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| 1 | <?php |
| 2 | /** |
| 3 | * @file |
| 4 | * @license https://opensource.org/licenses/Apache-2.0 Apache-2.0 |
| 5 | */ |
| 6 | |
| 7 | namespace Wikimedia\CSS\Parser; |
| 8 | |
| 9 | use Wikimedia\CSS\Objects\AtRule; |
| 10 | use Wikimedia\CSS\Objects\ComponentValue; |
| 11 | use Wikimedia\CSS\Objects\ComponentValueList; |
| 12 | use Wikimedia\CSS\Objects\CSSFunction; |
| 13 | use Wikimedia\CSS\Objects\Declaration; |
| 14 | use Wikimedia\CSS\Objects\DeclarationList; |
| 15 | use Wikimedia\CSS\Objects\DeclarationOrAtRuleList; |
| 16 | use Wikimedia\CSS\Objects\QualifiedRule; |
| 17 | use Wikimedia\CSS\Objects\Rule; |
| 18 | use Wikimedia\CSS\Objects\RuleList; |
| 19 | use Wikimedia\CSS\Objects\SimpleBlock; |
| 20 | use Wikimedia\CSS\Objects\Stylesheet; |
| 21 | use Wikimedia\CSS\Objects\Token; |
| 22 | |
| 23 | // Note: While reading the code below, you might find that my calls to |
| 24 | // consumeToken() don't match what the spec says, and I don't ever "reconsume" a |
| 25 | // token. It turns out that the spec is overcomplicated and confused with |
| 26 | // respect to the "current input token" and the "next input token". It turns |
| 27 | // out things are pretty simple: every "consume an X" is called with the |
| 28 | // current input token being the first token of X, and returns with the current |
| 29 | // input token being the last token of X (or EOF if X ends at EOF). |
| 30 | |
| 31 | // Also, of note is that, since our Tokenizer can only return a stream of tokens |
| 32 | // rather than a stream of component values, the consume functions here only |
| 33 | // consider tokens. ComponentValueList::toTokenArray() may be used to convert a |
| 34 | // list of component values to a list of tokens if necessary. |
| 35 | |
| 36 | /** |
| 37 | * Parse CSS into a structure for further processing. |
| 38 | * |
| 39 | * This implements the CSS Syntax Module Level 3 candidate recommendation. |
| 40 | * @see https://www.w3.org/TR/2019/CR-css-syntax-3-20190716/ |
| 41 | * |
| 42 | * The usual entry points are: |
| 43 | * - Parser::parseStylesheet() to parse a stylesheet or the contents of a <style> tag. |
| 44 | * - Parser::parseDeclarationList() to parse an inline style attribute |
| 45 | */ |
| 46 | class Parser { |
| 47 | /** |
| 48 | * Maximum depth of nested ComponentValues |
| 49 | * |
| 50 | * Arbitrary number that seems like it should be enough |
| 51 | */ |
| 52 | private const CV_DEPTH_LIMIT = 100; |
| 53 | |
| 54 | /** @var Tokenizer */ |
| 55 | protected $tokenizer; |
| 56 | |
| 57 | /** @var Token|null The most recently consumed token */ |
| 58 | protected $currentToken = null; |
| 59 | |
| 60 | /** @var array Parse errors. Each error is [ string $tag, int $line, int $pos ] */ |
| 61 | protected $parseErrors = []; |
| 62 | |
| 63 | /** @var int Recursion depth, incremented in self::consumeComponentValue() */ |
| 64 | protected $cvDepth = 0; |
| 65 | |
| 66 | /** |
| 67 | * @param Tokenizer $tokenizer CSS Tokenizer |
| 68 | */ |
| 69 | public function __construct( Tokenizer $tokenizer ) { |
| 70 | $this->tokenizer = $tokenizer; |
| 71 | } |
| 72 | |
| 73 | /** |
