || 'RUBY' === $current_node_name ) { // @todo Indicate a parse error once it's possible. } } $this->insert_html_element( $this->state->current_token ); return true; /* * > A start tag whose tag name is "math" */ case '+MATH': $this->reconstruct_active_formatting_elements(); /* * @todo Adjust MathML attributes for the token. (This fixes the case of MathML attributes that are not all lowercase.) * @todo Adjust foreign attributes for the token. (This fixes the use of namespaced attributes, in particular XLink.) * * These ought to be handled in the attribute methods. */ $this->state->current_token->namespace = 'math'; $this->insert_html_element( $this->state->current_token ); if ( $this->state->current_token->has_self_closing_flag ) { $this->state->stack_of_open_elements->pop(); } return true; /* * > A start tag whose tag name is "svg" */ case '+SVG': $this->reconstruct_active_formatting_elements(); /* * @todo Adjust SVG attributes for the token. (This fixes the case of SVG attributes that are not all lowercase.) * @todo Adjust foreign attributes for the token. (This fixes the use of namespaced attributes, in particular XLink in SVG.) * * These ought to be handled in the attribute methods. */ $this->state->current_token->namespace = 'svg'; $this->insert_html_element( $this->state->current_token ); if ( $this->state->current_token->has_self_closing_flag ) { $this->state->stack_of_open_elements->pop(); } return true; /* * > A start tag whose tag name is one of: "caption", "col", "colgroup", * > "frame", "head", "tbody", "td", "tfoot", "th", "thead", "tr" */ case '+CAPTION': case '+COL': case '+COLGROUP': case '+FRAME': case '+HEAD': case '+TBODY': case '+TD': case '+TFOOT': case '+TH': case '+THEAD': case '+TR': // Parse error. Ignore the token. return $this->step(); } if ( ! parent::is_tag_closer() ) { /* * > Any other start tag */ $this->reconstruct_active_formatting_elements(); $this->insert_html_element( $this->state->current_token ); return true; } else { /* * > Any other end tag */ /* * Find the corresponding tag opener in the stack of open elements, if * it exists before reaching a special element, which provides a kind * of boundary in the stack. For example, a `</custom-tag>` should not * close anything beyond its containing `P` or `DIV` element. */ foreach ( $this->state->stack_of_open_elements->walk_up() as $node ) { if ( 'html' === $node->namespace && $token_name === $node->node_name ) { break; } if ( self::is_special( $node ) ) { // This is a parse error, ignore the token. return $this->step(); } } $this->generate_implied_end_tags( $token_name ); if ( $node !== $this->state->stack_of_open_elements->current_node() ) { // @todo Record parse error: this error doesn't impact parsing. } foreach ( $this->state->stack_of_open_elements->walk_up() as $item ) { $this->state->stack_of_open_elements->pop(); if ( $node === $item ) { return true; } } } $this->bail( 'Should not have been able to reach end of IN BODY processing. Check HTML API code.' ); // This unnecessary return prevents tools from inaccurately reporting type errors. return false; } /** * Parses next element in the 'in table' insertion mode. * * This internal function performs the 'in table' insertion mode * logic for the generalized WP_HTML_Processor::step() function. * * @since 6.7.0 * * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. * * @see https://html.spec.whatwg.org/#parsing-main-intable * @see WP_HTML_Processor::step * * @return bool Whether an element was found. */ private function step_in_table(): bool { $token_name = $this->get_token_name(); $token_type = $this->get_token_type(); $op_sigil = '#tag' === $token_type ? ( parent::is_tag_closer() ? '-' : '+' ) : ''; $op = "{$op_sigil}{$token_name}"; switch ( $op ) { /* * > A character token, if the current node is table, * > tbody, template, tfoot, thead, or tr element */ case '#text': $current_node = $this->state->stack_of_open_elements->current_node(); $current_node_name = $current_node ? $current_node->node_name : null; if ( $current_node_name && ( 'TABLE' === $current_node_name || 'TBODY' === $current_node_name || 'TEMPLATE' === $current_node_name || 'TFOOT' === $current_node_name || 'THEAD' === $current_node_name || 'TR' === $current_node_name ) ) { /* * If the text is empty after processing HTML entities and stripping * U+0000 NULL bytes then ignore the token. */ if ( parent::TEXT_IS_NULL_SEQUENCE === $this->text_node_classification ) { return $this->step(); } /* * This follows the rules for "in table text" insertion mode. * * Whitespace-only text nodes are inserted in-place. Otherwise * foster parenting is enabled and the nodes would be * inserted out-of-place. * * > If any of the tokens in the pending table character tokens * > list are character tokens that are not ASCII whitespace, * > then this is a parse error: reprocess the character tokens * > in the pending table character tokens list using the rules * > given in the "anything else" entry in the "in table" * > insertion mode. * > * > Otherwise, insert the characters given by the pending table * > character tokens list. * * @see https://html.spec.whatwg.org/#parsing-main-intabletext */ if ( parent::TEXT_IS_WHITESPACE === $this->text_node_classification ) { $this->insert_html_element( $this->state->current_token ); return true; } // Non-whitespace would trigger fostering, unsupported at this time. $this->bail( 'Foster parenting is not supported.' ); break; } break; /* * > A comment token */ case '#comment': case '#funky-comment': case '#presumptuous-tag': $this->insert_html_element( $this->state->current_token ); return true; /* * > A DOCTYPE token */ case 'html': // Parse error: ignore the token. return $this->step(); /* * > A start tag whose tag name is "caption" */ case '+CAPTION': $this->state->stack_of_open_elements->clear_to_table_context(); $this->state->active_formatting_elements->insert_marker(); $this->insert_html_element( $this->state->current_token ); $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_CAPTION; return true; /* * > A start tag whose tag name is "colgroup" */ case '+COLGROUP': $this->state->stack_of_open_elements->clear_to_table_context(); $this->insert_html_element( $this->state->current_token ); $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_COLUMN_GROUP; return true; /* * > A start tag whose tag name is "col" */ case '+COL': $this->state->stack_of_open_elements->clear_to_table_context(); /* * > Insert an HTML element for a "colgroup" start tag token with no attributes, * > then switch the insertion mode to "in column group". */ $this->insert_virtual_node( 'COLGROUP' ); $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_COLUMN_GROUP; return $this->step( self::REPROCESS_CURRENT_NODE ); /* * > A start tag whose tag name is one of: "tbody", "tfoot", "thead" */ case '+TBODY': case '+TFOOT': case '+THEAD': $this->state->stack_of_open_elements->clear_to_table_context(); $this->insert_html_element( $this->state->current_token ); $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE_BODY; return true; /* * > A start tag whose tag name is one of: "td", "th", "tr" */ case '+TD': case '+TH': case '+TR': $this->state->stack_of_open_elements->clear_to_table_context(); /* * > Insert an HTML element for a "tbody" start tag token with no attributes, * > then switch the insertion mode to "in table body". */ $this->insert_virtual_node( 'TBODY' ); $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE_BODY; return $this->step( self::REPROCESS_CURRENT_NODE ); /* * > A start tag whose tag name is "table" * * This tag in the IN TABLE insertion mode is a parse error. */ case '+TABLE': if ( ! $this->state->stack_of_open_elements->has_element_in_table_scope( 'TABLE' ) ) { return $this->step(); } $this->state->stack_of_open_elements->pop_until( 'TABLE' ); $this->reset_insertion_mode_appropriately(); return $this->step( self::REPROCESS_CURRENT_NODE ); /* * > An end tag whose tag name is "table" */ case '-TABLE': if ( ! $this->state->stack_of_open_elements->has_element_in_table_scope( 'TABLE' ) ) { // @todo Indicate a parse error once it's possible. return $this->step(); } $this->state->stack_of_open_elements->pop_until( 'TABLE' ); $this->reset_insertion_mode_appropriately(); return true; /* * > An end tag whose tag name is one of: "body", "caption", "col", "colgroup", "html", "tbody", "td", "tfoot", "th", "thead", "tr" */ case '-BODY': case '-CAPTION': case '-COL': case '-COLGROUP': case '-HTML': case '-TBODY': case '-TD': case '-TFOOT': case '-TH': case '-THEAD': case '-TR': // Parse error: ignore the token. return $this->step(); /* * > A start tag whose tag name is one of: "style", "script", "template" * > An end tag whose tag name is "template" */ case '+STYLE': case '+SCRIPT': case '+TEMPLATE': case '-TEMPLATE': /* * > Process the token using the rules for the "in head" insertion mode. */ return $this->step_in_head(); /* * > A start tag whose tag name is "input" * * > If the token does not have an attribute with the name "type", or if it does, but * > that attribute's value is not an ASCII case-insensitive match for the string * > "hidden", then: act as described in the "anything else" entry below. */ case '+INPUT': $type_attribute = $this->get_attribute( 'type' ); if ( ! is_string( $type_attribute ) || 'hidden' !== strtolower( $type_attribute ) ) { goto anything_else; } // @todo Indicate a parse error once it's possible. $this->insert_html_element( $this->state->current_token ); return true; /* * > A start tag whose tag name is "form" * * This tag in the IN TABLE insertion mode is a parse error. */ case '+FORM': if ( $this->state->stack_of_open_elements->has_element_in_scope( 'TEMPLATE' ) || isset( $this->state->form_element ) ) { return $this->step(); } // This FORM is special because it immediately closes and cannot have other children. $this->insert_html_element( $this->state->current_token ); $this->state->form_element = $this->state->current_token; $this->state->stack_of_open_elements->pop(); return true; } /* * > Anything else * > Parse error. Enable foster parenting, process the token using the rules for the * > "in body" insertion mode, and then disable foster parenting. * * @todo Indicate a parse error once it's possible. */ anything_else: $this->bail( 'Foster parenting is not supported.' ); } /** * Parses next element in the 'in table text' insertion mode. * * This internal function performs the 'in table text' insertion mode * logic for the generalized WP_HTML_Processor::step() function. * * @since 6.7.0 Stub implementation. * * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. * * @see https://html.spec.whatwg.org/#parsing-main-intabletext * @see WP_HTML_Processor::step * * @return bool Whether an element was found. */ private function step_in_table_text(): bool { $this->bail( 'No support for parsing in the ' . WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE_TEXT . ' state.' ); } /** * Parses next element in the 'in caption' insertion mode. * * This internal function performs the 'in caption' insertion mode * logic for the generalized WP_HTML_Processor::step() function. * * @since 6.7.0 * * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. * * @see https://html.spec.whatwg.org/#parsing-main-incaption * @see WP_HTML_Processor::step * * @return bool Whether an element was found. */ private function step_in_caption(): bool { $tag_name = $this->get_tag(); $op_sigil = $this->is_tag_closer() ? '-' : '+'; $op = "{$op_sigil}{$tag_name}"; switch ( $op ) { /* * > An end tag whose tag name is "caption" * > A start tag whose tag name is one of: "caption", "col", "colgroup", "tbody", "td", "tfoot", "th", "thead", "tr" * > An end tag whose tag name is "table" * * These tag handling rules are identical except for the final instruction. * Handle them in a single block. */ case '-CAPTION': case '+CAPTION': case '+COL': case '+COLGROUP': case '+TBODY': case '+TD': case '+TFOOT': case '+TH': case '+THEAD': case '+TR': case '-TABLE': if ( ! $this->state->stack_of_open_elements->has_element_in_table_scope( 'CAPTION' ) ) { // Parse error: ignore the token. return $this->step(); } $this->generate_implied_end_tags(); if ( ! $this->state->stack_of_open_elements->current_node_is( 'CAPTION' ) ) { // @todo Indicate a parse error once it's possible. } $this->state->stack_of_open_elements->pop_until( 'CAPTION' ); $this->state->active_formatting_elements->clear_up_to_last_marker(); $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE; // If this is not a CAPTION end tag, the token should be reprocessed. if ( '-CAPTION' === $op ) { return true; } return $this->step( self::REPROCESS_CURRENT_NODE ); /** * > An