mirror of
https://github.com/WordPress/WordPress.git
synced 2024-11-04 18:01:42 +01:00
c67fe4b6e5
It was a design goal of the HTML Processor to abort processing its input document when encountering unsupported markup. Unfortunately there was no test for this and so-far, the HTML Processor has paused, but continued processing in these situations. In this patch a new test ensures that the HTML Processor stops and refuses to move forward after encountering any unsupported markup. It also ensures that it doesn't report any current tag names since unsupported markup could imply that the read tag name is different than the parsed tag name. Props dmsnell. Fixes #59167. Built from https://develop.svn.wordpress.org/trunk@56493 git-svn-id: http://core.svn.wordpress.org/trunk@56005 1a063a9b-81f0-0310-95a4-ce76da25c4cd
1361 lines
41 KiB
PHP
1361 lines
41 KiB
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.
|
|
*
|
|
* ## 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::createFragment( $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 `createFragment()` 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.
|
|
*
|
|
* 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', 'IMG', '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 following list specifies the HTML tags that _are_ supported:
|
|
*
|
|
* - Links: A.
|
|
* - The formatting elements: B, BIG, CODE, EM, FONT, I, SMALL, STRIKE, STRONG, TT, U.
|
|
* - Containers: DIV, FIGCAPTION, FIGURE.
|
|
* - Paragraph: P.
|
|
* - Void elements: IMG.
|
|
*
|
|
* ### 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 specifies HTML markup that _is_ supported:
|
|
*
|
|
* - Markup involving only those tags listed above.
|
|
* - Fully-balanced and non-overlapping tags.
|
|
* - HTML with unexpected tag closers.
|
|
* - P tags after unclosed P tags.
|
|
* - A tags after unclosed A tags that don't involve any active formatting elements.
|
|
*
|
|
* @since 6.4.0
|
|
*
|
|
* @see WP_HTML_Tag_Processor
|
|
* @see https://html.spec.whatwg.org/
|
|
*/
|
|
class WP_HTML_Processor extends WP_HTML_Tag_Processor {
|
|
/**
|
|
* HTML processing requires more bookmarks than basic tag processing.
|
|
*
|
|
* @since 6.4.0
|
|
*
|
|
* @var int
|
|
*/
|
|
const MAX_BOOKMARKS = 100;
|
|
|
|
/**
|
|
* Static query for instructing the Tag Processor to visit every token.
|
|
*
|
|
* @since 6.4.0
|
|
*
|
|
* @var array
|
|
*/
|
|
const VISIT_EVERYTHING = array( 'tag_closers' => 'visit' );
|
|
|
|
/**
|
|
* 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 = null;
|
|
|
|
/**
|
|
* Used to create unique bookmark names.
|
|
*
|
|
* @since 6.4.0
|
|
*
|
|
* @var int
|
|
*/
|
|
private $bookmark_counter = 0;
|
|
|
|
/**
|
|
* Refers to the currently-matched tag, if any.
|
|
*
|
|
* @since 6.4.0
|
|
*
|
|
* @var WP_HTML_Token|null
|
|
*/
|
|
private $current_token = null;
|
|
|
|
/**
|
|
* 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;
|
|
|
|
/**
|
|
* 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
|
|
*/
|
|
private $release_internal_bookmark = 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
|
|
*
|
|
* @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 WP_HTML_Processor|null The created processor if successful, otherwise null.
|
|
*/
|
|
public static function createFragment( $html, $context = '<body>', $encoding = 'UTF-8' ) {
|
|
if ( '<body>' !== $context || 'UTF-8' !== $encoding ) {
|
|
return null;
|
|
}
|
|
|
|
$p = new self( $html, self::CONSTRUCTOR_UNLOCK_CODE );
|
|
$p->state->context_node = array( 'BODY', array() );
|
|
$p->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_BODY;
|
|
|
|
// @TODO: Create "fake" bookmarks for non-existent but implied nodes.
|
|
$p->bookmarks['root-node'] = new WP_HTML_Span( 0, 0 );
|
|
$p->bookmarks['context-node'] = new WP_HTML_Span( 0, 0 );
|
|
|
|
$p->state->stack_of_open_elements->push(
|
|
new WP_HTML_Token(
|
|
'root-node',
|
|
'HTML',
|
|
false
|
|
)
|
|
);
|
|
|
|
$p->state->stack_of_open_elements->push(
|
|
new WP_HTML_Token(
|
|
'context-node',
|
|
$p->state->context_node[0],
|
|
false
|
|
)
|
|
);
|
|
|
|
return $p;
|
|
}
|
|
|
|
/**
|
|
* Constructor.
