351 lines
11 KiB
PHP
351 lines
11 KiB
PHP
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<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\Component\CssSelector\Parser;
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use Symfony\Component\CssSelector\Exception\SyntaxErrorException;
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use Symfony\Component\CssSelector\Node;
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use Symfony\Component\CssSelector\Parser\Tokenizer\Tokenizer;
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/**
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* CSS selector parser.
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*
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* This component is a port of the Python cssselect library,
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* which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
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*
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* @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
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*
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* @internal
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*/
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class Parser implements ParserInterface
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{
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private Tokenizer $tokenizer;
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public function __construct(Tokenizer $tokenizer = null)
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{
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$this->tokenizer = $tokenizer ?? new Tokenizer();
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}
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public function parse(string $source): array
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{
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$reader = new Reader($source);
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$stream = $this->tokenizer->tokenize($reader);
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return $this->parseSelectorList($stream);
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}
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/**
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* Parses the arguments for ":nth-child()" and friends.
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*
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* @param Token[] $tokens
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*
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* @throws SyntaxErrorException
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*/
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public static function parseSeries(array $tokens): array
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{
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foreach ($tokens as $token) {
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if ($token->isString()) {
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throw SyntaxErrorException::stringAsFunctionArgument();
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}
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}
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$joined = trim(implode('', array_map(function (Token $token) {
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return $token->getValue();
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}, $tokens)));
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$int = function ($string) {
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if (!is_numeric($string)) {
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throw SyntaxErrorException::stringAsFunctionArgument();
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}
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return (int) $string;
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};
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switch (true) {
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case 'odd' === $joined:
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return [2, 1];
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case 'even' === $joined:
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return [2, 0];
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case 'n' === $joined:
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return [1, 0];
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case !str_contains($joined, 'n'):
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return [0, $int($joined)];
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}
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$split = explode('n', $joined);
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$first = $split[0] ?? null;
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return [
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$first ? ('-' === $first || '+' === $first ? $int($first.'1') : $int($first)) : 1,
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isset($split[1]) && $split[1] ? $int($split[1]) : 0,
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];
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}
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private function parseSelectorList(TokenStream $stream): array
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{
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$stream->skipWhitespace();
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$selectors = [];
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while (true) {
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$selectors[] = $this->parserSelectorNode($stream);
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if ($stream->getPeek()->isDelimiter([','])) {
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$stream->getNext();
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$stream->skipWhitespace();
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} else {
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break;
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}
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}
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return $selectors;
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}
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private function parserSelectorNode(TokenStream $stream): Node\SelectorNode
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{
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[$result, $pseudoElement] = $this->parseSimpleSelector($stream);
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while (true) {
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$stream->skipWhitespace();
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$peek = $stream->getPeek();
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if ($peek->isFileEnd() || $peek->isDelimiter([','])) {
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break;
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}
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if (null !== $pseudoElement) {
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throw SyntaxErrorException::pseudoElementFound($pseudoElement, 'not at the end of a selector');
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}
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if ($peek->isDelimiter(['+', '>', '~'])) {
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$combinator = $stream->getNext()->getValue();
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$stream->skipWhitespace();
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} else {
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$combinator = ' ';
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}
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[$nextSelector, $pseudoElement] = $this->parseSimpleSelector($stream);
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$result = new Node\CombinedSelectorNode($result, $combinator, $nextSelector);
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}
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return new Node\SelectorNode($result, $pseudoElement);
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}
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/**
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* Parses next simple node (hash, class, pseudo, negation).
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*
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* @throws SyntaxErrorException
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*/
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private function parseSimpleSelector(TokenStream $stream, bool $insideNegation = false): array
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{
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$stream->skipWhitespace();
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$selectorStart = \count($stream->getUsed());
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$result = $this->parseElementNode($stream);
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$pseudoElement = null;
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while (true) {
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$peek = $stream->getPeek();
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if ($peek->isWhitespace()
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|| $peek->isFileEnd()
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|| $peek->isDelimiter([',', '+', '>', '~'])
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|| ($insideNegation && $peek->isDelimiter([')']))
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) {
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break;
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}
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if (null !== $pseudoElement) {
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throw SyntaxErrorException::pseudoElementFound($pseudoElement, 'not at the end of a selector');
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}
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if ($peek->isHash()) {
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$result = new Node\HashNode($result, $stream->getNext()->getValue());
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} elseif ($peek->isDelimiter(['.'])) {
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$stream->getNext();
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$result = new Node\ClassNode($result, $stream->getNextIdentifier());
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} elseif ($peek->isDelimiter(['['])) {
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$stream->getNext();
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$result = $this->parseAttributeNode($result, $stream);
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} elseif ($peek->isDelimiter([':'])) {
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$stream->getNext();
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if ($stream->getPeek()->isDelimiter([':'])) {
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$stream->getNext();
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$pseudoElement = $stream->getNextIdentifier();
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continue;
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}
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$identifier = $stream->getNextIdentifier();
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if (\in_array(strtolower($identifier), ['first-line', 'first-letter', 'before', 'after'])) {
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// Special case: CSS 2.1 pseudo-elements can have a single ':'.