| 74 | * Create a Parser for a CSS string |
| 75 | * @param string $source CSS to parse. |
| 76 | * @param array $options Configuration options, see DataSourceTokenizer::__construct(). Also, |
| 77 | * - convert: (array) If specified, detect the encoding as defined in the |
| 78 | * CSS spec. The value is passed as the $encodings argument to |
| 79 | * Encoder::convert(). |
| 80 | * @return static |
| 81 | */ |
| 82 | public static function newFromString( $source, array $options = [] ) { |
| 83 | if ( isset( $options['convert'] ) ) { |
| 84 | $source = Encoder::convert( $source, $options['convert'] ); |
| 85 | } |
| 86 | return static::newFromDataSource( new StringDataSource( $source ), $options ); |
| 87 | } |
| 88 | |
| 89 | /** |
| 90 | * Create a Parser for a CSS DataSource |
| 91 | * @param DataSource $source CSS to parse. |
| 92 | * @param array $options Configuration options, see DataSourceTokenizer::__construct(). |
| 93 | * @return static |
| 94 | */ |
| 95 | public static function newFromDataSource( DataSource $source, array $options = [] ) { |
| 96 | $tokenizer = new DataSourceTokenizer( $source, $options ); |
| 97 | return new static( $tokenizer ); |
| 98 | } |
| 99 | |
| 100 | /** |
| 101 | * Create a Parser for a list of Tokens |
| 102 | * @param Token[] $tokens Token-stream to parse |
| 103 | * @param Token|null $eof EOF-token |
| 104 | * @return static |
| 105 | */ |
| 106 | public static function newFromTokens( array $tokens, ?Token $eof = null ) { |
| 107 | $tokenizer = new TokenListTokenizer( $tokens, $eof ); |
| 108 | return new static( $tokenizer ); |
| 109 | } |
| 110 | |
| 111 | /** |
| 112 | * Consume a token |
| 113 | */ |
| 114 | protected function consumeToken() { |
| 115 | if ( !$this->currentToken || $this->currentToken->type() !== Token::T_EOF ) { |
| 116 | $this->currentToken = $this->tokenizer->consumeToken(); |
| 117 | |
| 118 | // Copy any parse errors encountered |
| 119 | foreach ( $this->tokenizer->getParseErrors() as $error ) { |
| 120 | $this->parseErrors[] = $error; |
| 121 | } |
| 122 | $this->tokenizer->clearParseErrors(); |
| 123 | } |
| 124 | } |
| 125 | |
| 126 | /** |
| 127 | * Consume a token, also consuming any following whitespace (and comments) |
| 128 | */ |
| 129 | protected function consumeTokenAndWhitespace() { |
| 130 | do { |
| 131 | $this->consumeToken(); |
| 132 | } while ( $this->currentToken->type() === Token::T_WHITESPACE ); |
| 133 | } |
| 134 | |
| 135 | /** |
| 136 | * Return all parse errors seen so far |
| 137 | * @return array Array of [ string $tag, int $line, int $pos, ... ] |
| 138 | */ |
| 139 | public function getParseErrors() { |
| 140 | return $this->parseErrors; |
| 141 | } |
| 142 | |
| 143 | /** |
| 144 | * Clear parse errors |
| 145 | */ |
| 146 | public function clearParseErrors() { |
| 147 | $this->parseErrors = []; |
| 148 | } |
| 149 | |
| 150 | /** |
| 151 | * Record a parse error |
| 152 | * @param string $tag Error tag |
| 153 | * @param Token $token Report the error as starting at this token. |
| 154 | * @param array $data Extra data about the error. |
| 155 | */ |
| 156 | protected function parseError( $tag, Token $token, array $data = [] ) { |
