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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 * The parser does not implement the "maybe clone an option into selectedcontent" algorithm. 139 * SELECTEDCONTENT elements may not reflect the actual selected content. 140 * 141 * @since 6.4.0 142 * 143 * @see WP_HTML_Tag_Processor 144 * @link https://html.spec.whatwg.org/ 145 * @phpstan-consistent-constructor 146 */ 147 class WP_HTML_Processor extends WP_HTML_Tag_Processor { 148 /** 149 * The maximum number of bookmarks allowed to exist at any given time. 150 * 151 * HTML processing requires more bookmarks than basic tag processing, 152 * so this class constant from the Tag Processor is overwritten. 153 * 154 * @since 6.4.0 155 * @since 7.0.0 Increased from 100 to 10,000 156 * 157 * @var int 158 */ 159 const MAX_BOOKMARKS = 10_000; 160 161 /** 162 * Holds the working state of the parser, including the stack of 163 * open elements and the stack of active formatting elements. 164 * 165 * Initialized in the constructor. 166 * 167 * @since 6.4.0 168 * 169 * @var WP_HTML_Processor_State 170 */ 171 private $state; 172 173 /** 174 * Used to create unique bookmark names. 175 * 176 * This class sets a bookmark for every tag in the HTML document that it encounters. 177 * The bookmark name is auto-generated and increments, starting with `1`. These are 178 * internal bookmarks and are automatically released when the referring WP_HTML_Token 179 * goes out of scope and is garbage-collected. 180 * 181 * @since 6.4.0 182 * 183 * @see WP_HTML_Processor::$release_internal_bookmark_on_destruct 184 * 185 * @var int 186 */ 187 private $bookmark_counter = 0; 188 189 /** 190 * Stores an explanation for why something failed, if it did. 191 * 192 * @see self::get_last_error 193 * 194 * @since 6.4.0 195 * 196 * @var string|null 197 */ 198 private $last_error = null; 199 200 /** 201 * Stores context for why the parser bailed on unsupported HTML, if it did. 202 * 203 * @see self::get_unsupported_exception 204 * 205 * @since 6.7.0 206 * 207 * @var WP_HTML_Unsupported_Exception|null 208 */ 209 private $unsupported_exception = null; 210 211 /** 212 * Releases a bookmark when PHP garbage-collects its wrapping WP_HTML_Token instance. 213 * 214 * This function is created inside the class constructor so that it can be passed to 215 * the stack of open elements and the stack of active formatting elements without 216 * exposing it as a public method on the class. 217 * 218 * @since 6.4.0 219 * 220 * @var Closure|null 221 */ 222 private $release_internal_bookmark_on_destruct = null; 223 224 /** 225 * Stores stack events which arise during parsing of the 226 * HTML document, which will then supply the "match" events. 227 * 228 * @since 6.6.0 229 * 230 * @var WP_HTML_Stack_Event[] 231 */ 232 private $element_queue = array(); 233 234 /** 235 * Stores the current breadcrumbs. 236 * 237 * @since 6.7.0 238 * 239 * @var string[] 240 */ 241 private $breadcrumbs = array(); 242 243 /** 244 * Current stack event, if set, representing a matched token. 245 * 246 * Because the parser may internally point to a place further along in a document 247 * than the nodes which have already been processed (some "virtual" nodes may have 248 * appeared while scanning the HTML document), this will point at the "current" node 249 * being processed. It comes from the front of the element queue. 250 * 251 * @since 6.6.0 252 * 253 * @var WP_HTML_Stack_Event|null 254 */ 255 private $current_element = null; 256 257 /** 258 * Context node if created as a fragment parser. 259 * 260 * @var WP_HTML_Token|null 261 */ 262 private $context_node = null; 263 264 /* 265 * Public Interface Functions 266 */ 267 268 /** 269 * Creates an HTML processor in the fragment parsing mode. 270 * 271 * Use this for cases where you are processing chunks of HTML that 272 * will be found within a bigger HTML document, such as rendered 273 * block output that exists within a post, `the_content` inside a 274 * rendered site layout. 275 * 276 * Fragment parsing occurs within a context, which is an HTML element 277 * that the document will eventually be placed in. It becomes important 278 * when special elements have different rules than others, such as inside 279 * a TEXTAREA or a TITLE tag where things that look like tags are text, 280 * or inside a SCRIPT tag where things that look like HTML syntax are JS. 281 * 282 * The context value should be a representation of the tag into which the 283 * HTML is found. For most cases this will be the body element. The HTML 284 * form is provided because a context element may have attributes that 285 * impact the parse, such as with a SCRIPT tag and its `type` attribute. 286 * 287 * ## Current HTML Support 288 * 289 * - The only supported context is `<body>`, which is the default value. 290 * - The only supported document encoding is `UTF-8`, which is the default value. 291 * 292 * @since 6.4.0 293 * @since 6.6.0 Returns `static` instead of `self` so it can create subclass instances. 294 * 295 * @param string $html Input HTML fragment to process. 296 * @param string $context Context element for the fragment, must be default of `<body>`. 297 * @param string $encoding Text encoding of the document; must be default of 'UTF-8'. 298 * @return static|null The created processor if successful, otherwise null. 299 */ 300 public static function create_fragment( $html, $context = '<body>', $encoding = 'UTF-8' ) { 301 if ( '<body>' !== $context || 'UTF-8' !== $encoding ) { 302 return null; 303 } 304 305 if ( ! is_string( $html ) ) { 306 _doing_it_wrong( 307 __METHOD__, 308 __( 'The HTML parameter must be a string.' ), 309 '6.9.0' 310 ); 311 return null; 312 } 313 314 $context_processor = static::create_full_parser( "<!DOCTYPE html>{$context}", $encoding ); 315 if ( null === $context_processor ) { 316 return null; 317 } 318 319 while ( $context_processor->next_tag() ) { 320 if ( ! $context_processor->is_virtual() ) { 321 $context_processor->set_bookmark( 'final_node' ); 322 } 323 } 324 325 if ( 326 ! $context_processor->has_bookmark( 'final_node' ) || 327 ! $context_processor->seek( 'final_node' ) 328 ) { 329 _doing_it_wrong( __METHOD__, __( 'No valid context element was detected.' ), '6.8.0' ); 330 return null; 331 } 332 333 return $context_processor->create_fragment_at_current_node( $html ); 334 } 335 336 /** 337 * Creates an HTML processor in the full parsing mode. 338 * 339 * It's likely that a fragment parser is more appropriate, unless sending an 340 * entire HTML document from start to finish. Consider a fragment parser with 341 * a context node of `<body>`. 342 * 343 * UTF-8 is the only allowed encoding. If working with a document that 344 * isn't UTF-8, first convert the document to UTF-8, then pass in the 345 * converted HTML. 346 * 347 * @since 6.7.0 348 * 349 * @param string $html Input HTML document to process. 350 * @param string|null $known_definite_encoding Optional. If provided, specifies the charset used 351 * in the input byte stream. Currently must be UTF-8. 352 * @return static|null The created processor if successful, otherwise null. 353 */ 354 public static function create_full_parser( $html, $known_definite_encoding = 'UTF-8' ) { 355 if ( 'UTF-8' !== $known_definite_encoding ) { 356 return null; 357 } 358 if ( ! is_string( $html ) ) { 359 _doing_it_wrong( 360 __METHOD__, 361 __( 'The HTML parameter must be a string.' ), 362 '6.9.0' 363 ); 364 return null; 365 } 366 367 $processor = new static( $html, self::CONSTRUCTOR_UNLOCK_CODE ); 368 $processor->state->encoding = $known_definite_encoding; 369 $processor->state->encoding_confidence = 'certain'; 370 371 return $processor; 372 } 373 374 /** 375 * Constructor. 376 * 377 * Do not use this method. Use the static creator methods instead. 378 * 379 * @access private 380 * 381 * @since 6.4.0 382 * 383 * @see WP_HTML_Processor::create_fragment() 384 * 385 * @param string $html HTML to process. 386 * @param string|null $use_the_static_create_methods_instead This constructor should not be called manually. 387 */ 388 public function __construct( $html, $use_the_static_create_methods_instead = null ) { 389 parent::__construct( $html ); 390 391 if ( self::CONSTRUCTOR_UNLOCK_CODE !== $use_the_static_create_methods_instead ) { 392 _doing_it_wrong( 393 __METHOD__, 394 sprintf( 395 /* translators: %s: WP_HTML_Processor::create_fragment(). */ 396 __( 'Call %s to create an HTML Processor instead of calling the constructor directly.' ), 397 '<code>WP_HTML_Processor::create_fragment()</code>' 398 ), 399 '6.4.0' 400 ); 401 } 402 403 $this->state = new WP_HTML_Processor_State(); 404 405 $this->state->stack_of_open_elements->set_push_handler( 406 function ( WP_HTML_Token $token ): void { 407 $is_virtual = ! isset( $this->state->current_token ) || $this->is_tag_closer(); 408 $same_node = isset( $this->state->current_token ) && $token->node_name === $this->state->current_token->node_name; 409 $provenance = ( ! $same_node || $is_virtual ) ? 'virtual' : 'real'; 410 $this->element_queue[] = new WP_HTML_Stack_Event( $token, WP_HTML_Stack_Event::PUSH, $provenance ); 411 412 $this->change_parsing_namespace( $token->integration_node_type ? 'html' : $token->namespace ); 413 } 414 ); 415 416 $this->state->stack_of_open_elements->set_pop_handler( 417 function ( WP_HTML_Token $token ): void { 418 $is_virtual = ! isset( $this->state->current_token ) || ! $this->is_tag_closer(); 419 $same_node = isset( $this->state->current_token ) && $token->node_name === $this->state->current_token->node_name; 420 $provenance = ( ! $same_node || $is_virtual ) ? 'virtual' : 'real'; 421 $this->element_queue[] = new WP_HTML_Stack_Event( $token, WP_HTML_Stack_Event::POP, $provenance ); 422 423 $adjusted_current_node = $this->get_adjusted_current_node(); 424 425 if ( $adjusted_current_node ) { 426 $this->change_parsing_namespace( $adjusted_current_node->integration_node_type ? 'html' : $adjusted_current_node->namespace ); 427 } else { 428 $this->change_parsing_namespace( 'html' ); 429 } 430 } 431 ); 432 433 /* 434 * Create this wrapper so that it's possible to pass 435 * a private method into WP_HTML_Token classes without 436 * exposing it to any public API. 437 */ 438 $this->release_internal_bookmark_on_destruct = function ( string $name ): void { 439 parent::release_bookmark( $name ); 440 }; 441 } 442 443 /** 444 * Creates a fragment processor at the current node. 445 * 446 * HTML Fragment parsing always happens with a context node. HTML Fragment Processors can be 447 * instantiated with a `BODY` context node via `WP_HTML_Processor::create_fragment( $html )`. 448 * 449 * The context node may impact how a fragment of HTML is parsed. For example, consider the HTML 450 * fragment `<td />Inside TD?</td>`. 451 * 452 * A BODY context node will produce the following tree: 453 * 454 * └─#text Inside TD? 455 * 456 * Notice that the `<td>` tags are completely ignored. 457 * 458 * Compare that with an SVG context node that produces the following tree: 459 * 460 * ├─svg:td 461 * └─#text Inside TD? 462 * 463 * Here, a `td` node in the `svg` namespace is created, and its self-closing flag is respected. 464 * This is a peculiarity of parsing HTML in foreign content like SVG. 465 * 466 * Finally, consider the tree produced with a TABLE context node: 467 * 468 * └─TBODY 469 * └─TR 470 * └─TD 471 * └─#text Inside TD? 472 * 473 * These examples demonstrate how important the context node may be when processing an HTML 474 * fragment. Special care must be taken when processing fragments that are expected to appear 475 * in specific contexts. SVG and TABLE are good examples, but there are others. 476 * 477 * @see https://html.spec.whatwg.org/multipage/parsing.html#html-fragment-parsing-algorithm 478 * 479 * @since 6.8.0 480 * 481 * @param string $html Input HTML fragment to process. 482 * @return static|null The created processor if successful, otherwise null. 483 */ 484 private function create_fragment_at_current_node( string $html ) { 485 if ( $this->get_token_type() !== '#tag' || $this->is_tag_closer() ) { 486 _doing_it_wrong( 487 __METHOD__, 488 __( 'The context element must be a start tag.' ), 489 '6.8.0' 490 ); 491 return null; 492 } 493 494 $tag_name = $this->current_element->token->node_name; 495 $namespace = $this->current_element->token->namespace; 496 497 if ( 'html' === $namespace && self::is_void( $tag_name ) ) { 498 _doing_it_wrong( 499 __METHOD__, 500 sprintf( 501 // translators: %s: A tag name like INPUT or BR. 502 __( 'The context element cannot be a void element, found "%s".' ), 503 $tag_name 504 ), 505 '6.8.0' 506 ); 507 return null; 508 } 509 510 /* 511 * Prevent creating fragments at nodes that require a special tokenizer state. 512 * This is unsupported by the HTML Processor. 513 */ 514 if ( 515 'html' === $namespace && 516 in_array( $tag_name, array( 'IFRAME', 'NOEMBED', 'NOFRAMES', 'SCRIPT', 'STYLE', 'TEXTAREA', 'TITLE', 'XMP', 'PLAINTEXT' ), true ) 517 ) { 518 _doing_it_wrong( 519 __METHOD__, 520 sprintf( 521 // translators: %s: A tag name like IFRAME or TEXTAREA. 522 __( 'The context element "%s" is not supported.' ), 523 $tag_name 524 ), 525 '6.8.0' 526 ); 527 return null; 528 } 529 530 $fragment_processor = new static( $html, self::CONSTRUCTOR_UNLOCK_CODE ); 531 532 $fragment_processor->compat_mode = $this->compat_mode; 533 534 // @todo Create "fake" bookmarks for non-existent but implied nodes. 535 $fragment_processor->bookmarks['root-node'] = new WP_HTML_Span( 0, 0 ); 536 $root_node = new WP_HTML_Token( 537 'root-node', 538 'HTML', 539 false 540 ); 541 $fragment_processor->state->stack_of_open_elements->push( $root_node ); 542 543 $fragment_processor->bookmarks['context-node'] = new WP_HTML_Span( 0, 0 ); 544 $fragment_processor->context_node = clone $this->current_element->token; 545 $fragment_processor->context_node->bookmark_name = 'context-node'; 546 $fragment_processor->context_node->on_destroy = null; 547 548 $fragment_processor->breadcrumbs = array( 'HTML', $fragment_processor->context_node->node_name ); 549 550 if ( 'TEMPLATE' === $fragment_processor->context_node->node_name ) { 551 $fragment_processor->state->stack_of_template_insertion_modes[] = WP_HTML_Processor_State::INSERTION_MODE_IN_TEMPLATE; 552 } 553 554 $fragment_processor->reset_insertion_mode_appropriately(); 555 556 /* 557 * > Set the parser's form element pointer to the nearest node to the context element that 558 * > is a form element (going straight up the ancestor chain, and including the element 559 * > itself, if it is a form element), if any. (If there is no such form element, the 560 * > form element pointer keeps its initial value, null.) 561 */ 562 foreach ( $this->state->stack_of_open_elements->walk_up() as $element ) { 563 if ( 'FORM' === $element->node_name && 'html' === $element->namespace ) { 564 $fragment_processor->state->form_element = clone $element; 565 $fragment_processor->state->form_element->bookmark_name = null; 566 $fragment_processor->state->form_element->on_destroy = null; 567 break; 568 } 569 } 570 571 $fragment_processor->state->encoding_confidence = 'irrelevant'; 572 573 /* 574 * Update the parsing namespace near the end of the process. 575 * This is important so that any push/pop from the stack of open 576 * elements does not change the parsing namespace. 577 */ 578 $fragment_processor->change_parsing_namespace( 579 $this->current_element->token->integration_node_type ? 'html' : $namespace 580 ); 581 582 return $fragment_processor; 583 } 584 585 /** 586 * Stops the parser and terminates its execution when encountering unsupported markup. 587 * 588 * @throws WP_HTML_Unsupported_Exception Halts execution of the parser. 589 * 590 * @since 6.7.0 591 * @ignore 592 * 593 * @param string $message Explains support is missing in order to parse the current node. 594 * @return never 595 */ 596 private function bail( string $message ) { 597 $here = $this->bookmarks[ $this->state->current_token->bookmark_name ]; 598 $token = substr( $this->html, $here->start, $here->length ); 599 600 $open_elements = array(); 601 foreach ( $this->state->stack_of_open_elements->stack as $item ) { 602 $open_elements[] = $item->node_name; 603 } 604 605 $active_formats = array(); 606 foreach ( $this->state->active_formatting_elements->walk_down() as $item ) { 607 $active_formats[] = $item->node_name; 608 } 609 610 $this->last_error = self::ERROR_UNSUPPORTED; 611 612 $this->unsupported_exception = new WP_HTML_Unsupported_Exception( 613 $message, 614 $this->state->current_token->node_name, 615 $here->start, 616 $token, 617 $open_elements, 618 $active_formats 619 ); 620 621 throw $this->unsupported_exception; 622 } 623 624 /** 625 * Returns the last error, if any. 626 * 627 * Various situations lead to parsing failure but this class will 628 * return `false` in all those cases. To determine why something 629 * failed it's possible to request the last error. This can be 630 * helpful to know to distinguish whether a given tag couldn't 631 * be found or if content in the document caused the processor 632 * to give up and abort processing. 633 * 634 * Example 635 * 636 * $processor = WP_HTML_Processor::create_fragment( '<template><strong><button><em><p><em>' ); 637 * false === $processor->next_tag(); 638 * WP_HTML_Processor::ERROR_UNSUPPORTED === $processor->get_last_error(); 639 * 640 * @since 6.4.0 641 * 642 * @see self::ERROR_UNSUPPORTED 643 * @see self::ERROR_EXCEEDED_MAX_BOOKMARKS 644 * 645 * @return string|null The last error, if one exists, otherwise null. 646 */ 647 public function get_last_error(): ?string { 648 return $this->last_error; 649 } 650 651 /** 652 * Returns context for why the parser aborted due to unsupported HTML, if it did. 653 * 654 * This is meant for debugging purposes, not for production use. 655 * 656 * @since 6.7.0 657 * 658 * @see self::$unsupported_exception 659 * 660 * @return WP_HTML_Unsupported_Exception|null 661 */ 662 public function get_unsupported_exception() { 663 return $this->unsupported_exception; 664 } 665 666 /** 667 * Finds the next tag matching the $query. 668 * 669 * @todo Support matching the class name and tag name. 670 * 671 * @since 6.4.0 672 * @since 6.6.0 Visits all tokens, including virtual ones. 673 * 674 * @throws Exception When unable to allocate a bookmark for the next token in the input HTML document. 675 * 676 * @param array|string|null $query { 677 * Optional. Which tag name to find, having which class, etc. Default is to find any tag. 678 * 679 * @type string|null $tag_name Which tag to find, or `null` for "any tag." 680 * @type string $tag_closers 'visit' to pause at tag closers, 'skip' or unset to only visit openers. 681 * @type int|null $match_offset Find the Nth tag matching all search criteria. 682 * 1 for "first" tag, 3 for "third," etc. 683 * Defaults to first tag. 684 * @type string|null $class_name Tag must contain this whole class name to match. 685 * @type string[] $breadcrumbs DOM sub-path at which element is found, e.g. `array( 'FIGURE', 'IMG' )`. 686 * May also contain the wildcard `*` which matches a single element, e.g. `array( 'SECTION', '*' )`. 687 * } 688 * @return bool Whether a tag was matched. 689 */ 690 public function next_tag( $query = null ): bool { 691 $visit_closers = isset( $query['tag_closers'] ) && 'visit' === $query['tag_closers']; 692 693 if ( null === $query ) { 694 while ( $this->next_token() ) { 695 if ( '#tag' !== $this->get_token_type() ) { 696 continue; 697 } 698 699 if ( ! $this->is_tag_closer() || $visit_closers ) { 700 return true; 701 } 702 } 703 704 return false; 705 } 706 707 if ( is_string( $query ) ) { 708 $query = array( 'breadcrumbs' => array( $query ) ); 709 } 710 711 if ( ! is_array( $query ) ) { 712 _doing_it_wrong( 713 __METHOD__, 714 __( 'Please pass a query array to this function.' ), 715 '6.4.0' 716 ); 717 return false; 718 } 719 720 if ( isset( $query['tag_name'] ) ) { 721 $query['tag_name'] = strtoupper( $query['tag_name'] ); 722 } 723 724 $needs_class = ( isset( $query['class_name'] ) && is_string( $query['class_name'] ) ) 725 ? $query['class_name'] 726 : null; 727 728 if ( ! ( array_key_exists( 'breadcrumbs', $query ) && is_array( $query['breadcrumbs'] ) ) ) { 729 while ( $this->next_token() ) { 730 if ( '#tag' !== $this->get_token_type() ) { 731 continue; 732 } 733 734 if ( isset( $query['tag_name'] ) && $query['tag_name'] !== $this->get_token_name() ) { 735 continue; 736 } 737 738 if ( isset( $needs_class ) && ! $this->has_class( $needs_class ) ) { 739 continue; 740 } 741 742 if ( ! $this->is_tag_closer() || $visit_closers ) { 743 return true; 744 } 745 } 746 747 return false; 748 } 749 750 $breadcrumbs = $query['breadcrumbs']; 751 $match_offset = isset( $query['match_offset'] ) ? (int) $query['match_offset'] : 1; 752 753 while ( $match_offset > 0 && $this->next_token() ) { 754 if ( '#tag' !== $this->get_token_type() || $this->is_tag_closer() ) { 755 continue; 756 } 757 758 if ( isset( $needs_class ) && ! $this->has_class( $needs_class ) ) { 759 continue; 760 } 761 762 if ( $this->matches_breadcrumbs( $breadcrumbs ) && 0 === --$match_offset ) { 763 return true; 764 } 765 } 766 767 return false; 768 } 769 770 /** 771 * Finds the next token in the HTML document. 772 * 773 * This doesn't currently have a way to represent non-tags and doesn't process 774 * semantic rules for text nodes. For access to the raw tokens consider using 775 * WP_HTML_Tag_Processor instead. 776 * 777 * @since 6.5.0 Added for internal support; do not use. 778 * @since 6.7.2 Refactored so subclasses may extend. 779 * 780 * @return bool Whether a token was parsed. 781 */ 782 public function next_token(): bool { 783 return $this->next_visitable_token(); 784 } 785 786 /** 787 * Ensures internal accounting is maintained for HTML semantic rules while 788 * the underlying Tag Processor class is seeking to a bookmark. 789 * 790 * This doesn't currently have a way to represent non-tags and doesn't process 791 * semantic rules for text nodes. For access to the raw tokens consider using 792 * WP_HTML_Tag_Processor instead. 793 * 794 * Note that this method may call itself recursively. This is why it is not 795 * implemented as {@see WP_HTML_Processor::next_token()}, which instead calls 796 * this method similarly to how {@see WP_HTML_Tag_Processor::next_token()} 797 * calls the {@see WP_HTML_Tag_Processor::base_class_next_token()} method. 798 * 799 * @since 6.7.2 Added for internal support. 800 * @ignore 801 * 802 * @return bool 803 */ 804 private function next_visitable_token(): bool { 805 $this->current_element = null; 806 807 if ( isset( $this->last_error ) ) { 808 return false; 809 } 810 811 /* 812 * Prime the events if there are none. 813 * 814 * @todo In some cases, probably related to the adoption agency 815 * algorithm, this call to step() doesn't create any new 816 * events. Calling it again creates them. Figure out why 817 * this is and if it's inherent or if it's a bug. Looping 818 * until there are events or until there are no more 819 * tokens works in the meantime and isn't obviously wrong. 820 */ 821 if ( empty( $this->element_queue ) ) { 822 if ( $this->step() ) { 823 return $this->next_visitable_token(); 824 } 825 826 if ( isset( $this->last_error ) ) { 827 return false; 828 } 829 } 830 831 // Process the next event on the queue. 832 $this->current_element = array_shift( $this->element_queue ); 833 if ( ! isset( $this->current_element ) ) { 834 // There are no tokens left, so close all remaining open elements. 835 while ( $this->state->stack_of_open_elements->pop() ) { 836 continue; 837 } 838 839 return empty( $this->element_queue ) ? false : $this->next_visitable_token(); 840 } 841 842 $is_pop = WP_HTML_Stack_Event::POP === $this->current_element->operation; 843 844 /* 845 * The root node only exists in the fragment parser, and closing it 846 * indicates that the parse is complete. Stop before popping it from 847 * the breadcrumbs. 848 */ 849 if ( 'root-node' === $this->current_element->token->bookmark_name ) { 850 return $this->next_visitable_token(); 851 } 852 853 // Adjust the breadcrumbs for this event. 854 if ( $is_pop ) { 855 array_pop( $this->breadcrumbs ); 856 } else { 857 $this->breadcrumbs[] = $this->current_element->token->node_name; 858 } 859 860 // Avoid sending close events for elements which don't expect a closing. 861 if ( $is_pop && ! $this->expects_closer( $this->current_element->token ) ) { 862 return $this->next_visitable_token(); 863 } 864 865 return true; 866 } 867 868 /** 869 * Indicates if the current tag token is a tag closer. 870 * 871 * Example: 872 * 873 * $p = WP_HTML_Processor::create_fragment( '<div></div>' ); 874 * $p->next_tag( array( 'tag_name' => 'div', 'tag_closers' => 'visit' ) ); 875 * $p->is_tag_closer() === false; 876 * 877 * $p->next_tag( array( 'tag_name' => 'div', 'tag_closers' => 'visit' ) ); 878 * $p->is_tag_closer() === true; 879 * 880 * @since 6.6.0 Subclassed for HTML Processor. 881 * 882 * @return bool Whether the current tag is a tag closer. 883 */ 884 public function is_tag_closer(): bool { 885 return $this->is_virtual() 886 ? ( WP_HTML_Stack_Event::POP === $this->current_element->operation && '#tag' === $this->get_token_type() ) 887 : parent::is_tag_closer(); 888 } 889 890 /** 891 * Indicates if the currently-matched token is virtual, created by a stack operation 892 * while processing HTML, rather than a token found in the HTML text itself. 893 * 894 * @since 6.6.0 895 * @ignore 896 * 897 * @return bool Whether the current token is virtual. 898 */ 899 private function is_virtual(): bool { 900 return ( 901 isset( $this->current_element->provenance ) && 902 'virtual' === $this->current_element->provenance 903 ); 904 } 905 906 /** 907 * Indicates if the currently-matched tag matches the given breadcrumbs. 908 * 909 * A "*" represents a single tag wildcard, where any tag matches, but not no tags. 910 * 911 * At some point this function _may_ support a `**` syntax for matching any number 912 * of unspecified tags in the breadcrumb stack. This has been intentionally left 913 * out, however, to keep this function simple and to avoid introducing backtracking, 914 * which could open up surprising performance breakdowns. 915 * 916 * Example: 917 * 918 * $processor = WP_HTML_Processor::create_fragment( '<div><span><figure><img></figure></span></div>' ); 919 * $processor->next_tag( 'img' ); 920 * true === $processor->matches_breadcrumbs( array( 'figure', 'img' ) ); 921 * true === $processor->matches_breadcrumbs( array( 'span', 'figure', 'img' ) ); 922 * false === $processor->matches_breadcrumbs( array( 'span', 'img' ) ); 923 * true === $processor->matches_breadcrumbs( array( 'span', '*', 'img' ) ); 924 * 925 * @since 6.4.0 926 * 927 * @param string[] $breadcrumbs DOM sub-path at which element is found, e.g. `array( 'FIGURE', 'IMG' )`. 928 * May also contain the wildcard `*` which matches a single element, e.g. `array( 'SECTION', '*' )`. 929 * @return bool Whether the currently-matched tag is found at the given nested structure. 