|
|
*
|
|
* @access private
|
|
*
|
|
* @since 6.4.0
|
|
*
|
|
* @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::createFragment. */
|
|
__( 'Call %s to create an HTML Processor instead of calling the constructor directly.' ),
|
|
'<code>WP_HTML_Processor::createFragment</code>'
|
|
),
|
|
'6.4.0'
|
|
);
|
|
}
|
|
|
|
$this->state = new WP_HTML_Processor_State();
|
|
|
|
/*
|
|
* 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 = function ( $name ) {
|
|
parent::release_bookmark( $name );
|
|
};
|
|
}
|
|
|
|
/**
|
|
* 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 if it's possible to fix something or to give up.
|
|
*
|
|
* Example
|
|
*
|
|
* $p = WP_HTML_Processor::createFragment( '<template><strong><button><em><p><em>' );
|
|
* false === $p->next_tag();
|
|
* WP_HTML_Processor::ERROR_UNSUPPORTED === $p->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() {
|
|
return $this->last_error;
|
|
}
|
|
|
|
/**
|
|
* Finds the next tag matching the $query.
|
|
*
|
|
* @TODO: Support matching the class name and tag name.
|
|
*
|
|
* @since 6.4.0
|
|
*
|
|
* @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 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' )`.
|
|
* }
|
|
* @return bool Whether a tag was matched.
|
|
*/
|
|
public function next_tag( $query = null ) {
|
|
if ( null === $query ) {
|
|
while ( $this->step() ) {
|
|
if ( ! $this->is_tag_closer() ) {
|
|
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 ( ! ( array_key_exists( 'breadcrumbs', $query ) && is_array( $query['breadcrumbs'] ) ) ) {
|
|
while ( $this->step() ) {
|
|
if ( ! $this->is_tag_closer() ) {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
if ( isset( $query['tag_closers'] ) && 'visit' === $query['tag_closers'] ) {
|
|
_doing_it_wrong(
|
|
__METHOD__,
|
|
__( 'Cannot visit tag closers in HTML Processor.' ),
|
|
'6.4.0'
|
|
);
|
|
return false;
|
|
}
|
|
|
|
$breadcrumbs = $query['breadcrumbs'];
|
|
$match_offset = isset( $query['match_offset'] ) ? (int) $query['match_offset'] : 1;
|
|
|
|
$crumb = end( $breadcrumbs );
|
|
$target = strtoupper( $crumb );
|
|
while ( $match_offset > 0 && $this->step() ) {
|
|
if ( $target !== $this->get_tag() ) {
|
|
continue;
|
|
}
|
|
|
|
// Look up the stack to see if the breadcrumbs match.
|
|
foreach ( $this->state->stack_of_open_elements->walk_up() as $node ) {
|
|
if ( strtoupper( $crumb ) !== $node->node_name ) {
|
|
break;
|
|
}
|
|
|
|
$crumb = prev( $breadcrumbs );
|
|
if ( false === $crumb && 0 === --$match_offset && ! $this->is_tag_closer() ) {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
$crumb = end( $breadcrumbs );
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* 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 ) {
|
|
// Refuse to proceed if there was a previous error.
|
|
if ( null !== $this->last_error ) {
|
|
return false;
|
|
}
|
|
|
|
if ( self::PROCESS_NEXT_NODE === $node_to_process ) {
|
|
$top_node = $this->state->stack_of_open_elements->current_node();
|
|
if ( $top_node && self::is_void( $top_node->node_name ) ) {
|
|
$this->state->stack_of_open_elements->pop();
|
|
}
|
|
|
|
parent::next_tag( self::VISIT_EVERYTHING );
|
|
}
|
|
|
|
// Finish stepping when there are no more tokens in the document.
