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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 * @since 7.1.0 Spec update: missing and empty SYSTEM identifiers are handled 53 * the same for determining the document mode. 54 * 55 * @access private 56 * 57 * @see WP_HTML_Processor 58 */ 59 class WP_HTML_Doctype_Info { 60 /** 61 * Name of the DOCTYPE: should be "html" for HTML documents. 62 * 63 * This value should be considered "read only" and not modified. 64 * 65 * Historically the DOCTYPE name indicates name of the document's root element. 66 * 67 * <!DOCTYPE html> 68 * ╰──┴── name is "html". 69 * 70 * @see https://html.spec.whatwg.org/#tokenization 71 * 72 * @since 6.7.0 73 * 74 * @var string|null 75 */ 76 public $name = null; 77 78 /** 79 * Public identifier of the DOCTYPE. 80 * 81 * This value should be considered "read only" and not modified. 82 * 83 * The public identifier is optional and should not appear in HTML documents. 84 * A `null` value indicates that no public identifier was present in the DOCTYPE. 85 * 86 * Historically the presence of the public identifier indicated that a document 87 * was meant to be shared between computer systems and the value indicated to a 88 * knowledgeable parser how to find the relevant document type definition (DTD). 89 * 90 * <!DOCTYPE html PUBLIC "public id goes here in quotes"> 91 * │ │ ╰─── public identifier ─────╯ 92 * ╰──┴── name is "html". 93 * 94 * @see https://html.spec.whatwg.org/#tokenization 95 * 96 * @since 6.7.0 97 * 98 * @var string|null 99 */ 100 public $public_identifier = null; 101 102 /** 103 * System identifier of the DOCTYPE. 104 * 105 * This value should be considered "read only" and not modified. 106 * 107 * The system identifier is optional and should not appear in HTML documents. 108 * A `null` value indicates that no system identifier was present in the DOCTYPE. 109 * 110 * Historically the system identifier specified where a relevant document type 111 * declaration for the given document is stored and may be retrieved. 112 * 113 * <!DOCTYPE html SYSTEM "system id goes here in quotes"> 114 * │ │ ╰──── system identifier ────╯ 115 * ╰──┴── name is "html". 116 * 117 * If a public identifier were provided it would indicate to a knowledgeable 118 * parser how to interpret the system identifier. 119 * 120 * <!DOCTYPE html PUBLIC "public id goes here in quotes" "system id goes here in quotes"> 121 * │ │ ╰─── public identifier ─────╯ ╰──── system identifier ────╯ 122 * ╰──┴── name is "html". 123 * 124 * @see https://html.spec.whatwg.org/#tokenization 125 * 126 * @since 6.7.0 127 * 128 * @var string|null 129 */ 130 public $system_identifier = null; 131 132 /** 133 * Which document compatibility mode this DOCTYPE declaration indicates. 134 * 135 * This value should be considered "read only" and not modified. 136 * 137 * When an HTML parser has not already set the document compatibility mode, 138 * (e.g. "quirks" or "no-quirks" mode), it will be inferred from the properties 139 * of the appropriate DOCTYPE declaration, if one exists. The DOCTYPE can 140 * indicate one of three possible document compatibility modes: 141 * "no-quirks", "limited-quirks", or "quirks". 142 * 143 * Browsers expose the resulting document mode via `document.compatMode`: 144 * - "BackCompat" indicates "quirks" mode. 145 * - "CSS1Compat" indicates "no-quirks" or "limited-quirks" (these modes are not 146 * distinguished by `document.compatMode`). 147 * 148 * An appropriate DOCTYPE is one encountered in the "initial" insertion mode, 149 * before the HTML element has been opened and before finding any other 150 * DOCTYPE declaration tokens. 151 * 152 * @see https://html.spec.whatwg.org/#the-initial-insertion-mode 153 * 154 * @since 6.7.0 155 * 156 * @var string One of "no-quirks", "limited-quirks", or "quirks". 157 */ 158 public $indicated_compatibility_mode; 159 160 /** 161 * Constructor. 162 * 163 * This class should not be instantiated directly. 