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