|
|
if ( null === $this->get_tag() ) {
|
|
return false;
|
|
}
|
|
|
|
$this->current_token = new WP_HTML_Token(
|
|
$this->bookmark_tag(),
|
|
$this->get_tag(),
|
|
$this->is_tag_closer(),
|
|
$this->release_internal_bookmark
|
|
);
|
|
|
|
try {
|
|
switch ( $this->state->insertion_mode ) {
|
|
case WP_HTML_Processor_State::INSERTION_MODE_IN_BODY:
|
|
return $this->step_in_body();
|
|
|
|
default:
|
|
$this->last_error = self::ERROR_UNSUPPORTED;
|
|
throw new WP_HTML_Unsupported_Exception( 'Cannot parse outside of the IN BODY 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 outer-most parent and descend toward the matched element.
|
|
*
|
|
* Example
|
|
*
|
|
* $p = WP_HTML_Processor::createFragment( '<p><strong><em><img></em></strong></p>' );
|
|
* $p->next_tag( 'IMG' );
|
|
* $p->get_breadcrumbs() === array( 'HTML', 'BODY', 'P', 'STRONG', 'EM', 'IMG' );
|
|
*
|
|
* @since 6.4.0
|
|
*
|
|
* @return string[]|null Array of tag-names representing path to matched node, if matched, otherwise null.
|
|
*/
|
|
public function get_breadcrumbs() {
|
|
if ( ! $this->get_tag() ) {
|
|
return null;
|
|
}
|
|
|
|
$breadcrumbs = array();
|
|
foreach ( $this->state->stack_of_open_elements->walk_down() as $stack_item ) {
|
|
$breadcrumbs[] = $stack_item->node_name;
|
|
}
|
|
|
|
return $breadcrumbs;
|
|
}
|
|
|
|
/**
|
|
* Parses next element in the 'in body' insertion mode.
|
|
*
|
|
* This internal function performs the 'in body' insertion mode
|
|
* logic for the generalized `self::step()` function.
|
|
*
|
|
* @access private
|
|
*
|
|
* @since 6.4.0
|
|
*
|
|
* @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input.
|
|
*
|
|
* @see https://html.spec.whatwg.org/#parsing-main-inbody
|
|
* @see self::step
|
|
*
|
|
* @return bool Whether an element was found.
|
|
*/
|
|
private function step_in_body() {
|
|
$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 "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->current_token );
|
|
$this->state->frameset_ok = false;
|
|
|
|
return true;
|
|
|
|
/*
|
|
* > 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 '+BLOCKQUOTE':
|
|
case '+DIV':
|
|
case '+FIGCAPTION':
|
|
case '+FIGURE':
|
|
case '+P':
|
|
if ( $this->state->stack_of_open_elements->has_p_in_button_scope() ) {
|
|
$this->close_a_p_element();
|
|
}
|
|
|
|
$this->insert_html_element( $this->current_token );
|
|
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 '-BLOCKQUOTE':
|
|
case '-BUTTON':
|
|
case '-DIV':
|
|
case '-FIGCAPTION':
|
|
case '-FIGURE':
|
|
if ( ! $this->state->stack_of_open_elements->has_element_in_scope( $tag_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()->node_name !== $tag_name ) {
|
|
// @TODO: Record parse error: this error doesn't impact parsing.
|
|
}
|
|
$this->state->stack_of_open_elements->pop_until( $tag_name );
|
|
return true;
|
|
|
|
/*
|
|
* > 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->current_token );
|
|
}
|
|
|
|
$this->close_a_p_element();
|
|
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;
|
|
|
|
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;
|
|
}
|
|
}
|
|
|
|
$this->reconstruct_active_formatting_elements();
|
|
$this->insert_html_element( $this->current_token );
|
|
$this->state->active_formatting_elements->push( $this->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->current_token );
|
|
$this->state->active_formatting_elements->push( $this->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 '-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: "area", "br", "embed", "img", "keygen", "wbr"
|
|
*/
|
|
case '+IMG':
|
|
$this->reconstruct_active_formatting_elements();
|
|
$this->insert_html_element( $this->current_token );
|
|
return true;
|
|
|
|
/*
|
|
* > Any other start tag
|
|
*/
|
|
case '+SPAN':
|
|
$this->reconstruct_active_formatting_elements();
|
|
$this->insert_html_element( $this->current_token );
|
|
return true;
|
|
|
|
/*
|
|
* Any other end tag
|
|
*/
|
|
case '-SPAN':
|
|
foreach ( $this->state->stack_of_open_elements->walk_up() as $item ) {
|
|
// > If node is an HTML element with the same tag name as the token, then:
|
|
if ( $item->node_name === $tag_name ) {
|
|
$this->generate_implied_end_tags( $tag_name );
|
|
|
|
// > If node is not the current node, then this is a parse error.
