| [ Index ] |
PHP Cross Reference of WordPress Trunk (Updated Daily) |
[Summary view] [Print] [Text view]
1 <?php 2 /** 3 * HTML API: WP_HTML_Doctype_Info class 4 * 5 * @package WordPress 6 * @subpackage HTML-API 7 * @since 6.7.0 8 */ 9 10 /** 11 * Core class used by the HTML API to represent a DOCTYPE declaration. 12 * 13 * This class parses DOCTYPE tokens for the full parser in the HTML Processor. 14 * Most code interacting with HTML won't need to parse DOCTYPE declarations; 15 * the HTML Processor is one exception. Consult the HTML Processor for proper 16 * parsing of an HTML document. 17 * 18 * A DOCTYPE declaration may indicate its document compatibility mode, which impacts 19 * the structure of the following HTML as well as the behavior of CSS class selectors. 20 * There are three possible modes: 21 * 22 * - "no-quirks" and "limited-quirks" modes (also called "standards mode"). 23 * - "quirks" mode. 24 * 25 * These modes mostly determine whether CSS class name selectors match values in the 26 * HTML `class` attribute in an ASCII-case-insensitive way (quirks mode), or whether 27 * they match only when byte-for-byte identical (no-quirks mode). 28 * 29 * All HTML documents should start with the standard HTML5 DOCTYPE: `<!DOCTYPE html>`. 30 * 31 * > DOCTYPEs are required for legacy reasons. When omitted, browsers tend to use a different 32 * > rendering mode that is incompatible with some specifications. Including the DOCTYPE in a 33 * > document ensures that the browser makes a best-effort attempt at following the 34 * > relevant specifications. 35 * 36 * @see https://html.spec.whatwg.org/#the-doctype 37 * 38 * DOCTYPE declarations comprise four properties: a name, public identifier, system identifier, 39 * and an indication of which document compatibility mode they would imply if an HTML parser 40 * hadn't already determined it from other information. 41 * 42 * @see https://html.spec.whatwg.org/#the-initial-insertion-mode 43 * 44 * Historically, the DOCTYPE declaration was used in SGML documents to instruct a parser how 45 * to interpret the various tags and entities within a document. Its role in HTML diverged 46 * from how it was used in SGML and no meaning should be back-read into HTML based on how it 47 * is used in SGML, XML, or XHTML documents. 48 * 49 * @see https://www.iso.org/standard/16387.html 50 * 51 * @since 6.7.0 52 * 53 * @access private 54 * 55 * @see WP_HTML_Processor 56 */ 57 class WP_HTML_Doctype_Info { 58 /** 59 * Name of the DOCTYPE: should be "html" for HTML documents. 60 * 61 * This value should be considered "read only" and not modified. 62 * 63 * Historically the DOCTYPE name indicates name of the document's root element. 64 * 65 * <!DOCTYPE html> 66 * ╰──┴── name is "html". 67 * 68 * @see https://html.spec.whatwg.org/#tokenization 69 * 70 * @since 6.7.0 71 * 72 * @var string|null 73 */ 74 public $name = null; 75 76 /** 77 * Public identifier of the DOCTYPE. 78 * 79 * This value should be considered "read only" and not modified. 80 * 81 * The public identifier is optional and should not appear in HTML documents. 82 * A `null` value indicates that no public identifier was present in the DOCTYPE. 83 * 84 * Historically the presence of the public identifier indicated that a document 85 * was meant to be shared between computer systems and the value indicated to a 86 * knowledgeable parser how to find the relevant document type definition (DTD). 87 * 88 * <!DOCTYPE html PUBLIC "public id goes here in quotes"> 89 * │ │ ╰─── public identifier ─────╯ 90 * ╰──┴── name is "html". 91 * 92 * @see https://html.spec.whatwg.org/#tokenization 93 * 94 * @since 6.7.0 95 * 96 * @var string|null 97 */ 98 public $public_identifier = null; 99 100 /** 101 * System identifier of the DOCTYPE. 