Handler
2 years ago
Shortcut
2 years ago
Tokenizer
2 years ago
Parser.php
2 years ago
ParserInterface.php
2 years ago
Reader.php
2 years ago
Token.php
2 years ago
TokenStream.php
2 years ago
Parser.php
354 lines
| 1 | <?php |
| 2 | |
| 3 | /* |
| 4 | * This file is part of the Symfony package. |
| 5 | * |
| 6 | * (c) Fabien Potencier <fabien@symfony.com> |
| 7 | * |
| 8 | * For the full copyright and license information, please view the LICENSE |
| 9 | * file that was distributed with this source code. |
| 10 | */ |
| 11 | |
| 12 | namespace Symfony\Component\CssSelector\Parser; |
| 13 | |
| 14 | use Symfony\Component\CssSelector\Exception\SyntaxErrorException; |
| 15 | use Symfony\Component\CssSelector\Node; |
| 16 | use Symfony\Component\CssSelector\Parser\Tokenizer\Tokenizer; |
| 17 | |
| 18 | /** |
| 19 | * CSS selector parser. |
| 20 | * |
| 21 | * This component is a port of the Python cssselect library, |
| 22 | * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect. |
| 23 | * |
| 24 | * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com> |
| 25 | * |
| 26 | * @internal |
| 27 | */ |
| 28 | class Parser implements ParserInterface |
| 29 | { |
| 30 | private $tokenizer; |
| 31 | |
| 32 | public function __construct(?Tokenizer $tokenizer = null) |
| 33 | { |
| 34 | $this->tokenizer = $tokenizer ?? new Tokenizer(); |
| 35 | } |
| 36 | |
| 37 | /** |
| 38 | * {@inheritdoc} |
| 39 | */ |
| 40 | public function parse(string $source): array |
| 41 | { |
| 42 | $reader = new Reader($source); |
| 43 | $stream = $this->tokenizer->tokenize($reader); |
| 44 | |
| 45 | return $this->parseSelectorList($stream); |
| 46 | } |
| 47 | |
| 48 | /** |
| 49 | * Parses the arguments for ":nth-child()" and friends. |
| 50 | * |
| 51 | * @param Token[] $tokens |
| 52 | * |
| 53 | * @throws SyntaxErrorException |
| 54 | */ |
| 55 | public static function parseSeries(array $tokens): array |
| 56 | { |
| 57 | foreach ($tokens as $token) { |
| 58 | if ($token->isString()) { |
| 59 | throw SyntaxErrorException::stringAsFunctionArgument(); |
| 60 | } |
| 61 | } |
| 62 | |
| 63 | $joined = trim(implode('', array_map(function (Token $token) { |
| 64 | return $token->getValue(); |
| 65 | }, $tokens))); |
| 66 | |
| 67 | $int = function ($string) { |
| 68 | if (!is_numeric($string)) { |
| 69 | throw SyntaxErrorException::stringAsFunctionArgument(); |
| 70 | } |
| 71 | |
| 72 | return (int) $string; |
| 73 | }; |
| 74 | |
| 75 | switch (true) { |
| 76 | case 'odd' === $joined: |
| 77 | return [2, 1]; |
| 78 | case 'even' === $joined: |
| 79 | return [2, 0]; |
| 80 | case 'n' === $joined: |
| 81 | return [1, 0]; |
| 82 | case !str_contains($joined, 'n'): |
| 83 | return [0, $int($joined)]; |
| 84 | } |
| 85 | |
| 86 | $split = explode('n', $joined); |
| 87 | $first = $split[0] ?? null; |
| 88 | |
| 89 | return [ |
| 90 | $first ? ('-' === $first || '+' === $first ? $int($first.'1') : $int($first)) : 1, |
| 91 | isset($split[1]) && $split[1] ? $int($split[1]) : 0, |
| 92 | ]; |
| 93 | } |
| 94 | |
| 95 | private function parseSelectorList(TokenStream $stream): array |
| 96 | { |
| 97 | $stream->skipWhitespace(); |
| 98 | $selectors = []; |
| 99 | |
| 100 | while (true) { |
| 101 | $selectors[] = $this->parserSelectorNode($stream); |
| 102 | |
| 103 | if ($stream->getPeek()->isDelimiter([','])) { |
| 104 | $stream->getNext(); |
| 105 | $stream->skipWhitespace(); |
| 106 | } else { |
| 107 | break; |
| 108 | } |
| 109 | } |
| 110 | |
| 111 | return $selectors; |
| 112 | } |
| 113 | |
| 114 | private function parserSelectorNode(TokenStream $stream): Node\SelectorNode |
| 115 | { |
| 116 | [$result, $pseudoElement] = $this->parseSimpleSelector($stream); |
| 117 | |
| 118 | while (true) { |
| 119 | $stream->skipWhitespace(); |
| 120 | $peek = $stream->getPeek(); |
| 121 | |
| 122 | if ($peek->isFileEnd() || $peek->isDelimiter([','])) { |
| 123 | break; |
| 124 | } |
| 125 | |
| 126 | if (null !== $pseudoElement) { |
