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1 <?php 2 /** 3 * HTML API: WP_HTML_Processor class 4 * 5 * @package WordPress 6 * @subpackage HTML-API 7 * @since 6.4.0 8 */ 9 10 /** 11 * Core class used to safely parse and modify an HTML document. 12 * 13 * The HTML Processor class properly parses and modifies HTML5 documents. 14 * 15 * It supports a subset of the HTML5 specification, and when it encounters 16 * unsupported markup, it aborts early to avoid unintentionally breaking 17 * the document. The HTML Processor should never break an HTML document. 18 * 19 * While the `WP_HTML_Tag_Processor` is a valuable tool for modifying 20 * attributes on individual HTML tags, the HTML Processor is more capable 21 * and useful for the following operations: 22 * 23 * - Querying based on nested HTML structure. 24 * 25 * Eventually the HTML Processor will also support: 26 * - Wrapping a tag in surrounding HTML. 27 * - Unwrapping a tag by removing its parent. 28 * - Inserting and removing nodes. 29 * - Reading and changing inner content. 30 * - Navigating up or around HTML structure. 31 * 32 * ## Usage 33 * 34 * Use of this class requires three steps: 35 * 36 * 1. Call a static creator method with your input HTML document. 37 * 2. Find the location in the document you are looking for. 38 * 3. Request changes to the document at that location. 39 * 40 * Example: 41 * 42 * $processor = WP_HTML_Processor::create_fragment( $html ); 43 * if ( $processor->next_tag( array( 'breadcrumbs' => array( 'DIV', 'FIGURE', 'IMG' ) ) ) ) { 44 * $processor->add_class( 'responsive-image' ); 45 * } 46 * 47 * #### Breadcrumbs 48 * 49 * Breadcrumbs represent the stack of open elements from the root 50 * of the document or fragment down to the currently-matched node, 51 * if one is currently selected. Call WP_HTML_Processor::get_breadcrumbs() 52 * to inspect the breadcrumbs for a matched tag. 53 * 54 * Breadcrumbs can specify nested HTML structure and are equivalent 55 * to a CSS selector comprising tag names separated by the child 56 * combinator, such as "DIV > FIGURE > IMG". 57 * 58 * Since all elements find themselves inside a full HTML document 59 * when parsed, the return value from `get_breadcrumbs()` will always 60 * contain any implicit outermost elements. For example, when parsing 61 * with `create_fragment()` in the `BODY` context (the default), any 62 * tag in the given HTML document will contain `array( 'HTML', 'BODY', … )` 63 * in its breadcrumbs. 64 * 65 * Despite containing the implied outermost elements in their breadcrumbs, 66 * tags may be found with the shortest-matching breadcrumb query. That is, 67 * `array( 'IMG' )` matches all IMG elements and `array( 'P', 'IMG' )` 68 * matches all IMG elements directly inside a P element. To ensure that no 69 * partial matches erroneously match it's possible to specify in a query 70 * the full breadcrumb match all the way down from the root HTML element. 71 * 72 * Example: 73 * 74 * $html = '<figure><img><figcaption>A <em>lovely</em> day outside</figcaption></figure>'; 75 * // ----- Matches here. 76 * $processor->next_tag( array( 'breadcrumbs' => array( 'FIGURE', 'IMG' ) ) ); 77 * 78 * $html = '<figure><img><figcaption>A <em>lovely</em> day outside</figcaption></figure>'; 79 * // ---- Matches here. 80 * $processor->next_tag( array( 'breadcrumbs' => array( 'FIGURE', 'FIGCAPTION', 'EM' ) ) ); 81 * 82 * $html = '<div><img></div><img>'; 83 * // ----- Matches here, because IMG must be a direct child of the implicit BODY. 84 * $processor->next_tag( array( 'breadcrumbs' => array( 'BODY', 'IMG' ) ) ); 85 * 86 * ## HTML Support 87 * 88 * This class implements a small part of the HTML5 specification. 89 * It's designed to operate within its support and abort early whenever 90 * encountering circumstances it can't properly handle. This is 91 * the principle way in which this class remains as simple as possible 92 * without cutting corners and breaking compliance. 93 * 94 * ### Supported elements 95 * 96 * If any unsupported element appears in the HTML input the HTML Processor 97 * will abort early and stop all processing. This draconian measure ensures 98 * that the HTML Processor won't break any HTML it doesn't fully understand. 99 * 100 * The HTML Processor supports all elements other than a specific set: 101 * 102 * - Any element inside a TABLE. 103 * - Any element inside foreign content, including SVG and MATH. 104 * - Any element outside the IN BODY insertion mode, e.g. doctype declarations, meta, links. 105 * 106 * ### Supported markup 107 * 108 * Some kinds of non-normative HTML involve reconstruction of formatting elements and 109 * re-parenting of mis-nested elements. For example, a DIV tag found inside a TABLE 110 * may in fact belong _before_ the table in the DOM. If the HTML Processor encounters 111 * such a case it will stop processing. 112 * 113 * The following list illustrates some common examples of unexpected HTML inputs that 114 * the HTML Processor properly parses and represents: 115 * 116 * - HTML with optional tags omitted, e.g. `<p>one<p>two`. 117 * - HTML with unexpected tag closers, e.g. `<p>one </span> more</p>`. 118 * - Non-void tags with self-closing flag, e.g. `<div/>the DIV is still open.</div>`. 119 * - Heading elements which close open heading elements of another level, e.g. `<h1>Closed by </h2>`. 120 * - Elements containing text that looks like other tags but isn't, e.g. `<title>The <img> is plaintext</title>`. 121 * - SCRIPT and STYLE tags containing text that looks like HTML but isn't, e.g. `<script>document.write('<p>Hi</p>');</script>`. 122 * - SCRIPT content which has been escaped, e.g. `<script><!-- document.write('<script>console.log("hi")</script>') --></script>`. 123 * 124 * ### Unsupported Features 125 * 126 * This parser does not report parse errors. 127 * 128 * Normally, when additional HTML or BODY tags are encountered in a document, if there 129 * are any additional attributes on them that aren't found on the previous elements, 130 * the existing HTML and BODY elements adopt those missing attribute values. This 131 * parser does not add those additional attributes. 132 * 133 * In certain situations, elements are moved to a different part of the document in 134 * a process called "adoption" and "fostering." Because the nodes move to a location 135 * in the document that the parser had already processed, this parser does not support 136 * these situations and will bail. 137 * 138 * @since 6.4.0 139 * 140 * @see WP_HTML_Tag_Processor 141 * @see https://html.spec.whatwg.org/ 142 */ 143 class WP_HTML_Processor extends WP_HTML_Tag_Processor { 144 /** 145 * The maximum number of bookmarks allowed to exist at any given time. 146 * 147 * HTML processing requires more bookmarks than basic tag processing, 148 * so this class constant from the Tag Processor is overwritten. 149 * 150 * @since 6.4.0 151 * 152 * @var int 153 */ 154 const MAX_BOOKMARKS = 100; 155 156 /** 157 * Holds the working state of the parser, including the stack of 158 * open elements and the stack of active formatting elements. 159 * 160 * Initialized in the constructor. 161 * 162 * @since 6.4.0 163 * 164 * @var WP_HTML_Processor_State 165 */ 166 private $state; 167 168 /** 169 * Used to create unique bookmark names. 170 * 171 * This class sets a bookmark for every tag in the HTML document that it encounters. 172 * The bookmark name is auto-generated and increments, starting with `1`. These are 173 * internal bookmarks and are automatically released when the referring WP_HTML_Token 174 * goes out of scope and is garbage-collected. 175 * 176 * @since 6.4.0 177 * 178 * @see WP_HTML_Processor::$release_internal_bookmark_on_destruct 179 * 180 * @var int 181 */ 182 private $bookmark_counter = 0; 183 184 /** 185 * Stores an explanation for why something failed, if it did. 186 * 187 * @see self::get_last_error 188 * 189 * @since 6.4.0 190 * 191 * @var string|null 192 */ 193 private $last_error = null; 194 195 /** 196 * Stores context for why the parser bailed on unsupported HTML, if it did. 197 * 198 * @see self::get_unsupported_exception 199 * 200 * @since 6.7.0 201 * 202 * @var WP_HTML_Unsupported_Exception|null 203 */ 204 private $unsupported_exception = null; 205 206 /** 207 * Releases a bookmark when PHP garbage-collects its wrapping WP_HTML_Token instance. 208 * 209 * This function is created inside the class constructor so that it can be passed to 210 * the stack of open elements and the stack of active formatting elements without 211 * exposing it as a public method on the class. 212 * 213 * @since 6.4.0 214 * 215 * @var Closure|null 216 */ 217 private $release_internal_bookmark_on_destruct = null; 218 219 /** 220 * Stores stack events which arise during parsing of the 221 * HTML document, which will then supply the "match" events. 222 * 223 * @since 6.6.0 224 * 225 * @var WP_HTML_Stack_Event[] 226 */ 227 private $element_queue = array(); 228 229 /** 230 * Stores the current breadcrumbs. 231 * 232 * @since 6.7.0 233 * 234 * @var string[] 235 */ 236 private $breadcrumbs = array(); 237 238 /** 239 * Current stack event, if set, representing a matched token. 240 * 241 * Because the parser may internally point to a place further along in a document 242 * than the nodes which have already been processed (some "virtual" nodes may have 243 * appeared while scanning the HTML document), this will point at the "current" node 244 * being processed. It comes from the front of the element queue. 245 * 246 * @since 6.6.0 247 * 248 * @var WP_HTML_Stack_Event|null 249 */ 250 private $current_element = null; 251 252 /** 253 * Context node if created as a fragment parser. 254 * 255 * @var WP_HTML_Token|null 256 */ 257 private $context_node = null; 258 259 /* 260 * Public Interface Functions 261 */ 262 263 /** 264 * Creates an HTML processor in the fragment parsing mode. 265 * 266 * Use this for cases where you are processing chunks of HTML that 267 * will be found within a bigger HTML document, such as rendered 268 * block output that exists within a post, `the_content` inside a 269 * rendered site layout. 270 * 271 * Fragment parsing occurs within a context, which is an HTML element 272 * that the document will eventually be placed in. It becomes important 273 * when special elements have different rules than others, such as inside 274 * a TEXTAREA or a TITLE tag where things that look like tags are text, 275 * or inside a SCRIPT tag where things that look like HTML syntax are JS. 276 * 277 * The context value should be a representation of the tag into which the 278 * HTML is found. For most cases this will be the body element. The HTML 279 * form is provided because a context element may have attributes that 280 * impact the parse, such as with a SCRIPT tag and its `type` attribute. 281 * 282 * ## Current HTML Support 283 * 284 * - The only supported context is `<body>`, which is the default value. 285 * - The only supported document encoding is `UTF-8`, which is the default value. 286 * 287 * @since 6.4.0 288 * @since 6.6.0 Returns `static` instead of `self` so it can create subclass instances. 289 * 290 * @param string $html Input HTML fragment to process. 291 * @param string $context Context element for the fragment, must be default of `<body>`. 292 * @param string $encoding Text encoding of the document; must be default of 'UTF-8'. 293 * @return static|null The created processor if successful, otherwise null. 294 */ 295 public static function create_fragment( $html, $context = '<body>', $encoding = 'UTF-8' ) { 296 if ( '<body>' !== $context || 'UTF-8' !== $encoding ) { 297 return null; 298 } 299 300 $context_processor = static::create_full_parser( "<!DOCTYPE html>{$context}", $encoding ); 301 if ( null === $context_processor ) { 302 return null; 303 } 304 305 while ( $context_processor->next_tag() ) { 306 if ( ! $context_processor->is_virtual() ) { 307 $context_processor->set_bookmark( 'final_node' ); 308 } 309 } 310 311 if ( 312 ! $context_processor->has_bookmark( 'final_node' ) || 313 ! $context_processor->seek( 'final_node' ) 314 ) { 315 _doing_it_wrong( __METHOD__, __( 'No valid context element was detected.' ), '6.8.0' ); 316 return null; 317 } 318 319 return $context_processor->create_fragment_at_current_node( $html ); 320 } 321 322 /** 323 * Creates an HTML processor in the full parsing mode. 324 * 325 * It's likely that a fragment parser is more appropriate, unless sending an 326 * entire HTML document from start to finish. Consider a fragment parser with 327 * a context node of `<body>`. 328 * 329 * UTF-8 is the only allowed encoding. If working with a document that 330 * isn't UTF-8, first convert the document to UTF-8, then pass in the 331 * converted HTML. 332 * 333 * @param string $html Input HTML document to process. 334 * @param string|null $known_definite_encoding Optional. If provided, specifies the charset used 335 * in the input byte stream. Currently must be UTF-8. 336 * @return static|null The created processor if successful, otherwise null. 337 */ 338 public static function create_full_parser( $html, $known_definite_encoding = 'UTF-8' ) { 339 if ( 'UTF-8' !== $known_definite_encoding ) { 340 return null; 341 } 342 343 $processor = new static( $html, self::CONSTRUCTOR_UNLOCK_CODE ); 344 $processor->state->encoding = $known_definite_encoding; 345 $processor->state->encoding_confidence = 'certain'; 346 347 return $processor; 348 } 349 350 /** 351 * Constructor. 352 * 353 * Do not use this method. Use the static creator methods instead. 354 * 355 * @access private 356 * 357 * @since 6.4.0 358 * 359 * @see WP_HTML_Processor::create_fragment() 360 * 361 * @param string $html HTML to process. 362 * @param string|null $use_the_static_create_methods_instead This constructor should not be called manually. 363 */ 364 public function __construct( $html, $use_the_static_create_methods_instead = null ) { 365 parent::__construct( $html ); 366 367 if ( self::CONSTRUCTOR_UNLOCK_CODE !== $use_the_static_create_methods_instead ) { 368 _doing_it_wrong( 369 __METHOD__, 370 sprintf( 371 /* translators: %s: WP_HTML_Processor::create_fragment(). */ 372 __( 'Call %s to create an HTML Processor instead of calling the constructor directly.' ), 373 '<code>WP_HTML_Processor::create_fragment()</code>' 374 ), 375 '6.4.0' 376 ); 377 } 378 379 $this->state = new WP_HTML_Processor_State(); 380 381 $this->state->stack_of_open_elements->set_push_handler( 382 function ( WP_HTML_Token $token ): void { 383 $is_virtual = ! isset( $this->state->current_token ) || $this->is_tag_closer(); 384 $same_node = isset( $this->state->current_token ) && $token->node_name === $this->state->current_token->node_name; 385 $provenance = ( ! $same_node || $is_virtual ) ? 'virtual' : 'real'; 386 $this->element_queue[] = new WP_HTML_Stack_Event( $token, WP_HTML_Stack_Event::PUSH, $provenance ); 387 388 $this->change_parsing_namespace( $token->integration_node_type ? 'html' : $token->namespace ); 389 } 390 ); 391 392 $this->state->stack_of_open_elements->set_pop_handler( 393 function ( WP_HTML_Token $token ): void { 394 $is_virtual = ! isset( $this->state->current_token ) || ! $this->is_tag_closer(); 395 $same_node = isset( $this->state->current_token ) && $token->node_name === $this->state->current_token->node_name; 396 $provenance = ( ! $same_node || $is_virtual ) ? 'virtual' : 'real'; 397 $this->element_queue[] = new WP_HTML_Stack_Event( $token, WP_HTML_Stack_Event::POP, $provenance ); 398 399 $adjusted_current_node = $this->get_adjusted_current_node(); 400 401 if ( $adjusted_current_node ) { 402 $this->change_parsing_namespace( $adjusted_current_node->integration_node_type ? 'html' : $adjusted_current_node->namespace ); 403 } else { 404 $this->change_parsing_namespace( 'html' ); 405 } 406 } 407 ); 408 409 /* 410 * Create this wrapper so that it's possible to pass 411 * a private method into WP_HTML_Token classes without 412 * exposing it to any public API. 413 */ 414 $this->release_internal_bookmark_on_destruct = function ( string $name ): void { 415 parent::release_bookmark( $name ); 416 }; 417 } 418 419 /** 420 * Creates a fragment processor at the current node. 421 * 422 * HTML Fragment parsing always happens with a context node. HTML Fragment Processors can be 423 * instantiated with a `BODY` context node via `WP_HTML_Processor::create_fragment( $html )`. 424 * 425 * The context node may impact how a fragment of HTML is parsed. For example, consider the HTML 426 * fragment `<td />Inside TD?</td>`. 427 * 428 * A BODY context node will produce the following tree: 429 * 430 * └─#text Inside TD? 431 * 432 * Notice that the `<td>` tags are completely ignored. 433 * 434 * Compare that with an SVG context node that produces the following tree: 435 * 436 * ├─svg:td 437 * └─#text Inside TD? 438 * 439 * Here, a `td` node in the `svg` namespace is created, and its self-closing flag is respected. 440 * This is a peculiarity of parsing HTML in foreign content like SVG. 441 * 442 * Finally, consider the tree produced with a TABLE context node: 443 * 444 * └─TBODY 445 * └─TR 446 * └─TD 447 * └─#text Inside TD? 448 * 449 * These examples demonstrate how important the context node may be when processing an HTML 450 * fragment. Special care must be taken when processing fragments that are expected to appear 451 * in specific contexts. SVG and TABLE are good examples, but there are others. 452 * 453 * @see https://html.spec.whatwg.org/multipage/parsing.html#html-fragment-parsing-algorithm 454 * 455 * @since 6.8.0 456 * 457 * @param string $html Input HTML fragment to process. 458 * @return static|null The created processor if successful, otherwise null. 459 */ 460 private function create_fragment_at_current_node( string $html ) { 461 if ( $this->get_token_type() !== '#tag' || $this->is_tag_closer() ) { 462 _doing_it_wrong( 463 __METHOD__, 464 __( 'The context element must be a start tag.' ), 465 '6.8.0' 466 ); 467 return null; 468 } 469 470 $tag_name = $this->current_element->token->node_name; 471 $namespace = $this->current_element->token->namespace; 472 473 if ( 'html' === $namespace && self::is_void( $tag_name ) ) { 474 _doing_it_wrong( 475 __METHOD__, 476 sprintf( 477 // translators: %s: A tag name like INPUT or BR. 478 __( 'The context element cannot be a void element, found "%s".' ), 479 $tag_name 480 ), 481 '6.8.0' 482 ); 483 return null; 484 } 485 486 /* 487 * Prevent creating fragments at nodes that require a special tokenizer state. 488 * This is unsupported by the HTML Processor. 489 */ 490 if ( 491 'html' === $namespace && 492 in_array( $tag_name, array( 'IFRAME', 'NOEMBED', 'NOFRAMES', 'SCRIPT', 'STYLE', 'TEXTAREA', 'TITLE', 'XMP', 'PLAINTEXT' ), true ) 493 ) { 494 _doing_it_wrong( 495 __METHOD__, 496 sprintf( 497 // translators: %s: A tag name like IFRAME or TEXTAREA. 498 __( 'The context element "%s" is not supported.' ), 499 $tag_name 500 ), 501 '6.8.0' 502 ); 503 return null; 504 } 505 506 $fragment_processor = new static( $html, self::CONSTRUCTOR_UNLOCK_CODE ); 507 508 $fragment_processor->compat_mode = $this->compat_mode; 509 510 // @todo Create "fake" bookmarks for non-existent but implied nodes. 511 $fragment_processor->bookmarks['root-node'] = new WP_HTML_Span( 0, 0 ); 512 $root_node = new WP_HTML_Token( 513 'root-node', 514 'HTML', 515 false 516 ); 517 $fragment_processor->state->stack_of_open_elements->push( $root_node ); 518 519 $fragment_processor->bookmarks['context-node'] = new WP_HTML_Span( 0, 0 ); 520 $fragment_processor->context_node = clone $this->current_element->token; 521 $fragment_processor->context_node->bookmark_name = 'context-node'; 522 $fragment_processor->context_node->on_destroy = null; 523 524 $fragment_processor->breadcrumbs = array( 'HTML', $fragment_processor->context_node->node_name ); 525 526 if ( 'TEMPLATE' === $fragment_processor->context_node->node_name ) { 527 $fragment_processor->state->stack_of_template_insertion_modes[] = WP_HTML_Processor_State::INSERTION_MODE_IN_TEMPLATE; 528 } 529 530 $fragment_processor->reset_insertion_mode_appropriately(); 531 532 /* 533 * > Set the parser's form element pointer to the nearest node to the context element that 534 * > is a form element (going straight up the ancestor chain, and including the element 535 * > itself, if it is a form element), if any. (If there is no such form element, the 536 * > form element pointer keeps its initial value, null.) 537 */ 538 foreach ( $this->state->stack_of_open_elements->walk_up() as $element ) { 539 if ( 'FORM' === $element->node_name && 'html' === $element->namespace ) { 540 $fragment_processor->state->form_element = clone $element; 541 $fragment_processor->state->form_element->bookmark_name = null; 542 $fragment_processor->state->form_element->on_destroy = null; 543 break; 544 } 545 } 546 547 $fragment_processor->state->encoding_confidence = 'irrelevant'; 548 549 /* 550 * Update the parsing namespace near the end of the process. 551 * This is important so that any push/pop from the stack of open 552 * elements does not change the parsing namespace. 553 */ 554 $fragment_processor->change_parsing_namespace( 555 $this->current_element->token->integration_node_type ? 'html' : $namespace 556 ); 557 558 return $fragment_processor; 559 } 560 561 /** 562 * Stops the parser and terminates its execution when encountering unsupported markup. 563 * 564 * @throws WP_HTML_Unsupported_Exception Halts execution of the parser. 565 * 566 * @since 6.7.0 567 * 568 * @param string $message Explains support is missing in order to parse the current node. 569 */ 570 private function bail( string $message ) { 571 $here = $this->bookmarks[ $this->state->current_token->bookmark_name ]; 572 $token = substr( $this->html, $here->start, $here->length ); 573 574 $open_elements = array(); 575 foreach ( $this->state->stack_of_open_elements->stack as $item ) { 576 $open_elements[] = $item->node_name; 577 } 578 579 $active_formats = array(); 580 foreach ( $this->state->active_formatting_elements->walk_down() as $item ) { 581 $active_formats[] = $item->node_name; 582 } 583 584 $this->last_error = self::ERROR_UNSUPPORTED; 585 586 $this->unsupported_exception = new WP_HTML_Unsupported_Exception( 587 $message, 588 $this->state->current_token->node_name, 589 $here->start, 590 $token, 591 $open_elements, 592 $active_formats 593 ); 594 595 throw $this->unsupported_exception; 596 } 597 598 /** 599 * Returns the last error, if any. 600 * 601 * Various situations lead to parsing failure but this class will 602 * return `false` in all those cases. To determine why something 603 * failed it's possible to request the last error. This can be 604 * helpful to know to distinguish whether a given tag couldn't 605 * be found or if content in the document caused the processor 606 * to give up and abort processing. 607 * 608 * Example 609 * 610 * $processor = WP_HTML_Processor::create_fragment( '<template><strong><button><em><p><em>' ); 611 * false === $processor->next_tag(); 612 * WP_HTML_Processor::ERROR_UNSUPPORTED === $processor->get_last_error(); 613 * 614 * @since 6.4.0 615 * 616 * @see self::ERROR_UNSUPPORTED 617 * @see self::ERROR_EXCEEDED_MAX_BOOKMARKS 618 * 619 * @return string|null The last error, if one exists, otherwise null. 620 */ 621 public function get_last_error(): ?string { 622 return $this->last_error; 623 } 624 625 /** 626 * Returns context for why the parser aborted due to unsupported HTML, if it did. 627 * 628 * This is meant for debugging purposes, not for production use. 629 * 630 * @since 6.7.0 631 * 632 * @see self::$unsupported_exception 633 * 634 * @return WP_HTML_Unsupported_Exception|null 635 */ 636 public function get_unsupported_exception() { 637 return $this->unsupported_exception; 638 } 639 640 /** 641 * Finds the next tag matching the $query. 642 * 643 * @todo Support matching the class name and tag name. 644 * 645 * @since 6.4.0 646 * @since 6.6.0 Visits all tokens, including virtual ones. 647 * 648 * @throws Exception When unable to allocate a bookmark for the next token in the input HTML document. 649 * 650 * @param array|string|null $query { 651 * Optional. Which tag name to find, having which class, etc. Default is to find any tag. 652 * 653 * @type string|null $tag_name Which tag to find, or `null` for "any tag." 654 * @type string $tag_closers 'visit' to pause at tag closers, 'skip' or unset to only visit openers. 655 * @type int|null $match_offset Find the Nth tag matching all search criteria. 656 * 1 for "first" tag, 3 for "third," etc. 657 * Defaults to first tag. 658 * @type string|null $class_name Tag must contain this whole class name to match. 659 * @type string[] $breadcrumbs DOM sub-path at which element is found, e.g. `array( 'FIGURE', 'IMG' )`. 660 * May also contain the wildcard `*` which matches a single element, e.g. `array( 'SECTION', '*' )`. 661 * } 662 * @return bool Whether a tag was matched. 663 */ 664 public function next_tag( $query = null ): bool { 665 $visit_closers = isset( $query['tag_closers'] ) && 'visit' === $query['tag_closers']; 666 667 if ( null === $query ) { 668 while ( $this->next_token() ) { 669 if ( '#tag' !== $this->get_token_type() ) { 670 continue; 671 } 672 673 if ( ! $this->is_tag_closer() || $visit_closers ) { 674 return true; 675 } 676 } 677 678 return false; 679 } 680 681 if ( is_string( $query ) ) { 682 $query = array( 'breadcrumbs' => array( $query ) ); 683 } 684 685 if ( ! is_array( $query ) ) { 686 _doing_it_wrong( 687 __METHOD__, 688 __( 'Please pass a query array to this function.' ), 689 '6.4.0' 690 ); 691 return false; 692 } 693 694 if ( isset( $query['tag_name'] ) ) { 695 $query['tag_name'] = strtoupper( $query['tag_name'] ); 696 } 697 698 $needs_class = ( isset( $query['class_name'] ) && is_string( $query['class_name'] ) ) 699 ? $query['class_name'] 700 : null; 701 702 if ( ! ( array_key_exists( 'breadcrumbs', $query ) && is_array( $query['breadcrumbs'] ) ) ) { 703 while ( $this->next_token() ) { 704 if ( '#tag' !== $this->get_token_type() ) { 705 continue; 706 } 707 708 if ( isset( $query['tag_name'] ) && $query['tag_name'] !== $this->get_token_name() ) { 709 continue; 710 } 711 712 if ( isset( $needs_class ) && ! $this->has_class( $needs_class ) ) { 713 continue; 714 } 715 716 if ( ! $this->is_tag_closer() || $visit_closers ) { 717 return true; 718 } 719 } 720 721 return false; 722 } 723 724 $breadcrumbs = $query['breadcrumbs']; 725 $match_offset = isset( $query['match_offset'] ) ? (int) $query['match_offset'] : 1; 726 727 while ( $match_offset > 0 && $this->next_token() ) { 728 if ( '#tag' !== $this->get_token_type() || $this->is_tag_closer() ) { 729 continue; 730 } 731 732 if ( isset( $needs_class ) && ! $this->has_class( $needs_class ) ) { 733 continue; 734 } 735 736 if ( $this->matches_breadcrumbs( $breadcrumbs ) && 0 === --$match_offset ) { 737 return true; 738 } 739 } 740 741 return false; 742 } 743 744 /** 745 * Finds the next token in the HTML document. 746 * 747 * This doesn't currently have a way to represent non-tags and doesn't process 748 * semantic rules for text nodes. For access to the raw tokens consider using 749 * WP_HTML_Tag_Processor instead. 750 * 751 * @since 6.5.0 Added for internal support; do not use. 752 * @since 6.7.1 Refactored so subclasses may extend. 753 * 754 * @return bool Whether a token was parsed. 755 */ 756 public function next_token(): bool { 757 return $this->next_visitable_token(); 758 } 759 760 /** 761 * Ensures internal accounting is maintained for HTML semantic rules while 762 * the underlying Tag Processor class is seeking to a bookmark. 