102 * 103 * This value should be considered "read only" and not modified. 104 * 105 * The system identifier is optional and should not appear in HTML documents. 106 * A `null` value indicates that no system identifier was present in the DOCTYPE. 107 * 108 * Historically the system identifier specified where a relevant document type 109 * declaration for the given document is stored and may be retrieved. 110 * 111 * <!DOCTYPE html SYSTEM "system id goes here in quotes"> 112 * │ │ ╰──── system identifier ────╯ 113 * ╰──┴── name is "html". 114 * 115 * If a public identifier were provided it would indicate to a knowledgeable 116 * parser how to interpret the system identifier. 117 * 118 * <!DOCTYPE html PUBLIC "public id goes here in quotes" "system id goes here in quotes"> 119 * │ │ ╰─── public identifier ─────╯ ╰──── system identifier ────╯ 120 * ╰──┴── name is "html". 121 * 122 * @see https://html.spec.whatwg.org/#tokenization 123 * 124 * @since 6.7.0 125 * 126 * @var string|null 127 */ 128 public $system_identifier = null; 129 130 /** 131 * Which document compatibility mode this DOCTYPE declaration indicates. 132 * 133 * This value should be considered "read only" and not modified. 134 * 135 * When an HTML parser has not already set the document compatibility mode, 136 * (e.g. "quirks" or "no-quirks" mode), it will infer if from the properties 137 * of the appropriate DOCTYPE declaration, if one exists. The DOCTYPE can 138 * indicate one of three possible document compatibility modes: 139 * 140 * - "no-quirks" and "limited-quirks" modes (also called "standards" mode). 141 * - "quirks" mode (also called `CSS1Compat` mode). 142 * 143 * An appropriate DOCTYPE is one encountered in the "initial" insertion mode, 144 * before the HTML element has been opened and before finding any other 145 * DOCTYPE declaration tokens. 146 * 147 * @see https://html.spec.whatwg.org/#the-initial-insertion-mode 148 * 149 * @since 6.7.0 150 * 151 * @var string One of "no-quirks", "limited-quirks", or "quirks". 152 */ 153 public $indicated_compatability_mode; 154 155 /** 156 * Constructor. 157 * 158 * This class should not be instantiated directly. 159 * Use the static {@see self::from_doctype_token} method instead. 160 * 161 * The arguments to this constructor correspond to the "DOCTYPE token" 162 * as defined in the HTML specification. 163 * 164 * > DOCTYPE tokens have a name, a public identifier, a system identifier, 165 * > and a force-quirks flag. When a DOCTYPE token is created, its name, public identifier, 166 * > and system identifier must be marked as missing (which is a distinct state from the 167 * > empty string), and the force-quirks flag must be set to off (its other state is on). 168 * 169 * @see https://html.spec.whatwg.org/multipage/parsing.html#tokenization 170 * 171 * @since 6.7.0 172 * 173 * @param string|null $name Name of the DOCTYPE. 174 * @param string|null $public_identifier Public identifier of the DOCTYPE. 175 * @param string|null $system_identifier System identifier of the DOCTYPE. 176 * @param bool $force_quirks_flag Whether the force-quirks flag is set for the token. 177 */ 178 private function __construct( 179 ?string $name, 180 ?string $public_identifier, 181 ?string $system_identifier, 182 bool $force_quirks_flag 183 ) { 184 $this->name = $name; 185 $this->public_identifier = $public_identifier; 186 $this->system_identifier = $system_identifier; 187 188 /* 189 * > If the DOCTYPE token matches one of the conditions in the following list, 190 * > then set the Document to quirks mode: 191 */ 192 193 /* 194 * > The force-quirks flag is set to on. 195 */ 196 if ( $force_quirks_flag ) { 197 $this->indicated_compatability_mode = 'quirks'; 198 return; 199 } 200 201 /* 202 * Normative documents will contain the literal `<!DOCTYPE html>` with no 203 * public or system identifiers; short-circuit to avoid extra parsing. 