| 157 | [ $line, $pos ] = $token->getPosition(); |
| 158 | $this->parseErrors[] = array_merge( [ $tag, $line, $pos ], $data ); |
| 159 | } |
| 160 | |
| 161 | /** |
| 162 | * Parse a stylesheet |
| 163 | * @see https://www.w3.org/TR/2019/CR-css-syntax-3-20190716/#parse-stylesheet |
| 164 | * @return Stylesheet |
| 165 | */ |
| 166 | public function parseStylesheet() { |
| 167 | // Move to the first token |
| 168 | $this->consumeToken(); |
| 169 | $list = $this->consumeRuleList( true ); |
| 170 | |
| 171 | return new Stylesheet( $list ); |
| 172 | } |
| 173 | |
| 174 | /** |
| 175 | * Parse a list of rules |
| 176 | * @see https://www.w3.org/TR/2019/CR-css-syntax-3-20190716/#parse-list-of-rules |
| 177 | * @return RuleList |
| 178 | */ |
| 179 | public function parseRuleList() { |
| 180 | // Move to the first token |
| 181 | $this->consumeToken(); |
| 182 | return $this->consumeRuleList( false ); |
| 183 | } |
| 184 | |
| 185 | /** |
| 186 | * Parse a rule |
| 187 | * @see https://www.w3.org/TR/2019/CR-css-syntax-3-20190716/#parse-rule |
| 188 | * @return Rule|null |
| 189 | */ |
| 190 | public function parseRule() { |
| 191 | // 1. |
| 192 | $this->consumeTokenAndWhitespace(); |
| 193 | |
| 194 | // 2. |
| 195 | if ( $this->currentToken->type() === Token::T_EOF ) { |
| 196 | // "return a syntax error"? |
| 197 | $this->parseError( 'unexpected-eof', $this->currentToken ); |
| 198 | return null; |
| 199 | } |
| 200 | |
| 201 | if ( $this->currentToken->type() === Token::T_AT_KEYWORD ) { |
| 202 | $rule = $this->consumeAtRule(); |
| 203 | } else { |
| 204 | $rule = $this->consumeQualifiedRule(); |
| 205 | if ( !$rule ) { |
| 206 | return null; |
| 207 | } |
| 208 | } |
| 209 | |
| 210 | // 3. |
| 211 | $this->consumeTokenAndWhitespace(); |
| 212 | |
| 213 | // 4. |
| 214 | if ( $this->currentToken->type() === Token::T_EOF ) { |
| 215 | return $rule; |
| 216 | } |
| 217 | |
| 218 | // "return a syntax error"? |
| 219 | $this->parseError( 'expected-eof', $this->currentToken ); |
| 220 | |
| 221 | return null; |
| 222 | } |
| 223 | |
| 224 | /** |
| 225 | * Parse a declaration |
| 226 | * @see https://www.w3.org/TR/2019/CR-css-syntax-3-20190716/#parse-declaration |
| 227 | * @return Declaration|null |
| 228 | */ |
| 229 | public function parseDeclaration() { |
| 230 | // 1. |
| 231 | $this->consumeTokenAndWhitespace(); |
| 232 | |
| 233 | // 2. |
| 234 | if ( $this->currentToken->type() !== Token::T_IDENT ) { |
| 235 | // "return a syntax error"? |
| 236 | $this->parseError( 'expected-ident', $this->currentToken ); |
| 237 | return null; |
| 238 | } |
| 239 | |
| 240 | // 3. |
| 241 | // Declarations always run to EOF, no need to check. |
| 242 | return $this->consumeDeclaration(); |
| 243 | } |
| 244 | |
| 245 | /** |
| 246 | * Parse a list of declarations |
| 247 | * @note This is not the entry point the standard calls "parse a list of declarations", |
| 248 | * see self::parseDeclarationOrAtRuleList() |
| 249 | * @return DeclarationList |
| 250 | */ |
| 251 | public function parseDeclarationList() { |
| 252 | // Move to the first token |
| 253 | $this->consumeToken(); |
| 254 | return $this->consumeDeclarationOrAtRuleList( false ); |
| 255 | } |
| 256 | |