930 */ 931 public function matches_breadcrumbs( $breadcrumbs ): bool { 932 // Everything matches when there are zero constraints. 933 if ( 0 === count( $breadcrumbs ) ) { 934 return true; 935 } 936 937 // Start at the last crumb. 938 $crumb = end( $breadcrumbs ); 939 940 if ( '*' !== $crumb && $this->get_tag() !== strtoupper( $crumb ) ) { 941 return false; 942 } 943 944 for ( $i = count( $this->breadcrumbs ) - 1; $i >= 0; $i-- ) { 945 $node = $this->breadcrumbs[ $i ]; 946 $crumb = strtoupper( current( $breadcrumbs ) ); 947 948 if ( '*' !== $crumb && $node !== $crumb ) { 949 return false; 950 } 951 952 if ( false === prev( $breadcrumbs ) ) { 953 return true; 954 } 955 } 956 957 return false; 958 } 959 960 /** 961 * Indicates if the currently-matched node expects a closing 962 * token, or if it will self-close on the next step. 963 * 964 * Most HTML elements expect a closer, such as a P element or 965 * a DIV element. Others, like an IMG element, are void and don't 966 * have a closing tag. Special elements, such as SCRIPT and STYLE, 967 * are treated just like void tags. Text nodes and self-closing 968 * foreign content will also act just like a void tag, immediately 969 * closing as soon as the processor advances to the next token. 970 * 971 * @since 6.6.0 972 * 973 * @param WP_HTML_Token|null $node Optional. Node to examine, if provided. 974 * Default is to examine current node. 975 * @return bool|null Whether to expect a closer for the currently-matched node, 976 * or `null` if not matched on any token. 977 */ 978 public function expects_closer( ?WP_HTML_Token $node = null ): ?bool { 979 $token_name = $node->node_name ?? $this->get_token_name(); 980 981 if ( ! isset( $token_name ) ) { 982 return null; 983 } 984 985 $token_namespace = $node->namespace ?? $this->get_namespace(); 986 $token_has_self_closing = $node->has_self_closing_flag ?? $this->has_self_closing_flag(); 987 988 return ! ( 989 // Comments, text nodes, and other atomic tokens. 990 '#' === $token_name[0] || 991 // Doctype declarations. 992 'html' === $token_name || 993 // Void elements. 994 ( 'html' === $token_namespace && self::is_void( $token_name ) ) || 995 // Special atomic elements. 996 ( 'html' === $token_namespace && in_array( $token_name, array( 'IFRAME', 'NOEMBED', 'NOFRAMES', 'SCRIPT', 'STYLE', 'TEXTAREA', 'TITLE', 'XMP' ), true ) ) || 997 // Self-closing elements in foreign content. 998 ( 'html' !== $token_namespace && $token_has_self_closing ) 999 ); 1000 } 1001 1002 /** 1003 * Steps through the HTML document and stop at the next tag, if any. 1004 * 1005 * This is an internal method. The relevant public methods are 1006 * {@see WP_HTML_Processor::next_tag()} and {@see WP_HTML_Processor::next_token()}. 1007 * 1008 * @since 6.4.0 1009 * 1010 * @access private 1011 * 1012 * @throws Exception When unable to allocate a bookmark for the next token in the input HTML document. 1013 * 1014 * @see self::PROCESS_NEXT_NODE 1015 * @see self::REPROCESS_CURRENT_NODE 1016 * 1017 * @param string $node_to_process Whether to parse the next node or reprocess the current node. 1018 * @return bool Whether a tag was matched. 1019 */ 1020 public function step( $node_to_process = self::PROCESS_NEXT_NODE ): bool { 1021 // Refuse to proceed if there was a previous error. 1022 if ( null !== $this->last_error ) { 1023 return false; 1024 } 1025 1026 if ( self::REPROCESS_CURRENT_NODE !== $node_to_process ) { 1027 /* 1028 * Void elements still hop onto the stack of open elements even though 1029 * there's no corresponding closing tag. This is important for managing 1030 * stack-based operations such as "navigate to parent node" or checking 1031 * on an element's breadcrumbs. 1032 * 1033 * When moving on to the next node, therefore, if the bottom-most element 1034 * on the stack is a void element, it must be closed. 1035 */ 1036 $top_node = $this->state->stack_of_open_elements->current_node(); 1037 if ( isset( $top_node ) && ! $this->expects_closer( $top_node ) ) { 1038 $this->state->stack_of_open_elements->pop(); 1039 } 1040 } 1041 1042 if ( self::PROCESS_NEXT_NODE === $node_to_process ) { 1043 parent::next_token(); 1044 if ( WP_HTML_Tag_Processor::STATE_TEXT_NODE === $this->parser_state ) { 1045 parent::subdivide_text_appropriately(); 1046 } 1047 } 1048 1049 // Finish stepping when there are no more tokens in the document. 1050 if ( 1051 WP_HTML_Tag_Processor::STATE_INCOMPLETE_INPUT === $this->parser_state || 1052 WP_HTML_Tag_Processor::STATE_COMPLETE === $this->parser_state 1053 ) { 1054 return false; 1055 } 1056 1057 $adjusted_current_node = $this->get_adjusted_current_node(); 1058 $is_closer = $this->is_tag_closer(); 1059 $is_start_tag = WP_HTML_Tag_Processor::STATE_MATCHED_TAG === $this->parser_state && ! $is_closer; 1060 $token_name = $this->get_token_name(); 1061 1062 if ( self::REPROCESS_CURRENT_NODE !== $node_to_process ) { 1063 try { 1064 $bookmark_name = $this->bookmark_token(); 1065 } catch ( Exception $e ) { 1066 if ( self::ERROR_EXCEEDED_MAX_BOOKMARKS === $this->last_error ) { 1067 return false; 1068 } 1069 throw $e; 1070 } 1071 1072 $this->state->current_token = new WP_HTML_Token( 1073 $bookmark_name, 1074 $token_name, 1075 $this->has_self_closing_flag(), 1076 $this->release_internal_bookmark_on_destruct 1077 ); 1078 } 1079 1080 $parse_in_current_insertion_mode = ( 1081 0 === $this->state->stack_of_open_elements->count() || 1082 'html' === $adjusted_current_node->namespace || 1083 ( 1084 'math' === $adjusted_current_node->integration_node_type && 1085 ( 1086 ( $is_start_tag && ! in_array( $token_name, array( 'MGLYPH', 'MALIGNMARK' ), true ) ) || 1087 '#text' === $token_name 1088 ) 1089 ) || 1090 ( 1091 'math' === $adjusted_current_node->namespace && 1092 'ANNOTATION-XML' === $adjusted_current_node->node_name && 1093 $is_start_tag && 'SVG' === $token_name 1094 ) || 1095 ( 1096 'html' === $adjusted_current_node->integration_node_type && 1097 ( $is_start_tag || '#text' === $token_name ) 1098 ) 1099 ); 1100 1101 try { 1102 if ( ! $parse_in_current_insertion_mode ) { 1103 return $this->step_in_foreign_content(); 1104 } 1105 1106 switch ( $this->state->insertion_mode ) { 1107 case WP_HTML_Processor_State::INSERTION_MODE_INITIAL: 1108 return $this->step_initial(); 1109 1110 case WP_HTML_Processor_State::INSERTION_MODE_BEFORE_HTML: 1111 return $this->step_before_html(); 1112 1113 case WP_HTML_Processor_State::INSERTION_MODE_BEFORE_HEAD: 1114 return $this->step_before_head(); 1115 1116 case WP_HTML_Processor_State::INSERTION_MODE_IN_HEAD: 1117 return $this->step_in_head(); 1118 1119 case WP_HTML_Processor_State::INSERTION_MODE_IN_HEAD_NOSCRIPT: 1120 return $this->step_in_head_noscript(); 1121 1122 case WP_HTML_Processor_State::INSERTION_MODE_AFTER_HEAD: 1123 return $this->step_after_head(); 1124 1125 case WP_HTML_Processor_State::INSERTION_MODE_IN_BODY: 1126 return $this->step_in_body(); 1127 1128 case WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE: 1129 return $this->step_in_table(); 1130 1131 case WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE_TEXT: 1132 return $this->step_in_table_text(); 1133 1134 case WP_HTML_Processor_State::INSERTION_MODE_IN_CAPTION: 1135 return $this->step_in_caption(); 1136 1137 case WP_HTML_Processor_State::INSERTION_MODE_IN_COLUMN_GROUP: 1138 return $this->step_in_column_group(); 1139 1140 case WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE_BODY: 1141 return $this->step_in_table_body(); 1142 1143 case WP_HTML_Processor_State::INSERTION_MODE_IN_ROW: 1144 return $this->step_in_row(); 1145 1146 case WP_HTML_Processor_State::INSERTION_MODE_IN_CELL: 1147 return $this->step_in_cell(); 1148 1149 case WP_HTML_Processor_State::INSERTION_MODE_IN_TEMPLATE: 1150 return $this->step_in_template(); 1151 1152 case WP_HTML_Processor_State::INSERTION_MODE_AFTER_BODY: 1153 return $this->step_after_body(); 1154 1155 case WP_HTML_Processor_State::INSERTION_MODE_IN_FRAMESET: 1156 return $this->step_in_frameset(); 1157 1158 case WP_HTML_Processor_State::INSERTION_MODE_AFTER_FRAMESET: 1159 return $this->step_after_frameset(); 1160 1161 case WP_HTML_Processor_State::INSERTION_MODE_AFTER_AFTER_BODY: 1162 return $this->step_after_after_body(); 1163 1164 case WP_HTML_Processor_State::INSERTION_MODE_AFTER_AFTER_FRAMESET: 1165 return $this->step_after_after_frameset(); 1166 1167 // This should be unreachable but PHP doesn't have total type checking on switch. 1168 default: 1169 $this->bail( "Unaware of the requested parsing mode: '{$this->state->insertion_mode}'." ); 1170 } 1171 } catch ( WP_HTML_Unsupported_Exception $e ) { 1172 /* 1173 * Exceptions are used in this class to escape deep call stacks that 1174 * otherwise might involve messier calling and return conventions. 1175 */ 1176 return false; 1177 } catch ( Exception $e ) { 1178 if ( self::ERROR_EXCEEDED_MAX_BOOKMARKS === $this->last_error ) { 1179 return false; 1180 } 1181 // Rethrow any other exceptions for higher-level handling. 1182 throw $e; 1183 } 1184 } 1185 1186 /** 1187 * Computes the HTML breadcrumbs for the currently-matched node, if matched. 1188 * 1189 * Breadcrumbs start at the outermost parent and descend toward the matched element. 1190 * They always include the entire path from the root HTML node to the matched element. 1191 * 1192 * Example: 1193 * 1194 * $processor = WP_HTML_Processor::create_fragment( '<p><strong><em><img></em></strong></p>' ); 1195 * $processor->next_tag( 'IMG' ); 1196 * $processor->get_breadcrumbs() === array( 'HTML', 'BODY', 'P', 'STRONG', 'EM', 'IMG' ); 1197 * 1198 * @since 6.4.0 1199 * 1200 * @return string[] Array of tag names representing path to matched node. 1201 */ 1202 public function get_breadcrumbs(): array { 1203 return $this->breadcrumbs; 1204 } 1205 1206 /** 1207 * Returns the nesting depth of the current location in the document. 1208 * 1209 * Example: 1210 * 1211 * $processor = WP_HTML_Processor::create_fragment( '<div><p></p></div>' ); 1212 * // The processor starts in the BODY context, meaning it has depth from the start: HTML > BODY. 1213 * 2 === $processor->get_current_depth(); 1214 * 1215 * // Opening the DIV element increases the depth. 1216 * $processor->next_token(); 1217 * 3 === $processor->get_current_depth(); 1218 * 1219 * // Opening the P element increases the depth. 1220 * $processor->next_token(); 1221 * 4 === $processor->get_current_depth(); 1222 * 1223 * // The P element is closed during `next_token()` so the depth is decreased to reflect that. 1224 * $processor->next_token(); 1225 * 3 === $processor->get_current_depth(); 1226 * 1227 * @since 6.6.0 1228 * 1229 * @return int Nesting-depth of current location in the document. 1230 */ 1231 public function get_current_depth(): int { 1232 return count( $this->breadcrumbs ); 1233 } 1234 1235 /** 1236 * Normalizes an HTML fragment by serializing it. 1237 * 1238 * This method assumes that the given HTML snippet is found in BODY context. 1239 * For normalizing full documents or fragments found in other contexts, create 1240 * a new processor using {@see WP_HTML_Processor::create_fragment} or 1241 * {@see WP_HTML_Processor::create_full_parser} and call {@see WP_HTML_Processor::serialize} 1242 * on the created instances. 1243 * 1244 * Many aspects of an input HTML fragment may be changed during normalization. 1245 * 1246 * - Attribute values will be double-quoted. 1247 * - Duplicate attributes will be removed. 1248 * - Omitted tags will be added. 1249 * - Tag and attribute name casing will be lower-cased, 1250 * except for specific SVG and MathML tags or attributes. 1251 * - Text will be re-encoded, null bytes handled, 1252 * and invalid UTF-8 replaced with U+FFFD. 1253 * - Any incomplete syntax trailing at the end will be omitted, 1254 * for example, an unclosed comment opener will be removed. 1255 * 1256 * Example: 1257 * 1258 * echo WP_HTML_Processor::normalize( '<a href=#anchor v=5 href="/" enabled>One</a another v=5><!--' ); 1259 * // <a href="#anchor" v="5" enabled>One</a> 1260 * 1261 * echo WP_HTML_Processor::normalize( '<div></p>fun<table><td>cell</div>' ); 1262 * // <div><p></p>fun<table><tbody><tr><td>cell</td></tr></tbody></table></div> 1263 * 1264 * echo WP_HTML_Processor::normalize( '<![CDATA[invalid comment]]> syntax < <> "oddities"' ); 1265 * // <!--[CDATA[invalid comment]]--> syntax < <> "oddities" 1266 * 1267 * @since 6.7.0 1268 * 1269 * @param string $html Input HTML to normalize. 1270 * 1271 * @return string|null Normalized output, or `null` if unable to normalize. 1272 */ 1273 public static function normalize( string $html ): ?string { 1274 return static::create_fragment( $html )->serialize(); 1275 } 1276 1277 /** 1278 * Returns normalized HTML for a fragment by serializing it. 1279 * 1280 * This differs from {@see WP_HTML_Processor::normalize} in that it starts with 1281 * a specific HTML Processor, which _must_ not have already started scanning; 1282 * it must be in the initial ready state and will be in the completed state once 1283 * serialization is complete. 1284 * 1285 * Many aspects of an input HTML fragment may be changed during normalization. 1286 * 1287 * - Attribute values will be double-quoted. 1288 * - Duplicate attributes will be removed. 1289 * - Omitted tags will be added. 1290 * - Tag and attribute name casing will be lower-cased, 1291 * except for specific SVG and MathML tags or attributes. 1292 * - Text will be re-encoded, null bytes handled, 1293 * and invalid UTF-8 replaced with U+FFFD. 1294 * - Any incomplete syntax trailing at the end will be omitted, 1295 * for example, an unclosed comment opener will be removed. 1296 * 1297 * Example: 1298 * 1299 * $processor = WP_HTML_Processor::create_fragment( '<a href=#anchor v=5 href="/" enabled>One</a another v=5><!--' ); 1300 * echo $processor->serialize(); 1301 * // <a href="#anchor" v="5" enabled>One</a> 1302 * 1303 * $processor = WP_HTML_Processor::create_fragment( '<div></p>fun<table><td>cell</div>' ); 1304 * echo $processor->serialize(); 1305 * // <div><p></p>fun<table><tbody><tr><td>cell</td></tr></tbody></table></div> 1306 * 1307 * $processor = WP_HTML_Processor::create_fragment( '<![CDATA[invalid comment]]> syntax < <> "oddities"' ); 1308 * echo $processor->serialize(); 1309 * // <!--[CDATA[invalid comment]]--> syntax < <> "oddities" 1310 * 1311 * @since 6.7.0 1312 * 1313 * @return string|null Normalized HTML markup represented by processor, 1314 * or `null` if unable to generate serialization. 1315 */ 1316 public function serialize(): ?string { 1317 if ( WP_HTML_Tag_Processor::STATE_READY !== $this->parser_state ) { 1318 wp_trigger_error( 1319 __METHOD__, 1320 'An HTML Processor which has already started processing cannot serialize its contents. Serialize immediately after creating the instance.', 1321 E_USER_WARNING 1322 ); 1323 return null; 1324 } 1325 1326 $html = ''; 1327 while ( $this->next_token() ) { 1328 $html .= $this->serialize_token(); 1329 } 1330 1331 if ( null !== $this->get_last_error() ) { 1332 wp_trigger_error( 1333 __METHOD__, 1334 "Cannot serialize HTML Processor with parsing error: {$this->get_last_error()}.", 1335 E_USER_WARNING 1336 ); 1337 return null; 1338 } 1339 1340 return $html; 1341 } 1342 1343 /** 1344 * Serializes the currently-matched token. 1345 * 1346 * This method produces a fully-normative HTML string for the currently-matched token, 1347 * if able. If not matched at any token or if the token doesn't correspond to any HTML 1348 * it will return an empty string (for example, presumptuous end tags are ignored). 1349 * 1350 * @see static::serialize() 1351 * 1352 * @since 6.7.0 1353 * @since 6.9.0 Converted from protected to public method. 1354 * 1355 * @return string Serialization of token, or empty string if no serialization exists. 1356 */ 1357 public function serialize_token(): string { 1358 $html = ''; 1359 $token_type = $this->get_token_type(); 1360 1361 switch ( $token_type ) { 1362 case '#doctype': 1363 $doctype = $this->get_doctype_info(); 1364 if ( null === $doctype ) { 1365 break; 1366 } 1367 1368 $html .= '<!DOCTYPE'; 1369 1370 if ( $doctype->name ) { 1371 $html .= " {$doctype->name}"; 1372 } 1373 1374 if ( null !== $doctype->public_identifier ) { 1375 $quote = str_contains( $doctype->public_identifier, '"' ) ? "'" : '"'; 1376 $html .= " PUBLIC {$quote}{$doctype->public_identifier}{$quote}"; 1377 } 1378 if ( null !== $doctype->system_identifier ) { 1379 if ( null === $doctype->public_identifier ) { 1380 $html .= ' SYSTEM'; 1381 } 1382 $quote = str_contains( $doctype->system_identifier, '"' ) ? "'" : '"'; 1383 $html .= " {$quote}{$doctype->system_identifier}{$quote}"; 1384 } 1385 1386 $html .= '>'; 1387 break; 1388 1389 case '#text': 1390 $html .= self::escape_text_for_serialization( $this->get_modifiable_text() ); 1391 break; 1392 1393 // Unlike the `<>` which is interpreted as plaintext, this is ignored entirely. 1394 case '#presumptuous-tag': 1395 break; 1396 1397 case '#funky-comment': 1398 case '#comment': 1399 $html .= "<!--{$this->get_full_comment_text()}-->"; 1400 break; 1401 1402 /** 1403 * Processing instructions are serialized as `"<?" target " " data "?>"`. 1404 * 1405 * @link https://html.spec.whatwg.org/multipage/parsing.html#serialising-html-fragments 1406 */ 1407 case '#processing-instruction': 1408 $html .= "<?{$this->get_tag()} {$this->get_modifiable_text()}?>"; 1409 break; 1410 1411 case '#cdata-section': 1412 $html .= "<![CDATA[{$this->get_modifiable_text()}]]>"; 1413 break; 1414 } 1415 1416 if ( '#tag' !== $token_type ) { 1417 return $html; 1418 } 1419 1420 $tag_name = $this->get_tag(); 1421 $in_html = 'html' === $this->get_namespace(); 1422 $qualified_name = $in_html ? strtolower( $tag_name ) : $this->get_qualified_tag_name(); 1423 1424 if ( $this->is_tag_closer() ) { 1425 $html .= "</{$qualified_name}>"; 1426 return $html; 1427 } 1428 1429 $attribute_names = $this->get_attribute_names_with_prefix( '' ); 1430 if ( ! isset( $attribute_names ) ) { 1431 $html .= "<{$qualified_name}>"; 1432 return $html; 1433 } 1434 1435 $html .= "<{$qualified_name}"; 1436 1437 $previous_attribute_was_true = false; 1438 $seen_attribute_names = array(); 1439 foreach ( $attribute_names as $attribute_name ) { 1440 $qualified_attribute_name = $this->get_qualified_attribute_name( $attribute_name ); 1441 $qualified_attribute_name = wp_scrub_utf8( $qualified_attribute_name ); 1442 /** 1443 * Spaces only appear via the foreign attribute adjustment table. 1444 * @see WP_HTML_Tag_Processor::get_qualified_attribute_name() 1445 */ 1446 $serialized_attribute_name = str_replace( ' ', ':', $qualified_attribute_name ); 1447 if ( isset( $seen_attribute_names[ $qualified_attribute_name ] ) ) { 1448 continue; 1449 } else { 1450 $seen_attribute_names[ $qualified_attribute_name ] = true; 1451 } 1452 1453 if ( 1454 $previous_attribute_was_true && 1455 isset( $serialized_attribute_name[0] ) && 1456 '=' === $serialized_attribute_name[0] 1457 ) { 1458 $html .= '=""'; 1459 } 1460 1461 $html .= " {$serialized_attribute_name}"; 1462 $value = $this->get_attribute( $attribute_name ); 1463 1464 if ( is_string( $value ) ) { 1465 $html .= '="' . self::escape_text_for_serialization( $value ) . '"'; 1466 } 1467 1468 $previous_attribute_was_true = true === $value; 1469 } 1470 1471 if ( ! $in_html && $this->has_self_closing_flag() ) { 1472 $html .= ' /'; 1473 } 1474 1475 $html .= '>'; 1476 1477 /* 1478 * The HTML parser strips a leading newline immediately after the start 1479 * tag of TEXTAREA, PRE, and LISTING elements in HTML content. When serializing, 1480 * prepend a leading newline to ensure the semantic HTML content is preserved. 1481 * 1482 * For example, `<pre>\n\nX</pre>` must not become `<pre>\nX</pre>` because its content 1483 * has changed. However, `<pre>X</pre>` and `<pre>\nX</pre>` are _equivalent_. 1484 * 1485 * > A start tag whose tag name is "textarea" 1486 * > … 1487 * > If the next token is a U+000A LINE FEED (LF) character token, then ignore 1488 * > that token and move on to the next one. (Newlines at the start of textarea 1489 * > elements are ignored as an authoring convenience.) 1490 * 1491 * > A start tag whose tag name is one of: "pre", "listing" 1492 * > … 1493 * > If the next token is a U+000A LINE FEED (LF) character token, then ignore 1494 * > that token and move on to the next one. (Newlines at the start of pre blocks 1495 * > are ignored as an authoring convenience.) 1496 * 1497 * @see https://html.spec.whatwg.org/multipage/parsing.html 1498 */ 1499 if ( $in_html && ( 'TEXTAREA' === $tag_name || 'PRE' === $tag_name || 'LISTING' === $tag_name ) ) { 1500 $html .= "\n"; 1501 } 1502 1503 // Flush out self-contained elements. 1504 if ( $in_html && in_array( $tag_name, array( 'IFRAME', 'NOEMBED', 'NOFRAMES', 'SCRIPT', 'STYLE', 'TEXTAREA', 'TITLE', 'XMP' ), true ) ) { 1505 $text = $this->get_modifiable_text(); 1506 1507 switch ( $tag_name ) { 1508 case 'IFRAME': 1509 case 'NOEMBED': 1510 case 'NOFRAMES': 1511 case 'SCRIPT': 1512 case 'STYLE': 1513 case 'XMP': 1514 break; 1515 1516 default: 1517 $text = self::escape_text_for_serialization( $text ); 1518 } 1519 1520 $html .= "{$text}</{$qualified_name}>"; 1521 } 1522 1523 return $html; 1524 } 1525 1526 /** 1527 * Escapes decoded text for HTML serialization. 1528 * 1529 * Use for: 1530 * - Attribute values. 1531 * - Text in ordinary (data-state) elements and in the RCDATA elements 1532 * (TITLE and TEXTAREA). 1533 * - Text in foreign content (elements not in the HTML namespace). 1534 * 1535 * Do not use for text in the RAWTEXT elements (STYLE, XMP, IFRAME, 1536 * NOEMBED, NOFRAMES), HTML SCRIPT elements, or PLAINTEXT elements, 1537 * whose contents serialize without escaping. 1538 * 1539 * @since 7.1.0 1540 * @ignore 1541 * 1542 * @param string $text Decoded text to escape. 1543 * @return string Escaped text. 1544 */ 1545 private static function escape_text_for_serialization( string $text ): string { 1546 $text = htmlspecialchars( $text, ENT_QUOTES | ENT_SUBSTITUTE | ENT_HTML5, 'UTF-8' ); 1547 1548 $text = str_replace( "\r", '
', $text ); 1549 1550 return str_replace( "\x00", "\u{FFFD}", $text ); 1551 } 1552 1553 /** 1554 * Parses next element in the 'initial' insertion mode. 1555 * 1556 * This internal function performs the 'initial' insertion mode 1557 * logic for the generalized WP_HTML_Processor::step() function. 1558 * 1559 * @since 6.7.0 1560 * @ignore 1561 * 1562 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. 1563 * 1564 * @see https://html.spec.whatwg.org/#the-initial-insertion-mode 1565 * @see WP_HTML_Processor::step 1566 * 1567 * @return bool Whether an element was found. 1568 */ 1569 private function step_initial(): bool { 1570 $token_name = $this->get_token_name(); 1571 $token_type = $this->get_token_type(); 1572 $op_sigil = '#tag' === $token_type ? ( parent::is_tag_closer() ? '-' : '+' ) : ''; 1573 $op = "{$op_sigil}{$token_name}"; 1574 1575 switch ( $op ) { 1576 /* 1577 * > A character token that is one of U+0009 CHARACTER TABULATION, 1578 * > U+000A LINE FEED (LF), U+000C FORM FEED (FF), 1579 * > U+000D CARRIAGE RETURN (CR), or U+0020 SPACE 1580 * 1581 * Parse error: ignore the token. 1582 */ 1583 case '#text': 1584 if ( parent::TEXT_IS_WHITESPACE === $this->text_node_classification ) { 1585 return $this->step(); 1586 } 1587 goto initial_anything_else; 1588 break; 1589 1590 /* 1591 * > A comment token 1592 * > A processing instruction token 1593 */ 1594 case '#comment': 1595 case '#funky-comment': 1596 case '#presumptuous-tag': 1597 case '#processing-instruction': 1598 $this->insert_html_element( $this->state->current_token ); 1599 return true; 1600 1601 /* 1602 * > A DOCTYPE token 1603 */ 1604 case 'html': 1605 $doctype = $this->get_doctype_info(); 1606 if ( null !== $doctype && 'quirks' === $doctype->indicated_compatibility_mode ) { 1607 $this->compat_mode = WP_HTML_Tag_Processor::QUIRKS_MODE; 1608 } 1609 1610 /* 1611 * > Then, switch the insertion mode to "before html". 1612 */ 1613 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_BEFORE_HTML; 1614 $this->insert_html_element( $this->state->current_token ); 1615 return true; 1616 } 1617 1618 /* 1619 * > Anything else 1620 */ 1621 initial_anything_else: 1622 $this->compat_mode = WP_HTML_Tag_Processor::QUIRKS_MODE; 1623 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_BEFORE_HTML; 1624 return $this->step( self::REPROCESS_CURRENT_NODE ); 1625 } 1626 1627 /** 1628 * Parses next element in the 'before html' insertion mode. 1629 * 1630 * This internal function performs the 'before html' insertion mode 1631 * logic for the generalized WP_HTML_Processor::step() function. 1632 * 1633 * @since 6.7.0 1634 * @ignore 1635 * 1636 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. 1637 * 1638 * @see https://html.spec.whatwg.org/#the-before-html-insertion-mode 1639 * @see WP_HTML_Processor::step 1640 * 1641 * @return bool Whether an element was found. 1642 */ 1643 private function step_before_html(): bool { 1644 $token_name = $this->get_token_name(); 1645 $token_type = $this->get_token_type(); 1646 $is_closer = parent::is_tag_closer(); 1647 $op_sigil = '#tag' === $token_type ? ( $is_closer ? '-' : '+' ) : ''; 1648 $op = "{$op_sigil}{$token_name}"; 1649 1650 switch ( $op ) { 1651 /* 1652 * > A DOCTYPE token 1653 */ 1654 case 'html': 1655 // Parse error: ignore the token. 1656 return $this->step(); 1657 1658 /* 1659 * > A comment token 1660 * > A processing instruction token 1661 */ 1662 case '#comment': 1663 case '#funky-comment': 1664 case '#presumptuous-tag': 1665 case '#processing-instruction': 1666 $this->insert_html_element( $this->state->current_token ); 1667 return true; 1668 1669 /* 1670 * > A character token that is one of U+0009 CHARACTER TABULATION, 1671 * > U+000A LINE FEED (LF), U+000C FORM FEED (FF), 1672 * > U+000D CARRIAGE RETURN (CR), or U+0020 SPACE 1673 * 1674 * Parse error: ignore the token. 1675 */ 1676 case '#text': 1677 if ( parent::TEXT_IS_WHITESPACE === $this->text_node_classification ) { 1678 return $this->step(); 1679 } 1680 goto before_html_anything_else; 1681 break; 1682 1683 /* 1684 * > A start tag whose tag name is "html" 1685 */ 1686 case '+HTML': 1687 $this->insert_html_element( $this->state->current_token ); 1688 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_BEFORE_HEAD; 1689 return true; 1690 1691 /* 1692 * > An end tag whose tag name is one of: "head", "body", "html", "br" 1693 * 1694 * Closing BR tags are always reported by the Tag Processor as opening tags. 1695 */ 1696 case '-HEAD': 1697 case '-BODY': 1698 case '-HTML': 1699 /* 1700 * > Act as described in the "anything else" entry below. 1701 */ 1702 goto before_html_anything_else; 1703 break; 1704 } 1705 1706 /* 1707 * > Any other end tag 1708 */ 1709 if ( $is_closer ) { 1710 // Parse error: ignore the token. 1711 return $this->step(); 1712 } 1713 1714 /* 1715 * > Anything else. 1716 * 1717 * > Create an html element whose node document is the Document object. 1718 * > Append it to the Document object. Put this element in the stack of open elements. 1719 * > Switch the insertion mode to "before head", then reprocess the token. 