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// Any new pseudo-element must have two.
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$pseudoElement = $identifier;
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continue;
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}
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if (!$stream->getPeek()->isDelimiter(['('])) {
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$result = new Node\PseudoNode($result, $identifier);
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continue;
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}
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$stream->getNext();
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$stream->skipWhitespace();
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if ('not' === strtolower($identifier)) {
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if ($insideNegation) {
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throw SyntaxErrorException::nestedNot();
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}
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[$argument, $argumentPseudoElement] = $this->parseSimpleSelector($stream, true);
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$next = $stream->getNext();
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if (null !== $argumentPseudoElement) {
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throw SyntaxErrorException::pseudoElementFound($argumentPseudoElement, 'inside ::not()');
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}
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if (!$next->isDelimiter([')'])) {
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throw SyntaxErrorException::unexpectedToken('")"', $next);
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}
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$result = new Node\NegationNode($result, $argument);
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} else {
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$arguments = [];
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$next = null;
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while (true) {
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$stream->skipWhitespace();
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$next = $stream->getNext();
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if ($next->isIdentifier()
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|| $next->isString()
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|| $next->isNumber()
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|| $next->isDelimiter(['+', '-'])
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) {
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$arguments[] = $next;
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} elseif ($next->isDelimiter([')'])) {
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break;
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} else {
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throw SyntaxErrorException::unexpectedToken('an argument', $next);
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}
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}
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if (!$arguments) {
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throw SyntaxErrorException::unexpectedToken('at least one argument', $next);
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}
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$result = new Node\FunctionNode($result, $identifier, $arguments);
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}
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} else {
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throw SyntaxErrorException::unexpectedToken('selector', $peek);
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}
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}
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if (\count($stream->getUsed()) === $selectorStart) {
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throw SyntaxErrorException::unexpectedToken('selector', $stream->getPeek());
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}
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return [$result, $pseudoElement];
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}
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private function parseElementNode(TokenStream $stream): Node\ElementNode
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{
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$peek = $stream->getPeek();
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if ($peek->isIdentifier() || $peek->isDelimiter(['*'])) {
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if ($peek->isIdentifier()) {
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$namespace = $stream->getNext()->getValue();
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} else {
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$stream->getNext();
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$namespace = null;
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}
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if ($stream->getPeek()->isDelimiter(['|'])) {
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$stream->getNext();
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$element = $stream->getNextIdentifierOrStar();
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} else {
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$element = $namespace;
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$namespace = null;
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}
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} else {
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$element = $namespace = null;
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}
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return new Node\ElementNode($namespace, $element);
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}
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private function parseAttributeNode(Node\NodeInterface $selector, TokenStream $stream): Node\AttributeNode
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{
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$stream->skipWhitespace();
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$attribute = $stream->getNextIdentifierOrStar();
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if (null === $attribute && !$stream->getPeek()->isDelimiter(['|'])) {
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throw SyntaxErrorException::unexpectedToken('"|"', $stream->getPeek());
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}
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if ($stream->getPeek()->isDelimiter(['|'])) {
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$stream->getNext();
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if ($stream->getPeek()->isDelimiter(['='])) {
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$namespace = null;
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$stream->getNext();
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$operator = '|=';
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} else {
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$namespace = $attribute;
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$attribute = $stream->getNextIdentifier();
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$operator = null;
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}
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} else {
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$namespace = $operator = null;
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}
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if (null === $operator) {
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$stream->skipWhitespace();
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$next = $stream->getNext();
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if ($next->isDelimiter([']'])) {
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return new Node\AttributeNode($selector, $namespace, $attribute, 'exists', null);
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} elseif ($next->isDelimiter(['='])) {
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$operator = '=';
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} elseif ($next->isDelimiter(['^', '$', '*', '~', '|', '!'])
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&& $stream->getPeek()->isDelimiter(['='])
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) {
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$operator = $next->getValue().'=';
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$stream->getNext();
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} else {
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throw SyntaxErrorException::unexpectedToken('operator', $next);
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}
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}
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$stream->skipWhitespace();
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$value = $stream->getNext();
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if ($value->isNumber()) {
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// if the value is a number, it's casted into a string
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$value = new Token(Token::TYPE_STRING, (string) $value->getValue(), $value->getPosition());
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}
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if (!($value->isIdentifier() || $value->isString())) {
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throw SyntaxErrorException::unexpectedToken('string or identifier', $value);
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}
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$stream->skipWhitespace();
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$next = $stream->getNext();
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if (!$next->isDelimiter([']'])) {
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throw SyntaxErrorException::unexpectedToken('"]"', $next);
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}
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return new Node\AttributeNode($selector, $namespace, $attribute, $operator, $value->getValue());
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}
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}
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