|
|
|
|
$this->state->stack_of_open_elements->pop_until( $tag_name );
|
|
return true;
|
|
}
|
|
|
|
// > Otherwise, if node is in the special category, then this is a parse error; ignore the token, and return.
|
|
if ( self::is_special( $item->node_name ) ) {
|
|
return $this->step();
|
|
}
|
|
}
|
|
// Execution should not reach here; if it does then something went wrong.
|
|
return false;
|
|
|
|
default:
|
|
$this->last_error = self::ERROR_UNSUPPORTED;
|
|
throw new WP_HTML_Unsupported_Exception( "Cannot process {$tag_name} element." );
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Internal helpers
|
|
*/
|
|
|
|
/**
|
|
* Creates a new bookmark for the currently-matched tag and returns generated name.
|
|
*
|
|
* @since 6.4.0
|
|
*
|
|
* @throws Exception When unable to allocate requested bookmark.
|
|
*
|
|
* @return string|false Name of created bookmark, or false if unable to create.
|
|
*/
|
|
private function bookmark_tag() {
|
|
if ( ! $this->get_tag() ) {
|
|
return false;
|
|
}
|
|
|
|
if ( ! parent::set_bookmark( ++$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
|
|
*/
|
|
|
|
/**
|
|
* Returns the uppercase name of the matched tag.
|
|
*
|
|
* Example:
|
|
*
|
|
* $p = new WP_HTML_Tag_Processor( '<div class="test">Test</div>' );
|
|
* $p->next_tag() === true;
|
|
* $p->get_tag() === 'DIV';
|
|
*
|
|
* $p->next_tag() === false;
|
|
* $p->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() {
|
|
if ( null !== $this->last_error ) {
|
|
return null;
|
|
}
|
|
|
|
$tag_name = parent::get_tag();
|
|
|
|
switch ( $tag_name ) {
|
|
case 'IMAGE':
|
|
/*
|
|
* > A start tag whose tag name is "image"
|
|
* > Change the token's tag name to "img" and reprocess it. (Don't ask.)
|
|
*/
|
|
return 'IMG';
|
|
|
|
default:
|
|
return $tag_name;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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( $bookmark_name ) {
|
|
return parent::release_bookmark( "_{$bookmark_name}" );
|
|
}
|
|
|
|
/**
|
|
* Moves the internal cursor in the Tag Processor to a given bookmark's location.
|
|
*
|
|
* In order to prevent accidental infinite loops, there's a
|
|
* maximum limit on the number of times seek() can be called.
|
|
*
|
|
* @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 ) {
|
|
$actual_bookmark_name = "_{$bookmark_name}";
|
|
$processor_started_at = $this->current_token ? $this->bookmarks[ $this->current_token->bookmark_name ]->start : 0;
|
|
$bookmark_starts_at = $this->bookmarks[ $actual_bookmark_name ]->start;
|
|
$direction = $bookmark_starts_at > $processor_started_at ? 'forward' : 'backward';
|
|
|
|
switch ( $direction ) {
|
|
case 'forward':
|
|
// When moving forwards, re-parse the document until reaching the same location as the original bookmark.
|
|
while ( $this->step() ) {
|
|
if ( $bookmark_starts_at === $this->bookmarks[ $this->current_token->bookmark_name ]->start ) {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
|
|
case 'backward':
|
|
/*
|
|
* When moving backwards, clear out all existing stack entries which appear after the destination
|
|
* bookmark. These could be stored for later retrieval, but doing so would require additional
|
|
* memory overhead and also demand that references and bookmarks are updated as the document
|
|
* changes. In time this could be a valuable optimization, but it's okay to give up that
|
|
* optimization in exchange for more CPU time to recompute the stack, to re-parse the
|
|
* document that may have already been parsed once.