763 * 764 * This doesn't currently have a way to represent non-tags and doesn't process 765 * semantic rules for text nodes. For access to the raw tokens consider using 766 * WP_HTML_Tag_Processor instead. 767 * 768 * Note that this method may call itself recursively. This is why it is not 769 * implemented as {@see WP_HTML_Processor::next_token()}, which instead calls 770 * this method similarly to how {@see WP_HTML_Tag_Processor::next_token()} 771 * calls the {@see WP_HTML_Tag_Processor::base_class_next_token()} method. 772 * 773 * @since 6.7.1 Added for internal support. 774 * 775 * @access private 776 * 777 * @return bool 778 */ 779 private function next_visitable_token(): bool { 780 $this->current_element = null; 781 782 if ( isset( $this->last_error ) ) { 783 return false; 784 } 785 786 /* 787 * Prime the events if there are none. 788 * 789 * @todo In some cases, probably related to the adoption agency 790 * algorithm, this call to step() doesn't create any new 791 * events. Calling it again creates them. Figure out why 792 * this is and if it's inherent or if it's a bug. Looping 793 * until there are events or until there are no more 794 * tokens works in the meantime and isn't obviously wrong. 795 */ 796 if ( empty( $this->element_queue ) && $this->step() ) { 797 return $this->next_visitable_token(); 798 } 799 800 // Process the next event on the queue. 801 $this->current_element = array_shift( $this->element_queue ); 802 if ( ! isset( $this->current_element ) ) { 803 // There are no tokens left, so close all remaining open elements. 804 while ( $this->state->stack_of_open_elements->pop() ) { 805 continue; 806 } 807 808 return empty( $this->element_queue ) ? false : $this->next_visitable_token(); 809 } 810 811 $is_pop = WP_HTML_Stack_Event::POP === $this->current_element->operation; 812 813 /* 814 * The root node only exists in the fragment parser, and closing it 815 * indicates that the parse is complete. Stop before popping it from 816 * the breadcrumbs. 817 */ 818 if ( 'root-node' === $this->current_element->token->bookmark_name ) { 819 return $this->next_visitable_token(); 820 } 821 822 // Adjust the breadcrumbs for this event. 823 if ( $is_pop ) { 824 array_pop( $this->breadcrumbs ); 825 } else { 826 $this->breadcrumbs[] = $this->current_element->token->node_name; 827 } 828 829 // Avoid sending close events for elements which don't expect a closing. 830 if ( $is_pop && ! $this->expects_closer( $this->current_element->token ) ) { 831 return $this->next_visitable_token(); 832 } 833 834 return true; 835 } 836 837 /** 838 * Indicates if the current tag token is a tag closer. 839 * 840 * Example: 841 * 842 * $p = WP_HTML_Processor::create_fragment( '<div></div>' ); 843 * $p->next_tag( array( 'tag_name' => 'div', 'tag_closers' => 'visit' ) ); 844 * $p->is_tag_closer() === false; 845 * 846 * $p->next_tag( array( 'tag_name' => 'div', 'tag_closers' => 'visit' ) ); 847 * $p->is_tag_closer() === true; 848 * 849 * @since 6.6.0 Subclassed for HTML Processor. 850 * 851 * @return bool Whether the current tag is a tag closer. 852 */ 853 public function is_tag_closer(): bool { 854 return $this->is_virtual() 855 ? ( WP_HTML_Stack_Event::POP === $this->current_element->operation && '#tag' === $this->get_token_type() ) 856 : parent::is_tag_closer(); 857 } 858 859 /** 860 * Indicates if the currently-matched token is virtual, created by a stack operation 861 * while processing HTML, rather than a token found in the HTML text itself. 862 * 863 * @since 6.6.0 864 * 865 * @return bool Whether the current token is virtual. 866 */ 867 private function is_virtual(): bool { 868 return ( 869 isset( $this->current_element->provenance ) && 870 'virtual' === $this->current_element->provenance 871 ); 872 } 873 874 /** 875 * Indicates if the currently-matched tag matches the given breadcrumbs. 876 * 877 * A "*" represents a single tag wildcard, where any tag matches, but not no tags. 878 * 879 * At some point this function _may_ support a `**` syntax for matching any number 880 * of unspecified tags in the breadcrumb stack. This has been intentionally left 881 * out, however, to keep this function simple and to avoid introducing backtracking, 882 * which could open up surprising performance breakdowns. 883 * 884 * Example: 885 * 886 * $processor = WP_HTML_Processor::create_fragment( '<div><span><figure><img></figure></span></div>' ); 887 * $processor->next_tag( 'img' ); 888 * true === $processor->matches_breadcrumbs( array( 'figure', 'img' ) ); 889 * true === $processor->matches_breadcrumbs( array( 'span', 'figure', 'img' ) ); 890 * false === $processor->matches_breadcrumbs( array( 'span', 'img' ) ); 891 * true === $processor->matches_breadcrumbs( array( 'span', '*', 'img' ) ); 892 * 893 * @since 6.4.0 894 * 895 * @param string[] $breadcrumbs DOM sub-path at which element is found, e.g. `array( 'FIGURE', 'IMG' )`. 896 * May also contain the wildcard `*` which matches a single element, e.g. `array( 'SECTION', '*' )`. 897 * @return bool Whether the currently-matched tag is found at the given nested structure. 898 */ 899 public function matches_breadcrumbs( $breadcrumbs ): bool { 900 // Everything matches when there are zero constraints. 901 if ( 0 === count( $breadcrumbs ) ) { 902 return true; 903 } 904 905 // Start at the last crumb. 906 $crumb = end( $breadcrumbs ); 907 908 if ( '*' !== $crumb && $this->get_tag() !== strtoupper( $crumb ) ) { 909 return false; 910 } 911 912 for ( $i = count( $this->breadcrumbs ) - 1; $i >= 0; $i-- ) { 913 $node = $this->breadcrumbs[ $i ]; 914 $crumb = strtoupper( current( $breadcrumbs ) ); 915 916 if ( '*' !== $crumb && $node !== $crumb ) { 917 return false; 918 } 919 920 if ( false === prev( $breadcrumbs ) ) { 921 return true; 922 } 923 } 924 925 return false; 926 } 927 928 /** 929 * Indicates if the currently-matched node expects a closing 930 * token, or if it will self-close on the next step. 931 * 932 * Most HTML elements expect a closer, such as a P element or 933 * a DIV element. Others, like an IMG element are void and don't 934 * have a closing tag. Special elements, such as SCRIPT and STYLE, 935 * are treated just like void tags. Text nodes and self-closing 936 * foreign content will also act just like a void tag, immediately 937 * closing as soon as the processor advances to the next token. 938 * 939 * @since 6.6.0 940 * 941 * @param WP_HTML_Token|null $node Optional. Node to examine, if provided. 942 * Default is to examine current node. 943 * @return bool|null Whether to expect a closer for the currently-matched node, 944 * or `null` if not matched on any token. 945 */ 946 public function expects_closer( ?WP_HTML_Token $node = null ): ?bool { 947 $token_name = $node->node_name ?? $this->get_token_name(); 948 949 if ( ! isset( $token_name ) ) { 950 return null; 951 } 952 953 $token_namespace = $node->namespace ?? $this->get_namespace(); 954 $token_has_self_closing = $node->has_self_closing_flag ?? $this->has_self_closing_flag(); 955 956 return ! ( 957 // Comments, text nodes, and other atomic tokens. 958 '#' === $token_name[0] || 959 // Doctype declarations. 960 'html' === $token_name || 961 // Void elements. 962 ( 'html' === $token_namespace && self::is_void( $token_name ) ) || 963 // Special atomic elements. 964 ( 'html' === $token_namespace && in_array( $token_name, array( 'IFRAME', 'NOEMBED', 'NOFRAMES', 'SCRIPT', 'STYLE', 'TEXTAREA', 'TITLE', 'XMP' ), true ) ) || 965 // Self-closing elements in foreign content. 966 ( 'html' !== $token_namespace && $token_has_self_closing ) 967 ); 968 } 969 970 /** 971 * Steps through the HTML document and stop at the next tag, if any. 972 * 973 * @since 6.4.0 974 * 975 * @throws Exception When unable to allocate a bookmark for the next token in the input HTML document. 976 * 977 * @see self::PROCESS_NEXT_NODE 978 * @see self::REPROCESS_CURRENT_NODE 979 * 980 * @param string $node_to_process Whether to parse the next node or reprocess the current node. 981 * @return bool Whether a tag was matched. 982 */ 983 public function step( $node_to_process = self::PROCESS_NEXT_NODE ): bool { 984 // Refuse to proceed if there was a previous error. 985 if ( null !== $this->last_error ) { 986 return false; 987 } 988 989 if ( self::REPROCESS_CURRENT_NODE !== $node_to_process ) { 990 /* 991 * Void elements still hop onto the stack of open elements even though 992 * there's no corresponding closing tag. This is important for managing 993 * stack-based operations such as "navigate to parent node" or checking 994 * on an element's breadcrumbs. 995 * 996 * When moving on to the next node, therefore, if the bottom-most element 997 * on the stack is a void element, it must be closed. 998 */ 999 $top_node = $this->state->stack_of_open_elements->current_node(); 1000 if ( isset( $top_node ) && ! $this->expects_closer( $top_node ) ) { 1001 $this->state->stack_of_open_elements->pop(); 1002 } 1003 } 1004 1005 if ( self::PROCESS_NEXT_NODE === $node_to_process ) { 1006 parent::next_token(); 1007 if ( WP_HTML_Tag_Processor::STATE_TEXT_NODE === $this->parser_state ) { 1008 parent::subdivide_text_appropriately(); 1009 } 1010 } 1011 1012 // Finish stepping when there are no more tokens in the document. 1013 if ( 1014 WP_HTML_Tag_Processor::STATE_INCOMPLETE_INPUT === $this->parser_state || 1015 WP_HTML_Tag_Processor::STATE_COMPLETE === $this->parser_state 1016 ) { 1017 return false; 1018 } 1019 1020 $adjusted_current_node = $this->get_adjusted_current_node(); 1021 $is_closer = $this->is_tag_closer(); 1022 $is_start_tag = WP_HTML_Tag_Processor::STATE_MATCHED_TAG === $this->parser_state && ! $is_closer; 1023 $token_name = $this->get_token_name(); 1024 1025 if ( self::REPROCESS_CURRENT_NODE !== $node_to_process ) { 1026 $this->state->current_token = new WP_HTML_Token( 1027 $this->bookmark_token(), 1028 $token_name, 1029 $this->has_self_closing_flag(), 1030 $this->release_internal_bookmark_on_destruct 1031 ); 1032 } 1033 1034 $parse_in_current_insertion_mode = ( 1035 0 === $this->state->stack_of_open_elements->count() || 1036 'html' === $adjusted_current_node->namespace || 1037 ( 1038 'math' === $adjusted_current_node->integration_node_type && 1039 ( 1040 ( $is_start_tag && ! in_array( $token_name, array( 'MGLYPH', 'MALIGNMARK' ), true ) ) || 1041 '#text' === $token_name 1042 ) 1043 ) || 1044 ( 1045 'math' === $adjusted_current_node->namespace && 1046 'ANNOTATION-XML' === $adjusted_current_node->node_name && 1047 $is_start_tag && 'SVG' === $token_name 1048 ) || 1049 ( 1050 'html' === $adjusted_current_node->integration_node_type && 1051 ( $is_start_tag || '#text' === $token_name ) 1052 ) 1053 ); 1054 1055 try { 1056 if ( ! $parse_in_current_insertion_mode ) { 1057 return $this->step_in_foreign_content(); 1058 } 1059 1060 switch ( $this->state->insertion_mode ) { 1061 case WP_HTML_Processor_State::INSERTION_MODE_INITIAL: 1062 return $this->step_initial(); 1063 1064 case WP_HTML_Processor_State::INSERTION_MODE_BEFORE_HTML: 1065 return $this->step_before_html(); 1066 1067 case WP_HTML_Processor_State::INSERTION_MODE_BEFORE_HEAD: 1068 return $this->step_before_head(); 1069 1070 case WP_HTML_Processor_State::INSERTION_MODE_IN_HEAD: 1071 return $this->step_in_head(); 1072 1073 case WP_HTML_Processor_State::INSERTION_MODE_IN_HEAD_NOSCRIPT: 1074 return $this->step_in_head_noscript(); 1075 1076 case WP_HTML_Processor_State::INSERTION_MODE_AFTER_HEAD: 1077 return $this->step_after_head(); 1078 1079 case WP_HTML_Processor_State::INSERTION_MODE_IN_BODY: 1080 return $this->step_in_body(); 1081 1082 case WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE: 1083 return $this->step_in_table(); 1084 1085 case WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE_TEXT: 1086 return $this->step_in_table_text(); 1087 1088 case WP_HTML_Processor_State::INSERTION_MODE_IN_CAPTION: 1089 return $this->step_in_caption(); 1090 1091 case WP_HTML_Processor_State::INSERTION_MODE_IN_COLUMN_GROUP: 1092 return $this->step_in_column_group(); 1093 1094 case WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE_BODY: 1095 return $this->step_in_table_body(); 1096 1097 case WP_HTML_Processor_State::INSERTION_MODE_IN_ROW: 1098 return $this->step_in_row(); 1099 1100 case WP_HTML_Processor_State::INSERTION_MODE_IN_CELL: 1101 return $this->step_in_cell(); 1102 1103 case WP_HTML_Processor_State::INSERTION_MODE_IN_SELECT: 1104 return $this->step_in_select(); 1105 1106 case WP_HTML_Processor_State::INSERTION_MODE_IN_SELECT_IN_TABLE: 1107 return $this->step_in_select_in_table(); 1108 1109 case WP_HTML_Processor_State::INSERTION_MODE_IN_TEMPLATE: 1110 return $this->step_in_template(); 1111 1112 case WP_HTML_Processor_State::INSERTION_MODE_AFTER_BODY: 1113 return $this->step_after_body(); 1114 1115 case WP_HTML_Processor_State::INSERTION_MODE_IN_FRAMESET: 1116 return $this->step_in_frameset(); 1117 1118 case WP_HTML_Processor_State::INSERTION_MODE_AFTER_FRAMESET: 1119 return $this->step_after_frameset(); 1120 1121 case WP_HTML_Processor_State::INSERTION_MODE_AFTER_AFTER_BODY: 1122 return $this->step_after_after_body(); 1123 1124 case WP_HTML_Processor_State::INSERTION_MODE_AFTER_AFTER_FRAMESET: 1125 return $this->step_after_after_frameset(); 1126 1127 // This should be unreachable but PHP doesn't have total type checking on switch. 1128 default: 1129 $this->bail( "Unaware of the requested parsing mode: '{$this->state->insertion_mode}'." ); 1130 } 1131 } catch ( WP_HTML_Unsupported_Exception $e ) { 1132 /* 1133 * Exceptions are used in this class to escape deep call stacks that 1134 * otherwise might involve messier calling and return conventions. 1135 */ 1136 return false; 1137 } 1138 } 1139 1140 /** 1141 * Computes the HTML breadcrumbs for the currently-matched node, if matched. 1142 * 1143 * Breadcrumbs start at the outermost parent and descend toward the matched element. 1144 * They always include the entire path from the root HTML node to the matched element. 1145 * 1146 * Example: 1147 * 1148 * $processor = WP_HTML_Processor::create_fragment( '<p><strong><em><img></em></strong></p>' ); 1149 * $processor->next_tag( 'IMG' ); 1150 * $processor->get_breadcrumbs() === array( 'HTML', 'BODY', 'P', 'STRONG', 'EM', 'IMG' ); 1151 * 1152 * @since 6.4.0 1153 * 1154 * @return string[] Array of tag names representing path to matched node. 1155 */ 1156 public function get_breadcrumbs(): array { 1157 return $this->breadcrumbs; 1158 } 1159 1160 /** 1161 * Returns the nesting depth of the current location in the document. 1162 * 1163 * Example: 1164 * 1165 * $processor = WP_HTML_Processor::create_fragment( '<div><p></p></div>' ); 1166 * // The processor starts in the BODY context, meaning it has depth from the start: HTML > BODY. 1167 * 2 === $processor->get_current_depth(); 1168 * 1169 * // Opening the DIV element increases the depth. 1170 * $processor->next_token(); 1171 * 3 === $processor->get_current_depth(); 1172 * 1173 * // Opening the P element increases the depth. 1174 * $processor->next_token(); 1175 * 4 === $processor->get_current_depth(); 1176 * 1177 * // The P element is closed during `next_token()` so the depth is decreased to reflect that. 1178 * $processor->next_token(); 1179 * 3 === $processor->get_current_depth(); 1180 * 1181 * @since 6.6.0 1182 * 1183 * @return int Nesting-depth of current location in the document. 1184 */ 1185 public function get_current_depth(): int { 1186 return count( $this->breadcrumbs ); 1187 } 1188 1189 /** 1190 * Normalizes an HTML fragment by serializing it. 1191 * 1192 * This method assumes that the given HTML snippet is found in BODY context. 1193 * For normalizing full documents or fragments found in other contexts, create 1194 * a new processor using {@see WP_HTML_Processor::create_fragment} or 1195 * {@see WP_HTML_Processor::create_full_parser} and call {@see WP_HTML_Processor::serialize} 1196 * on the created instances. 1197 * 1198 * Many aspects of an input HTML fragment may be changed during normalization. 1199 * 1200 * - Attribute values will be double-quoted. 1201 * - Duplicate attributes will be removed. 1202 * - Omitted tags will be added. 1203 * - Tag and attribute name casing will be lower-cased, 1204 * except for specific SVG and MathML tags or attributes. 1205 * - Text will be re-encoded, null bytes handled, 1206 * and invalid UTF-8 replaced with U+FFFD. 1207 * - Any incomplete syntax trailing at the end will be omitted, 1208 * for example, an unclosed comment opener will be removed. 1209 * 1210 * Example: 1211 * 1212 * echo WP_HTML_Processor::normalize( '<a href=#anchor v=5 href="/" enabled>One</a another v=5><!--' ); 1213 * // <a href="#anchor" v="5" enabled>One</a> 1214 * 1215 * echo WP_HTML_Processor::normalize( '<div></p>fun<table><td>cell</div>' ); 1216 * // <div><p></p>fun<table><tbody><tr><td>cell</td></tr></tbody></table></div> 1217 * 1218 * echo WP_HTML_Processor::normalize( '<![CDATA[invalid comment]]> syntax < <> "oddities"' ); 1219 * // <!--[CDATA[invalid comment]]--> syntax < <> "oddities" 1220 * 1221 * @since 6.7.0 1222 * 1223 * @param string $html Input HTML to normalize. 1224 * 1225 * @return string|null Normalized output, or `null` if unable to normalize. 1226 */ 1227 public static function normalize( string $html ): ?string { 1228 return static::create_fragment( $html )->serialize(); 1229 } 1230 1231 /** 1232 * Returns normalized HTML for a fragment by serializing it. 1233 * 1234 * This differs from {@see WP_HTML_Processor::normalize} in that it starts with 1235 * a specific HTML Processor, which _must_ not have already started scanning; 1236 * it must be in the initial ready state and will be in the completed state once 1237 * serialization is complete. 1238 * 1239 * Many aspects of an input HTML fragment may be changed during normalization. 1240 * 1241 * - Attribute values will be double-quoted. 1242 * - Duplicate attributes will be removed. 1243 * - Omitted tags will be added. 1244 * - Tag and attribute name casing will be lower-cased, 1245 * except for specific SVG and MathML tags or attributes. 1246 * - Text will be re-encoded, null bytes handled, 1247 * and invalid UTF-8 replaced with U+FFFD. 1248 * - Any incomplete syntax trailing at the end will be omitted, 1249 * for example, an unclosed comment opener will be removed. 1250 * 1251 * Example: 1252 * 1253 * $processor = WP_HTML_Processor::create_fragment( '<a href=#anchor v=5 href="/" enabled>One</a another v=5><!--' ); 1254 * echo $processor->serialize(); 1255 * // <a href="#anchor" v="5" enabled>One</a> 1256 * 1257 * $processor = WP_HTML_Processor::create_fragment( '<div></p>fun<table><td>cell</div>' ); 1258 * echo $processor->serialize(); 1259 * // <div><p></p>fun<table><tbody><tr><td>cell</td></tr></tbody></table></div> 1260 * 1261 * $processor = WP_HTML_Processor::create_fragment( '<![CDATA[invalid comment]]> syntax < <> "oddities"' ); 1262 * echo $processor->serialize(); 1263 * // <!--[CDATA[invalid comment]]--> syntax < <> "oddities" 1264 * 1265 * @since 6.7.0 1266 * 1267 * @return string|null Normalized HTML markup represented by processor, 1268 * or `null` if unable to generate serialization. 1269 */ 1270 public function serialize(): ?string { 1271 if ( WP_HTML_Tag_Processor::STATE_READY !== $this->parser_state ) { 1272 wp_trigger_error( 1273 __METHOD__, 1274 'An HTML Processor which has already started processing cannot serialize its contents. Serialize immediately after creating the instance.', 1275 E_USER_WARNING 1276 ); 1277 return null; 1278 } 1279 1280 $html = ''; 1281 while ( $this->next_token() ) { 1282 $html .= $this->serialize_token(); 1283 } 1284 1285 if ( null !== $this->get_last_error() ) { 1286 wp_trigger_error( 1287 __METHOD__, 1288 "Cannot serialize HTML Processor with parsing error: {$this->get_last_error()}.", 1289 E_USER_WARNING 1290 ); 1291 return null; 1292 } 1293 1294 return $html; 1295 } 1296 1297 /** 1298 * Serializes the currently-matched token. 1299 * 1300 * This method produces a fully-normative HTML string for the currently-matched token, 1301 * if able. If not matched at any token or if the token doesn't correspond to any HTML 1302 * it will return an empty string (for example, presumptuous end tags are ignored). 1303 * 1304 * @see static::serialize() 1305 * 1306 * @since 6.7.0 1307 * 1308 * @return string Serialization of token, or empty string if no serialization exists. 1309 */ 1310 protected function serialize_token(): string { 1311 $html = ''; 1312 $token_type = $this->get_token_type(); 1313 1314 switch ( $token_type ) { 1315 case '#doctype': 1316 $doctype = $this->get_doctype_info(); 1317 if ( null === $doctype ) { 1318 break; 1319 } 1320 1321 $html .= '<!DOCTYPE'; 1322 1323 if ( $doctype->name ) { 1324 $html .= " {$doctype->name}"; 1325 } 1326 1327 if ( null !== $doctype->public_identifier ) { 1328 $quote = str_contains( $doctype->public_identifier, '"' ) ? "'" : '"'; 1329 $html .= " PUBLIC {$quote}{$doctype->public_identifier}{$quote}"; 1330 } 1331 if ( null !== $doctype->system_identifier ) { 1332 if ( null === $doctype->public_identifier ) { 1333 $html .= ' SYSTEM'; 1334 } 1335 $quote = str_contains( $doctype->system_identifier, '"' ) ? "'" : '"'; 1336 $html .= " {$quote}{$doctype->system_identifier}{$quote}"; 1337 } 1338 1339 $html .= '>'; 1340 break; 1341 1342 case '#text': 1343 $html .= htmlspecialchars( $this->get_modifiable_text(), ENT_QUOTES | ENT_SUBSTITUTE | ENT_HTML5, 'UTF-8' ); 1344 break; 1345 1346 // Unlike the `<>` which is interpreted as plaintext, this is ignored entirely. 1347 case '#presumptuous-tag': 1348 break; 1349 1350 case '#funky-comment': 1351 case '#comment': 1352 $html .= "<!--{$this->get_full_comment_text()}-->"; 1353 break; 1354 1355 case '#cdata-section': 1356 $html .= "<![CDATA[{$this->get_modifiable_text()}]]>"; 1357 break; 1358 } 1359 1360 if ( '#tag' !== $token_type ) { 1361 return $html; 1362 } 1363 1364 $tag_name = str_replace( "\x00", "\u{FFFD}", $this->get_tag() ); 1365 $in_html = 'html' === $this->get_namespace(); 1366 $qualified_name = $in_html ? strtolower( $tag_name ) : $this->get_qualified_tag_name(); 1367 1368 if ( $this->is_tag_closer() ) { 1369 $html .= "</{$qualified_name}>"; 1370 return $html; 1371 } 1372 1373 $attribute_names = $this->get_attribute_names_with_prefix( '' ); 1374 if ( ! isset( $attribute_names ) ) { 1375 $html .= "<{$qualified_name}>"; 1376 return $html; 1377 } 1378 1379 $html .= "<{$qualified_name}"; 1380 foreach ( $attribute_names as $attribute_name ) { 1381 $html .= " {$this->get_qualified_attribute_name( $attribute_name )}"; 1382 $value = $this->get_attribute( $attribute_name ); 1383 1384 if ( is_string( $value ) ) { 1385 $html .= '="' . htmlspecialchars( $value, ENT_QUOTES | ENT_SUBSTITUTE | ENT_HTML5 ) . '"'; 1386 } 1387 1388 $html = str_replace( "\x00", "\u{FFFD}", $html ); 1389 } 1390 1391 if ( ! $in_html && $this->has_self_closing_flag() ) { 1392 $html .= ' /'; 1393 } 1394 1395 $html .= '>'; 1396 1397 // Flush out self-contained elements. 1398 if ( $in_html && in_array( $tag_name, array( 'IFRAME', 'NOEMBED', 'NOFRAMES', 'SCRIPT', 'STYLE', 'TEXTAREA', 'TITLE', 'XMP' ), true ) ) { 1399 $text = $this->get_modifiable_text(); 1400 1401 switch ( $tag_name ) { 1402 case 'IFRAME': 1403 case 'NOEMBED': 1404 case 'NOFRAMES': 1405 $text = ''; 1406 break; 1407 1408 case 'SCRIPT': 1409 case 'STYLE': 1410 break; 1411 1412 default: 1413 $text = htmlspecialchars( $text, ENT_QUOTES | ENT_SUBSTITUTE | ENT_HTML5, 'UTF-8' ); 1414 } 1415 1416 $html .= "{$text}</{$qualified_name}>"; 1417 } 1418 1419 return $html; 1420 } 1421 1422 /** 1423 * Parses next element in the 'initial' insertion mode. 1424 * 1425 * This internal function performs the 'initial' insertion mode 1426 * logic for the generalized WP_HTML_Processor::step() function. 1427 * 1428 * @since 6.7.0 1429 * 1430 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. 1431 * 1432 * @see https://html.spec.whatwg.org/#the-initial-insertion-mode 1433 * @see WP_HTML_Processor::step 1434 * 1435 * @return bool Whether an element was found. 1436 */ 1437 private function step_initial(): bool { 1438 $token_name = $this->get_token_name(); 1439 $token_type = $this->get_token_type(); 1440 $op_sigil = '#tag' === $token_type ? ( parent::is_tag_closer() ? '-' : '+' ) : ''; 1441 $op = "{$op_sigil}{$token_name}"; 1442 1443 switch ( $op ) { 1444 /* 1445 * > A character token that is one of U+0009 CHARACTER TABULATION, 1446 * > U+000A LINE FEED (LF), U+000C FORM FEED (FF), 1447 * > U+000D CARRIAGE RETURN (CR), or U+0020 SPACE 1448 * 1449 * Parse error: ignore the token. 1450 */ 1451 case '#text': 1452 if ( parent::TEXT_IS_WHITESPACE === $this->text_node_classification ) { 1453 return $this->step(); 1454 } 1455 goto initial_anything_else; 1456 break; 1457 1458 /* 1459 * > A comment token 1460 */ 1461 case '#comment': 1462 case '#funky-comment': 1463 case '#presumptuous-tag': 1464 $this->insert_html_element( $this->state->current_token ); 1465 return true; 1466 1467 /* 1468 * > A DOCTYPE token 1469 */ 1470 case 'html': 1471 $doctype = $this->get_doctype_info(); 1472 if ( null !== $doctype && 'quirks' === $doctype->indicated_compatability_mode ) { 1473 $this->compat_mode = WP_HTML_Tag_Processor::QUIRKS_MODE; 1474 } 1475 1476 /* 1477 * > Then, switch the insertion mode to "before html". 1478 */ 1479 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_BEFORE_HTML; 1480 $this->insert_html_element( $this->state->current_token ); 1481 return true; 1482 } 1483 1484 /* 1485 * > Anything else 1486 */ 1487 initial_anything_else: 1488 $this->compat_mode = WP_HTML_Tag_Processor::QUIRKS_MODE; 1489 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_BEFORE_HTML; 1490 return $this->step( self::REPROCESS_CURRENT_NODE ); 1491 } 1492 1493 /** 1494 * Parses next element in the 'before html' insertion mode. 1495 * 1496 * This internal function performs the 'before html' insertion mode 1497 * logic for the generalized WP_HTML_Processor::step() function. 1498 * 1499 * @since 6.7.0 1500 * 1501 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. 1502 * 1503 * @see https://html.spec.whatwg.org/#the-before-html-insertion-mode 1504 * @see WP_HTML_Processor::step 1505 * 1506 * @return bool Whether an element was found. 1507 */ 1508 private function step_before_html(): bool { 1509 $token_name = $this->get_token_name(); 1510 $token_type = $this->get_token_type(); 1511 $is_closer = parent::is_tag_closer(); 1512 $op_sigil = '#tag' === $token_type ? ( $is_closer ? '-' : '+' ) : ''; 1513 $op = "{$op_sigil}{$token_name}"; 1514 1515 switch ( $op ) { 1516 /* 1517 * > A DOCTYPE token 1518 */ 1519 case 'html': 1520 // Parse error: ignore the token. 1521 return $this->step(); 1522 1523 /* 1524 * > A comment token 1525 */ 1526 case '#comment': 1527 case '#funky-comment': 1528 case '#presumptuous-tag': 1529 $this->insert_html_element( $this->state->current_token ); 1530 return true; 1531 1532 /* 1533 * > A character token that is one of U+0009 CHARACTER TABULATION, 1534 * > U+000A LINE FEED (LF), U+000C FORM FEED (FF), 1535 * > U+000D CARRIAGE RETURN (CR), or U+0020 SPACE 1536 * 1537 * Parse error: ignore the token. 1538 */ 1539 case '#text': 1540 if ( parent::TEXT_IS_WHITESPACE === $this->text_node_classification ) { 1541 return $this->step(); 1542 } 1543 goto before_html_anything_else; 1544 break; 1545 1546 /* 1547 * > A start tag whose tag name is "html" 1548 */ 1549 case '+HTML': 1550 $this->insert_html_element( $this->state->current_token ); 1551 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_BEFORE_HEAD; 1552 return true; 1553 1554 /* 1555 * > An end tag whose tag name is one of: "head", "body", "html", "br" 1556 * 1557 * Closing BR tags are always reported by the Tag Processor as opening tags. 1558 */ 1559 case '-HEAD': 1560 case '-BODY': 1561 case '-HTML': 1562 /* 1563 * > Act as described in the "anything else" entry below. 