1720 */ 1721 before_html_anything_else: 1722 $this->insert_virtual_node( 'HTML' ); 1723 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_BEFORE_HEAD; 1724 return $this->step( self::REPROCESS_CURRENT_NODE ); 1725 } 1726 1727 /** 1728 * Parses next element in the 'before head' insertion mode. 1729 * 1730 * This internal function performs the 'before head' insertion mode 1731 * logic for the generalized WP_HTML_Processor::step() function. 1732 * 1733 * @since 6.7.0 1734 * @ignore 1735 * 1736 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. 1737 * 1738 * @see https://html.spec.whatwg.org/#the-before-head-insertion-mode 1739 * @see WP_HTML_Processor::step 1740 * 1741 * @return bool Whether an element was found. 1742 */ 1743 private function step_before_head(): bool { 1744 $token_name = $this->get_token_name(); 1745 $token_type = $this->get_token_type(); 1746 $is_closer = parent::is_tag_closer(); 1747 $op_sigil = '#tag' === $token_type ? ( $is_closer ? '-' : '+' ) : ''; 1748 $op = "{$op_sigil}{$token_name}"; 1749 1750 switch ( $op ) { 1751 /* 1752 * > A character token that is one of U+0009 CHARACTER TABULATION, 1753 * > U+000A LINE FEED (LF), U+000C FORM FEED (FF), 1754 * > U+000D CARRIAGE RETURN (CR), or U+0020 SPACE 1755 * 1756 * Parse error: ignore the token. 1757 */ 1758 case '#text': 1759 if ( parent::TEXT_IS_WHITESPACE === $this->text_node_classification ) { 1760 return $this->step(); 1761 } 1762 goto before_head_anything_else; 1763 break; 1764 1765 /* 1766 * > A comment token 1767 * > A processing instruction token 1768 */ 1769 case '#comment': 1770 case '#funky-comment': 1771 case '#presumptuous-tag': 1772 case '#processing-instruction': 1773 $this->insert_html_element( $this->state->current_token ); 1774 return true; 1775 1776 /* 1777 * > A DOCTYPE token 1778 */ 1779 case 'html': 1780 // Parse error: ignore the token. 1781 return $this->step(); 1782 1783 /* 1784 * > A start tag whose tag name is "html" 1785 */ 1786 case '+HTML': 1787 return $this->step_in_body(); 1788 1789 /* 1790 * > A start tag whose tag name is "head" 1791 */ 1792 case '+HEAD': 1793 $this->insert_html_element( $this->state->current_token ); 1794 $this->state->head_element = $this->state->current_token; 1795 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_HEAD; 1796 return true; 1797 1798 /* 1799 * > An end tag whose tag name is one of: "head", "body", "html", "br" 1800 * > Act as described in the "anything else" entry below. 1801 * 1802 * Closing BR tags are always reported by the Tag Processor as opening tags. 1803 */ 1804 case '-HEAD': 1805 case '-BODY': 1806 case '-HTML': 1807 goto before_head_anything_else; 1808 break; 1809 } 1810 1811 if ( $is_closer ) { 1812 // Parse error: ignore the token. 1813 return $this->step(); 1814 } 1815 1816 /* 1817 * > Anything else 1818 * 1819 * > Insert an HTML element for a "head" start tag token with no attributes. 1820 */ 1821 before_head_anything_else: 1822 $this->state->head_element = $this->insert_virtual_node( 'HEAD' ); 1823 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_HEAD; 1824 return $this->step( self::REPROCESS_CURRENT_NODE ); 1825 } 1826 1827 /** 1828 * Parses next element in the 'in head' insertion mode. 1829 * 1830 * This internal function performs the 'in head' insertion mode 1831 * logic for the generalized WP_HTML_Processor::step() function. 1832 * 1833 * @since 6.7.0 1834 * @ignore 1835 * 1836 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. 1837 * 1838 * @see https://html.spec.whatwg.org/multipage/parsing.html#parsing-main-inhead 1839 * @see WP_HTML_Processor::step 1840 * 1841 * @return bool Whether an element was found. 1842 */ 1843 private function step_in_head(): bool { 1844 $token_name = $this->get_token_name(); 1845 $token_type = $this->get_token_type(); 1846 $is_closer = parent::is_tag_closer(); 1847 $op_sigil = '#tag' === $token_type ? ( $is_closer ? '-' : '+' ) : ''; 1848 $op = "{$op_sigil}{$token_name}"; 1849 1850 switch ( $op ) { 1851 case '#text': 1852 /* 1853 * > A character token that is one of U+0009 CHARACTER TABULATION, 1854 * > U+000A LINE FEED (LF), U+000C FORM FEED (FF), 1855 * > U+000D CARRIAGE RETURN (CR), or U+0020 SPACE 1856 */ 1857 if ( parent::TEXT_IS_WHITESPACE === $this->text_node_classification ) { 1858 // Insert the character. 1859 $this->insert_html_element( $this->state->current_token ); 1860 return true; 1861 } 1862 1863 goto in_head_anything_else; 1864 break; 1865 1866 /* 1867 * > A comment token 1868 * > A processing instruction token 1869 */ 1870 case '#comment': 1871 case '#funky-comment': 1872 case '#presumptuous-tag': 1873 case '#processing-instruction': 1874 $this->insert_html_element( $this->state->current_token ); 1875 return true; 1876 1877 /* 1878 * > A DOCTYPE token 1879 */ 1880 case 'html': 1881 // Parse error: ignore the token. 1882 return $this->step(); 1883 1884 /* 1885 * > A start tag whose tag name is "html" 1886 */ 1887 case '+HTML': 1888 return $this->step_in_body(); 1889 1890 /* 1891 * > A start tag whose tag name is one of: "base", "basefont", "bgsound", "link" 1892 */ 1893 case '+BASE': 1894 case '+BASEFONT': 1895 case '+BGSOUND': 1896 case '+LINK': 1897 $this->insert_html_element( $this->state->current_token ); 1898 return true; 1899 1900 /* 1901 * > A start tag whose tag name is "meta" 1902 */ 1903 case '+META': 1904 $this->insert_html_element( $this->state->current_token ); 1905 1906 // All following conditions depend on "tentative" encoding confidence. 1907 if ( 'tentative' !== $this->state->encoding_confidence ) { 1908 return true; 1909 } 1910 1911 /* 1912 * > If the active speculative HTML parser is null, then: 1913 * > - If the element has a charset attribute, and getting an encoding from 1914 * > its value results in an encoding, and the confidence is currently 1915 * > tentative, then change the encoding to the resulting encoding. 1916 */ 1917 $charset = $this->get_attribute( 'charset' ); 1918 if ( is_string( $charset ) ) { 1919 $this->bail( 'Cannot yet process META tags with charset to determine encoding.' ); 1920 } 1921 1922 /* 1923 * > - Otherwise, if the element has an http-equiv attribute whose value is 1924 * > an ASCII case-insensitive match for the string "Content-Type", and 1925 * > the element has a content attribute, and applying the algorithm for 1926 * > extracting a character encoding from a meta element to that attribute's 1927 * > value returns an encoding, and the confidence is currently tentative, 1928 * > then change the encoding to the extracted encoding. 1929 */ 1930 $http_equiv = $this->get_attribute( 'http-equiv' ); 1931 $content = $this->get_attribute( 'content' ); 1932 if ( 1933 is_string( $http_equiv ) && 1934 is_string( $content ) && 1935 0 === strcasecmp( $http_equiv, 'Content-Type' ) 1936 ) { 1937 $this->bail( 'Cannot yet process META tags with http-equiv Content-Type to determine encoding.' ); 1938 } 1939 1940 return true; 1941 1942 /* 1943 * > A start tag whose tag name is "title" 1944 */ 1945 case '+TITLE': 1946 $this->insert_html_element( $this->state->current_token ); 1947 return true; 1948 1949 /* 1950 * > A start tag whose tag name is "noscript", if the scripting flag is enabled 1951 * > A start tag whose tag name is one of: "noframes", "style" 1952 * 1953 * The scripting flag is never enabled in this parser. 1954 */ 1955 case '+NOFRAMES': 1956 case '+STYLE': 1957 $this->insert_html_element( $this->state->current_token ); 1958 return true; 1959 1960 /* 1961 * > A start tag whose tag name is "noscript", if the scripting flag is disabled 1962 */ 1963 case '+NOSCRIPT': 1964 $this->insert_html_element( $this->state->current_token ); 1965 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_HEAD_NOSCRIPT; 1966 return true; 1967 1968 /* 1969 * > A start tag whose tag name is "script" 1970 * 1971 * @todo Could the adjusted insertion location be anything other than the current location? 1972 */ 1973 case '+SCRIPT': 1974 $this->insert_html_element( $this->state->current_token ); 1975 return true; 1976 1977 /* 1978 * > An end tag whose tag name is "head" 1979 */ 1980 case '-HEAD': 1981 $this->state->stack_of_open_elements->pop(); 1982 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_AFTER_HEAD; 1983 return true; 1984 1985 /* 1986 * > An end tag whose tag name is one of: "body", "html", "br" 1987 * 1988 * BR tags are always reported by the Tag Processor as opening tags. 1989 */ 1990 case '-BODY': 1991 case '-HTML': 1992 /* 1993 * > Act as described in the "anything else" entry below. 1994 */ 1995 goto in_head_anything_else; 1996 break; 1997 1998 /* 1999 * > A start tag whose tag name is "template" 2000 * 2001 * @todo Could the adjusted insertion location be anything other than the current location? 2002 */ 2003 case '+TEMPLATE': 2004 $this->state->active_formatting_elements->insert_marker(); 2005 $this->state->frameset_ok = false; 2006 2007 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TEMPLATE; 2008 $this->state->stack_of_template_insertion_modes[] = WP_HTML_Processor_State::INSERTION_MODE_IN_TEMPLATE; 2009 2010 $this->insert_html_element( $this->state->current_token ); 2011 return true; 2012 2013 /* 2014 * > An end tag whose tag name is "template" 2015 */ 2016 case '-TEMPLATE': 2017 if ( ! $this->state->stack_of_open_elements->contains( 'TEMPLATE' ) ) { 2018 // @todo Indicate a parse error once it's possible. 2019 return $this->step(); 2020 } 2021 2022 $this->generate_implied_end_tags_thoroughly(); 2023 if ( ! $this->state->stack_of_open_elements->current_node_is( 'TEMPLATE' ) ) { 2024 // @todo Indicate a parse error once it's possible. 2025 } 2026 2027 $this->state->stack_of_open_elements->pop_until( 'TEMPLATE' ); 2028 $this->state->active_formatting_elements->clear_up_to_last_marker(); 2029 array_pop( $this->state->stack_of_template_insertion_modes ); 2030 $this->reset_insertion_mode_appropriately(); 2031 return true; 2032 } 2033 2034 /* 2035 * > A start tag whose tag name is "head" 2036 * > Any other end tag 2037 */ 2038 if ( '+HEAD' === $op || $is_closer ) { 2039 // Parse error: ignore the token. 2040 return $this->step(); 2041 } 2042 2043 /* 2044 * > Anything else 2045 */ 2046 in_head_anything_else: 2047 $this->state->stack_of_open_elements->pop(); 2048 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_AFTER_HEAD; 2049 return $this->step( self::REPROCESS_CURRENT_NODE ); 2050 } 2051 2052 /** 2053 * Parses next element in the 'in head noscript' insertion mode. 2054 * 2055 * This internal function performs the 'in head noscript' insertion mode 2056 * logic for the generalized WP_HTML_Processor::step() function. 2057 * 2058 * @since 6.7.0 2059 * @ignore 2060 * 2061 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. 2062 * 2063 * @see https://html.spec.whatwg.org/#parsing-main-inheadnoscript 2064 * @see WP_HTML_Processor::step 2065 * 2066 * @return bool Whether an element was found. 2067 */ 2068 private function step_in_head_noscript(): bool { 2069 $token_name = $this->get_token_name(); 2070 $token_type = $this->get_token_type(); 2071 $is_closer = parent::is_tag_closer(); 2072 $op_sigil = '#tag' === $token_type ? ( $is_closer ? '-' : '+' ) : ''; 2073 $op = "{$op_sigil}{$token_name}"; 2074 2075 switch ( $op ) { 2076 /* 2077 * > A character token that is one of U+0009 CHARACTER TABULATION, 2078 * > U+000A LINE FEED (LF), U+000C FORM FEED (FF), 2079 * > U+000D CARRIAGE RETURN (CR), or U+0020 SPACE 2080 * 2081 * Parse error: ignore the token. 2082 */ 2083 case '#text': 2084 if ( parent::TEXT_IS_WHITESPACE === $this->text_node_classification ) { 2085 return $this->step_in_head(); 2086 } 2087 2088 goto in_head_noscript_anything_else; 2089 break; 2090 2091 /* 2092 * > A DOCTYPE token 2093 */ 2094 case 'html': 2095 // Parse error: ignore the token. 2096 return $this->step(); 2097 2098 /* 2099 * > A start tag whose tag name is "html" 2100 */ 2101 case '+HTML': 2102 return $this->step_in_body(); 2103 2104 /* 2105 * > An end tag whose tag name is "noscript" 2106 */ 2107 case '-NOSCRIPT': 2108 $this->state->stack_of_open_elements->pop(); 2109 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_HEAD; 2110 return true; 2111 2112 /* 2113 * > A comment token 2114 * > A processing instruction token 2115 * > A start tag whose tag name is one of: "basefont", "bgsound", 2116 * > "link", "meta", "noframes", "style" 2117 */ 2118 case '#comment': 2119 case '#funky-comment': 2120 case '#presumptuous-tag': 2121 case '#processing-instruction': 2122 case '+BASEFONT': 2123 case '+BGSOUND': 2124 case '+LINK': 2125 case '+META': 2126 case '+NOFRAMES': 2127 case '+STYLE': 2128 return $this->step_in_head(); 2129 2130 /* 2131 * > An end tag whose tag name is "br" 2132 * 2133 * This should never happen, as the Tag Processor prevents showing a BR closing tag. 2134 */ 2135 } 2136 2137 /* 2138 * > A start tag whose tag name is one of: "head", "noscript" 2139 * > Any other end tag 2140 */ 2141 if ( '+HEAD' === $op || '+NOSCRIPT' === $op || $is_closer ) { 2142 // Parse error: ignore the token. 2143 return $this->step(); 2144 } 2145 2146 /* 2147 * > Anything else 2148 * 2149 * Anything here is a parse error. 2150 */ 2151 in_head_noscript_anything_else: 2152 $this->state->stack_of_open_elements->pop(); 2153 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_HEAD; 2154 return $this->step( self::REPROCESS_CURRENT_NODE ); 2155 } 2156 2157 /** 2158 * Parses next element in the 'after head' insertion mode. 2159 * 2160 * This internal function performs the 'after head' insertion mode 2161 * logic for the generalized WP_HTML_Processor::step() function. 2162 * 2163 * @since 6.7.0 2164 * @ignore 2165 * 2166 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. 2167 * 2168 * @see https://html.spec.whatwg.org/#the-after-head-insertion-mode 2169 * @see WP_HTML_Processor::step 2170 * 2171 * @return bool Whether an element was found. 2172 */ 2173 private function step_after_head(): bool { 2174 $token_name = $this->get_token_name(); 2175 $token_type = $this->get_token_type(); 2176 $is_closer = parent::is_tag_closer(); 2177 $op_sigil = '#tag' === $token_type ? ( $is_closer ? '-' : '+' ) : ''; 2178 $op = "{$op_sigil}{$token_name}"; 2179 2180 switch ( $op ) { 2181 /* 2182 * > A character token that is one of U+0009 CHARACTER TABULATION, 2183 * > U+000A LINE FEED (LF), U+000C FORM FEED (FF), 2184 * > U+000D CARRIAGE RETURN (CR), or U+0020 SPACE 2185 */ 2186 case '#text': 2187 if ( parent::TEXT_IS_WHITESPACE === $this->text_node_classification ) { 2188 // Insert the character. 2189 $this->insert_html_element( $this->state->current_token ); 2190 return true; 2191 } 2192 goto after_head_anything_else; 2193 break; 2194 2195 /* 2196 * > A comment token 2197 * > A processing instruction token 2198 */ 2199 case '#comment': 2200 case '#funky-comment': 2201 case '#presumptuous-tag': 2202 case '#processing-instruction': 2203 $this->insert_html_element( $this->state->current_token ); 2204 return true; 2205 2206 /* 2207 * > A DOCTYPE token 2208 */ 2209 case 'html': 2210 // Parse error: ignore the token. 2211 return $this->step(); 2212 2213 /* 2214 * > A start tag whose tag name is "html" 2215 */ 2216 case '+HTML': 2217 return $this->step_in_body(); 2218 2219 /* 2220 * > A start tag whose tag name is "body" 2221 */ 2222 case '+BODY': 2223 $this->insert_html_element( $this->state->current_token ); 2224 $this->state->frameset_ok = false; 2225 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_BODY; 2226 return true; 2227 2228 /* 2229 * > A start tag whose tag name is "frameset" 2230 */ 2231 case '+FRAMESET': 2232 $this->insert_html_element( $this->state->current_token ); 2233 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_FRAMESET; 2234 return true; 2235 2236 /* 2237 * > A start tag whose tag name is one of: "base", "basefont", "bgsound", 2238 * > "link", "meta", "noframes", "script", "style", "template", "title" 2239 * 2240 * Anything here is a parse error. 2241 */ 2242 case '+BASE': 2243 case '+BASEFONT': 2244 case '+BGSOUND': 2245 case '+LINK': 2246 case '+META': 2247 case '+NOFRAMES': 2248 case '+SCRIPT': 2249 case '+STYLE': 2250 case '+TEMPLATE': 2251 case '+TITLE': 2252 /* 2253 * > Push the node pointed to by the head element pointer onto the stack of open elements. 2254 * > Process the token using the rules for the "in head" insertion mode. 2255 * > 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.) 2256 */ 2257 $this->bail( 'Cannot process elements after HEAD which reopen the HEAD element.' ); 2258 /* 2259 * Do not leave this break in when adding support; it's here to prevent 2260 * WPCS from getting confused at the switch structure without a return, 2261 * because it doesn't know that `bail()` always throws. 2262 */ 2263 break; 2264 2265 /* 2266 * > An end tag whose tag name is "template" 2267 */ 2268 case '-TEMPLATE': 2269 return $this->step_in_head(); 2270 2271 /* 2272 * > An end tag whose tag name is one of: "body", "html", "br" 2273 * 2274 * Closing BR tags are always reported by the Tag Processor as opening tags. 2275 */ 2276 case '-BODY': 2277 case '-HTML': 2278 /* 2279 * > Act as described in the "anything else" entry below. 2280 */ 2281 goto after_head_anything_else; 2282 break; 2283 } 2284 2285 /* 2286 * > A start tag whose tag name is "head" 2287 * > Any other end tag 2288 */ 2289 if ( '+HEAD' === $op || $is_closer ) { 2290 // Parse error: ignore the token. 2291 return $this->step(); 2292 } 2293 2294 /* 2295 * > Anything else 2296 * > Insert an HTML element for a "body" start tag token with no attributes. 2297 */ 2298 after_head_anything_else: 2299 $this->insert_virtual_node( 'BODY' ); 2300 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_BODY; 2301 return $this->step( self::REPROCESS_CURRENT_NODE ); 2302 } 2303 2304 /** 2305 * Parses next element in the 'in body' insertion mode. 2306 * 2307 * This internal function performs the 'in body' insertion mode 2308 * logic for the generalized WP_HTML_Processor::step() function. 2309 * 2310 * @since 6.4.0 2311 * @ignore 2312 * 2313 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. 2314 * 2315 * @see https://html.spec.whatwg.org/#parsing-main-inbody 2316 * @see WP_HTML_Processor::step 2317 * 2318 * @return bool Whether an element was found. 2319 */ 2320 private function step_in_body(): bool { 2321 $token_name = $this->get_token_name(); 2322 $token_type = $this->get_token_type(); 2323 $op_sigil = '#tag' === $token_type ? ( parent::is_tag_closer() ? '-' : '+' ) : ''; 2324 $op = "{$op_sigil}{$token_name}"; 2325 2326 switch ( $op ) { 2327 case '#text': 2328 /* 2329 * > A character token that is U+0000 NULL 2330 * 2331 * Any successive sequence of NULL bytes is ignored and won't 2332 * trigger active format reconstruction. Therefore, if the text 2333 * only comprises NULL bytes then the token should be ignored 2334 * here, but if there are any other characters in the stream 2335 * the active formats should be reconstructed. 2336 */ 2337 if ( parent::TEXT_IS_NULL_SEQUENCE === $this->text_node_classification ) { 2338 // Parse error: ignore the token. 2339 return $this->step(); 2340 } 2341 2342 $this->reconstruct_active_formatting_elements(); 2343 2344 /* 2345 * Whitespace-only text does not affect the frameset-ok flag. 2346 * It is probably inter-element whitespace, but it may also 2347 * contain character references which decode only to whitespace. 2348 */ 2349 if ( parent::TEXT_IS_GENERIC === $this->text_node_classification ) { 2350 $this->state->frameset_ok = false; 2351 } 2352 2353 $this->insert_html_element( $this->state->current_token ); 2354 return true; 2355 2356 case '#comment': 2357 case '#funky-comment': 2358 case '#presumptuous-tag': 2359 case '#processing-instruction': 2360 $this->insert_html_element( $this->state->current_token ); 2361 return true; 2362 2363 /* 2364 * > A DOCTYPE token 2365 * > Parse error. Ignore the token. 2366 */ 2367 case 'html': 2368 return $this->step(); 2369 2370 /* 2371 * > A start tag whose tag name is "html" 2372 */ 2373 case '+HTML': 2374 if ( ! $this->state->stack_of_open_elements->contains( 'TEMPLATE' ) ) { 2375 /* 2376 * > Otherwise, for each attribute on the token, check to see if the attribute 2377 * > is already present on the top element of the stack of open elements. If 2378 * > it is not, add the attribute and its corresponding value to that element. 2379 * 2380 * This parser does not currently support this behavior: ignore the token. 2381 */ 2382 } 2383 2384 // Ignore the token. 2385 return $this->step(); 2386 2387 /* 2388 * > A start tag whose tag name is one of: "base", "basefont", "bgsound", "link", 2389 * > "meta", "noframes", "script", "style", "template", "title" 2390 * > 2391 * > An end tag whose tag name is "template" 2392 */ 2393 case '+BASE': 2394 case '+BASEFONT': 2395 case '+BGSOUND': 2396 case '+LINK': 2397 case '+META': 2398 case '+NOFRAMES': 2399 case '+SCRIPT': 2400 case '+STYLE': 2401 case '+TEMPLATE': 2402 case '+TITLE': 2403 case '-TEMPLATE': 2404 return $this->step_in_head(); 2405 2406 /* 2407 * > A start tag whose tag name is "body" 2408 * 2409 * This tag in the IN BODY insertion mode is a parse error. 2410 */ 2411 case '+BODY': 2412 if ( 2413 1 === $this->state->stack_of_open_elements->count() || 2414 'BODY' !== ( $this->state->stack_of_open_elements->at( 2 )->node_name ?? null ) || 2415 $this->state->stack_of_open_elements->contains( 'TEMPLATE' ) 2416 ) { 2417 // Ignore the token. 2418 return $this->step(); 2419 } 2420 2421 /* 2422 * > Otherwise, set the frameset-ok flag to "not ok"; then, for each attribute 2423 * > on the token, check to see if the attribute is already present on the body 2424 * > element (the second element) on the stack of open elements, and if it is 2425 * > not, add the attribute and its corresponding value to that element. 2426 * 2427 * This parser does not currently support this behavior: ignore the token. 2428 */ 2429 $this->state->frameset_ok = false; 2430 return $this->step(); 2431 2432 /* 2433 * > A start tag whose tag name is "frameset" 2434 * 2435 * This tag in the IN BODY insertion mode is a parse error. 2436 */ 2437 case '+FRAMESET': 2438 if ( 2439 1 === $this->state->stack_of_open_elements->count() || 2440 'BODY' !== ( $this->state->stack_of_open_elements->at( 2 )->node_name ?? null ) || 2441 false === $this->state->frameset_ok 2442 ) { 2443 // Ignore the token. 2444 return $this->step(); 2445 } 2446 2447 /* 2448 * > Otherwise, run the following steps: 2449 */ 2450 $this->bail( 'Cannot process non-ignored FRAMESET tags.' ); 2451 break; 2452 2453 /* 2454 * > An end tag whose tag name is "body" 2455 */ 2456 case '-BODY': 2457 if ( ! $this->state->stack_of_open_elements->has_element_in_scope( 'BODY' ) ) { 2458 // Parse error: ignore the token. 2459 return $this->step(); 2460 } 2461 2462 /* 2463 * > Otherwise, if there is a node in the stack of open elements that is not either a 2464 * > dd element, a dt element, an li element, an optgroup element, an option element, 2465 * > a p element, an rb element, an rp element, an rt element, an rtc element, a tbody 2466 * > element, a td element, a tfoot element, a th element, a thread element, a tr 2467 * > element, the body element, or the html element, then this is a parse error. 2468 * 2469 * There is nothing to do for this parse error, so don't check for it. 2470 */ 2471 2472 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_AFTER_BODY; 2473 /* 2474 * The BODY element is not removed from the stack of open elements. 2475 * Only internal state has changed, this does not qualify as a "step" 2476 * in terms of advancing through the document to another token. 2477 * Nothing has been pushed or popped. 2478 * Proceed to parse the next item. 2479 */ 2480 return $this->step(); 2481 2482 /* 2483 * > An end tag whose tag name is "html" 2484 */ 2485 case '-HTML': 2486 if ( ! $this->state->stack_of_open_elements->has_element_in_scope( 'BODY' ) ) { 2487 // Parse error: ignore the token. 2488 return $this->step(); 2489 } 2490 2491 /* 2492 * > Otherwise, if there is a node in the stack of open elements that is not either a 2493 * > dd element, a dt element, an li element, an optgroup element, an option element, 2494 * > a p element, an rb element, an rp element, an rt element, an rtc element, a tbody 2495 * > element, a td element, a tfoot element, a th element, a thread element, a tr 2496 * > element, the body element, or the html element, then this is a parse error. 2497 * 2498 * There is nothing to do for this parse error, so don't check for it. 2499 */ 2500 2501 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_AFTER_BODY; 2502 return $this->step( self::REPROCESS_CURRENT_NODE ); 2503 2504 /* 2505 * > A start tag whose tag name is one of: "address", "article", "aside", 2506 * > "blockquote", "center", "details", "dialog", "dir", "div", "dl", 2507 * > "fieldset", "figcaption", "figure", "footer", "header", "hgroup", 2508 * > "main", "menu", "nav", "ol", "p", "search", "section", "summary", "ul" 2509 */ 2510 case '+ADDRESS': 2511 case '+ARTICLE': 2512 case '+ASIDE': 2513 case '+BLOCKQUOTE': 2514 case '+CENTER': 2515 case '+DETAILS': 2516 case '+DIALOG': 2517 case '+DIR': 2518 case '+DIV': 2519 case '+DL': 2520 case '+FIELDSET': 2521 case '+FIGCAPTION': 2522 case '+FIGURE': 2523 case '+FOOTER': 2524 case '+HEADER': 2525 case '+HGROUP': 2526 case '+MAIN': 2527 case '+MENU': 2528 case '+NAV': 2529 case '+OL': 2530 case '+P': 2531 case '+SEARCH': 2532 case '+SECTION': 2533 case '+SUMMARY': 2534 case '+UL': 2535 if ( $this->state->stack_of_open_elements->has_p_in_button_scope() ) { 2536 $this->close_a_p_element(); 2537 } 2538 2539 $this->insert_html_element( $this->state->current_token ); 2540 return true; 2541 2542 /* 2543 * > A start tag whose tag name is one of: "h1", "h2", "h3", "h4", "h5", "h6" 2544 */ 2545 case '+H1': 2546 case '+H2': 2547 case '+H3': 2548 case '+H4': 2549 case '+H5': 2550 case '+H6': 2551 if ( $this->state->stack_of_open_elements->has_p_in_button_scope() ) { 2552 $this->close_a_p_element(); 2553 } 2554 2555 if ( 2556 in_array( 2557 $this->state->stack_of_open_elements->current_node()->node_name, 2558 array( 'H1', 'H2', 'H3', 'H4', 'H5', 'H6' ), 2559 true 2560 ) 2561 ) { 2562 // @todo Indicate a parse error once it's possible. 2563 $this->state->stack_of_open_elements->pop(); 2564 } 2565 2566 $this->insert_html_element( $this->state->current_token ); 2567 return true; 2568 2569 /* 2570 * > A start tag whose tag name is one of: "pre", "listing" 2571 */ 2572 case '+PRE': 2573 case '+LISTING': 2574 if ( $this->state->stack_of_open_elements->has_p_in_button_scope() ) { 2575 $this->close_a_p_element(); 2576 } 2577 2578 /* 2579 * > If the next token is a U+000A LINE FEED (LF) character token, 2580 * > then ignore that token and move on to the next one. (Newlines 2581 * > at the start of pre blocks are ignored as an authoring convenience.) 2582 * 2583 * This is handled in `get_modifiable_text()`. 