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<?php

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* This file is part of the Symfony package.

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* (c) Fabien Potencier <fabien@symfony.com>

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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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namespace WPForms\Vendor\Symfony\Component\CssSelector\Parser;

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use WPForms\Vendor\Symfony\Component\CssSelector\Exception\SyntaxErrorException;

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use WPForms\Vendor\Symfony\Component\CssSelector\Node;

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use WPForms\Vendor\Symfony\Component\CssSelector\Parser\Tokenizer\Tokenizer;

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/**

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* CSS selector parser.

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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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* @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>

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* @internal

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class Parser implements ParserInterface

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{

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/**

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* @var Tokenizer

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private $tokenizer;

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/**

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* Constructor.

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* @param null|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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/**

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* {@inheritdoc}

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public function parse($source)

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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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* @param Token[] $tokens

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* @return array

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* @throws SyntaxErrorException

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public static function parseSeries(array $tokens)

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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 array(2, 1);

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case 'even' === $joined:

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return array(2, 0);

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case 'n' === $joined:

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return array(1, 0);

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case \false === \strpos($joined, 'n'):

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return array(0, $int($joined));

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}

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$split = \explode('n', $joined);

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$first = isset($split[0]) ? $split[0] : null;

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return array($first ? '-' === $first || '+' === $first ? $int($first . '1') : $int($first) : 1, isset($split[1]) && $split[1] ? $int($split[1]) : 0);

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}

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/**

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* Parses selector nodes.

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* @param TokenStream $stream

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* @return array

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private function parseSelectorList(TokenStream $stream)

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{

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$stream->skipWhitespace();

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$selectors = array();

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while (\true) {

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$selectors[] = $this->parserSelectorNode($stream);

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if ($stream->getPeek()->isDelimiter(array(','))) {

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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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/**

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* Parses next selector or combined node.

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* @param TokenStream $stream

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* @return Node\SelectorNode

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* @throws SyntaxErrorException

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private function parserSelectorNode(TokenStream $stream)

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{

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list($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(array(','))) {

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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(array('+', '>', '~'))) {

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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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list($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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* @param TokenStream $stream

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* @param bool $insideNegation

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* @return array

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* @throws SyntaxErrorException

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private function parseSimpleSelector(TokenStream $stream, $insideNegation = \false)

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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() || $peek->isFileEnd() || $peek->isDelimiter(array(',', '+', '>', '~')) || $insideNegation && $peek->isDelimiter(array(')'))) {

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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(array('.'))) {

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$stream->getNext();

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$result = new Node\ClassNode($result, $stream->getNextIdentifier());

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} elseif ($peek->isDelimiter(array('['))) {

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$stream->getNext();

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$result = $this->parseAttributeNode($result, $stream);

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} elseif ($peek->isDelimiter(array(':'))) {

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$stream->getNext();

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if ($stream->getPeek()->isDelimiter(array(':'))) {

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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), array('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(array('('))) {

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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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list($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(array(')'))) {

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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 = array();

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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() || $next->isString() || $next->isNumber() || $next->isDelimiter(array('+', '-'))) {

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$arguments[] = $next;

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} elseif ($next->isDelimiter(array(')'))) {

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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 (empty($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 array($result, $pseudoElement);

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}

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/**

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* Parses next element node.

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* @param TokenStream $stream

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* @return Node\ElementNode

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private function parseElementNode(TokenStream $stream)

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{

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$peek = $stream->getPeek();

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if ($peek->isIdentifier() || $peek->isDelimiter(array('*'))) {

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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(array('|'))) {

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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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/**

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* Parses next attribute node.

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* @param Node\NodeInterface $selector

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* @param TokenStream $stream

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* @return Node\AttributeNode

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* @throws SyntaxErrorException

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private function parseAttributeNode(Node\NodeInterface $selector, TokenStream $stream)

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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(array('|'))) {

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throw SyntaxErrorException::unexpectedToken('"|"', $stream->getPeek());

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}

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if ($stream->getPeek()->isDelimiter(array('|'))) {

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$stream->getNext();

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if ($stream->getPeek()->isDelimiter(array('='))) {

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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(array(']'))) {

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return new Node\AttributeNode($selector, $namespace, $attribute, 'exists', null);

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} elseif ($next->isDelimiter(array('='))) {

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$operator = '=';

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} elseif ($next->isDelimiter(array('^', '$', '*', '~', '|', '!')) && $stream->getPeek()->isDelimiter(array('='))) {

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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(array(']'))) {

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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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