1564 */ 1565 goto before_html_anything_else; 1566 break; 1567 } 1568 1569 /* 1570 * > Any other end tag 1571 */ 1572 if ( $is_closer ) { 1573 // Parse error: ignore the token. 1574 return $this->step(); 1575 } 1576 1577 /* 1578 * > Anything else. 1579 * 1580 * > Create an html element whose node document is the Document object. 1581 * > Append it to the Document object. Put this element in the stack of open elements. 1582 * > Switch the insertion mode to "before head", then reprocess the token. 1583 */ 1584 before_html_anything_else: 1585 $this->insert_virtual_node( 'HTML' ); 1586 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_BEFORE_HEAD; 1587 return $this->step( self::REPROCESS_CURRENT_NODE ); 1588 } 1589 1590 /** 1591 * Parses next element in the 'before head' insertion mode. 1592 * 1593 * This internal function performs the 'before head' insertion mode 1594 * logic for the generalized WP_HTML_Processor::step() function. 1595 * 1596 * @since 6.7.0 Stub implementation. 1597 * 1598 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. 1599 * 1600 * @see https://html.spec.whatwg.org/#the-before-head-insertion-mode 1601 * @see WP_HTML_Processor::step 1602 * 1603 * @return bool Whether an element was found. 1604 */ 1605 private function step_before_head(): bool { 1606 $token_name = $this->get_token_name(); 1607 $token_type = $this->get_token_type(); 1608 $is_closer = parent::is_tag_closer(); 1609 $op_sigil = '#tag' === $token_type ? ( $is_closer ? '-' : '+' ) : ''; 1610 $op = "{$op_sigil}{$token_name}"; 1611 1612 switch ( $op ) { 1613 /* 1614 * > A character token that is one of U+0009 CHARACTER TABULATION, 1615 * > U+000A LINE FEED (LF), U+000C FORM FEED (FF), 1616 * > U+000D CARRIAGE RETURN (CR), or U+0020 SPACE 1617 * 1618 * Parse error: ignore the token. 1619 */ 1620 case '#text': 1621 if ( parent::TEXT_IS_WHITESPACE === $this->text_node_classification ) { 1622 return $this->step(); 1623 } 1624 goto before_head_anything_else; 1625 break; 1626 1627 /* 1628 * > A comment token 1629 */ 1630 case '#comment': 1631 case '#funky-comment': 1632 case '#presumptuous-tag': 1633 $this->insert_html_element( $this->state->current_token ); 1634 return true; 1635 1636 /* 1637 * > A DOCTYPE token 1638 */ 1639 case 'html': 1640 // Parse error: ignore the token. 1641 return $this->step(); 1642 1643 /* 1644 * > A start tag whose tag name is "html" 1645 */ 1646 case '+HTML': 1647 return $this->step_in_body(); 1648 1649 /* 1650 * > A start tag whose tag name is "head" 1651 */ 1652 case '+HEAD': 1653 $this->insert_html_element( $this->state->current_token ); 1654 $this->state->head_element = $this->state->current_token; 1655 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_HEAD; 1656 return true; 1657 1658 /* 1659 * > An end tag whose tag name is one of: "head", "body", "html", "br" 1660 * > Act as described in the "anything else" entry below. 1661 * 1662 * Closing BR tags are always reported by the Tag Processor as opening tags. 1663 */ 1664 case '-HEAD': 1665 case '-BODY': 1666 case '-HTML': 1667 goto before_head_anything_else; 1668 break; 1669 } 1670 1671 if ( $is_closer ) { 1672 // Parse error: ignore the token. 1673 return $this->step(); 1674 } 1675 1676 /* 1677 * > Anything else 1678 * 1679 * > Insert an HTML element for a "head" start tag token with no attributes. 1680 */ 1681 before_head_anything_else: 1682 $this->state->head_element = $this->insert_virtual_node( 'HEAD' ); 1683 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_HEAD; 1684 return $this->step( self::REPROCESS_CURRENT_NODE ); 1685 } 1686 1687 /** 1688 * Parses next element in the 'in head' insertion mode. 1689 * 1690 * This internal function performs the 'in head' insertion mode 1691 * logic for the generalized WP_HTML_Processor::step() function. 1692 * 1693 * @since 6.7.0 1694 * 1695 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. 1696 * 1697 * @see https://html.spec.whatwg.org/multipage/parsing.html#parsing-main-inhead 1698 * @see WP_HTML_Processor::step 1699 * 1700 * @return bool Whether an element was found. 1701 */ 1702 private function step_in_head(): bool { 1703 $token_name = $this->get_token_name(); 1704 $token_type = $this->get_token_type(); 1705 $is_closer = parent::is_tag_closer(); 1706 $op_sigil = '#tag' === $token_type ? ( $is_closer ? '-' : '+' ) : ''; 1707 $op = "{$op_sigil}{$token_name}"; 1708 1709 switch ( $op ) { 1710 case '#text': 1711 /* 1712 * > A character token that is one of U+0009 CHARACTER TABULATION, 1713 * > U+000A LINE FEED (LF), U+000C FORM FEED (FF), 1714 * > U+000D CARRIAGE RETURN (CR), or U+0020 SPACE 1715 */ 1716 if ( parent::TEXT_IS_WHITESPACE === $this->text_node_classification ) { 1717 // Insert the character. 1718 $this->insert_html_element( $this->state->current_token ); 1719 return true; 1720 } 1721 1722 goto in_head_anything_else; 1723 break; 1724 1725 /* 1726 * > A comment token 1727 */ 1728 case '#comment': 1729 case '#funky-comment': 1730 case '#presumptuous-tag': 1731 $this->insert_html_element( $this->state->current_token ); 1732 return true; 1733 1734 /* 1735 * > A DOCTYPE token 1736 */ 1737 case 'html': 1738 // Parse error: ignore the token. 1739 return $this->step(); 1740 1741 /* 1742 * > A start tag whose tag name is "html" 1743 */ 1744 case '+HTML': 1745 return $this->step_in_body(); 1746 1747 /* 1748 * > A start tag whose tag name is one of: "base", "basefont", "bgsound", "link" 1749 */ 1750 case '+BASE': 1751 case '+BASEFONT': 1752 case '+BGSOUND': 1753 case '+LINK': 1754 $this->insert_html_element( $this->state->current_token ); 1755 return true; 1756 1757 /* 1758 * > A start tag whose tag name is "meta" 1759 */ 1760 case '+META': 1761 $this->insert_html_element( $this->state->current_token ); 1762 1763 /* 1764 * > If the active speculative HTML parser is null, then: 1765 * > - If the element has a charset attribute, and getting an encoding from 1766 * > its value results in an encoding, and the confidence is currently 1767 * > tentative, then change the encoding to the resulting encoding. 1768 */ 1769 $charset = $this->get_attribute( 'charset' ); 1770 if ( is_string( $charset ) && 'tentative' === $this->state->encoding_confidence ) { 1771 $this->bail( 'Cannot yet process META tags with charset to determine encoding.' ); 1772 } 1773 1774 /* 1775 * > - Otherwise, if the element has an http-equiv attribute whose value is 1776 * > an ASCII case-insensitive match for the string "Content-Type", and 1777 * > the element has a content attribute, and applying the algorithm for 1778 * > extracting a character encoding from a meta element to that attribute's 1779 * > value returns an encoding, and the confidence is currently tentative, 1780 * > then change the encoding to the extracted encoding. 1781 */ 1782 $http_equiv = $this->get_attribute( 'http-equiv' ); 1783 $content = $this->get_attribute( 'content' ); 1784 if ( 1785 is_string( $http_equiv ) && 1786 is_string( $content ) && 1787 0 === strcasecmp( $http_equiv, 'Content-Type' ) && 1788 'tentative' === $this->state->encoding_confidence 1789 ) { 1790 $this->bail( 'Cannot yet process META tags with http-equiv Content-Type to determine encoding.' ); 1791 } 1792 1793 return true; 1794 1795 /* 1796 * > A start tag whose tag name is "title" 1797 */ 1798 case '+TITLE': 1799 $this->insert_html_element( $this->state->current_token ); 1800 return true; 1801 1802 /* 1803 * > A start tag whose tag name is "noscript", if the scripting flag is enabled 1804 * > A start tag whose tag name is one of: "noframes", "style" 1805 * 1806 * The scripting flag is never enabled in this parser. 1807 */ 1808 case '+NOFRAMES': 1809 case '+STYLE': 1810 $this->insert_html_element( $this->state->current_token ); 1811 return true; 1812 1813 /* 1814 * > A start tag whose tag name is "noscript", if the scripting flag is disabled 1815 */ 1816 case '+NOSCRIPT': 1817 $this->insert_html_element( $this->state->current_token ); 1818 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_HEAD_NOSCRIPT; 1819 return true; 1820 1821 /* 1822 * > A start tag whose tag name is "script" 1823 * 1824 * @todo Could the adjusted insertion location be anything other than the current location? 1825 */ 1826 case '+SCRIPT': 1827 $this->insert_html_element( $this->state->current_token ); 1828 return true; 1829 1830 /* 1831 * > An end tag whose tag name is "head" 1832 */ 1833 case '-HEAD': 1834 $this->state->stack_of_open_elements->pop(); 1835 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_AFTER_HEAD; 1836 return true; 1837 1838 /* 1839 * > An end tag whose tag name is one of: "body", "html", "br" 1840 * 1841 * BR tags are always reported by the Tag Processor as opening tags. 1842 */ 1843 case '-BODY': 1844 case '-HTML': 1845 /* 1846 * > Act as described in the "anything else" entry below. 1847 */ 1848 goto in_head_anything_else; 1849 break; 1850 1851 /* 1852 * > A start tag whose tag name is "template" 1853 * 1854 * @todo Could the adjusted insertion location be anything other than the current location? 1855 */ 1856 case '+TEMPLATE': 1857 $this->state->active_formatting_elements->insert_marker(); 1858 $this->state->frameset_ok = false; 1859 1860 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TEMPLATE; 1861 $this->state->stack_of_template_insertion_modes[] = WP_HTML_Processor_State::INSERTION_MODE_IN_TEMPLATE; 1862 1863 $this->insert_html_element( $this->state->current_token ); 1864 return true; 1865 1866 /* 1867 * > An end tag whose tag name is "template" 1868 */ 1869 case '-TEMPLATE': 1870 if ( ! $this->state->stack_of_open_elements->contains( 'TEMPLATE' ) ) { 1871 // @todo Indicate a parse error once it's possible. 1872 return $this->step(); 1873 } 1874 1875 $this->generate_implied_end_tags_thoroughly(); 1876 if ( ! $this->state->stack_of_open_elements->current_node_is( 'TEMPLATE' ) ) { 1877 // @todo Indicate a parse error once it's possible. 1878 } 1879 1880 $this->state->stack_of_open_elements->pop_until( 'TEMPLATE' ); 1881 $this->state->active_formatting_elements->clear_up_to_last_marker(); 1882 array_pop( $this->state->stack_of_template_insertion_modes ); 1883 $this->reset_insertion_mode_appropriately(); 1884 return true; 1885 } 1886 1887 /* 1888 * > A start tag whose tag name is "head" 1889 * > Any other end tag 1890 */ 1891 if ( '+HEAD' === $op || $is_closer ) { 1892 // Parse error: ignore the token. 1893 return $this->step(); 1894 } 1895 1896 /* 1897 * > Anything else 1898 */ 1899 in_head_anything_else: 1900 $this->state->stack_of_open_elements->pop(); 1901 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_AFTER_HEAD; 1902 return $this->step( self::REPROCESS_CURRENT_NODE ); 1903 } 1904 1905 /** 1906 * Parses next element in the 'in head noscript' insertion mode. 1907 * 1908 * This internal function performs the 'in head noscript' insertion mode 1909 * logic for the generalized WP_HTML_Processor::step() function. 1910 * 1911 * @since 6.7.0 Stub implementation. 1912 * 1913 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. 1914 * 1915 * @see https://html.spec.whatwg.org/#parsing-main-inheadnoscript 1916 * @see WP_HTML_Processor::step 1917 * 1918 * @return bool Whether an element was found. 1919 */ 1920 private function step_in_head_noscript(): bool { 1921 $token_name = $this->get_token_name(); 1922 $token_type = $this->get_token_type(); 1923 $is_closer = parent::is_tag_closer(); 1924 $op_sigil = '#tag' === $token_type ? ( $is_closer ? '-' : '+' ) : ''; 1925 $op = "{$op_sigil}{$token_name}"; 1926 1927 switch ( $op ) { 1928 /* 1929 * > A character token that is one of U+0009 CHARACTER TABULATION, 1930 * > U+000A LINE FEED (LF), U+000C FORM FEED (FF), 1931 * > U+000D CARRIAGE RETURN (CR), or U+0020 SPACE 1932 * 1933 * Parse error: ignore the token. 1934 */ 1935 case '#text': 1936 if ( parent::TEXT_IS_WHITESPACE === $this->text_node_classification ) { 1937 return $this->step_in_head(); 1938 } 1939 1940 goto in_head_noscript_anything_else; 1941 break; 1942 1943 /* 1944 * > A DOCTYPE token 1945 */ 1946 case 'html': 1947 // Parse error: ignore the token. 1948 return $this->step(); 1949 1950 /* 1951 * > A start tag whose tag name is "html" 1952 */ 1953 case '+HTML': 1954 return $this->step_in_body(); 1955 1956 /* 1957 * > An end tag whose tag name is "noscript" 1958 */ 1959 case '-NOSCRIPT': 1960 $this->state->stack_of_open_elements->pop(); 1961 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_HEAD; 1962 return true; 1963 1964 /* 1965 * > A comment token 1966 * > 1967 * > A start tag whose tag name is one of: "basefont", "bgsound", 1968 * > "link", "meta", "noframes", "style" 1969 */ 1970 case '#comment': 1971 case '#funky-comment': 1972 case '#presumptuous-tag': 1973 case '+BASEFONT': 1974 case '+BGSOUND': 1975 case '+LINK': 1976 case '+META': 1977 case '+NOFRAMES': 1978 case '+STYLE': 1979 return $this->step_in_head(); 1980 1981 /* 1982 * > An end tag whose tag name is "br" 1983 * 1984 * This should never happen, as the Tag Processor prevents showing a BR closing tag. 1985 */ 1986 } 1987 1988 /* 1989 * > A start tag whose tag name is one of: "head", "noscript" 1990 * > Any other end tag 1991 */ 1992 if ( '+HEAD' === $op || '+NOSCRIPT' === $op || $is_closer ) { 1993 // Parse error: ignore the token. 1994 return $this->step(); 1995 } 1996 1997 /* 1998 * > Anything else 1999 * 2000 * Anything here is a parse error. 2001 */ 2002 in_head_noscript_anything_else: 2003 $this->state->stack_of_open_elements->pop(); 2004 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_HEAD; 2005 return $this->step( self::REPROCESS_CURRENT_NODE ); 2006 } 2007 2008 /** 2009 * Parses next element in the 'after head' insertion mode. 2010 * 2011 * This internal function performs the 'after head' insertion mode 2012 * logic for the generalized WP_HTML_Processor::step() function. 2013 * 2014 * @since 6.7.0 Stub implementation. 2015 * 2016 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. 2017 * 2018 * @see https://html.spec.whatwg.org/#the-after-head-insertion-mode 2019 * @see WP_HTML_Processor::step 2020 * 2021 * @return bool Whether an element was found. 2022 */ 2023 private function step_after_head(): bool { 2024 $token_name = $this->get_token_name(); 2025 $token_type = $this->get_token_type(); 2026 $is_closer = parent::is_tag_closer(); 2027 $op_sigil = '#tag' === $token_type ? ( $is_closer ? '-' : '+' ) : ''; 2028 $op = "{$op_sigil}{$token_name}"; 2029 2030 switch ( $op ) { 2031 /* 2032 * > A character token that is one of U+0009 CHARACTER TABULATION, 2033 * > U+000A LINE FEED (LF), U+000C FORM FEED (FF), 2034 * > U+000D CARRIAGE RETURN (CR), or U+0020 SPACE 2035 */ 2036 case '#text': 2037 if ( parent::TEXT_IS_WHITESPACE === $this->text_node_classification ) { 2038 // Insert the character. 2039 $this->insert_html_element( $this->state->current_token ); 2040 return true; 2041 } 2042 goto after_head_anything_else; 2043 break; 2044 2045 /* 2046 * > A comment token 2047 */ 2048 case '#comment': 2049 case '#funky-comment': 2050 case '#presumptuous-tag': 2051 $this->insert_html_element( $this->state->current_token ); 2052 return true; 2053 2054 /* 2055 * > A DOCTYPE token 2056 */ 2057 case 'html': 2058 // Parse error: ignore the token. 2059 return $this->step(); 2060 2061 /* 2062 * > A start tag whose tag name is "html" 2063 */ 2064 case '+HTML': 2065 return $this->step_in_body(); 2066 2067 /* 2068 * > A start tag whose tag name is "body" 2069 */ 2070 case '+BODY': 2071 $this->insert_html_element( $this->state->current_token ); 2072 $this->state->frameset_ok = false; 2073 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_BODY; 2074 return true; 2075 2076 /* 2077 * > A start tag whose tag name is "frameset" 2078 */ 2079 case '+FRAMESET': 2080 $this->insert_html_element( $this->state->current_token ); 2081 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_FRAMESET; 2082 return true; 2083 2084 /* 2085 * > A start tag whose tag name is one of: "base", "basefont", "bgsound", 2086 * > "link", "meta", "noframes", "script", "style", "template", "title" 2087 * 2088 * Anything here is a parse error. 2089 */ 2090 case '+BASE': 2091 case '+BASEFONT': 2092 case '+BGSOUND': 2093 case '+LINK': 2094 case '+META': 2095 case '+NOFRAMES': 2096 case '+SCRIPT': 2097 case '+STYLE': 2098 case '+TEMPLATE': 2099 case '+TITLE': 2100 /* 2101 * > Push the node pointed to by the head element pointer onto the stack of open elements. 2102 * > Process the token using the rules for the "in head" insertion mode. 2103 * > 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.) 2104 */ 2105 $this->bail( 'Cannot process elements after HEAD which reopen the HEAD element.' ); 2106 /* 2107 * Do not leave this break in when adding support; it's here to prevent 2108 * WPCS from getting confused at the switch structure without a return, 2109 * because it doesn't know that `bail()` always throws. 2110 */ 2111 break; 2112 2113 /* 2114 * > An end tag whose tag name is "template" 2115 */ 2116 case '-TEMPLATE': 2117 return $this->step_in_head(); 2118 2119 /* 2120 * > An end tag whose tag name is one of: "body", "html", "br" 2121 * 2122 * Closing BR tags are always reported by the Tag Processor as opening tags. 2123 */ 2124 case '-BODY': 2125 case '-HTML': 2126 /* 2127 * > Act as described in the "anything else" entry below. 2128 */ 2129 goto after_head_anything_else; 2130 break; 2131 } 2132 2133 /* 2134 * > A start tag whose tag name is "head" 2135 * > Any other end tag 2136 */ 2137 if ( '+HEAD' === $op || $is_closer ) { 2138 // Parse error: ignore the token. 2139 return $this->step(); 2140 } 2141 2142 /* 2143 * > Anything else 2144 * > Insert an HTML element for a "body" start tag token with no attributes. 2145 */ 2146 after_head_anything_else: 2147 $this->insert_virtual_node( 'BODY' ); 2148 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_BODY; 2149 return $this->step( self::REPROCESS_CURRENT_NODE ); 2150 } 2151 2152 /** 2153 * Parses next element in the 'in body' insertion mode. 2154 * 2155 * This internal function performs the 'in body' insertion mode 2156 * logic for the generalized WP_HTML_Processor::step() function. 2157 * 2158 * @since 6.4.0 2159 * 2160 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. 2161 * 2162 * @see https://html.spec.whatwg.org/#parsing-main-inbody 2163 * @see WP_HTML_Processor::step 2164 * 2165 * @return bool Whether an element was found. 2166 */ 2167 private function step_in_body(): bool { 2168 $token_name = $this->get_token_name(); 2169 $token_type = $this->get_token_type(); 2170 $op_sigil = '#tag' === $token_type ? ( parent::is_tag_closer() ? '-' : '+' ) : ''; 2171 $op = "{$op_sigil}{$token_name}"; 2172 2173 switch ( $op ) { 2174 case '#text': 2175 /* 2176 * > A character token that is U+0000 NULL 2177 * 2178 * Any successive sequence of NULL bytes is ignored and won't 2179 * trigger active format reconstruction. Therefore, if the text 2180 * only comprises NULL bytes then the token should be ignored 2181 * here, but if there are any other characters in the stream 2182 * the active formats should be reconstructed. 2183 */ 2184 if ( parent::TEXT_IS_NULL_SEQUENCE === $this->text_node_classification ) { 2185 // Parse error: ignore the token. 2186 return $this->step(); 2187 } 2188 2189 $this->reconstruct_active_formatting_elements(); 2190 2191 /* 2192 * Whitespace-only text does not affect the frameset-ok flag. 2193 * It is probably inter-element whitespace, but it may also 2194 * contain character references which decode only to whitespace. 2195 */ 2196 if ( parent::TEXT_IS_GENERIC === $this->text_node_classification ) { 2197 $this->state->frameset_ok = false; 2198 } 2199 2200 $this->insert_html_element( $this->state->current_token ); 2201 return true; 2202 2203 case '#comment': 2204 case '#funky-comment': 2205 case '#presumptuous-tag': 2206 $this->insert_html_element( $this->state->current_token ); 2207 return true; 2208 2209 /* 2210 * > A DOCTYPE token 2211 * > Parse error. Ignore the token. 2212 */ 2213 case 'html': 2214 return $this->step(); 2215 2216 /* 2217 * > A start tag whose tag name is "html" 2218 */ 2219 case '+HTML': 2220 if ( ! $this->state->stack_of_open_elements->contains( 'TEMPLATE' ) ) { 2221 /* 2222 * > Otherwise, for each attribute on the token, check to see if the attribute 2223 * > is already present on the top element of the stack of open elements. If 2224 * > it is not, add the attribute and its corresponding value to that element. 2225 * 2226 * This parser does not currently support this behavior: ignore the token. 2227 */ 2228 } 2229 2230 // Ignore the token. 2231 return $this->step(); 2232 2233 /* 2234 * > A start tag whose tag name is one of: "base", "basefont", "bgsound", "link", 2235 * > "meta", "noframes", "script", "style", "template", "title" 2236 * > 2237 * > An end tag whose tag name is "template" 2238 */ 2239 case '+BASE': 2240 case '+BASEFONT': 2241 case '+BGSOUND': 2242 case '+LINK': 2243 case '+META': 2244 case '+NOFRAMES': 2245 case '+SCRIPT': 2246 case '+STYLE': 2247 case '+TEMPLATE': 2248 case '+TITLE': 2249 case '-TEMPLATE': 2250 return $this->step_in_head(); 2251 2252 /* 2253 * > A start tag whose tag name is "body" 2254 * 2255 * This tag in the IN BODY insertion mode is a parse error. 2256 */ 2257 case '+BODY': 2258 if ( 2259 1 === $this->state->stack_of_open_elements->count() || 2260 'BODY' !== ( $this->state->stack_of_open_elements->at( 2 )->node_name ?? null ) || 2261 $this->state->stack_of_open_elements->contains( 'TEMPLATE' ) 2262 ) { 2263 // Ignore the token. 2264 return $this->step(); 2265 } 2266 2267 /* 2268 * > Otherwise, set the frameset-ok flag to "not ok"; then, for each attribute 2269 * > on the token, check to see if the attribute is already present on the body 2270 * > element (the second element) on the stack of open elements, and if it is 2271 * > not, add the attribute and its corresponding value to that element. 2272 * 2273 * This parser does not currently support this behavior: ignore the token. 2274 */ 2275 $this->state->frameset_ok = false; 2276 return $this->step(); 2277 2278 /* 2279 * > A start tag whose tag name is "frameset" 2280 * 2281 * This tag in the IN BODY insertion mode is a parse error. 2282 */ 2283 case '+FRAMESET': 2284 if ( 2285 1 === $this->state->stack_of_open_elements->count() || 2286 'BODY' !== ( $this->state->stack_of_open_elements->at( 2 )->node_name ?? null ) || 2287 false === $this->state->frameset_ok 2288 ) { 2289 // Ignore the token. 2290 return $this->step(); 2291 } 2292 2293 /* 2294 * > Otherwise, run the following steps: 2295 */ 2296 $this->bail( 'Cannot process non-ignored FRAMESET tags.' ); 2297 break; 2298 2299 /* 2300 * > An end tag whose tag name is "body" 2301 */ 2302 case '-BODY': 2303 if ( ! $this->state->stack_of_open_elements->has_element_in_scope( 'BODY' ) ) { 2304 // Parse error: ignore the token. 2305 return $this->step(); 2306 } 2307 2308 /* 2309 * > Otherwise, if there is a node in the stack of open elements that is not either a 2310 * > dd element, a dt element, an li element, an optgroup element, an option element, 2311 * > a p element, an rb element, an rp element, an rt element, an rtc element, a tbody 2312 * > element, a td element, a tfoot element, a th element, a thread element, a tr 2313 * > element, the body element, or the html element, then this is a parse error. 2314 * 2315 * There is nothing to do for this parse error, so don't check for it. 2316 */ 2317 2318 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_AFTER_BODY; 2319 /* 2320 * The BODY element is not removed from the stack of open elements. 2321 * Only internal state has changed, this does not qualify as a "step" 2322 * in terms of advancing through the document to another token. 2323 * Nothing has been pushed or popped. 2324 * Proceed to parse the next item. 2325 */ 2326 return $this->step(); 2327 2328 /* 2329 * > An end tag whose tag name is "html" 2330 */ 2331 case '-HTML': 2332 if ( ! $this->state->stack_of_open_elements->has_element_in_scope( 'BODY' ) ) { 2333 // Parse error: ignore the token. 2334 return $this->step(); 2335 } 2336 2337 /* 2338 * > Otherwise, if there is a node in the stack of open elements that is not either a 2339 * > dd element, a dt element, an li element, an optgroup element, an option element, 2340 * > a p element, an rb element, an rp element, an rt element, an rtc element, a tbody 2341 * > element, a td element, a tfoot element, a th element, a thread element, a tr 2342 * > element, the body element, or the html element, then this is a parse error. 2343 * 2344 * There is nothing to do for this parse error, so don't check for it. 2345 */ 2346 2347 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_AFTER_BODY; 2348 return $this->step( self::REPROCESS_CURRENT_NODE ); 2349 2350 /* 2351 * > A start tag whose tag name is one of: "address", "article", "aside", 2352 * > "blockquote", "center", "details", "dialog", "dir", "div", "dl", 2353 * > "fieldset", "figcaption", "figure", "footer", "header", "hgroup", 2354 * > "main", "menu", "nav", "ol", "p", "search", "section", "summary", "ul" 2355 */ 2356 case '+ADDRESS': 2357 case '+ARTICLE': 2358 case '+ASIDE': 2359 case '+BLOCKQUOTE': 2360 case '+CENTER': 2361 case '+DETAILS': 2362 case '+DIALOG': 2363 case '+DIR': 2364 case '+DIV': 2365 case '+DL': 2366 case '+FIELDSET': 2367 case '+FIGCAPTION': 2368 case '+FIGURE': 2369 case '+FOOTER': 2370 case '+HEADER': 2371 case '+HGROUP': 2372 case '+MAIN': 2373 case '+MENU': 2374 case '+NAV': 2375 case '+OL': 2376 case '+P': 2377 case '+SEARCH': 2378 case '+SECTION': 2379 case '+SUMMARY': 2380 case '+UL': 2381 if ( $this->state->stack_of_open_elements->has_p_in_button_scope() ) { 2382 $this->close_a_p_element(); 2383 } 2384 2385 $this->insert_html_element( $this->state->current_token ); 2386 return true; 2387 2388 /* 2389 * > A start tag whose tag name is one of: "h1", "h2", "h3", "h4", "h5", "h6" 2390 */ 2391 case '+H1': 2392 case '+H2': 2393 case '+H3': 2394 case '+H4': 2395 case '+H5': 2396 case '+H6': 2397 if ( $this->state->stack_of_open_elements->has_p_in_button_scope() ) { 2398 $this->close_a_p_element(); 2399 } 2400 2401 if ( 2402 in_array( 2403 $this->state->stack_of_open_elements->current_node()->node_name, 2404 array( 'H1', 'H2', 'H3', 'H4', 'H5', 'H6' ), 2405 true 2406 ) 2407 ) { 2408 // @todo Indicate a parse error once it's possible. 2409 $this->state->stack_of_open_elements->pop(); 2410 } 2411 2412 $this->insert_html_element( $this->state->current_token ); 2413 return true; 2414 2415 /* 2416 * > A start tag whose tag name is one of: "pre", "listing" 2417 */ 2418 case '+PRE': 2419 case '+LISTING': 2420 if ( $this->state->stack_of_open_elements->has_p_in_button_scope() ) { 2421 $this->close_a_p_element(); 2422 } 2423 2424 /* 2425 * > If the next token is a U+000A LINE FEED (LF) character token, 2426 * > then ignore that token and move on to the next one. (Newlines 2427 * > at the start of pre blocks are ignored as an authoring convenience.) 2428 * 2429 * This is handled in `get_modifiable_text()`. 2430 */ 2431 2432 $this->insert_html_element( $this->state->current_token ); 2433 $this->state->frameset_ok = false; 2434 return true; 2435 2436 /* 2437 * > A start tag whose tag name is "form" 2438 */ 2439 case '+FORM': 2440 $stack_contains_template = $this->state->stack_of_open_elements->contains( 'TEMPLATE' ); 2441 2442 if ( isset( $this->state->form_element ) && ! $stack_contains_template ) { 2443 // Parse error: ignore the token. 