end tag whose tag name is one of: "body", "col", "colgroup", "html", "tbody", "td", "tfoot", "th", "thead", "tr" */ case '-BODY': case '-COL': case '-COLGROUP': case '-HTML': case '-TBODY': case '-TD': case '-TFOOT': case '-TH': case '-THEAD': case '-TR': // Parse error: ignore the token. return $this->step(); } /** * > Anything else * > Process the token using the rules for the "in body" insertion mode. */ return $this->step_in_body(); } /** * Parses next element in the 'in column group' insertion mode. * * This internal function performs the 'in column group' insertion mode * logic for the generalized WP_HTML_Processor::step() function. * * @since 6.7.0 * * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. * * @see https://html.spec.whatwg.org/#parsing-main-incolgroup * @see WP_HTML_Processor::step * * @return bool Whether an element was found. */ private function step_in_column_group(): bool { $token_name = $this->get_token_name(); $token_type = $this->get_token_type(); $op_sigil = '#tag' === $token_type ? ( parent::is_tag_closer() ? '-' : '+' ) : ''; $op = "{$op_sigil}{$token_name}"; switch ( $op ) { /* * > A character token that is one of U+0009 CHARACTER TABULATION, U+000A LINE FEED (LF), * > U+000C FORM FEED (FF), U+000D CARRIAGE RETURN (CR), or U+0020 SPACE */ case '#text': if ( parent::TEXT_IS_WHITESPACE === $this->text_node_classification ) { // Insert the character. $this->insert_html_element( $this->state->current_token ); return true; } goto in_column_group_anything_else; break; /* * > A comment token */ case '#comment': case '#funky-comment': case '#presumptuous-tag': $this->insert_html_element( $this->state->current_token ); return true; /* * > A DOCTYPE token */ case 'html': // @todo Indicate a parse error once it's possible. return $this->step(); /* * > A start tag whose tag name is "html" */ case '+HTML': return $this->step_in_body(); /* * > A start tag whose tag name is "col" */ case '+COL': $this->insert_html_element( $this->state->current_token ); $this->state->stack_of_open_elements->pop(); return true; /* * > An end tag whose tag name is "colgroup" */ case '-COLGROUP': if ( ! $this->state->stack_of_open_elements->current_node_is( 'COLGROUP' ) ) { // @todo Indicate a parse error once it's possible. return $this->step(); } $this->state->stack_of_open_elements->pop(); $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE; return true; /* * > An end tag whose tag name is "col" */ case '-COL': // Parse error: ignore the token. return $this->step(); /* * > A start tag whose tag name is "template" * > An end tag whose tag name is "template" */ case '+TEMPLATE': case '-TEMPLATE': return $this->step_in_head(); } in_column_group_anything_else: /* * > Anything else */ if ( ! $this->state->stack_of_open_elements->current_node_is( 'COLGROUP' ) ) { // @todo Indicate a parse error once it's possible. return $this->step(); } $this->state->stack_of_open_elements->pop(); $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE; return $this->step( self::REPROCESS_CURRENT_NODE ); } /** * Parses next element in the 'in table body' insertion mode. * * This internal function performs the 'in table body' insertion mode * logic for the generalized WP_HTML_Processor::step() function. * * @since 6.7.0 * * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. * * @see https://html.spec.whatwg.org/#parsing-main-intbody * @see WP_HTML_Processor::step * * @return bool Whether an element was found. */ private function step_in_table_body(): bool { $tag_name = $this->get_tag(); $op_sigil = $this->is_tag_closer() ? '-' : '+'; $op = "{$op_sigil}{$tag_name}"; switch ( $op ) { /* * > A start tag whose tag name is "tr" */ case '+TR': $this->state->stack_of_open_elements->clear_to_table_body_context(); $this->insert_html_element( $this->state->current_token ); $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_ROW; return true; /* * > A start tag whose tag name is one of: "th", "td" */ case '+TH': case '+TD': // @todo Indicate a parse error once it's possible. $this->state->stack_of_open_elements->clear_to_table_body_context(); $this->insert_virtual_node( 'TR' ); $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_ROW; return $this->step( self::REPROCESS_CURRENT_NODE ); /* * > An end tag whose tag name is one of: "tbody", "tfoot", "thead" */ case '-TBODY': case '-TFOOT': case '-THEAD': if ( ! $this->state->stack_of_open_elements->has_element_in_table_scope( $tag_name ) ) { // Parse error: ignore the token. return $this->step(); } $this->state->stack_of_open_elements->clear_to_table_body_context(); $this->state->stack_of_open_elements->pop(); $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE; return true; /* * > A start tag whose tag name is one of: "caption", "col", "colgroup", "tbody", "tfoot", "thead" * > An end tag whose tag name is "table" */ case '+CAPTION': case '+COL': case '+COLGROUP': case '+TBODY': case '+TFOOT': case '+THEAD': case '-TABLE': if ( ! $this->state->stack_of_open_elements->has_element_in_table_scope( 'TBODY' ) && ! $this->state->stack_of_open_elements->has_element_in_table_scope( 'THEAD' ) && ! $this->state->stack_of_open_elements->has_element_in_table_scope( 'TFOOT' ) ) { // Parse error: ignore the token. return $this->step(); } $this->state->stack_of_open_elements->clear_to_table_body_context(); $this->state->stack_of_open_elements->pop(); $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE; return $this->step( self::REPROCESS_CURRENT_NODE ); /* * > An end tag whose tag name is one of: "body", "caption", "col", "colgroup", "html", "td", "th", "tr" */ case '-BODY': case '-CAPTION': case '-COL': case '-COLGROUP': case '-HTML': case '-TD': case '-TH': case '-TR': // Parse error: ignore the token. return $this->step(); } /* * > Anything else * > Process the token using the rules for the "in table" insertion mode. */ return $this->step_in_table(); } /** * Parses next element in the 'in row' insertion mode. * * This internal function performs the 'in row' insertion mode * logic for the generalized WP_HTML_Processor::step() function. * * @since 6.7.0 * * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. * * @see https://html.spec.whatwg.org/#parsing-main-intr * @see WP_HTML_Processor::step * * @return bool Whether an element was found. */ private function step_in_row(): bool { $tag_name = $this->get_tag(); $op_sigil = $this->is_tag_closer() ? '-' : '+'; $op = "{$op_sigil}{$tag_name}"; switch ( $op ) { /* * > A start tag whose tag name is one of: "th", "td" */ case '+TH': case '+TD': $this->state->stack_of_open_elements->clear_to_table_row_context(); $this->insert_html_element( $this->state->current_token ); $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_CELL; $this->state->active_formatting_elements->insert_marker(); return true; /* * > An end tag whose tag name is "tr" */ case '-TR': if ( ! $this->state->stack_of_open_elements->has_element_in_table_scope( 'TR' ) ) { // Parse error: ignore the token. return $this->step(); } $this->state->stack_of_open_elements->clear_to_table_row_context(); $this->state->stack_of_open_elements->pop(); $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE_BODY; return true; /* * > A start tag whose tag name is one of: "caption", "col", "colgroup", "tbody", "tfoot", "thead", "tr" * > An end tag whose tag name is "table" */ case '+CAPTION': case '+COL': case '+COLGROUP': case '+TBODY': case '+TFOOT': case '+THEAD': case '+TR': case '-TABLE': if ( ! $this->state->stack_of_open_elements->has_element_in_table_scope( 'TR' ) ) { // Parse error: ignore the token. return $this->step(); } $this->state->stack_of_open_elements->clear_to_table_row_context(); $this->state->stack_of_open_elements->pop(); $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE_BODY; return $this->step( self::REPROCESS_CURRENT_NODE ); /* * > An end tag whose tag name is one of: "tbody", "tfoot", "thead" */ case '-TBODY': case '-TFOOT': case '-THEAD': if ( ! $this->state->stack_of_open_elements->has_element_in_table_scope( $tag_name ) ) { // Parse error: ignore the token. return $this->step(); } if ( ! $this->state->stack_of_open_elements->has_element_in_table_scope( 'TR' ) ) { // Ignore the token. return $this->step(); } $this->state->stack_of_open_elements->clear_to_table_row_context(); $this->state->stack_of_open_elements->pop(); $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE_BODY; return $this->step( self::REPROCESS_CURRENT_NODE ); /* * > An end tag whose tag name is one of: "body", "caption", "col", "colgroup", "html", "td", "th" */ case '-BODY': case '-CAPTION': case '-COL': case '-COLGROUP': case '-HTML': case '-TD': case '-TH': // Parse error: ignore the token. return $this->step(); } /* * > Anything else * > Process the token using the rules for the "in table" insertion mode. */ return $this->step_in_table(); } /** * Parses next element in the 'in cell' insertion mode. * * This internal function performs the 'in cell' insertion mode * logic for the generalized WP_HTML_Processor::step() function. * * @since 6.7.0 * * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. * * @see https://html.spec.whatwg.org/#parsing-main-intd * @see WP_HTML_Processor::step * * @return bool Whether an element was found. */ private function step_in_cell(): bool { $tag_name = $this->get_tag(); $op_sigil = $this->is_tag_closer() ? '-' : '+'; $op = "{$op_sigil}{$tag_name}"; switch ( $op ) { /* * > An end tag whose tag name is one of: "td", "th" */ case '-TD': case '-TH': if ( ! $this->state->stack_of_open_elements->has_element_in_table_scope( $tag_name ) ) { // Parse error: ignore the token. return $this->step(); } $this->generate_implied_end_tags(); /* * @todo This needs to check if the current node is an HTML element, meaning that * when SVG and MathML support is added, this needs to differentiate between an * HTML element of the given name, such as `<center>`, and a foreign element of * the same given name. */ if ( ! $this->state->stack_of_open_elements->current_node_is( $tag_name ) ) { // @todo Indicate a parse error once it's possible. } $this->state->stack_of_open_elements->pop_until( $tag_name ); $this->state->active_formatting_elements->clear_up_to_last_marker(); $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_ROW; return true; /* * > A start tag whose tag name is one of: "caption", "col", "colgroup", "tbody", "td", * > "tfoot", "th", "thead", "tr" */ case '+CAPTION': case '+COL': case '+COLGROUP': case '+TBODY': case '+TD': case '+TFOOT': case '+TH': case '+THEAD': case '+TR': /* * > Assert: The stack of open elements has a td or th element in table scope. * * Nothing to do here, except to verify in tests that this never appears. */ $this->close_cell(); return $this->step( self::REPROCESS_CURRENT_NODE ); /* * > An end tag whose tag name is one of: "body", "caption", "col", "colgroup", "html" */ case '-BODY': case '-CAPTION': case '-COL': case '-COLGROUP': case '-HTML': // Parse error: ignore the token. return $this->step(); /* * > An end tag whose tag name is one of: "table", "tbody", "tfoot", "thead", "tr" */ case '-TABLE': case '-TBODY': case '-TFOOT': case '-THEAD': case '-TR': if ( ! $this->state->stack_of_open_elements->has_element_in_table_scope( $tag_name ) ) { // Parse error: ignore the token. return $this->step(); } $this->close_cell(); return $this->step( self::REPROCESS_CURRENT_NODE ); } /* * > Anything else * > Process the token using the rules for the "in body" insertion mode. */ return $this->step_in_body(); } /** * Parses next element in the 'in select' insertion mode. * * This internal function performs the 'in select' insertion mode * logic for the generalized WP_HTML_Processor::step() function. * * @since 6.7.0 * * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. * * @see https://html.spec.whatwg.org/multipage/parsing.html#parsing-main-inselect * @see WP_HTML_Processor::step * * @return bool Whether an element was found. */ private function step_in_select(): bool { $token_name = $this->get_token_name(); $token_type = $this->get_token_type(); $op_sigil = '#tag' === $token_type ? ( parent::is_tag_closer() ? '-' : '+' ) : ''; $op = "{$op_sigil}{$token_name}"; switch ( $op ) { /* * > Any other character token */ case '#text': /* * > A character token that is U+0000 NULL * * If a text node only comprises null bytes then it should be * entirely ignored and should not return to calling code. */ if ( parent::TEXT_IS_NULL_SEQUENCE === $this->text_node_classification ) { // Parse error: ignore the token. return $this->step(); } $this->insert_html_element( $this->state->current_token ); return true; /* * > A comment token */ case '#comment': case '#funky-comment': case '#presumptuous-tag': $this->insert_html_element( $this->state->current_token ); return true; /* * > A DOCTYPE token */ case 'html': // Parse error: ignore the token. return $this->step(); /* * > A start tag whose tag name is "html" */ case '+HTML': return $this->step_in_body(); /* * > A start tag whose tag name is "option" */ case '+OPTION': if ( $this->state->stack_of_open_elements->current_node_is( 'OPTION' ) ) { $this->state->stack_of_open_elements->pop(); } $this->insert_html_element( $this->state->current_token ); return true; /* * > A start tag whose tag name is "optgroup" * > A start tag whose tag name is "hr" * * These rules are identical except for the treatment of the self-closing flag and * the subsequent pop of the HR void element, all of which is handled elsewhere in the processor. */ case '+OPTGROUP': case '+HR': if ( $this->state->stack_of_open_elements->current_node_is( 'OPTION' ) ) { $this->state->stack_of_open_elements->pop(); } if ( $this->state->stack_of_open_elements->current_node_is( 'OPTGROUP' ) ) { $this->state->stack_of_open_elements->pop(); } $this->insert_html_element( $this->state->current_token ); return true; /* * > An end tag whose tag name is "optgroup" */ case '-OPTGROUP': $current_node = $this->state->stack_of_open_elements->current_node(); if ( $current_node && 'OPTION' === $current_node->node_name ) { foreach ( $this->state->stack_of_open_elements->walk_up( $current_node ) as $parent ) { break; } if ( $parent && 'OPTGROUP' === $parent->node_name ) { $this->state->stack_of_open_elements->pop(); } } if ( $this->state->stack_of_open_elements->current_node_is( 'OPTGROUP' ) ) { $this->state->stack_of_open_elements->pop(); return true; } // Parse error: ignore the token. return $this->step(); /* * > An end tag whose tag name is "option" */ case '-OPTION': if ( $this->state->stack_of_open_elements->current_node_is( 'OPTION' ) ) { $this->state->stack_of_open_elements->pop(); return true; } // Parse error: ignore the token. return $this->step(); /* * > An end tag whose tag name is "select" * > A start tag whose tag name is "select" * * > It just gets treated like an end tag. */ case '-SELECT': case '+SELECT': if ( ! $this->state->stack_of_open_elements->has_element_in_select_scope( 'SELECT' ) ) { // Parse error: ignore the token. return $this->step(); } $this->state->stack_of_open_elements->pop_until( 'SELECT' ); $this->reset_insertion_mode_appropriately(); return true; /* * > A start tag whose tag name is one of: "input", "keygen", "textarea" * * All three of these tags are considered a parse error when found in this insertion mode. */ case '+INPUT': case '+KEYGEN': case '+TEXTAREA': if ( ! $this->state->stack_of_open_elements->has_element_in_select_scope( 'SELECT' ) ) { // Ignore the token. return $this->step(); } $this->state->stack_of_open_elements->pop_until( 'SELECT' ); $this->reset_insertion_mode_appropriately(); return $this->step( self::REPROCESS_CURRENT_NODE ); /* * > A start tag whose tag name is one of: "script", "template" * > An end tag whose tag name is "template" */ case '+SCRIPT': case '+TEMPLATE': case '-TEMPLATE': return $this->step_in_head(); } /* * > Anything else * > Parse error: ignore the token. */ return $this->step(); } /** * Parses next element in the 'in select in table' insertion mode. * * This internal function performs the 'in select in table' insertion mode * logic for the generalized WP_HTML_Processor::step() function. * * @since 6.7.0 * * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. * * @see https://html.spec.whatwg.org/#parsing-main-inselectintable * @see WP_HTML_Processor::step * * @return bool Whether an element was found. */ private function step_in_select_in_table(): bool { $token_name = $this->get_token_name(); $token_type = $this->get_token_type(); $op_sigil = '#tag' === $token_type ? ( parent::is_tag_closer() ? '-' : '+' ) : ''; $op = "{$op_sigil}{$token_name}"; switch ( $op ) { /* * > A start tag whose tag name is one of: "caption", "table", "tbody", "tfoot", "thead", "tr", "td", "th" */ case '+CAPTION': case '+TABLE': case '+TBODY': case '+TFOOT': case '+THEAD': case '+TR': case '+TD': case '+TH': // @todo Indicate a parse error once it's possible. $this->state->stack_of_open_elements->pop_until( 'SELECT' ); $this->reset_insertion_mode_appropriately(); return $this->step( self::REPROCESS_CURRENT_NODE ); /* * > An end tag whose tag name is one of: "caption", "table", "tbody", "tfoot", "thead", "tr", "td", "th" */ case '-CAPTION': case '-TABLE': case '-TBODY': case '-TFOOT': case '-THEAD': case '-TR': case '-TD': case '-TH': // @todo Indicate a parse error once it's possible. if ( ! $this->state->stack_of_open_elements->has_element_in_table_scope( $token_name ) ) { return $this->step(); } $this->state->stack_of_open_elements->pop_until( 'SELECT' ); $this->reset_insertion_mode_appropriately(); return $this->step( self::REPROCESS_CURRENT_NODE ); } /* * > Anything else */ return $this->step_in_select(); } /** * Parses next element in the 'in template' insertion mode. * * This internal function performs the 'in template' insertion mode * logic for the generalized WP_HTML_Processor::step() function. * * @since 6.7.0 Stub implementation. * * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. * * @see https://html.spec.whatwg.org/#parsing-main-intemplate * @see WP_HTML_Processor::step * * @return bool Whether an element was found. */ private function step_in_template(): bool { $token_name = $this->get_token_name(); $token_type = $this->get_token_type(); $is_closer = $this->is_tag_closer(); $op_sigil = '#tag' === $token_type ? ( $is_closer ? '-' : '+' ) : ''; $op = "{$op_sigil}{$token_name}"; switch ( $op ) { /* * > A character token * > A comment token * > A DOCTYPE token */ case '#text': case '#comment': case '#funky-comment': case '#presumptuous-tag': case 'html': return $this->step_in_body(); /* * > A start tag whose tag name is one of: "base", "basefont", "bgsound", "link", * > "meta", "noframes", "script", "style", "template", "title" * > An end tag whose tag name is "template" */ case '+BASE': case '+BASEFONT': case '+BGSOUND': case '+LINK': case '+META': case '+NOFRAMES': case '+SCRIPT': case '+STYLE': case '+TEMPLATE': case '+TITLE': case '-TEMPLATE': return $this->step_in_head(); /* * > A start tag whose tag name is one of: "caption", "colgroup", "tbody", "tfoot", "thead" */ case '+CAPTION': case '+COLGROUP': case '+TBODY': case '+TFOOT': case '+THEAD': array_pop( $this->state->stack_of_template_insertion_modes ); $this->state->stack_of_template_insertion_modes[] = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE; $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE; return $this->step( self::REPROCESS_CURRENT_NODE ); /* * > A start tag whose tag name is "col" */ case '+COL': array_pop( $this->state->stack_of_template_insertion_modes ); $this->state->stack_of_template_insertion_modes[] = WP_HTML_Processor_State::INSERTION_MODE_IN_COLUMN_GROUP; $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_COLUMN_GROUP; return $this->step( self::REPROCESS_CURRENT_NODE ); /* * > A start tag whose tag name is "tr" */ case '+TR': array_pop( $this->state->stack_of_template_insertion_modes ); $this->state->stack_of_template_insertion_modes[] = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE_BODY; $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE_BODY; return $this->step( self::REPROCESS_CURRENT_NODE ); /* * > A start tag whose tag name is one of: "td", "th" */ case '+TD': case '+TH': array_pop( $this->state->stack_of_template_insertion_modes ); $this->state->stack_of_template_insertion_modes[] = WP_HTML_Processor_State::INSERTION_MODE_IN_ROW; $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_ROW; return $this->step( self::REPROCESS_CURRENT_NODE ); } /* * > Any other start tag */ if ( ! $is_closer ) { array_pop( $this->state->stack_of_template_insertion_modes ); $this->state->stack_of_template_insertion_modes[] = WP_HTML_Processor_State::INSERTION_MODE_IN_BODY; $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_BODY; return $this->step( self::REPROCESS_CURRENT_NODE ); } /* * > Any other end tag */ if ( $is_closer ) { // Parse error: ignore the token. return $this->step(); } /* * > An end-of-file token */ if ( ! $this->state->stack_of_open_elements->contains( 'TEMPLATE' ) ) { // Stop parsing. return false; } // @todo Indicate a parse error once it's possible. $this->state->stack_of_open_elements->pop_until( 'TEMPLATE' ); $this->state->active_formatting_elements->clear_up_to_last_marker(); array_pop( $this->state->stack_of_template_insertion_modes ); $this->reset_insertion_mode_appropriately(); return $this->step( self::REPROCESS_CURRENT_NODE ); } /** * Parses next element in the 'after body' insertion mode. * * This internal function performs the 'after body' insertion mode * logic for the generalized WP_HTML_Processor::step() function. * * @since 6.7.0 Stub implementation. * * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. * * @see https://html.spec.whatwg.org/#parsing-main-afterbody * @see WP_HTML_Processor::step * * @return bool Whether an element was found. */ private function step_after_body(): bool { $tag_name = $this->get_token_name(); $token_type = $this->get_token_type(); $op_sigil = '#tag' === $token_type ? ( $this->is_tag_closer() ? '-' : '+' ) : ''; $op = "{$op_sigil}{$tag_name}"; switch ( $op ) { /* * > A character token that is one of U+0009 CHARACTER TABULATION, U+000A LINE FEED (LF), * > U+000C FORM FEED (FF), U+000D CARRIAGE RETURN (CR), or U+0020 SPACE * * > Process the token using the rules for the "in body" insertion mode. */ case '#text': if ( parent::TEXT_IS_WHITESPACE === $this->text_node_classification ) { return $this->step_in_body(); } goto after_body_anything_else; break; /* * > A comment token */ case '#comment': case '#funky-comment': case '#presumptuous-tag': $this->bail( 'Content outside of BODY is unsupported.' ); break; /* * > A DOCTYPE token */ case 'html': // Parse error: ignore the token. return $this->step(); /* * > A start tag whose tag name is "html" */ case '+HTML': return $this->step_in_body(); /* * > An end tag whose tag name is "html" * * > If the parser was created as part of the HTML fragment parsing algorithm, * > this is a parse error; ignore the token. (fragment case) * > * > Otherwise, switch the insertion mode to "after after body". */ case '-HTML': if ( isset( $this->context_node ) ) { return $this->step(); } $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_AFTER_AFTER_BODY; /* * The HTML element is not removed from the stack of open elements. * Only internal state has changed, this does not qualify as a "step" * in terms of advancing through the document to another token. * Nothing has been pushed or popped. * Proceed to parse the next item. */ return $this->step(); } /* * > Parse error. Switch the insertion mode to "in body" and reprocess the token. */ after_body_anything_else: $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_BODY; return $this->step( self::REPROCESS_CURRENT_NODE ); } /** * Parses next element in the 'in frameset' insertion mode. * * This internal function performs the 'in frameset' insertion mode * logic for the generalized WP_HTML_Processor::step() function. * * @since 6.7.0 Stub implementation. * * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. * * @see https://html.spec.whatwg.org/#parsing-main-inframeset * @see WP_HTML_Processor::step * * @return bool Whether an element was found. */ private function step_in_frameset(): bool { $tag_name = $this->get_token_name(); $token_type = $this->get_token_type(); $op_sigil = '#tag' === $token_type ? ( $this->is_tag_closer() ? '-' : '+' ) : ''; $op = "{$op_sigil}{$tag_name}"; switch ( $op ) { /* * > A character token that is one of U+0009 CHARACTER TABULATION, U+000A LINE FEED (LF), * > U+000C FORM FEED (FF), U+000D CARRIAGE RETURN (CR), or U+0020 SPACE * > * > Insert the character. * * This algorithm effectively strips non-whitespace characters from text and inserts * them under HTML. This is not supported at this time. */ case '#text': if ( parent::TEXT_IS_WHITESPACE === $this->text_node_classification ) { return $this->step_in_body(); } $this->bail( 'Non-whitespace characters cannot be handled in frameset.' ); break; /* * > A comment token */ case '#comment': case '#funky-comment': case '#presumptuous-tag': $this->insert_html_element( $this->state->current_token ); return true; /* * > A DOCTYPE token */ case 'html': // Parse error: ignore the token. return $this->step(); /* * > A start tag whose tag name is "html" */ case '+HTML': return $this->step_in_body(); /* * > A