204 */ 205 if ( 'html' === $name && null === $public_identifier && null === $system_identifier ) { 206 $this->indicated_compatability_mode = 'no-quirks'; 207 return; 208 } 209 210 /* 211 * > The name is not "html". 212 * 213 * The tokenizer must report the name in lower case even if provided in 214 * the document in upper case; thus no conversion is required here. 215 */ 216 if ( 'html' !== $name ) { 217 $this->indicated_compatability_mode = 'quirks'; 218 return; 219 } 220 221 /* 222 * Set up some variables to handle the rest of the conditions. 223 * 224 * > set...the public identifier...to...the empty string if the public identifier was missing. 225 * > set...the system identifier...to...the empty string if the system identifier was missing. 226 * > 227 * > The system identifier and public identifier strings must be compared... 228 * > in an ASCII case-insensitive manner. 229 * > 230 * > A system identifier whose value is the empty string is not considered missing 231 * > for the purposes of the conditions above. 232 */ 233 $system_identifier_is_missing = null === $system_identifier; 234 $public_identifier = null === $public_identifier ? '' : strtolower( $public_identifier ); 235 $system_identifier = null === $system_identifier ? '' : strtolower( $system_identifier ); 236 237 /* 238 * > The public identifier is set to… 239 */ 240 if ( 241 '-//w3o//dtd w3 html strict 3.0//en//' === $public_identifier || 242 '-/w3c/dtd html 4.0 transitional/en' === $public_identifier || 243 'html' === $public_identifier 244 ) { 245 $this->indicated_compatability_mode = 'quirks'; 246 return; 247 } 248 249 /* 250 * > The system identifier is set to… 251 */ 252 if ( 'http://www.ibm.com/data/dtd/v11/ibmxhtml1-transitional.dtd' === $system_identifier ) { 253 $this->indicated_compatability_mode = 'quirks'; 254 return; 255 } 256 257 /* 258 * All of the following conditions depend on matching the public identifier. 259 * If the public identifier is empty, none of the following conditions will match. 260 */ 261 if ( '' === $public_identifier ) { 262 $this->indicated_compatability_mode = 'no-quirks'; 263 return; 264 } 265 266 /* 267 * > The public identifier starts with… 268 * 269 * @todo Optimize this matching. It shouldn't be a large overall performance issue, 270 * however, as only a single DOCTYPE declaration token should ever be parsed, 271 * and normative documents will have exited before reaching this condition. 272 */ 273 if ( 274 str_starts_with( $public_identifier, '+//silmaril//dtd html pro v0r11 19970101//' ) || 275 str_starts_with( $public_identifier, '-//as//dtd html 3.0 aswedit + extensions//' ) || 276 str_starts_with( $public_identifier, '-//advasoft ltd//dtd html 3.0 aswedit + extensions//' ) || 277 str_starts_with( $public_identifier, '-//ietf//dtd html 2.0 level 1//' ) || 278 str_starts_with( $public_identifier, '-//ietf//dtd html 2.0 level 2//' ) || 279 str_starts_with( $public_identifier, '-//ietf//dtd html 2.0 strict level 1//' ) || 280 str_starts_with( $public_identifier, '-//ietf//dtd html 2.0 strict level 2//' ) || 281 str_starts_with( $public_identifier, '-//ietf//dtd html 2.0 strict//' ) || 282 str_starts_with( $public_identifier, '-//ietf//dtd html 2.0//' ) || 283 str_starts_with( $public_identifier, '-//ietf//dtd html 2.1e//' ) || 284 str_starts_with( $public_identifier, '-//ietf//dtd html 3.0//' ) || 285 str_starts_with( $public_identifier, '-//ietf//dtd html 3.2 final//' ) || 286 str_starts_with( $public_identifier, '-//ietf//dtd html 3.2//' ) || 287 