2444 return $this->step(); 2445 } 2446 2447 if ( $this->state->stack_of_open_elements->has_p_in_button_scope() ) { 2448 $this->close_a_p_element(); 2449 } 2450 2451 $this->insert_html_element( $this->state->current_token ); 2452 if ( ! $stack_contains_template ) { 2453 $this->state->form_element = $this->state->current_token; 2454 } 2455 2456 return true; 2457 2458 /* 2459 * > A start tag whose tag name is "li" 2460 * > A start tag whose tag name is one of: "dd", "dt" 2461 */ 2462 case '+DD': 2463 case '+DT': 2464 case '+LI': 2465 $this->state->frameset_ok = false; 2466 $node = $this->state->stack_of_open_elements->current_node(); 2467 $is_li = 'LI' === $token_name; 2468 2469 in_body_list_loop: 2470 /* 2471 * The logic for LI and DT/DD is the same except for one point: LI elements _only_ 2472 * close other LI elements, but a DT or DD element closes _any_ open DT or DD element. 2473 */ 2474 if ( $is_li ? 'LI' === $node->node_name : ( 'DD' === $node->node_name || 'DT' === $node->node_name ) ) { 2475 $node_name = $is_li ? 'LI' : $node->node_name; 2476 $this->generate_implied_end_tags( $node_name ); 2477 if ( ! $this->state->stack_of_open_elements->current_node_is( $node_name ) ) { 2478 // @todo Indicate a parse error once it's possible. This error does not impact the logic here. 2479 } 2480 2481 $this->state->stack_of_open_elements->pop_until( $node_name ); 2482 goto in_body_list_done; 2483 } 2484 2485 if ( 2486 'ADDRESS' !== $node->node_name && 2487 'DIV' !== $node->node_name && 2488 'P' !== $node->node_name && 2489 self::is_special( $node ) 2490 ) { 2491 /* 2492 * > If node is in the special category, but is not an address, div, 2493 * > or p element, then jump to the step labeled done below. 2494 */ 2495 goto in_body_list_done; 2496 } else { 2497 /* 2498 * > Otherwise, set node to the previous entry in the stack of open elements 2499 * > and return to the step labeled loop. 2500 */ 2501 foreach ( $this->state->stack_of_open_elements->walk_up( $node ) as $item ) { 2502 $node = $item; 2503 break; 2504 } 2505 goto in_body_list_loop; 2506 } 2507 2508 in_body_list_done: 2509 if ( $this->state->stack_of_open_elements->has_p_in_button_scope() ) { 2510 $this->close_a_p_element(); 2511 } 2512 2513 $this->insert_html_element( $this->state->current_token ); 2514 return true; 2515 2516 case '+PLAINTEXT': 2517 if ( $this->state->stack_of_open_elements->has_p_in_button_scope() ) { 2518 $this->close_a_p_element(); 2519 } 2520 2521 /* 2522 * @todo This may need to be handled in the Tag Processor and turn into 2523 * a single self-contained tag like TEXTAREA, whose modifiable text 2524 * is the rest of the input document as plaintext. 2525 */ 2526 $this->bail( 'Cannot process PLAINTEXT elements.' ); 2527 break; 2528 2529 /* 2530 * > A start tag whose tag name is "button" 2531 */ 2532 case '+BUTTON': 2533 if ( $this->state->stack_of_open_elements->has_element_in_scope( 'BUTTON' ) ) { 2534 // @todo Indicate a parse error once it's possible. This error does not impact the logic here. 2535 $this->generate_implied_end_tags(); 2536 $this->state->stack_of_open_elements->pop_until( 'BUTTON' ); 2537 } 2538 2539 $this->reconstruct_active_formatting_elements(); 2540 $this->insert_html_element( $this->state->current_token ); 2541 $this->state->frameset_ok = false; 2542 2543 return true; 2544 2545 /* 2546 * > An end tag whose tag name is one of: "address", "article", "aside", "blockquote", 2547 * > "button", "center", "details", "dialog", "dir", "div", "dl", "fieldset", 2548 * > "figcaption", "figure", "footer", "header", "hgroup", "listing", "main", 2549 * > "menu", "nav", "ol", "pre", "search", "section", "summary", "ul" 2550 */ 2551 case '-ADDRESS': 2552 case '-ARTICLE': 2553 case '-ASIDE': 2554 case '-BLOCKQUOTE': 2555 case '-BUTTON': 2556 case '-CENTER': 2557 case '-DETAILS': 2558 case '-DIALOG': 2559 case '-DIR': 2560 case '-DIV': 2561 case '-DL': 2562 case '-FIELDSET': 2563 case '-FIGCAPTION': 2564 case '-FIGURE': 2565 case '-FOOTER': 2566 case '-HEADER': 2567 case '-HGROUP': 2568 case '-LISTING': 2569 case '-MAIN': 2570 case '-MENU': 2571 case '-NAV': 2572 case '-OL': 2573 case '-PRE': 2574 case '-SEARCH': 2575 case '-SECTION': 2576 case '-SUMMARY': 2577 case '-UL': 2578 if ( ! $this->state->stack_of_open_elements->has_element_in_scope( $token_name ) ) { 2579 // @todo Report parse error. 2580 // Ignore the token. 2581 return $this->step(); 2582 } 2583 2584 $this->generate_implied_end_tags(); 2585 if ( ! $this->state->stack_of_open_elements->current_node_is( $token_name ) ) { 2586 // @todo Record parse error: this error doesn't impact parsing. 2587 } 2588 $this->state->stack_of_open_elements->pop_until( $token_name ); 2589 return true; 2590 2591 /* 2592 * > An end tag whose tag name is "form" 2593 */ 2594 case '-FORM': 2595 if ( ! $this->state->stack_of_open_elements->contains( 'TEMPLATE' ) ) { 2596 $node = $this->state->form_element; 2597 $this->state->form_element = null; 2598 2599 /* 2600 * > If node is null or if the stack of open elements does not have node 2601 * > in scope, then this is a parse error; return and ignore the token. 2602 * 2603 * @todo It's necessary to check if the form token itself is in scope, not 2604 * simply whether any FORM is in scope. 2605 */ 2606 if ( 2607 null === $node || 2608 ! $this->state->stack_of_open_elements->has_element_in_scope( 'FORM' ) 2609 ) { 2610 // Parse error: ignore the token. 2611 return $this->step(); 2612 } 2613 2614 $this->generate_implied_end_tags(); 2615 if ( $node !== $this->state->stack_of_open_elements->current_node() ) { 2616 // @todo Indicate a parse error once it's possible. This error does not impact the logic here. 2617 $this->bail( 'Cannot close a FORM when other elements remain open as this would throw off the breadcrumbs for the following tokens.' ); 2618 } 2619 2620 $this->state->stack_of_open_elements->remove_node( $node ); 2621 return true; 2622 } else { 2623 /* 2624 * > If the stack of open elements does not have a form element in scope, 2625 * > then this is a parse error; return and ignore the token. 2626 * 2627 * Note that unlike in the clause above, this is checking for any FORM in scope. 2628 */ 2629 if ( ! $this->state->stack_of_open_elements->has_element_in_scope( 'FORM' ) ) { 2630 // Parse error: ignore the token. 2631 return $this->step(); 2632 } 2633 2634 $this->generate_implied_end_tags(); 2635 2636 if ( ! $this->state->stack_of_open_elements->current_node_is( 'FORM' ) ) { 2637 // @todo Indicate a parse error once it's possible. This error does not impact the logic here. 2638 } 2639 2640 $this->state->stack_of_open_elements->pop_until( 'FORM' ); 2641 return true; 2642 } 2643 break; 2644 2645 /* 2646 * > An end tag whose tag name is "p" 2647 */ 2648 case '-P': 2649 if ( ! $this->state->stack_of_open_elements->has_p_in_button_scope() ) { 2650 $this->insert_html_element( $this->state->current_token ); 2651 } 2652 2653 $this->close_a_p_element(); 2654 return true; 2655 2656 /* 2657 * > An end tag whose tag name is "li" 2658 * > An end tag whose tag name is one of: "dd", "dt" 2659 */ 2660 case '-DD': 2661 case '-DT': 2662 case '-LI': 2663 if ( 2664 /* 2665 * An end tag whose tag name is "li": 2666 * If the stack of open elements does not have an li element in list item scope, 2667 * then this is a parse error; ignore the token. 2668 */ 2669 ( 2670 'LI' === $token_name && 2671 ! $this->state->stack_of_open_elements->has_element_in_list_item_scope( 'LI' ) 2672 ) || 2673 /* 2674 * An end tag whose tag name is one of: "dd", "dt": 2675 * If the stack of open elements does not have an element in scope that is an 2676 * HTML element with the same tag name as that of the token, then this is a 2677 * parse error; ignore the token. 2678 */ 2679 ( 2680 'LI' !== $token_name && 2681 ! $this->state->stack_of_open_elements->has_element_in_scope( $token_name ) 2682 ) 2683 ) { 2684 /* 2685 * This is a parse error, ignore the token. 2686 * 2687 * @todo Indicate a parse error once it's possible. 2688 */ 2689 return $this->step(); 2690 } 2691 2692 $this->generate_implied_end_tags( $token_name ); 2693 2694 if ( ! $this->state->stack_of_open_elements->current_node_is( $token_name ) ) { 2695 // @todo Indicate a parse error once it's possible. This error does not impact the logic here. 2696 } 2697 2698 $this->state->stack_of_open_elements->pop_until( $token_name ); 2699 return true; 2700 2701 /* 2702 * > An end tag whose tag name is one of: "h1", "h2", "h3", "h4", "h5", "h6" 2703 */ 2704 case '-H1': 2705 case '-H2': 2706 case '-H3': 2707 case '-H4': 2708 case '-H5': 2709 case '-H6': 2710 if ( ! $this->state->stack_of_open_elements->has_element_in_scope( '(internal: H1 through H6 - do not use)' ) ) { 2711 /* 2712 * This is a parse error; ignore the token. 2713 * 2714 * @todo Indicate a parse error once it's possible. 2715 */ 2716 return $this->step(); 2717 } 2718 2719 $this->generate_implied_end_tags(); 2720 2721 if ( ! $this->state->stack_of_open_elements->current_node_is( $token_name ) ) { 2722 // @todo Record parse error: this error doesn't impact parsing. 2723 } 2724 2725 $this->state->stack_of_open_elements->pop_until( '(internal: H1 through H6 - do not use)' ); 2726 return true; 2727 2728 /* 2729 * > A start tag whose tag name is "a" 2730 */ 2731 case '+A': 2732 foreach ( $this->state->active_formatting_elements->walk_up() as $item ) { 2733 switch ( $item->node_name ) { 2734 case 'marker': 2735 break 2; 2736 2737 case 'A': 2738 $this->run_adoption_agency_algorithm(); 2739 $this->state->active_formatting_elements->remove_node( $item ); 2740 $this->state->stack_of_open_elements->remove_node( $item ); 2741 break 2; 2742 } 2743 } 2744 2745 $this->reconstruct_active_formatting_elements(); 2746 $this->insert_html_element( $this->state->current_token ); 2747 $this->state->active_formatting_elements->push( $this->state->current_token ); 2748 return true; 2749 2750 /* 2751 * > A start tag whose tag name is one of: "b", "big", "code", "em", "font", "i", 2752 * > "s", "small", "strike", "strong", "tt", "u" 2753 */ 2754 case '+B': 2755 case '+BIG': 2756 case '+CODE': 2757 case '+EM': 2758 case '+FONT': 2759 case '+I': 2760 case '+S': 2761 case '+SMALL': 2762 case '+STRIKE': 2763 case '+STRONG': 2764 case '+TT': 2765 case '+U': 2766 $this->reconstruct_active_formatting_elements(); 2767 $this->insert_html_element( $this->state->current_token ); 2768 $this->state->active_formatting_elements->push( $this->state->current_token ); 2769 return true; 2770 2771 /* 2772 * > A start tag whose tag name is "nobr" 2773 */ 2774 case '+NOBR': 2775 $this->reconstruct_active_formatting_elements(); 2776 2777 if ( $this->state->stack_of_open_elements->has_element_in_scope( 'NOBR' ) ) { 2778 // Parse error. 2779 $this->run_adoption_agency_algorithm(); 2780 $this->reconstruct_active_formatting_elements(); 2781 } 2782 2783 $this->insert_html_element( $this->state->current_token ); 2784 $this->state->active_formatting_elements->push( $this->state->current_token ); 2785 return true; 2786 2787 /* 2788 * > An end tag whose tag name is one of: "a", "b", "big", "code", "em", "font", "i", 2789 * > "nobr", "s", "small", "strike", "strong", "tt", "u" 2790 */ 2791 case '-A': 2792 case '-B': 2793 case '-BIG': 2794 case '-CODE': 2795 case '-EM': 2796 case '-FONT': 2797 case '-I': 2798 case '-NOBR': 2799 case '-S': 2800 case '-SMALL': 2801 case '-STRIKE': 2802 case '-STRONG': 2803 case '-TT': 2804 case '-U': 2805 $this->run_adoption_agency_algorithm(); 2806 return true; 2807 2808 /* 2809 * > A start tag whose tag name is one of: "applet", "marquee", "object" 2810 */ 2811 case '+APPLET': 2812 case '+MARQUEE': 2813 case '+OBJECT': 2814 $this->reconstruct_active_formatting_elements(); 2815 $this->insert_html_element( $this->state->current_token ); 2816 $this->state->active_formatting_elements->insert_marker(); 2817 $this->state->frameset_ok = false; 2818 return true; 2819 2820 /* 2821 * > A end tag token whose tag name is one of: "applet", "marquee", "object" 2822 */ 2823 case '-APPLET': 2824 case '-MARQUEE': 2825 case '-OBJECT': 2826 if ( ! $this->state->stack_of_open_elements->has_element_in_scope( $token_name ) ) { 2827 // Parse error: ignore the token. 2828 return $this->step(); 2829 } 2830 2831 $this->generate_implied_end_tags(); 2832 if ( ! $this->state->stack_of_open_elements->current_node_is( $token_name ) ) { 2833 // This is a parse error. 2834 } 2835 2836 $this->state->stack_of_open_elements->pop_until( $token_name ); 2837 $this->state->active_formatting_elements->clear_up_to_last_marker(); 2838 return true; 2839 2840 /* 2841 * > A start tag whose tag name is "table" 2842 */ 2843 case '+TABLE': 2844 /* 2845 * > If the Document is not set to quirks mode, and the stack of open elements 2846 * > has a p element in button scope, then close a p element. 2847 */ 2848 if ( 2849 WP_HTML_Tag_Processor::QUIRKS_MODE !== $this->compat_mode && 2850 $this->state->stack_of_open_elements->has_p_in_button_scope() 2851 ) { 2852 $this->close_a_p_element(); 2853 } 2854 2855 $this->insert_html_element( $this->state->current_token ); 2856 $this->state->frameset_ok = false; 2857 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE; 2858 return true; 2859 2860 /* 2861 * > An end tag whose tag name is "br" 2862 * 2863 * This is prevented from happening because the Tag Processor 2864 * reports all closing BR tags as if they were opening tags. 2865 */ 2866 2867 /* 2868 * > A start tag whose tag name is one of: "area", "br", "embed", "img", "keygen", "wbr" 2869 */ 2870 case '+AREA': 2871 case '+BR': 2872 case '+EMBED': 2873 case '+IMG': 2874 case '+KEYGEN': 2875 case '+WBR': 2876 $this->reconstruct_active_formatting_elements(); 2877 $this->insert_html_element( $this->state->current_token ); 2878 $this->state->frameset_ok = false; 2879 return true; 2880 2881 /* 2882 * > A start tag whose tag name is "input" 2883 */ 2884 case '+INPUT': 2885 $this->reconstruct_active_formatting_elements(); 2886 $this->insert_html_element( $this->state->current_token ); 2887 2888 /* 2889 * > If the token does not have an attribute with the name "type", or if it does, 2890 * > but that attribute's value is not an ASCII case-insensitive match for the 2891 * > string "hidden", then: set the frameset-ok flag to "not ok". 2892 */ 2893 $type_attribute = $this->get_attribute( 'type' ); 2894 if ( ! is_string( $type_attribute ) || 'hidden' !== strtolower( $type_attribute ) ) { 2895 $this->state->frameset_ok = false; 2896 } 2897 2898 return true; 2899 2900 /* 2901 * > A start tag whose tag name is one of: "param", "source", "track" 2902 */ 2903 case '+PARAM': 2904 case '+SOURCE': 2905 case '+TRACK': 2906 $this->insert_html_element( $this->state->current_token ); 2907 return true; 2908 2909 /* 2910 * > A start tag whose tag name is "hr" 2911 */ 2912 case '+HR': 2913 if ( $this->state->stack_of_open_elements->has_p_in_button_scope() ) { 2914 $this->close_a_p_element(); 2915 } 2916 $this->insert_html_element( $this->state->current_token ); 2917 $this->state->frameset_ok = false; 2918 return true; 2919 2920 /* 2921 * > A start tag whose tag name is "image" 2922 */ 2923 case '+IMAGE': 2924 /* 2925 * > Parse error. Change the token's tag name to "img" and reprocess it. (Don't ask.) 2926 * 2927 * Note that this is handled elsewhere, so it should not be possible to reach this code. 2928 */ 2929 $this->bail( "Cannot process an IMAGE tag. (Don't ask.)" ); 2930 break; 2931 2932 /* 2933 * > A start tag whose tag name is "textarea" 2934 */ 2935 case '+TEXTAREA': 2936 $this->insert_html_element( $this->state->current_token ); 2937 2938 /* 2939 * > If the next token is a U+000A LINE FEED (LF) character token, then ignore 2940 * > that token and move on to the next one. (Newlines at the start of 2941 * > textarea elements are ignored as an authoring convenience.) 2942 * 2943 * This is handled in `get_modifiable_text()`. 2944 */ 2945 2946 $this->state->frameset_ok = false; 2947 2948 /* 2949 * > Switch the insertion mode to "text". 2950 * 2951 * As a self-contained node, this behavior is handled in the Tag Processor. 2952 */ 2953 return true; 2954 2955 /* 2956 * > A start tag whose tag name is "xmp" 2957 */ 2958 case '+XMP': 2959 if ( $this->state->stack_of_open_elements->has_p_in_button_scope() ) { 2960 $this->close_a_p_element(); 2961 } 2962 2963 $this->reconstruct_active_formatting_elements(); 2964 $this->state->frameset_ok = false; 2965 2966 /* 2967 * > Follow the generic raw text element parsing algorithm. 2968 * 2969 * As a self-contained node, this behavior is handled in the Tag Processor. 2970 */ 2971 $this->insert_html_element( $this->state->current_token ); 2972 return true; 2973 2974 /* 2975 * A start tag whose tag name is "iframe" 2976 */ 2977 case '+IFRAME': 2978 $this->state->frameset_ok = false; 2979 2980 /* 2981 * > Follow the generic raw text element parsing algorithm. 2982 * 2983 * As a self-contained node, this behavior is handled in the Tag Processor. 2984 */ 2985 $this->insert_html_element( $this->state->current_token ); 2986 return true; 2987 2988 /* 2989 * > A start tag whose tag name is "noembed" 2990 * > A start tag whose tag name is "noscript", if the scripting flag is enabled 2991 * 2992 * The scripting flag is never enabled in this parser. 2993 */ 2994 case '+NOEMBED': 2995 $this->insert_html_element( $this->state->current_token ); 2996 return true; 2997 2998 /* 2999 * > A start tag whose tag name is "select" 3000 */ 3001 case '+SELECT': 3002 $this->reconstruct_active_formatting_elements(); 3003 $this->insert_html_element( $this->state->current_token ); 3004 $this->state->frameset_ok = false; 3005 3006 switch ( $this->state->insertion_mode ) { 3007 /* 3008 * > If the insertion mode is one of "in table", "in caption", "in table body", "in row", 3009 * > or "in cell", then switch the insertion mode to "in select in table". 3010 */ 3011 case WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE: 3012 case WP_HTML_Processor_State::INSERTION_MODE_IN_CAPTION: 3013 case WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE_BODY: 3014 case WP_HTML_Processor_State::INSERTION_MODE_IN_ROW: 3015 case WP_HTML_Processor_State::INSERTION_MODE_IN_CELL: 3016 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_SELECT_IN_TABLE; 3017 break; 3018 3019 /* 3020 * > Otherwise, switch the insertion mode to "in select". 3021 */ 3022 default: 3023 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_SELECT; 3024 break; 3025 } 3026 return true; 3027 3028 /* 3029 * > A start tag whose tag name is one of: "optgroup", "option" 3030 */ 3031 case '+OPTGROUP': 3032 case '+OPTION': 3033 if ( $this->state->stack_of_open_elements->current_node_is( 'OPTION' ) ) { 3034 $this->state->stack_of_open_elements->pop(); 3035 } 3036 $this->reconstruct_active_formatting_elements(); 3037 $this->insert_html_element( $this->state->current_token ); 3038 return true; 3039 3040 /* 3041 * > A start tag whose tag name is one of: "rb", "rtc" 3042 */ 3043 case '+RB': 3044 case '+RTC': 3045 if ( $this->state->stack_of_open_elements->has_element_in_scope( 'RUBY' ) ) { 3046 $this->generate_implied_end_tags(); 3047 3048 if ( $this->state->stack_of_open_elements->current_node_is( 'RUBY' ) ) { 3049 // @todo Indicate a parse error once it's possible. 3050 } 3051 } 3052 3053 $this->insert_html_element( $this->state->current_token ); 3054 return true; 3055 3056 /* 3057 * > A start tag whose tag name is one of: "rp", "rt" 3058 */ 3059 case '+RP': 3060 case '+RT': 3061 if ( $this->state->stack_of_open_elements->has_element_in_scope( 'RUBY' ) ) { 3062 $this->generate_implied_end_tags( 'RTC' ); 3063 3064 $current_node_name = $this->state->stack_of_open_elements->current_node()->node_name; 3065 if ( 'RTC' === $current_node_name || 'RUBY' === $current_node_name ) { 3066 // @todo Indicate a parse error once it's possible. 3067 } 3068 } 3069 3070 $this->insert_html_element( $this->state->current_token ); 3071 return true; 3072 3073 /* 3074 * > A start tag whose tag name is "math" 3075 */ 3076 case '+MATH': 3077 $this->reconstruct_active_formatting_elements(); 3078 3079 /* 3080 * @todo Adjust MathML attributes for the token. (This fixes the case of MathML attributes that are not all lowercase.) 3081 * @todo Adjust foreign attributes for the token. (This fixes the use of namespaced attributes, in particular XLink.) 3082 * 3083 * These ought to be handled in the attribute methods. 3084 */ 3085 $this->state->current_token->namespace = 'math'; 3086 $this->insert_html_element( $this->state->current_token ); 3087 if ( $this->state->current_token->has_self_closing_flag ) { 3088 $this->state->stack_of_open_elements->pop(); 3089 } 3090 return true; 3091 3092 /* 3093 * > A start tag whose tag name is "svg" 3094 */ 3095 case '+SVG': 3096 $this->reconstruct_active_formatting_elements(); 3097 3098 /* 3099 * @todo Adjust SVG attributes for the token. (This fixes the case of SVG attributes that are not all lowercase.) 3100 * @todo Adjust foreign attributes for the token. (This fixes the use of namespaced attributes, in particular XLink in SVG.) 3101 * 3102 * These ought to be handled in the attribute methods. 3103 */ 3104 $this->state->current_token->namespace = 'svg'; 3105 $this->insert_html_element( $this->state->current_token ); 3106 if ( $this->state->current_token->has_self_closing_flag ) { 3107 $this->state->stack_of_open_elements->pop(); 3108 } 3109 return true; 3110 3111 /* 3112 * > A start tag whose tag name is one of: "caption", "col", "colgroup", 3113 * > "frame", "head", "tbody", "td", "tfoot", "th", "thead", "tr" 3114 */ 3115 case '+CAPTION': 3116 case '+COL': 3117 case '+COLGROUP': 3118 case '+FRAME': 3119 case '+HEAD': 3120 case '+TBODY': 3121 case '+TD': 3122 case '+TFOOT': 3123 case '+TH': 3124 case '+THEAD': 3125 case '+TR': 3126 // Parse error. Ignore the token. 3127 return $this->step(); 3128 } 3129 3130 if ( ! parent::is_tag_closer() ) { 3131 /* 3132 * > Any other start tag 3133 */ 3134 $this->reconstruct_active_formatting_elements(); 3135 $this->insert_html_element( $this->state->current_token ); 3136 return true; 3137 } else { 3138 /* 3139 * > Any other end tag 3140 */ 3141 3142 /* 3143 * Find the corresponding tag opener in the stack of open elements, if 3144 * it exists before reaching a special element, which provides a kind 3145 * of boundary in the stack. For example, a `</custom-tag>` should not 3146 * close anything beyond its containing `P` or `DIV` element. 3147 */ 3148 foreach ( $this->state->stack_of_open_elements->walk_up() as $node ) { 3149 if ( 'html' === $node->namespace && $token_name === $node->node_name ) { 3150 break; 3151 } 3152 3153 if ( self::is_special( $node ) ) { 3154 // This is a parse error, ignore the token. 3155 return $this->step(); 3156 } 3157 } 3158 3159 $this->generate_implied_end_tags( $token_name ); 3160 if ( $node !== $this->state->stack_of_open_elements->current_node() ) { 3161 // @todo Record parse error: this error doesn't impact parsing. 3162 } 3163 3164 foreach ( $this->state->stack_of_open_elements->walk_up() as $item ) { 3165 $this->state->stack_of_open_elements->pop(); 3166 if ( $node === $item ) { 3167 return true; 3168 } 3169 } 3170 } 3171 3172 $this->bail( 'Should not have been able to reach end of IN BODY processing. Check HTML API code.' ); 3173 // This unnecessary return prevents tools from inaccurately reporting type errors. 3174 return false; 3175 } 3176 3177 /** 3178 * Parses next element in the 'in table' insertion mode. 3179 * 3180 * This internal function performs the 'in table' insertion mode 3181 * logic for the generalized WP_HTML_Processor::step() function. 3182 * 3183 * @since 6.7.0 3184 * 3185 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. 3186 * 3187 * @see https://html.spec.whatwg.org/#parsing-main-intable 3188 * @see WP_HTML_Processor::step 3189 * 3190 * @return bool Whether an element was found. 3191 */ 3192 private function step_in_table(): bool { 3193 $token_name = $this->get_token_name(); 3194 $token_type = $this->get_token_type(); 3195 $op_sigil = '#tag' === $token_type ? ( parent::is_tag_closer() ? '-' : '+' ) : ''; 3196 $op = "{$op_sigil}{$token_name}"; 3197 3198 switch ( $op ) { 3199 /* 3200 * > A character token, if the current node is table, 3201 * > tbody, template, tfoot, thead, or tr element 3202 */ 3203 case '#text': 3204 $current_node = $this->state->stack_of_open_elements->current_node(); 3205 $current_node_name = $current_node ? $current_node->node_name : null; 3206 if ( 3207 $current_node_name && ( 3208 'TABLE' === $current_node_name || 3209 'TBODY' === $current_node_name || 3210 'TEMPLATE' === $current_node_name || 3211 'TFOOT' === $current_node_name || 3212 'THEAD' === $current_node_name || 3213 'TR' === $current_node_name 3214 ) 3215 ) { 3216 /* 3217 * If the text is empty after processing HTML entities and stripping 3218 * U+0000 NULL bytes then ignore the token. 3219 */ 3220 if ( parent::TEXT_IS_NULL_SEQUENCE === $this->text_node_classification ) { 3221 return $this->step(); 3222 } 3223 3224 /* 3225 * This follows the rules for "in table text" insertion mode. 3226 * 3227 * Whitespace-only text nodes are inserted in-place. Otherwise 3228 * foster parenting is enabled and the nodes would be 3229 * inserted out-of-place. 3230 * 3231 * > If any of the tokens in the pending table character tokens 3232 * > list are character tokens that are not ASCII whitespace, 3233 * > then this is a parse error: reprocess the character tokens 3234 * > in the pending table character tokens list using the rules 3235 * > given in the "anything else" entry in the "in table" 3236 * > insertion mode. 3237 * > 3238 * > Otherwise, insert the characters given by the pending table 3239 * > character tokens list. 3240 * 3241 * @see https://html.spec.whatwg.org/#parsing-main-intabletext 3242 */ 3243 if ( parent::TEXT_IS_WHITESPACE === $this->text_node_classification ) { 3244 $this->insert_html_element( $this->state->current_token ); 3245 return true; 3246 } 3247 3248 // Non-whitespace would trigger fostering, unsupported at this time. 3249 $this->bail( 'Foster parenting is not supported.' ); 3250 break; 3251 } 3252 break; 3253 3254 /* 3255 * > A comment token 3256 */ 3257 case '#comment': 3258 case '#funky-comment': 3259 case '#presumptuous-tag': 3260 $this->insert_html_element( $this->state->current_token ); 3261 return true; 3262 3263 /* 3264 * > A DOCTYPE token 3265 */ 3266 case 'html': 3267 // Parse error: ignore the token. 3268 return $this->step(); 3269 3270 /* 3271 * > A start tag whose tag name is "caption" 3272 */ 3273 case '+CAPTION': 3274 $this->state->stack_of_open_elements->clear_to_table_context(); 3275 $this->state->active_formatting_elements->insert_marker(); 3276 $this->insert_html_element( $this->state->current_token ); 3277 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_CAPTION; 3278 return true; 3279 3280 /* 3281 * > A start tag whose tag name is "colgroup" 3282 */ 3283 case '+COLGROUP': 3284 $this->state->stack_of_open_elements->clear_to_table_context(); 3285 $this->insert_html_element( $this->state->current_token ); 3286 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_COLUMN_GROUP; 3287 return true; 3288 3289 /* 3290 * > A start tag whose tag name is "col" 3291 */ 3292 case '+COL': 3293 $this->state->stack_of_open_elements->clear_to_table_context(); 3294 3295 /* 3296 * > Insert an HTML element for a "colgroup" start tag token with no attributes, 3297 * > then switch the insertion mode to "in column group". 