start tag whose tag name is "frameset" */ case '+FRAMESET': $this->insert_html_element( $this->state->current_token ); return true; /* * > An end tag whose tag name is "frameset" */ case '-FRAMESET': /* * > If the current node is the root html element, then this is a parse error; * > ignore the token. (fragment case) */ if ( $this->state->stack_of_open_elements->current_node_is( 'HTML' ) ) { return $this->step(); } /* * > Otherwise, pop the current node from the stack of open elements. */ $this->state->stack_of_open_elements->pop(); /* * > If the parser was not created as part of the HTML fragment parsing algorithm * > (fragment case), and the current node is no longer a frameset element, then * > switch the insertion mode to "after frameset". */ if ( ! isset( $this->context_node ) && ! $this->state->stack_of_open_elements->current_node_is( 'FRAMESET' ) ) { $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_AFTER_FRAMESET; } return true; /* * > A start tag whose tag name is "frame" * * > Insert an HTML element for the token. Immediately pop the * > current node off the stack of open elements. * > * > Acknowledge the token's self-closing flag, if it is set. */ case '+FRAME': $this->insert_html_element( $this->state->current_token ); $this->state->stack_of_open_elements->pop(); return true; /* * > A start tag whose tag name is "noframes" */ case '+NOFRAMES': return $this->step_in_head(); } // Parse error: ignore the token. return $this->step(); } /** * Parses next element in the 'after frameset' insertion mode. * * This internal function performs the 'after frameset' insertion mode * logic for the generalized WP_HTML_Processor::step() function. * * @since 6.7.0 Stub implementation. * * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. * * @see https://html.spec.whatwg.org/#parsing-main-afterframeset * @see WP_HTML_Processor::step * * @return bool Whether an element was found. */ private function step_after_frameset(): bool { $tag_name = $this->get_token_name(); $token_type = $this->get_token_type(); $op_sigil = '#tag' === $token_type ? ( $this->is_tag_closer() ? '-' : '+' ) : ''; $op = "{$op_sigil}{$tag_name}"; switch ( $op ) { /* * > A character token that is one of U+0009 CHARACTER TABULATION, U+000A LINE FEED (LF), * > U+000C FORM FEED (FF), U+000D CARRIAGE RETURN (CR), or U+0020 SPACE * > * > Insert the character. * * This algorithm effectively strips non-whitespace characters from text and inserts * them under HTML. This is not supported at this time. */ case '#text': if ( parent::TEXT_IS_WHITESPACE === $this->text_node_classification ) { return $this->step_in_body(); } $this->bail( 'Non-whitespace characters cannot be handled in after frameset' ); break; /* * > A comment token */ case '#comment': case '#funky-comment': case '#presumptuous-tag': $this->insert_html_element( $this->state->current_token ); return true; /* * > A DOCTYPE token */ case 'html': // Parse error: ignore the token. return $this->step(); /* * > A start tag whose tag name is "html" */ case '+HTML': return $this->step_in_body(); /* * > An end tag whose tag name is "html" */ case '-HTML': $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_AFTER_AFTER_FRAMESET; /* * The HTML element is not removed from the stack of open elements. * Only internal state has changed, this does not qualify as a "step" * in terms of advancing through the document to another token. * Nothing has been pushed or popped. * Proceed to parse the next item. */ return $this->step(); /* * > A start tag whose tag name is "noframes" */ case '+NOFRAMES': return $this->step_in_head(); } // Parse error: ignore the token. return $this->step(); } /** * Parses next element in the 'after after body' insertion mode. * * This internal function performs the 'after after body' insertion mode * logic for the generalized WP_HTML_Processor::step() function. * * @since 6.7.0 Stub implementation. * * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. * * @see https://html.spec.whatwg.org/#the-after-after-body-insertion-mode * @see WP_HTML_Processor::step * * @return bool Whether an element was found. */ private function step_after_after_body(): bool { $tag_name = $this->get_token_name(); $token_type = $this->get_token_type(); $op_sigil = '#tag' === $token_type ? ( $this->is_tag_closer() ? '-' : '+' ) : ''; $op = "{$op_sigil}{$tag_name}"; switch ( $op ) { /* * > A comment token */ case '#comment': case '#funky-comment': case '#presumptuous-tag': $this->bail( 'Content outside of HTML is unsupported.' ); break; /* * > A DOCTYPE token * > A start tag whose tag name is "html" * * > Process the token using the rules for the "in body" insertion mode. */ case 'html': case '+HTML': return $this->step_in_body(); /* * > A character token that is one of U+0009 CHARACTER TABULATION, U+000A LINE FEED (LF), * > U+000C FORM FEED (FF), U+000D CARRIAGE RETURN (CR), or U+0020 SPACE * > * > Process the token using the rules for the "in body" insertion mode. */ case '#text': if ( parent::TEXT_IS_WHITESPACE === $this->text_node_classification ) { return $this->step_in_body(); } goto after_after_body_anything_else; break; } /* * > Parse error. Switch the insertion mode to "in body" and reprocess the token. */ after_after_body_anything_else: $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_BODY; return $this->step( self::REPROCESS_CURRENT_NODE ); } /** * Parses next element in the 'after after frameset' insertion mode. * * This internal function performs the 'after after frameset' insertion mode * logic for the generalized WP_HTML_Processor::step() function. * * @since 6.7.0 Stub implementation. * * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. * * @see https://html.spec.whatwg.org/#the-after-after-frameset-insertion-mode * @see WP_HTML_Processor::step * * @return bool Whether an element was found. */ private function step_after_after_frameset(): bool { $tag_name = $this->get_token_name(); $token_type = $this->get_token_type(); $op_sigil = '#tag' === $token_type ? ( $this->is_tag_closer() ? '-' : '+' ) : ''; $op = "{$op_sigil}{$tag_name}"; switch ( $op ) { /* * > A comment token */ case '#comment': case '#funky-comment': case '#presumptuous-tag': $this->bail( 'Content outside of HTML is unsupported.' ); break; /* * > A DOCTYPE token * > A start tag whose tag name is "html" * * > Process the token using the rules for the "in body" insertion mode. */ case 'html': case '+HTML': return $this->step_in_body(); /* * > A character token that is one of U+0009 CHARACTER TABULATION, U+000A LINE FEED (LF), * > U+000C FORM FEED (FF), U+000D CARRIAGE RETURN (CR), or U+0020 SPACE * > * > Process the token using the rules for the "in body" insertion mode. * * This algorithm effectively strips non-whitespace characters from text and inserts * them under HTML. This is not supported at this time. */ case '#text': if ( parent::TEXT_IS_WHITESPACE === $this->text_node_classification ) { return $this->step_in_body(); } $this->bail( 'Non-whitespace characters cannot be handled in after after frameset.' ); break; /* * > A start tag whose tag name is "noframes" */ case '+NOFRAMES': return $this->step_in_head(); } // Parse error: ignore the token. return $this->step(); } /** * Parses next element in the 'in foreign content' insertion mode. * * This internal function performs the 'in foreign content' insertion mode * logic for the generalized WP_HTML_Processor::step() function. * * @since 6.7.0 Stub implementation. * * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. * * @see https://html.spec.whatwg.org/#parsing-main-inforeign * @see WP_HTML_Processor::step * * @return bool Whether an element was found. */ private function step_in_foreign_content(): bool { $tag_name = $this->get_token_name(); $token_type = $this->get_token_type(); $op_sigil = '#tag' === $token_type ? ( $this->is_tag_closer() ? '-' : '+' ) : ''; $op = "{$op_sigil}{$tag_name}"; /* * > A start tag whose name is "font", if the token has any attributes named "color", "face", or "size" * * This section drawn out above the switch to more easily incorporate * the additional rules based on the presence of the attributes. */ if ( '+FONT' === $op && ( null !== $this->get_attribute( 'color' ) || null !== $this->get_attribute( 'face' ) || null !== $this->get_attribute( 'size' ) ) ) { $op = '+FONT with attributes'; } switch ( $op ) { case '#text': /* * > A character token that is U+0000 NULL * * This is handled by `get_modifiable_text()`. */ /* * Whitespace-only text does not affect the frameset-ok flag. * It is probably inter-element whitespace, but it may also * contain character references which decode only to whitespace. */ if ( parent::TEXT_IS_GENERIC === $this->text_node_classification ) { $this->state->frameset_ok = false; } $this->insert_foreign_element( $this->state->current_token, false ); return true; /* * CDATA sections are alternate wrappers for text content and therefore * ought to follow the same rules as text nodes. */ case '#cdata-section': /* * NULL bytes and whitespace do not change the frameset-ok flag. */ $current_token = $this->bookmarks[ $this->state->current_token->bookmark_name ]; $cdata_content_start = $current_token->start + 9; $cdata_content_length = $current_token->length - 12; if ( strspn( $this->html, "\0 \t\n\f\r", $cdata_content_start, $cdata_content_length ) !== $cdata_content_length ) { $this->state->frameset_ok = false; } $this->insert_foreign_element( $this->state->current_token, false ); return true; /* * > A comment token */ case '#comment': case '#funky-comment': case '#presumptuous-tag': $this->insert_foreign_element( $this->state->current_token, false ); return true; /* * > A DOCTYPE token */ case 'html': // Parse error: ignore the token. return $this->step(); /* * > A start tag whose tag name is "b", "big", "blockquote", "body", "br", "center", * > "code", "dd", "div", "dl", "dt", "em", "embed", "h1", "h2", "h3", "h4", "h5", * > "h6", "head", "hr", "i", "img", "li", "listing", "menu", "meta", "nobr", "ol", * > "p", "pre", "ruby", "s", "small", "span", "strong", "strike", "sub", "sup", * > "table", "tt", "u", "ul", "var" * * > A start tag whose name is "font", if the token has any attributes named "color", "face", or "size" * * > An end tag whose tag name is "br", "p" * * Closing BR tags are always reported by the Tag Processor as opening tags. */ case '+B': case '+BIG': case '+BLOCKQUOTE': case '+BODY': case '+BR': case '+CENTER': case '+CODE': case '+DD': case '+DIV': case '+DL': case '+DT': case '+EM': case '+EMBED': case '+H1': case '+H2': case '+H3': case '+H4': case '+H5': case '+H6': case '+HEAD': case '+HR': case '+I': case '+IMG': case '+LI': case '+LISTING': case '+MENU': case '+META': case '+NOBR': case '+OL': case '+P': case '+PRE': case '+RUBY': case '+S': case '+SMALL': case '+SPAN': case '+STRONG': case '+STRIKE': case '+SUB': case '+SUP': case '+TABLE': case '+TT': case '+U': case '+UL': case '+VAR': case '+FONT with attributes': case '-BR': case '-P': // @todo Indicate a parse error once it's possible. foreach ( $this->state->stack_of_open_elements->walk_up() as $current_node ) { if ( 'math' === $current_node->integration_node_type || 'html' === $current_node->integration_node_type || 'html' === $current_node->namespace ) { break; } $this->state->stack_of_open_elements->pop(); } goto in_foreign_content_process_in_current_insertion_mode; } /* * > Any other start tag */ if ( ! $this->is_tag_closer() ) { $this->insert_foreign_element( $this->state->current_token, false ); /* * > If the token has its self-closing flag set, then run * > the appropriate steps from the following list: * > * > ↪ the token's tag name is "script", and the new current node is in the SVG namespace * > Acknowledge the token's self-closing flag, and then act as * > described in the steps for a "script" end tag below. * > * > ↪ Otherwise * > Pop the current node off the stack of open elements and * > acknowledge the token's self-closing flag. * * Since the rules for SCRIPT below indicate to pop the element off of the stack of * open elements, which is the same for the Otherwise condition, there's no need to * separate these checks. The difference comes when a parser operates with the scripting * flag enabled, and executes the script, which this parser does not support. */ if ( $this->state->current_token->has_self_closing_flag ) { $this->state->stack_of_open_elements->pop(); } return true; } /* * > An end tag whose name is "script", if the current node is an SVG script element. */ if ( $this->is_tag_closer() && 'SCRIPT' === $this->state->current_token->node_name && 'svg' === $this->state->current_token->namespace ) { $this->state->stack_of_open_elements->pop(); return true; } /* * > Any other end tag */ if ( $this->is_tag_closer() ) { $node = $this->state->stack_of_open_elements->current_node(); if ( $tag_name !