| 257 | /** |
| 258 | * Parse a list of declarations and at-rules |
| 259 | * @note This is the entry point the standard calls "parse a list of declarations" |
| 260 | * @see https://www.w3.org/TR/2019/CR-css-syntax-3-20190716/#parse-list-of-declarations |
| 261 | * @return DeclarationOrAtRuleList |
| 262 | */ |
| 263 | public function parseDeclarationOrAtRuleList() { |
| 264 | // Move to the first token |
| 265 | $this->consumeToken(); |
| 266 | return $this->consumeDeclarationOrAtRuleList(); |
| 267 | } |
| 268 | |
| 269 | /** |
| 270 | * Parse a (non-whitespace) component value |
| 271 | * @see https://www.w3.org/TR/2019/CR-css-syntax-3-20190716/#parse-component-value |
| 272 | * @return ComponentValue|null |
| 273 | */ |
| 274 | public function parseComponentValue() { |
| 275 | // 1. |
| 276 | $this->consumeTokenAndWhitespace(); |
| 277 | |
| 278 | // 2. |
| 279 | if ( $this->currentToken->type() === Token::T_EOF ) { |
| 280 | // "return a syntax error"? |
| 281 | $this->parseError( 'unexpected-eof', $this->currentToken ); |
| 282 | return null; |
| 283 | } |
| 284 | |
| 285 | // 3. |
| 286 | $value = $this->consumeComponentValue(); |
| 287 | |
| 288 | // 4. |
| 289 | $this->consumeTokenAndWhitespace(); |
| 290 | |
| 291 | // 5. |
| 292 | if ( $this->currentToken->type() === Token::T_EOF ) { |
| 293 | return $value; |
| 294 | } |
| 295 | |
| 296 | // "return a syntax error"? |
| 297 | $this->parseError( 'expected-eof', $this->currentToken ); |
| 298 | |
| 299 | return null; |
| 300 | } |
| 301 | |
| 302 | /** |
| 303 | * Parse a list of component values |
| 304 | * @see https://www.w3.org/TR/2019/CR-css-syntax-3-20190716/#parse-list-of-component-values |
| 305 | * @return ComponentValueList |
| 306 | */ |
| 307 | public function parseComponentValueList() { |
| 308 | $list = new ComponentValueList(); |
| 309 | while ( true ) { |
| 310 | // Move to the first/next token |
| 311 | $this->consumeToken(); |
| 312 | $value = $this->consumeComponentValue(); |
| 313 | if ( $value instanceof Token && $value->type() === Token::T_EOF ) { |
| 314 | break; |
| 315 | } |
| 316 | $list->add( $value ); |
| 317 | } |
| 318 | |
| 319 | return $list; |
| 320 | } |
| 321 | |
| 322 | /** |
| 323 | * Parse a comma-separated list of component values |
| 324 | * @see https://www.w3.org/TR/2019/CR-css-syntax-3-20190716/#parse-comma-separated-list-of-component-values |
| 325 | * @return ComponentValueList[] |
| 326 | */ |
| 327 | public function parseCommaSeparatedComponentValueList() { |
| 328 | $lists = []; |
| 329 | do { |
| 330 | $list = new ComponentValueList(); |
| 331 | while ( true ) { |
| 332 | // Move to the first/next token |
| 333 | $this->consumeToken(); |
| 334 | $value = $this->consumeComponentValue(); |
| 335 | if ( $value instanceof Token && |
| 336 | ( $value->type() === Token::T_EOF || $value->type() === Token::T_COMMA ) |
| 337 | ) { |
| 338 | break; |
| 339 | } |
| 340 | $list->add( $value ); |
| 341 | } |
| 342 | $lists[] = $list; |
| 343 | } while ( $value->type() === Token::T_COMMA ); |
| 344 | |
| 345 | return $lists; |
| 346 | } |
| 347 | |
| 348 | /** |
| 349 | * Consume a list of rules |
| 350 | * @see https://www.w3.org/TR/2019/CR-css-syntax-3-20190716/#consume-list-of-rules |