164 * Use the static {@see self::from_doctype_token} method instead. 165 * 166 * The arguments to this constructor correspond to the "DOCTYPE token" 167 * as defined in the HTML specification. 168 * 169 * > DOCTYPE tokens have a name, a public identifier, a system identifier, 170 * > and a force-quirks flag. When a DOCTYPE token is created, its name, public identifier, 171 * > and system identifier must be marked as missing (which is a distinct state from the 172 * > empty string), and the force-quirks flag must be set to off (its other state is on). 173 * 174 * @see https://html.spec.whatwg.org/multipage/parsing.html#tokenization 175 * 176 * @since 6.7.0 177 * 178 * @param string|null $name Name of the DOCTYPE. 179 * @param string|null $public_identifier Public identifier of the DOCTYPE. 180 * @param string|null $system_identifier System identifier of the DOCTYPE. 181 * @param bool $force_quirks_flag Whether the force-quirks flag is set for the token. 182 */ 183 private function __construct( 184 ?string $name, 185 ?string $public_identifier, 186 ?string $system_identifier, 187 bool $force_quirks_flag 188 ) { 189 $this->name = $name; 190 $this->public_identifier = $public_identifier; 191 $this->system_identifier = $system_identifier; 192 193 /* 194 * > If the DOCTYPE token matches one of the conditions in the following list, 195 * > then set the Document to quirks mode: 196 */ 197 198 /* 199 * > The force-quirks flag is set to on. 200 */ 201 if ( $force_quirks_flag ) { 202 $this->indicated_compatibility_mode = 'quirks'; 203 return; 204 } 205 206 /* 207 * Normative documents will contain the literal `<!DOCTYPE html>` with no 208 * public or system identifiers; short-circuit to avoid extra parsing. 209 */ 210 if ( 'html' === $name && null === $public_identifier && null === $system_identifier ) { 211 $this->indicated_compatibility_mode = 'no-quirks'; 212 return; 213 } 214 215 /* 216 * > The name is not "html". 217 * 218 * The tokenizer must report the name in lower case even if provided in 219 * the document in upper case; thus no conversion is required here. 220 */ 221 if ( 'html' !== $name ) { 222 $this->indicated_compatibility_mode = 'quirks'; 223 return; 224 } 225 226 /* 227 * Set up some variables to handle the rest of the conditions. 228 * 229 * > set...the public identifier...to...the empty string if the public identifier was missing. 230 * > set...the system identifier...to...the empty string if the system identifier was missing. 231 * > 232 * > The system identifier and public identifier strings must be compared... 233 * > in an ASCII case-insensitive manner. 234 */ 235 $public_identifier = null === $public_identifier ? '' : strtolower( $public_identifier ); 236 $system_identifier = null === $system_identifier ? '' : strtolower( $system_identifier ); 237 238 /* 239 * > The public identifier is set to… 240 */ 241 if ( 242 '-//w3o//dtd w3 html strict 3.0//en//' === $public_identifier || 243 '-/w3c/dtd html 4.0 transitional/en' === $public_identifier || 244 'html' === $public_identifier 245 ) { 246 $this->indicated_compatibility_mode = 'quirks'; 247 return; 248 } 249 250 /* 251 * > The system identifier is set to… 252 */ 253 if ( 'http://www.ibm.com/data/dtd/v11/ibmxhtml1-transitional.dtd' === $system_identifier ) { 254 $this->indicated_compatibility_mode = 'quirks'; 255 return; 256 } 257 258 /* 259 * All of the following conditions depend on matching the public identifier. 260 * If the public identifier is empty, none of the following conditions will match. 261 */ 262 if ( '' === $public_identifier ) { 263 $this->indicated_compatibility_mode = 'no-quirks'; 264 return; 265 } 266 267 /* 268 * > The public identifier starts with… 269 * 270 * @todo Optimize this matching. It shouldn't be a large overall performance issue, 271 * however, as only a single DOCTYPE declaration token should ever be parsed, 272 * and normative documents will have exited before reaching this condition. 