== $node->node_name ) { // @todo Indicate a parse error once it's possible. } in_foreign_content_end_tag_loop: if ( $node === $this->state->stack_of_open_elements->at( 1 ) ) { return true; } /* * > If node's tag name, converted to ASCII lowercase, is the same as the tag name * > of the token, pop elements from the stack of open elements until node has * > been popped from the stack, and then return. */ if ( 0 === strcasecmp( $node->node_name, $tag_name ) ) { foreach ( $this->state->stack_of_open_elements->walk_up() as $item ) { $this->state->stack_of_open_elements->pop(); if ( $node === $item ) { return true; } } } foreach ( $this->state->stack_of_open_elements->walk_up( $node ) as $item ) { $node = $item; break; } if ( 'html' !== $node->namespace ) { goto in_foreign_content_end_tag_loop; } in_foreign_content_process_in_current_insertion_mode: switch ( $this->state->insertion_mode ) { case WP_HTML_Processor_State::INSERTION_MODE_INITIAL: return $this->step_initial(); case WP_HTML_Processor_State::INSERTION_MODE_BEFORE_HTML: return $this->step_before_html(); case WP_HTML_Processor_State::INSERTION_MODE_BEFORE_HEAD: return $this->step_before_head(); case WP_HTML_Processor_State::INSERTION_MODE_IN_HEAD: return $this->step_in_head(); case WP_HTML_Processor_State::INSERTION_MODE_IN_HEAD_NOSCRIPT: return $this->step_in_head_noscript(); case WP_HTML_Processor_State::INSERTION_MODE_AFTER_HEAD: return $this->step_after_head(); case WP_HTML_Processor_State::INSERTION_MODE_IN_BODY: return $this->step_in_body(); case WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE: return $this->step_in_table(); case WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE_TEXT: return $this->step_in_table_text(); case WP_HTML_Processor_State::INSERTION_MODE_IN_CAPTION: return $this->step_in_caption(); case WP_HTML_Processor_State::INSERTION_MODE_IN_COLUMN_GROUP: return $this->step_in_column_group(); case WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE_BODY: return $this->step_in_table_body(); case WP_HTML_Processor_State::INSERTION_MODE_IN_ROW: return $this->step_in_row(); case WP_HTML_Processor_State::INSERTION_MODE_IN_CELL: return $this->step_in_cell(); case WP_HTML_Processor_State::INSERTION_MODE_IN_SELECT: return $this->step_in_select(); case WP_HTML_Processor_State::INSERTION_MODE_IN_SELECT_IN_TABLE: return $this->step_in_select_in_table(); case WP_HTML_Processor_State::INSERTION_MODE_IN_TEMPLATE: return $this->step_in_template(); case WP_HTML_Processor_State::INSERTION_MODE_AFTER_BODY: return $this->step_after_body(); case WP_HTML_Processor_State::INSERTION_MODE_IN_FRAMESET: return $this->step_in_frameset(); case WP_HTML_Processor_State::INSERTION_MODE_AFTER_FRAMESET: return $this->step_after_frameset(); case WP_HTML_Processor_State::INSERTION_MODE_AFTER_AFTER_BODY: return $this->step_after_after_body(); case WP_HTML_Processor_State::INSERTION_MODE_AFTER_AFTER_FRAMESET: return $this->step_after_after_frameset(); // This should be unreachable but PHP doesn't have total type checking on switch. default: $this->bail( "Unaware of the requested parsing mode: '{$this->state->insertion_mode}'." ); } } $this->bail( 'Should not have been able to reach end of IN FOREIGN CONTENT processing. Check HTML API code.' ); // This unnecessary return prevents tools from inaccurately reporting type errors. return false; } /* * Internal helpers */ /** * Creates a new bookmark for the currently-matched token and returns the generated name. * * @since 6.4.0 * @since 6.5.0 Renamed from bookmark_tag() to bookmark_token(). * * @throws Exception When unable to allocate requested bookmark. * * @return string|false Name of created bookmark, or false if unable to create. */ private function bookmark_token() { if ( ! parent::set_bookmark( ++$this->bookmark_counter ) ) { $this->last_error = self::ERROR_EXCEEDED_MAX_BOOKMARKS; throw new Exception( 'could not allocate bookmark' ); } return "{$this->bookmark_counter}"; } /* * HTML semantic overrides for Tag Processor */ /** * Indicates the namespace of the current token, or "html" if there is none. * * @return string One of "html", "math", or "svg". */ public function get_namespace(): string { if ( ! isset( $this->current_element ) ) { return parent::get_namespace(); } return $this->current_element->token->namespace; } /** * Returns the uppercase name of the matched tag. * * The semantic rules for HTML specify that certain tags be reprocessed * with a different tag name. Because of this, the tag name presented * by the HTML Processor may differ from the one reported by the HTML * Tag Processor, which doesn't apply these semantic rules. * * Example: * * $processor = new WP_HTML_Tag_Processor( '<div class="test">Test</div>' ); * $processor->next_tag() === true; * $processor->get_tag() === 'DIV'; * * $processor->next_tag() === false; * $processor->get_tag() === null; * * @since 6.4.0 * * @return string|null Name of currently matched tag in input HTML, or `null` if none found. */ public function get_tag(): ?string { if ( null !== $this->last_error ) { return null; } if ( $this->is_virtual() ) { return $this->current_element->token->node_name; } $tag_name = parent::get_tag(); /* * > A start tag whose tag name is "image" * > Change the token's tag name to "img" and reprocess it. (Don't ask.) */ return ( 'IMAGE' === $tag_name && 'html' === $this->get_namespace() ) ? 'IMG' : $tag_name; } /** * Indicates if the currently matched tag contains the self-closing flag. * * No HTML elements ought to have the self-closing flag and for those, the self-closing * flag will be ignored. For void elements this is benign because they "self close" * automatically. For non-void HTML elements though problems will appear if someone * intends to use a self-closing element in place of that element with an empty body. * For HTML foreign elements and custom elements the self-closing flag determines if * they self-close or not. * * This function does not determine if a tag is self-closing, * but only if the self-closing flag is present in the syntax. * * @since 6.6.0 Subclassed for the HTML Processor. * * @return bool Whether the currently matched tag contains the self-closing flag. */ public function has_self_closing_flag(): bool { return $this->is_virtual() ? false : parent::has_self_closing_flag(); } /** * Returns the node name represented by the token. * * This matches the DOM API value `nodeName`. Some values * are static, such as `#text` for a text node, while others * are dynamically generated from the token itself. * * Dynamic names: * - Uppercase tag name for tag matches. * - `html` for DOCTYPE declarations. * * Note that if the Tag Processor is not matched on a token * then this function will return `null`, either because it * hasn't yet found a token or because it reached the end * of the document without matching a token. * * @since 6.6.0 Subclassed for the HTML Processor. * * @return string|null Name of the matched token. */ public function get_token_name(): ?string { return $this->is_virtual() ? $this->current_element->token->node_name : parent::get_token_name(); } /** * Indicates the kind of matched token, if any. * * This differs from `get_token_name()` in that it always * returns a static string indicating the type, whereas * `get_token_name()` may return values derived from the * token itself, such as a tag name or processing * instruction tag. * * Possible values: * - `#tag` when matched on a tag. * - `#text` when matched on a text node. * - `#cdata-section` when matched on a CDATA node. * - `#comment` when matched on a comment. * - `#doctype` when matched on a DOCTYPE declaration. * - `#presumptuous-tag` when matched on an empty tag closer. * - `#funky-comment` when matched on a funky comment. * * @since 6.6.0 Subclassed for the HTML Processor. * * @return string|null What kind of token is matched, or null. */ public function get_token_type(): ?string { if ( $this->is_virtual() ) { /* * This logic comes from the Tag Processor. * * @todo It would be ideal not to repeat this here, but it's not clearly * better to allow passing a token name to `get_token_type()`. */ $node_name = $this->current_element->token->node_name; $starting_char = $node_name[0]; if ( 'A' <= $starting_char && 'Z' >= $starting_char ) { return '#tag'; } if ( 'html' === $node_name ) { return '#doctype'; } return $node_name; } return parent::get_token_type(); } /** * Returns the value of a requested attribute from a matched tag opener if that attribute exists. * * Example: * * $p = WP_HTML_Processor::create_fragment( '<div enabled class="test" data-test-id="14">Test</div>' ); * $p->next_token() === true; * $p->get_attribute( 'data-test-id' ) === '14'; * $p->get_attribute( 'enabled' ) === true; * $p->get_attribute( 'aria-label' ) === null; * * $p->next_tag() === false; * $p->get_attribute( 'class' ) === null; * * @since 6.6.0 Subclassed for HTML Processor. * * @param string $name Name of attribute whose value is requested. * @return string|true|null Value of attribute or `null` if not available. Boolean attributes return `true`. */ public function get_attribute( $name ) { return $this->is_virtual() ? null : parent::get_attribute( $name ); } /** * Updates or creates a new attribute on the currently matched tag with the passed value. * * This function handles all necessary HTML encoding. Provide normal, unescaped string values. * The HTML API will encode the strings appropriately so that the browser will interpret them * as the intended value. * * Example: * * // Renders “Eggs & Milk” in a browser, encoded as `<abbr title="Eggs &amp; Milk">`. * $processor->set_attribute( 'title', 'Eggs & Milk' ); * * // Renders “Eggs &amp; Milk” in a browser, encoded as `<abbr title="Eggs &amp;amp; Milk">`. * $processor->set_attribute( 'title', 'Eggs &amp; Milk' ); * * // Renders `true` as `<abbr title>`. * $processor->set_attribute( 'title', true ); * * // Renders without the attribute for `false` as `<abbr>`. * $processor->set_attribute( 'title', false ); * * Special handling is provided for boolean attribute values: * - When `true` is passed as the value, then only the attribute name is added to the tag. * - When `false` is passed, the attribute gets removed if it existed before. * * @since 6.6.0 Subclassed for the HTML Processor. * @since 6.9.0 Escapes all character references instead of trying to avoid double-escaping. * * @param string $name The attribute name to target. * @param string|bool $value The new attribute value. * @return bool Whether an attribute value was set. */ public function set_attribute( $name, $value ): bool { return $this->is_virtual() ? false : parent::set_attribute( $name, $value ); } /** * Remove an attribute from the currently-matched tag. * * @since 6.6.0 Subclassed for HTML Processor. * * @param string $name The attribute name to remove. * @return bool Whether an attribute was removed. */ public function remove_attribute( $name ): bool { return $this->is_virtual() ? false : parent::remove_attribute( $name ); } /** * Gets lowercase names of all attributes matching a given prefix in the current tag. * * Note that matching is case-insensitive. This is in accordance with the spec: * * > There must never be two or more attributes on * > the same start tag whose names are an ASCII * > case-insensitive match for each other. * - HTML 5 spec * * Example: * * $p = new WP_HTML_Tag_Processor( '<div data-ENABLED class="test" DATA-test-id="14">Test</div>' ); * $p->next_tag( array( 'class_name' => 'test' ) ) === true; * $p->get_attribute_names_with_prefix( 'data-' ) === array( 'data-enabled', 'data-test-id' ); * * $p->next_tag() === false; * $p->get_attribute_names_with_prefix( 'data-' ) === null; * * @since 6.6.0 Subclassed for the HTML Processor. * * @see https://html.spec.whatwg.org/multipage/syntax.html#attributes-2:ascii-case-insensitive * * @param string $prefix Prefix of requested attribute names. * @return array|null List of attribute names, or `null` when no tag opener is matched. */ public function get_attribute_names_with_prefix( $prefix ): ?array { return $this->is_virtual() ? null : parent::get_attribute_names_with_prefix( $prefix ); } /** * Adds a new class name to the currently matched tag. * * @since 6.6.0 Subclassed for the HTML Processor. * * @param string $class_name The class name to add. * @return bool Whether the class was set to be added. */ public function add_class( $class_name ): bool { return $this->is_virtual() ? false : parent::add_class( $class_name ); } /** * Removes a class name from the currently matched tag. * * @since 6.6.0 Subclassed for the HTML Processor. * * @param string $class_name The class name to remove. * @return bool Whether the class was set to be removed. */ public function remove_class( $class_name ): bool { return $this->is_virtual() ? false : parent::remove_class( $class_name ); } /** * Returns if a matched tag contains the given ASCII case-insensitive class name. * * @since 6.6.0 Subclassed for the HTML Processor. * * @todo When reconstructing active formatting elements with attributes, find a way * to indicate if the virtually-reconstructed formatting elements contain the * wanted class name. * * @param string $wanted_class Look for this CSS class name, ASCII case-insensitive. * @return bool|null Whether the matched tag contains the given class name, or null if not matched. */ public function has_class( $wanted_class ): ?bool { return $this->is_virtual() ? null : parent::has_class( $wanted_class ); } /** * Generator for a foreach loop to step through each class name for the matched tag. * * This generator function is designed to be used inside a "foreach" loop. * * Example: * * $p = WP_HTML_Processor::create_fragment( "<div class='free &lt;egg&lt;\tlang-en'>" ); * $p->next_tag(); * foreach ( $p->class_list() as $class_name ) { * echo "{$class_name} "; * } * // Outputs: "free <egg> lang-en " * * @since 6.6.0 Subclassed for the HTML Processor. */ public function class_list() { return $this->is_virtual() ? null : parent::class_list(); } /** * Returns the modifiable text for a matched token, or an empty string. * * Modifiable text is text content that may be read and changed without * changing the HTML structure of the document around it. This includes * the contents of `#text` nodes in the HTML as well as the inner * contents of HTML comments, Processing Instructions, and others, even * though these nodes aren't part of a parsed DOM tree. They also contain * the contents of SCRIPT and STYLE tags, of TEXTAREA tags, and of any * other section in an HTML document which cannot contain HTML markup (DATA). * * If a token has no modifiable text then an empty string is returned to * avoid needless crashing or type errors. An empty string does not mean * that a token has modifiable text, and a token with modifiable text may * have an empty string (e.g. a comment with no contents). * * @since 6.6.0 Subclassed for the HTML Processor. * * @return string */ public function get_modifiable_text(): string { return $this->is_virtual() ? '' : parent::get_modifiable_text(); } /** * Indicates what kind of comment produced the comment node. * * Because there are different kinds of HTML syntax which produce * comments, the Tag Processor tracks and exposes this as a type * for the comment. Nominally only regular HTML comments exist as * they are commonly known, but a number of unrelated syntax errors * also produce comments. * * @see self::COMMENT_AS_ABRUPTLY_CLOSED_COMMENT * @see self::COMMENT_AS_CDATA_LOOKALIKE * @see self::COMMENT_AS_INVALID_HTML * @see self::COMMENT_AS_HTML_COMMENT * @see self::COMMENT_AS_PI_NODE_LOOKALIKE * * @since 6.6.0 Subclassed for the HTML Processor. * * @return string|null */ public function get_comment_type(): ?string { return $this->is_virtual() ? null : parent::get_comment_type(); } /** * Removes a bookmark that is no longer needed. * * Releasing a bookmark frees up the small * performance overhead it requires. * * @since 6.4.0 * * @param string $bookmark_name Name of the bookmark to remove. * @return bool Whether the bookmark already existed before removal. */ public function release_bookmark( $bookmark_name ): bool { return parent::release_bookmark( "_{$bookmark_name}" ); } /** * Moves the internal cursor in the HTML Processor to a given bookmark's location. * * Be careful! Seeking backwards to a previous location resets the parser to the * start of the document and reparses the entire contents up until it finds the * sought-after bookmarked location. * * In order to prevent accidental infinite loops, there's a * maximum limit on the number of times seek() can be called. * * @throws Exception When unable to allocate a bookmark for the next token in the input HTML document. * * @since 6.4.0 * * @param string $bookmark_name Jump to the place in the document identified by this bookmark name. * @return bool Whether the internal cursor was successfully moved to the bookmark's location. */ public function seek( $bookmark_name ): bool { // Flush any pending updates to the document before beginning. $this->get_updated_html(); $actual_bookmark_name = "_{$bookmark_name}"; $processor_started_at = $this->state->current_token ? $this->bookmarks[ $this->state->current_token->bookmark_name ]->start : 0; $bookmark_starts_at = $this->bookmarks[ $actual_bookmark_name ]->start; $direction = $bookmark_starts_at > $processor_started_at ? 'forward' : 'backward'; /* * If seeking backwards, it's possible that the sought-after bookmark exists within an element * which has been closed before the current cursor; in other words, it has already been removed * from the stack of open elements. This means that it's insufficient to simply pop off elements * from the stack of open elements which appear after the bookmarked location and then jump to * that location, as the elements which were open before won't be re-opened. * * In order to maintain consistency, the HTML Processor rewinds to the start of the document * and reparses everything until it finds the sought-after bookmark. * * There are potentially better ways to do this: cache the parser state for each bookmark and * restore it when seeking; store an immutable and idempotent register of where elements open * and close. * * If caching the parser state it will be essential to properly maintain the cached stack of * open elements and active formatting elements when modifying the document. This could be a * tedious and time-consuming process as well, and so for now will not be performed. * * It may be possible to track bookmarks for where elements open and close, and in doing so * be able to quickly recalculate breadcrumbs for any element in the document. It may even * be possible to remove the stack of open elements and compute it on the fly this way. * If doing this, the parser would need to track the opening and closing locations for all * tokens in the breadcrumb path for any and all bookmarks. By utilizing bookmarks themselves * this list could be automatically maintained while modifying the document. Finding the * breadcrumbs would then amount to traversing that list from the start until the token * being inspected. Once an element closes, if there are no bookmarks pointing to locations * within that element, then all of these locations may be forgotten to save on memory use * and computation time. */ if ( 'backward' === $direction ) { /* * When moving backward, stateful stacks should be cleared. */ foreach ( $this->state->stack_of_open_elements->walk_up() as $item ) { $this->state->stack_of_open_elements->remove_node( $item ); } foreach ( $this->state->active_formatting_elements->walk_up() as $item ) { $this->state->active_formatting_elements->remove_node( $item ); } /* * **After** clearing stacks, more processor state can be reset. * This must be done after clearing the stack because those stacks generate events that * would appear on a subsequent call to `next_token()`. */ $this->state->frameset_ok = true; $this->state->stack_of_template_insertion_modes = array(); $this->state->head_element = null; $this->state->form_element = null; $this->state->current_token = null; $this->current_element = null; $this->element_queue = array(); /* * The absence of a context node indicates a full parse. * The presence of a context node indicates a fragment parser. */ if ( null === $this->context_node ) { $this->change_parsing_namespace( 'html' ); $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_INITIAL; $this->breadcrumbs = array(); $this->bookmarks['initial'] = new WP_HTML_Span( 0, 0 ); parent::seek( 'initial' ); unset( $this->bookmarks['initial'] ); } else { /* * Push the root-node (HTML) back onto the stack of open elements. * * Fragment parsers require this extra bit of setup. * It's handled in full parsers by advancing the processor state. */ $this->state->stack_of_open_elements->push( new WP_HTML_Token( 'root-node', 'HTML', false ) ); $this->change_parsing_namespace( $this->context_node->integration_node_type ? 'html' : $this->context_node->namespace ); if ( 'TEMPLATE' === $this->context_node->node_name ) { $this->state->stack_of_template_insertion_modes[] = WP_HTML_Processor_State::INSERTION_MODE_IN_TEMPLATE; } $this->reset_insertion_mode_appropriately(); $this->breadcrumbs = array_slice( $this->breadcrumbs, 0, 2 ); parent::seek( $this->context_node->bookmark_name ); } } /* * Here, the processor moves forward through the document until it matches the bookmark. * do-while is used here because the processor is expected to already be stopped on * a token than may match the bookmarked location. */ do { /* * The processor will stop on virtual tokens, but bookmarks may not be set on them. * They should not be matched when seeking a bookmark, skip them. */ if ( $this->is_virtual() ) { continue; } if ( $bookmark_starts_at === $this->bookmarks[ $this->state->current_token->bookmark_name ]->start ) { return true; } } while ( $this->next_token() ); return false; } /** * Sets a bookmark in the HTML document. * * Bookmarks represent specific places or tokens in the HTML * document, such as a tag opener or closer. When applying * edits to a document, such as setting an attribute, the * text offsets of that token may shift; the bookmark is * kept updated with those shifts and remains stable unless * the entire span of text in which the token sits is removed. * * Release bookmarks when they are no longer needed. * * Example: * * <main><h2>Surprising fact you may not know!</h2></main> * ^ ^ * \-|-- this `H2` opener bookmark tracks the token * * <main class="clickbait"><h2>Surprising fact you may no… * ^ ^ * \-|-- it shifts with edits * * Bookmarks provide the ability to seek to a previously-scanned * place in the HTML document. This avoids the need to re-scan * the entire document. * * Example: * * <ul><li>One</li><li>Two</li><li>Three</li></ul> * ^^^^ * want to note this last item * * $p = new WP_HTML_Tag_Processor( $html ); * $in_list = false; * while ( $p->next_tag( array( 'tag_closers' => $in_list ? 'visit' : 'skip' ) ) ) { * if ( 'UL' === $p->get_tag() ) { * if ( $p->is_tag_closer() ) { * $in_list = false; * $p->set_bookmark( 'resume' ); * if ( $p->seek( 'last-li' ) ) { * $p->add_class( 'last-li' ); * } * $p->seek( 'resume' ); * $p->release_bookmark( 'last-li' ); * $p->release_bookmark( 'resume' ); * } else { * $in_list = true; * } * } * * if ( 'LI' === $p->get_tag() ) { * $p->set_bookmark( 'last-li' ); * } * } * * Bookmarks intentionally hide the internal string offsets * to which they refer. They are maintained internally as * updates are applied to the HTML document and therefore * retain their "position" - the location to which they * originally pointed. The inability to use bookmarks with * functions like `substr` is therefore intentional to guard * against accidentally breaking the HTML. * * Because bookmarks allocate memory and require processing * for every applied update, they are limited and require * a name. They should not be created with programmatically-made * names, such as "li_{$index}" with some loop. As a general * rule they should only be created with string-literal names * like "start-of-section" or "last-paragraph". * * Bookmarks are a powerful tool to enable complicated behavior. * Consider double-checking that you need this tool if you are * reaching for it, as inappropriate use could lead to broken * HTML structure or unwanted processing overhead. * * Bookmarks cannot be set on tokens that do no appear in the original * HTML text. For example, the HTML `<table><td>` stops at tags `TABLE`, * `TBODY`, `TR`, and `TD`. The `TBODY` and `TR` tags do not appear in * the original HTML and cannot be used as bookmarks. * * @since 6.4.0 * * @param string $bookmark_name Identifies this particular bookmark. * @return bool Whether the bookmark was successfully created. */ public function set_bookmark( $bookmark_name ): bool { if ( $this->is_virtual() ) { _doing_it_wrong( __METHOD__, __( 'Cannot set bookmarks on tokens that do no appear in the original HTML text.' ), '6.8.0' ); return false; } return parent::set_bookmark( "_{$bookmark_name}" ); } /** * Checks whether a bookmark with the given name