| 351 | * @param bool $topLevel Determines the behavior when CDO and CDC tokens are encountered |
| 352 | * @return RuleList |
| 353 | */ |
| 354 | protected function consumeRuleList( $topLevel ) { |
| 355 | // @phan-suppress-previous-line PhanPluginNeverReturnMethod |
| 356 | $list = new RuleList(); |
| 357 | // @phan-suppress-next-line PhanInfiniteLoop |
| 358 | while ( true ) { |
| 359 | $rule = false; |
| 360 | switch ( $this->currentToken->type() ) { |
| 361 | case Token::T_WHITESPACE: |
| 362 | break; |
| 363 | |
| 364 | case Token::T_EOF: |
| 365 | break 2; |
| 366 | |
| 367 | case Token::T_CDO: |
| 368 | case Token::T_CDC: |
| 369 | if ( !$topLevel ) { |
| 370 | $rule = $this->consumeQualifiedRule(); |
| 371 | } |
| 372 | // Else, do nothing |
| 373 | break; |
| 374 | |
| 375 | case Token::T_AT_KEYWORD: |
| 376 | $rule = $this->consumeAtRule(); |
| 377 | break; |
| 378 | |
| 379 | default: |
| 380 | $rule = $this->consumeQualifiedRule(); |
| 381 | break; |
| 382 | } |
| 383 | |
| 384 | if ( $rule ) { |
| 385 | $list->add( $rule ); |
| 386 | } |
| 387 | $this->consumeToken(); |
| 388 | } |
| 389 | |
| 390 | // @phan-suppress-next-line PhanPluginUnreachableCode Reached by break 2 |
| 391 | return $list; |
| 392 | } |
| 393 | |
| 394 | /** |
| 395 | * Consume a list of declarations and at-rules |
| 396 | * @see https://www.w3.org/TR/2019/CR-css-syntax-3-20190716/#consume-list-of-declarations |
| 397 | * @param bool $allowAtRules Whether to allow at-rules. This flag is not in |
| 398 | * the spec and is used to implement the non-spec self::parseDeclarationList(). |
| 399 | * @return DeclarationOrAtRuleList|DeclarationList |
| 400 | */ |
| 401 | protected function consumeDeclarationOrAtRuleList( $allowAtRules = true ) { |
| 402 | // @phan-suppress-previous-line PhanPluginNeverReturnMethod |
| 403 | $list = $allowAtRules ? new DeclarationOrAtRuleList() : new DeclarationList(); |
| 404 | // @phan-suppress-next-line PhanInfiniteLoop |
| 405 | while ( true ) { |
| 406 | $declaration = false; |
| 407 | switch ( $this->currentToken->type() ) { |
| 408 | case Token::T_WHITESPACE: |
| 409 | break; |
| 410 | |
| 411 | case Token::T_SEMICOLON: |
| 412 | $declaration = null; |
| 413 | break; |
| 414 | |
| 415 | case Token::T_EOF: |
| 416 | break 2; |
| 417 | |
| 418 | case Token::T_AT_KEYWORD: |
| 419 | if ( $allowAtRules ) { |
| 420 | $declaration = $this->consumeAtRule(); |
| 421 | } else { |
| 422 | $this->parseError( 'unexpected-token-in-declaration-list', $this->currentToken ); |
| 423 | $this->consumeAtRule(); |
| 424 | $declaration = null; |
| 425 | } |
| 426 | break; |
| 427 | |
| 428 | case Token::T_IDENT: |
| 429 | $cvs = []; |
| 430 | do { |
| 431 | $cvs[] = $this->consumeComponentValue(); |
| 432 | $this->consumeToken(); |
| 433 | } while ( |
| 434 | $this->currentToken->type() !== Token::T_SEMICOLON && |
| 435 | $this->currentToken->type() !== Token::T_EOF |
| 436 | ); |
| 437 | $tokens = ( new ComponentValueList( $cvs ) )->toTokenArray(); |
| 438 | $parser = static::newFromTokens( $tokens, $this->currentToken ); |
| 439 | // Load that first token |
| 440 | $parser->consumeToken(); |