3298 */ 3299 $this->insert_virtual_node( 'COLGROUP' ); 3300 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_COLUMN_GROUP; 3301 return $this->step( self::REPROCESS_CURRENT_NODE ); 3302 3303 /* 3304 * > A start tag whose tag name is one of: "tbody", "tfoot", "thead" 3305 */ 3306 case '+TBODY': 3307 case '+TFOOT': 3308 case '+THEAD': 3309 $this->state->stack_of_open_elements->clear_to_table_context(); 3310 $this->insert_html_element( $this->state->current_token ); 3311 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE_BODY; 3312 return true; 3313 3314 /* 3315 * > A start tag whose tag name is one of: "td", "th", "tr" 3316 */ 3317 case '+TD': 3318 case '+TH': 3319 case '+TR': 3320 $this->state->stack_of_open_elements->clear_to_table_context(); 3321 /* 3322 * > Insert an HTML element for a "tbody" start tag token with no attributes, 3323 * > then switch the insertion mode to "in table body". 3324 */ 3325 $this->insert_virtual_node( 'TBODY' ); 3326 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE_BODY; 3327 return $this->step( self::REPROCESS_CURRENT_NODE ); 3328 3329 /* 3330 * > A start tag whose tag name is "table" 3331 * 3332 * This tag in the IN TABLE insertion mode is a parse error. 3333 */ 3334 case '+TABLE': 3335 if ( ! $this->state->stack_of_open_elements->has_element_in_table_scope( 'TABLE' ) ) { 3336 return $this->step(); 3337 } 3338 3339 $this->state->stack_of_open_elements->pop_until( 'TABLE' ); 3340 $this->reset_insertion_mode_appropriately(); 3341 return $this->step( self::REPROCESS_CURRENT_NODE ); 3342 3343 /* 3344 * > An end tag whose tag name is "table" 3345 */ 3346 case '-TABLE': 3347 if ( ! $this->state->stack_of_open_elements->has_element_in_table_scope( 'TABLE' ) ) { 3348 // @todo Indicate a parse error once it's possible. 3349 return $this->step(); 3350 } 3351 3352 $this->state->stack_of_open_elements->pop_until( 'TABLE' ); 3353 $this->reset_insertion_mode_appropriately(); 3354 return true; 3355 3356 /* 3357 * > An end tag whose tag name is one of: "body", "caption", "col", "colgroup", "html", "tbody", "td", "tfoot", "th", "thead", "tr" 3358 */ 3359 case '-BODY': 3360 case '-CAPTION': 3361 case '-COL': 3362 case '-COLGROUP': 3363 case '-HTML': 3364 case '-TBODY': 3365 case '-TD': 3366 case '-TFOOT': 3367 case '-TH': 3368 case '-THEAD': 3369 case '-TR': 3370 // Parse error: ignore the token. 3371 return $this->step(); 3372 3373 /* 3374 * > A start tag whose tag name is one of: "style", "script", "template" 3375 * > An end tag whose tag name is "template" 3376 */ 3377 case '+STYLE': 3378 case '+SCRIPT': 3379 case '+TEMPLATE': 3380 case '-TEMPLATE': 3381 /* 3382 * > Process the token using the rules for the "in head" insertion mode. 3383 */ 3384 return $this->step_in_head(); 3385 3386 /* 3387 * > A start tag whose tag name is "input" 3388 * 3389 * > If the token does not have an attribute with the name "type", or if it does, but 3390 * > that attribute's value is not an ASCII case-insensitive match for the string 3391 * > "hidden", then: act as described in the "anything else" entry below. 3392 */ 3393 case '+INPUT': 3394 $type_attribute = $this->get_attribute( 'type' ); 3395 if ( ! is_string( $type_attribute ) || 'hidden' !== strtolower( $type_attribute ) ) { 3396 goto anything_else; 3397 } 3398 // @todo Indicate a parse error once it's possible. 3399 $this->insert_html_element( $this->state->current_token ); 3400 return true; 3401 3402 /* 3403 * > A start tag whose tag name is "form" 3404 * 3405 * This tag in the IN TABLE insertion mode is a parse error. 3406 */ 3407 case '+FORM': 3408 if ( 3409 $this->state->stack_of_open_elements->has_element_in_scope( 'TEMPLATE' ) || 3410 isset( $this->state->form_element ) 3411 ) { 3412 return $this->step(); 3413 } 3414 3415 // This FORM is special because it immediately closes and cannot have other children. 3416 $this->insert_html_element( $this->state->current_token ); 3417 $this->state->form_element = $this->state->current_token; 3418 $this->state->stack_of_open_elements->pop(); 3419 return true; 3420 } 3421 3422 /* 3423 * > Anything else 3424 * > Parse error. Enable foster parenting, process the token using the rules for the 3425 * > "in body" insertion mode, and then disable foster parenting. 3426 * 3427 * @todo Indicate a parse error once it's possible. 3428 */ 3429 anything_else: 3430 $this->bail( 'Foster parenting is not supported.' ); 3431 } 3432 3433 /** 3434 * Parses next element in the 'in table text' insertion mode. 3435 * 3436 * This internal function performs the 'in table text' insertion mode 3437 * logic for the generalized WP_HTML_Processor::step() function. 3438 * 3439 * @since 6.7.0 Stub implementation. 3440 * 3441 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. 3442 * 3443 * @see https://html.spec.whatwg.org/#parsing-main-intabletext 3444 * @see WP_HTML_Processor::step 3445 * 3446 * @return bool Whether an element was found. 3447 */ 3448 private function step_in_table_text(): bool { 3449 $this->bail( 'No support for parsing in the ' . WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE_TEXT . ' state.' ); 3450 } 3451 3452 /** 3453 * Parses next element in the 'in caption' insertion mode. 3454 * 3455 * This internal function performs the 'in caption' insertion mode 3456 * logic for the generalized WP_HTML_Processor::step() function. 3457 * 3458 * @since 6.7.0 3459 * 3460 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. 3461 * 3462 * @see https://html.spec.whatwg.org/#parsing-main-incaption 3463 * @see WP_HTML_Processor::step 3464 * 3465 * @return bool Whether an element was found. 3466 */ 3467 private function step_in_caption(): bool { 3468 $tag_name = $this->get_tag(); 3469 $op_sigil = $this->is_tag_closer() ? '-' : '+'; 3470 $op = "{$op_sigil}{$tag_name}"; 3471 3472 switch ( $op ) { 3473 /* 3474 * > An end tag whose tag name is "caption" 3475 * > A start tag whose tag name is one of: "caption", "col", "colgroup", "tbody", "td", "tfoot", "th", "thead", "tr" 3476 * > An end tag whose tag name is "table" 3477 * 3478 * These tag handling rules are identical except for the final instruction. 3479 * Handle them in a single block. 3480 */ 3481 case '-CAPTION': 3482 case '+CAPTION': 3483 case '+COL': 3484 case '+COLGROUP': 3485 case '+TBODY': 3486 case '+TD': 3487 case '+TFOOT': 3488 case '+TH': 3489 case '+THEAD': 3490 case '+TR': 3491 case '-TABLE': 3492 if ( ! $this->state->stack_of_open_elements->has_element_in_table_scope( 'CAPTION' ) ) { 3493 // Parse error: ignore the token. 3494 return $this->step(); 3495 } 3496 3497 $this->generate_implied_end_tags(); 3498 if ( ! $this->state->stack_of_open_elements->current_node_is( 'CAPTION' ) ) { 3499 // @todo Indicate a parse error once it's possible. 3500 } 3501 3502 $this->state->stack_of_open_elements->pop_until( 'CAPTION' ); 3503 $this->state->active_formatting_elements->clear_up_to_last_marker(); 3504 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE; 3505 3506 // If this is not a CAPTION end tag, the token should be reprocessed. 3507 if ( '-CAPTION' === $op ) { 3508 return true; 3509 } 3510 return $this->step( self::REPROCESS_CURRENT_NODE ); 3511 3512 /** 3513 * > An end tag whose tag name is one of: "body", "col", "colgroup", "html", "tbody", "td", "tfoot", "th", "thead", "tr" 3514 */ 3515 case '-BODY': 3516 case '-COL': 3517 case '-COLGROUP': 3518 case '-HTML': 3519 case '-TBODY': 3520 case '-TD': 3521 case '-TFOOT': 3522 case '-TH': 3523 case '-THEAD': 3524 case '-TR': 3525 // Parse error: ignore the token. 3526 return $this->step(); 3527 } 3528 3529 /** 3530 * > Anything else 3531 * > Process the token using the rules for the "in body" insertion mode. 3532 */ 3533 return $this->step_in_body(); 3534 } 3535 3536 /** 3537 * Parses next element in the 'in column group' insertion mode. 3538 * 3539 * This internal function performs the 'in column group' insertion mode 3540 * logic for the generalized WP_HTML_Processor::step() function. 3541 * 3542 * @since 6.7.0 3543 * 3544 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. 3545 * 3546 * @see https://html.spec.whatwg.org/#parsing-main-incolgroup 3547 * @see WP_HTML_Processor::step 3548 * 3549 * @return bool Whether an element was found. 3550 */ 3551 private function step_in_column_group(): bool { 3552 $token_name = $this->get_token_name(); 3553 $token_type = $this->get_token_type(); 3554 $op_sigil = '#tag' === $token_type ? ( parent::is_tag_closer() ? '-' : '+' ) : ''; 3555 $op = "{$op_sigil}{$token_name}"; 3556 3557 switch ( $op ) { 3558 /* 3559 * > A character token that is one of U+0009 CHARACTER TABULATION, U+000A LINE FEED (LF), 3560 * > U+000C FORM FEED (FF), U+000D CARRIAGE RETURN (CR), or U+0020 SPACE 3561 */ 3562 case '#text': 3563 if ( parent::TEXT_IS_WHITESPACE === $this->text_node_classification ) { 3564 // Insert the character. 3565 $this->insert_html_element( $this->state->current_token ); 3566 return true; 3567 } 3568 3569 goto in_column_group_anything_else; 3570 break; 3571 3572 /* 3573 * > A comment token 3574 */ 3575 case '#comment': 3576 case '#funky-comment': 3577 case '#presumptuous-tag': 3578 $this->insert_html_element( $this->state->current_token ); 3579 return true; 3580 3581 /* 3582 * > A DOCTYPE token 3583 */ 3584 case 'html': 3585 // @todo Indicate a parse error once it's possible. 3586 return $this->step(); 3587 3588 /* 3589 * > A start tag whose tag name is "html" 3590 */ 3591 case '+HTML': 3592 return $this->step_in_body(); 3593 3594 /* 3595 * > A start tag whose tag name is "col" 3596 */ 3597 case '+COL': 3598 $this->insert_html_element( $this->state->current_token ); 3599 $this->state->stack_of_open_elements->pop(); 3600 return true; 3601 3602 /* 3603 * > An end tag whose tag name is "colgroup" 3604 */ 3605 case '-COLGROUP': 3606 if ( ! $this->state->stack_of_open_elements->current_node_is( 'COLGROUP' ) ) { 3607 // @todo Indicate a parse error once it's possible. 3608 return $this->step(); 3609 } 3610 $this->state->stack_of_open_elements->pop(); 3611 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE; 3612 return true; 3613 3614 /* 3615 * > An end tag whose tag name is "col" 3616 */ 3617 case '-COL': 3618 // Parse error: ignore the token. 3619 return $this->step(); 3620 3621 /* 3622 * > A start tag whose tag name is "template" 3623 * > An end tag whose tag name is "template" 3624 */ 3625 case '+TEMPLATE': 3626 case '-TEMPLATE': 3627 return $this->step_in_head(); 3628 } 3629 3630 in_column_group_anything_else: 3631 /* 3632 * > Anything else 3633 */ 3634 if ( ! $this->state->stack_of_open_elements->current_node_is( 'COLGROUP' ) ) { 3635 // @todo Indicate a parse error once it's possible. 3636 return $this->step(); 3637 } 3638 $this->state->stack_of_open_elements->pop(); 3639 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE; 3640 return $this->step( self::REPROCESS_CURRENT_NODE ); 3641 } 3642 3643 /** 3644 * Parses next element in the 'in table body' insertion mode. 3645 * 3646 * This internal function performs the 'in table body' insertion mode 3647 * logic for the generalized WP_HTML_Processor::step() function. 3648 * 3649 * @since 6.7.0 3650 * 3651 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. 3652 * 3653 * @see https://html.spec.whatwg.org/#parsing-main-intbody 3654 * @see WP_HTML_Processor::step 3655 * 3656 * @return bool Whether an element was found. 3657 */ 3658 private function step_in_table_body(): bool { 3659 $tag_name = $this->get_tag(); 3660 $op_sigil = $this->is_tag_closer() ? '-' : '+'; 3661 $op = "{$op_sigil}{$tag_name}"; 3662 3663 switch ( $op ) { 3664 /* 3665 * > A start tag whose tag name is "tr" 3666 */ 3667 case '+TR': 3668 $this->state->stack_of_open_elements->clear_to_table_body_context(); 3669 $this->insert_html_element( $this->state->current_token ); 3670 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_ROW; 3671 return true; 3672 3673 /* 3674 * > A start tag whose tag name is one of: "th", "td" 3675 */ 3676 case '+TH': 3677 case '+TD': 3678 // @todo Indicate a parse error once it's possible. 3679 $this->state->stack_of_open_elements->clear_to_table_body_context(); 3680 $this->insert_virtual_node( 'TR' ); 3681 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_ROW; 3682 return $this->step( self::REPROCESS_CURRENT_NODE ); 3683 3684 /* 3685 * > An end tag whose tag name is one of: "tbody", "tfoot", "thead" 3686 */ 3687 case '-TBODY': 3688 case '-TFOOT': 3689 case '-THEAD': 3690 if ( ! $this->state->stack_of_open_elements->has_element_in_table_scope( $tag_name ) ) { 3691 // Parse error: ignore the token. 3692 return $this->step(); 3693 } 3694 3695 $this->state->stack_of_open_elements->clear_to_table_body_context(); 3696 $this->state->stack_of_open_elements->pop(); 3697 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE; 3698 return true; 3699 3700 /* 3701 * > A start tag whose tag name is one of: "caption", "col", "colgroup", "tbody", "tfoot", "thead" 3702 * > An end tag whose tag name is "table" 3703 */ 3704 case '+CAPTION': 3705 case '+COL': 3706 case '+COLGROUP': 3707 case '+TBODY': 3708 case '+TFOOT': 3709 case '+THEAD': 3710 case '-TABLE': 3711 if ( 3712 ! $this->state->stack_of_open_elements->has_element_in_table_scope( 'TBODY' ) && 3713 ! $this->state->stack_of_open_elements->has_element_in_table_scope( 'THEAD' ) && 3714 ! $this->state->stack_of_open_elements->has_element_in_table_scope( 'TFOOT' ) 3715 ) { 3716 // Parse error: ignore the token. 3717 return $this->step(); 3718 } 3719 $this->state->stack_of_open_elements->clear_to_table_body_context(); 3720 $this->state->stack_of_open_elements->pop(); 3721 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE; 3722 return $this->step( self::REPROCESS_CURRENT_NODE ); 3723 3724 /* 3725 * > An end tag whose tag name is one of: "body", "caption", "col", "colgroup", "html", "td", "th", "tr" 3726 */ 3727 case '-BODY': 3728 case '-CAPTION': 3729 case '-COL': 3730 case '-COLGROUP': 3731 case '-HTML': 3732 case '-TD': 3733 case '-TH': 3734 case '-TR': 3735 // Parse error: ignore the token. 3736 return $this->step(); 3737 } 3738 3739 /* 3740 * > Anything else 3741 * > Process the token using the rules for the "in table" insertion mode. 3742 */ 3743 return $this->step_in_table(); 3744 } 3745 3746 /** 3747 * Parses next element in the 'in row' insertion mode. 3748 * 3749 * This internal function performs the 'in row' insertion mode 3750 * logic for the generalized WP_HTML_Processor::step() function. 3751 * 3752 * @since 6.7.0 3753 * 3754 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. 3755 * 3756 * @see https://html.spec.whatwg.org/#parsing-main-intr 3757 * @see WP_HTML_Processor::step 3758 * 3759 * @return bool Whether an element was found. 3760 */ 3761 private function step_in_row(): bool { 3762 $tag_name = $this->get_tag(); 3763 $op_sigil = $this->is_tag_closer() ? '-' : '+'; 3764 $op = "{$op_sigil}{$tag_name}"; 3765 3766 switch ( $op ) { 3767 /* 3768 * > A start tag whose tag name is one of: "th", "td" 3769 */ 3770 case '+TH': 3771 case '+TD': 3772 $this->state->stack_of_open_elements->clear_to_table_row_context(); 3773 $this->insert_html_element( $this->state->current_token ); 3774 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_CELL; 3775 $this->state->active_formatting_elements->insert_marker(); 3776 return true; 3777 3778 /* 3779 * > An end tag whose tag name is "tr" 3780 */ 3781 case '-TR': 3782 if ( ! $this->state->stack_of_open_elements->has_element_in_table_scope( 'TR' ) ) { 3783 // Parse error: ignore the token. 3784 return $this->step(); 3785 } 3786 3787 $this->state->stack_of_open_elements->clear_to_table_row_context(); 3788 $this->state->stack_of_open_elements->pop(); 3789 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE_BODY; 3790 return true; 3791 3792 /* 3793 * > A start tag whose tag name is one of: "caption", "col", "colgroup", "tbody", "tfoot", "thead", "tr" 3794 * > An end tag whose tag name is "table" 3795 */ 3796 case '+CAPTION': 3797 case '+COL': 3798 case '+COLGROUP': 3799 case '+TBODY': 3800 case '+TFOOT': 3801 case '+THEAD': 3802 case '+TR': 3803 case '-TABLE': 3804 if ( ! $this->state->stack_of_open_elements->has_element_in_table_scope( 'TR' ) ) { 3805 // Parse error: ignore the token. 3806 return $this->step(); 3807 } 3808 3809 $this->state->stack_of_open_elements->clear_to_table_row_context(); 3810 $this->state->stack_of_open_elements->pop(); 3811 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE_BODY; 3812 return $this->step( self::REPROCESS_CURRENT_NODE ); 3813 3814 /* 3815 * > An end tag whose tag name is one of: "tbody", "tfoot", "thead" 3816 */ 3817 case '-TBODY': 3818 case '-TFOOT': 3819 case '-THEAD': 3820 if ( ! $this->state->stack_of_open_elements->has_element_in_table_scope( $tag_name ) ) { 3821 // Parse error: ignore the token. 3822 return $this->step(); 3823 } 3824 3825 if ( ! $this->state->stack_of_open_elements->has_element_in_table_scope( 'TR' ) ) { 3826 // Ignore the token. 3827 return $this->step(); 3828 } 3829 3830 $this->state->stack_of_open_elements->clear_to_table_row_context(); 3831 $this->state->stack_of_open_elements->pop(); 3832 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE_BODY; 3833 return $this->step( self::REPROCESS_CURRENT_NODE ); 3834 3835 /* 3836 * > An end tag whose tag name is one of: "body", "caption", "col", "colgroup", "html", "td", "th" 3837 */ 3838 case '-BODY': 3839 case '-CAPTION': 3840 case '-COL': 3841 case '-COLGROUP': 3842 case '-HTML': 3843 case '-TD': 3844 case '-TH': 3845 // Parse error: ignore the token. 3846 return $this->step(); 3847 } 3848 3849 /* 3850 * > Anything else 3851 * > Process the token using the rules for the "in table" insertion mode. 3852 */ 3853 return $this->step_in_table(); 3854 } 3855 3856 /** 3857 * Parses next element in the 'in cell' insertion mode. 3858 * 3859 * This internal function performs the 'in cell' insertion mode 3860 * logic for the generalized WP_HTML_Processor::step() function. 3861 * 3862 * @since 6.7.0 3863 * 3864 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. 3865 * 3866 * @see https://html.spec.whatwg.org/#parsing-main-intd 3867 * @see WP_HTML_Processor::step 3868 * 3869 * @return bool Whether an element was found. 3870 */ 3871 private function step_in_cell(): bool { 3872 $tag_name = $this->get_tag(); 3873 $op_sigil = $this->is_tag_closer() ? '-' : '+'; 3874 $op = "{$op_sigil}{$tag_name}"; 3875 3876 switch ( $op ) { 3877 /* 3878 * > An end tag whose tag name is one of: "td", "th" 3879 */ 3880 case '-TD': 3881 case '-TH': 3882 if ( ! $this->state->stack_of_open_elements->has_element_in_table_scope( $tag_name ) ) { 3883 // Parse error: ignore the token. 3884 return $this->step(); 3885 } 3886 3887 $this->generate_implied_end_tags(); 3888 3889 /* 3890 * @todo This needs to check if the current node is an HTML element, meaning that 3891 * when SVG and MathML support is added, this needs to differentiate between an 3892 * HTML element of the given name, such as `<center>`, and a foreign element of 3893 * the same given name. 3894 */ 3895 if ( ! $this->state->stack_of_open_elements->current_node_is( $tag_name ) ) { 3896 // @todo Indicate a parse error once it's possible. 3897 } 3898 3899 $this->state->stack_of_open_elements->pop_until( $tag_name ); 3900 $this->state->active_formatting_elements->clear_up_to_last_marker(); 3901 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_ROW; 3902 return true; 3903 3904 /* 3905 * > A start tag whose tag name is one of: "caption", "col", "colgroup", "tbody", "td", 3906 * > "tfoot", "th", "thead", "tr" 3907 */ 3908 case '+CAPTION': 3909 case '+COL': 3910 case '+COLGROUP': 3911 case '+TBODY': 3912 case '+TD': 3913 case '+TFOOT': 3914 case '+TH': 3915 case '+THEAD': 3916 case '+TR': 3917 /* 3918 * > Assert: The stack of open elements has a td or th element in table scope. 3919 * 3920 * Nothing to do here, except to verify in tests that this never appears. 3921 */ 3922 3923 $this->close_cell(); 3924 return $this->step( self::REPROCESS_CURRENT_NODE ); 3925 3926 /* 3927 * > An end tag whose tag name is one of: "body", "caption", "col", "colgroup", "html" 3928 */ 3929 case '-BODY': 3930 case '-CAPTION': 3931 case '-COL': 3932 case '-COLGROUP': 3933 case '-HTML': 3934 // Parse error: ignore the token. 3935 return $this->step(); 3936 3937 /* 3938 * > An end tag whose tag name is one of: "table", "tbody", "tfoot", "thead", "tr" 3939 */ 3940 case '-TABLE': 3941 case '-TBODY': 3942 case '-TFOOT': 3943 case '-THEAD': 3944 case '-TR': 3945 if ( ! $this->state->stack_of_open_elements->has_element_in_table_scope( $tag_name ) ) { 3946 // Parse error: ignore the token. 3947 return $this->step(); 3948 } 3949 $this->close_cell(); 3950 return $this->step( self::REPROCESS_CURRENT_NODE ); 3951 } 3952 3953 /* 3954 * > Anything else 3955 * > Process the token using the rules for the "in body" insertion mode. 3956 */ 3957 return $this->step_in_body(); 3958 } 3959 3960 /** 3961 * Parses next element in the 'in select' insertion mode. 3962 * 3963 * This internal function performs the 'in select' insertion mode 3964 * logic for the generalized WP_HTML_Processor::step() function. 3965 * 3966 * @since 6.7.0 3967 * 3968 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. 3969 * 3970 * @see https://html.spec.whatwg.org/multipage/parsing.html#parsing-main-inselect 3971 * @see WP_HTML_Processor::step 3972 * 3973 * @return bool Whether an element was found. 3974 */ 3975 private function step_in_select(): bool { 3976 $token_name = $this->get_token_name(); 3977 $token_type = $this->get_token_type(); 3978 $op_sigil = '#tag' === $token_type ? ( parent::is_tag_closer() ? '-' : '+' ) : ''; 3979 $op = "{$op_sigil}{$token_name}"; 3980 3981 switch ( $op ) { 3982 /* 3983 * > Any other character token 3984 */ 3985 case '#text': 3986 /* 3987 * > A character token that is U+0000 NULL 3988 * 3989 * If a text node only comprises null bytes then it should be 3990 * entirely ignored and should not return to calling code. 3991 */ 3992 if ( parent::TEXT_IS_NULL_SEQUENCE === $this->text_node_classification ) { 3993 // Parse error: ignore the token. 3994 return $this->step(); 3995 } 3996 3997 $this->insert_html_element( $this->state->current_token ); 3998 return true; 3999 4000 /* 4001 * > A comment token 4002 */ 4003 case '#comment': 4004 case '#funky-comment': 4005 case '#presumptuous-tag': 4006 $this->insert_html_element( $this->state->current_token ); 4007 return true; 4008 4009 /* 4010 * > A DOCTYPE token 4011 */ 4012 case 'html': 4013 // Parse error: ignore the token. 4014 return $this->step(); 4015 4016 /* 4017 * > A start tag whose tag name is "html" 4018 */ 4019 case '+HTML': 4020 return $this->step_in_body(); 4021 4022 /* 4023 * > A start tag whose tag name is "option" 4024 */ 4025 case '+OPTION': 4026 if ( $this->state->stack_of_open_elements->current_node_is( 'OPTION' ) ) { 4027 $this->state->stack_of_open_elements->pop(); 4028 } 4029 $this->insert_html_element( $this->state->current_token ); 4030 return true; 4031 4032 /* 4033 * > A start tag whose tag name is "optgroup" 4034 * > A start tag whose tag name is "hr" 4035 * 4036 * These rules are identical except for the treatment of the self-closing flag and 4037 * the subsequent pop of the HR void element, all of which is handled elsewhere in the processor. 4038 */ 4039 case '+OPTGROUP': 4040 case '+HR': 4041 if ( $this->state->stack_of_open_elements->current_node_is( 'OPTION' ) ) { 4042 $this->state->stack_of_open_elements->pop(); 4043 } 4044 4045 if ( $this->state->stack_of_open_elements->current_node_is( 'OPTGROUP' ) ) { 4046 $this->state->stack_of_open_elements->pop(); 4047 } 4048 4049 $this->insert_html_element( $this->state->current_token ); 4050 return true; 4051 4052 /* 4053 * > An end tag whose tag name is "optgroup" 4054 */ 4055 case '-OPTGROUP': 4056 $current_node = $this->state->stack_of_open_elements->current_node(); 4057 if ( $current_node && 'OPTION' === $current_node->node_name ) { 4058 foreach ( $this->state->stack_of_open_elements->walk_up( $current_node ) as $parent ) { 4059 break; 4060 } 4061 if ( $parent && 'OPTGROUP' === $parent->node_name ) { 4062 $this->state->stack_of_open_elements->pop(); 4063 } 4064 } 4065 4066 if ( $this->state->stack_of_open_elements->current_node_is( 'OPTGROUP' ) ) { 4067 $this->state->stack_of_open_elements->pop(); 4068 return true; 4069 } 4070 4071 // Parse error: ignore the token. 4072 return $this->step(); 4073 4074 /* 4075 * > An end tag whose tag name is "option" 4076 */ 4077 case '-OPTION': 4078 if ( $this->state->stack_of_open_elements->current_node_is( 'OPTION' ) ) { 4079 $this->state->stack_of_open_elements->pop(); 4080 return true; 4081 } 4082 4083 // Parse error: ignore the token. 4084 return $this->step(); 4085 4086 /* 4087 * > An end tag whose tag name is "select" 4088 * > A start tag whose tag name is "select" 4089 * 4090 * > It just gets treated like an end tag. 4091 */ 4092 case '-SELECT': 4093 case '+SELECT': 4094 if ( ! $this->state->stack_of_open_elements->has_element_in_select_scope( 'SELECT' ) ) { 4095 // Parse error: ignore the token. 4096 return $this->step(); 4097 } 4098 $this->state->stack_of_open_elements->pop_until( 'SELECT' ); 4099 $this->reset_insertion_mode_appropriately(); 4100 return true; 4101 4102 /* 4103 * > A start tag whose tag name is one of: "input", "keygen", "textarea" 4104 * 4105 * All three of these tags are considered a parse error when found in this insertion mode. 4106 */ 4107 case '+INPUT': 4108 case '+KEYGEN': 4109 case '+TEXTAREA': 4110 if ( ! $this->state->stack_of_open_elements->has_element_in_select_scope( 'SELECT' ) ) { 4111 // Ignore the token. 4112 return $this->step(); 4113 } 4114 $this->state->stack_of_open_elements->pop_until( 'SELECT' ); 4115 $this->reset_insertion_mode_appropriately(); 4116 return $this->step( self::REPROCESS_CURRENT_NODE ); 4117 4118 /* 4119 * > A start tag whose tag name is one of: "script", "template" 4120 * > An end tag whose tag name is "template" 4121 */ 4122 case '+SCRIPT': 4123 case '+TEMPLATE': 4124 case '-TEMPLATE': 4125 return $this->step_in_head(); 4126 } 4127 4128 /* 4129 * > Anything else 4130 * > Parse error: ignore the token. 4131 */ 4132 return $this->step(); 4133 } 4134 4135 /** 4136 * Parses next element in the 'in select in table' insertion mode. 4137 * 4138 * This internal function performs the 'in select in table' insertion mode 4139 * logic for the generalized WP_HTML_Processor::step() function. 4140 * 4141 * @since 6.7.0 4142 * 4143 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. 4144 * 4145 * @see https://html.spec.whatwg.org/#parsing-main-inselectintable 4146 * @see WP_HTML_Processor::step 4147 * 4148 * @return bool Whether an element was found. 4149 */ 4150 private function step_in_select_in_table(): bool { 4151 $token_name = $this->get_token_name(); 4152 $token_type = $this->get_token_type(); 4153 $op_sigil = '#tag' === $token_type ? ( parent::is_tag_closer() ? '-' : '+' ) : ''; 4154 $op = "{$op_sigil}{$token_name}"; 4155 4156 switch ( $op ) { 4157 /* 4158 * > A start tag whose tag name is one of: "caption", "table", "tbody", "tfoot", "thead", "tr", "td", "th" 4159 */ 4160 case '+CAPTION': 4161 case '+TABLE': 4162 case '+TBODY': 4163 case '+TFOOT': 4164 case '+THEAD': 4165 case '+TR': 4166 case '+TD': 4167 case '+TH': 4168 // @todo Indicate a parse error once it's possible. 4169 $this->state->stack_of_open_elements->pop_until( 'SELECT' ); 4170 $this->reset_insertion_mode_appropriately(); 4171 return $this->step( self::REPROCESS_CURRENT_NODE ); 4172 4173 /* 4174 * > An end tag whose tag name is one of: "caption", "table", "tbody", "tfoot", "thead", "tr", "td", "th" 4175 */ 4176 case '-CAPTION': 4177 case '-TABLE': 4178 case '-TBODY': 4179 case '-TFOOT': 4180 case '-THEAD': 4181 case '-TR': 4182 case '-TD': 4183 case '-TH': 4184 // @todo Indicate a parse error once it's possible. 