273 */ 274 if ( 275 str_starts_with( $public_identifier, '+//silmaril//dtd html pro v0r11 19970101//' ) || 276 str_starts_with( $public_identifier, '-//as//dtd html 3.0 aswedit + extensions//' ) || 277 str_starts_with( $public_identifier, '-//advasoft ltd//dtd html 3.0 aswedit + extensions//' ) || 278 str_starts_with( $public_identifier, '-//ietf//dtd html 2.0 level 1//' ) || 279 str_starts_with( $public_identifier, '-//ietf//dtd html 2.0 level 2//' ) || 280 str_starts_with( $public_identifier, '-//ietf//dtd html 2.0 strict level 1//' ) || 281 str_starts_with( $public_identifier, '-//ietf//dtd html 2.0 strict level 2//' ) || 282 str_starts_with( $public_identifier, '-//ietf//dtd html 2.0 strict//' ) || 283 str_starts_with( $public_identifier, '-//ietf//dtd html 2.0//' ) || 284 str_starts_with( $public_identifier, '-//ietf//dtd html 2.1e//' ) || 285 str_starts_with( $public_identifier, '-//ietf//dtd html 3.0//' ) || 286 str_starts_with( $public_identifier, '-//ietf//dtd html 3.2 final//' ) || 287 str_starts_with( $public_identifier, '-//ietf//dtd html 3.2//' ) || 288 str_starts_with( $public_identifier, '-//ietf//dtd html 3//' ) || 289 str_starts_with( $public_identifier, '-//ietf//dtd html level 0//' ) || 290 str_starts_with( $public_identifier, '-//ietf//dtd html level 1//' ) || 291 str_starts_with( $public_identifier, '-//ietf//dtd html level 2//' ) || 292 str_starts_with( $public_identifier, '-//ietf//dtd html level 3//' ) || 293 str_starts_with( $public_identifier, '-//ietf//dtd html strict level 0//' ) || 294 str_starts_with( $public_identifier, '-//ietf//dtd html strict level 1//' ) || 295 str_starts_with( $public_identifier, '-//ietf//dtd html strict level 2//' ) || 296 str_starts_with( $public_identifier, '-//ietf//dtd html strict level 3//' ) || 297 str_starts_with( $public_identifier, '-//ietf//dtd html strict//' ) || 298 str_starts_with( $public_identifier, '-//ietf//dtd html//' ) || 299 str_starts_with( $public_identifier, '-//metrius//dtd metrius presentational//' ) || 300 str_starts_with( $public_identifier, '-//microsoft//dtd internet explorer 2.0 html strict//' ) || 301 str_starts_with( $public_identifier, '-//microsoft//dtd internet explorer 2.0 html//' ) || 302 str_starts_with( $public_identifier, '-//microsoft//dtd internet explorer 2.0 tables//' ) || 303 str_starts_with( $public_identifier, '-//microsoft//dtd internet explorer 3.0 html strict//' ) || 304 str_starts_with( $public_identifier, '-//microsoft//dtd internet explorer 3.0 html//' ) || 305 str_starts_with( $public_identifier, '-//microsoft//dtd internet explorer 3.0 tables//' ) || 306 str_starts_with( $public_identifier, '-//netscape comm. corp.//dtd html//' ) || 307 str_starts_with( $public_identifier, '-//netscape comm. corp.//dtd strict html//' ) || 308 str_starts_with( $public_identifier, "-//o'reilly and associates//dtd html 2.0//" ) || 309 str_starts_with( $public_identifier, "-//o'reilly and associates//dtd html extended 1.0//" ) || 310 str_starts_with( $public_identifier, "-//o'reilly and associates//dtd html extended relaxed 1.0//" ) || 311 str_starts_with( $public_identifier, '-//sq//dtd html 2.0 hotmetal + extensions//' ) || 312 str_starts_with( $public_identifier, '-//softquad software//dtd hotmetal pro 6.0::19990601::extensions to html 4.0//' ) || 313 str_starts_with( $public_identifier, '-//softquad//dtd hotmetal pro 4.0::19971010::extensions to html 4.0//' ) || 314 str_starts_with( $public_identifier, '-//spyglass//dtd html 2.0 extended//' ) || 315 str_starts_with( $public_identifier, '-//sun microsystems corp.//dtd hotjava html//' ) || 316 str_starts_with( $public_identifier, '-//sun microsystems corp.