str_starts_with( $public_identifier, '-//ietf//dtd html 3//' ) || 288 str_starts_with( $public_identifier, '-//ietf//dtd html level 0//' ) || 289 str_starts_with( $public_identifier, '-//ietf//dtd html level 1//' ) || 290 str_starts_with( $public_identifier, '-//ietf//dtd html level 2//' ) || 291 str_starts_with( $public_identifier, '-//ietf//dtd html level 3//' ) || 292 str_starts_with( $public_identifier, '-//ietf//dtd html strict level 0//' ) || 293 str_starts_with( $public_identifier, '-//ietf//dtd html strict level 1//' ) || 294 str_starts_with( $public_identifier, '-//ietf//dtd html strict level 2//' ) || 295 str_starts_with( $public_identifier, '-//ietf//dtd html strict level 3//' ) || 296 str_starts_with( $public_identifier, '-//ietf//dtd html strict//' ) || 297 str_starts_with( $public_identifier, '-//ietf//dtd html//' ) || 298 str_starts_with( $public_identifier, '-//metrius//dtd metrius presentational//' ) || 299 str_starts_with( $public_identifier, '-//microsoft//dtd internet explorer 2.0 html strict//' ) || 300 str_starts_with( $public_identifier, '-//microsoft//dtd internet explorer 2.0 html//' ) || 301 str_starts_with( $public_identifier, '-//microsoft//dtd internet explorer 2.0 tables//' ) || 302 str_starts_with( $public_identifier, '-//microsoft//dtd internet explorer 3.0 html strict//' ) || 303 str_starts_with( $public_identifier, '-//microsoft//dtd internet explorer 3.0 html//' ) || 304 str_starts_with( $public_identifier, '-//microsoft//dtd internet explorer 3.0 tables//' ) || 305 str_starts_with( $public_identifier, '-//netscape comm. corp.//dtd html//' ) || 306 str_starts_with( $public_identifier, '-//netscape comm. corp.//dtd strict html//' ) || 307 str_starts_with( $public_identifier, "-//o'reilly and associates//dtd html 2.0//" ) || 308 str_starts_with( $public_identifier, "-//o'reilly and associates//dtd html extended 1.0//" ) || 309 str_starts_with( $public_identifier, "-//o'reilly and associates//dtd html extended relaxed 1.0//" ) || 310 str_starts_with( $public_identifier, '-//sq//dtd html 2.0 hotmetal + extensions//' ) || 311 str_starts_with( $public_identifier, '-//softquad software//dtd hotmetal pro 6.0::19990601::extensions to html 4.0//' ) || 312 str_starts_with( $public_identifier, '-//softquad//dtd hotmetal pro 4.0::19971010::extensions to html 4.0//' ) || 313 str_starts_with( $public_identifier, '-//spyglass//dtd html 2.0 extended//' ) || 314 str_starts_with( $public_identifier, '-//sun microsystems corp.//dtd hotjava html//' ) || 315 str_starts_with( $public_identifier, '-//sun microsystems corp.//dtd hotjava strict html//' ) || 316 str_starts_with( $public_identifier, '-//w3c//dtd html 3 1995-03-24//' ) || 317 str_starts_with( $public_identifier, '-//w3c//dtd html 3.2 draft//' ) || 318 str_starts_with( $public_identifier, '-//w3c//dtd html 3.2 final//' ) || 319 str_starts_with( $public_identifier, '-//w3c//dtd html 3.2//' ) || 320 str_starts_with( $public_identifier, '-//w3c//dtd html 3.2s draft//' ) || 321 str_starts_with( $public_identifier, '-//w3c//dtd html 4.0 frameset//' ) || 322 str_starts_with( $public_identifier, '-//w3c//dtd html 4.0 transitional//' ) || 323 str_starts_with( $public_identifier, '-//w3c//dtd html experimental 19960712//' ) || 324 str_starts_with( $public_identifier, '-//w3c//dtd html experimental 970421//' ) || 325 str_starts_with( $public_identifier, '-//w3c//dtd w3 html//' ) || 326 str_starts_with( $public_identifier, '-//w3o//dtd w3 html 3.0//' ) || 327 str_starts_with( $public_identifier, '-//webtechs//dtd mozilla html 2.0//' ) || 328 str_starts_with( $public_identifier, '-//webtechs//dtd mozilla html//' ) 329 ) { 330 $this->indicated_compatability_mode = 'quirks'; 331 return; 332 } 333 334 /* 335 * > The system identifier is missing and the public identifier starts with… 336 */ 337 if ( 338 $system_identifier_is_missing && ( 339 str_starts_with( $public_identifier, '-//w3c//dtd html 4.01 frameset//' ) || 340 str_starts_with( $public_identifier, '-//w3c//dtd html 4.01 transitional//' ) 341 ) 342 ) { 343 $this->indicated_compatability_mode = 'quirks'; 344 return; 345 } 346 347 /* 348 * > Otherwise, if the DOCTYPE token matches one of the conditions in 349 * > the following list, then set the Document to limited-quirks mode. 350 */ 351 352 /* 353 * > The public identifier starts with… 354 */ 355 if ( 356 str_starts_with( $public_identifier, '-//w3c//dtd xhtml 1.0 frameset//' ) || 357 str_starts_with( $public_identifier, '-//w3c//dtd xhtml 1.0 transitional//' ) 358 ) { 359 $this->indicated_compatability_mode = 'limited-quirks'; 360 return; 361 } 362 363 /* 364 * > The system identifier is not missing and the public identifier starts with… 365 */ 366 if ( 367 ! $system_identifier_is_missing && ( 368 str_starts_with( $public_identifier, '-//w3c//dtd html 4.01 frameset//' ) || 369 str_starts_with( $public_identifier, '-//w3c//dtd html 4.01 transitional//' ) 370 ) 371 ) { 372 $this->indicated_compatability_mode = 'limited-quirks'; 373 return; 374 } 375 376 $this->indicated_compatability_mode = 'no-quirks'; 377 } 378 379 /** 380 * Creates a WP_HTML_Doctype_Info instance by parsing a raw DOCTYPE declaration token. 381 * 382 * Use this method to parse a DOCTYPE declaration token and get access to its properties 383 * via the returned WP_HTML_Doctype_Info class instance. The provided input must parse 384 * properly as a DOCTYPE declaration, though it must not represent a valid DOCTYPE. 385 * 386 * Example: 387 * 388 * // Normative HTML DOCTYPE declaration. 389 * $doctype = WP_HTML_Doctype_Info::from_doctype_token( '<!DOCTYPE html>' ); 390 * 'no-quirks' === $doctype->indicated_compatability_mode; 391 * 392 * // A nonsensical DOCTYPE is still valid, and will indicate "quirks" mode. 393 * $doctype = WP_HTML_Doctype_Info::from_doctype_token( '<!doctypeJSON SILLY "nonsense\'>' ); 394 * 'quirks' === $doctype->indicated_compatability_mode; 395 * 396 * // Textual quirks present in raw HTML are handled appropriately. 397 * $doctype = WP_HTML_Doctype_Info::from_doctype_token( "<!DOCTYPE\nhtml\n>" ); 398 * 'no-quirks' === $doctype->indicated_compatability_mode; 399 * 400 * // Anything other than a proper DOCTYPE declaration token fails to parse. 401 * null === WP_HTML_Doctype_Info::from_doctype_token( ' <!DOCTYPE>' ); 402 * null === WP_HTML_Doctype_Info::from_doctype_token( '<!DOCTYPE ><p>' ); 403 * null === WP_HTML_Doctype_Info::from_doctype_token( '<!TYPEDOC>' ); 404 * null === WP_HTML_Doctype_Info::from_doctype_token( 'html' ); 405 * null === WP_HTML_Doctype_Info::from_doctype_token( '<?xml version="1.0" encoding="UTF-8" ?>' ); 406 * 407 * @since 6.7.0 408 * 409 * @param string $doctype_html The complete raw DOCTYPE HTML string, e.g. `<!DOCTYPE html>`. 410 * 411 * @return WP_HTML_Doctype_Info|null A WP_HTML_Doctype_Info instance will be returned if the 412 * provided DOCTYPE HTML is a valid DOCTYPE. Otherwise, null. 413 */ 414 public static function from_doctype_token( string $doctype_html ): ?self { 415 $doctype_name = null; 416 $doctype_public_id = null; 417 $doctype_system_id = null; 418 419 $end = strlen( $doctype_html ) - 1; 420 421 /* 422 * This parser combines the rules for parsing DOCTYPE tokens found in the HTML 423 * specification for the DOCTYPE related tokenizer states. 424 * 425 * @see https://html.spec.whatwg.org/#doctype-state 426 */ 427 428 /* 429 * - Valid DOCTYPE HTML token must be at least `<!DOCTYPE>` assuming a complete token not 430 * ending in end-of-file. 431 * - It must start with an ASCII case-insensitive match for `<!DOCTYPE`. 