| 127 | throw SyntaxErrorException::pseudoElementFound($pseudoElement, 'not at the end of a selector'); |
| 128 | } |
| 129 | |
| 130 | if ($peek->isDelimiter(['+', '>', '~'])) { |
| 131 | $combinator = $stream->getNext()->getValue(); |
| 132 | $stream->skipWhitespace(); |
| 133 | } else { |
| 134 | $combinator = ' '; |
| 135 | } |
| 136 | |
| 137 | [$nextSelector, $pseudoElement] = $this->parseSimpleSelector($stream); |
| 138 | $result = new Node\CombinedSelectorNode($result, $combinator, $nextSelector); |
| 139 | } |
| 140 | |
| 141 | return new Node\SelectorNode($result, $pseudoElement); |
| 142 | } |
| 143 | |
| 144 | /** |
| 145 | * Parses next simple node (hash, class, pseudo, negation). |
| 146 | * |
| 147 | * @throws SyntaxErrorException |
| 148 | */ |
| 149 | private function parseSimpleSelector(TokenStream $stream, bool $insideNegation = false): array |
| 150 | { |
| 151 | $stream->skipWhitespace(); |
| 152 | |
| 153 | $selectorStart = \count($stream->getUsed()); |
| 154 | $result = $this->parseElementNode($stream); |
| 155 | $pseudoElement = null; |
| 156 | |
| 157 | while (true) { |
| 158 | $peek = $stream->getPeek(); |
| 159 | if ($peek->isWhitespace() |
| 160 | || $peek->isFileEnd() |
| 161 | || $peek->isDelimiter([',', '+', '>', '~']) |
| 162 | || ($insideNegation && $peek->isDelimiter([')'])) |
| 163 | ) { |
| 164 | break; |
| 165 | } |
| 166 | |
| 167 | if (null !== $pseudoElement) { |
| 168 | throw SyntaxErrorException::pseudoElementFound($pseudoElement, 'not at the end of a selector'); |
| 169 | } |
| 170 | |
| 171 | if ($peek->isHash()) { |
| 172 | $result = new Node\HashNode($result, $stream->getNext()->getValue()); |
| 173 | } elseif ($peek->isDelimiter(['.'])) { |
| 174 | $stream->getNext(); |
| 175 | $result = new Node\ClassNode($result, $stream->getNextIdentifier()); |
| 176 | } elseif ($peek->isDelimiter(['['])) { |
| 177 | $stream->getNext(); |
| 178 | $result = $this->parseAttributeNode($result, $stream); |
| 179 | } elseif ($peek->isDelimiter([':'])) { |
| 180 | $stream->getNext(); |
| 181 | |
| 182 | if ($stream->getPeek()->isDelimiter([':'])) { |
| 183 | $stream->getNext(); |
| 184 | $pseudoElement = $stream->getNextIdentifier(); |
| 185 | |
| 186 | continue; |
| 187 | } |
| 188 | |
| 189 | $identifier = $stream->getNextIdentifier(); |
| 190 | if (\in_array(strtolower($identifier), ['first-line', 'first-letter', 'before', 'after'])) { |
| 191 | // Special case: CSS 2.1 pseudo-elements can have a single ':'. |
| 192 | // Any new pseudo-element must have two. |
| 193 | $pseudoElement = $identifier; |
| 194 | |
| 195 | continue; |
| 196 | } |
| 197 | |
| 198 | if (!$stream->getPeek()->isDelimiter(['('])) { |
| 199 | $result = new Node\PseudoNode($result, $identifier); |
| 200 | |
| 201 | continue; |
| 202 | } |
| 203 | |
| 204 | $stream->getNext(); |
| 205 | $stream->skipWhitespace(); |
| 206 | |
| 207 | if ('not' === strtolower($identifier)) { |
| 208 | if ($insideNegation) { |
| 209 | throw SyntaxErrorException::nestedNot(); |
| 210 | } |
| 211 | |
| 212 | [$argument, $argumentPseudoElement] = $this->parseSimpleSelector($stream, true); |
| 213 | $next = $stream->getNext(); |
| 214 | |
| 215 | if (null !== $argumentPseudoElement) { |
| 216 | throw SyntaxErrorException::pseudoElementFound($argumentPseudoElement, 'inside ::not()'); |
| 217 | } |
| 218 | |
| 219 | if (!$next->isDelimiter([')'])) { |
| 220 | throw SyntaxErrorException::unexpectedToken('")"', $next); |
| 221 | } |
| 222 | |
| 223 | $result = new Node\NegationNode($result, $argument); |
| 224 | } else { |
| 225 | $arguments = []; |
| 226 | $next = null; |
| 227 | |
| 228 | while (true) { |
| 229 | $stream->skipWhitespace(); |
| 230 | $next = $stream->getNext(); |
| 231 | |
| 232 | if ($next->isIdentifier() |
| 233 | || $next->isString() |
| 234 | || $next->isNumber() |
| 235 | || $next->isDelimiter(['+', '-']) |
| 236 | ) { |
| 237 | $arguments[] = $next; |
| 238 | } elseif ($next->isDelimiter([')'])) { |