| 441 | $declaration = $parser->consumeDeclaration(); |
| 442 | // Propagate any errors |
| 443 | $this->parseErrors = array_merge( $this->parseErrors, $parser->parseErrors ); |
| 444 | break; |
| 445 | |
| 446 | default: |
| 447 | $this->parseError( 'unexpected-token-in-declaration-list', $this->currentToken ); |
| 448 | do { |
| 449 | $this->consumeComponentValue(); |
| 450 | $this->consumeToken(); |
| 451 | } while ( |
| 452 | $this->currentToken->type() !== Token::T_SEMICOLON && |
| 453 | $this->currentToken->type() !== Token::T_EOF |
| 454 | ); |
| 455 | $declaration = null; |
| 456 | break; |
| 457 | } |
| 458 | |
| 459 | if ( $declaration ) { |
| 460 | $list->add( $declaration ); |
| 461 | } |
| 462 | $this->consumeToken(); |
| 463 | } |
| 464 | |
| 465 | // @phan-suppress-next-line PhanPluginUnreachableCode Reached by break 2 |
| 466 | return $list; |
| 467 | } |
| 468 | |
| 469 | /** |
| 470 | * Consume a declaration |
| 471 | * @see https://www.w3.org/TR/2019/CR-css-syntax-3-20190716/#consume-declaration |
| 472 | * @return Declaration|null |
| 473 | */ |
| 474 | protected function consumeDeclaration() { |
| 475 | $declaration = new Declaration( $this->currentToken ); |
| 476 | |
| 477 | // 1. |
| 478 | $this->consumeTokenAndWhitespace(); |
| 479 | |
| 480 | // 2. and 3. |
| 481 | if ( $this->currentToken->type() !== Token::T_COLON ) { |
| 482 | $this->parseError( 'expected-colon', $this->currentToken ); |
| 483 | return null; |
| 484 | } |
| 485 | $this->consumeTokenAndWhitespace(); |
| 486 | |
| 487 | // 4. |
| 488 | $value = $declaration->getValue(); |
| 489 | $l1 = $l2 = -1; |
| 490 | while ( $this->currentToken->type() !== Token::T_EOF ) { |
| 491 | $value->add( $this->consumeComponentValue() ); |
| 492 | if ( $this->currentToken->type() !== Token::T_WHITESPACE ) { |
| 493 | $l1 = $l2; |
| 494 | $l2 = $value->count() - 1; |
| 495 | } |
| 496 | $this->consumeToken(); |
| 497 | } |
| 498 | |
| 499 | // 5. and part of 6. |
| 500 | // @phan-suppress-next-line PhanSuspiciousValueComparison False positive about $l1 is -1 |
| 501 | $v1 = $l1 >= 0 ? $value[$l1] : null; |
| 502 | $v2 = $l2 >= 0 ? $value[$l2] : null; |
| 503 | if ( $v1 instanceof Token && |
| 504 | $v1->type() === Token::T_DELIM && |
| 505 | $v1->value() === '!' && |
| 506 | $v2 instanceof Token && |
| 507 | $v2->type() === Token::T_IDENT && |
| 508 | !strcasecmp( $v2->value(), 'important' ) |
| 509 | ) { |
| 510 | // This removes the "!" and "important" (5), and also any whitespace between/after (6) |
| 511 | while ( isset( $value[$l1] ) ) { |
| 512 | $value->remove( $l1 ); |
| 513 | } |
| 514 | $declaration->setImportant( true ); |
| 515 | } |
| 516 | |
| 517 | // Rest of 6. |
| 518 | $i = $value->count(); |
| 519 | // @phan-suppress-next-line PhanNonClassMethodCall False positive |
| 520 | while ( --$i >= 0 && $value[$i] instanceof Token && $value[$i]->type() === Token::T_WHITESPACE ) { |
| 521 | $value->remove( $i ); |
| 522 | } |
| 523 | |
| 524 | // 7. |
| 525 | return $declaration; |
| 526 | } |
| 527 | |
| 528 | /** |
| 529 | * Consume an at-rule |
| 530 | * @see https://www.w3.org/TR/2019/CR-css-syntax-3-20190716/#consume-at-rule |
| 531 | * @return AtRule |
