doesn't fully understand. * * The following list specifies the HTML tags that _are_ supported: * * - Containers: ADDRESS, BLOCKQUOTE, DETAILS, DIALOG, DIV, FOOTER, HEADER, MAIN, MENU, SPAN, SUMMARY. * - Custom elements: All custom elements are supported. :) * - Form elements: BUTTON, DATALIST, FIELDSET, INPUT, LABEL, LEGEND, METER, PROGRESS, SEARCH. * - Formatting elements: B, BIG, CODE, EM, FONT, I, PRE, SMALL, STRIKE, STRONG, TT, U, WBR. * - Heading elements: H1, H2, H3, H4, H5, H6, HGROUP. * - Links: A. * - Lists: DD, DL, DT, LI, OL, UL. * - Media elements: AUDIO, CANVAS, EMBED, FIGCAPTION, FIGURE, IMG, MAP, PICTURE, SOURCE, TRACK, VIDEO. * - Paragraph: BR, P. * - Phrasing elements: ABBR, AREA, BDI, BDO, CITE, DATA, DEL, DFN, INS, MARK, OUTPUT, Q, SAMP, SUB, SUP, TIME, VAR. * - Sectioning elements: ARTICLE, ASIDE, HR, NAV, SECTION. * - Templating elements: SLOT. * - Text decoration: RUBY. * - Deprecated elements: ACRONYM, BLINK, CENTER, DIR, ISINDEX, KEYGEN, LISTING, MULTICOL, NEXTID, PARAM, SPACER. * * ### 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. * - Some unbalanced or overlapping tags. * - P tags after unclosed P tags. * - BUTTON tags after unclosed BUTTON 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 { /** * 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 $state = null; /** * Used to create unique bookmark names. * * This class sets a bookmark for every tag in the HTML document that it encounters. * The bookmark name is auto-generated and increments, starting with `1`. These are * internal bookmarks and are automatically released when the referring WP_HTML_Token * goes out of scope and is garbage-collected. * * @since 6.4.0 * * @see WP_HTML_Processor::$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; /** * 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_on_destruct = 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 ``, 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 ``. * @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 create_fragment( $html, $context = '', $encoding = 'UTF-8' ) { if ( '' !== $context || 'UTF-8' !== $encoding ) { return null; } $processor = new self( $html, self::CONSTRUCTOR_UNLOCK_CODE ); $processor->state->context_node = array( 'BODY', array() ); $processor->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_BODY; // @todo Create "fake" bookmarks for non-existent but implied nodes. $processor->bookmarks['root-node'] = new WP_HTML_Span( 0, 0 ); $processor->bookmarks['context-node'] = new WP_HTML_Span( 0, 0 ); $processor->state->stack_of_open_elements->push( new WP_HTML_Token( 'root-node', 'HTML', false ) ); $processor->state->stack_of_open_elements->push( new WP_HTML_Token( 'context-node', $processor->state->context_node[0], false ) ); 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.' ), 'WP_HTML_Processor::create_fragment()' ), '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_on_destruct = 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 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( '