exists. * * @since 6.5.0 * * @param string $bookmark_name Name to identify a bookmark that potentially exists. * @return bool Whether that bookmark exists. */ public function has_bookmark( $bookmark_name ): bool { return parent::has_bookmark( "_{$bookmark_name}" ); } /* * HTML Parsing Algorithms */ /** * Closes a P element. * * @since 6.4.0 * * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. * * @see https://html.spec.whatwg.org/#close-a-p-element */ private function close_a_p_element(): void { $this->generate_implied_end_tags( 'P' ); $this->state->stack_of_open_elements->pop_until( 'P' ); } /** * Closes elements that have implied end tags. * * @since 6.4.0 * @since 6.7.0 Full spec support. * * @see https://html.spec.whatwg.org/#generate-implied-end-tags * * @param string|null $except_for_this_element Perform as if this element doesn't exist in the stack of open elements. */ private function generate_implied_end_tags( ?string $except_for_this_element = null ): void { $elements_with_implied_end_tags = array( 'DD', 'DT', 'LI', 'OPTGROUP', 'OPTION', 'P', 'RB', 'RP', 'RT', 'RTC', ); $no_exclusions = ! isset( $except_for_this_element ); while ( ( $no_exclusions || ! $this->state->stack_of_open_elements->current_node_is( $except_for_this_element ) ) && in_array( $this->state->stack_of_open_elements->current_node()->node_name, $elements_with_implied_end_tags, true ) ) { $this->state->stack_of_open_elements->pop(); } } /** * Closes elements that have implied end tags, thoroughly. * * See the HTML specification for an explanation why this is * different from generating end tags in the normal sense. * * @since 6.4.0 * @since 6.7.0 Full spec support. * * @see WP_HTML_Processor::generate_implied_end_tags * @see https://html.spec.whatwg.org/#generate-implied-end-tags */ private function generate_implied_end_tags_thoroughly(): void { $elements_with_implied_end_tags = array( 'CAPTION', 'COLGROUP', 'DD', 'DT', 'LI', 'OPTGROUP', 'OPTION', 'P', 'RB', 'RP', 'RT', 'RTC', 'TBODY', 'TD', 'TFOOT', 'TH', 'THEAD', 'TR', ); while ( in_array( $this->state->stack_of_open_elements->current_node()->node_name, $elements_with_implied_end_tags, true ) ) { $this->state->stack_of_open_elements->pop(); } } /** * Returns the adjusted current node. * * > The adjusted current node is the context element if the parser was created as * > part of the HTML fragment parsing algorithm and the stack of open elements * > has only one element in it (fragment case); otherwise, the adjusted current * > node is the current node. * * @see https://html.spec.whatwg.org/#adjusted-current-node * * @since 6.7.0 * * @return WP_HTML_Token|null The adjusted current node. */ private function get_adjusted_current_node(): ?WP_HTML_Token { if ( isset( $this->context_node ) && 1 === $this->state->stack_of_open_elements->count() ) { return $this->context_node; } return $this->state->stack_of_open_elements->current_node(); } /** * Reconstructs the active formatting elements. * * > This has the effect of reopening all the formatting elements that were opened * > in the current body, cell, or caption (whichever is youngest) that haven't * > been explicitly closed. * * @since 6.4.0 * * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. * * @see https://html.spec.whatwg.org/#reconstruct-the-active-formatting-elements * * @return bool Whether any formatting elements needed to be reconstructed. */ private function reconstruct_active_formatting_elements(): bool { /* * > If there are no entries in the list of active formatting elements, then there is nothing * > to reconstruct; stop this algorithm. */ if ( 0 === $this->state->active_formatting_elements->count() ) { return false; } $last_entry = $this->state->active_formatting_elements->current_node(); if ( /* * > If the last (most recently added) entry in the list of active formatting elements is a marker; * > stop this algorithm. */ 'marker' === $last_entry->node_name || /* * > If the last (most recently added) entry in the list of active formatting elements is an * > element that is in the stack of open elements, then there is nothing to reconstruct; * > stop this algorithm. */ $this->state->stack_of_open_elements->contains_node( $last_entry ) ) { return false; } $this->bail( 'Cannot reconstruct active formatting elements when advancing and rewinding is required.' ); } /** * Runs the reset the insertion mode appropriately algorithm. * * @since 6.7.0 * * @see https://html.spec.whatwg.org/multipage/parsing.html#reset-the-insertion-mode-appropriately */ private function reset_insertion_mode_appropriately(): void { // Set the first node. $first_node = null; foreach ( $this->state->stack_of_open_elements->walk_down() as $first_node ) { break; } /* * > 1. Let _last_ be false. */ $last = false; foreach ( $this->state->stack_of_open_elements->walk_up() as $node ) { /* * > 2. Let _node_ be the last node in the stack of open elements. * > 3. _Loop_: If _node_ is the first node in the stack of open elements, then set _last_ * > to true, and, if the parser was created as part of the HTML fragment parsing * > algorithm (fragment case), set node to the context element passed to * > that algorithm. * > … */ if ( $node === $first_node ) { $last = true; if ( isset( $this->context_node ) ) { $node = $this->context_node; } } // All of the following rules are for matching HTML elements. if ( 'html' !== $node->namespace ) { continue; } switch ( $node->node_name ) { /* * > 4. If node is a `select` element, run these substeps: * > 1. If _last_ is true, jump to the step below labeled done. * > 2. Let _ancestor_ be _node_. * > 3. _Loop_: If _ancestor_ is the first node in the stack of open elements, * > jump to the step below labeled done. * > 4. Let ancestor be the node before ancestor in the stack of open elements. * > … * > 7. Jump back to the step labeled _loop_. * > 8. _Done_: Switch the insertion mode to "in select" and return. */ case 'SELECT': if ( ! $last ) { foreach ( $this->state->stack_of_open_elements->walk_up( $node ) as $ancestor ) { if ( 'html' !== $ancestor->namespace ) { continue; } switch ( $ancestor->node_name ) { /* * > 5. If _ancestor_ is a `template` node, jump to the step below * > labeled _done_. */ case 'TEMPLATE': break 2; /* * > 6. If _ancestor_ is a `table` node, switch the insertion mode to * > "in select in table" and return. */ case 'TABLE': $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_SELECT_IN_TABLE; return; } } } $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_SELECT; return; /* * > 5. If _node_ is a `td` or `th` element and _last_ is false, then switch the * > insertion mode to "in cell" and return. */ case 'TD': case 'TH': if ( ! $last ) { $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_CELL; return; } break; /* * > 6. If _node_ is a `tr` element, then switch the insertion mode to "in row" * > and return. */ case 'TR': $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_ROW; return; /* * > 7. If _node_ is a `tbody`, `thead`, or `tfoot` element, then switch the * > insertion mode to "in table body" and return. */ case 'TBODY': case 'THEAD': case 'TFOOT': $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE_BODY; return; /* * > 8. If _node_ is a `caption` element, then switch the insertion mode to * > "in caption" and return. */ case 'CAPTION': $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_CAPTION; return; /* * > 9. If _node_ is a `colgroup` element, then switch the insertion mode to * > "in column group" and return. */ case 'COLGROUP': $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_COLUMN_GROUP; return; /* * > 10. If _node_ is a `table` element, then switch the insertion mode to * > "in table" and return. */ case 'TABLE': $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE; return; /* * > 11. If _node_ is a `template` element, then switch the insertion mode to the * > current template insertion mode and return. */ case 'TEMPLATE': $this->state->insertion_mode = end( $this->state->stack_of_template_insertion_modes ); return; /* * > 12. If _node_ is a `head` element and _last_ is false, then switch the * > insertion mode to "in head" and return. */ case 'HEAD': if ( ! $last ) { $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_HEAD; return; } break; /* * > 13. If _node_ is a `body` element, then switch the insertion mode to "in body" * > and return. */ case 'BODY': $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_BODY; return; /* * > 14. If _node_ is a `frameset` element, then switch the insertion mode to * > "in frameset" and return. (fragment case) */ case 'FRAMESET': $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_FRAMESET; return; /* * > 15. If _node_ is an `html` element, run these substeps: * > 1. If the head element pointer is null, switch the insertion mode to * > "before head" and return. (fragment case) * > 2. Otherwise, the head element pointer is not null, switch the insertion * > mode to "after head" and return. */ case 'HTML': $this->state->insertion_mode = isset( $this->state->head_element ) ? WP_HTML_Processor_State::INSERTION_MODE_AFTER_HEAD : WP_HTML_Processor_State::INSERTION_MODE_BEFORE_HEAD; return; } } /* * > 16. If _last_ is true, then switch the insertion mode to "in body" * > and return. (fragment case) * * This is only reachable if `$last` is true, as per the fragment parsing case. */ $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_BODY; } /** * Runs the adoption agency algorithm. * * @since 6.4.0 * * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. * * @see https://html.spec.whatwg.org/#adoption-agency-algorithm */ private function run_adoption_agency_algorithm(): void { $budget = 1000; $subject = $this->get_tag(); $current_node = $this->state->stack_of_open_elements->current_node(); if ( // > If the current node is an HTML element whose tag name is subject $current_node && $subject === $current_node->node_name && // > the current node is not in the list of active formatting elements ! $this->state->active_formatting_elements->contains_node( $current_node ) ) { $this->state->stack_of_open_elements->pop(); return; } $outer_loop_counter = 0; while ( $budget-- > 0 ) { if ( $outer_loop_counter++ >= 8 ) { return; } /* * > Let formatting element be the last element in the list of active formatting elements that: * > - is between the end of the list and the last marker in the list, * > if any, or the start of the list otherwise, * > - and has the tag name subject. */ $formatting_element = null; foreach ( $this->state->active_formatting_elements->walk_up() as $item ) { if ( 'marker' === $item->node_name ) { break; } if ( $subject === $item->node_name ) { $formatting_element = $item; break; } } // > If there is no such element, then return and instead act as described in the "any other end tag" entry above. if ( null === $formatting_element ) { $this->bail( 'Cannot run adoption agency when "any other end tag" is required.' ); } // > If formatting element is not in the stack of open elements, then this is a parse error; remove the element from the list, and return. if ( ! $this->state->stack_of_open_elements->contains_node( $formatting_element ) ) { $this->state->active_formatting_elements->remove_node( $formatting_element ); return; } // > If formatting element is in the stack of open elements, but the element is not in scope, then this is a parse error; return. if ( ! $this->state->stack_of_open_elements->has_element_in_scope( $formatting_element->node_name ) ) { return; } /* * > Let furthest block be the topmost node in the stack of open elements that is lower in the stack * > than formatting element, and is an element in the special category. There might not be one. */ $is_above_formatting_element = true; $furthest_block = null; foreach ( $this->state->stack_of_open_elements->walk_down() as $item ) { if ( $is_above_formatting_element && $formatting_element->bookmark_name !