2584 */ 2585 2586 $this->insert_html_element( $this->state->current_token ); 2587 $this->state->frameset_ok = false; 2588 return true; 2589 2590 /* 2591 * > A start tag whose tag name is "form" 2592 */ 2593 case '+FORM': 2594 $stack_contains_template = $this->state->stack_of_open_elements->contains( 'TEMPLATE' ); 2595 2596 if ( isset( $this->state->form_element ) && ! $stack_contains_template ) { 2597 // Parse error: ignore the token. 2598 return $this->step(); 2599 } 2600 2601 if ( $this->state->stack_of_open_elements->has_p_in_button_scope() ) { 2602 $this->close_a_p_element(); 2603 } 2604 2605 $this->insert_html_element( $this->state->current_token ); 2606 if ( ! $stack_contains_template ) { 2607 $this->state->form_element = $this->state->current_token; 2608 } 2609 2610 return true; 2611 2612 /* 2613 * > A start tag whose tag name is "li" 2614 * > A start tag whose tag name is one of: "dd", "dt" 2615 */ 2616 case '+DD': 2617 case '+DT': 2618 case '+LI': 2619 $this->state->frameset_ok = false; 2620 $node = $this->state->stack_of_open_elements->current_node(); 2621 $is_li = 'LI' === $token_name; 2622 2623 in_body_list_loop: 2624 /* 2625 * The logic for LI and DT/DD is the same except for one point: LI elements _only_ 2626 * close other LI elements, but a DT or DD element closes _any_ open DT or DD element. 2627 */ 2628 if ( $is_li ? 'LI' === $node->node_name : ( 'DD' === $node->node_name || 'DT' === $node->node_name ) ) { 2629 $node_name = $is_li ? 'LI' : $node->node_name; 2630 $this->generate_implied_end_tags( $node_name ); 2631 if ( ! $this->state->stack_of_open_elements->current_node_is( $node_name ) ) { 2632 // @todo Indicate a parse error once it's possible. This error does not impact the logic here. 2633 } 2634 2635 $this->state->stack_of_open_elements->pop_until( $node_name ); 2636 goto in_body_list_done; 2637 } 2638 2639 if ( 2640 'ADDRESS' !== $node->node_name && 2641 'DIV' !== $node->node_name && 2642 'P' !== $node->node_name && 2643 self::is_special( $node ) 2644 ) { 2645 /* 2646 * > If node is in the special category, but is not an address, div, 2647 * > or p element, then jump to the step labeled done below. 2648 */ 2649 goto in_body_list_done; 2650 } else { 2651 /* 2652 * > Otherwise, set node to the previous entry in the stack of open elements 2653 * > and return to the step labeled loop. 2654 */ 2655 foreach ( $this->state->stack_of_open_elements->walk_up( $node ) as $item ) { 2656 $node = $item; 2657 break; 2658 } 2659 goto in_body_list_loop; 2660 } 2661 2662 in_body_list_done: 2663 if ( $this->state->stack_of_open_elements->has_p_in_button_scope() ) { 2664 $this->close_a_p_element(); 2665 } 2666 2667 $this->insert_html_element( $this->state->current_token ); 2668 return true; 2669 2670 case '+PLAINTEXT': 2671 if ( $this->state->stack_of_open_elements->has_p_in_button_scope() ) { 2672 $this->close_a_p_element(); 2673 } 2674 2675 /* 2676 * @todo This may need to be handled in the Tag Processor and turn into 2677 * a single self-contained tag like TEXTAREA, whose modifiable text 2678 * is the rest of the input document as plaintext. 2679 */ 2680 $this->bail( 'Cannot process PLAINTEXT elements.' ); 2681 break; 2682 2683 /* 2684 * > A start tag whose tag name is "button" 2685 */ 2686 case '+BUTTON': 2687 if ( $this->state->stack_of_open_elements->has_element_in_scope( 'BUTTON' ) ) { 2688 // @todo Indicate a parse error once it's possible. This error does not impact the logic here. 2689 $this->generate_implied_end_tags(); 2690 $this->state->stack_of_open_elements->pop_until( 'BUTTON' ); 2691 } 2692 2693 $this->reconstruct_active_formatting_elements(); 2694 $this->insert_html_element( $this->state->current_token ); 2695 $this->state->frameset_ok = false; 2696 2697 return true; 2698 2699 /* 2700 * > An end tag whose tag name is one of: "address", "article", "aside", "blockquote", 2701 * > "button", "center", "details", "dialog", "dir", "div", "dl", "fieldset", 2702 * > "figcaption", "figure", "footer", "header", "hgroup", "listing", "main", 2703 * > "menu", "nav", "ol", "pre", "search", "section", "select", "summary", "ul" 2704 */ 2705 case '-ADDRESS': 2706 case '-ARTICLE': 2707 case '-ASIDE': 2708 case '-BLOCKQUOTE': 2709 case '-BUTTON': 2710 case '-CENTER': 2711 case '-DETAILS': 2712 case '-DIALOG': 2713 case '-DIR': 2714 case '-DIV': 2715 case '-DL': 2716 case '-FIELDSET': 2717 case '-FIGCAPTION': 2718 case '-FIGURE': 2719 case '-FOOTER': 2720 case '-HEADER': 2721 case '-HGROUP': 2722 case '-LISTING': 2723 case '-MAIN': 2724 case '-MENU': 2725 case '-NAV': 2726 case '-OL': 2727 case '-PRE': 2728 case '-SEARCH': 2729 case '-SECTION': 2730 case '-SELECT': 2731 case '-SUMMARY': 2732 case '-UL': 2733 if ( ! $this->state->stack_of_open_elements->has_element_in_scope( $token_name ) ) { 2734 // @todo Report parse error. 2735 // Ignore the token. 2736 return $this->step(); 2737 } 2738 2739 $this->generate_implied_end_tags(); 2740 if ( ! $this->state->stack_of_open_elements->current_node_is( $token_name ) ) { 2741 // @todo Record parse error: this error doesn't impact parsing. 2742 } 2743 $this->state->stack_of_open_elements->pop_until( $token_name ); 2744 return true; 2745 2746 /* 2747 * > An end tag whose tag name is "form" 2748 */ 2749 case '-FORM': 2750 if ( ! $this->state->stack_of_open_elements->contains( 'TEMPLATE' ) ) { 2751 $node = $this->state->form_element; 2752 2753 /* 2754 * > If node is null or if the stack of open elements does not have node 2755 * > in scope, then this is a parse error; return and ignore the token. 2756 * 2757 * @todo It's necessary to check if the form token itself is in scope, not 2758 * simply whether any FORM is in scope. 2759 */ 2760 if ( 2761 null === $node || 2762 ! $this->state->stack_of_open_elements->has_element_in_scope( 'FORM' ) 2763 ) { 2764 /* 2765 * Parse error: ignore the token. 2766 * 2767 * Keep the form pointer intact when the end tag is ignored, such as 2768 * when a FORM closing tag appears inside an SVG TITLE integration 2769 * point. Otherwise the ignored token changes parser state in a way 2770 * that serialization cannot represent, allowing a later FORM opener 2771 * to appear in the first normalization pass and disappear on the second. 2772 */ 2773 return $this->step(); 2774 } 2775 2776 $this->state->form_element = null; 2777 2778 $this->generate_implied_end_tags(); 2779 if ( $node !== $this->state->stack_of_open_elements->current_node() ) { 2780 // @todo Indicate a parse error once it's possible. This error does not impact the logic here. 2781 $this->bail( 'Cannot close a FORM when other elements remain open as this would throw off the breadcrumbs for the following tokens.' ); 2782 } 2783 2784 $this->state->stack_of_open_elements->remove_node( $node ); 2785 return true; 2786 } else { 2787 /* 2788 * > If the stack of open elements does not have a form element in scope, 2789 * > then this is a parse error; return and ignore the token. 2790 * 2791 * Note that unlike in the clause above, this is checking for any FORM in scope. 2792 */ 2793 if ( ! $this->state->stack_of_open_elements->has_element_in_scope( 'FORM' ) ) { 2794 // Parse error: ignore the token. 2795 return $this->step(); 2796 } 2797 2798 $this->generate_implied_end_tags(); 2799 2800 if ( ! $this->state->stack_of_open_elements->current_node_is( 'FORM' ) ) { 2801 // @todo Indicate a parse error once it's possible. This error does not impact the logic here. 2802 } 2803 2804 $this->state->stack_of_open_elements->pop_until( 'FORM' ); 2805 return true; 2806 } 2807 break; 2808 2809 /* 2810 * > An end tag whose tag name is "p" 2811 */ 2812 case '-P': 2813 if ( ! $this->state->stack_of_open_elements->has_p_in_button_scope() ) { 2814 $this->insert_html_element( $this->state->current_token ); 2815 } 2816 2817 $this->close_a_p_element(); 2818 return true; 2819 2820 /* 2821 * > An end tag whose tag name is "li" 2822 * > An end tag whose tag name is one of: "dd", "dt" 2823 */ 2824 case '-DD': 2825 case '-DT': 2826 case '-LI': 2827 if ( 2828 /* 2829 * An end tag whose tag name is "li": 2830 * If the stack of open elements does not have an li element in list item scope, 2831 * then this is a parse error; ignore the token. 2832 */ 2833 ( 2834 'LI' === $token_name && 2835 ! $this->state->stack_of_open_elements->has_element_in_list_item_scope( 'LI' ) 2836 ) || 2837 /* 2838 * An end tag whose tag name is one of: "dd", "dt": 2839 * If the stack of open elements does not have an element in scope that is an 2840 * HTML element with the same tag name as that of the token, then this is a 2841 * parse error; ignore the token. 2842 */ 2843 ( 2844 'LI' !== $token_name && 2845 ! $this->state->stack_of_open_elements->has_element_in_scope( $token_name ) 2846 ) 2847 ) { 2848 /* 2849 * This is a parse error, ignore the token. 2850 * 2851 * @todo Indicate a parse error once it's possible. 2852 */ 2853 return $this->step(); 2854 } 2855 2856 $this->generate_implied_end_tags( $token_name ); 2857 2858 if ( ! $this->state->stack_of_open_elements->current_node_is( $token_name ) ) { 2859 // @todo Indicate a parse error once it's possible. This error does not impact the logic here. 2860 } 2861 2862 $this->state->stack_of_open_elements->pop_until( $token_name ); 2863 return true; 2864 2865 /* 2866 * > An end tag whose tag name is one of: "h1", "h2", "h3", "h4", "h5", "h6" 2867 */ 2868 case '-H1': 2869 case '-H2': 2870 case '-H3': 2871 case '-H4': 2872 case '-H5': 2873 case '-H6': 2874 if ( ! $this->state->stack_of_open_elements->has_element_in_scope( '(internal: H1 through H6 - do not use)' ) ) { 2875 /* 2876 * This is a parse error; ignore the token. 2877 * 2878 * @todo Indicate a parse error once it's possible. 2879 */ 2880 return $this->step(); 2881 } 2882 2883 $this->generate_implied_end_tags(); 2884 2885 if ( ! $this->state->stack_of_open_elements->current_node_is( $token_name ) ) { 2886 // @todo Record parse error: this error doesn't impact parsing. 2887 } 2888 2889 $this->state->stack_of_open_elements->pop_until( '(internal: H1 through H6 - do not use)' ); 2890 return true; 2891 2892 /* 2893 * > A start tag whose tag name is "a" 2894 */ 2895 case '+A': 2896 foreach ( $this->state->active_formatting_elements->walk_up() as $item ) { 2897 switch ( $item->node_name ) { 2898 case 'marker': 2899 break 2; 2900 2901 case 'A': 2902 $this->run_adoption_agency_algorithm(); 2903 $this->state->active_formatting_elements->remove_node( $item ); 2904 $this->state->stack_of_open_elements->remove_node( $item ); 2905 break 2; 2906 } 2907 } 2908 2909 $this->reconstruct_active_formatting_elements(); 2910 $this->insert_html_element( $this->state->current_token ); 2911 $this->state->active_formatting_elements->push( $this->state->current_token ); 2912 return true; 2913 2914 /* 2915 * > A start tag whose tag name is one of: "b", "big", "code", "em", "font", "i", 2916 * > "s", "small", "strike", "strong", "tt", "u" 2917 */ 2918 case '+B': 2919 case '+BIG': 2920 case '+CODE': 2921 case '+EM': 2922 case '+FONT': 2923 case '+I': 2924 case '+S': 2925 case '+SMALL': 2926 case '+STRIKE': 2927 case '+STRONG': 2928 case '+TT': 2929 case '+U': 2930 $this->reconstruct_active_formatting_elements(); 2931 $this->insert_html_element( $this->state->current_token ); 2932 $this->state->active_formatting_elements->push( $this->state->current_token ); 2933 return true; 2934 2935 /* 2936 * > A start tag whose tag name is "nobr" 2937 */ 2938 case '+NOBR': 2939 $this->reconstruct_active_formatting_elements(); 2940 2941 if ( $this->state->stack_of_open_elements->has_element_in_scope( 'NOBR' ) ) { 2942 // Parse error. 2943 $this->run_adoption_agency_algorithm(); 2944 $this->reconstruct_active_formatting_elements(); 2945 } 2946 2947 $this->insert_html_element( $this->state->current_token ); 2948 $this->state->active_formatting_elements->push( $this->state->current_token ); 2949 return true; 2950 2951 /* 2952 * > An end tag whose tag name is one of: "a", "b", "big", "code", "em", "font", "i", 2953 * > "nobr", "s", "small", "strike", "strong", "tt", "u" 2954 */ 2955 case '-A': 2956 case '-B': 2957 case '-BIG': 2958 case '-CODE': 2959 case '-EM': 2960 case '-FONT': 2961 case '-I': 2962 case '-NOBR': 2963 case '-S': 2964 case '-SMALL': 2965 case '-STRIKE': 2966 case '-STRONG': 2967 case '-TT': 2968 case '-U': 2969 $this->run_adoption_agency_algorithm(); 2970 return true; 2971 2972 /* 2973 * > A start tag whose tag name is one of: "applet", "marquee", "object" 2974 */ 2975 case '+APPLET': 2976 case '+MARQUEE': 2977 case '+OBJECT': 2978 $this->reconstruct_active_formatting_elements(); 2979 $this->insert_html_element( $this->state->current_token ); 2980 $this->state->active_formatting_elements->insert_marker(); 2981 $this->state->frameset_ok = false; 2982 return true; 2983 2984 /* 2985 * > A end tag token whose tag name is one of: "applet", "marquee", "object" 2986 */ 2987 case '-APPLET': 2988 case '-MARQUEE': 2989 case '-OBJECT': 2990 if ( ! $this->state->stack_of_open_elements->has_element_in_scope( $token_name ) ) { 2991 // Parse error: ignore the token. 2992 return $this->step(); 2993 } 2994 2995 $this->generate_implied_end_tags(); 2996 if ( ! $this->state->stack_of_open_elements->current_node_is( $token_name ) ) { 2997 // This is a parse error. 2998 } 2999 3000 $this->state->stack_of_open_elements->pop_until( $token_name ); 3001 $this->state->active_formatting_elements->clear_up_to_last_marker(); 3002 return true; 3003 3004 /* 3005 * > A start tag whose tag name is "table" 3006 */ 3007 case '+TABLE': 3008 /* 3009 * > If the Document is not set to quirks mode, and the stack of open elements 3010 * > has a p element in button scope, then close a p element. 3011 */ 3012 if ( 3013 WP_HTML_Tag_Processor::QUIRKS_MODE !== $this->compat_mode && 3014 $this->state->stack_of_open_elements->has_p_in_button_scope() 3015 ) { 3016 $this->close_a_p_element(); 3017 } 3018 3019 $this->insert_html_element( $this->state->current_token ); 3020 $this->state->frameset_ok = false; 3021 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE; 3022 return true; 3023 3024 /* 3025 * > An end tag whose tag name is "br" 3026 * 3027 * This is prevented from happening because the Tag Processor 3028 * reports all closing BR tags as if they were opening tags. 3029 */ 3030 3031 /* 3032 * > A start tag whose tag name is one of: "area", "br", "embed", "img", "keygen", "wbr" 3033 */ 3034 case '+AREA': 3035 case '+BR': 3036 case '+EMBED': 3037 case '+IMG': 3038 case '+KEYGEN': 3039 case '+WBR': 3040 $this->reconstruct_active_formatting_elements(); 3041 $this->insert_html_element( $this->state->current_token ); 3042 $this->state->frameset_ok = false; 3043 return true; 3044 3045 /* 3046 * > A start tag whose tag name is "input" 3047 */ 3048 case '+INPUT': 3049 /* 3050 * > If the parser was created as part of the HTML fragment parsing algorithm 3051 * > (fragment case) and the context element passed to that algorithm is a 3052 * > select element: 3053 * > 1. Parse error. 3054 * > 2. Ignore the token. 3055 * > 3. Return. 3056 */ 3057 if ( isset( $this->context_node ) && 'SELECT' === $this->context_node->node_name ) { 3058 return $this->step(); 3059 } 3060 3061 /* 3062 * > If the stack of open elements has a select element in scope: 3063 * > 1. Parse error. 3064 * > 2. Pop elements from the stack of open elements until a select element 3065 * > has been popped from the stack. 3066 */ 3067 if ( $this->state->stack_of_open_elements->has_element_in_scope( 'SELECT' ) ) { 3068 $this->state->stack_of_open_elements->pop_until( 'SELECT' ); 3069 } 3070 3071 $this->reconstruct_active_formatting_elements(); 3072 $this->insert_html_element( $this->state->current_token ); 3073 3074 /* 3075 * > If the token does not have an attribute with the name "type", or if it does, 3076 * > but that attribute's value is not an ASCII case-insensitive match for the 3077 * > string "hidden", then: set the frameset-ok flag to "not ok". 3078 */ 3079 $type_attribute = $this->get_attribute( 'type' ); 3080 if ( ! is_string( $type_attribute ) || 'hidden' !== strtolower( $type_attribute ) ) { 3081 $this->state->frameset_ok = false; 3082 } 3083 3084 return true; 3085 3086 /* 3087 * > A start tag whose tag name is one of: "param", "source", "track" 3088 */ 3089 case '+PARAM': 3090 case '+SOURCE': 3091 case '+TRACK': 3092 $this->insert_html_element( $this->state->current_token ); 3093 return true; 3094 3095 /* 3096 * > A start tag whose tag name is "hr" 3097 */ 3098 case '+HR': 3099 if ( $this->state->stack_of_open_elements->has_p_in_button_scope() ) { 3100 $this->close_a_p_element(); 3101 } 3102 3103 if ( $this->state->stack_of_open_elements->has_element_in_scope( 'SELECT' ) ) { 3104 $this->generate_implied_end_tags(); 3105 /* 3106 * > If the stack of open elements has an option element in scope or has 3107 * > an optgroup element in scope, then this is a parse error. 3108 * 3109 * @todo Indicate a parse error once it's possible. 3110 */ 3111 } 3112 3113 $this->insert_html_element( $this->state->current_token ); 3114 $this->state->frameset_ok = false; 3115 return true; 3116 3117 /* 3118 * > A start tag whose tag name is "image" 3119 */ 3120 case '+IMAGE': 3121 /* 3122 * > Parse error. Change the token's tag name to "img" and reprocess it. (Don't ask.) 3123 * 3124 * Note that this is handled elsewhere, so it should not be possible to reach this code. 3125 */ 3126 $this->bail( "Cannot process an IMAGE tag. (Don't ask.)" ); 3127 break; 3128 3129 /* 3130 * > A start tag whose tag name is "textarea" 3131 */ 3132 case '+TEXTAREA': 3133 $this->insert_html_element( $this->state->current_token ); 3134 3135 /* 3136 * > If the next token is a U+000A LINE FEED (LF) character token, then ignore 3137 * > that token and move on to the next one. (Newlines at the start of 3138 * > textarea elements are ignored as an authoring convenience.) 3139 * 3140 * This is handled in `get_modifiable_text()`. 3141 */ 3142 3143 $this->state->frameset_ok = false; 3144 3145 /* 3146 * > Switch the insertion mode to "text". 3147 * 3148 * As a self-contained node, this behavior is handled in the Tag Processor. 3149 */ 3150 return true; 3151 3152 /* 3153 * > A start tag whose tag name is "xmp" 3154 */ 3155 case '+XMP': 3156 if ( $this->state->stack_of_open_elements->has_p_in_button_scope() ) { 3157 $this->close_a_p_element(); 3158 } 3159 3160 $this->reconstruct_active_formatting_elements(); 3161 $this->state->frameset_ok = false; 3162 3163 /* 3164 * > Follow the generic raw text element parsing algorithm. 3165 * 3166 * As a self-contained node, this behavior is handled in the Tag Processor. 3167 */ 3168 $this->insert_html_element( $this->state->current_token ); 3169 return true; 3170 3171 /* 3172 * A start tag whose tag name is "iframe" 3173 */ 3174 case '+IFRAME': 3175 $this->state->frameset_ok = false; 3176 3177 /* 3178 * > Follow the generic raw text element parsing algorithm. 3179 * 3180 * As a self-contained node, this behavior is handled in the Tag Processor. 3181 */ 3182 $this->insert_html_element( $this->state->current_token ); 3183 return true; 3184 3185 /* 3186 * > A start tag whose tag name is "noembed" 3187 * > A start tag whose tag name is "noscript", if the scripting flag is enabled 3188 * 3189 * The scripting flag is never enabled in this parser. 3190 */ 3191 case '+NOEMBED': 3192 $this->insert_html_element( $this->state->current_token ); 3193 return true; 3194 3195 /* 3196 * > A start tag whose tag name is "select" 3197 */ 3198 case '+SELECT': 3199 /* 3200 * > If the parser was created as part of the HTML fragment parsing algorithm 3201 * > (fragment case) and the context element passed to that algorithm is a 3202 * > select element: 3203 * > 1. Parse error. 3204 * > 2. Ignore the token. 3205 */ 3206 if ( isset( $this->context_node ) && 'SELECT' === $this->context_node->node_name ) { 3207 // @todo Indicate a parse error once it's possible. 3208 return $this->step(); 3209 } 3210 /* 3211 * > Otherwise, if the stack of open elements has a select element in scope: 3212 * > 1. Parse error. 3213 * > 2. Ignore the token. 3214 * > 3. Pop elements from the stack of open elements until a select element 3215 * > has been popped from the stack. 3216 */ 3217 if ( $this->state->stack_of_open_elements->has_element_in_scope( 'SELECT' ) ) { 3218 // @todo Indicate a parse error once it's possible. 3219 $this->state->stack_of_open_elements->pop_until( 'SELECT' ); 3220 return $this->step(); 3221 } 3222 3223 $this->reconstruct_active_formatting_elements(); 3224 $this->insert_html_element( $this->state->current_token ); 3225 $this->state->frameset_ok = false; 3226 return true; 3227 3228 /* 3229 * > A start tag whose tag name is "option" 3230 */ 3231 case '+OPTION': 3232 if ( $this->state->stack_of_open_elements->has_element_in_scope( 'SELECT' ) ) { 3233 $this->generate_implied_end_tags( 'OPTGROUP' ); 3234 /* 3235 * > If the stack of open elements has an option element in scope, then this 3236 * > is a parse error. 3237 * @todo Indicate a parse error once it's possible. 3238 */ 3239 } elseif ( $this->state->stack_of_open_elements->current_node_is( 'OPTION' ) ) { 3240 $this->state->stack_of_open_elements->pop(); 3241 } 3242 3243 $this->reconstruct_active_formatting_elements(); 3244 $this->insert_html_element( $this->state->current_token ); 3245 return true; 3246 3247 /* 3248 * > A start tag whose tag name is "optgroup" 3249 */ 3250 case '+OPTGROUP': 3251 if ( $this->state->stack_of_open_elements->has_element_in_scope( 'SELECT' ) ) { 3252 $this->generate_implied_end_tags(); 3253 /* 3254 * > If the stack of open elements has an option element in scope or has an 3255 * > optgroup element in scope, then this is a parse error. 3256 * @todo Indicate a parse error once it's possible. 3257 */ 3258 } elseif ( $this->state->stack_of_open_elements->current_node_is( 'OPTION' ) ) { 3259 $this->state->stack_of_open_elements->pop(); 3260 } 3261 3262 $this->reconstruct_active_formatting_elements(); 3263 $this->insert_html_element( $this->state->current_token ); 3264 return true; 3265 3266 /* 3267 * > A start tag whose tag name is one of: "rb", "rtc" 3268 */ 3269 case '+RB': 3270 case '+RTC': 3271 if ( $this->state->stack_of_open_elements->has_element_in_scope( 'RUBY' ) ) { 3272 $this->generate_implied_end_tags(); 3273 3274 if ( $this->state->stack_of_open_elements->current_node_is( 'RUBY' ) ) { 3275 // @todo Indicate a parse error once it's possible. 3276 } 3277 } 3278 3279 $this->insert_html_element( $this->state->current_token ); 3280 return true; 3281 3282 /* 3283 * > A start tag whose tag name is one of: "rp", "rt" 3284 */ 3285 case '+RP': 3286 case '+RT': 3287 if ( $this->state->stack_of_open_elements->has_element_in_scope( 'RUBY' ) ) { 3288 $this->generate_implied_end_tags( 'RTC' ); 3289 3290 $current_node_name = $this->state->stack_of_open_elements->current_node()->node_name; 3291 if ( 'RTC' === $current_node_name || 'RUBY' === $current_node_name ) { 3292 // @todo Indicate a parse error once it's possible. 3293 } 3294 } 3295 3296 $this->insert_html_element( $this->state->current_token ); 3297 return true; 3298 3299 /* 3300 * > A start tag whose tag name is "math" 3301 */ 3302 case '+MATH': 3303 $this->reconstruct_active_formatting_elements(); 3304 3305 /* 3306 * @todo Adjust MathML attributes for the token. (This fixes the case of MathML attributes that are not all lowercase.) 3307 * @todo Adjust foreign attributes for the token. (This fixes the use of namespaced attributes, in particular XLink.) 3308 * 3309 * These ought to be handled in the attribute methods. 3310 */ 3311 $this->state->current_token->namespace = 'math'; 3312 $this->insert_html_element( $this->state->current_token ); 3313 if ( $this->state->current_token->has_self_closing_flag ) { 3314 $this->state->stack_of_open_elements->pop(); 3315 } 3316 return true; 3317 3318 /* 3319 * > A start tag whose tag name is "svg" 3320 */ 3321 case '+SVG': 3322 $this->reconstruct_active_formatting_elements(); 3323 3324 /* 3325 * @todo Adjust SVG attributes for the token. (This fixes the case of SVG attributes that are not all lowercase.) 3326 * @todo Adjust foreign attributes for the token. (This fixes the use of namespaced attributes, in particular XLink in SVG.) 3327 * 3328 * These ought to be handled in the attribute methods. 3329 */ 3330 $this->state->current_token->namespace = 'svg'; 3331 $this->insert_html_element( $this->state->current_token ); 3332 if ( $this->state->current_token->has_self_closing_flag ) { 3333 $this->state->stack_of_open_elements->pop(); 3334 } 3335 return true; 3336 3337 /* 3338 * > A start tag whose tag name is one of: "caption", "col", "colgroup", 3339 * > "frame", "head", "tbody", "td", "tfoot", "th", "thead", "tr" 3340 */ 3341 case '+CAPTION': 3342 case '+COL': 3343 case '+COLGROUP': 3344 case '+FRAME': 3345 case '+HEAD': 3346 case '+TBODY': 3347 case '+TD': 3348 case '+TFOOT': 3349 case '+TH': 3350 case '+THEAD': 3351 case '+TR': 3352 // Parse error. Ignore the token. 3353 return $this->step(); 3354 } 3355 3356 if ( ! parent::is_tag_closer() ) { 3357 /* 3358 * > Any other start tag 3359 */ 3360 $this->reconstruct_active_formatting_elements(); 3361 $this->insert_html_element( $this->state->current_token ); 3362 return true; 3363 } else { 3364 /* 3365 * > Any other end tag 3366 */ 3367 return $this->in_body_any_other_end_tag(); 3368 } 3369 3370 $this->bail( 'Should not have been able to reach end of IN BODY processing. Check HTML API code.' ); 3371 // This unnecessary return prevents tools from inaccurately reporting type errors. 3372 return false; 3373 } 3374 3375 /** 3376 * Applies the "any other end tag" parsing instructions for the IN BODY insertion mode. 3377 * 3378 * @since 7.1.0 3379 * @ignore 3380 * 3381 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. 3382 * 3383 * @see https://html.spec.whatwg.org/#parsing-main-inbody 3384 * @see WP_HTML_Processor::step_in_body 3385 * 3386 * @return bool Whether an element was found. 3387 */ 3388 private function in_body_any_other_end_tag(): bool { 3389 $token_name = $this->get_token_name(); 3390 3391 /* 3392 * Find the corresponding tag opener in the stack of open elements, if 3393 * it exists before reaching a special element, which provides a kind 3394 * of boundary in the stack. For example, a `</custom-tag>` should not 3395 * close anything beyond its containing `P` or `DIV` element. 3396 */ 3397 foreach ( $this->state->stack_of_open_elements->walk_up() as $node ) { 3398 if ( 'html' === $node->namespace && $token_name === $node->node_name ) { 3399 break; 3400 } 3401 3402 if ( self::is_special( $node ) ) { 3403 // This is a parse error, ignore the token. 3404 return $this->step(); 3405 } 3406 } 3407 3408 $this->generate_implied_end_tags( $token_name ); 3409 if ( $node !== $this->state->stack_of_open_elements->current_node() ) { 3410 // @todo Record parse error: this error doesn't impact parsing. 3411 } 3412 3413 foreach ( $this->state->stack_of_open_elements->walk_up() as $item ) { 3414 $this->state->stack_of_open_elements->pop(); 3415 if ( $node === $item ) { 3416 return true; 3417 } 3418 } 3419 3420 $this->bail( 'Should not have been able to reach end of "any other end tag" IN BODY processing. Check HTML API code.' ); 3421 // This unnecessary return prevents tools from inaccurately reporting type errors. 