//dtd hotjava strict html//' ) || 317 str_starts_with( $public_identifier, '-//w3c//dtd html 3 1995-03-24//' ) || 318 str_starts_with( $public_identifier, '-//w3c//dtd html 3.2 draft//' ) || 319 str_starts_with( $public_identifier, '-//w3c//dtd html 3.2 final//' ) || 320 str_starts_with( $public_identifier, '-//w3c//dtd html 3.2//' ) || 321 str_starts_with( $public_identifier, '-//w3c//dtd html 3.2s draft//' ) || 322 str_starts_with( $public_identifier, '-//w3c//dtd html 4.0 frameset//' ) || 323 str_starts_with( $public_identifier, '-//w3c//dtd html 4.0 transitional//' ) || 324 str_starts_with( $public_identifier, '-//w3c//dtd html experimental 19960712//' ) || 325 str_starts_with( $public_identifier, '-//w3c//dtd html experimental 970421//' ) || 326 str_starts_with( $public_identifier, '-//w3c//dtd w3 html//' ) || 327 str_starts_with( $public_identifier, '-//w3o//dtd w3 html 3.0//' ) || 328 str_starts_with( $public_identifier, '-//webtechs//dtd mozilla html 2.0//' ) || 329 str_starts_with( $public_identifier, '-//webtechs//dtd mozilla html//' ) 330 ) { 331 $this->indicated_compatibility_mode = 'quirks'; 332 return; 333 } 334 335 /* 336 * > The system identifier is missing or the empty string, and the 337 * > public identifier starts with… 338 */ 339 if ( 340 '' === $system_identifier && ( 341 str_starts_with( $public_identifier, '-//w3c//dtd html 4.01 frameset//' ) || 342 str_starts_with( $public_identifier, '-//w3c//dtd html 4.01 transitional//' ) 343 ) 344 ) { 345 $this->indicated_compatibility_mode = 'quirks'; 346 return; 347 } 348 349 /* 350 * > Otherwise, if the DOCTYPE token matches one of the conditions in 351 * > the following list, then set the Document to limited-quirks mode. 352 */ 353 354 /* 355 * > The public identifier starts with… 356 */ 357 if ( 358 str_starts_with( $public_identifier, '-//w3c//dtd xhtml 1.0 frameset//' ) || 359 str_starts_with( $public_identifier, '-//w3c//dtd xhtml 1.0 transitional//' ) 360 ) { 361 $this->indicated_compatibility_mode = 'limited-quirks'; 362 return; 363 } 364 365 /* 366 * > The system identifier is neither missing nor the empty string, and the 367 * > public identifier starts with… 368 */ 369 if ( 370 '' !== $system_identifier && ( 371 str_starts_with( $public_identifier, '-//w3c//dtd html 4.01 frameset//' ) || 372 str_starts_with( $public_identifier, '-//w3c//dtd html 4.01 transitional//' ) 373 ) 374 ) { 375 $this->indicated_compatibility_mode = 'limited-quirks'; 376 return; 377 } 378 379 $this->indicated_compatibility_mode = 'no-quirks'; 380 } 381 382 /** 383 * Creates a WP_HTML_Doctype_Info instance by parsing a raw DOCTYPE declaration token. 384 * 385 * Use this method to parse a DOCTYPE declaration token and get access to its properties 386 * via the returned WP_HTML_Doctype_Info class instance. The provided input must parse 387 * properly as a DOCTYPE declaration, though it must not represent a valid DOCTYPE. 388 * 389 * Example: 390 * 391 * // Normative HTML DOCTYPE declaration. 392 * $doctype = WP_HTML_Doctype_Info::from_doctype_token( '<!DOCTYPE html>' ); 393 * 'no-quirks' === $doctype->indicated_compatibility_mode; 394 * 395 * // A nonsensical DOCTYPE is still valid, and will indicate "quirks" mode. 396 * $doctype = WP_HTML_Doctype_Info::from_doctype_token( '<!doctypeJSON SILLY "nonsense\'>' ); 397 * 'quirks' === $doctype->indicated_compatibility_mode; 398 * 399 * // Textual quirks present in raw HTML are handled appropriately. 400 * $doctype = WP_HTML_Doctype_Info::from_doctype_token( "<!DOCTYPE\nhtml\n>" ); 401 * 'no-quirks' === $doctype->indicated_compatibility_mode; 402 * 403 * // Anything other than a proper DOCTYPE declaration token fails to parse. 404 * null === WP_HTML_Doctype_Info::from_doctype_token( ' <!DOCTYPE>' ); 405 * null === WP_HTML_Doctype_Info::from_doctype_token( '<!DOCTYPE ><p>' ); 406 * null === WP_HTML_Doctype_Info::from_doctype_token( '<!TYPEDOC>' ); 407 * null === WP_HTML_Doctype_Info::from_doctype_token( 'html' ); 408 * null === WP_HTML_Doctype_Info::from_doctype_token( '<?xml version="1.0" encoding="UTF-8" ?>' ); 409 * 410 * @since 6.7.0 411 * 412 * @param string $doctype_html The complete raw DOCTYPE HTML string, e.g. `<!DOCTYPE html>`. 