== $item->bookmark_name ) { continue; } if ( $is_above_formatting_element ) { $is_above_formatting_element = false; continue; } if ( self::is_special( $item ) ) { $furthest_block = $item; break; } } /* * > If there is no furthest block, then the UA must first pop all the nodes from the bottom of the * > stack of open elements, from the current node up to and including formatting element, then * > remove formatting element from the list of active formatting elements, and finally return. */ if ( null === $furthest_block ) { foreach ( $this->state->stack_of_open_elements->walk_up() as $item ) { $this->state->stack_of_open_elements->pop(); if ( $formatting_element->bookmark_name === $item->bookmark_name ) { $this->state->active_formatting_elements->remove_node( $formatting_element ); return; } } } $this->bail( 'Cannot extract common ancestor in adoption agency algorithm.' ); } $this->bail( 'Cannot run adoption agency when looping required.' ); } /** * Runs the "close the cell" algorithm. * * > Where the steps above say to close the cell, they mean to run the following algorithm: * > 1. Generate implied end tags. * > 2. If the current node is not now a td element or a th element, then this is a parse error. * > 3. Pop elements from the stack of open elements stack until a td element or a th element has been popped from the stack. * > 4. Clear the list of active formatting elements up to the last marker. * > 5. Switch the insertion mode to "in row". * * @see https://html.spec.whatwg.org/multipage/parsing.html#close-the-cell * * @since 6.7.0 */ private function close_cell(): void { $this->generate_implied_end_tags(); // @todo Parse error if the current node is a "td" or "th" element. foreach ( $this->state->stack_of_open_elements->walk_up() as $element ) { $this->state->stack_of_open_elements->pop(); if ( 'TD' === $element->node_name || 'TH' === $element->node_name ) { break; } } $this->state->active_formatting_elements->clear_up_to_last_marker(); $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_ROW; } /** * Inserts an HTML element on the stack of open elements. * * @since 6.4.0 * * @see https://html.spec.whatwg.org/#insert-a-foreign-element * * @param WP_HTML_Token $token Name of bookmark pointing to element in original input HTML. */ private function insert_html_element( WP_HTML_Token $token ): void { $this->state->stack_of_open_elements->push( $token ); } /** * Inserts a foreign element on to the stack of open elements. * * @since 6.7.0 * * @see https://html.spec.whatwg.org/#insert-a-foreign-element * * @param WP_HTML_Token $token Insert this token. The token's namespace and * insertion point will be updated correctly. * @param bool $only_add_to_element_stack Whether to skip the "insert an element at the adjusted * insertion location" algorithm when adding this element. */ private function insert_foreign_element( WP_HTML_Token $token, bool $only_add_to_element_stack ): void { $adjusted_current_node = $this->get_adjusted_current_node(); $token->namespace = $adjusted_current_node ? $adjusted_current_node->namespace : 'html'; if ( $this->is_mathml_integration_point() ) { $token->integration_node_type = 'math'; } elseif ( $this->is_html_integration_point() ) { $token->integration_node_type = 'html'; } if ( false === $only_add_to_element_stack ) { /* * @todo Implement the "appropriate place for inserting a node" and the * "insert an element at the adjusted insertion location" algorithms. * * These algorithms mostly impacts DOM tree construction and not the HTML API. * Here, there's no DOM node onto which the element will be appended, so the * parser will skip this step. * * @see https://html.spec.whatwg.org/#insert-an-element-at-the-adjusted-insertion-location */ } $this->insert_html_element( $token ); } /** * Inserts a virtual element on the stack of open elements. * * @since 6.7.0 * * @param string $token_name Name of token to create and insert into the stack of open elements. * @param string|null $bookmark_name Optional. Name to give bookmark for created virtual node. * Defaults to auto-creating a bookmark name. * @return WP_HTML_Token Newly-created virtual token. */ private function insert_virtual_node( $token_name, $bookmark_name = null ): WP_HTML_Token { $here = $this->bookmarks[ $this->state->current_token->bookmark_name ]; $name = $bookmark_name ?? $this->bookmark_token(); $this->bookmarks[ $name ] = new WP_HTML_Span( $here->start, 0 ); $token = new WP_HTML_Token( $name, $token_name, false ); $this->insert_html_element( $token ); return $token; } /* * HTML Specification Helpers */ /** * Indicates if the current token is a MathML integration point. * * @since 6.7.0 * * @see https://html.spec.whatwg.org/#mathml-text-integration-point * * @return bool Whether the current token is a MathML integration point. */ private function is_mathml_integration_point(): bool { $current_token = $this->state->current_token; if ( ! isset( $current_token ) ) { return false; } if ( 'math' !== $current_token->namespace || 'M' !== $current_token->node_name[0] ) { return false; } $tag_name = $current_token->node_name; return ( 'MI' === $tag_name || 'MO' === $tag_name || 'MN' === $tag_name || 'MS' === $tag_name || 'MTEXT' === $tag_name ); } /** * Indicates if the current token is an HTML integration point. * * Note that this method must be an instance method with access * to the current token, since it needs to examine the attributes * of the currently-matched tag, if it's in the MathML namespace. * Otherwise it would be required to scan the HTML and ensure that * no other accounting is overlooked. * * @since 6.7.0 * * @see https://html.spec.whatwg.org/#html-integration-point * * @return bool Whether the current token is an HTML integration point. */ private function is_html_integration_point(): bool { $current_token = $this->state->current_token; if ( ! isset( $current_token ) ) { return false; } if ( 'html' === $current_token->namespace ) { return false; } $tag_name = $current_token->node_name; if ( 'svg' === $current_token->namespace ) { return ( 'DESC' === $tag_name || 'FOREIGNOBJECT' === $tag_name || 'TITLE' === $tag_name ); } if ( 'math' === $current_token->namespace ) { if ( 'ANNOTATION-XML' !== $tag_name ) { return false; } $encoding = $this->get_attribute( 'encoding' ); return ( is_string( $encoding ) && ( 0 === strcasecmp( $encoding, 'application/xhtml+xml' ) || 0 === strcasecmp( $encoding, 'text/html' ) ) ); } $this->bail( 'Should not have reached end of HTML Integration Point detection: check HTML API code.' ); // This unnecessary return prevents tools from inaccurately reporting type errors. return false; } /** * Returns whether an element of a given name is in the HTML special category. * * @since 6.4.0 * * @see https://html.spec.whatwg.org/#special * * @param WP_HTML_Token|string $tag_name Node to check, or only its name if in the HTML namespace. * @return bool Whether the element of the given name is in the special category. */ public static function is_special( $tag_name ): bool { if ( is_string( $tag_name ) ) { $tag_name = strtoupper( $tag_name ); } else { $tag_name = 'html' === $tag_name->namespace ? strtoupper( $tag_name->node_name ) : "{$tag_name->namespace} {$tag_name->node_name}"; } return ( 'ADDRESS' === $tag_name || 'APPLET' === $tag_name || 'AREA' === $tag_name || 'ARTICLE' === $tag_name || 'ASIDE' === $tag_name || 'BASE' === $tag_name || 'BASEFONT' === $tag_name || 'BGSOUND' === $tag_name || 'BLOCKQUOTE' === $tag_name || 'BODY' === $tag_name || 'BR' === $tag_name || 'BUTTON' === $tag_name || 'CAPTION' === $tag_name || 'CENTER' === $tag_name || 'COL' === $tag_name || 'COLGROUP' === $tag_name || 'DD' === $tag_name || 'DETAILS' === $tag_name || 'DIR' === $tag_name || 'DIV' === $tag_name || 'DL' === $tag_name || 'DT' === $tag_name || 'EMBED' === $tag_name || 'FIELDSET' === $tag_name || 'FIGCAPTION' === $tag_name || 'FIGURE' === $tag_name || 'FOOTER' === $tag_name || 'FORM' === $tag_name || 'FRAME' === $tag_name || 'FRAMESET' === $tag_name || 'H1' === $tag_name || 'H2' === $tag_name || 'H3' === $tag_name || 'H4' === $tag_name || 'H5' === $tag_name || 'H6' === $tag_name || 'HEAD' === $tag_name || 'HEADER' === $tag_name || 'HGROUP' === $tag_name || 'HR' === $tag_name || 'HTML' === $tag_name || 'IFRAME' === $tag_name || 'IMG' === $tag_name || 'INPUT' === $tag_name || 'KEYGEN' === $tag_name || 'LI' === $tag_name || 'LINK' === $tag_name || 'LISTING' === $tag_name || 'MAIN' === $tag_name || 'MARQUEE' === $tag_name || 'MENU' === $tag_name || 'META' === $tag_name || 'NAV' === $tag_name || 'NOEMBED' === $tag_name || 'NOFRAMES' === $tag_name || 'NOSCRIPT' === $tag_name || 'OBJECT' === $tag_name || 'OL' === $tag_name || 'P' === $tag_name || 'PARAM' === $tag_name || 'PLAINTEXT' === $tag_name || 'PRE' === $tag_name || 'SCRIPT' === $tag_name || 'SEARCH' === $tag_name || 'SECTION' === $tag_name || 'SELECT' === $tag_name || 'SOURCE' === $tag_name || 'STYLE' === $tag_name || 'SUMMARY' === $tag_name || 'TABLE' === $tag_name || 'TBODY' === $tag_name || 'TD' === $tag_name || 'TEMPLATE' === $tag_name || 'TEXTAREA' === $tag_name || 'TFOOT' === $tag_name || 'TH' === $tag_name || 'THEAD' === $tag_name || 'TITLE' === $tag_name || 'TR' === $tag_name || 'TRACK' === $tag_name || 'UL' === $tag_name || 'WBR' === $tag_name || 'XMP' === $tag_name || // MathML. 'math MI' === $tag_name || 'math MO' === $tag_name || 'math MN' === $tag_name || 'math MS' === $tag_name || 'math MTEXT' === $tag_name || 'math ANNOTATION-XML' === $tag_name || // SVG. 'svg DESC' === $tag_name || 'svg FOREIGNOBJECT' === $tag_name || 'svg TITLE' === $tag_name ); } /** * Returns whether a given element is an HTML Void Element * * > area, base, br, col, embed, hr, img, input, link, meta, source, track, wbr * * @since 6.4.0 * * @see https://html.spec.whatwg.org/#void-elements * * @param string $tag_name Name of HTML tag to check. * @return bool Whether the given tag is an HTML Void Element. */ public static function is_void( $tag_name ): bool { $tag_name = strtoupper( $tag_name ); return ( 'AREA' === $tag_name || 'BASE' === $tag_name || 'BASEFONT' === $tag_name || // Obsolete but still treated as void. 'BGSOUND' === $tag_name || // Obsolete but still treated as void. 'BR' === $tag_name || 'COL' === $tag_name || 'EMBED' === $tag_name || 'FRAME' === $tag_name || 'HR' === $tag_name || 'IMG' === $tag_name || 'INPUT' === $tag_name || 'KEYGEN' === $tag_name || // Obsolete but still treated as void. 'LINK' === $tag_name || 'META' === $tag_name || 'PARAM' === $tag_name || // Obsolete but still treated as void. 'SOURCE' === $tag_name || 'TRACK' === $tag_name || 'WBR' === $tag_name ); } /** * Gets an encoding from a given string. * * This is an algorithm defined in the WHAT-WG specification. * * Example: * * 'UTF-8' === self::get_encoding( 'utf8' ); * 'UTF-8' === self::get_encoding( " \tUTF-8 " ); * null === self::get_encoding( 'UTF-7' ); * null === self::get_encoding( 'utf8; charset=' ); * * @see https://encoding.spec.whatwg.org/#concept-encoding-get * * @todo As this parser only supports UTF-8, only the UTF-8 * encodings are detected. Add more as desired, but the * parser will bail on non-UTF-8 encodings. * * @since 6.7.0 * * @param string $label A string which may specify a known encoding. * @return string|null Known encoding if matched, otherwise null. */ protected static function get_encoding( string $label ): ?string { /* * > Remove any leading and trailing ASCII whitespace from label. */ $label = trim( $label, " \t\f\r\n" ); /* * > If label is an ASCII case-insensitive match for any of the labels listed in the * > table below, then return the corresponding encoding; otherwise return failure. */ switch ( strtolower( $label ) ) { case 'unicode-1-1-utf-8': case 'unicode11utf8': case 'unicode20utf8': case 'utf-8': case 'utf8': case 'x-unicode20utf8': return 'UTF-8'; default: return null; } } /* * Constants that would pollute the top of the class if they were found there. */ /** * Indicates that the next HTML token should be parsed and processed. * * @since 6.4.0 * * @var string */ const PROCESS_NEXT_NODE = 'process-next-node'; /** * Indicates that the current HTML token should be reprocessed in the newly-selected insertion mode. * * @since 6.4.0 * * @var string */ const REPROCESS_CURRENT_NODE = 'reprocess-current-node'; /** * Indicates that the current HTML token should be processed without advancing the parser. * * @since 6.5.0 * * @var string */ const PROCESS_CURRENT_NODE = 'process-current-node'; /** * Indicates that the parser encountered unsupported markup and has bailed. * * @since 6.4.0 * * @var string */ const ERROR_UNSUPPORTED = 'unsupported'; /** * Indicates that the parser encountered more HTML tokens than it * was able to process and has bailed. * * @since 6.4.0 * * @var string */ const ERROR_EXCEEDED_MAX_BOOKMARKS = 'exceeded-max-bookmarks'; /** * Unlock code that must be passed into the constructor to create this class. * * This class extends the WP_HTML_Tag_Processor, which has a public class * constructor. Therefore, it's not possible to have a private constructor here. * * This unlock code is used to ensure that anyone calling the constructor is * doing so with a full understanding that it's intended to be a private API. * * @access private */ const CONSTRUCTOR_UNLOCK_CODE = 'Use WP_HTML_Processor::create_fragment() instead of calling the class constructor directly.'; }
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