3422 return false; 3423 } 3424 3425 /** 3426 * Parses next element in the 'in table' insertion mode. 3427 * 3428 * This internal function performs the 'in table' insertion mode 3429 * logic for the generalized WP_HTML_Processor::step() function. 3430 * 3431 * @since 6.7.0 3432 * @ignore 3433 * 3434 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. 3435 * 3436 * @see https://html.spec.whatwg.org/#parsing-main-intable 3437 * @see WP_HTML_Processor::step 3438 * 3439 * @return bool Whether an element was found. 3440 */ 3441 private function step_in_table(): bool { 3442 $token_name = $this->get_token_name(); 3443 $token_type = $this->get_token_type(); 3444 $op_sigil = '#tag' === $token_type ? ( parent::is_tag_closer() ? '-' : '+' ) : ''; 3445 $op = "{$op_sigil}{$token_name}"; 3446 3447 switch ( $op ) { 3448 /* 3449 * > A character token, if the current node is table, 3450 * > tbody, template, tfoot, thead, or tr element 3451 */ 3452 case '#text': 3453 $current_node = $this->state->stack_of_open_elements->current_node(); 3454 $current_node_name = $current_node ? $current_node->node_name : null; 3455 if ( 3456 $current_node_name && ( 3457 'TABLE' === $current_node_name || 3458 'TBODY' === $current_node_name || 3459 'TEMPLATE' === $current_node_name || 3460 'TFOOT' === $current_node_name || 3461 'THEAD' === $current_node_name || 3462 'TR' === $current_node_name 3463 ) 3464 ) { 3465 /* 3466 * If the text is empty after processing HTML entities and stripping 3467 * U+0000 NULL bytes then ignore the token. 3468 */ 3469 if ( parent::TEXT_IS_NULL_SEQUENCE === $this->text_node_classification ) { 3470 return $this->step(); 3471 } 3472 3473 /* 3474 * This follows the rules for "in table text" insertion mode. 3475 * 3476 * Whitespace-only text nodes are inserted in-place. Otherwise 3477 * foster parenting is enabled and the nodes would be 3478 * inserted out-of-place. 3479 * 3480 * > If any of the tokens in the pending table character tokens 3481 * > list are character tokens that are not ASCII whitespace, 3482 * > then this is a parse error: reprocess the character tokens 3483 * > in the pending table character tokens list using the rules 3484 * > given in the "anything else" entry in the "in table" 3485 * > insertion mode. 3486 * > 3487 * > Otherwise, insert the characters given by the pending table 3488 * > character tokens list. 3489 * 3490 * @see https://html.spec.whatwg.org/#parsing-main-intabletext 3491 */ 3492 if ( parent::TEXT_IS_WHITESPACE === $this->text_node_classification ) { 3493 $this->insert_html_element( $this->state->current_token ); 3494 return true; 3495 } 3496 3497 // Non-whitespace would trigger fostering, unsupported at this time. 3498 $this->bail( 'Foster parenting is not supported.' ); 3499 break; 3500 } 3501 break; 3502 3503 /* 3504 * > A comment token 3505 * > A processing instruction token 3506 */ 3507 case '#comment': 3508 case '#funky-comment': 3509 case '#presumptuous-tag': 3510 case '#processing-instruction': 3511 $this->insert_html_element( $this->state->current_token ); 3512 return true; 3513 3514 /* 3515 * > A DOCTYPE token 3516 */ 3517 case 'html': 3518 // Parse error: ignore the token. 3519 return $this->step(); 3520 3521 /* 3522 * > A start tag whose tag name is "caption" 3523 */ 3524 case '+CAPTION': 3525 $this->state->stack_of_open_elements->clear_to_table_context(); 3526 $this->state->active_formatting_elements->insert_marker(); 3527 $this->insert_html_element( $this->state->current_token ); 3528 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_CAPTION; 3529 return true; 3530 3531 /* 3532 * > A start tag whose tag name is "colgroup" 3533 */ 3534 case '+COLGROUP': 3535 $this->state->stack_of_open_elements->clear_to_table_context(); 3536 $this->insert_html_element( $this->state->current_token ); 3537 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_COLUMN_GROUP; 3538 return true; 3539 3540 /* 3541 * > A start tag whose tag name is "col" 3542 */ 3543 case '+COL': 3544 $this->state->stack_of_open_elements->clear_to_table_context(); 3545 3546 /* 3547 * > Insert an HTML element for a "colgroup" start tag token with no attributes, 3548 * > then switch the insertion mode to "in column group". 3549 */ 3550 $this->insert_virtual_node( 'COLGROUP' ); 3551 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_COLUMN_GROUP; 3552 return $this->step( self::REPROCESS_CURRENT_NODE ); 3553 3554 /* 3555 * > A start tag whose tag name is one of: "tbody", "tfoot", "thead" 3556 */ 3557 case '+TBODY': 3558 case '+TFOOT': 3559 case '+THEAD': 3560 $this->state->stack_of_open_elements->clear_to_table_context(); 3561 $this->insert_html_element( $this->state->current_token ); 3562 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE_BODY; 3563 return true; 3564 3565 /* 3566 * > A start tag whose tag name is one of: "td", "th", "tr" 3567 */ 3568 case '+TD': 3569 case '+TH': 3570 case '+TR': 3571 $this->state->stack_of_open_elements->clear_to_table_context(); 3572 /* 3573 * > Insert an HTML element for a "tbody" start tag token with no attributes, 3574 * > then switch the insertion mode to "in table body". 3575 */ 3576 $this->insert_virtual_node( 'TBODY' ); 3577 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE_BODY; 3578 return $this->step( self::REPROCESS_CURRENT_NODE ); 3579 3580 /* 3581 * > A start tag whose tag name is "table" 3582 * 3583 * This tag in the IN TABLE insertion mode is a parse error. 3584 */ 3585 case '+TABLE': 3586 if ( ! $this->state->stack_of_open_elements->has_element_in_table_scope( 'TABLE' ) ) { 3587 return $this->step(); 3588 } 3589 3590 $this->state->stack_of_open_elements->pop_until( 'TABLE' ); 3591 $this->reset_insertion_mode_appropriately(); 3592 return $this->step( self::REPROCESS_CURRENT_NODE ); 3593 3594 /* 3595 * > An end tag whose tag name is "table" 3596 */ 3597 case '-TABLE': 3598 if ( ! $this->state->stack_of_open_elements->has_element_in_table_scope( 'TABLE' ) ) { 3599 // @todo Indicate a parse error once it's possible. 3600 return $this->step(); 3601 } 3602 3603 $this->state->stack_of_open_elements->pop_until( 'TABLE' ); 3604 $this->reset_insertion_mode_appropriately(); 3605 return true; 3606 3607 /* 3608 * > An end tag whose tag name is one of: "body", "caption", "col", "colgroup", "html", "tbody", "td", "tfoot", "th", "thead", "tr" 3609 */ 3610 case '-BODY': 3611 case '-CAPTION': 3612 case '-COL': 3613 case '-COLGROUP': 3614 case '-HTML': 3615 case '-TBODY': 3616 case '-TD': 3617 case '-TFOOT': 3618 case '-TH': 3619 case '-THEAD': 3620 case '-TR': 3621 // Parse error: ignore the token. 3622 return $this->step(); 3623 3624 /* 3625 * > A start tag whose tag name is one of: "style", "script", "template" 3626 * > An end tag whose tag name is "template" 3627 */ 3628 case '+STYLE': 3629 case '+SCRIPT': 3630 case '+TEMPLATE': 3631 case '-TEMPLATE': 3632 /* 3633 * > Process the token using the rules for the "in head" insertion mode. 3634 */ 3635 return $this->step_in_head(); 3636 3637 /* 3638 * > A start tag whose tag name is "input" 3639 * 3640 * > If the token does not have an attribute with the name "type", or if it does, but 3641 * > that attribute's value is not an ASCII case-insensitive match for the string 3642 * > "hidden", then: act as described in the "anything else" entry below. 3643 */ 3644 case '+INPUT': 3645 $type_attribute = $this->get_attribute( 'type' ); 3646 if ( ! is_string( $type_attribute ) || 'hidden' !== strtolower( $type_attribute ) ) { 3647 goto anything_else; 3648 } 3649 // @todo Indicate a parse error once it's possible. 3650 $this->insert_html_element( $this->state->current_token ); 3651 return true; 3652 3653 /* 3654 * > A start tag whose tag name is "form" 3655 * 3656 * This tag in the IN TABLE insertion mode is a parse error. 3657 */ 3658 case '+FORM': 3659 if ( 3660 $this->state->stack_of_open_elements->has_element_in_scope( 'TEMPLATE' ) || 3661 isset( $this->state->form_element ) 3662 ) { 3663 return $this->step(); 3664 } 3665 3666 // This FORM is special because it immediately closes and cannot have other children. 3667 $this->insert_html_element( $this->state->current_token ); 3668 $this->state->form_element = $this->state->current_token; 3669 $this->state->stack_of_open_elements->pop(); 3670 return true; 3671 } 3672 3673 /* 3674 * > Anything else 3675 * > Parse error. Enable foster parenting, process the token using the rules for the 3676 * > "in body" insertion mode, and then disable foster parenting. 3677 * 3678 * @todo Indicate a parse error once it's possible. 3679 */ 3680 anything_else: 3681 $this->bail( 'Foster parenting is not supported.' ); 3682 } 3683 3684 /** 3685 * Parses next element in the 'in table text' insertion mode. 3686 * 3687 * This internal function performs the 'in table text' insertion mode 3688 * logic for the generalized WP_HTML_Processor::step() function. 3689 * 3690 * @since 6.7.0 Stub implementation. 3691 * @ignore 3692 * 3693 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. 3694 * 3695 * @see https://html.spec.whatwg.org/#parsing-main-intabletext 3696 * @see WP_HTML_Processor::step 3697 * 3698 * @return bool Whether an element was found. 3699 */ 3700 private function step_in_table_text(): bool { 3701 $this->bail( 'No support for parsing in the ' . WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE_TEXT . ' state.' ); 3702 } 3703 3704 /** 3705 * Parses next element in the 'in caption' insertion mode. 3706 * 3707 * This internal function performs the 'in caption' insertion mode 3708 * logic for the generalized WP_HTML_Processor::step() function. 3709 * 3710 * @since 6.7.0 3711 * @ignore 3712 * 3713 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. 3714 * 3715 * @see https://html.spec.whatwg.org/#parsing-main-incaption 3716 * @see WP_HTML_Processor::step 3717 * 3718 * @return bool Whether an element was found. 3719 */ 3720 private function step_in_caption(): bool { 3721 $tag_name = $this->get_tag(); 3722 $op_sigil = $this->is_tag_closer() ? '-' : '+'; 3723 $op = "{$op_sigil}{$tag_name}"; 3724 3725 switch ( $op ) { 3726 /* 3727 * > An end tag whose tag name is "caption" 3728 * > A start tag whose tag name is one of: "caption", "col", "colgroup", "tbody", "td", "tfoot", "th", "thead", "tr" 3729 * > An end tag whose tag name is "table" 3730 * 3731 * These tag handling rules are identical except for the final instruction. 3732 * Handle them in a single block. 3733 */ 3734 case '-CAPTION': 3735 case '+CAPTION': 3736 case '+COL': 3737 case '+COLGROUP': 3738 case '+TBODY': 3739 case '+TD': 3740 case '+TFOOT': 3741 case '+TH': 3742 case '+THEAD': 3743 case '+TR': 3744 case '-TABLE': 3745 if ( ! $this->state->stack_of_open_elements->has_element_in_table_scope( 'CAPTION' ) ) { 3746 // Parse error: ignore the token. 3747 return $this->step(); 3748 } 3749 3750 $this->generate_implied_end_tags(); 3751 if ( ! $this->state->stack_of_open_elements->current_node_is( 'CAPTION' ) ) { 3752 // @todo Indicate a parse error once it's possible. 3753 } 3754 3755 $this->state->stack_of_open_elements->pop_until( 'CAPTION' ); 3756 $this->state->active_formatting_elements->clear_up_to_last_marker(); 3757 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE; 3758 3759 // If this is not a CAPTION end tag, the token should be reprocessed. 3760 if ( '-CAPTION' === $op ) { 3761 return true; 3762 } 3763 return $this->step( self::REPROCESS_CURRENT_NODE ); 3764 3765 /** 3766 * > An end tag whose tag name is one of: "body", "col", "colgroup", "html", "tbody", "td", "tfoot", "th", "thead", "tr" 3767 */ 3768 case '-BODY': 3769 case '-COL': 3770 case '-COLGROUP': 3771 case '-HTML': 3772 case '-TBODY': 3773 case '-TD': 3774 case '-TFOOT': 3775 case '-TH': 3776 case '-THEAD': 3777 case '-TR': 3778 // Parse error: ignore the token. 3779 return $this->step(); 3780 } 3781 3782 /** 3783 * > Anything else 3784 * > Process the token using the rules for the "in body" insertion mode. 3785 */ 3786 return $this->step_in_body(); 3787 } 3788 3789 /** 3790 * Parses next element in the 'in column group' insertion mode. 3791 * 3792 * This internal function performs the 'in column group' insertion mode 3793 * logic for the generalized WP_HTML_Processor::step() function. 3794 * 3795 * @since 6.7.0 3796 * @ignore 3797 * 3798 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. 3799 * 3800 * @see https://html.spec.whatwg.org/#parsing-main-incolgroup 3801 * @see WP_HTML_Processor::step 3802 * 3803 * @return bool Whether an element was found. 3804 */ 3805 private function step_in_column_group(): bool { 3806 $token_name = $this->get_token_name(); 3807 $token_type = $this->get_token_type(); 3808 $op_sigil = '#tag' === $token_type ? ( parent::is_tag_closer() ? '-' : '+' ) : ''; 3809 $op = "{$op_sigil}{$token_name}"; 3810 3811 switch ( $op ) { 3812 /* 3813 * > A character token that is one of U+0009 CHARACTER TABULATION, U+000A LINE FEED (LF), 3814 * > U+000C FORM FEED (FF), U+000D CARRIAGE RETURN (CR), or U+0020 SPACE 3815 */ 3816 case '#text': 3817 if ( parent::TEXT_IS_WHITESPACE === $this->text_node_classification ) { 3818 // Insert the character. 3819 $this->insert_html_element( $this->state->current_token ); 3820 return true; 3821 } 3822 3823 goto in_column_group_anything_else; 3824 break; 3825 3826 /* 3827 * > A comment token 3828 * > A processing instruction token 3829 */ 3830 case '#comment': 3831 case '#funky-comment': 3832 case '#presumptuous-tag': 3833 case '#processing-instruction': 3834 $this->insert_html_element( $this->state->current_token ); 3835 return true; 3836 3837 /* 3838 * > A DOCTYPE token 3839 */ 3840 case 'html': 3841 // @todo Indicate a parse error once it's possible. 3842 return $this->step(); 3843 3844 /* 3845 * > A start tag whose tag name is "html" 3846 */ 3847 case '+HTML': 3848 return $this->step_in_body(); 3849 3850 /* 3851 * > A start tag whose tag name is "col" 3852 */ 3853 case '+COL': 3854 $this->insert_html_element( $this->state->current_token ); 3855 $this->state->stack_of_open_elements->pop(); 3856 return true; 3857 3858 /* 3859 * > An end tag whose tag name is "colgroup" 3860 */ 3861 case '-COLGROUP': 3862 if ( ! $this->state->stack_of_open_elements->current_node_is( 'COLGROUP' ) ) { 3863 // @todo Indicate a parse error once it's possible. 3864 return $this->step(); 3865 } 3866 $this->state->stack_of_open_elements->pop(); 3867 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE; 3868 return true; 3869 3870 /* 3871 * > An end tag whose tag name is "col" 3872 */ 3873 case '-COL': 3874 // Parse error: ignore the token. 3875 return $this->step(); 3876 3877 /* 3878 * > A start tag whose tag name is "template" 3879 * > An end tag whose tag name is "template" 3880 */ 3881 case '+TEMPLATE': 3882 case '-TEMPLATE': 3883 return $this->step_in_head(); 3884 } 3885 3886 in_column_group_anything_else: 3887 /* 3888 * > Anything else 3889 */ 3890 if ( ! $this->state->stack_of_open_elements->current_node_is( 'COLGROUP' ) ) { 3891 // @todo Indicate a parse error once it's possible. 3892 return $this->step(); 3893 } 3894 $this->state->stack_of_open_elements->pop(); 3895 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE; 3896 return $this->step( self::REPROCESS_CURRENT_NODE ); 3897 } 3898 3899 /** 3900 * Parses next element in the 'in table body' insertion mode. 3901 * 3902 * This internal function performs the 'in table body' insertion mode 3903 * logic for the generalized WP_HTML_Processor::step() function. 3904 * 3905 * @since 6.7.0 3906 * @ignore 3907 * 3908 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. 3909 * 3910 * @see https://html.spec.whatwg.org/#parsing-main-intbody 3911 * @see WP_HTML_Processor::step 3912 * 3913 * @return bool Whether an element was found. 3914 */ 3915 private function step_in_table_body(): bool { 3916 $tag_name = $this->get_tag(); 3917 $op_sigil = $this->is_tag_closer() ? '-' : '+'; 3918 $op = "{$op_sigil}{$tag_name}"; 3919 3920 switch ( $op ) { 3921 /* 3922 * > A start tag whose tag name is "tr" 3923 */ 3924 case '+TR': 3925 $this->state->stack_of_open_elements->clear_to_table_body_context(); 3926 $this->insert_html_element( $this->state->current_token ); 3927 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_ROW; 3928 return true; 3929 3930 /* 3931 * > A start tag whose tag name is one of: "th", "td" 3932 */ 3933 case '+TH': 3934 case '+TD': 3935 // @todo Indicate a parse error once it's possible. 3936 $this->state->stack_of_open_elements->clear_to_table_body_context(); 3937 $this->insert_virtual_node( 'TR' ); 3938 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_ROW; 3939 return $this->step( self::REPROCESS_CURRENT_NODE ); 3940 3941 /* 3942 * > An end tag whose tag name is one of: "tbody", "tfoot", "thead" 3943 */ 3944 case '-TBODY': 3945 case '-TFOOT': 3946 case '-THEAD': 3947 if ( ! $this->state->stack_of_open_elements->has_element_in_table_scope( $tag_name ) ) { 3948 // Parse error: ignore the token. 3949 return $this->step(); 3950 } 3951 3952 $this->state->stack_of_open_elements->clear_to_table_body_context(); 3953 $this->state->stack_of_open_elements->pop(); 3954 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE; 3955 return true; 3956 3957 /* 3958 * > A start tag whose tag name is one of: "caption", "col", "colgroup", "tbody", "tfoot", "thead" 3959 * > An end tag whose tag name is "table" 3960 */ 3961 case '+CAPTION': 3962 case '+COL': 3963 case '+COLGROUP': 3964 case '+TBODY': 3965 case '+TFOOT': 3966 case '+THEAD': 3967 case '-TABLE': 3968 if ( 3969 ! $this->state->stack_of_open_elements->has_element_in_table_scope( 'TBODY' ) && 3970 ! $this->state->stack_of_open_elements->has_element_in_table_scope( 'THEAD' ) && 3971 ! $this->state->stack_of_open_elements->has_element_in_table_scope( 'TFOOT' ) 3972 ) { 3973 // Parse error: ignore the token. 3974 return $this->step(); 3975 } 3976 $this->state->stack_of_open_elements->clear_to_table_body_context(); 3977 $this->state->stack_of_open_elements->pop(); 3978 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE; 3979 return $this->step( self::REPROCESS_CURRENT_NODE ); 3980 3981 /* 3982 * > An end tag whose tag name is one of: "body", "caption", "col", "colgroup", "html", "td", "th", "tr" 3983 */ 3984 case '-BODY': 3985 case '-CAPTION': 3986 case '-COL': 3987 case '-COLGROUP': 3988 case '-HTML': 3989 case '-TD': 3990 case '-TH': 3991 case '-TR': 3992 // Parse error: ignore the token. 3993 return $this->step(); 3994 } 3995 3996 /* 3997 * > Anything else 3998 * > Process the token using the rules for the "in table" insertion mode. 3999 */ 4000 return $this->step_in_table(); 4001 } 4002 4003 /** 4004 * Parses next element in the 'in row' insertion mode. 4005 * 4006 * This internal function performs the 'in row' insertion mode 4007 * logic for the generalized WP_HTML_Processor::step() function. 4008 * 4009 * @since 6.7.0 4010 * @ignore 4011 * 4012 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. 4013 * 4014 * @see https://html.spec.whatwg.org/#parsing-main-intr 4015 * @see WP_HTML_Processor::step 4016 * 4017 * @return bool Whether an element was found. 4018 */ 4019 private function step_in_row(): bool { 4020 $tag_name = $this->get_tag(); 4021 $op_sigil = $this->is_tag_closer() ? '-' : '+'; 4022 $op = "{$op_sigil}{$tag_name}"; 4023 4024 switch ( $op ) { 4025 /* 4026 * > A start tag whose tag name is one of: "th", "td" 4027 */ 4028 case '+TH': 4029 case '+TD': 4030 $this->state->stack_of_open_elements->clear_to_table_row_context(); 4031 $this->insert_html_element( $this->state->current_token ); 4032 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_CELL; 4033 $this->state->active_formatting_elements->insert_marker(); 4034 return true; 4035 4036 /* 4037 * > An end tag whose tag name is "tr" 4038 */ 4039 case '-TR': 4040 if ( ! $this->state->stack_of_open_elements->has_element_in_table_scope( 'TR' ) ) { 4041 // Parse error: ignore the token. 4042 return $this->step(); 4043 } 4044 4045 $this->state->stack_of_open_elements->clear_to_table_row_context(); 4046 $this->state->stack_of_open_elements->pop(); 4047 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE_BODY; 4048 return true; 4049 4050 /* 4051 * > A start tag whose tag name is one of: "caption", "col", "colgroup", "tbody", "tfoot", "thead", "tr" 4052 * > An end tag whose tag name is "table" 4053 */ 4054 case '+CAPTION': 4055 case '+COL': 4056 case '+COLGROUP': 4057 case '+TBODY': 4058 case '+TFOOT': 4059 case '+THEAD': 4060 case '+TR': 4061 case '-TABLE': 4062 if ( ! $this->state->stack_of_open_elements->has_element_in_table_scope( 'TR' ) ) { 4063 // Parse error: ignore the token. 4064 return $this->step(); 4065 } 4066 4067 $this->state->stack_of_open_elements->clear_to_table_row_context(); 4068 $this->state->stack_of_open_elements->pop(); 4069 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE_BODY; 4070 return $this->step( self::REPROCESS_CURRENT_NODE ); 4071 4072 /* 4073 * > An end tag whose tag name is one of: "tbody", "tfoot", "thead" 4074 */ 4075 case '-TBODY': 4076 case '-TFOOT': 4077 case '-THEAD': 4078 if ( ! $this->state->stack_of_open_elements->has_element_in_table_scope( $tag_name ) ) { 4079 // Parse error: ignore the token. 4080 return $this->step(); 4081 } 4082 4083 if ( ! $this->state->stack_of_open_elements->has_element_in_table_scope( 'TR' ) ) { 4084 // Ignore the token. 4085 return $this->step(); 4086 } 4087 4088 $this->state->stack_of_open_elements->clear_to_table_row_context(); 4089 $this->state->stack_of_open_elements->pop(); 4090 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE_BODY; 4091 return $this->step( self::REPROCESS_CURRENT_NODE ); 4092 4093 /* 4094 * > An end tag whose tag name is one of: "body", "caption", "col", "colgroup", "html", "td", "th" 4095 */ 4096 case '-BODY': 4097 case '-CAPTION': 4098 case '-COL': 4099 case '-COLGROUP': 4100 case '-HTML': 4101 case '-TD': 4102 case '-TH': 4103 // Parse error: ignore the token. 4104 return $this->step(); 4105 } 4106 4107 /* 4108 * > Anything else 4109 * > Process the token using the rules for the "in table" insertion mode. 4110 */ 4111 return $this->step_in_table(); 4112 } 4113 4114 /** 4115 * Parses next element in the 'in cell' insertion mode. 4116 * 4117 * This internal function performs the 'in cell' insertion mode 4118 * logic for the generalized WP_HTML_Processor::step() function. 4119 * 4120 * @since 6.7.0 4121 * @ignore 4122 * 4123 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. 4124 * 4125 * @see https://html.spec.whatwg.org/#parsing-main-intd 4126 * @see WP_HTML_Processor::step 4127 * 4128 * @return bool Whether an element was found. 4129 */ 4130 private function step_in_cell(): bool { 4131 $tag_name = $this->get_tag(); 4132 $op_sigil = $this->is_tag_closer() ? '-' : '+'; 4133 $op = "{$op_sigil}{$tag_name}"; 4134 4135 switch ( $op ) { 4136 /* 4137 * > An end tag whose tag name is one of: "td", "th" 4138 */ 4139 case '-TD': 4140 case '-TH': 4141 if ( ! $this->state->stack_of_open_elements->has_element_in_table_scope( $tag_name ) ) { 4142 // Parse error: ignore the token. 4143 return $this->step(); 4144 } 4145 4146 $this->generate_implied_end_tags(); 4147 4148 /* 4149 * @todo This needs to check if the current node is an HTML element, meaning that 4150 * when SVG and MathML support is added, this needs to differentiate between an 4151 * HTML element of the given name, such as `<center>`, and a foreign element of 4152 * the same given name. 4153 */ 4154 if ( ! $this->state->stack_of_open_elements->current_node_is( $tag_name ) ) { 4155 // @todo Indicate a parse error once it's possible. 4156 } 4157 4158 $this->state->stack_of_open_elements->pop_until( $tag_name ); 4159 $this->state->active_formatting_elements->clear_up_to_last_marker(); 4160 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_ROW; 4161 return true; 4162 4163 /* 4164 * > A start tag whose tag name is one of: "caption", "col", "colgroup", "tbody", "td", 4165 * > "tfoot", "th", "thead", "tr" 4166 */ 4167 case '+CAPTION': 4168 case '+COL': 4169 case '+COLGROUP': 4170 case '+TBODY': 4171 case '+TD': 4172 case '+TFOOT': 4173 case '+TH': 4174 case '+THEAD': 4175 case '+TR': 4176 /* 4177 * > Assert: The stack of open elements has a td or th element in table scope. 4178 * 4179 * Nothing to do here, except to verify in tests that this never appears. 4180 */ 4181 4182 $this->close_cell(); 4183 return $this->step( self::REPROCESS_CURRENT_NODE ); 4184 4185 /* 4186 * > An end tag whose tag name is one of: "body", "caption", "col", "colgroup", "html" 4187 */ 4188 case '-BODY': 4189 case '-CAPTION': 4190 case '-COL': 4191 case '-COLGROUP': 4192 case '-HTML': 4193 // Parse error: ignore the token. 4194 return $this->step(); 4195 4196 /* 4197 * > An end tag whose tag name is one of: "table", "tbody", "tfoot", "thead", "tr" 4198 */ 4199 case '-TABLE': 4200 case '-TBODY': 4201 case '-TFOOT': 4202 case '-THEAD': 4203 case '-TR': 4204 if ( ! $this->state->stack_of_open_elements->has_element_in_table_scope( $tag_name ) ) { 4205 // Parse error: ignore the token. 4206 return $this->step(); 4207 } 4208 $this->close_cell(); 4209 return $this->step( self::REPROCESS_CURRENT_NODE ); 4210 } 4211 4212 /* 4213 * > Anything else 4214 * > Process the token using the rules for the "in body" insertion mode. 4215 */ 4216 return $this->step_in_body(); 4217 } 4218 4219 /** 4220 * Parses next element in the 'in template' insertion mode. 4221 * 4222 * This internal function performs the 'in template' insertion mode 4223 * logic for the generalized WP_HTML_Processor::step() function. 4224 * 4225 * @since 6.7.0 4226 * @ignore 4227 * 4228 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. 4229 * 4230 * @see https://html.spec.whatwg.org/#parsing-main-intemplate 4231 * @see WP_HTML_Processor::step 4232 * 4233 * @return bool Whether an element was found. 