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