413 * 414 * @return WP_HTML_Doctype_Info|null A WP_HTML_Doctype_Info instance will be returned if the 415 * provided DOCTYPE HTML is a valid DOCTYPE. Otherwise, null. 416 */ 417 public static function from_doctype_token( string $doctype_html ): ?self { 418 $doctype_name = null; 419 $doctype_public_id = null; 420 $doctype_system_id = null; 421 422 $end = strlen( $doctype_html ) - 1; 423 424 /* 425 * This parser combines the rules for parsing DOCTYPE tokens found in the HTML 426 * specification for the DOCTYPE related tokenizer states. 427 * 428 * @see https://html.spec.whatwg.org/#doctype-state 429 */ 430 431 /* 432 * - Valid DOCTYPE HTML token must be at least `<!DOCTYPE>` assuming a complete token not 433 * ending in end-of-file. 434 * - It must start with an ASCII case-insensitive match for `<!DOCTYPE`. 435 * - The only occurrence of `>` must be the final byte in the HTML string. 436 */ 437 if ( 438 $end < 9 || 439 0 !== substr_compare( $doctype_html, '<!DOCTYPE', 0, 9, true ) 440 ) { 441 return null; 442 } 443 444 $at = 9; 445 // Is there one and only one `>`? 446 if ( '>' !== $doctype_html[ $end ] || ( strcspn( $doctype_html, '>', $at ) + $at ) < $end ) { 447 return null; 448 } 449 450 /* 451 * Perform newline normalization and ensure the $end value is correct after normalization. 452 * 453 * @see https://html.spec.whatwg.org/#preprocessing-the-input-stream 454 * @see https://infra.spec.whatwg.org/#normalize-newlines 455 */ 456 $doctype_html = str_replace( "\r\n", "\n", $doctype_html ); 457 $doctype_html = str_replace( "\r", "\n", $doctype_html ); 458 $end = strlen( $doctype_html ) - 1; 459 460 /* 461 * In this state, the doctype token has been found and its "content" optionally including the 462 * name, public identifier, and system identifier is between the current position and the end. 463 * 464 * "<!DOCTYPE...declaration...>" 465 * ╰─ $at ╰─ $end 466 * 467 * It's also possible that the declaration part is empty. 468 * 469 * ╭─ $at 470 * "<!DOCTYPE>" 471 * ╰─ $end 472 * 473 * Rules for parsing ">" which terminates the DOCTYPE do not need to be considered as they 474 * have been handled above in the condition that the provided DOCTYPE HTML must contain 475 * exactly one ">" character in the final position. 476 */ 477 478 /* 479 * 480 * Parsing effectively begins in "Before DOCTYPE name state". Ignore whitespace and 481 * proceed to the next state. 482 * 483 * @see https://html.spec.whatwg.org/#before-doctype-name-state 484 */ 485 $at += strspn( $doctype_html, " \t\n\f\r", $at ); 486 487 if ( $at >= $end ) { 488 return new self( $doctype_name, $doctype_public_id, $doctype_system_id, true ); 489 } 490 491 $name_length = strcspn( $doctype_html, " \t\n\f\r", $at, $end - $at ); 492 $doctype_name = str_replace( "\0", "\u{FFFD}", strtolower( substr( $doctype_html, $at, $name_length ) ) ); 493 494 $at += $name_length; 495 $at += strspn( $doctype_html, " \t\n\f\r", $at, $end - $at ); 496 if ( $at >= $end ) { 497 return new self( $doctype_name, $doctype_public_id, $doctype_system_id, false ); 498 } 499 500 /* 501 * "After DOCTYPE name state" 502 * 503 * Find a case-insensitive match for "PUBLIC" or "SYSTEM" at this point. 504 * Otherwise, set force-quirks and enter bogus DOCTYPE state (skip the rest of the doctype). 505 * 506 * @see https://html.spec.whatwg.org/#after-doctype-name-state 507 */ 508 if ( $at + 6 >= $end ) { 509 return new self( $doctype_name, $doctype_public_id, $doctype_system_id, true ); 510 } 511 512 /* 513 * > If the six characters starting from the current input character are an ASCII 514 * > case-insensitive match for the word "PUBLIC", then consume those characters 515 * > and switch to the after DOCTYPE public keyword state. 516 */ 517 if ( 0 === substr_compare( $doctype_html, 'PUBLIC', $at, 6, true ) ) { 518 $at += 6; 519 $at += strspn( $doctype_html, " \t\n\f\r", $at, $end - $at ); 520 if ( $at >= $end ) { 521 return new self( $doctype_name, $doctype_public_id, $doctype_system_id, true ); 522 } 523 goto parse_doctype_public_identifier; 524 } 525 526 /* 527 * > Otherwise, if the six characters starting from the current input character are an ASCII 528 * > case-insensitive match for the word "SYSTEM", then consume those characters and switch 529 * > to the after DOCTYPE system keyword state. 