4234 */ 4235 private function step_in_template(): bool { 4236 $token_name = $this->get_token_name(); 4237 $token_type = $this->get_token_type(); 4238 $is_closer = $this->is_tag_closer(); 4239 $op_sigil = '#tag' === $token_type ? ( $is_closer ? '-' : '+' ) : ''; 4240 $op = "{$op_sigil}{$token_name}"; 4241 4242 switch ( $op ) { 4243 /* 4244 * > A character token 4245 * > A comment token 4246 * > A processing instruction token 4247 * > A DOCTYPE token 4248 */ 4249 case '#text': 4250 case '#comment': 4251 case '#funky-comment': 4252 case '#presumptuous-tag': 4253 case '#processing-instruction': 4254 case 'html': 4255 return $this->step_in_body(); 4256 4257 /* 4258 * > A start tag whose tag name is one of: "base", "basefont", "bgsound", "link", 4259 * > "meta", "noframes", "script", "style", "template", "title" 4260 * > An end tag whose tag name is "template" 4261 */ 4262 case '+BASE': 4263 case '+BASEFONT': 4264 case '+BGSOUND': 4265 case '+LINK': 4266 case '+META': 4267 case '+NOFRAMES': 4268 case '+SCRIPT': 4269 case '+STYLE': 4270 case '+TEMPLATE': 4271 case '+TITLE': 4272 case '-TEMPLATE': 4273 return $this->step_in_head(); 4274 4275 /* 4276 * > A start tag whose tag name is one of: "caption", "colgroup", "tbody", "tfoot", "thead" 4277 */ 4278 case '+CAPTION': 4279 case '+COLGROUP': 4280 case '+TBODY': 4281 case '+TFOOT': 4282 case '+THEAD': 4283 array_pop( $this->state->stack_of_template_insertion_modes ); 4284 $this->state->stack_of_template_insertion_modes[] = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE; 4285 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE; 4286 return $this->step( self::REPROCESS_CURRENT_NODE ); 4287 4288 /* 4289 * > A start tag whose tag name is "col" 4290 */ 4291 case '+COL': 4292 array_pop( $this->state->stack_of_template_insertion_modes ); 4293 $this->state->stack_of_template_insertion_modes[] = WP_HTML_Processor_State::INSERTION_MODE_IN_COLUMN_GROUP; 4294 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_COLUMN_GROUP; 4295 return $this->step( self::REPROCESS_CURRENT_NODE ); 4296 4297 /* 4298 * > A start tag whose tag name is "tr" 4299 */ 4300 case '+TR': 4301 array_pop( $this->state->stack_of_template_insertion_modes ); 4302 $this->state->stack_of_template_insertion_modes[] = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE_BODY; 4303 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE_BODY; 4304 return $this->step( self::REPROCESS_CURRENT_NODE ); 4305 4306 /* 4307 * > A start tag whose tag name is one of: "td", "th" 4308 */ 4309 case '+TD': 4310 case '+TH': 4311 array_pop( $this->state->stack_of_template_insertion_modes ); 4312 $this->state->stack_of_template_insertion_modes[] = WP_HTML_Processor_State::INSERTION_MODE_IN_ROW; 4313 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_ROW; 4314 return $this->step( self::REPROCESS_CURRENT_NODE ); 4315 } 4316 4317 /* 4318 * > Any other start tag 4319 */ 4320 if ( ! $is_closer ) { 4321 array_pop( $this->state->stack_of_template_insertion_modes ); 4322 $this->state->stack_of_template_insertion_modes[] = WP_HTML_Processor_State::INSERTION_MODE_IN_BODY; 4323 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_BODY; 4324 return $this->step( self::REPROCESS_CURRENT_NODE ); 4325 } 4326 4327 /* 4328 * > Any other end tag 4329 */ 4330 if ( $is_closer ) { 4331 // Parse error: ignore the token. 4332 return $this->step(); 4333 } 4334 4335 /* 4336 * > An end-of-file token 4337 */ 4338 if ( ! $this->state->stack_of_open_elements->contains( 'TEMPLATE' ) ) { 4339 // Stop parsing. 4340 return false; 4341 } 4342 4343 // @todo Indicate a parse error once it's possible. 4344 $this->state->stack_of_open_elements->pop_until( 'TEMPLATE' ); 4345 $this->state->active_formatting_elements->clear_up_to_last_marker(); 4346 array_pop( $this->state->stack_of_template_insertion_modes ); 4347 $this->reset_insertion_mode_appropriately(); 4348 return $this->step( self::REPROCESS_CURRENT_NODE ); 4349 } 4350 4351 /** 4352 * Parses next element in the 'after body' insertion mode. 4353 * 4354 * This internal function performs the 'after body' insertion mode 4355 * logic for the generalized WP_HTML_Processor::step() function. 4356 * 4357 * @since 6.7.0 4358 * @ignore 4359 * 4360 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. 4361 * 4362 * @see https://html.spec.whatwg.org/#parsing-main-afterbody 4363 * @see WP_HTML_Processor::step 4364 * 4365 * @return bool Whether an element was found. 4366 */ 4367 private function step_after_body(): bool { 4368 $tag_name = $this->get_token_name(); 4369 $token_type = $this->get_token_type(); 4370 $op_sigil = '#tag' === $token_type ? ( $this->is_tag_closer() ? '-' : '+' ) : ''; 4371 $op = "{$op_sigil}{$tag_name}"; 4372 4373 switch ( $op ) { 4374 /* 4375 * > A character token that is one of U+0009 CHARACTER TABULATION, U+000A LINE FEED (LF), 4376 * > U+000C FORM FEED (FF), U+000D CARRIAGE RETURN (CR), or U+0020 SPACE 4377 * 4378 * > Process the token using the rules for the "in body" insertion mode. 4379 */ 4380 case '#text': 4381 if ( parent::TEXT_IS_WHITESPACE === $this->text_node_classification ) { 4382 return $this->step_in_body(); 4383 } 4384 goto after_body_anything_else; 4385 break; 4386 4387 /* 4388 * > A comment token 4389 * > A processing instruction token 4390 */ 4391 case '#comment': 4392 case '#funky-comment': 4393 case '#presumptuous-tag': 4394 case '#processing-instruction': 4395 $this->bail( 'Content outside of BODY is unsupported.' ); 4396 break; 4397 4398 /* 4399 * > A DOCTYPE token 4400 */ 4401 case 'html': 4402 // Parse error: ignore the token. 4403 return $this->step(); 4404 4405 /* 4406 * > A start tag whose tag name is "html" 4407 */ 4408 case '+HTML': 4409 return $this->step_in_body(); 4410 4411 /* 4412 * > An end tag whose tag name is "html" 4413 * 4414 * > If the parser was created as part of the HTML fragment parsing algorithm, 4415 * > this is a parse error; ignore the token. (fragment case) 4416 * > 4417 * > Otherwise, switch the insertion mode to "after after body". 4418 */ 4419 case '-HTML': 4420 if ( isset( $this->context_node ) ) { 4421 return $this->step(); 4422 } 4423 4424 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_AFTER_AFTER_BODY; 4425 /* 4426 * The HTML element is not removed from the stack of open elements. 4427 * Only internal state has changed, this does not qualify as a "step" 4428 * in terms of advancing through the document to another token. 4429 * Nothing has been pushed or popped. 4430 * Proceed to parse the next item. 4431 */ 4432 return $this->step(); 4433 } 4434 4435 /* 4436 * > Parse error. Switch the insertion mode to "in body" and reprocess the token. 4437 */ 4438 after_body_anything_else: 4439 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_BODY; 4440 return $this->step( self::REPROCESS_CURRENT_NODE ); 4441 } 4442 4443 /** 4444 * Parses next element in the 'in frameset' insertion mode. 4445 * 4446 * This internal function performs the 'in frameset' insertion mode 4447 * logic for the generalized WP_HTML_Processor::step() function. 4448 * 4449 * @since 6.7.0 4450 * @ignore 4451 * 4452 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. 4453 * 4454 * @see https://html.spec.whatwg.org/#parsing-main-inframeset 4455 * @see WP_HTML_Processor::step 4456 * 4457 * @return bool Whether an element was found. 4458 */ 4459 private function step_in_frameset(): bool { 4460 $tag_name = $this->get_token_name(); 4461 $token_type = $this->get_token_type(); 4462 $op_sigil = '#tag' === $token_type ? ( $this->is_tag_closer() ? '-' : '+' ) : ''; 4463 $op = "{$op_sigil}{$tag_name}"; 4464 4465 switch ( $op ) { 4466 /* 4467 * > A character token that is one of U+0009 CHARACTER TABULATION, U+000A LINE FEED (LF), 4468 * > U+000C FORM FEED (FF), U+000D CARRIAGE RETURN (CR), or U+0020 SPACE 4469 * > 4470 * > Insert the character. 4471 * 4472 * This algorithm effectively strips non-whitespace characters from text and inserts 4473 * them under HTML. This is not supported at this time. 4474 */ 4475 case '#text': 4476 if ( parent::TEXT_IS_WHITESPACE === $this->text_node_classification ) { 4477 return $this->step_in_body(); 4478 } 4479 $this->bail( 'Non-whitespace characters cannot be handled in frameset.' ); 4480 break; 4481 4482 /* 4483 * > A comment token 4484 * > A processing instruction token 4485 */ 4486 case '#comment': 4487 case '#funky-comment': 4488 case '#presumptuous-tag': 4489 case '#processing-instruction': 4490 $this->insert_html_element( $this->state->current_token ); 4491 return true; 4492 4493 /* 4494 * > A DOCTYPE token 4495 */ 4496 case 'html': 4497 // Parse error: ignore the token. 4498 return $this->step(); 4499 4500 /* 4501 * > A start tag whose tag name is "html" 4502 */ 4503 case '+HTML': 4504 return $this->step_in_body(); 4505 4506 /* 4507 * > A start tag whose tag name is "frameset" 4508 */ 4509 case '+FRAMESET': 4510 $this->insert_html_element( $this->state->current_token ); 4511 return true; 4512 4513 /* 4514 * > An end tag whose tag name is "frameset" 4515 */ 4516 case '-FRAMESET': 4517 /* 4518 * > If the current node is the root html element, then this is a parse error; 4519 * > ignore the token. (fragment case) 4520 */ 4521 if ( $this->state->stack_of_open_elements->current_node_is( 'HTML' ) ) { 4522 return $this->step(); 4523 } 4524 4525 /* 4526 * > Otherwise, pop the current node from the stack of open elements. 4527 */ 4528 $this->state->stack_of_open_elements->pop(); 4529 4530 /* 4531 * > If the parser was not created as part of the HTML fragment parsing algorithm 4532 * > (fragment case), and the current node is no longer a frameset element, then 4533 * > switch the insertion mode to "after frameset". 4534 */ 4535 if ( ! isset( $this->context_node ) && ! $this->state->stack_of_open_elements->current_node_is( 'FRAMESET' ) ) { 4536 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_AFTER_FRAMESET; 4537 } 4538 4539 return true; 4540 4541 /* 4542 * > A start tag whose tag name is "frame" 4543 * 4544 * > Insert an HTML element for the token. Immediately pop the 4545 * > current node off the stack of open elements. 4546 * > 4547 * > Acknowledge the token's self-closing flag, if it is set. 4548 */ 4549 case '+FRAME': 4550 $this->insert_html_element( $this->state->current_token ); 4551 $this->state->stack_of_open_elements->pop(); 4552 return true; 4553 4554 /* 4555 * > A start tag whose tag name is "noframes" 4556 */ 4557 case '+NOFRAMES': 4558 return $this->step_in_head(); 4559 } 4560 4561 // Parse error: ignore the token. 4562 return $this->step(); 4563 } 4564 4565 /** 4566 * Parses next element in the 'after frameset' insertion mode. 4567 * 4568 * This internal function performs the 'after frameset' insertion mode 4569 * logic for the generalized WP_HTML_Processor::step() function. 4570 * 4571 * @since 6.7.0 4572 * @ignore 4573 * 4574 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. 4575 * 4576 * @see https://html.spec.whatwg.org/#parsing-main-afterframeset 4577 * @see WP_HTML_Processor::step 4578 * 4579 * @return bool Whether an element was found. 4580 */ 4581 private function step_after_frameset(): bool { 4582 $tag_name = $this->get_token_name(); 4583 $token_type = $this->get_token_type(); 4584 $op_sigil = '#tag' === $token_type ? ( $this->is_tag_closer() ? '-' : '+' ) : ''; 4585 $op = "{$op_sigil}{$tag_name}"; 4586 4587 switch ( $op ) { 4588 /* 4589 * > A character token that is one of U+0009 CHARACTER TABULATION, U+000A LINE FEED (LF), 4590 * > U+000C FORM FEED (FF), U+000D CARRIAGE RETURN (CR), or U+0020 SPACE 4591 * > 4592 * > Insert the character. 4593 * 4594 * This algorithm effectively strips non-whitespace characters from text and inserts 4595 * them under HTML. This is not supported at this time. 4596 */ 4597 case '#text': 4598 if ( parent::TEXT_IS_WHITESPACE === $this->text_node_classification ) { 4599 return $this->step_in_body(); 4600 } 4601 $this->bail( 'Non-whitespace characters cannot be handled in after frameset' ); 4602 break; 4603 4604 /* 4605 * > A comment token 4606 * > A processing instruction token 4607 */ 4608 case '#comment': 4609 case '#funky-comment': 4610 case '#presumptuous-tag': 4611 case '#processing-instruction': 4612 $this->insert_html_element( $this->state->current_token ); 4613 return true; 4614 4615 /* 4616 * > A DOCTYPE token 4617 */ 4618 case 'html': 4619 // Parse error: ignore the token. 4620 return $this->step(); 4621 4622 /* 4623 * > A start tag whose tag name is "html" 4624 */ 4625 case '+HTML': 4626 return $this->step_in_body(); 4627 4628 /* 4629 * > An end tag whose tag name is "html" 4630 */ 4631 case '-HTML': 4632 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_AFTER_AFTER_FRAMESET; 4633 /* 4634 * The HTML element is not removed from the stack of open elements. 4635 * Only internal state has changed, this does not qualify as a "step" 4636 * in terms of advancing through the document to another token. 4637 * Nothing has been pushed or popped. 4638 * Proceed to parse the next item. 4639 */ 4640 return $this->step(); 4641 4642 /* 4643 * > A start tag whose tag name is "noframes" 4644 */ 4645 case '+NOFRAMES': 4646 return $this->step_in_head(); 4647 } 4648 4649 // Parse error: ignore the token. 4650 return $this->step(); 4651 } 4652 4653 /** 4654 * Parses next element in the 'after after body' insertion mode. 4655 * 4656 * This internal function performs the 'after after body' insertion mode 4657 * logic for the generalized WP_HTML_Processor::step() function. 4658 * 4659 * @since 6.7.0 4660 * @ignore 4661 * 4662 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. 4663 * 4664 * @see https://html.spec.whatwg.org/#the-after-after-body-insertion-mode 4665 * @see WP_HTML_Processor::step 4666 * 4667 * @return bool Whether an element was found. 4668 */ 4669 private function step_after_after_body(): bool { 4670 $tag_name = $this->get_token_name(); 4671 $token_type = $this->get_token_type(); 4672 $op_sigil = '#tag' === $token_type ? ( $this->is_tag_closer() ? '-' : '+' ) : ''; 4673 $op = "{$op_sigil}{$tag_name}"; 4674 4675 switch ( $op ) { 4676 /* 4677 * > A comment token 4678 * > A processing instruction token 4679 */ 4680 case '#comment': 4681 case '#funky-comment': 4682 case '#presumptuous-tag': 4683 case '#processing-instruction': 4684 $this->bail( 'Content outside of HTML is unsupported.' ); 4685 break; 4686 4687 /* 4688 * > A DOCTYPE token 4689 * > A start tag whose tag name is "html" 4690 * 4691 * > Process the token using the rules for the "in body" insertion mode. 4692 */ 4693 case 'html': 4694 case '+HTML': 4695 return $this->step_in_body(); 4696 4697 /* 4698 * > A character token that is one of U+0009 CHARACTER TABULATION, U+000A LINE FEED (LF), 4699 * > U+000C FORM FEED (FF), U+000D CARRIAGE RETURN (CR), or U+0020 SPACE 4700 * > 4701 * > Process the token using the rules for the "in body" insertion mode. 4702 */ 4703 case '#text': 4704 if ( parent::TEXT_IS_WHITESPACE === $this->text_node_classification ) { 4705 return $this->step_in_body(); 4706 } 4707 goto after_after_body_anything_else; 4708 break; 4709 } 4710 4711 /* 4712 * > Parse error. Switch the insertion mode to "in body" and reprocess the token. 4713 */ 4714 after_after_body_anything_else: 4715 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_BODY; 4716 return $this->step( self::REPROCESS_CURRENT_NODE ); 4717 } 4718 4719 /** 4720 * Parses next element in the 'after after frameset' insertion mode. 4721 * 4722 * This internal function performs the 'after after frameset' insertion mode 4723 * logic for the generalized WP_HTML_Processor::step() function. 4724 * 4725 * @since 6.7.0 4726 * @ignore 4727 * 4728 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. 4729 * 4730 * @see https://html.spec.whatwg.org/#the-after-after-frameset-insertion-mode 4731 * @see WP_HTML_Processor::step 4732 * 4733 * @return bool Whether an element was found. 4734 */ 4735 private function step_after_after_frameset(): bool { 4736 $tag_name = $this->get_token_name(); 4737 $token_type = $this->get_token_type(); 4738 $op_sigil = '#tag' === $token_type ? ( $this->is_tag_closer() ? '-' : '+' ) : ''; 4739 $op = "{$op_sigil}{$tag_name}"; 4740 4741 switch ( $op ) { 4742 /* 4743 * > A comment token 4744 * > A processing instruction token 4745 */ 4746 case '#comment': 4747 case '#funky-comment': 4748 case '#presumptuous-tag': 4749 case '#processing-instruction': 4750 $this->bail( 'Content outside of HTML is unsupported.' ); 4751 break; 4752 4753 /* 4754 * > A DOCTYPE token 4755 * > A start tag whose tag name is "html" 4756 * 4757 * > Process the token using the rules for the "in body" insertion mode. 4758 */ 4759 case 'html': 4760 case '+HTML': 4761 return $this->step_in_body(); 4762 4763 /* 4764 * > A character token that is one of U+0009 CHARACTER TABULATION, U+000A LINE FEED (LF), 4765 * > U+000C FORM FEED (FF), U+000D CARRIAGE RETURN (CR), or U+0020 SPACE 4766 * > 4767 * > Process the token using the rules for the "in body" insertion mode. 4768 * 4769 * This algorithm effectively strips non-whitespace characters from text and inserts 4770 * them under HTML. This is not supported at this time. 4771 */ 4772 case '#text': 4773 if ( parent::TEXT_IS_WHITESPACE === $this->text_node_classification ) { 4774 return $this->step_in_body(); 4775 } 4776 $this->bail( 'Non-whitespace characters cannot be handled in after after frameset.' ); 4777 break; 4778 4779 /* 4780 * > A start tag whose tag name is "noframes" 4781 */ 4782 case '+NOFRAMES': 4783 return $this->step_in_head(); 4784 } 4785 4786 // Parse error: ignore the token. 4787 return $this->step(); 4788 } 4789 4790 /** 4791 * Parses next element in the 'in foreign content' insertion mode. 4792 * 4793 * This internal function performs the 'in foreign content' insertion mode 4794 * logic for the generalized WP_HTML_Processor::step() function. 4795 * 4796 * @since 6.7.0 4797 * @ignore 4798 * 4799 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. 4800 * 4801 * @see https://html.spec.whatwg.org/#parsing-main-inforeign 4802 * @see WP_HTML_Processor::step 4803 * 4804 * @return bool Whether an element was found. 4805 */ 4806 private function step_in_foreign_content(): bool { 4807 $tag_name = $this->get_token_name(); 4808 $token_type = $this->get_token_type(); 4809 $op_sigil = '#tag' === $token_type ? ( $this->is_tag_closer() ? '-' : '+' ) : ''; 4810 $op = "{$op_sigil}{$tag_name}"; 4811 4812 /* 4813 * > A start tag whose name is "font", if the token has any attributes named "color", "face", or "size" 4814 * 4815 * This section drawn out above the switch to more easily incorporate 4816 * the additional rules based on the presence of the attributes. 4817 */ 4818 if ( 4819 '+FONT' === $op && 4820 ( 4821 null !== $this->get_attribute( 'color' ) || 4822 null !== $this->get_attribute( 'face' ) || 4823 null !== $this->get_attribute( 'size' ) 4824 ) 4825 ) { 4826 $op = '+FONT with attributes'; 4827 } 4828 4829 switch ( $op ) { 4830 case '#text': 4831 /* 4832 * > A character token that is U+0000 NULL 4833 * 4834 * This is handled by `get_modifiable_text()`. 4835 */ 4836 4837 /* 4838 * Whitespace-only text does not affect the frameset-ok flag. 4839 * It is probably inter-element whitespace, but it may also 4840 * contain character references which decode only to whitespace. 4841 */ 4842 if ( parent::TEXT_IS_GENERIC === $this->text_node_classification ) { 4843 $this->state->frameset_ok = false; 4844 } 4845 4846 $this->insert_foreign_element( $this->state->current_token, false ); 4847 return true; 4848 4849 /* 4850 * CDATA sections are alternate wrappers for text content and therefore 4851 * ought to follow the same rules as text nodes. 4852 */ 4853 case '#cdata-section': 4854 /* 4855 * NULL bytes and whitespace do not change the frameset-ok flag. 4856 */ 4857 $current_token = $this->bookmarks[ $this->state->current_token->bookmark_name ]; 4858 $cdata_content_start = $current_token->start + 9; 4859 $cdata_content_length = $current_token->length - 12; 4860 if ( strspn( $this->html, "\0 \t\n\f\r", $cdata_content_start, $cdata_content_length ) !== $cdata_content_length ) { 4861 $this->state->frameset_ok = false; 4862 } 4863 4864 $this->insert_foreign_element( $this->state->current_token, false ); 4865 return true; 4866 4867 /* 4868 * > A comment token 4869 * > A processing instruction token 4870 */ 4871 case '#comment': 4872 case '#funky-comment': 4873 case '#presumptuous-tag': 4874 case '#processing-instruction': 4875 $this->insert_foreign_element( $this->state->current_token, false ); 4876 return true; 4877 4878 /* 4879 * > A DOCTYPE token 4880 */ 4881 case 'html': 4882 // Parse error: ignore the token. 4883 return $this->step(); 4884 4885 /* 4886 * > A start tag whose tag name is "b", "big", "blockquote", "body", "br", "center", 4887 * > "code", "dd", "div", "dl", "dt", "em", "embed", "h1", "h2", "h3", "h4", "h5", 4888 * > "h6", "head", "hr", "i", "img", "li", "listing", "menu", "meta", "nobr", "ol", 4889 * > "p", "pre", "ruby", "s", "small", "span", "strong", "strike", "sub", "sup", 4890 * > "table", "tt", "u", "ul", "var" 4891 * 4892 * > A start tag whose name is "font", if the token has any attributes named "color", "face", or "size" 4893 * 4894 * > An end tag whose tag name is "br", "p" 4895 * 4896 * Closing BR tags are always reported by the Tag Processor as opening tags. 4897 */ 4898 case '+B': 4899 case '+BIG': 4900 case '+BLOCKQUOTE': 4901 case '+BODY': 4902 case '+BR': 4903 case '+CENTER': 4904 case '+CODE': 4905 case '+DD': 4906 case '+DIV': 4907 case '+DL': 4908 case '+DT': 4909 case '+EM': 4910 case '+EMBED': 4911 case '+H1': 4912 case '+H2': 4913 case '+H3': 4914 case '+H4': 4915 case '+H5': 4916 case '+H6': 4917 case '+HEAD': 4918 case '+HR': 4919 case '+I': 4920 case '+IMG': 4921 case '+LI': 4922 case '+LISTING': 4923 case '+MENU': 4924 case '+META': 4925 case '+NOBR': 4926 case '+OL': 4927 case '+P': 4928 case '+PRE': 4929 case '+RUBY': 4930 case '+S': 4931 case '+SMALL': 4932 case '+SPAN': 4933 case '+STRONG': 4934 case '+STRIKE': 4935 case '+SUB': 4936 case '+SUP': 4937 case '+TABLE': 4938 case '+TT': 4939 case '+U': 4940 case '+UL': 4941 case '+VAR': 4942 case '+FONT with attributes': 4943 case '-BR': 4944 case '-P': 4945 // @todo Indicate a parse error once it's possible. 4946 foreach ( $this->state->stack_of_open_elements->walk_up() as $current_node ) { 4947 if ( 4948 'math' === $current_node->integration_node_type || 4949 'html' === $current_node->integration_node_type || 4950 'html' === $current_node->namespace 4951 ) { 4952 break; 4953 } 4954 4955 $this->state->stack_of_open_elements->pop(); 4956 } 4957 goto in_foreign_content_process_in_current_insertion_mode; 4958 } 4959 4960 /* 4961 * > Any other start tag 4962 */ 4963 if ( ! $this->is_tag_closer() ) { 4964 $this->insert_foreign_element( $this->state->current_token, false ); 4965 4966 /* 4967 * > If the token has its self-closing flag set, then run 4968 * > the appropriate steps from the following list: 4969 * > 4970 * > ↪ the token's tag name is "script", and the new current node is in the SVG namespace 4971 * > Acknowledge the token's self-closing flag, and then act as 4972 * > described in the steps for a "script" end tag below. 4973 * > 4974 * > ↪ Otherwise 4975 * > Pop the current node off the stack of open elements and 4976 * > acknowledge the token's self-closing flag. 4977 * 4978 * Since the rules for SCRIPT below indicate to pop the element off of the stack of 4979 * open elements, which is the same for the Otherwise condition, there's no need to 4980 * separate these checks. The difference comes when a parser operates with the scripting 4981 * flag enabled, and executes the script, which this parser does not support. 4982 */ 4983 if ( $this->state->current_token->has_self_closing_flag ) { 4984 $this->state->stack_of_open_elements->pop(); 4985 } 4986 return true; 4987 } 4988 4989 /* 4990 * > An end tag whose name is "script", if the current node is an SVG script element. 4991 */ 4992 if ( $this->is_tag_closer() && 'SCRIPT' === $this->state->current_token->node_name && 'svg' === $this->state->current_token->namespace ) { 4993 $this->state->stack_of_open_elements->pop(); 4994 return true; 4995 } 4996 4997 /* 4998 * > Any other end tag 4999 */ 5000 if ( $this->is_tag_closer() ) { 5001 $node = $this->state->stack_of_open_elements->current_node(); 5002 if ( $tag_name !== $node->node_name ) { 5003 // @todo Indicate a parse error once it's possible. 5004 } 5005 in_foreign_content_end_tag_loop: 5006 if ( $node === $this->state->stack_of_open_elements->at( 1 ) ) { 5007 return true; 5008 } 5009 5010 /* 5011 * > If node's tag name, converted to ASCII lowercase, is the same as the tag name 5012 * > of the token, pop elements from the stack of open elements until node has 5013 * > been popped from the stack, and then return. 5014 */ 5015 if ( 0 === strcasecmp( $node->node_name, $tag_name ) ) { 5016 foreach ( $this->state->stack_of_open_elements->walk_up() as $item ) { 5017 $this->state->stack_of_open_elements->pop(); 5018 if ( $node === $item ) { 5019 return true; 5020 } 5021 } 5022 } 5023 5024 foreach ( $this->state->stack_of_open_elements->walk_up( $node ) as $item ) { 5025 $node = $item; 5026 break; 5027 } 5028 5029 if ( 'html' !== $node->namespace ) { 5030 goto in_foreign_content_end_tag_loop; 5031 } 5032 5033 in_foreign_content_process_in_current_insertion_mode: 5034 switch ( $this->state->insertion_mode ) { 5035 case WP_HTML_Processor_State::INSERTION_MODE_INITIAL: 5036 return $this->step_initial(); 5037 5038 case WP_HTML_Processor_State::INSERTION_MODE_BEFORE_HTML: 5039 return $this->step_before_html(); 5040 5041 case WP_HTML_Processor_State::INSERTION_MODE_BEFORE_HEAD: 5042 return $this->step_before_head(); 5043 5044 case WP_HTML_Processor_State::INSERTION_MODE_IN_HEAD: 5045 return $this->step_in_head(); 5046 5047 case WP_HTML_Processor_State::INSERTION_MODE_IN_HEAD_NOSCRIPT: 5048 return $this->step_in_head_noscript(); 5049 5050 case WP_HTML_Processor_State::INSERTION_MODE_AFTER_HEAD: 5051 return $this->step_after_head(); 5052 5053 case WP_HTML_Processor_State::INSERTION_MODE_IN_BODY: 5054 return $this->step_in_body(); 5055 5056 case WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE: 5057 return $this->step_in_table(); 5058 5059 case WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE_TEXT: 5060 return $this->step_in_table_text(); 5061 5062 case WP_HTML_Processor_State::INSERTION_MODE_IN_CAPTION: 5063 return $this->step_in_caption(); 5064 5065 case WP_HTML_Processor_State::INSERTION_MODE_IN_COLUMN_GROUP: 5066 return $this->step_in_column_group(); 5067 5068 case WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE_BODY: 5069 return $this->step_in_table_body(); 5070 5071 case WP_HTML_Processor_State::INSERTION_MODE_IN_ROW: 5072 return $this->step_in_row(); 5073 5074 case WP_HTML_Processor_State::INSERTION_MODE_IN_CELL: 5075 return $this->step_in_cell(); 5076 5077 case WP_HTML_Processor_State::INSERTION_MODE_IN_TEMPLATE: 5078 return $this->step_in_template(); 5079 5080 case WP_HTML_Processor_State::INSERTION_MODE_AFTER_BODY: 5081 return $this->step_after_body(); 5082 5083 case WP_HTML_Processor_State::INSERTION_MODE_IN_FRAMESET: 5084 return $this->step_in_frameset(); 5085 5086 case WP_HTML_Processor_State::INSERTION_MODE_AFTER_FRAMESET: 5087 return $this->step_after_frameset(); 5088 5089 case WP_HTML_Processor_State::INSERTION_MODE_AFTER_AFTER_BODY: 5090 return $this->step_after_after_body(); 5091 5092 case WP_HTML_Processor_State::INSERTION_MODE_AFTER_AFTER_FRAMESET: 5093 return $this->step_after_after_frameset(); 5094 5095 // This should be unreachable but PHP doesn't have total type checking on switch. 5096 default: 5097 $this->bail( "Unaware of the requested parsing mode: '{$this->state->insertion_mode}'." ); 5098 } 5099 } 5100 5101 $this->bail( 'Should not have been able to reach end of IN FOREIGN CONTENT processing. Check HTML API code.' ); 5102 // This unnecessary return prevents tools from inaccurately reporting type errors. 5103 return false; 5104 } 5105 5106 /* 5107 * Internal helpers 5108 */ 5109 5110 /** 5111 * Creates a new bookmark for the currently-matched token and returns the generated name. 5112 * 5113 * @since 6.4.0 5114 * @since 6.5.0 Renamed from bookmark_tag() to bookmark_token(). 