| 239 | break; |
| 240 | } else { |
| 241 | throw SyntaxErrorException::unexpectedToken('an argument', $next); |
| 242 | } |
| 243 | } |
| 244 | |
| 245 | if (empty($arguments)) { |
| 246 | throw SyntaxErrorException::unexpectedToken('at least one argument', $next); |
| 247 | } |
| 248 | |
| 249 | $result = new Node\FunctionNode($result, $identifier, $arguments); |
| 250 | } |
| 251 | } else { |
| 252 | throw SyntaxErrorException::unexpectedToken('selector', $peek); |
| 253 | } |
| 254 | } |
| 255 | |
| 256 | if (\count($stream->getUsed()) === $selectorStart) { |
| 257 | throw SyntaxErrorException::unexpectedToken('selector', $stream->getPeek()); |
| 258 | } |
| 259 | |
| 260 | return [$result, $pseudoElement]; |
| 261 | } |
| 262 | |
| 263 | private function parseElementNode(TokenStream $stream): Node\ElementNode |
| 264 | { |
| 265 | $peek = $stream->getPeek(); |
| 266 | |
| 267 | if ($peek->isIdentifier() || $peek->isDelimiter(['*'])) { |
| 268 | if ($peek->isIdentifier()) { |
| 269 | $namespace = $stream->getNext()->getValue(); |
| 270 | } else { |
| 271 | $stream->getNext(); |
| 272 | $namespace = null; |
| 273 | } |
| 274 | |
| 275 | if ($stream->getPeek()->isDelimiter(['|'])) { |
| 276 | $stream->getNext(); |
| 277 | $element = $stream->getNextIdentifierOrStar(); |
| 278 | } else { |
| 279 | $element = $namespace; |
| 280 | $namespace = null; |
| 281 | } |
| 282 | } else { |
| 283 | $element = $namespace = null; |
| 284 | } |
| 285 | |
| 286 | return new Node\ElementNode($namespace, $element); |
| 287 | } |
| 288 | |
| 289 | private function parseAttributeNode(Node\NodeInterface $selector, TokenStream $stream): Node\AttributeNode |
| 290 | { |
| 291 | $stream->skipWhitespace(); |
| 292 | $attribute = $stream->getNextIdentifierOrStar(); |
| 293 | |
| 294 | if (null === $attribute && !$stream->getPeek()->isDelimiter(['|'])) { |
| 295 | throw SyntaxErrorException::unexpectedToken('"|"', $stream->getPeek()); |
| 296 | } |
| 297 | |
| 298 | if ($stream->getPeek()->isDelimiter(['|'])) { |
| 299 | $stream->getNext(); |
| 300 | |
| 301 | if ($stream->getPeek()->isDelimiter(['='])) { |
| 302 | $namespace = null; |
| 303 | $stream->getNext(); |
| 304 | $operator = '|='; |
| 305 | } else { |
| 306 | $namespace = $attribute; |
| 307 | $attribute = $stream->getNextIdentifier(); |
| 308 | $operator = null; |
| 309 | } |
| 310 | } else { |
| 311 | $namespace = $operator = null; |
| 312 | } |
| 313 | |
| 314 | if (null === $operator) { |
| 315 | $stream->skipWhitespace(); |
| 316 | $next = $stream->getNext(); |
| 317 | |
| 318 | if ($next->isDelimiter([']'])) { |
| 319 | return new Node\AttributeNode($selector, $namespace, $attribute, 'exists', null); |
| 320 | } elseif ($next->isDelimiter(['='])) { |
| 321 | $operator = '='; |
| 322 | } elseif ($next->isDelimiter(['^', '$', '*', '~', '|', '!']) |
| 323 | && $stream->getPeek()->isDelimiter(['=']) |
| 324 | ) { |
| 325 | $operator = $next->getValue().'='; |
| 326 | $stream->getNext(); |
| 327 | } else { |
| 328 | throw SyntaxErrorException::unexpectedToken('operator', $next); |
| 329 | } |
| 330 | } |
| 331 | |
| 332 | $stream->skipWhitespace(); |
| 333 | $value = $stream->getNext(); |
| 334 | |
| 335 | if ($value->isNumber()) { |
| 336 | // if the value is a number, it's casted into a string |
| 337 | $value = new Token(Token::TYPE_STRING, (string) $value->getValue(), $value->getPosition()); |
| 338 | } |
| 339 | |
| 340 | if (!($value->isIdentifier() || $value->isString())) { |
| 341 | throw SyntaxErrorException::unexpectedToken('string or identifier', $value); |
| 342 | } |
| 343 | |
| 344 | $stream->skipWhitespace(); |
| 345 | $next = $stream->getNext(); |
| 346 | |
| 347 | if (!$next->isDelimiter([']'])) { |
| 348 | throw SyntaxErrorException::unexpectedToken('"]"', $next); |
| 349 | } |
| 350 | |
| 351 | return new Node\AttributeNode($selector, $namespace, $attribute, $operator, $value->getValue()); |
| 352 | } |
| 353 | } |
| 354 |