4185 if ( ! $this->state->stack_of_open_elements->has_element_in_table_scope( $token_name ) ) { 4186 return $this->step(); 4187 } 4188 $this->state->stack_of_open_elements->pop_until( 'SELECT' ); 4189 $this->reset_insertion_mode_appropriately(); 4190 return $this->step( self::REPROCESS_CURRENT_NODE ); 4191 } 4192 4193 /* 4194 * > Anything else 4195 */ 4196 return $this->step_in_select(); 4197 } 4198 4199 /** 4200 * Parses next element in the 'in template' insertion mode. 4201 * 4202 * This internal function performs the 'in template' insertion mode 4203 * logic for the generalized WP_HTML_Processor::step() function. 4204 * 4205 * @since 6.7.0 Stub implementation. 4206 * 4207 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. 4208 * 4209 * @see https://html.spec.whatwg.org/#parsing-main-intemplate 4210 * @see WP_HTML_Processor::step 4211 * 4212 * @return bool Whether an element was found. 4213 */ 4214 private function step_in_template(): bool { 4215 $token_name = $this->get_token_name(); 4216 $token_type = $this->get_token_type(); 4217 $is_closer = $this->is_tag_closer(); 4218 $op_sigil = '#tag' === $token_type ? ( $is_closer ? '-' : '+' ) : ''; 4219 $op = "{$op_sigil}{$token_name}"; 4220 4221 switch ( $op ) { 4222 /* 4223 * > A character token 4224 * > A comment token 4225 * > A DOCTYPE token 4226 */ 4227 case '#text': 4228 case '#comment': 4229 case '#funky-comment': 4230 case '#presumptuous-tag': 4231 case 'html': 4232 return $this->step_in_body(); 4233 4234 /* 4235 * > A start tag whose tag name is one of: "base", "basefont", "bgsound", "link", 4236 * > "meta", "noframes", "script", "style", "template", "title" 4237 * > An end tag whose tag name is "template" 4238 */ 4239 case '+BASE': 4240 case '+BASEFONT': 4241 case '+BGSOUND': 4242 case '+LINK': 4243 case '+META': 4244 case '+NOFRAMES': 4245 case '+SCRIPT': 4246 case '+STYLE': 4247 case '+TEMPLATE': 4248 case '+TITLE': 4249 case '-TEMPLATE': 4250 return $this->step_in_head(); 4251 4252 /* 4253 * > A start tag whose tag name is one of: "caption", "colgroup", "tbody", "tfoot", "thead" 4254 */ 4255 case '+CAPTION': 4256 case '+COLGROUP': 4257 case '+TBODY': 4258 case '+TFOOT': 4259 case '+THEAD': 4260 array_pop( $this->state->stack_of_template_insertion_modes ); 4261 $this->state->stack_of_template_insertion_modes[] = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE; 4262 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE; 4263 return $this->step( self::REPROCESS_CURRENT_NODE ); 4264 4265 /* 4266 * > A start tag whose tag name is "col" 4267 */ 4268 case '+COL': 4269 array_pop( $this->state->stack_of_template_insertion_modes ); 4270 $this->state->stack_of_template_insertion_modes[] = WP_HTML_Processor_State::INSERTION_MODE_IN_COLUMN_GROUP; 4271 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_COLUMN_GROUP; 4272 return $this->step( self::REPROCESS_CURRENT_NODE ); 4273 4274 /* 4275 * > A start tag whose tag name is "tr" 4276 */ 4277 case '+TR': 4278 array_pop( $this->state->stack_of_template_insertion_modes ); 4279 $this->state->stack_of_template_insertion_modes[] = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE_BODY; 4280 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE_BODY; 4281 return $this->step( self::REPROCESS_CURRENT_NODE ); 4282 4283 /* 4284 * > A start tag whose tag name is one of: "td", "th" 4285 */ 4286 case '+TD': 4287 case '+TH': 4288 array_pop( $this->state->stack_of_template_insertion_modes ); 4289 $this->state->stack_of_template_insertion_modes[] = WP_HTML_Processor_State::INSERTION_MODE_IN_ROW; 4290 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_ROW; 4291 return $this->step( self::REPROCESS_CURRENT_NODE ); 4292 } 4293 4294 /* 4295 * > Any other start tag 4296 */ 4297 if ( ! $is_closer ) { 4298 array_pop( $this->state->stack_of_template_insertion_modes ); 4299 $this->state->stack_of_template_insertion_modes[] = WP_HTML_Processor_State::INSERTION_MODE_IN_BODY; 4300 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_BODY; 4301 return $this->step( self::REPROCESS_CURRENT_NODE ); 4302 } 4303 4304 /* 4305 * > Any other end tag 4306 */ 4307 if ( $is_closer ) { 4308 // Parse error: ignore the token. 4309 return $this->step(); 4310 } 4311 4312 /* 4313 * > An end-of-file token 4314 */ 4315 if ( ! $this->state->stack_of_open_elements->contains( 'TEMPLATE' ) ) { 4316 // Stop parsing. 4317 return false; 4318 } 4319 4320 // @todo Indicate a parse error once it's possible. 4321 $this->state->stack_of_open_elements->pop_until( 'TEMPLATE' ); 4322 $this->state->active_formatting_elements->clear_up_to_last_marker(); 4323 array_pop( $this->state->stack_of_template_insertion_modes ); 4324 $this->reset_insertion_mode_appropriately(); 4325 return $this->step( self::REPROCESS_CURRENT_NODE ); 4326 } 4327 4328 /** 4329 * Parses next element in the 'after body' insertion mode. 4330 * 4331 * This internal function performs the 'after body' insertion mode 4332 * logic for the generalized WP_HTML_Processor::step() function. 4333 * 4334 * @since 6.7.0 Stub implementation. 4335 * 4336 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. 4337 * 4338 * @see https://html.spec.whatwg.org/#parsing-main-afterbody 4339 * @see WP_HTML_Processor::step 4340 * 4341 * @return bool Whether an element was found. 4342 */ 4343 private function step_after_body(): bool { 4344 $tag_name = $this->get_token_name(); 4345 $token_type = $this->get_token_type(); 4346 $op_sigil = '#tag' === $token_type ? ( $this->is_tag_closer() ? '-' : '+' ) : ''; 4347 $op = "{$op_sigil}{$tag_name}"; 4348 4349 switch ( $op ) { 4350 /* 4351 * > A character token that is one of U+0009 CHARACTER TABULATION, U+000A LINE FEED (LF), 4352 * > U+000C FORM FEED (FF), U+000D CARRIAGE RETURN (CR), or U+0020 SPACE 4353 * 4354 * > Process the token using the rules for the "in body" insertion mode. 4355 */ 4356 case '#text': 4357 if ( parent::TEXT_IS_WHITESPACE === $this->text_node_classification ) { 4358 return $this->step_in_body(); 4359 } 4360 goto after_body_anything_else; 4361 break; 4362 4363 /* 4364 * > A comment token 4365 */ 4366 case '#comment': 4367 case '#funky-comment': 4368 case '#presumptuous-tag': 4369 $this->bail( 'Content outside of BODY is unsupported.' ); 4370 break; 4371 4372 /* 4373 * > A DOCTYPE token 4374 */ 4375 case 'html': 4376 // Parse error: ignore the token. 4377 return $this->step(); 4378 4379 /* 4380 * > A start tag whose tag name is "html" 4381 */ 4382 case '+HTML': 4383 return $this->step_in_body(); 4384 4385 /* 4386 * > An end tag whose tag name is "html" 4387 * 4388 * > If the parser was created as part of the HTML fragment parsing algorithm, 4389 * > this is a parse error; ignore the token. (fragment case) 4390 * > 4391 * > Otherwise, switch the insertion mode to "after after body". 4392 */ 4393 case '-HTML': 4394 if ( isset( $this->context_node ) ) { 4395 return $this->step(); 4396 } 4397 4398 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_AFTER_AFTER_BODY; 4399 /* 4400 * The HTML element is not removed from the stack of open elements. 4401 * Only internal state has changed, this does not qualify as a "step" 4402 * in terms of advancing through the document to another token. 4403 * Nothing has been pushed or popped. 4404 * Proceed to parse the next item. 4405 */ 4406 return $this->step(); 4407 } 4408 4409 /* 4410 * > Parse error. Switch the insertion mode to "in body" and reprocess the token. 4411 */ 4412 after_body_anything_else: 4413 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_BODY; 4414 return $this->step( self::REPROCESS_CURRENT_NODE ); 4415 } 4416 4417 /** 4418 * Parses next element in the 'in frameset' insertion mode. 4419 * 4420 * This internal function performs the 'in frameset' insertion mode 4421 * logic for the generalized WP_HTML_Processor::step() function. 4422 * 4423 * @since 6.7.0 Stub implementation. 4424 * 4425 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. 4426 * 4427 * @see https://html.spec.whatwg.org/#parsing-main-inframeset 4428 * @see WP_HTML_Processor::step 4429 * 4430 * @return bool Whether an element was found. 4431 */ 4432 private function step_in_frameset(): bool { 4433 $tag_name = $this->get_token_name(); 4434 $token_type = $this->get_token_type(); 4435 $op_sigil = '#tag' === $token_type ? ( $this->is_tag_closer() ? '-' : '+' ) : ''; 4436 $op = "{$op_sigil}{$tag_name}"; 4437 4438 switch ( $op ) { 4439 /* 4440 * > A character token that is one of U+0009 CHARACTER TABULATION, U+000A LINE FEED (LF), 4441 * > U+000C FORM FEED (FF), U+000D CARRIAGE RETURN (CR), or U+0020 SPACE 4442 * > 4443 * > Insert the character. 4444 * 4445 * This algorithm effectively strips non-whitespace characters from text and inserts 4446 * them under HTML. This is not supported at this time. 4447 */ 4448 case '#text': 4449 if ( parent::TEXT_IS_WHITESPACE === $this->text_node_classification ) { 4450 return $this->step_in_body(); 4451 } 4452 $this->bail( 'Non-whitespace characters cannot be handled in frameset.' ); 4453 break; 4454 4455 /* 4456 * > A comment token 4457 */ 4458 case '#comment': 4459 case '#funky-comment': 4460 case '#presumptuous-tag': 4461 $this->insert_html_element( $this->state->current_token ); 4462 return true; 4463 4464 /* 4465 * > A DOCTYPE token 4466 */ 4467 case 'html': 4468 // Parse error: ignore the token. 4469 return $this->step(); 4470 4471 /* 4472 * > A start tag whose tag name is "html" 4473 */ 4474 case '+HTML': 4475 return $this->step_in_body(); 4476 4477 /* 4478 * > A start tag whose tag name is "frameset" 4479 */ 4480 case '+FRAMESET': 4481 $this->insert_html_element( $this->state->current_token ); 4482 return true; 4483 4484 /* 4485 * > An end tag whose tag name is "frameset" 4486 */ 4487 case '-FRAMESET': 4488 /* 4489 * > If the current node is the root html element, then this is a parse error; 4490 * > ignore the token. (fragment case) 4491 */ 4492 if ( $this->state->stack_of_open_elements->current_node_is( 'HTML' ) ) { 4493 return $this->step(); 4494 } 4495 4496 /* 4497 * > Otherwise, pop the current node from the stack of open elements. 4498 */ 4499 $this->state->stack_of_open_elements->pop(); 4500 4501 /* 4502 * > If the parser was not created as part of the HTML fragment parsing algorithm 4503 * > (fragment case), and the current node is no longer a frameset element, then 4504 * > switch the insertion mode to "after frameset". 4505 */ 4506 if ( ! isset( $this->context_node ) && ! $this->state->stack_of_open_elements->current_node_is( 'FRAMESET' ) ) { 4507 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_AFTER_FRAMESET; 4508 } 4509 4510 return true; 4511 4512 /* 4513 * > A start tag whose tag name is "frame" 4514 * 4515 * > Insert an HTML element for the token. Immediately pop the 4516 * > current node off the stack of open elements. 4517 * > 4518 * > Acknowledge the token's self-closing flag, if it is set. 4519 */ 4520 case '+FRAME': 4521 $this->insert_html_element( $this->state->current_token ); 4522 $this->state->stack_of_open_elements->pop(); 4523 return true; 4524 4525 /* 4526 * > A start tag whose tag name is "noframes" 4527 */ 4528 case '+NOFRAMES': 4529 return $this->step_in_head(); 4530 } 4531 4532 // Parse error: ignore the token. 4533 return $this->step(); 4534 } 4535 4536 /** 4537 * Parses next element in the 'after frameset' insertion mode. 4538 * 4539 * This internal function performs the 'after frameset' insertion mode 4540 * logic for the generalized WP_HTML_Processor::step() function. 4541 * 4542 * @since 6.7.0 Stub implementation. 4543 * 4544 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. 4545 * 4546 * @see https://html.spec.whatwg.org/#parsing-main-afterframeset 4547 * @see WP_HTML_Processor::step 4548 * 4549 * @return bool Whether an element was found. 4550 */ 4551 private function step_after_frameset(): bool { 4552 $tag_name = $this->get_token_name(); 4553 $token_type = $this->get_token_type(); 4554 $op_sigil = '#tag' === $token_type ? ( $this->is_tag_closer() ? '-' : '+' ) : ''; 4555 $op = "{$op_sigil}{$tag_name}"; 4556 4557 switch ( $op ) { 4558 /* 4559 * > A character token that is one of U+0009 CHARACTER TABULATION, U+000A LINE FEED (LF), 4560 * > U+000C FORM FEED (FF), U+000D CARRIAGE RETURN (CR), or U+0020 SPACE 4561 * > 4562 * > Insert the character. 4563 * 4564 * This algorithm effectively strips non-whitespace characters from text and inserts 4565 * them under HTML. This is not supported at this time. 4566 */ 4567 case '#text': 4568 if ( parent::TEXT_IS_WHITESPACE === $this->text_node_classification ) { 4569 return $this->step_in_body(); 4570 } 4571 $this->bail( 'Non-whitespace characters cannot be handled in after frameset' ); 4572 break; 4573 4574 /* 4575 * > A comment token 4576 */ 4577 case '#comment': 4578 case '#funky-comment': 4579 case '#presumptuous-tag': 4580 $this->insert_html_element( $this->state->current_token ); 4581 return true; 4582 4583 /* 4584 * > A DOCTYPE token 4585 */ 4586 case 'html': 4587 // Parse error: ignore the token. 4588 return $this->step(); 4589 4590 /* 4591 * > A start tag whose tag name is "html" 4592 */ 4593 case '+HTML': 4594 return $this->step_in_body(); 4595 4596 /* 4597 * > An end tag whose tag name is "html" 4598 */ 4599 case '-HTML': 4600 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_AFTER_AFTER_FRAMESET; 4601 /* 4602 * The HTML element is not removed from the stack of open elements. 4603 * Only internal state has changed, this does not qualify as a "step" 4604 * in terms of advancing through the document to another token. 4605 * Nothing has been pushed or popped. 4606 * Proceed to parse the next item. 4607 */ 4608 return $this->step(); 4609 4610 /* 4611 * > A start tag whose tag name is "noframes" 4612 */ 4613 case '+NOFRAMES': 4614 return $this->step_in_head(); 4615 } 4616 4617 // Parse error: ignore the token. 4618 return $this->step(); 4619 } 4620 4621 /** 4622 * Parses next element in the 'after after body' insertion mode. 4623 * 4624 * This internal function performs the 'after after body' insertion mode 4625 * logic for the generalized WP_HTML_Processor::step() function. 4626 * 4627 * @since 6.7.0 Stub implementation. 4628 * 4629 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. 4630 * 4631 * @see https://html.spec.whatwg.org/#the-after-after-body-insertion-mode 4632 * @see WP_HTML_Processor::step 4633 * 4634 * @return bool Whether an element was found. 4635 */ 4636 private function step_after_after_body(): bool { 4637 $tag_name = $this->get_token_name(); 4638 $token_type = $this->get_token_type(); 4639 $op_sigil = '#tag' === $token_type ? ( $this->is_tag_closer() ? '-' : '+' ) : ''; 4640 $op = "{$op_sigil}{$tag_name}"; 4641 4642 switch ( $op ) { 4643 /* 4644 * > A comment token 4645 */ 4646 case '#comment': 4647 case '#funky-comment': 4648 case '#presumptuous-tag': 4649 $this->bail( 'Content outside of HTML is unsupported.' ); 4650 break; 4651 4652 /* 4653 * > A DOCTYPE token 4654 * > A start tag whose tag name is "html" 4655 * 4656 * > Process the token using the rules for the "in body" insertion mode. 4657 */ 4658 case 'html': 4659 case '+HTML': 4660 return $this->step_in_body(); 4661 4662 /* 4663 * > A character token that is one of U+0009 CHARACTER TABULATION, U+000A LINE FEED (LF), 4664 * > U+000C FORM FEED (FF), U+000D CARRIAGE RETURN (CR), or U+0020 SPACE 4665 * > 4666 * > Process the token using the rules for the "in body" insertion mode. 4667 */ 4668 case '#text': 4669 if ( parent::TEXT_IS_WHITESPACE === $this->text_node_classification ) { 4670 return $this->step_in_body(); 4671 } 4672 goto after_after_body_anything_else; 4673 break; 4674 } 4675 4676 /* 4677 * > Parse error. Switch the insertion mode to "in body" and reprocess the token. 4678 */ 4679 after_after_body_anything_else: 4680 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_BODY; 4681 return $this->step( self::REPROCESS_CURRENT_NODE ); 4682 } 4683 4684 /** 4685 * Parses next element in the 'after after frameset' insertion mode. 4686 * 4687 * This internal function performs the 'after after frameset' insertion mode 4688 * logic for the generalized WP_HTML_Processor::step() function. 4689 * 4690 * @since 6.7.0 Stub implementation. 4691 * 4692 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. 4693 * 4694 * @see https://html.spec.whatwg.org/#the-after-after-frameset-insertion-mode 4695 * @see WP_HTML_Processor::step 4696 * 4697 * @return bool Whether an element was found. 4698 */ 4699 private function step_after_after_frameset(): bool { 4700 $tag_name = $this->get_token_name(); 4701 $token_type = $this->get_token_type(); 4702 $op_sigil = '#tag' === $token_type ? ( $this->is_tag_closer() ? '-' : '+' ) : ''; 4703 $op = "{$op_sigil}{$tag_name}"; 4704 4705 switch ( $op ) { 4706 /* 4707 * > A comment token 4708 */ 4709 case '#comment': 4710 case '#funky-comment': 4711 case '#presumptuous-tag': 4712 $this->bail( 'Content outside of HTML is unsupported.' ); 4713 break; 4714 4715 /* 4716 * > A DOCTYPE token 4717 * > A start tag whose tag name is "html" 4718 * 4719 * > Process the token using the rules for the "in body" insertion mode. 4720 */ 4721 case 'html': 4722 case '+HTML': 4723 return $this->step_in_body(); 4724 4725 /* 4726 * > A character token that is one of U+0009 CHARACTER TABULATION, U+000A LINE FEED (LF), 4727 * > U+000C FORM FEED (FF), U+000D CARRIAGE RETURN (CR), or U+0020 SPACE 4728 * > 4729 * > Process the token using the rules for the "in body" insertion mode. 4730 * 4731 * This algorithm effectively strips non-whitespace characters from text and inserts 4732 * them under HTML. This is not supported at this time. 4733 */ 4734 case '#text': 4735 if ( parent::TEXT_IS_WHITESPACE === $this->text_node_classification ) { 4736 return $this->step_in_body(); 4737 } 4738 $this->bail( 'Non-whitespace characters cannot be handled in after after frameset.' ); 4739 break; 4740 4741 /* 4742 * > A start tag whose tag name is "noframes" 4743 */ 4744 case '+NOFRAMES': 4745 return $this->step_in_head(); 4746 } 4747 4748 // Parse error: ignore the token. 4749 return $this->step(); 4750 } 4751 4752 /** 4753 * Parses next element in the 'in foreign content' insertion mode. 4754 * 4755 * This internal function performs the 'in foreign content' insertion mode 4756 * logic for the generalized WP_HTML_Processor::step() function. 4757 * 4758 * @since 6.7.0 Stub implementation. 4759 * 4760 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. 4761 * 4762 * @see https://html.spec.whatwg.org/#parsing-main-inforeign 4763 * @see WP_HTML_Processor::step 4764 * 4765 * @return bool Whether an element was found. 4766 */ 4767 private function step_in_foreign_content(): bool { 4768 $tag_name = $this->get_token_name(); 4769 $token_type = $this->get_token_type(); 4770 $op_sigil = '#tag' === $token_type ? ( $this->is_tag_closer() ? '-' : '+' ) : ''; 4771 $op = "{$op_sigil}{$tag_name}"; 4772 4773 /* 4774 * > A start tag whose name is "font", if the token has any attributes named "color", "face", or "size" 4775 * 4776 * This section drawn out above the switch to more easily incorporate 4777 * the additional rules based on the presence of the attributes. 4778 */ 4779 if ( 4780 '+FONT' === $op && 4781 ( 4782 null !== $this->get_attribute( 'color' ) || 4783 null !== $this->get_attribute( 'face' ) || 4784 null !== $this->get_attribute( 'size' ) 4785 ) 4786 ) { 4787 $op = '+FONT with attributes'; 4788 } 4789 4790 switch ( $op ) { 4791 case '#text': 4792 /* 4793 * > A character token that is U+0000 NULL 4794 * 4795 * This is handled by `get_modifiable_text()`. 4796 */ 4797 4798 /* 4799 * Whitespace-only text does not affect the frameset-ok flag. 4800 * It is probably inter-element whitespace, but it may also 4801 * contain character references which decode only to whitespace. 4802 */ 4803 if ( parent::TEXT_IS_GENERIC === $this->text_node_classification ) { 4804 $this->state->frameset_ok = false; 4805 } 4806 4807 $this->insert_foreign_element( $this->state->current_token, false ); 4808 return true; 4809 4810 /* 4811 * CDATA sections are alternate wrappers for text content and therefore 4812 * ought to follow the same rules as text nodes. 4813 */ 4814 case '#cdata-section': 4815 /* 4816 * NULL bytes and whitespace do not change the frameset-ok flag. 4817 */ 4818 $current_token = $this->bookmarks[ $this->state->current_token->bookmark_name ]; 4819 $cdata_content_start = $current_token->start + 9; 4820 $cdata_content_length = $current_token->length - 12; 4821 if ( strspn( $this->html, "\0 \t\n\f\r", $cdata_content_start, $cdata_content_length ) !== $cdata_content_length ) { 4822 $this->state->frameset_ok = false; 4823 } 4824 4825 $this->insert_foreign_element( $this->state->current_token, false ); 4826 return true; 4827 4828 /* 4829 * > A comment token 4830 */ 4831 case '#comment': 4832 case '#funky-comment': 4833 case '#presumptuous-tag': 4834 $this->insert_foreign_element( $this->state->current_token, false ); 4835 return true; 4836 4837 /* 4838 * > A DOCTYPE token 4839 */ 4840 case 'html': 4841 // Parse error: ignore the token. 4842 return $this->step(); 4843 4844 /* 4845 * > A start tag whose tag name is "b", "big", "blockquote", "body", "br", "center", 4846 * > "code", "dd", "div", "dl", "dt", "em", "embed", "h1", "h2", "h3", "h4", "h5", 4847 * > "h6", "head", "hr", "i", "img", "li", "listing", "menu", "meta", "nobr", "ol", 4848 * > "p", "pre", "ruby", "s", "small", "span", "strong", "strike", "sub", "sup", 4849 * > "table", "tt", "u", "ul", "var" 4850 * 4851 * > A start tag whose name is "font", if the token has any attributes named "color", "face", or "size" 4852 * 4853 * > An end tag whose tag name is "br", "p" 4854 * 4855 * Closing BR tags are always reported by the Tag Processor as opening tags. 4856 */ 4857 case '+B': 4858 case '+BIG': 4859 case '+BLOCKQUOTE': 4860 case '+BODY': 4861 case '+BR': 4862 case '+CENTER': 4863 case '+CODE': 4864 case '+DD': 4865 case '+DIV': 4866 case '+DL': 4867 case '+DT': 4868 case '+EM': 4869 case '+EMBED': 4870 case '+H1': 4871 case '+H2': 4872 case '+H3': 4873 case '+H4': 4874 case '+H5': 4875 case '+H6': 4876 case '+HEAD': 4877 case '+HR': 4878 case '+I': 4879 case '+IMG': 4880 case '+LI': 4881 case '+LISTING': 4882 case '+MENU': 4883 case '+META': 4884 case '+NOBR': 4885 case '+OL': 4886 case '+P': 4887 case '+PRE': 4888 case '+RUBY': 4889 case '+S': 4890 case '+SMALL': 4891 case '+SPAN': 4892 case '+STRONG': 4893 case '+STRIKE': 4894 case '+SUB': 4895 case '+SUP': 4896 case '+TABLE': 4897 case '+TT': 4898 case '+U': 4899 case '+UL': 4900 case '+VAR': 4901 case '+FONT with attributes': 4902 case '-BR': 4903 case '-P': 4904 // @todo Indicate a parse error once it's possible. 4905 foreach ( $this->state->stack_of_open_elements->walk_up() as $current_node ) { 4906 if ( 4907 'math' === $current_node->integration_node_type || 4908 'html' === $current_node->integration_node_type || 4909 'html' === $current_node->namespace 4910 ) { 4911 break; 4912 } 4913 4914 $this->state->stack_of_open_elements->pop(); 4915 } 4916 goto in_foreign_content_process_in_current_insertion_mode; 4917 } 4918 4919 /* 4920 * > Any other start tag 4921 */ 4922 if ( ! $this->is_tag_closer() ) { 4923 $this->insert_foreign_element( $this->state->current_token, false ); 4924 4925 /* 4926 * > If the token has its self-closing flag set, then run 4927 * > the appropriate steps from the following list: 4928 * > 4929 * > ↪ the token's tag name is "script", and the new current node is in the SVG namespace 4930 * > Acknowledge the token's self-closing flag, and then act as 4931 * > described in the steps for a "script" end tag below. 4932 * > 4933 * > ↪ Otherwise 4934 * > Pop the current node off the stack of open elements and 4935 * > acknowledge the token's self-closing flag. 4936 * 4937 * Since the rules for SCRIPT below indicate to pop the element off of the stack of 4938 * open elements, which is the same for the Otherwise condition, there's no need to 4939 * separate these checks. The difference comes when a parser operates with the scripting 4940 * flag enabled, and executes the script, which this parser does not support. 4941 */ 4942 if ( $this->state->current_token->has_self_closing_flag ) { 4943 $this->state->stack_of_open_elements->pop(); 4944 } 4945 return true; 4946 } 4947 4948 /* 4949 * > An end tag whose name is "script", if the current node is an SVG script element. 4950 */ 4951 if ( $this->is_tag_closer() && 'SCRIPT' === $this->state->current_token->node_name && 'svg' === $this->state->current_token->namespace ) { 4952 $this->state->stack_of_open_elements->pop(); 4953 return true; 4954 } 4955 4956 /* 4957 * > Any other end tag 4958 */ 4959 if ( $this->is_tag_closer() ) { 4960 $node = $this->state->stack_of_open_elements->current_node(); 4961 if ( $tag_name !== $node->node_name ) { 4962 // @todo Indicate a parse error once it's possible. 4963 } 4964 in_foreign_content_end_tag_loop: 4965 if ( $node === $this->state->stack_of_open_elements->at( 1 ) ) { 4966 return true; 4967 } 4968 4969 /* 4970 * > If node's tag name, converted to ASCII lowercase, is the same as the tag name 4971 * > of the token, pop elements from the stack of open elements until node has 4972 * > been popped from the stack, and then return. 4973 */ 4974 if ( 0 === strcasecmp( $node->node_name, $tag_name ) ) { 4975 foreach ( $this->state->stack_of_open_elements->walk_up() as $item ) { 4976 $this->state->stack_of_open_elements->pop(); 4977 if ( $node === $item ) { 4978 return true; 4979 } 4980 } 4981 } 4982 4983 foreach ( $this->state->stack_of_open_elements->walk_up( $node ) as $item ) { 4984 $node = $item; 4985 break; 4986 } 4987 4988 if ( 'html' !== $node->namespace ) { 4989 goto in_foreign_content_end_tag_loop; 4990 } 4991 4992 in_foreign_content_process_in_current_insertion_mode: 4993 switch ( $this->state->insertion_mode ) { 4994 case WP_HTML_Processor_State::INSERTION_MODE_INITIAL: 4995 return $this->step_initial(); 4996 4997 case WP_HTML_Processor_State::INSERTION_MODE_BEFORE_HTML: 4998 return $this->step_before_html(); 4999 5000 case WP_HTML_Processor_State::INSERTION_MODE_BEFORE_HEAD: 5001 return $this->step_before_head(); 5002 5003 case WP_HTML_Processor_State::INSERTION_MODE_IN_HEAD: 5004 return $this->step_in_head(); 5005 5006 case WP_HTML_Processor_State::INSERTION_MODE_IN_HEAD_NOSCRIPT: 5007 return $this->step_in_head_noscript(); 5008 5009 case WP_HTML_Processor_State::INSERTION_MODE_AFTER_HEAD: 5010 return $this->step_after_head(); 5011 5012 case WP_HTML_Processor_State::INSERTION_MODE_IN_BODY: 5013 return $this->step_in_body(); 5014 5015 case WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE: 5016 return $this->step_in_table(); 5017 5018 case WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE_TEXT: 5019 return $this->step_in_table_text(); 5020 5021 case WP_HTML_Processor_State::INSERTION_MODE_IN_CAPTION: 5022 return $this->step_in_caption(); 5023 5024 case WP_HTML_Processor_State::INSERTION_MODE_IN_COLUMN_GROUP: 5025 return $this->step_in_column_group(); 5026 5027 case WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE_BODY: 5028 return $this->step_in_table_body(); 5029 5030 case WP_HTML_Processor_State::INSERTION_MODE_IN_ROW: 5031 return $this->step_in_row(); 5032 5033 case WP_HTML_Processor_State::INSERTION_MODE_IN_CELL: 5034 return $this->step_in_cell(); 5035 5036 case WP_HTML_Processor_State::INSERTION_MODE_IN_SELECT: 5037 return $this->step_in_select(); 5038 5039 case WP_HTML_Processor_State::INSERTION_MODE_IN_SELECT_IN_TABLE: 5040 return $this->step_in_select_in_table(); 5041 5042 case WP_HTML_Processor_State::INSERTION_MODE_IN_TEMPLATE: 5043 return $this->step_in_template(); 5044 5045 case WP_HTML_Processor_State::INSERTION_MODE_AFTER_BODY: 5046 return $this->step_after_body(); 5047 5048 case WP_HTML_Processor_State::INSERTION_MODE_IN_FRAMESET: 5049 return $this->step_in_frameset(); 5050 5051 case WP_HTML_Processor_State::INSERTION_MODE_AFTER_FRAMESET: 5052 return $this->step_after_frameset(); 5053 5054 case WP_HTML_Processor_State::INSERTION_MODE_AFTER_AFTER_BODY: 5055 return $this->step_after_after_body(); 5056 5057 case WP_HTML_Processor_State::INSERTION_MODE_AFTER_AFTER_FRAMESET: 5058 return $this->step_after_after_frameset(); 5059 5060 // This should be unreachable but PHP doesn't have total type checking on switch. 