5115 * @ignore 5116 * 5117 * @throws Exception When unable to allocate requested bookmark. 5118 * 5119 * @return string Name of created bookmark. 5120 */ 5121 private function bookmark_token() { 5122 if ( ! parent::set_bookmark( ++$this->bookmark_counter ) ) { 5123 $this->last_error = self::ERROR_EXCEEDED_MAX_BOOKMARKS; 5124 throw new Exception( 'could not allocate bookmark' ); 5125 } 5126 5127 return "{$this->bookmark_counter}"; 5128 } 5129 5130 /* 5131 * HTML semantic overrides for Tag Processor 5132 */ 5133 5134 /** 5135 * Indicates the namespace of the current token, or "html" if there is none. 5136 * 5137 * @return string One of "html", "math", or "svg". 5138 */ 5139 public function get_namespace(): string { 5140 if ( ! isset( $this->current_element ) ) { 5141 return parent::get_namespace(); 5142 } 5143 5144 return $this->current_element->token->namespace; 5145 } 5146 5147 /** 5148 * Returns the uppercase name of the matched tag. 5149 * 5150 * The semantic rules for HTML specify that certain tags be reprocessed 5151 * with a different tag name. Because of this, the tag name presented 5152 * by the HTML Processor may differ from the one reported by the HTML 5153 * Tag Processor, which doesn't apply these semantic rules. 5154 * 5155 * Example: 5156 * 5157 * $processor = new WP_HTML_Tag_Processor( '<div class="test">Test</div>' ); 5158 * $processor->next_tag() === true; 5159 * $processor->get_tag() === 'DIV'; 5160 * 5161 * $processor->next_tag() === false; 5162 * $processor->get_tag() === null; 5163 * 5164 * @since 6.4.0 5165 * 5166 * @return string|null Name of currently matched tag in input HTML, or `null` if none found. 5167 */ 5168 public function get_tag(): ?string { 5169 if ( null !== $this->last_error ) { 5170 return null; 5171 } 5172 5173 if ( $this->is_virtual() ) { 5174 return $this->current_element->token->node_name; 5175 } 5176 5177 $tag_name = parent::get_tag(); 5178 5179 /* 5180 * > A start tag whose tag name is "image" 5181 * > Change the token's tag name to "img" and reprocess it. (Don't ask.) 5182 * 5183 * This only applies to tags; a processing instruction target or a 5184 * comment which looks like a processing instruction may also report 5185 * a tag name and must not be rewritten. 5186 */ 5187 return ( 'IMAGE' === $tag_name && 'html' === $this->get_namespace() && '#tag' === $this->get_token_type() ) 5188 ? 'IMG' 5189 : $tag_name; 5190 } 5191 5192 /** 5193 * Indicates if the currently matched tag contains the self-closing flag. 5194 * 5195 * No HTML elements ought to have the self-closing flag and for those, the self-closing 5196 * flag will be ignored. For void elements this is benign because they "self close" 5197 * automatically. For non-void HTML elements though problems will appear if someone 5198 * intends to use a self-closing element in place of that element with an empty body. 5199 * For HTML foreign elements and custom elements the self-closing flag determines if 5200 * they self-close or not. 5201 * 5202 * This function does not determine if a tag is self-closing, 5203 * but only if the self-closing flag is present in the syntax. 5204 * 5205 * @since 6.6.0 Subclassed for the HTML Processor. 5206 * 5207 * @return bool Whether the currently matched tag contains the self-closing flag. 5208 */ 5209 public function has_self_closing_flag(): bool { 5210 return $this->is_virtual() ? false : parent::has_self_closing_flag(); 5211 } 5212 5213 /** 5214 * Returns the node name represented by the token. 5215 * 5216 * This matches the DOM API value `nodeName`. Some values 5217 * are static, such as `#text` for a text node, while others 5218 * are dynamically generated from the token itself. 5219 * 5220 * Dynamic names: 5221 * - Uppercase tag name for tag matches. 5222 * - `html` for DOCTYPE declarations. 5223 * 5224 * Note that if the Tag Processor is not matched on a token 5225 * then this function will return `null`, either because it 5226 * hasn't yet found a token or because it reached the end 5227 * of the document without matching a token. 5228 * 5229 * @since 6.6.0 Subclassed for the HTML Processor. 5230 * 5231 * @return string|null Name of the matched token. 5232 */ 5233 public function get_token_name(): ?string { 5234 return $this->is_virtual() 5235 ? $this->current_element->token->node_name 5236 : parent::get_token_name(); 5237 } 5238 5239 /** 5240 * Indicates the kind of matched token, if any. 5241 * 5242 * This differs from `get_token_name()` in that it always 5243 * returns a static string indicating the type, whereas 5244 * `get_token_name()` may return values derived from the 5245 * token itself, such as a tag name or processing 5246 * instruction tag. 5247 * 5248 * Possible values: 5249 * - `#tag` when matched on a tag. 5250 * - `#text` when matched on a text node. 5251 * - `#cdata-section` when matched on a CDATA node. 5252 * - `#comment` when matched on a comment. 5253 * - `#doctype` when matched on a DOCTYPE declaration. 5254 * - `#presumptuous-tag` when matched on an empty tag closer. 5255 * - `#funky-comment` when matched on a funky comment. 5256 * - `#processing-instruction` when matched on a processing instruction. 5257 * 5258 * @since 6.6.0 Subclassed for the HTML Processor. 5259 * @since 7.1.0 Recognize processing instructions according to an HTML 5260 * specification update. 5261 * 5262 * @return string|null What kind of token is matched, or null. 5263 */ 5264 public function get_token_type(): ?string { 5265 if ( $this->is_virtual() ) { 5266 /* 5267 * This logic comes from the Tag Processor. 5268 * 5269 * @todo It would be ideal not to repeat this here, but it's not clearly 5270 * better to allow passing a token name to `get_token_type()`. 5271 */ 5272 $node_name = $this->current_element->token->node_name; 5273 $starting_char = $node_name[0]; 5274 if ( 'A' <= $starting_char && 'Z' >= $starting_char ) { 5275 return '#tag'; 5276 } 5277 5278 if ( 'html' === $node_name ) { 5279 return '#doctype'; 5280 } 5281 5282 return $node_name; 5283 } 5284 5285 return parent::get_token_type(); 5286 } 5287 5288 /** 5289 * Returns the value of a requested attribute from a matched tag opener if that attribute exists. 5290 * 5291 * Example: 5292 * 5293 * $p = WP_HTML_Processor::create_fragment( '<div enabled class="test" data-test-id="14">Test</div>' ); 5294 * $p->next_token() === true; 5295 * $p->get_attribute( 'data-test-id' ) === '14'; 5296 * $p->get_attribute( 'enabled' ) === true; 5297 * $p->get_attribute( 'aria-label' ) === null; 5298 * 5299 * $p->next_tag() === false; 5300 * $p->get_attribute( 'class' ) === null; 5301 * 5302 * @since 6.6.0 Subclassed for HTML Processor. 5303 * 5304 * @param string $name Name of attribute whose value is requested. 5305 * @return string|true|null Value of attribute or `null` if not available. Boolean attributes return `true`. 5306 */ 5307 public function get_attribute( $name ) { 5308 return $this->is_virtual() ? null : parent::get_attribute( $name ); 5309 } 5310 5311 /** 5312 * Updates or creates a new attribute on the currently matched tag with the passed value. 5313 * 5314 * This function handles all necessary HTML encoding. Provide normal, unescaped string values. 5315 * The HTML API will encode the strings appropriately so that the browser will interpret them 5316 * as the intended value. 5317 * 5318 * Example: 5319 * 5320 * // Renders “Eggs & Milk” in a browser, encoded as `<abbr title="Eggs & Milk">`. 5321 * $processor->set_attribute( 'title', 'Eggs & Milk' ); 5322 * 5323 * // Renders “Eggs & Milk” in a browser, encoded as `<abbr title="Eggs &amp; Milk">`. 5324 * $processor->set_attribute( 'title', 'Eggs & Milk' ); 5325 * 5326 * // Renders `true` as `<abbr title>`. 5327 * $processor->set_attribute( 'title', true ); 5328 * 5329 * // Renders without the attribute for `false` as `<abbr>`. 5330 * $processor->set_attribute( 'title', false ); 5331 * 5332 * Special handling is provided for boolean attribute values: 5333 * - When `true` is passed as the value, then only the attribute name is added to the tag. 5334 * - When `false` is passed, the attribute gets removed if it existed before. 5335 * 5336 * @since 6.6.0 Subclassed for the HTML Processor. 5337 * @since 6.9.0 Escapes all character references instead of trying to avoid double-escaping. 5338 * 5339 * @param string $name The attribute name to target. 5340 * @param string|bool $value The new attribute value. 5341 * @return bool Whether an attribute value was set. 5342 */ 5343 public function set_attribute( $name, $value ): bool { 5344 return $this->is_virtual() ? false : parent::set_attribute( $name, $value ); 5345 } 5346 5347 /** 5348 * Remove an attribute from the currently-matched tag. 5349 * 5350 * @since 6.6.0 Subclassed for HTML Processor. 5351 * 5352 * @param string $name The attribute name to remove. 5353 * @return bool Whether an attribute was removed. 5354 */ 5355 public function remove_attribute( $name ): bool { 5356 return $this->is_virtual() ? false : parent::remove_attribute( $name ); 5357 } 5358 5359 /** 5360 * Gets lowercase names of all attributes matching a given prefix in the current tag. 5361 * 5362 * Note that matching is case-insensitive. This is in accordance with the spec: 5363 * 5364 * > There must never be two or more attributes on 5365 * > the same start tag whose names are an ASCII 5366 * > case-insensitive match for each other. 5367 * - HTML 5 spec 5368 * 5369 * Example: 5370 * 5371 * $p = new WP_HTML_Tag_Processor( '<div data-ENABLED class="test" DATA-test-id="14">Test</div>' ); 5372 * $p->next_tag( array( 'class_name' => 'test' ) ) === true; 5373 * $p->get_attribute_names_with_prefix( 'data-' ) === array( 'data-enabled', 'data-test-id' ); 5374 * 5375 * $p->next_tag() === false; 5376 * $p->get_attribute_names_with_prefix( 'data-' ) === null; 5377 * 5378 * @since 6.6.0 Subclassed for the HTML Processor. 5379 * 5380 * @see https://html.spec.whatwg.org/multipage/syntax.html#attributes-2:ascii-case-insensitive 5381 * 5382 * @param string $prefix Prefix of requested attribute names. 5383 * @return array|null List of attribute names, or `null` when no tag opener is matched. 5384 */ 5385 public function get_attribute_names_with_prefix( $prefix ): ?array { 5386 return $this->is_virtual() ? null : parent::get_attribute_names_with_prefix( $prefix ); 5387 } 5388 5389 /** 5390 * Adds a new class name to the currently matched tag. 5391 * 5392 * @since 6.6.0 Subclassed for the HTML Processor. 5393 * 5394 * @param string $class_name The class name to add. 5395 * @return bool Whether the class was set to be added. 5396 */ 5397 public function add_class( $class_name ): bool { 5398 return $this->is_virtual() ? false : parent::add_class( $class_name ); 5399 } 5400 5401 /** 5402 * Removes a class name from the currently matched tag. 5403 * 5404 * @since 6.6.0 Subclassed for the HTML Processor. 5405 * 5406 * @param string $class_name The class name to remove. 5407 * @return bool Whether the class was set to be removed. 5408 */ 5409 public function remove_class( $class_name ): bool { 5410 return $this->is_virtual() ? false : parent::remove_class( $class_name ); 5411 } 5412 5413 /** 5414 * Returns if a matched tag contains the given ASCII case-insensitive class name. 5415 * 5416 * @since 6.6.0 Subclassed for the HTML Processor. 5417 * 5418 * @todo When reconstructing active formatting elements with attributes, find a way 5419 * to indicate if the virtually-reconstructed formatting elements contain the 5420 * wanted class name. 5421 * 5422 * @param string $wanted_class Look for this CSS class name, ASCII case-insensitive. 5423 * @return bool|null Whether the matched tag contains the given class name, or null if not matched. 5424 */ 5425 public function has_class( $wanted_class ): ?bool { 5426 return $this->is_virtual() ? null : parent::has_class( $wanted_class ); 5427 } 5428 5429 /** 5430 * Generator for a foreach loop to step through each class name for the matched tag. 5431 * 5432 * This generator function is designed to be used inside a "foreach" loop. 5433 * 5434 * Example: 5435 * 5436 * $p = WP_HTML_Processor::create_fragment( "<div class='free <egg<\tlang-en'>" ); 5437 * $p->next_tag(); 5438 * foreach ( $p->class_list() as $class_name ) { 5439 * echo "{$class_name} "; 5440 * } 5441 * // Outputs: "free <egg> lang-en " 5442 * 5443 * @since 6.6.0 Subclassed for the HTML Processor. 5444 */ 5445 public function class_list() { 5446 return $this->is_virtual() ? null : parent::class_list(); 5447 } 5448 5449 /** 5450 * Returns the modifiable text for a matched token, or an empty string. 5451 * 5452 * Modifiable text is text content that may be read and changed without 5453 * changing the HTML structure of the document around it. This includes 5454 * the contents of `#text` nodes in the HTML as well as the inner 5455 * contents of HTML comments, Processing Instructions, and others, even 5456 * though these nodes aren't part of a parsed DOM tree. They also contain 5457 * the contents of SCRIPT and STYLE tags, of TEXTAREA tags, and of any 5458 * other section in an HTML document which cannot contain HTML markup (DATA). 5459 * 5460 * If a token has no modifiable text then an empty string is returned to 5461 * avoid needless crashing or type errors. An empty string does not mean 5462 * that a token has modifiable text, and a token with modifiable text may 5463 * have an empty string (e.g. a comment with no contents). 5464 * 5465 * @since 6.6.0 Subclassed for the HTML Processor. 5466 * 5467 * @return string 5468 */ 5469 public function get_modifiable_text(): string { 5470 return $this->is_virtual() ? '' : parent::get_modifiable_text(); 5471 } 5472 5473 /** 5474 * Indicates what kind of comment produced the comment node. 5475 * 5476 * Because there are different kinds of HTML syntax which produce 5477 * comments, the Tag Processor tracks and exposes this as a type 5478 * for the comment. Nominally only regular HTML comments exist as 5479 * they are commonly known, but a number of unrelated syntax errors 5480 * also produce comments. 5481 * 5482 * @see self::COMMENT_AS_ABRUPTLY_CLOSED_COMMENT 5483 * @see self::COMMENT_AS_CDATA_LOOKALIKE 5484 * @see self::COMMENT_AS_INVALID_HTML 5485 * @see self::COMMENT_AS_HTML_COMMENT 5486 * @see self::COMMENT_AS_PI_NODE_LOOKALIKE 5487 * 5488 * @since 6.6.0 Subclassed for the HTML Processor. 5489 * 5490 * @return string|null 5491 */ 5492 public function get_comment_type(): ?string { 5493 return $this->is_virtual() ? null : parent::get_comment_type(); 5494 } 5495 5496 /** 5497 * Removes a bookmark that is no longer needed. 5498 * 5499 * Releasing a bookmark frees up the small 5500 * performance overhead it requires. 5501 * 5502 * @since 6.4.0 5503 * 5504 * @param string $bookmark_name Name of the bookmark to remove. 5505 * @return bool Whether the bookmark already existed before removal. 5506 */ 5507 public function release_bookmark( $bookmark_name ): bool { 5508 return parent::release_bookmark( "_{$bookmark_name}" ); 5509 } 5510 5511 /** 5512 * Moves the internal cursor in the HTML Processor to a given bookmark's location. 5513 * 5514 * Be careful! Seeking backwards to a previous location resets the parser to the 5515 * start of the document and reparses the entire contents up until it finds the 5516 * sought-after bookmarked location. 5517 * 5518 * In order to prevent accidental infinite loops, there's a 5519 * maximum limit on the number of times seek() can be called. 5520 * 5521 * @throws Exception When unable to allocate a bookmark for the next token in the input HTML document. 5522 * 5523 * @since 6.4.0 5524 * 5525 * @param string $bookmark_name Jump to the place in the document identified by this bookmark name. 5526 * @return bool Whether the internal cursor was successfully moved to the bookmark's location. 5527 */ 5528 public function seek( $bookmark_name ): bool { 5529 // Flush any pending updates to the document before beginning. 5530 $this->get_updated_html(); 5531 5532 $actual_bookmark_name = "_{$bookmark_name}"; 5533 $processor_started_at = $this->state->current_token 5534 ? $this->bookmarks[ $this->state->current_token->bookmark_name ]->start 5535 : 0; 5536 $bookmark_starts_at = $this->bookmarks[ $actual_bookmark_name ]->start; 5537 $direction = $bookmark_starts_at > $processor_started_at ? 'forward' : 'backward'; 5538 5539 /* 5540 * If seeking backwards, it's possible that the sought-after bookmark exists within an element 5541 * which has been closed before the current cursor; in other words, it has already been removed 5542 * from the stack of open elements. This means that it's insufficient to simply pop off elements 5543 * from the stack of open elements which appear after the bookmarked location and then jump to 5544 * that location, as the elements which were open before won't be re-opened. 5545 * 5546 * In order to maintain consistency, the HTML Processor rewinds to the start of the document 5547 * and reparses everything until it finds the sought-after bookmark. 5548 * 5549 * There are potentially better ways to do this: cache the parser state for each bookmark and 5550 * restore it when seeking; store an immutable and idempotent register of where elements open 5551 * and close. 5552 * 5553 * If caching the parser state it will be essential to properly maintain the cached stack of 5554 * open elements and active formatting elements when modifying the document. This could be a 5555 * tedious and time-consuming process as well, and so for now will not be performed. 5556 * 5557 * It may be possible to track bookmarks for where elements open and close, and in doing so 5558 * be able to quickly recalculate breadcrumbs for any element in the document. It may even 5559 * be possible to remove the stack of open elements and compute it on the fly this way. 5560 * If doing this, the parser would need to track the opening and closing locations for all 5561 * tokens in the breadcrumb path for any and all bookmarks. By utilizing bookmarks themselves 5562 * this list could be automatically maintained while modifying the document. Finding the 5563 * breadcrumbs would then amount to traversing that list from the start until the token 5564 * being inspected. Once an element closes, if there are no bookmarks pointing to locations 5565 * within that element, then all of these locations may be forgotten to save on memory use 5566 * and computation time. 5567 */ 5568 if ( 'backward' === $direction ) { 5569 5570 /* 5571 * When moving backward, stateful stacks should be cleared. 5572 */ 5573 foreach ( $this->state->stack_of_open_elements->walk_up() as $item ) { 5574 $this->state->stack_of_open_elements->remove_node( $item ); 5575 } 5576 5577 foreach ( $this->state->active_formatting_elements->walk_up() as $item ) { 5578 $this->state->active_formatting_elements->remove_node( $item ); 5579 } 5580 5581 /* 5582 * **After** clearing stacks, more processor state can be reset. 5583 * This must be done after clearing the stack because those stacks generate events that 5584 * would appear on a subsequent call to `next_token()`. 5585 */ 5586 $this->state->frameset_ok = true; 5587 $this->state->stack_of_template_insertion_modes = array(); 5588 $this->state->head_element = null; 5589 $this->state->form_element = null; 5590 $this->state->current_token = null; 5591 $this->current_element = null; 5592 $this->element_queue = array(); 5593 5594 /* 5595 * The absence of a context node indicates a full parse. 5596 * The presence of a context node indicates a fragment parser. 5597 */ 5598 if ( null === $this->context_node ) { 5599 $this->change_parsing_namespace( 'html' ); 5600 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_INITIAL; 5601 $this->breadcrumbs = array(); 5602 5603 $this->bookmarks['initial'] = new WP_HTML_Span( 0, 0 ); 5604 parent::seek( 'initial' ); 5605 unset( $this->bookmarks['initial'] ); 5606 } else { 5607 5608 /* 5609 * Push the root-node (HTML) back onto the stack of open elements. 5610 * 5611 * Fragment parsers require this extra bit of setup. 5612 * It's handled in full parsers by advancing the processor state. 5613 */ 5614 $this->state->stack_of_open_elements->push( 5615 new WP_HTML_Token( 5616 'root-node', 5617 'HTML', 5618 false 5619 ) 5620 ); 5621 5622 $this->change_parsing_namespace( 5623 $this->context_node->integration_node_type 5624 ? 'html' 5625 : $this->context_node->namespace 5626 ); 5627 5628 if ( 'TEMPLATE' === $this->context_node->node_name ) { 5629 $this->state->stack_of_template_insertion_modes[] = WP_HTML_Processor_State::INSERTION_MODE_IN_TEMPLATE; 5630 } 5631 5632 $this->reset_insertion_mode_appropriately(); 5633 $this->breadcrumbs = array_slice( $this->breadcrumbs, 0, 2 ); 5634 parent::seek( $this->context_node->bookmark_name ); 5635 } 5636 } 5637 5638 /* 5639 * Here, the processor moves forward through the document until it matches the bookmark. 5640 * do-while is used here because the processor is expected to already be stopped on 5641 * a token than may match the bookmarked location. 5642 */ 5643 do { 5644 /* 5645 * The processor will stop on virtual tokens, but bookmarks may not be set on them. 5646 * They should not be matched when seeking a bookmark, skip them. 5647 */ 5648 if ( $this->is_virtual() ) { 5649 continue; 5650 } 5651 if ( $bookmark_starts_at === $this->bookmarks[ $this->state->current_token->bookmark_name ]->start ) { 5652 return true; 5653 } 5654 } while ( $this->next_token() ); 5655 5656 return false; 5657 } 5658 5659 /** 5660 * Sets a bookmark in the HTML document. 5661 * 5662 * Bookmarks represent specific places or tokens in the HTML 5663 * document, such as a tag opener or closer. When applying 5664 * edits to a document, such as setting an attribute, the 5665 * text offsets of that token may shift; the bookmark is 5666 * kept updated with those shifts and remains stable unless 5667 * the entire span of text in which the token sits is removed. 5668 * 5669 * Release bookmarks when they are no longer needed. 5670 * 5671 * Example: 5672 * 5673 * <main><h2>Surprising fact you may not know!</h2></main> 5674 * ^ ^ 5675 * \-|-- this `H2` opener bookmark tracks the token 5676 * 5677 * <main class="clickbait"><h2>Surprising fact you may no… 5678 * ^ ^ 5679 * \-|-- it shifts with edits 5680 * 5681 * Bookmarks provide the ability to seek to a previously-scanned 5682 * place in the HTML document. This avoids the need to re-scan 5683 * the entire document. 5684 * 5685 * Example: 5686 * 5687 * <ul><li>One</li><li>Two</li><li>Three</li></ul> 5688 * ^^^^ 5689 * want to note this last item 5690 * 5691 * $p = new WP_HTML_Tag_Processor( $html ); 5692 * $in_list = false; 5693 * while ( $p->next_tag( array( 'tag_closers' => $in_list ? 'visit' : 'skip' ) ) ) { 5694 * if ( 'UL' === $p->get_tag() ) { 5695 * if ( $p->is_tag_closer() ) { 5696 * $in_list = false; 5697 * $p->set_bookmark( 'resume' ); 5698 * if ( $p->seek( 'last-li' ) ) { 5699 * $p->add_class( 'last-li' ); 5700 * } 5701 * $p->seek( 'resume' ); 5702 * $p->release_bookmark( 'last-li' ); 5703 * $p->release_bookmark( 'resume' ); 5704 * } else { 5705 * $in_list = true; 5706 * } 5707 * } 5708 * 5709 * if ( 'LI' === $p->get_tag() ) { 5710 * $p->set_bookmark( 'last-li' ); 5711 * } 5712 * } 5713 * 5714 * Bookmarks intentionally hide the internal string offsets 5715 * to which they refer. They are maintained internally as 5716 * updates are applied to the HTML document and therefore 5717 * retain their "position" - the location to which they 5718 * originally pointed. The inability to use bookmarks with 5719 * functions like `substr` is therefore intentional to guard 5720 * against accidentally breaking the HTML. 5721 * 5722 * Because bookmarks allocate memory and require processing 5723 * for every applied update, they are limited and require 5724 * a name. They should not be created with programmatically-made 5725 * names, such as "li_{$index}" with some loop. As a general 5726 * rule they should only be created with string-literal names 5727 * like "start-of-section" or "last-paragraph". 5728 * 5729 * Bookmarks are a powerful tool to enable complicated behavior. 5730 * Consider double-checking that you need this tool if you are 5731 * reaching for it, as inappropriate use could lead to broken 5732 * HTML structure or unwanted processing overhead. 5733 * 5734 * Bookmarks cannot be set on tokens that do no appear in the original 5735 * HTML text. For example, the HTML `<table><td>` stops at tags `TABLE`, 5736 * `TBODY`, `TR`, and `TD`. The `TBODY` and `TR` tags do not appear in 5737 * the original HTML and cannot be used as bookmarks. 5738 * 5739 * @since 6.4.0 5740 * 5741 * @param string $bookmark_name Identifies this particular bookmark. 5742 * @return bool Whether the bookmark was successfully created. 5743 */ 5744 public function set_bookmark( $bookmark_name ): bool { 5745 if ( $this->is_virtual() ) { 5746 _doing_it_wrong( 5747 __METHOD__, 5748 __( 'Cannot set bookmarks on tokens that do no appear in the original HTML text.' ), 5749 '6.8.0' 5750 ); 5751 return false; 5752 } 5753 return parent::set_bookmark( "_{$bookmark_name}" ); 5754 } 5755 5756 /** 5757 * Checks whether a bookmark with the given name exists. 5758 * 5759 * @since 6.5.0 5760 * 5761 * @param string $bookmark_name Name to identify a bookmark that potentially exists. 5762 * @return bool Whether that bookmark exists. 5763 */ 5764 public function has_bookmark( $bookmark_name ): bool { 5765 return parent::has_bookmark( "_{$bookmark_name}" ); 5766 } 5767 5768 /* 5769 * HTML Parsing Algorithms 5770 */ 5771 5772 /** 5773 * Closes a P element. 5774 * 5775 * @since 6.4.0 5776 * @ignore 5777 * 5778 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. 5779 * 5780 * @see https://html.spec.whatwg.org/#close-a-p-element 5781 */ 5782 private function close_a_p_element(): void { 5783 $this->generate_implied_end_tags( 'P' ); 5784 $this->state->stack_of_open_elements->pop_until( 'P' ); 5785 } 5786 5787 /** 5788 * Closes elements that have implied end tags. 5789 * 5790 * @since 6.4.0 5791 * @since 6.7.0 Full spec support. 5792 * @ignore 5793 * 5794 * @see https://html.spec.whatwg.org/#generate-implied-end-tags 5795 * 5796 * @param string|null $except_for_this_element Perform as if this element doesn't exist in the stack of open elements. 5797 */ 5798 private function generate_implied_end_tags( ?string $except_for_this_element = null ): void { 5799 $elements_with_implied_end_tags = array( 5800 'DD', 5801 'DT', 5802 'LI', 5803 'OPTGROUP', 5804 'OPTION', 5805 'P', 5806 'RB', 5807 'RP', 5808 'RT', 5809 'RTC', 5810 ); 5811 5812 $no_exclusions = ! isset( $except_for_this_element ); 5813 5814 while ( 5815 ( $no_exclusions || ! $this->state->stack_of_open_elements->current_node_is( $except_for_this_element ) ) && 5816 in_array( $this->state->stack_of_open_elements->current_node()->node_name, $elements_with_implied_end_tags, true ) 5817 ) { 5818 $this->state->stack_of_open_elements->pop(); 5819 } 5820 } 5821 5822 /** 5823 * Closes elements that have implied end tags, thoroughly. 5824 * 5825 * See the HTML specification for an explanation why this is 5826 * different from generating end tags in the normal sense. 