|
|
*/
|
|
foreach ( $this->state->stack_of_open_elements->walk_up() as $item ) {
|
|
if ( $bookmark_starts_at >= $this->bookmarks[ $item->bookmark_name ]->start ) {
|
|
break;
|
|
}
|
|
|
|
$this->state->stack_of_open_elements->remove_node( $item );
|
|
}
|
|
|
|
foreach ( $this->state->active_formatting_elements->walk_up() as $item ) {
|
|
if ( $bookmark_starts_at >= $this->bookmarks[ $item->bookmark_name ]->start ) {
|
|
break;
|
|
}
|
|
|
|
$this->state->active_formatting_elements->remove_node( $item );
|
|
}
|
|
|
|
return parent::seek( $actual_bookmark_name );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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.
|
|
*
|
|
* @since 6.4.0
|
|
*
|
|
* @param string $bookmark_name Identifies this particular bookmark.
|
|
* @return bool Whether the bookmark was successfully created.
|
|
*/
|
|
public function set_bookmark( $bookmark_name ) {
|
|
return parent::set_bookmark( "_{$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() {
|
|
$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
|
|
*
|
|
* @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( $except_for_this_element = null ) {
|
|
$elements_with_implied_end_tags = array(
|
|
'P',
|
|
);
|
|
|
|
$current_node = $this->state->stack_of_open_elements->current_node();
|
|
while (
|
|
$current_node && $current_node->node_name !== $except_for_this_element &&
|
|
in_array( $this->state->stack_of_open_elements->current_node(), $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
|
|
*
|
|
* @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() {
|
|
$elements_with_implied_end_tags = array(
|
|
'P',
|
|
);
|
|
|
|
while ( in_array( $this->state->stack_of_open_elements->current_node(), $elements_with_implied_end_tags, true ) ) {
|
|
$this->state->stack_of_open_elements->pop();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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() {
|
|
/*
|
|
* > 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->last_error = self::ERROR_UNSUPPORTED;
|
|
throw new WP_HTML_Unsupported_Exception( 'Cannot reconstruct active formatting elements when advancing and rewinding is required.' );
|
|
}
|
|
|
|
/**
|
|
* 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() {
|
|
$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->last_error = self::ERROR_UNSUPPORTED;
|
|
throw new WP_HTML_Unsupported_Exception( '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->bookmark_name );
|
|
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->node_name ) ) {
|
|
$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->last_error = self::ERROR_UNSUPPORTED;
|
|
throw new WP_HTML_Unsupported_Exception( 'Cannot extract common ancestor in adoption agency algorithm.' );
|
|
}
|
|
|
|
$this->last_error = self::ERROR_UNSUPPORTED;
|
|
throw new WP_HTML_Unsupported_Exception( 'Cannot run adoption agency when looping required.' );
|
|
}
|
|
|
|
/**
|
|
* 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( $token ) {
|
|
$this->state->stack_of_open_elements->push( $token );
|
|
}
|
|
|
|
/*
|
|
* HTML Specification Helpers
|
|
*/
|
|
|
|
/**
|
|
* 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 string $tag_name Name of element to check.
|
|
* @return bool Whether the element of the given name is in the special category.
|
|
*/
|
|
public static function is_special( $tag_name ) {
|
|
$tag_name = strtoupper( $tag_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.
|
|
'MI' === $tag_name ||
|
|
'MO' === $tag_name ||
|
|
'MN' === $tag_name ||
|
|
'MS' === $tag_name ||
|
|
'MTEXT' === $tag_name ||
|
|
'ANNOTATION-XML' === $tag_name ||
|
|
|
|
// SVG.
|
|
'FOREIGNOBJECT' === $tag_name ||
|
|
'DESC' === $tag_name ||
|
|
'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 ) {
|
|
$tag_name = strtoupper( $tag_name );
|
|
|
|
return (
|
|
'AREA' === $tag_name ||
|
|
'BASE' === $tag_name ||
|
|
'BR' === $tag_name ||
|
|
'COL' === $tag_name ||
|
|
'EMBED' === $tag_name ||
|
|
'HR' === $tag_name ||
|
|
'IMG' === $tag_name ||
|
|
'INPUT' === $tag_name ||
|
|
'LINK' === $tag_name ||
|
|
'META' === $tag_name ||
|
|
'SOURCE' === $tag_name ||
|
|
'TRACK' === $tag_name ||
|
|
'WBR' === $tag_name
|
|
);
|
|
}
|
|
|
|
/*
|
|
* 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 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.
|
|
*/
|
|
const CONSTRUCTOR_UNLOCK_CODE = 'Use WP_HTML_Processor::createFragment instead of calling the class constructor directly.';
|
|
}
|