5061 default: 5062 $this->bail( "Unaware of the requested parsing mode: '{$this->state->insertion_mode}'." ); 5063 } 5064 } 5065 5066 $this->bail( 'Should not have been able to reach end of IN FOREIGN CONTENT processing. Check HTML API code.' ); 5067 // This unnecessary return prevents tools from inaccurately reporting type errors. 5068 return false; 5069 } 5070 5071 /* 5072 * Internal helpers 5073 */ 5074 5075 /** 5076 * Creates a new bookmark for the currently-matched token and returns the generated name. 5077 * 5078 * @since 6.4.0 5079 * @since 6.5.0 Renamed from bookmark_tag() to bookmark_token(). 5080 * 5081 * @throws Exception When unable to allocate requested bookmark. 5082 * 5083 * @return string|false Name of created bookmark, or false if unable to create. 5084 */ 5085 private function bookmark_token() { 5086 if ( ! parent::set_bookmark( ++$this->bookmark_counter ) ) { 5087 $this->last_error = self::ERROR_EXCEEDED_MAX_BOOKMARKS; 5088 throw new Exception( 'could not allocate bookmark' ); 5089 } 5090 5091 return "{$this->bookmark_counter}"; 5092 } 5093 5094 /* 5095 * HTML semantic overrides for Tag Processor 5096 */ 5097 5098 /** 5099 * Indicates the namespace of the current token, or "html" if there is none. 5100 * 5101 * @return string One of "html", "math", or "svg". 5102 */ 5103 public function get_namespace(): string { 5104 if ( ! isset( $this->current_element ) ) { 5105 return parent::get_namespace(); 5106 } 5107 5108 return $this->current_element->token->namespace; 5109 } 5110 5111 /** 5112 * Returns the uppercase name of the matched tag. 5113 * 5114 * The semantic rules for HTML specify that certain tags be reprocessed 5115 * with a different tag name. Because of this, the tag name presented 5116 * by the HTML Processor may differ from the one reported by the HTML 5117 * Tag Processor, which doesn't apply these semantic rules. 5118 * 5119 * Example: 5120 * 5121 * $processor = new WP_HTML_Tag_Processor( '<div class="test">Test</div>' ); 5122 * $processor->next_tag() === true; 5123 * $processor->get_tag() === 'DIV'; 5124 * 5125 * $processor->next_tag() === false; 5126 * $processor->get_tag() === null; 5127 * 5128 * @since 6.4.0 5129 * 5130 * @return string|null Name of currently matched tag in input HTML, or `null` if none found. 5131 */ 5132 public function get_tag(): ?string { 5133 if ( null !== $this->last_error ) { 5134 return null; 5135 } 5136 5137 if ( $this->is_virtual() ) { 5138 return $this->current_element->token->node_name; 5139 } 5140 5141 $tag_name = parent::get_tag(); 5142 5143 /* 5144 * > A start tag whose tag name is "image" 5145 * > Change the token's tag name to "img" and reprocess it. (Don't ask.) 5146 */ 5147 return ( 'IMAGE' === $tag_name && 'html' === $this->get_namespace() ) 5148 ? 'IMG' 5149 : $tag_name; 5150 } 5151 5152 /** 5153 * Indicates if the currently matched tag contains the self-closing flag. 5154 * 5155 * No HTML elements ought to have the self-closing flag and for those, the self-closing 5156 * flag will be ignored. For void elements this is benign because they "self close" 5157 * automatically. For non-void HTML elements though problems will appear if someone 5158 * intends to use a self-closing element in place of that element with an empty body. 5159 * For HTML foreign elements and custom elements the self-closing flag determines if 5160 * they self-close or not. 5161 * 5162 * This function does not determine if a tag is self-closing, 5163 * but only if the self-closing flag is present in the syntax. 5164 * 5165 * @since 6.6.0 Subclassed for the HTML Processor. 5166 * 5167 * @return bool Whether the currently matched tag contains the self-closing flag. 5168 */ 5169 public function has_self_closing_flag(): bool { 5170 return $this->is_virtual() ? false : parent::has_self_closing_flag(); 5171 } 5172 5173 /** 5174 * Returns the node name represented by the token. 5175 * 5176 * This matches the DOM API value `nodeName`. Some values 5177 * are static, such as `#text` for a text node, while others 5178 * are dynamically generated from the token itself. 5179 * 5180 * Dynamic names: 5181 * - Uppercase tag name for tag matches. 5182 * - `html` for DOCTYPE declarations. 5183 * 5184 * Note that if the Tag Processor is not matched on a token 5185 * then this function will return `null`, either because it 5186 * hasn't yet found a token or because it reached the end 5187 * of the document without matching a token. 5188 * 5189 * @since 6.6.0 Subclassed for the HTML Processor. 5190 * 5191 * @return string|null Name of the matched token. 5192 */ 5193 public function get_token_name(): ?string { 5194 return $this->is_virtual() 5195 ? $this->current_element->token->node_name 5196 : parent::get_token_name(); 5197 } 5198 5199 /** 5200 * Indicates the kind of matched token, if any. 5201 * 5202 * This differs from `get_token_name()` in that it always 5203 * returns a static string indicating the type, whereas 5204 * `get_token_name()` may return values derived from the 5205 * token itself, such as a tag name or processing 5206 * instruction tag. 5207 * 5208 * Possible values: 5209 * - `#tag` when matched on a tag. 5210 * - `#text` when matched on a text node. 5211 * - `#cdata-section` when matched on a CDATA node. 5212 * - `#comment` when matched on a comment. 5213 * - `#doctype` when matched on a DOCTYPE declaration. 5214 * - `#presumptuous-tag` when matched on an empty tag closer. 5215 * - `#funky-comment` when matched on a funky comment. 5216 * 5217 * @since 6.6.0 Subclassed for the HTML Processor. 5218 * 5219 * @return string|null What kind of token is matched, or null. 5220 */ 5221 public function get_token_type(): ?string { 5222 if ( $this->is_virtual() ) { 5223 /* 5224 * This logic comes from the Tag Processor. 5225 * 5226 * @todo It would be ideal not to repeat this here, but it's not clearly 5227 * better to allow passing a token name to `get_token_type()`. 5228 */ 5229 $node_name = $this->current_element->token->node_name; 5230 $starting_char = $node_name[0]; 5231 if ( 'A' <= $starting_char && 'Z' >= $starting_char ) { 5232 return '#tag'; 5233 } 5234 5235 if ( 'html' === $node_name ) { 5236 return '#doctype'; 5237 } 5238 5239 return $node_name; 5240 } 5241 5242 return parent::get_token_type(); 5243 } 5244 5245 /** 5246 * Returns the value of a requested attribute from a matched tag opener if that attribute exists. 5247 * 5248 * Example: 5249 * 5250 * $p = WP_HTML_Processor::create_fragment( '<div enabled class="test" data-test-id="14">Test</div>' ); 5251 * $p->next_token() === true; 5252 * $p->get_attribute( 'data-test-id' ) === '14'; 5253 * $p->get_attribute( 'enabled' ) === true; 5254 * $p->get_attribute( 'aria-label' ) === null; 5255 * 5256 * $p->next_tag() === false; 5257 * $p->get_attribute( 'class' ) === null; 5258 * 5259 * @since 6.6.0 Subclassed for HTML Processor. 5260 * 5261 * @param string $name Name of attribute whose value is requested. 5262 * @return string|true|null Value of attribute or `null` if not available. Boolean attributes return `true`. 5263 */ 5264 public function get_attribute( $name ) { 5265 return $this->is_virtual() ? null : parent::get_attribute( $name ); 5266 } 5267 5268 /** 5269 * Updates or creates a new attribute on the currently matched tag with the passed value. 5270 * 5271 * For boolean attributes special handling is provided: 5272 * - When `true` is passed as the value, then only the attribute name is added to the tag. 5273 * - When `false` is passed, the attribute gets removed if it existed before. 5274 * 5275 * For string attributes, the value is escaped using the `esc_attr` function. 5276 * 5277 * @since 6.6.0 Subclassed for the HTML Processor. 5278 * 5279 * @param string $name The attribute name to target. 5280 * @param string|bool $value The new attribute value. 5281 * @return bool Whether an attribute value was set. 5282 */ 5283 public function set_attribute( $name, $value ): bool { 5284 return $this->is_virtual() ? false : parent::set_attribute( $name, $value ); 5285 } 5286 5287 /** 5288 * Remove an attribute from the currently-matched tag. 5289 * 5290 * @since 6.6.0 Subclassed for HTML Processor. 5291 * 5292 * @param string $name The attribute name to remove. 5293 * @return bool Whether an attribute was removed. 5294 */ 5295 public function remove_attribute( $name ): bool { 5296 return $this->is_virtual() ? false : parent::remove_attribute( $name ); 5297 } 5298 5299 /** 5300 * Gets lowercase names of all attributes matching a given prefix in the current tag. 5301 * 5302 * Note that matching is case-insensitive. This is in accordance with the spec: 5303 * 5304 * > There must never be two or more attributes on 5305 * > the same start tag whose names are an ASCII 5306 * > case-insensitive match for each other. 5307 * - HTML 5 spec 5308 * 5309 * Example: 5310 * 5311 * $p = new WP_HTML_Tag_Processor( '<div data-ENABLED class="test" DATA-test-id="14">Test</div>' ); 5312 * $p->next_tag( array( 'class_name' => 'test' ) ) === true; 5313 * $p->get_attribute_names_with_prefix( 'data-' ) === array( 'data-enabled', 'data-test-id' ); 5314 * 5315 * $p->next_tag() === false; 5316 * $p->get_attribute_names_with_prefix( 'data-' ) === null; 5317 * 5318 * @since 6.6.0 Subclassed for the HTML Processor. 5319 * 5320 * @see https://html.spec.whatwg.org/multipage/syntax.html#attributes-2:ascii-case-insensitive 5321 * 5322 * @param string $prefix Prefix of requested attribute names. 5323 * @return array|null List of attribute names, or `null` when no tag opener is matched. 5324 */ 5325 public function get_attribute_names_with_prefix( $prefix ): ?array { 5326 return $this->is_virtual() ? null : parent::get_attribute_names_with_prefix( $prefix ); 5327 } 5328 5329 /** 5330 * Adds a new class name to the currently matched tag. 5331 * 5332 * @since 6.6.0 Subclassed for the HTML Processor. 5333 * 5334 * @param string $class_name The class name to add. 5335 * @return bool Whether the class was set to be added. 5336 */ 5337 public function add_class( $class_name ): bool { 5338 return $this->is_virtual() ? false : parent::add_class( $class_name ); 5339 } 5340 5341 /** 5342 * Removes a class name from the currently matched tag. 5343 * 5344 * @since 6.6.0 Subclassed for the HTML Processor. 5345 * 5346 * @param string $class_name The class name to remove. 5347 * @return bool Whether the class was set to be removed. 5348 */ 5349 public function remove_class( $class_name ): bool { 5350 return $this->is_virtual() ? false : parent::remove_class( $class_name ); 5351 } 5352 5353 /** 5354 * Returns if a matched tag contains the given ASCII case-insensitive class name. 5355 * 5356 * @since 6.6.0 Subclassed for the HTML Processor. 5357 * 5358 * @todo When reconstructing active formatting elements with attributes, find a way 5359 * to indicate if the virtually-reconstructed formatting elements contain the 5360 * wanted class name. 5361 * 5362 * @param string $wanted_class Look for this CSS class name, ASCII case-insensitive. 5363 * @return bool|null Whether the matched tag contains the given class name, or null if not matched. 5364 */ 5365 public function has_class( $wanted_class ): ?bool { 5366 return $this->is_virtual() ? null : parent::has_class( $wanted_class ); 5367 } 5368 5369 /** 5370 * Generator for a foreach loop to step through each class name for the matched tag. 5371 * 5372 * This generator function is designed to be used inside a "foreach" loop. 5373 * 5374 * Example: 5375 * 5376 * $p = WP_HTML_Processor::create_fragment( "<div class='free <egg<\tlang-en'>" ); 5377 * $p->next_tag(); 5378 * foreach ( $p->class_list() as $class_name ) { 5379 * echo "{$class_name} "; 5380 * } 5381 * // Outputs: "free <egg> lang-en " 5382 * 5383 * @since 6.6.0 Subclassed for the HTML Processor. 5384 */ 5385 public function class_list() { 5386 return $this->is_virtual() ? null : parent::class_list(); 5387 } 5388 5389 /** 5390 * Returns the modifiable text for a matched token, or an empty string. 5391 * 5392 * Modifiable text is text content that may be read and changed without 5393 * changing the HTML structure of the document around it. This includes 5394 * the contents of `#text` nodes in the HTML as well as the inner 5395 * contents of HTML comments, Processing Instructions, and others, even 5396 * though these nodes aren't part of a parsed DOM tree. They also contain 5397 * the contents of SCRIPT and STYLE tags, of TEXTAREA tags, and of any 5398 * other section in an HTML document which cannot contain HTML markup (DATA). 5399 * 5400 * If a token has no modifiable text then an empty string is returned to 5401 * avoid needless crashing or type errors. An empty string does not mean 5402 * that a token has modifiable text, and a token with modifiable text may 5403 * have an empty string (e.g. a comment with no contents). 5404 * 5405 * @since 6.6.0 Subclassed for the HTML Processor. 5406 * 5407 * @return string 5408 */ 5409 public function get_modifiable_text(): string { 5410 return $this->is_virtual() ? '' : parent::get_modifiable_text(); 5411 } 5412 5413 /** 5414 * Indicates what kind of comment produced the comment node. 5415 * 5416 * Because there are different kinds of HTML syntax which produce 5417 * comments, the Tag Processor tracks and exposes this as a type 5418 * for the comment. Nominally only regular HTML comments exist as 5419 * they are commonly known, but a number of unrelated syntax errors 5420 * also produce comments. 5421 * 5422 * @see self::COMMENT_AS_ABRUPTLY_CLOSED_COMMENT 5423 * @see self::COMMENT_AS_CDATA_LOOKALIKE 5424 * @see self::COMMENT_AS_INVALID_HTML 5425 * @see self::COMMENT_AS_HTML_COMMENT 5426 * @see self::COMMENT_AS_PI_NODE_LOOKALIKE 5427 * 5428 * @since 6.6.0 Subclassed for the HTML Processor. 5429 * 5430 * @return string|null 5431 */ 5432 public function get_comment_type(): ?string { 5433 return $this->is_virtual() ? null : parent::get_comment_type(); 5434 } 5435 5436 /** 5437 * Removes a bookmark that is no longer needed. 5438 * 5439 * Releasing a bookmark frees up the small 5440 * performance overhead it requires. 5441 * 5442 * @since 6.4.0 5443 * 5444 * @param string $bookmark_name Name of the bookmark to remove. 5445 * @return bool Whether the bookmark already existed before removal. 5446 */ 5447 public function release_bookmark( $bookmark_name ): bool { 5448 return parent::release_bookmark( "_{$bookmark_name}" ); 5449 } 5450 5451 /** 5452 * Moves the internal cursor in the HTML Processor to a given bookmark's location. 5453 * 5454 * Be careful! Seeking backwards to a previous location resets the parser to the 5455 * start of the document and reparses the entire contents up until it finds the 5456 * sought-after bookmarked location. 5457 * 5458 * In order to prevent accidental infinite loops, there's a 5459 * maximum limit on the number of times seek() can be called. 5460 * 5461 * @throws Exception When unable to allocate a bookmark for the next token in the input HTML document. 5462 * 5463 * @since 6.4.0 5464 * 5465 * @param string $bookmark_name Jump to the place in the document identified by this bookmark name. 5466 * @return bool Whether the internal cursor was successfully moved to the bookmark's location. 5467 */ 5468 public function seek( $bookmark_name ): bool { 5469 // Flush any pending updates to the document before beginning. 5470 $this->get_updated_html(); 5471 5472 $actual_bookmark_name = "_{$bookmark_name}"; 5473 $processor_started_at = $this->state->current_token 5474 ? $this->bookmarks[ $this->state->current_token->bookmark_name ]->start 5475 : 0; 5476 $bookmark_starts_at = $this->bookmarks[ $actual_bookmark_name ]->start; 5477 $direction = $bookmark_starts_at > $processor_started_at ? 'forward' : 'backward'; 5478 5479 /* 5480 * If seeking backwards, it's possible that the sought-after bookmark exists within an element 5481 * which has been closed before the current cursor; in other words, it has already been removed 5482 * from the stack of open elements. This means that it's insufficient to simply pop off elements 5483 * from the stack of open elements which appear after the bookmarked location and then jump to 5484 * that location, as the elements which were open before won't be re-opened. 5485 * 5486 * In order to maintain consistency, the HTML Processor rewinds to the start of the document 5487 * and reparses everything until it finds the sought-after bookmark. 5488 * 5489 * There are potentially better ways to do this: cache the parser state for each bookmark and 5490 * restore it when seeking; store an immutable and idempotent register of where elements open 5491 * and close. 5492 * 5493 * If caching the parser state it will be essential to properly maintain the cached stack of 5494 * open elements and active formatting elements when modifying the document. This could be a 5495 * tedious and time-consuming process as well, and so for now will not be performed. 5496 * 5497 * It may be possible to track bookmarks for where elements open and close, and in doing so 5498 * be able to quickly recalculate breadcrumbs for any element in the document. It may even 5499 * be possible to remove the stack of open elements and compute it on the fly this way. 5500 * If doing this, the parser would need to track the opening and closing locations for all 5501 * tokens in the breadcrumb path for any and all bookmarks. By utilizing bookmarks themselves 5502 * this list could be automatically maintained while modifying the document. Finding the 5503 * breadcrumbs would then amount to traversing that list from the start until the token 5504 * being inspected. Once an element closes, if there are no bookmarks pointing to locations 5505 * within that element, then all of these locations may be forgotten to save on memory use 5506 * and computation time. 5507 */ 5508 if ( 'backward' === $direction ) { 5509 5510 /* 5511 * When moving backward, stateful stacks should be cleared. 5512 */ 5513 foreach ( $this->state->stack_of_open_elements->walk_up() as $item ) { 5514 $this->state->stack_of_open_elements->remove_node( $item ); 5515 } 5516 5517 foreach ( $this->state->active_formatting_elements->walk_up() as $item ) { 5518 $this->state->active_formatting_elements->remove_node( $item ); 5519 } 5520 5521 /* 5522 * **After** clearing stacks, more processor state can be reset. 5523 * This must be done after clearing the stack because those stacks generate events that 5524 * would appear on a subsequent call to `next_token()`. 5525 */ 5526 $this->state->frameset_ok = true; 5527 $this->state->stack_of_template_insertion_modes = array(); 5528 $this->state->head_element = null; 5529 $this->state->form_element = null; 5530 $this->state->current_token = null; 5531 $this->current_element = null; 5532 $this->element_queue = array(); 5533 5534 /* 5535 * The absence of a context node indicates a full parse. 5536 * The presence of a context node indicates a fragment parser. 5537 */ 5538 if ( null === $this->context_node ) { 5539 $this->change_parsing_namespace( 'html' ); 5540 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_INITIAL; 5541 $this->breadcrumbs = array(); 5542 5543 $this->bookmarks['initial'] = new WP_HTML_Span( 0, 0 ); 5544 parent::seek( 'initial' ); 5545 unset( $this->bookmarks['initial'] ); 5546 } else { 5547 5548 /* 5549 * Push the root-node (HTML) back onto the stack of open elements. 5550 * 5551 * Fragment parsers require this extra bit of setup. 5552 * It's handled in full parsers by advancing the processor state. 5553 */ 5554 $this->state->stack_of_open_elements->push( 5555 new WP_HTML_Token( 5556 'root-node', 5557 'HTML', 5558 false 5559 ) 5560 ); 5561 5562 $this->change_parsing_namespace( 5563 $this->context_node->integration_node_type 5564 ? 'html' 5565 : $this->context_node->namespace 5566 ); 5567 5568 if ( 'TEMPLATE' === $this->context_node->node_name ) { 5569 $this->state->stack_of_template_insertion_modes[] = WP_HTML_Processor_State::INSERTION_MODE_IN_TEMPLATE; 5570 } 5571 5572 $this->reset_insertion_mode_appropriately(); 5573 $this->breadcrumbs = array_slice( $this->breadcrumbs, 0, 2 ); 5574 parent::seek( $this->context_node->bookmark_name ); 5575 } 5576 } 5577 5578 /* 5579 * Here, the processor moves forward through the document until it matches the bookmark. 5580 * do-while is used here because the processor is expected to already be stopped on 5581 * a token than may match the bookmarked location. 5582 */ 5583 do { 5584 /* 5585 * The processor will stop on virtual tokens, but bookmarks may not be set on them. 5586 * They should not be matched when seeking a bookmark, skip them. 5587 */ 5588 if ( $this->is_virtual() ) { 5589 continue; 5590 } 5591 if ( $bookmark_starts_at === $this->bookmarks[ $this->state->current_token->bookmark_name ]->start ) { 5592 return true; 5593 } 5594 } while ( $this->next_token() ); 5595 5596 return false; 5597 } 5598 5599 /** 5600 * Sets a bookmark in the HTML document. 5601 * 5602 * Bookmarks represent specific places or tokens in the HTML 5603 * document, such as a tag opener or closer. When applying 5604 * edits to a document, such as setting an attribute, the 5605 * text offsets of that token may shift; the bookmark is 5606 * kept updated with those shifts and remains stable unless 5607 * the entire span of text in which the token sits is removed. 5608 * 5609 * Release bookmarks when they are no longer needed. 5610 * 5611 * Example: 5612 * 5613 * <main><h2>Surprising fact you may not know!</h2></main> 5614 * ^ ^ 5615 * \-|-- this `H2` opener bookmark tracks the token 5616 * 5617 * <main class="clickbait"><h2>Surprising fact you may no… 5618 * ^ ^ 5619 * \-|-- it shifts with edits 5620 * 5621 * Bookmarks provide the ability to seek to a previously-scanned 5622 * place in the HTML document. This avoids the need to re-scan 5623 * the entire document. 5624 * 5625 * Example: 5626 * 5627 * <ul><li>One</li><li>Two</li><li>Three</li></ul> 5628 * ^^^^ 5629 * want to note this last item 5630 * 5631 * $p = new WP_HTML_Tag_Processor( $html ); 5632 * $in_list = false; 5633 * while ( $p->next_tag( array( 'tag_closers' => $in_list ? 'visit' : 'skip' ) ) ) { 5634 * if ( 'UL' === $p->get_tag() ) { 5635 * if ( $p->is_tag_closer() ) { 5636 * $in_list = false; 5637 * $p->set_bookmark( 'resume' ); 5638 * if ( $p->seek( 'last-li' ) ) { 5639 * $p->add_class( 'last-li' ); 5640 * } 5641 * $p->seek( 'resume' ); 5642 * $p->release_bookmark( 'last-li' ); 5643 * $p->release_bookmark( 'resume' ); 5644 * } else { 5645 * $in_list = true; 5646 * } 5647 * } 5648 * 5649 * if ( 'LI' === $p->get_tag() ) { 5650 * $p->set_bookmark( 'last-li' ); 5651 * } 5652 * } 5653 * 5654 * Bookmarks intentionally hide the internal string offsets 5655 * to which they refer. They are maintained internally as 5656 * updates are applied to the HTML document and therefore 5657 * retain their "position" - the location to which they 5658 * originally pointed. The inability to use bookmarks with 5659 * functions like `substr` is therefore intentional to guard 5660 * against accidentally breaking the HTML. 5661 * 5662 * Because bookmarks allocate memory and require processing 5663 * for every applied update, they are limited and require 5664 * a name. They should not be created with programmatically-made 5665 * names, such as "li_{$index}" with some loop. As a general 5666 * rule they should only be created with string-literal names 5667 * like "start-of-section" or "last-paragraph". 5668 * 5669 * Bookmarks are a powerful tool to enable complicated behavior. 5670 * Consider double-checking that you need this tool if you are 5671 * reaching for it, as inappropriate use could lead to broken 5672 * HTML structure or unwanted processing overhead. 5673 * 5674 * Bookmarks cannot be set on tokens that do no appear in the original 5675 * HTML text. For example, the HTML `<table><td>` stops at tags `TABLE`, 5676 * `TBODY`, `TR`, and `TD`. The `TBODY` and `TR` tags do not appear in 5677 * the original HTML and cannot be used as bookmarks. 5678 * 5679 * @since 6.4.0 5680 * 5681 * @param string $bookmark_name Identifies this particular bookmark. 5682 * @return bool Whether the bookmark was successfully created. 5683 */ 5684 public function set_bookmark( $bookmark_name ): bool { 5685 if ( $this->is_virtual() ) { 5686 _doing_it_wrong( 5687 __METHOD__, 5688 __( 'Cannot set bookmarks on tokens that do no appear in the original HTML text.' ), 5689 '6.8.0' 5690 ); 5691 return false; 5692 } 5693 return parent::set_bookmark( "_{$bookmark_name}" ); 5694 } 5695 5696 /** 5697 * Checks whether a bookmark with the given name exists. 5698 * 5699 * @since 6.5.0 5700 * 5701 * @param string $bookmark_name Name to identify a bookmark that potentially exists. 5702 * @return bool Whether that bookmark exists. 5703 */ 5704 public function has_bookmark( $bookmark_name ): bool { 5705 return parent::has_bookmark( "_{$bookmark_name}" ); 5706 } 5707 5708 /* 5709 * HTML Parsing Algorithms 5710 */ 5711 5712 /** 5713 * Closes a P element. 5714 * 5715 * @since 6.4.0 5716 * 5717 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. 5718 * 5719 * @see https://html.spec.whatwg.org/#close-a-p-element 5720 */ 5721 private function close_a_p_element(): void { 5722 $this->generate_implied_end_tags( 'P' ); 5723 $this->state->stack_of_open_elements->pop_until( 'P' ); 5724 } 5725 5726 /** 5727 * Closes elements that have implied end tags. 5728 * 5729 * @since 6.4.0 5730 * @since 6.7.0 Full spec support. 5731 * 5732 * @see https://html.spec.whatwg.org/#generate-implied-end-tags 5733 * 5734 * @param string|null $except_for_this_element Perform as if this element doesn't exist in the stack of open elements. 5735 */ 5736 private function generate_implied_end_tags( ?string $except_for_this_element = null ): void { 5737 $elements_with_implied_end_tags = array( 5738 'DD', 5739 'DT', 5740 'LI', 5741 'OPTGROUP', 5742 'OPTION', 5743 'P', 5744 'RB', 5745 'RP', 5746 'RT', 5747 'RTC', 5748 ); 5749 5750 $no_exclusions = ! isset( $except_for_this_element ); 5751 5752 while ( 5753 ( $no_exclusions || ! $this->state->stack_of_open_elements->current_node_is( $except_for_this_element ) ) && 5754 in_array( $this->state->stack_of_open_elements->current_node()->node_name, $elements_with_implied_end_tags, true ) 5755 ) { 5756 $this->state->stack_of_open_elements->pop(); 5757 } 5758 } 5759 5760 /** 5761 * Closes elements that have implied end tags, thoroughly. 5762 * 5763 * See the HTML specification for an explanation why this is 5764 * different from generating end tags in the normal sense. 5765 * 5766 * @since 6.4.0 5767 * @since 6.7.0 Full spec support. 