5827 * 5828 * @since 6.4.0 5829 * @since 6.7.0 Full spec support. 5830 * @ignore 5831 * 5832 * @see WP_HTML_Processor::generate_implied_end_tags 5833 * @see https://html.spec.whatwg.org/#generate-implied-end-tags 5834 */ 5835 private function generate_implied_end_tags_thoroughly(): void { 5836 $elements_with_implied_end_tags = array( 5837 'CAPTION', 5838 'COLGROUP', 5839 'DD', 5840 'DT', 5841 'LI', 5842 'OPTGROUP', 5843 'OPTION', 5844 'P', 5845 'RB', 5846 'RP', 5847 'RT', 5848 'RTC', 5849 'TBODY', 5850 'TD', 5851 'TFOOT', 5852 'TH', 5853 'THEAD', 5854 'TR', 5855 ); 5856 5857 while ( in_array( $this->state->stack_of_open_elements->current_node()->node_name, $elements_with_implied_end_tags, true ) ) { 5858 $this->state->stack_of_open_elements->pop(); 5859 } 5860 } 5861 5862 /** 5863 * Returns the adjusted current node. 5864 * 5865 * > The adjusted current node is the context element if the parser was created as 5866 * > part of the HTML fragment parsing algorithm and the stack of open elements 5867 * > has only one element in it (fragment case); otherwise, the adjusted current 5868 * > node is the current node. 5869 * 5870 * @see https://html.spec.whatwg.org/#adjusted-current-node 5871 * 5872 * @since 6.7.0 5873 * @ignore 5874 * 5875 * @return WP_HTML_Token|null The adjusted current node. 5876 */ 5877 private function get_adjusted_current_node(): ?WP_HTML_Token { 5878 if ( isset( $this->context_node ) && 1 === $this->state->stack_of_open_elements->count() ) { 5879 return $this->context_node; 5880 } 5881 5882 return $this->state->stack_of_open_elements->current_node(); 5883 } 5884 5885 /** 5886 * Reconstructs the active formatting elements. 5887 * 5888 * > This has the effect of reopening all the formatting elements that were opened 5889 * > in the current body, cell, or caption (whichever is youngest) that haven't 5890 * > been explicitly closed. 5891 * 5892 * @since 6.4.0 5893 * @ignore 5894 * 5895 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. 5896 * 5897 * @see https://html.spec.whatwg.org/#reconstruct-the-active-formatting-elements 5898 * 5899 * @return bool Whether any formatting elements needed to be reconstructed. 5900 */ 5901 private function reconstruct_active_formatting_elements(): bool { 5902 /* 5903 * > If there are no entries in the list of active formatting elements, then there is nothing 5904 * > to reconstruct; stop this algorithm. 5905 */ 5906 if ( 0 === $this->state->active_formatting_elements->count() ) { 5907 return false; 5908 } 5909 5910 $last_entry = $this->state->active_formatting_elements->current_node(); 5911 if ( 5912 5913 /* 5914 * > If the last (most recently added) entry in the list of active formatting elements is a marker; 5915 * > stop this algorithm. 5916 */ 5917 'marker' === $last_entry->node_name || 5918 5919 /* 5920 * > If the last (most recently added) entry in the list of active formatting elements is an 5921 * > element that is in the stack of open elements, then there is nothing to reconstruct; 5922 * > stop this algorithm. 5923 */ 5924 $this->state->stack_of_open_elements->contains_node( $last_entry ) 5925 ) { 5926 return false; 5927 } 5928 5929 $this->bail( 'Cannot reconstruct active formatting elements when advancing and rewinding is required.' ); 5930 } 5931 5932 /** 5933 * Runs the reset the insertion mode appropriately algorithm. 5934 * 5935 * @since 6.7.0 5936 * @ignore 5937 * 5938 * @see https://html.spec.whatwg.org/multipage/parsing.html#reset-the-insertion-mode-appropriately 5939 */ 5940 private function reset_insertion_mode_appropriately(): void { 5941 // Set the first node. 5942 $first_node = null; 5943 foreach ( $this->state->stack_of_open_elements->walk_down() as $first_node ) { 5944 break; 5945 } 5946 5947 /* 5948 * > 1. Let _last_ be false. 5949 */ 5950 $last = false; 5951 foreach ( $this->state->stack_of_open_elements->walk_up() as $node ) { 5952 /* 5953 * > 2. Let _node_ be the last node in the stack of open elements. 5954 * > 3. _Loop_: If _node_ is the first node in the stack of open elements, then set _last_ 5955 * > to true, and, if the parser was created as part of the HTML fragment parsing 5956 * > algorithm (fragment case), set node to the context element passed to 5957 * > that algorithm. 5958 * > … 5959 */ 5960 if ( $node === $first_node ) { 5961 $last = true; 5962 if ( isset( $this->context_node ) ) { 5963 $node = $this->context_node; 5964 } 5965 } 5966 5967 // All of the following rules are for matching HTML elements. 5968 if ( 'html' !== $node->namespace ) { 5969 continue; 5970 } 5971 5972 switch ( $node->node_name ) { 5973 /* 5974 * > 4. If _node_ is a `td` or `th` element and _last_ is false, then switch the 5975 * > insertion mode to "in cell" and return. 5976 */ 5977 case 'TD': 5978 case 'TH': 5979 if ( ! $last ) { 5980 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_CELL; 5981 return; 5982 } 5983 break; 5984 5985 /* 5986 * > 5. If _node_ is a `tr` element, then switch the insertion mode to "in row" 5987 * > and return. 5988 */ 5989 case 'TR': 5990 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_ROW; 5991 return; 5992 5993 /* 5994 * > 6. If _node_ is a `tbody`, `thead`, or `tfoot` element, then switch the 5995 * > insertion mode to "in table body" and return. 5996 */ 5997 case 'TBODY': 5998 case 'THEAD': 5999 case 'TFOOT': 6000 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE_BODY; 6001 return; 6002 6003 /* 6004 * > 7. If _node_ is a `caption` element, then switch the insertion mode to 6005 * > "in caption" and return. 6006 */ 6007 case 'CAPTION': 6008 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_CAPTION; 6009 return; 6010 6011 /* 6012 * > 8. If _node_ is a `colgroup` element, then switch the insertion mode to 6013 * > "in column group" and return. 6014 */ 6015 case 'COLGROUP': 6016 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_COLUMN_GROUP; 6017 return; 6018 6019 /* 6020 * > 9. If _node_ is a `table` element, then switch the insertion mode to 6021 * > "in table" and return. 6022 */ 6023 case 'TABLE': 6024 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE; 6025 return; 6026 6027 /* 6028 * > 10. If _node_ is a `template` element, then switch the insertion mode to the 6029 * > current template insertion mode and return. 6030 */ 6031 case 'TEMPLATE': 6032 $this->state->insertion_mode = end( $this->state->stack_of_template_insertion_modes ); 6033 return; 6034 6035 /* 6036 * > 11. If _node_ is a `head` element and _last_ is false, then switch the 6037 * > insertion mode to "in head" and return. 6038 */ 6039 case 'HEAD': 6040 if ( ! $last ) { 6041 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_HEAD; 6042 return; 6043 } 6044 break; 6045 6046 /* 6047 * > 12. If _node_ is a `body` element, then switch the insertion mode to "in body" 6048 * > and return. 6049 */ 6050 case 'BODY': 6051 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_BODY; 6052 return; 6053 6054 /* 6055 * > 13. If _node_ is a `frameset` element, then switch the insertion mode to 6056 * > "in frameset" and return. (fragment case) 6057 */ 6058 case 'FRAMESET': 6059 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_FRAMESET; 6060 return; 6061 6062 /* 6063 * > 14. If _node_ is an `html` element, run these substeps: 6064 * > 1. If the head element pointer is null, switch the insertion mode to 6065 * > "before head" and return. (fragment case) 6066 * > 2. Otherwise, the head element pointer is not null, switch the insertion 6067 * > mode to "after head" and return. 6068 */ 6069 case 'HTML': 6070 $this->state->insertion_mode = isset( $this->state->head_element ) 6071 ? WP_HTML_Processor_State::INSERTION_MODE_AFTER_HEAD 6072 : WP_HTML_Processor_State::INSERTION_MODE_BEFORE_HEAD; 6073 return; 6074 } 6075 } 6076 6077 /* 6078 * > 15. If _last_ is true, then switch the insertion mode to "in body" 6079 * > and return. (fragment case) 6080 * 6081 * This is only reachable if `$last` is true, as per the fragment parsing case. 6082 */ 6083 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_BODY; 6084 } 6085 6086 /** 6087 * Runs the adoption agency algorithm. 6088 * 6089 * @since 6.4.0 6090 * @ignore 6091 * 6092 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input. 6093 * 6094 * @see https://html.spec.whatwg.org/#adoption-agency-algorithm 6095 */ 6096 private function run_adoption_agency_algorithm(): void { 6097 $budget = 1000; 6098 $subject = $this->get_tag(); 6099 $current_node = $this->state->stack_of_open_elements->current_node(); 6100 6101 if ( 6102 // > If the current node is an HTML element whose tag name is subject 6103 $current_node && $subject === $current_node->node_name && 6104 // > the current node is not in the list of active formatting elements 6105 ! $this->state->active_formatting_elements->contains_node( $current_node ) 6106 ) { 6107 $this->state->stack_of_open_elements->pop(); 6108 return; 6109 } 6110 6111 $outer_loop_counter = 0; 6112 while ( $budget-- > 0 ) { 6113 if ( $outer_loop_counter++ >= 8 ) { 6114 return; 6115 } 6116 6117 /* 6118 * > Let formatting element be the last element in the list of active formatting elements that: 6119 * > - is between the end of the list and the last marker in the list, 6120 * > if any, or the start of the list otherwise, 6121 * > - and has the tag name subject. 6122 */ 6123 $formatting_element = null; 6124 foreach ( $this->state->active_formatting_elements->walk_up() as $item ) { 6125 if ( 'marker' === $item->node_name ) { 6126 break; 6127 } 6128 6129 if ( $subject === $item->node_name ) { 6130 $formatting_element = $item; 6131 break; 6132 } 6133 } 6134 6135 // > If there is no such element, then return and instead act as described in the "any other end tag" entry above. 6136 if ( null === $formatting_element ) { 6137 $this->bail( 'Cannot run adoption agency when "any other end tag" is required.' ); 6138 } 6139 6140 // > 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. 6141 if ( ! $this->state->stack_of_open_elements->contains_node( $formatting_element ) ) { 6142 $this->state->active_formatting_elements->remove_node( $formatting_element ); 6143 return; 6144 } 6145 6146 // > If formatting element is in the stack of open elements, but the element is not in scope, then this is a parse error; return. 6147 if ( ! $this->state->stack_of_open_elements->has_element_in_scope( $formatting_element->node_name ) ) { 6148 return; 6149 } 6150 6151 /* 6152 * > Let furthest block be the topmost node in the stack of open elements that is lower in the stack 6153 * > than formatting element, and is an element in the special category. There might not be one. 6154 */ 6155 $is_above_formatting_element = true; 6156 $furthest_block = null; 6157 foreach ( $this->state->stack_of_open_elements->walk_down() as $item ) { 6158 if ( $is_above_formatting_element && $formatting_element->bookmark_name !== $item->bookmark_name ) { 6159 continue; 6160 } 6161 6162 if ( $is_above_formatting_element ) { 6163 $is_above_formatting_element = false; 6164 continue; 6165 } 6166 6167 if ( self::is_special( $item ) ) { 6168 $furthest_block = $item; 6169 break; 6170 } 6171 } 6172 6173 /* 6174 * > If there is no furthest block, then the UA must first pop all the nodes from the bottom of the 6175 * > stack of open elements, from the current node up to and including formatting element, then 6176 * > remove formatting element from the list of active formatting elements, and finally return. 6177 */ 6178 if ( null === $furthest_block ) { 6179 foreach ( $this->state->stack_of_open_elements->walk_up() as $item ) { 6180 $this->state->stack_of_open_elements->pop(); 6181 6182 if ( $formatting_element->bookmark_name === $item->bookmark_name ) { 6183 $this->state->active_formatting_elements->remove_node( $formatting_element ); 6184 return; 6185 } 6186 } 6187 } 6188 6189 $this->bail( 'Cannot extract common ancestor in adoption agency algorithm.' ); 6190 } 6191 6192 $this->bail( 'Cannot run adoption agency when looping required.' ); 6193 } 6194 6195 /** 6196 * Runs the "close the cell" algorithm. 6197 * 6198 * > Where the steps above say to close the cell, they mean to run the following algorithm: 6199 * > 1. Generate implied end tags. 6200 * > 2. If the current node is not now a td element or a th element, then this is a parse error. 6201 * > 3. Pop elements from the stack of open elements stack until a td element or a th element has been popped from the stack. 6202 * > 4. Clear the list of active formatting elements up to the last marker. 6203 * > 5. Switch the insertion mode to "in row". 6204 * 6205 * @see https://html.spec.whatwg.org/multipage/parsing.html#close-the-cell 6206 * 6207 * @since 6.7.0 6208 * @ignore 6209 */ 6210 private function close_cell(): void { 6211 $this->generate_implied_end_tags(); 6212 // @todo Parse error if the current node is a "td" or "th" element. 6213 foreach ( $this->state->stack_of_open_elements->walk_up() as $element ) { 6214 $this->state->stack_of_open_elements->pop(); 6215 if ( 'TD' === $element->node_name || 'TH' === $element->node_name ) { 6216 break; 6217 } 6218 } 6219 $this->state->active_formatting_elements->clear_up_to_last_marker(); 6220 $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_ROW; 6221 } 6222 6223 /** 6224 * Inserts an HTML element on the stack of open elements. 6225 * 6226 * @since 6.4.0 6227 * @ignore 6228 * 6229 * @see https://html.spec.whatwg.org/#insert-a-foreign-element 6230 * 6231 * @param WP_HTML_Token $token Name of bookmark pointing to element in original input HTML. 6232 */ 6233 private function insert_html_element( WP_HTML_Token $token ): void { 6234 $this->state->stack_of_open_elements->push( $token ); 6235 } 6236 6237 /** 6238 * Inserts a foreign element on to the stack of open elements. 6239 * 6240 * @since 6.7.0 6241 * @ignore 6242 * 6243 * @see https://html.spec.whatwg.org/#insert-a-foreign-element 6244 * 6245 * @param WP_HTML_Token $token Insert this token. The token's namespace and 6246 * insertion point will be updated correctly. 6247 * @param bool $only_add_to_element_stack Whether to skip the "insert an element at the adjusted 6248 * insertion location" algorithm when adding this element. 6249 */ 6250 private function insert_foreign_element( WP_HTML_Token $token, bool $only_add_to_element_stack ): void { 6251 $adjusted_current_node = $this->get_adjusted_current_node(); 6252 6253 $token->namespace = $adjusted_current_node ? $adjusted_current_node->namespace : 'html'; 6254 6255 if ( $this->is_mathml_integration_point() ) { 6256 $token->integration_node_type = 'math'; 6257 } elseif ( $this->is_html_integration_point() ) { 6258 $token->integration_node_type = 'html'; 6259 } 6260 6261 if ( false === $only_add_to_element_stack ) { 6262 /* 6263 * @todo Implement the "appropriate place for inserting a node" and the 6264 * "insert an element at the adjusted insertion location" algorithms. 6265 * 6266 * These algorithms mostly impacts DOM tree construction and not the HTML API. 6267 * Here, there's no DOM node onto which the element will be appended, so the 6268 * parser will skip this step. 6269 * 6270 * @see https://html.spec.whatwg.org/#insert-an-element-at-the-adjusted-insertion-location 6271 */ 6272 } 6273 6274 $this->insert_html_element( $token ); 6275 } 6276 6277 /** 6278 * Inserts a virtual element on the stack of open elements. 6279 * 6280 * @since 6.7.0 6281 * @ignore 6282 * 6283 * @throws Exception When unable to allocate a bookmark for the next token in the input HTML document. 6284 * 6285 * @param string $token_name Name of token to create and insert into the stack of open elements. 6286 * @param string|null $bookmark_name Optional. Name to give bookmark for created virtual node. 6287 * Defaults to auto-creating a bookmark name. 6288 * @return WP_HTML_Token Newly-created virtual token. 6289 */ 6290 private function insert_virtual_node( $token_name, $bookmark_name = null ): WP_HTML_Token { 6291 $here = $this->bookmarks[ $this->state->current_token->bookmark_name ]; 6292 $name = $bookmark_name ?? $this->bookmark_token(); 6293 6294 $this->bookmarks[ $name ] = new WP_HTML_Span( $here->start, 0 ); 6295 6296 $token = new WP_HTML_Token( $name, $token_name, false ); 6297 $this->insert_html_element( $token ); 6298 return $token; 6299 } 6300 6301 /* 6302 * HTML Specification Helpers 6303 */ 6304 6305 /** 6306 * Indicates if the current token is a MathML integration point. 6307 * 6308 * @since 6.7.0 6309 * @ignore 6310 * 6311 * @see https://html.spec.whatwg.org/#mathml-text-integration-point 6312 * 6313 * @return bool Whether the current token is a MathML integration point. 6314 */ 6315 private function is_mathml_integration_point(): bool { 6316 $current_token = $this->state->current_token; 6317 if ( ! isset( $current_token ) ) { 6318 return false; 6319 } 6320 6321 if ( 'math' !== $current_token->namespace || 'M' !== $current_token->node_name[0] ) { 6322 return false; 6323 } 6324 6325 $tag_name = $current_token->node_name; 6326 6327 return ( 6328 'MI' === $tag_name || 6329 'MO' === $tag_name || 6330 'MN' === $tag_name || 6331 'MS' === $tag_name || 6332 'MTEXT' === $tag_name 6333 ); 6334 } 6335 6336 /** 6337 * Indicates if the current token is an HTML integration point. 6338 * 6339 * Note that this method must be an instance method with access 6340 * to the current token, since it needs to examine the attributes 6341 * of the currently-matched tag, if it's in the MathML namespace. 6342 * Otherwise it would be required to scan the HTML and ensure that 6343 * no other accounting is overlooked. 6344 * 6345 * @since 6.7.0 6346 * @ignore 6347 * 6348 * @see https://html.spec.whatwg.org/#html-integration-point 6349 * 6350 * @return bool Whether the current token is an HTML integration point. 6351 */ 6352 private function is_html_integration_point(): bool { 6353 $current_token = $this->state->current_token; 6354 if ( ! isset( $current_token ) ) { 6355 return false; 6356 } 6357 6358 if ( 'html' === $current_token->namespace ) { 6359 return false; 6360 } 6361 6362 $tag_name = $current_token->node_name; 6363 6364 if ( 'svg' === $current_token->namespace ) { 6365 return ( 6366 'DESC' === $tag_name || 6367 'FOREIGNOBJECT' === $tag_name || 6368 'TITLE' === $tag_name 6369 ); 6370 } 6371 6372 if ( 'math' === $current_token->namespace ) { 6373 if ( 'ANNOTATION-XML' !== $tag_name ) { 6374 return false; 6375 } 6376 6377 $encoding = $this->get_attribute( 'encoding' ); 6378 6379 return ( 6380 is_string( $encoding ) && 6381 ( 6382 0 === strcasecmp( $encoding, 'application/xhtml+xml' ) || 6383 0 === strcasecmp( $encoding, 'text/html' ) 6384 ) 6385 ); 6386 } 6387 6388 $this->bail( 'Should not have reached end of HTML Integration Point detection: check HTML API code.' ); 6389 // This unnecessary return prevents tools from inaccurately reporting type errors. 6390 return false; 6391 } 6392 6393 /** 6394 * Returns whether an element of a given name is in the HTML special category. 6395 * 6396 * @since 6.4.0 6397 * 6398 * @see https://html.spec.whatwg.org/#special 6399 * 6400 * @param WP_HTML_Token|string $tag_name Node to check, or only its name if in the HTML namespace. 6401 * @return bool Whether the element of the given name is in the special category. 6402 */ 6403 public static function is_special( $tag_name ): bool { 6404 if ( is_string( $tag_name ) ) { 6405 $tag_name = strtoupper( $tag_name ); 6406 } else { 6407 $tag_name = 'html' === $tag_name->namespace 6408 ? strtoupper( $tag_name->node_name ) 6409 : "{$tag_name->namespace} {$tag_name->node_name}"; 6410 } 6411 6412 return ( 6413 'ADDRESS' === $tag_name || 6414 'APPLET' === $tag_name || 6415 'AREA' === $tag_name || 6416 'ARTICLE' === $tag_name || 6417 'ASIDE' === $tag_name || 6418 'BASE' === $tag_name || 6419 'BASEFONT' === $tag_name || 6420 'BGSOUND' === $tag_name || 6421 'BLOCKQUOTE' === $tag_name || 6422 'BODY' === $tag_name || 6423 'BR' === $tag_name || 6424 'BUTTON' === $tag_name || 6425 'CAPTION' === $tag_name || 6426 'CENTER' === $tag_name || 6427 'COL' === $tag_name || 6428 'COLGROUP' === $tag_name || 6429 'DD' === $tag_name || 6430 'DETAILS' === $tag_name || 6431 'DIR' === $tag_name || 6432 'DIV' === $tag_name || 6433 'DL' === $tag_name || 6434 'DT' === $tag_name || 6435 'EMBED' === $tag_name || 6436 'FIELDSET' === $tag_name || 6437 'FIGCAPTION' === $tag_name || 6438 'FIGURE' === $tag_name || 6439 'FOOTER' === $tag_name || 6440 'FORM' === $tag_name || 6441 'FRAME' === $tag_name || 6442 'FRAMESET' === $tag_name || 6443 'H1' === $tag_name || 6444 'H2' === $tag_name || 6445 'H3' === $tag_name || 6446 'H4' === $tag_name || 6447 'H5' === $tag_name || 6448 'H6' === $tag_name || 6449 'HEAD' === $tag_name || 6450 'HEADER' === $tag_name || 6451 'HGROUP' === $tag_name || 6452 'HR' === $tag_name || 6453 'HTML' === $tag_name || 6454 'IFRAME' === $tag_name || 6455 'IMG' === $tag_name || 6456 'INPUT' === $tag_name || 6457 'KEYGEN' === $tag_name || 6458 'LI' === $tag_name || 6459 'LINK' === $tag_name || 6460 'LISTING' === $tag_name || 6461 'MAIN' === $tag_name || 6462 'MARQUEE' === $tag_name || 6463 'MENU' === $tag_name || 6464 'META' === $tag_name || 6465 'NAV' === $tag_name || 6466 'NOEMBED' === $tag_name || 6467 'NOFRAMES' === $tag_name || 6468 'NOSCRIPT' === $tag_name || 6469 'OBJECT' === $tag_name || 6470 'OL' === $tag_name || 6471 'P' === $tag_name || 6472 'PARAM' === $tag_name || 6473 'PLAINTEXT' === $tag_name || 6474 'PRE' === $tag_name || 6475 'SCRIPT' === $tag_name || 6476 'SEARCH' === $tag_name || 6477 'SECTION' === $tag_name || 6478 'SELECT' === $tag_name || 6479 'SOURCE' === $tag_name || 6480 'STYLE' === $tag_name || 6481 'SUMMARY' === $tag_name || 6482 'TABLE' === $tag_name || 6483 'TBODY' === $tag_name || 6484 'TD' === $tag_name || 6485 'TEMPLATE' === $tag_name || 6486 'TEXTAREA' === $tag_name || 6487 'TFOOT' === $tag_name || 6488 'TH' === $tag_name || 6489 'THEAD' === $tag_name || 6490 'TITLE' === $tag_name || 6491 'TR' === $tag_name || 6492 'TRACK' === $tag_name || 6493 'UL' === $tag_name || 6494 'WBR' === $tag_name || 6495 'XMP' === $tag_name || 6496 6497 // MathML. 6498 'math MI' === $tag_name || 6499 'math MO' === $tag_name || 6500 'math MN' === $tag_name || 6501 'math MS' === $tag_name || 6502 'math MTEXT' === $tag_name || 6503 'math ANNOTATION-XML' === $tag_name || 6504 6505 // SVG. 6506 'svg DESC' === $tag_name || 6507 'svg FOREIGNOBJECT' === $tag_name || 6508 'svg TITLE' === $tag_name 6509 ); 6510 } 6511 6512 /** 6513 * Returns whether a given element is an HTML Void Element 6514 * 6515 * > area, base, br, col, embed, hr, img, input, link, meta, source, track, wbr 6516 * 6517 * @since 6.4.0 6518 * 6519 * @see https://html.spec.whatwg.org/#void-elements 6520 * 6521 * @param string $tag_name Name of HTML tag to check. 6522 * @return bool Whether the given tag is an HTML Void Element. 6523 */ 6524 public static function is_void( $tag_name ): bool { 6525 $tag_name = strtoupper( $tag_name ); 6526 6527 return ( 6528 'AREA' === $tag_name || 6529 'BASE' === $tag_name || 6530 'BASEFONT' === $tag_name || // Obsolete but still treated as void. 6531 'BGSOUND' === $tag_name || // Obsolete but still treated as void. 6532 'BR' === $tag_name || 6533 'COL' === $tag_name || 6534 'EMBED' === $tag_name || 6535 'FRAME' === $tag_name || 6536 'HR' === $tag_name || 6537 'IMG' === $tag_name || 6538 'INPUT' === $tag_name || 6539 'KEYGEN' === $tag_name || // Obsolete but still treated as void. 6540 'LINK' === $tag_name || 6541 'META' === $tag_name || 6542 'PARAM' === $tag_name || // Obsolete but still treated as void. 6543 'SOURCE' === $tag_name || 6544 'TRACK' === $tag_name || 6545 'WBR' === $tag_name 6546 ); 6547 } 6548 6549 /** 6550 * Gets an encoding from a given string. 6551 * 6552 * This is an algorithm defined in the WHAT-WG specification. 6553 * 6554 * Example: 6555 * 6556 * 'UTF-8' === self::get_encoding( 'utf8' ); 6557 * 'UTF-8' === self::get_encoding( " \tUTF-8 " ); 6558 * null === self::get_encoding( 'UTF-7' ); 6559 * null === self::get_encoding( 'utf8; charset=' ); 6560 * 6561 * @see https://encoding.spec.whatwg.org/#concept-encoding-get 6562 * 6563 * @todo As this parser only supports UTF-8, only the UTF-8 6564 * encodings are detected. Add more as desired, but the 6565 * parser will bail on non-UTF-8 encodings. 6566 * 6567 * @since 6.7.0 6568 * 6569 * @param string $label A string which may specify a known encoding. 6570 * @return string|null Known encoding if matched, otherwise null. 6571 */ 6572 protected static function get_encoding( string $label ): ?string { 6573 /* 6574 * > Remove any leading and trailing ASCII whitespace from label. 6575 */ 6576 $label = trim( $label, " \t\f\r\n" ); 6577 6578 /* 6579 * > If label is an ASCII case-insensitive match for any of the labels listed in the 6580 * > table below, then return the corresponding encoding; otherwise return failure. 6581 */ 6582 switch ( strtolower( $label ) ) { 6583 case 'unicode-1-1-utf-8': 6584 case 'unicode11utf8': 6585 case 'unicode20utf8': 6586 case 'utf-8': 6587 case 'utf8': 6588 case 'x-unicode20utf8': 6589 return 'UTF-8'; 6590 6591 default: 6592 return null; 6593 } 6594 } 6595 6596 /* 6597 * Constants that would pollute the top of the class if they were found there. 6598 */ 6599 6600 /** 6601 * Indicates that the next HTML token should be parsed and processed. 6602 * 6603 * @since 6.4.0 6604 * 6605 * @var string 6606 */ 6607 const PROCESS_NEXT_NODE = 'process-next-node'; 6608 6609 /** 6610 * Indicates that the current HTML token should be reprocessed in the newly-selected insertion mode. 6611 * 6612 * @since 6.4.0 6613 * 6614 * @var string 6615 */ 6616 const REPROCESS_CURRENT_NODE = 'reprocess-current-node'; 6617 6618 /** 6619 * Indicates that the current HTML token should be processed without advancing the parser. 6620 * 6621 * @since 6.5.0 6622 * 6623 * @var string 6624 */ 6625 const PROCESS_CURRENT_NODE = 'process-current-node'; 6626 6627 /** 6628 * Indicates that the parser encountered unsupported markup and has bailed. 6629 * 6630 * @since 6.4.0 6631 * 6632 * @var string 6633 */ 6634 const ERROR_UNSUPPORTED = 'unsupported'; 6635 6636 /** 6637 * Indicates that the parser encountered more HTML tokens than it 6638 * was able to process and has bailed. 6639 * 6640 * @since 6.4.0 6641 * 6642 * @var string 6643 */ 6644 const ERROR_EXCEEDED_MAX_BOOKMARKS = 'exceeded-max-bookmarks'; 6645 6646 /** 6647 * Unlock code that must be passed into the constructor to create this class. 6648 * 6649 * This class extends the WP_HTML_Tag_Processor, which has a public class 6650 * constructor. Therefore, it's not possible to have a private constructor here. 6651 * 6652 * This unlock code is used to ensure that anyone calling the constructor is 6653 * doing so with a full understanding that it's intended to be a private API. 6654 * 6655 * @access private 6656 */ 6657 const CONSTRUCTOR_UNLOCK_CODE = 'Use WP_HTML_Processor::create_fragment() instead of calling the class constructor directly.'; 6658 }
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| Generated : Thu Jul 16 08:20:16 2026 | Cross-referenced by PHPXref |