432 * - The only occurrence of `>` must be the final byte in the HTML string. 433 */ 434 if ( 435 $end < 9 || 436 0 !== substr_compare( $doctype_html, '<!DOCTYPE', 0, 9, true ) 437 ) { 438 return null; 439 } 440 441 $at = 9; 442 // Is there one and only one `>`? 443 if ( '>' !== $doctype_html[ $end ] || ( strcspn( $doctype_html, '>', $at ) + $at ) < $end ) { 444 return null; 445 } 446 447 /* 448 * Perform newline normalization and ensure the $end value is correct after normalization. 449 * 450 * @see https://html.spec.whatwg.org/#preprocessing-the-input-stream 451 * @see https://infra.spec.whatwg.org/#normalize-newlines 452 */ 453 $doctype_html = str_replace( "\r\n", "\n", $doctype_html ); 454 $doctype_html = str_replace( "\r", "\n", $doctype_html ); 455 $end = strlen( $doctype_html ) - 1; 456 457 /* 458 * In this state, the doctype token has been found and its "content" optionally including the 459 * name, public identifier, and system identifier is between the current position and the end. 460 * 461 * "<!DOCTYPE...declaration...>" 462 * ╰─ $at ╰─ $end 463 * 464 * It's also possible that the declaration part is empty. 465 * 466 * ╭─ $at 467 * "<!DOCTYPE>" 468 * ╰─ $end 469 * 470 * Rules for parsing ">" which terminates the DOCTYPE do not need to be considered as they 471 * have been handled above in the condition that the provided DOCTYPE HTML must contain 472 * exactly one ">" character in the final position. 473 */ 474 475 /* 476 * 477 * Parsing effectively begins in "Before DOCTYPE name state". Ignore whitespace and 478 * proceed to the next state. 479 * 480 * @see https://html.spec.whatwg.org/#before-doctype-name-state 481 */ 482 $at += strspn( $doctype_html, " \t\n\f\r", $at ); 483 484 if ( $at >= $end ) { 485 return new self( $doctype_name, $doctype_public_id, $doctype_system_id, true ); 486 } 487 488 $name_length = strcspn( $doctype_html, " \t\n\f\r", $at, $end - $at ); 489 $doctype_name = str_replace( "\0", "\u{FFFD}", strtolower( substr( $doctype_html, $at, $name_length ) ) ); 490 491 $at += $name_length; 492 $at += strspn( $doctype_html, " \t\n\f\r", $at, $end - $at ); 493 if ( $at >= $end ) { 494 return new self( $doctype_name, $doctype_public_id, $doctype_system_id, false ); 495 } 496 497 /* 498 * "After DOCTYPE name state" 499 * 500 * Find a case-insensitive match for "PUBLIC" or "SYSTEM" at this point. 501 * Otherwise, set force-quirks and enter bogus DOCTYPE state (skip the rest of the doctype). 502 * 503 * @see https://html.spec.whatwg.org/#after-doctype-name-state 504 */ 505 if ( $at + 6 >= $end ) { 506 return new self( $doctype_name, $doctype_public_id, $doctype_system_id, true ); 507 } 508 509 /* 510 * > If the six characters starting from the current input character are an ASCII 511 * > case-insensitive match for the word "PUBLIC", then consume those characters 512 * > and switch to the after DOCTYPE public keyword state. 513 */ 514 if ( 0 === substr_compare( $doctype_html, 'PUBLIC', $at, 6, true ) ) { 515 $at += 6; 516 $at += strspn( $doctype_html, " \t\n\f\r", $at, $end - $at ); 517 if ( $at >= $end ) { 518 return new self( $doctype_name, $doctype_public_id, $doctype_system_id, true ); 519 } 520 goto parse_doctype_public_identifier; 521 } 522 523 /* 524 * > Otherwise, if the six characters starting from the current input character are an ASCII 525 * > case-insensitive match for the word "SYSTEM", then consume those characters and switch 526 * > to the after DOCTYPE system keyword state. 