530 */ 531 if ( 0 === substr_compare( $doctype_html, 'SYSTEM', $at, 6, true ) ) { 532 $at += 6; 533 $at += strspn( $doctype_html, " \t\n\f\r", $at, $end - $at ); 534 if ( $at >= $end ) { 535 return new self( $doctype_name, $doctype_public_id, $doctype_system_id, true ); 536 } 537 goto parse_doctype_system_identifier; 538 } 539 540 /* 541 * > Otherwise, this is an invalid-character-sequence-after-doctype-name parse error. 542 * > Set the current DOCTYPE token's force-quirks flag to on. Reconsume in the bogus 543 * > DOCTYPE state. 544 */ 545 return new self( $doctype_name, $doctype_public_id, $doctype_system_id, true ); 546 547 parse_doctype_public_identifier: 548 /* 549 * The parser should enter "DOCTYPE public identifier (double-quoted) state" or 550 * "DOCTYPE public identifier (single-quoted) state" by finding one of the valid quotes. 551 * Anything else forces quirks mode and ignores the rest of the contents. 552 * 553 * @see https://html.spec.whatwg.org/#doctype-public-identifier-(double-quoted)-state 554 * @see https://html.spec.whatwg.org/#doctype-public-identifier-(single-quoted)-state 555 */ 556 $closer_quote = $doctype_html[ $at ]; 557 558 /* 559 * > This is a missing-quote-before-doctype-public-identifier parse error. Set the 560 * > current DOCTYPE token's force-quirks flag to on. Reconsume in the bogus DOCTYPE state. 561 */ 562 if ( '"' !== $closer_quote && "'" !== $closer_quote ) { 563 return new self( $doctype_name, $doctype_public_id, $doctype_system_id, true ); 564 } 565 566 ++$at; 567 568 $identifier_length = strcspn( $doctype_html, $closer_quote, $at, $end - $at ); 569 $doctype_public_id = str_replace( "\0", "\u{FFFD}", substr( $doctype_html, $at, $identifier_length ) ); 570 571 $at += $identifier_length; 572 if ( $at >= $end || $closer_quote !== $doctype_html[ $at ] ) { 573 return new self( $doctype_name, $doctype_public_id, $doctype_system_id, true ); 574 } 575 576 ++$at; 577 578 /* 579 * "Between DOCTYPE public and system identifiers state" 580 * 581 * Advance through whitespace between public and system identifiers. 582 * 583 * @see https://html.spec.whatwg.org/#between-doctype-public-and-system-identifiers-state 584 */ 585 $at += strspn( $doctype_html, " \t\n\f\r", $at, $end - $at ); 586 if ( $at >= $end ) { 587 return new self( $doctype_name, $doctype_public_id, $doctype_system_id, false ); 588 } 589 590 parse_doctype_system_identifier: 591 /* 592 * The parser should enter "DOCTYPE system identifier (double-quoted) state" or 593 * "DOCTYPE system identifier (single-quoted) state" by finding one of the valid quotes. 594 * Anything else forces quirks mode and ignores the rest of the contents. 595 * 596 * @see https://html.spec.whatwg.org/#doctype-system-identifier-(double-quoted)-state 597 * @see https://html.spec.whatwg.org/#doctype-system-identifier-(single-quoted)-state 598 */ 599 $closer_quote = $doctype_html[ $at ]; 600 601 /* 602 * > This is a missing-quote-before-doctype-system-identifier parse error. Set the 603 * > current DOCTYPE token's force-quirks flag to on. Reconsume in the bogus DOCTYPE state. 604 */ 605 if ( '"' !== $closer_quote && "'" !== $closer_quote ) { 606 return new self( $doctype_name, $doctype_public_id, $doctype_system_id, true ); 607 } 608 609 ++$at; 610 611 $identifier_length = strcspn( $doctype_html, $closer_quote, $at, $end - $at ); 612 $doctype_system_id = str_replace( "\0", "\u{FFFD}", substr( $doctype_html, $at, $identifier_length ) ); 613 614 $at += $identifier_length; 615 if ( $at >= $end || $closer_quote !== $doctype_html[ $at ] ) { 616 return new self( $doctype_name, $doctype_public_id, $doctype_system_id, true ); 617 } 618 619 return new self( $doctype_name, $doctype_public_id, $doctype_system_id, false ); 620 } 621 }
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