| 532 | * @suppress PhanPluginNeverReturnMethod due to break 2; |
| 533 | */ |
| 534 | protected function consumeAtRule() { |
| 535 | $rule = new AtRule( $this->currentToken ); |
| 536 | $this->consumeToken(); |
| 537 | // @phan-suppress-next-line PhanInfiniteLoop |
| 538 | while ( true ) { |
| 539 | switch ( $this->currentToken->type() ) { |
| 540 | case Token::T_SEMICOLON: |
| 541 | break 2; |
| 542 | |
| 543 | case Token::T_EOF: |
| 544 | if ( $this->currentToken->typeFlag() !== 'recursion-depth-exceeded' ) { |
| 545 | $this->parseError( 'unexpected-eof-in-rule', $this->currentToken ); |
| 546 | } |
| 547 | break 2; |
| 548 | |
| 549 | case Token::T_LEFT_BRACE: |
| 550 | $rule->setBlock( $this->consumeSimpleBlock() ); |
| 551 | break 2; |
| 552 | |
| 553 | // Spec has "simple block with an associated token of <{-token>" here, but that isn't possible |
| 554 | // because it's not a Token. |
| 555 | |
| 556 | default: |
| 557 | $rule->getPrelude()->add( $this->consumeComponentValue() ); |
| 558 | break; |
| 559 | } |
| 560 | $this->consumeToken(); |
| 561 | } |
| 562 | |
| 563 | // @phan-suppress-next-line PhanPluginUnreachableCode False positive due to break 2; |
| 564 | return $rule; |
| 565 | } |
| 566 | |
| 567 | /** |
| 568 | * Consume a qualified rule |
| 569 | * @see https://www.w3.org/TR/2019/CR-css-syntax-3-20190716/#consume-qualified-rule |
| 570 | * @return QualifiedRule|null |
| 571 | */ |
| 572 | protected function consumeQualifiedRule() { |
| 573 | $rule = new QualifiedRule( $this->currentToken ); |
| 574 | while ( true ) { |
| 575 | switch ( $this->currentToken->type() ) { |
| 576 | case Token::T_EOF: |
| 577 | if ( $this->currentToken->typeFlag() !== 'recursion-depth-exceeded' ) { |
| 578 | $this->parseError( 'unexpected-eof-in-rule', $this->currentToken ); |
| 579 | } |
| 580 | return null; |
| 581 | |
| 582 | case Token::T_LEFT_BRACE: |
| 583 | $rule->setBlock( $this->consumeSimpleBlock() ); |
| 584 | break 2; |
| 585 | |
| 586 | // Spec has "simple block with an associated token of <{-token>" here, but that isn't possible |
| 587 | // because it's not a Token. |
| 588 | |
| 589 | default: |
| 590 | $rule->getPrelude()->add( $this->consumeComponentValue() ); |
| 591 | break; |
| 592 | } |
| 593 | $this->consumeToken(); |
| 594 | } |
| 595 | |
| 596 | // @phan-suppress-next-line PhanPluginUnreachableCode False positive due to break 2; |
| 597 | return $rule; |
| 598 | } |
| 599 | |
| 600 | /** |
| 601 | * Consume a component value |
| 602 | * @see https://www.w3.org/TR/2019/CR-css-syntax-3-20190716/#consume-component-value |
| 603 | * @return ComponentValue |
| 604 | */ |
| 605 | protected function consumeComponentValue() { |
| 606 | if ( ++$this->cvDepth > static::CV_DEPTH_LIMIT ) { |
| 607 | $this->parseError( 'recursion-depth-exceeded', $this->currentToken ); |
| 608 | // There's no way to safely recover from this without more recursion. |
| 609 | // So just eat the rest of the input, then return a |
| 610 | // specially-flagged EOF, so we can avoid 100 "unexpected EOF" |
| 611 | // errors. |
| 612 | $position = $this->currentToken->getPosition(); |
| 613 | while ( $this->currentToken->type() !== Token::T_EOF ) { |