527 */ 528 if ( 0 === substr_compare( $doctype_html, 'SYSTEM', $at, 6, true ) ) { 529 $at += 6; 530 $at += strspn( $doctype_html, " \t\n\f\r", $at, $end - $at ); 531 if ( $at >= $end ) { 532 return new self( $doctype_name, $doctype_public_id, $doctype_system_id, true ); 533 } 534 goto parse_doctype_system_identifier; 535 } 536 537 /* 538 * > Otherwise, this is an invalid-character-sequence-after-doctype-name parse error. 539 * > Set the current DOCTYPE token's force-quirks flag to on. Reconsume in the bogus 540 * > DOCTYPE state. 541 */ 542 return new self( $doctype_name, $doctype_public_id, $doctype_system_id, true ); 543 544 parse_doctype_public_identifier: 545 /* 546 * The parser should enter "DOCTYPE public identifier (double-quoted) state" or 547 * "DOCTYPE public identifier (single-quoted) state" by finding one of the valid quotes. 548 * Anything else forces quirks mode and ignores the rest of the contents. 549 * 550 * @see https://html.spec.whatwg.org/#doctype-public-identifier-(double-quoted)-state 551 * @see https://html.spec.whatwg.org/#doctype-public-identifier-(single-quoted)-state 552 */ 553 $closer_quote = $doctype_html[ $at ]; 554 555 /* 556 * > This is a missing-quote-before-doctype-public-identifier parse error. Set the 557 * > current DOCTYPE token's force-quirks flag to on. Reconsume in the bogus DOCTYPE state. 558 */ 559 if ( '"' !== $closer_quote && "'" !== $closer_quote ) { 560 return new self( $doctype_name, $doctype_public_id, $doctype_system_id, true ); 561 } 562 563 ++$at; 564 565 $identifier_length = strcspn( $doctype_html, $closer_quote, $at, $end - $at ); 566 $doctype_public_id = str_replace( "\0", "\u{FFFD}", substr( $doctype_html, $at, $identifier_length ) ); 567 568 $at += $identifier_length; 569 if ( $at >= $end || $closer_quote !== $doctype_html[ $at ] ) { 570 return new self( $doctype_name, $doctype_public_id, $doctype_system_id, true ); 571 } 572 573 ++$at; 574 575 /* 576 * "Between DOCTYPE public and system identifiers state" 577 * 578 * Advance through whitespace between public and system identifiers. 579 * 580 * @see https://html.spec.whatwg.org/#between-doctype-public-and-system-identifiers-state 581 */ 582 $at += strspn( $doctype_html, " \t\n\f\r", $at, $end - $at ); 583 if ( $at >= $end ) { 584 return new self( $doctype_name, $doctype_public_id, $doctype_system_id, false ); 585 } 586 587 parse_doctype_system_identifier: 588 /* 589 * The parser should enter "DOCTYPE system identifier (double-quoted) state" or 590 * "DOCTYPE system identifier (single-quoted) state" by finding one of the valid quotes. 591 * Anything else forces quirks mode and ignores the rest of the contents. 592 * 593 * @see https://html.spec.whatwg.org/#doctype-system-identifier-(double-quoted)-state 594 * @see https://html.spec.whatwg.org/#doctype-system-identifier-(single-quoted)-state 595 */ 596 $closer_quote = $doctype_html[ $at ]; 597 598 /* 599 * > This is a missing-quote-before-doctype-system-identifier parse error. Set the 600 * > current DOCTYPE token's force-quirks flag to on. Reconsume in the bogus DOCTYPE state. 601 */ 602 if ( '"' !== $closer_quote && "'" !== $closer_quote ) { 603 return new self( $doctype_name, $doctype_public_id, $doctype_system_id, true ); 604 } 605 606 ++$at; 607 608 $identifier_length = strcspn( $doctype_html, $closer_quote, $at, $end - $at ); 609 $doctype_system_id = str_replace( "\0", "\u{FFFD}", substr( $doctype_html, $at, $identifier_length ) ); 610 611 $at += $identifier_length; 612 if ( $at >= $end || $closer_quote !== $doctype_html[ $at ] ) { 613 return new self( $doctype_name, $doctype_public_id, $doctype_system_id, true ); 614 } 615 616 return new self( $doctype_name, $doctype_public_id, $doctype_system_id, false ); 617 } 618 }
title
Description
Body
title
Description
Body
title
Description
Body
title
Body
| Generated : Wed Aug 13 08:20:01 2025 | Cross-referenced by PHPXref |