5768 * 5769 * @see WP_HTML_Processor::generate_implied_end_tags 5770 * @see https://html.spec.whatwg.org/#generate-implied-end-tags 5771 */ 5772 private function generate_implied_end_tags_thoroughly(): void { 5773 $elements_with_implied_end_tags = array( 5774 'CAPTION', 5775 'COLGROUP', 5776 'DD', 5777 'DT', 5778 'LI', 5779 'OPTGROUP', 5780 'OPTION', 5781 'P', 5782 'RB', 5783 'RP', 5784 'RT', 5785 'RTC', 5786 'TBODY', 5787 'TD', 5788 'TFOOT', 5789 'TH', 5790 'THEAD', 5791 'TR', 5792 ); 5793 5794 while ( in_array( $this->state->stack_of_open_elements->current_node()->node_name, $elements_with_implied_end_tags, true ) ) { 5795 $this->state->stack_of_open_elements->pop(); 5796 } 5797 } 5798 5799 /** 5800 * Returns the adjusted current node. 5801 * 5802 * > The adjusted current node is the context element if the parser was created as 5803 * > part of the HTML fragment parsing algorithm and the stack of open elements 5804 * > has only one element in it (fragment case); otherwise, the adjusted current 5805 * > node is the current node. 5806 * 5807 * @see https://html.spec.whatwg.org/#adjusted-current-node 5808 * 5809 * @since 6.7.0 5810 * 5811 * @return WP_HTML_Token|null The adjusted current node. 5812 */ 5813 private function get_adjusted_current_node(): ?WP_HTML_Token { 5814 if ( isset( $this->context_node ) && 1 === $this->state->stack_of_open_elements->count() ) { 5815 return $this->context_node; 5816 } 5817 5818 return $this->state->stack_of_open_elements->current_node(); 5819 } 5820 5821 /** 5822 * Reconstructs the active formatting elements. 5823 * 5824 * > This has the effect of reopening all the formatting elements that were opened 5825 * > in the current body, cell, or caption (whichever is youngest) that haven't 5826 * > been explicitly closed. 5827 * 5828 * @since 6.4.0 5829 * 5830 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. 5831 * 5832 * @see https://html.spec.whatwg.org/#reconstruct-the-active-formatting-elements 5833 * 5834 * @return bool Whether any formatting elements needed to be reconstructed. 5835 */ 5836 private function reconstruct_active_formatting_elements(): bool { 5837 /* 5838 * > If there are no entries in the list of active formatting elements, then there is nothing 5839 * > to reconstruct; stop this algorithm. 5840 */ 5841 if ( 0 === $this->state->active_formatting_elements->count() ) { 5842 return false; 5843 } 5844 5845 $last_entry = $this->state->active_formatting_elements->current_node(); 5846 if ( 5847 5848 /* 5849 * > If the last (most recently added) entry in the list of active formatting elements is a marker; 5850 * > stop this algorithm. 5851 */ 5852 'marker' === $last_entry->node_name || 5853 5854 /* 5855 * > If the last (most recently added) entry in the list of active formatting elements is an 5856 * > element that is in the stack of open elements, then there is nothing to reconstruct; 5857 * > stop this algorithm. 5858 */ 5859 $this->state->stack_of_open_elements->contains_node( $last_entry ) 5860 ) { 5861 return false; 5862 } 5863 5864 $this->bail( 'Cannot reconstruct active formatting elements when advancing and rewinding is required.' ); 5865 } 5866 5867 /** 5868 * Runs the reset the insertion mode appropriately algorithm. 5869 * 5870 * @since 6.7.0 5871 * 5872 * @see https://html.spec.whatwg.org/multipage/parsing.html#reset-the-insertion-mode-appropriately 5873 */ 5874 private function reset_insertion_mode_appropriately(): void { 5875 // Set the first node. 5876 $first_node = null; 5877 foreach ( $this->state->stack_of_open_elements->walk_down() as $first_node ) { 5878 break; 5879 } 5880 5881 /* 5882 * > 1. Let _last_ be false. 5883 */ 5884 $last = false; 5885 foreach ( $this->state->stack_of_open_elements->walk_up() as $node ) { 5886 /* 5887 * > 2. Let _node_ be the last node in the stack of open elements. 5888 * > 3. _Loop_: If _node_ is the first node in the stack of open elements, then set _last_ 5889 * > to true, and, if the parser was created as part of the HTML fragment parsing 5890 * > algorithm (fragment case), set node to the context element passed to 5891 * > that algorithm. 5892 * > … 5893 */ 5894 if ( $node === $first_node ) { 5895 $last = true; 5896 if ( isset( $this->context_node ) ) { 5897 $node = $this->context_node; 5898 } 5899 } 5900 5901 // All of the following rules are for matching HTML elements. 5902 if ( 'html' !== $node->namespace ) { 5903 continue; 5904 } 5905 5906 switch ( $node->node_name ) { 5907 /* 5908 * > 4. If node is a `select` element, run these substeps: 5909 * > 1. If _last_ is true, jump to the step below labeled done. 5910 * > 2. Let _ancestor_ be _node_. 5911 * > 3. _Loop_: If _ancestor_ is the first node in the stack of open elements, 5912 * > jump to the step below labeled done. 5913 * > 4. Let ancestor be the node before ancestor in the stack of open elements. 5914 * > … 5915 * > 7. Jump back to the step labeled _loop_. 5916 * > 8. _Done_: Switch the insertion mode to "in select" and return. 5917 */ 5918 case 'SELECT': 5919 if ( ! $last ) { 5920 foreach ( $this->state->stack_of_open_elements->walk_up( $node ) as $ancestor ) { 5921 if ( 'html' !== $ancestor->namespace ) { 5922 continue; 5923 } 5924 5925 switch ( $ancestor->node_name ) { 5926 /* 5927 * > 5. If _ancestor_ is a `template` node, jump to the step below 5928 * > labeled _done_. 5929 */ 5930 case 'TEMPLATE': 5931 break 2; 5932 5933 /* 5934 * > 6. If _ancestor_ is a `table` node, switch the insertion mode to 5935 * > "in select in table" and return. 5936 */ 5937 case 'TABLE': 5938 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_SELECT_IN_TABLE; 5939 return; 5940 } 5941 } 5942 } 5943 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_SELECT; 5944 return; 5945 5946 /* 5947 * > 5. If _node_ is a `td` or `th` element and _last_ is false, then switch the 5948 * > insertion mode to "in cell" and return. 5949 */ 5950 case 'TD': 5951 case 'TH': 5952 if ( ! $last ) { 5953 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_CELL; 5954 return; 5955 } 5956 break; 5957 5958 /* 5959 * > 6. If _node_ is a `tr` element, then switch the insertion mode to "in row" 5960 * > and return. 5961 */ 5962 case 'TR': 5963 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_ROW; 5964 return; 5965 5966 /* 5967 * > 7. If _node_ is a `tbody`, `thead`, or `tfoot` element, then switch the 5968 * > insertion mode to "in table body" and return. 5969 */ 5970 case 'TBODY': 5971 case 'THEAD': 5972 case 'TFOOT': 5973 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE_BODY; 5974 return; 5975 5976 /* 5977 * > 8. If _node_ is a `caption` element, then switch the insertion mode to 5978 * > "in caption" and return. 5979 */ 5980 case 'CAPTION': 5981 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_CAPTION; 5982 return; 5983 5984 /* 5985 * > 9. If _node_ is a `colgroup` element, then switch the insertion mode to 5986 * > "in column group" and return. 5987 */ 5988 case 'COLGROUP': 5989 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_COLUMN_GROUP; 5990 return; 5991 5992 /* 5993 * > 10. If _node_ is a `table` element, then switch the insertion mode to 5994 * > "in table" and return. 5995 */ 5996 case 'TABLE': 5997 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE; 5998 return; 5999 6000 /* 6001 * > 11. If _node_ is a `template` element, then switch the insertion mode to the 6002 * > current template insertion mode and return. 6003 */ 6004 case 'TEMPLATE': 6005 $this->state->insertion_mode = end( $this->state->stack_of_template_insertion_modes ); 6006 return; 6007 6008 /* 6009 * > 12. If _node_ is a `head` element and _last_ is false, then switch the 6010 * > insertion mode to "in head" and return. 6011 */ 6012 case 'HEAD': 6013 if ( ! $last ) { 6014 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_HEAD; 6015 return; 6016 } 6017 break; 6018 6019 /* 6020 * > 13. If _node_ is a `body` element, then switch the insertion mode to "in body" 6021 * > and return. 6022 */ 6023 case 'BODY': 6024 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_BODY; 6025 return; 6026 6027 /* 6028 * > 14. If _node_ is a `frameset` element, then switch the insertion mode to 6029 * > "in frameset" and return. (fragment case) 6030 */ 6031 case 'FRAMESET': 6032 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_FRAMESET; 6033 return; 6034 6035 /* 6036 * > 15. If _node_ is an `html` element, run these substeps: 6037 * > 1. If the head element pointer is null, switch the insertion mode to 6038 * > "before head" and return. (fragment case) 6039 * > 2. Otherwise, the head element pointer is not null, switch the insertion 6040 * > mode to "after head" and return. 6041 */ 6042 case 'HTML': 6043 $this->state->insertion_mode = isset( $this->state->head_element ) 6044 ? WP_HTML_Processor_State::INSERTION_MODE_AFTER_HEAD 6045 : WP_HTML_Processor_State::INSERTION_MODE_BEFORE_HEAD; 6046 return; 6047 } 6048 } 6049 6050 /* 6051 * > 16. If _last_ is true, then switch the insertion mode to "in body" 6052 * > and return. (fragment case) 6053 * 6054 * This is only reachable if `$last` is true, as per the fragment parsing case. 6055 */ 6056 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_BODY; 6057 } 6058 6059 /** 6060 * Runs the adoption agency algorithm. 6061 * 6062 * @since 6.4.0 6063 * 6064 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. 6065 * 6066 * @see https://html.spec.whatwg.org/#adoption-agency-algorithm 6067 */ 6068 private function run_adoption_agency_algorithm(): void { 6069 $budget = 1000; 6070 $subject = $this->get_tag(); 6071 $current_node = $this->state->stack_of_open_elements->current_node(); 6072 6073 if ( 6074 // > If the current node is an HTML element whose tag name is subject 6075 $current_node && $subject === $current_node->node_name && 6076 // > the current node is not in the list of active formatting elements 6077 ! $this->state->active_formatting_elements->contains_node( $current_node ) 6078 ) { 6079 $this->state->stack_of_open_elements->pop(); 6080 return; 6081 } 6082 6083 $outer_loop_counter = 0; 6084 while ( $budget-- > 0 ) { 6085 if ( $outer_loop_counter++ >= 8 ) { 6086 return; 6087 } 6088 6089 /* 6090 * > Let formatting element be the last element in the list of active formatting elements that: 6091 * > - is between the end of the list and the last marker in the list, 6092 * > if any, or the start of the list otherwise, 6093 * > - and has the tag name subject. 6094 */ 6095 $formatting_element = null; 6096 foreach ( $this->state->active_formatting_elements->walk_up() as $item ) { 6097 if ( 'marker' === $item->node_name ) { 6098 break; 6099 } 6100 6101 if ( $subject === $item->node_name ) { 6102 $formatting_element = $item; 6103 break; 6104 } 6105 } 6106 6107 // > If there is no such element, then return and instead act as described in the "any other end tag" entry above. 6108 if ( null === $formatting_element ) { 6109 $this->bail( 'Cannot run adoption agency when "any other end tag" is required.' ); 6110 } 6111 6112 // > 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. 6113 if ( ! $this->state->stack_of_open_elements->contains_node( $formatting_element ) ) { 6114 $this->state->active_formatting_elements->remove_node( $formatting_element ); 6115 return; 6116 } 6117 6118 // > If formatting element is in the stack of open elements, but the element is not in scope, then this is a parse error; return. 6119 if ( ! $this->state->stack_of_open_elements->has_element_in_scope( $formatting_element->node_name ) ) { 6120 return; 6121 } 6122 6123 /* 6124 * > Let furthest block be the topmost node in the stack of open elements that is lower in the stack 6125 * > than formatting element, and is an element in the special category. There might not be one. 6126 */ 6127 $is_above_formatting_element = true; 6128 $furthest_block = null; 6129 foreach ( $this->state->stack_of_open_elements->walk_down() as $item ) { 6130 if ( $is_above_formatting_element && $formatting_element->bookmark_name !== $item->bookmark_name ) { 6131 continue; 6132 } 6133 6134 if ( $is_above_formatting_element ) { 6135 $is_above_formatting_element = false; 6136 continue; 6137 } 6138 6139 if ( self::is_special( $item ) ) { 6140 $furthest_block = $item; 6141 break; 6142 } 6143 } 6144 6145 /* 6146 * > If there is no furthest block, then the UA must first pop all the nodes from the bottom of the 6147 * > stack of open elements, from the current node up to and including formatting element, then 6148 * > remove formatting element from the list of active formatting elements, and finally return. 6149 */ 6150 if ( null === $furthest_block ) { 6151 foreach ( $this->state->stack_of_open_elements->walk_up() as $item ) { 6152 $this->state->stack_of_open_elements->pop(); 6153 6154 if ( $formatting_element->bookmark_name === $item->bookmark_name ) { 6155 $this->state->active_formatting_elements->remove_node( $formatting_element ); 6156 return; 6157 } 6158 } 6159 } 6160 6161 $this->bail( 'Cannot extract common ancestor in adoption agency algorithm.' ); 6162 } 6163 6164 $this->bail( 'Cannot run adoption agency when looping required.' ); 6165 } 6166 6167 /** 6168 * Runs the "close the cell" algorithm. 6169 * 6170 * > Where the steps above say to close the cell, they mean to run the following algorithm: 6171 * > 1. Generate implied end tags. 6172 * > 2. If the current node is not now a td element or a th element, then this is a parse error. 6173 * > 3. Pop elements from the stack of open elements stack until a td element or a th element has been popped from the stack. 6174 * > 4. Clear the list of active formatting elements up to the last marker. 6175 * > 5. Switch the insertion mode to "in row". 6176 * 6177 * @see https://html.spec.whatwg.org/multipage/parsing.html#close-the-cell 6178 * 6179 * @since 6.7.0 6180 */ 6181 private function close_cell(): void { 6182 $this->generate_implied_end_tags(); 6183 // @todo Parse error if the current node is a "td" or "th" element. 6184 foreach ( $this->state->stack_of_open_elements->walk_up() as $element ) { 6185 $this->state->stack_of_open_elements->pop(); 6186 if ( 'TD' === $element->node_name || 'TH' === $element->node_name ) { 6187 break; 6188 } 6189 } 6190 $this->state->active_formatting_elements->clear_up_to_last_marker(); 6191 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_ROW; 6192 } 6193 6194 /** 6195 * Inserts an HTML element on the stack of open elements. 6196 * 6197 * @since 6.4.0 6198 * 6199 * @see https://html.spec.whatwg.org/#insert-a-foreign-element 6200 * 6201 * @param WP_HTML_Token $token Name of bookmark pointing to element in original input HTML. 6202 */ 6203 private function insert_html_element( WP_HTML_Token $token ): void { 6204 $this->state->stack_of_open_elements->push( $token ); 6205 } 6206 6207 /** 6208 * Inserts a foreign element on to the stack of open elements. 6209 * 6210 * @since 6.7.0 6211 * 6212 * @see https://html.spec.whatwg.org/#insert-a-foreign-element 6213 * 6214 * @param WP_HTML_Token $token Insert this token. The token's namespace and 6215 * insertion point will be updated correctly. 6216 * @param bool $only_add_to_element_stack Whether to skip the "insert an element at the adjusted 6217 * insertion location" algorithm when adding this element. 6218 */ 6219 private function insert_foreign_element( WP_HTML_Token $token, bool $only_add_to_element_stack ): void { 6220 $adjusted_current_node = $this->get_adjusted_current_node(); 6221 6222 $token->namespace = $adjusted_current_node ? $adjusted_current_node->namespace : 'html'; 6223 6224 if ( $this->is_mathml_integration_point() ) { 6225 $token->integration_node_type = 'math'; 6226 } elseif ( $this->is_html_integration_point() ) { 6227 $token->integration_node_type = 'html'; 6228 } 6229 6230 if ( false === $only_add_to_element_stack ) { 6231 /* 6232 * @todo Implement the "appropriate place for inserting a node" and the 6233 * "insert an element at the adjusted insertion location" algorithms. 6234 * 6235 * These algorithms mostly impacts DOM tree construction and not the HTML API. 6236 * Here, there's no DOM node onto which the element will be appended, so the 6237 * parser will skip this step. 6238 * 6239 * @see https://html.spec.whatwg.org/#insert-an-element-at-the-adjusted-insertion-location 6240 */ 6241 } 6242 6243 $this->insert_html_element( $token ); 6244 } 6245 6246 /** 6247 * Inserts a virtual element on the stack of open elements. 6248 * 6249 * @since 6.7.0 6250 * 6251 * @param string $token_name Name of token to create and insert into the stack of open elements. 6252 * @param string|null $bookmark_name Optional. Name to give bookmark for created virtual node. 6253 * Defaults to auto-creating a bookmark name. 6254 * @return WP_HTML_Token Newly-created virtual token. 6255 */ 6256 private function insert_virtual_node( $token_name, $bookmark_name = null ): WP_HTML_Token { 6257 $here = $this->bookmarks[ $this->state->current_token->bookmark_name ]; 6258 $name = $bookmark_name ?? $this->bookmark_token(); 6259 6260 $this->bookmarks[ $name ] = new WP_HTML_Span( $here->start, 0 ); 6261 6262 $token = new WP_HTML_Token( $name, $token_name, false ); 6263 $this->insert_html_element( $token ); 6264 return $token; 6265 } 6266 6267 /* 6268 * HTML Specification Helpers 6269 */ 6270 6271 /** 6272 * Indicates if the current token is a MathML integration point. 6273 * 6274 * @since 6.7.0 6275 * 6276 * @see https://html.spec.whatwg.org/#mathml-text-integration-point 6277 * 6278 * @return bool Whether the current token is a MathML integration point. 6279 */ 6280 private function is_mathml_integration_point(): bool { 6281 $current_token = $this->state->current_token; 6282 if ( ! isset( $current_token ) ) { 6283 return false; 6284 } 6285 6286 if ( 'math' !== $current_token->namespace || 'M' !== $current_token->node_name[0] ) { 6287 return false; 6288 } 6289 6290 $tag_name = $current_token->node_name; 6291 6292 return ( 6293 'MI' === $tag_name || 6294 'MO' === $tag_name || 6295 'MN' === $tag_name || 6296 'MS' === $tag_name || 6297 'MTEXT' === $tag_name 6298 ); 6299 } 6300 6301 /** 6302 * Indicates if the current token is an HTML integration point. 6303 * 6304 * Note that this method must be an instance method with access 6305 * to the current token, since it needs to examine the attributes 6306 * of the currently-matched tag, if it's in the MathML namespace. 6307 * Otherwise it would be required to scan the HTML and ensure that 6308 * no other accounting is overlooked. 6309 * 6310 * @since 6.7.0 6311 * 6312 * @see https://html.spec.whatwg.org/#html-integration-point 6313 * 6314 * @return bool Whether the current token is an HTML integration point. 6315 */ 6316 private function is_html_integration_point(): bool { 6317 $current_token = $this->state->current_token; 6318 if ( ! isset( $current_token ) ) { 6319 return false; 6320 } 6321 6322 if ( 'html' === $current_token->namespace ) { 6323 return false; 6324 } 6325 6326 $tag_name = $current_token->node_name; 6327 6328 if ( 'svg' === $current_token->namespace ) { 6329 return ( 6330 'DESC' === $tag_name || 6331 'FOREIGNOBJECT' === $tag_name || 6332 'TITLE' === $tag_name 6333 ); 6334 } 6335 6336 if ( 'math' === $current_token->namespace ) { 6337 if ( 'ANNOTATION-XML' !== $tag_name ) { 6338 return false; 6339 } 6340 6341 $encoding = $this->get_attribute( 'encoding' ); 6342 6343 return ( 6344 is_string( $encoding ) && 6345 ( 6346 0 === strcasecmp( $encoding, 'application/xhtml+xml' ) || 6347 0 === strcasecmp( $encoding, 'text/html' ) 6348 ) 6349 ); 6350 } 6351 6352 $this->bail( 'Should not have reached end of HTML Integration Point detection: check HTML API code.' ); 6353 // This unnecessary return prevents tools from inaccurately reporting type errors. 6354 return false; 6355 } 6356 6357 /** 6358 * Returns whether an element of a given name is in the HTML special category. 6359 * 6360 * @since 6.4.0 6361 * 6362 * @see https://html.spec.whatwg.org/#special 6363 * 6364 * @param WP_HTML_Token|string $tag_name Node to check, or only its name if in the HTML namespace. 6365 * @return bool Whether the element of the given name is in the special category. 6366 */ 6367 public static function is_special( $tag_name ): bool { 6368 if ( is_string( $tag_name ) ) { 6369 $tag_name = strtoupper( $tag_name ); 6370 } else { 6371 $tag_name = 'html' === $tag_name->namespace 6372 ? strtoupper( $tag_name->node_name ) 6373 : "{$tag_name->namespace} {$tag_name->node_name}"; 6374 } 6375 6376 return ( 6377 'ADDRESS' === $tag_name || 6378 'APPLET' === $tag_name || 6379 'AREA' === $tag_name || 6380 'ARTICLE' === $tag_name || 6381 'ASIDE' === $tag_name || 6382 'BASE' === $tag_name || 6383 'BASEFONT' === $tag_name || 6384 'BGSOUND' === $tag_name || 6385 'BLOCKQUOTE' === $tag_name || 6386 'BODY' === $tag_name || 6387 'BR' === $tag_name || 6388 'BUTTON' === $tag_name || 6389 'CAPTION' === $tag_name || 6390 'CENTER' === $tag_name || 6391 'COL' === $tag_name || 6392 'COLGROUP' === $tag_name || 6393 'DD' === $tag_name || 6394 'DETAILS' === $tag_name || 6395 'DIR' === $tag_name || 6396 'DIV' === $tag_name || 6397 'DL' === $tag_name || 6398 'DT' === $tag_name || 6399 'EMBED' === $tag_name || 6400 'FIELDSET' === $tag_name || 6401 'FIGCAPTION' === $tag_name || 6402 'FIGURE' === $tag_name || 6403 'FOOTER' === $tag_name || 6404 'FORM' === $tag_name || 6405 'FRAME' === $tag_name || 6406 'FRAMESET' === $tag_name || 6407 'H1' === $tag_name || 6408 'H2' === $tag_name || 6409 'H3' === $tag_name || 6410 'H4' === $tag_name || 6411 'H5' === $tag_name || 6412 'H6' === $tag_name || 6413 'HEAD' === $tag_name || 6414 'HEADER' === $tag_name || 6415 'HGROUP' === $tag_name || 6416 'HR' === $tag_name || 6417 'HTML' === $tag_name || 6418 'IFRAME' === $tag_name || 6419 'IMG' === $tag_name || 6420 'INPUT' === $tag_name || 6421 'KEYGEN' === $tag_name || 6422 'LI' === $tag_name || 6423 'LINK' === $tag_name || 6424 'LISTING' === $tag_name || 6425 'MAIN' === $tag_name || 6426 'MARQUEE' === $tag_name || 6427 'MENU' === $tag_name || 6428 'META' === $tag_name || 6429 'NAV' === $tag_name || 6430 'NOEMBED' === $tag_name || 6431 'NOFRAMES' === $tag_name || 6432 'NOSCRIPT' === $tag_name || 6433 'OBJECT' === $tag_name || 6434 'OL' === $tag_name || 6435 'P' === $tag_name || 6436 'PARAM' === $tag_name || 6437 'PLAINTEXT' === $tag_name || 6438 'PRE' === $tag_name || 6439 'SCRIPT' === $tag_name || 6440 'SEARCH' === $tag_name || 6441 'SECTION' === $tag_name || 6442 'SELECT' === $tag_name || 6443 'SOURCE' === $tag_name || 6444 'STYLE' === $tag_name || 6445 'SUMMARY' === $tag_name || 6446 'TABLE' === $tag_name || 6447 'TBODY' === $tag_name || 6448 'TD' === $tag_name || 6449 'TEMPLATE' === $tag_name || 6450 'TEXTAREA' === $tag_name || 6451 'TFOOT' === $tag_name || 6452 'TH' === $tag_name || 6453 'THEAD' === $tag_name || 6454 'TITLE' === $tag_name || 6455 'TR' === $tag_name || 6456 'TRACK' === $tag_name || 6457 'UL' === $tag_name || 6458 'WBR' === $tag_name || 6459 'XMP' === $tag_name || 6460 6461 // MathML. 6462 'math MI' === $tag_name || 6463 'math MO' === $tag_name || 6464 'math MN' === $tag_name || 6465 'math MS' === $tag_name || 6466 'math MTEXT' === $tag_name || 6467 'math ANNOTATION-XML' === $tag_name || 6468 6469 // SVG. 6470 'svg DESC' === $tag_name || 6471 'svg FOREIGNOBJECT' === $tag_name || 6472 'svg TITLE' === $tag_name 6473 ); 6474 } 6475 6476 /** 6477 * Returns whether a given element is an HTML Void Element 6478 * 6479 * > area, base, br, col, embed, hr, img, input, link, meta, source, track, wbr 6480 * 6481 * @since 6.4.0 6482 * 6483 * @see https://html.spec.whatwg.org/#void-elements 6484 * 6485 * @param string $tag_name Name of HTML tag to check. 6486 * @return bool Whether the given tag is an HTML Void Element. 6487 */ 6488 public static function is_void( $tag_name ): bool { 6489 $tag_name = strtoupper( $tag_name ); 6490 6491 return ( 6492 'AREA' === $tag_name || 6493 'BASE' === $tag_name || 6494 'BASEFONT' === $tag_name || // Obsolete but still treated as void. 6495 'BGSOUND' === $tag_name || // Obsolete but still treated as void. 6496 'BR' === $tag_name || 6497 'COL' === $tag_name || 6498 'EMBED' === $tag_name || 6499 'FRAME' === $tag_name || 6500 'HR' === $tag_name || 6501 'IMG' === $tag_name || 6502 'INPUT' === $tag_name || 6503 'KEYGEN' === $tag_name || // Obsolete but still treated as void. 6504 'LINK' === $tag_name || 6505 'META' === $tag_name || 6506 'PARAM' === $tag_name || // Obsolete but still treated as void. 6507 'SOURCE' === $tag_name || 6508 'TRACK' === $tag_name || 6509 'WBR' === $tag_name 6510 ); 6511 } 6512 6513 /** 6514 * Gets an encoding from a given string. 6515 * 6516 * This is an algorithm defined in the WHAT-WG specification. 6517 * 6518 * Example: 6519 * 6520 * 'UTF-8' === self::get_encoding( 'utf8' ); 6521 * 'UTF-8' === self::get_encoding( " \tUTF-8 " ); 6522 * null === self::get_encoding( 'UTF-7' ); 6523 * null === self::get_encoding( 'utf8; charset=' ); 6524 * 6525 * @see https://encoding.spec.whatwg.org/#concept-encoding-get 6526 * 6527 * @todo As this parser only supports UTF-8, only the UTF-8 6528 * encodings are detected. Add more as desired, but the 6529 * parser will bail on non-UTF-8 encodings. 6530 * 6531 * @since 6.7.0 6532 * 6533 * @param string $label A string which may specify a known encoding. 6534 * @return string|null Known encoding if matched, otherwise null. 6535 */ 6536 protected static function get_encoding( string $label ): ?string { 6537 /* 6538 * > Remove any leading and trailing ASCII whitespace from label. 6539 */ 6540 $label = trim( $label, " \t\f\r\n" ); 6541 6542 /* 6543 * > If label is an ASCII case-insensitive match for any of the labels listed in the 6544 * > table below, then return the corresponding encoding; otherwise return failure. 6545 */ 6546 switch ( strtolower( $label ) ) { 6547 case 'unicode-1-1-utf-8': 6548 case 'unicode11utf8': 6549 case 'unicode20utf8': 6550 case 'utf-8': 6551 case 'utf8': 6552 case 'x-unicode20utf8': 6553 return 'UTF-8'; 6554 6555 default: 6556 return null; 6557 } 6558 } 6559 6560 /* 6561 * Constants that would pollute the top of the class if they were found there. 6562 */ 6563 6564 /** 6565 * Indicates that the next HTML token should be parsed and processed. 6566 * 6567 * @since 6.4.0 6568 * 6569 * @var string 6570 */ 6571 const PROCESS_NEXT_NODE = 'process-next-node'; 6572 6573 /** 6574 * Indicates that the current HTML token should be reprocessed in the newly-selected insertion mode. 6575 * 6576 * @since 6.4.0 6577 * 6578 * @var string 6579 */ 6580 const REPROCESS_CURRENT_NODE = 'reprocess-current-node'; 6581 6582 /** 6583 * Indicates that the current HTML token should be processed without advancing the parser. 6584 * 6585 * @since 6.5.0 6586 * 6587 * @var string 6588 */ 6589 const PROCESS_CURRENT_NODE = 'process-current-node'; 6590 6591 /** 6592 * Indicates that the parser encountered unsupported markup and has bailed. 6593 * 6594 * @since 6.4.0 6595 * 6596 * @var string 6597 */ 6598 const ERROR_UNSUPPORTED = 'unsupported'; 6599 6600 /** 6601 * Indicates that the parser encountered more HTML tokens than it 6602 * was able to process and has bailed. 6603 * 6604 * @since 6.4.0 6605 * 6606 * @var string 6607 */ 6608 const ERROR_EXCEEDED_MAX_BOOKMARKS = 'exceeded-max-bookmarks'; 6609 6610 /** 6611 * Unlock code that must be passed into the constructor to create this class. 6612 * 6613 * This class extends the WP_HTML_Tag_Processor, which has a public class 6614 * constructor. Therefore, it's not possible to have a private constructor here. 6615 * 6616 * This unlock code is used to ensure that anyone calling the constructor is 6617 * doing so with a full understanding that it's intended to be a private API. 6618 * 6619 * @access private 6620 */ 6621 const CONSTRUCTOR_UNLOCK_CODE = 'Use WP_HTML_Processor::create_fragment() instead of calling the class constructor directly.'; 6622 }
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| Generated : Tue Dec 24 08:20:01 2024 | Cross-referenced by PHPXref |