| 614 | $this->consumeToken(); |
| 615 | } |
| 616 | $this->currentToken = new Token( Token::T_EOF, [ |
| 617 | 'position' => $position, |
| 618 | 'typeFlag' => 'recursion-depth-exceeded' |
| 619 | ] ); |
| 620 | } |
| 621 | |
| 622 | switch ( $this->currentToken->type() ) { |
| 623 | case Token::T_LEFT_BRACE: |
| 624 | case Token::T_LEFT_BRACKET: |
| 625 | case Token::T_LEFT_PAREN: |
| 626 | $ret = $this->consumeSimpleBlock(); |
| 627 | break; |
| 628 | |
| 629 | case Token::T_FUNCTION: |
| 630 | $ret = $this->consumeFunction(); |
| 631 | break; |
| 632 | |
| 633 | default: |
| 634 | $ret = $this->currentToken; |
| 635 | break; |
| 636 | } |
| 637 | |
| 638 | $this->cvDepth--; |
| 639 | // @phan-suppress-next-line PhanTypeMismatchReturnNullable $ret always set |
| 640 | return $ret; |
| 641 | } |
| 642 | |
| 643 | /** |
| 644 | * Consume a simple block |
| 645 | * @see https://www.w3.org/TR/2019/CR-css-syntax-3-20190716/#consume-simple-block |
| 646 | * @return SimpleBlock |
| 647 | * @suppress PhanPluginNeverReturnMethod due to break 2; |
| 648 | */ |
| 649 | protected function consumeSimpleBlock() { |
| 650 | $block = new SimpleBlock( $this->currentToken ); |
| 651 | $endTokenType = $block->getEndTokenType(); |
| 652 | $this->consumeToken(); |
| 653 | // @phan-suppress-next-line PhanInfiniteLoop |
| 654 | while ( true ) { |
| 655 | switch ( $this->currentToken->type() ) { |
| 656 | case Token::T_EOF: |
| 657 | if ( $this->currentToken->typeFlag() !== 'recursion-depth-exceeded' ) { |
| 658 | $this->parseError( 'unexpected-eof-in-block', $this->currentToken ); |
| 659 | } |
| 660 | break 2; |
| 661 | |
| 662 | case $endTokenType: |
| 663 | break 2; |
| 664 | |
| 665 | default: |
| 666 | $block->getValue()->add( $this->consumeComponentValue() ); |
| 667 | break; |
| 668 | } |
| 669 | $this->consumeToken(); |
| 670 | } |
| 671 | |
| 672 | // @phan-suppress-next-line PhanPluginUnreachableCode False positive due to break 2; |
| 673 | return $block; |
| 674 | } |
| 675 | |
| 676 | /** |
| 677 | * Consume a function |
| 678 | * @see https://www.w3.org/TR/2019/CR-css-syntax-3-20190716/#consume-function |
| 679 | * @return CSSFunction |
| 680 | * @suppress PhanPluginNeverReturnMethod due to break 2; |
| 681 | */ |
| 682 | protected function consumeFunction() { |
| 683 | $function = new CSSFunction( $this->currentToken ); |
| 684 | $this->consumeToken(); |
| 685 | |
| 686 | // @phan-suppress-next-line PhanInfiniteLoop |
| 687 | while ( true ) { |
| 688 | switch ( $this->currentToken->type() ) { |
| 689 | case Token::T_EOF: |
| 690 | if ( $this->currentToken->typeFlag() !== 'recursion-depth-exceeded' ) { |
| 691 | $this->parseError( 'unexpected-eof-in-function', $this->currentToken ); |
| 692 | } |
| 693 | break 2; |
| 694 | |
| 695 | case Token::T_RIGHT_PAREN: |
| 696 | break 2; |
| 697 | |
| 698 | default: |
| 699 | $function->getValue()->add( $this->consumeComponentValue() ); |
| 700 | break; |
| 701 | } |
| 702 | $this->consumeToken(); |
| 703 | } |
| 704 | |
| 705 | // @phan-suppress-next-line PhanPluginUnreachableCode False positive due to break 2; |
| 706 | return $function; |
| 707 | } |
| 708 | |
| 709 | // @codeCoverageIgnoreEnd |
| 710 | } |