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<?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
{
/**
* @var Tokenizer
*/
private $tokenizer;
/**
* Constructor.
*
* @param null|Tokenizer $tokenizer
*/
public function __construct(Tokenizer $tokenizer = null)
{
$this->tokenizer = $tokenizer ?: new Tokenizer();
}
/**
* {@inheritdoc}
*/
public function parse($source)
{
$reader = new Reader($source);
$stream = $this->tokenizer->tokenize($reader);
return $this->parseSelectorList($stream);
}
/**
* Parses the arguments for ":nth-child()" and friends.
*
* @param Token[] $tokens
*
* @return array
*
* @throws SyntaxErrorException
*/
public static function parseSeries(array $tokens)
{
foreach ($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 array(2, 1);
case 'even' === $joined:
return array(2, 0);
case 'n' === $joined:
return array(1, 0);
case false === strpos($joined, 'n'):
return array(0, $int($joined));
}
$split = explode('n', $joined);
$first = isset($split[0]) ? $split[0] : null;
return array(
$first ? ('-' === $first || '+' === $first ? $int($first.'1') : $int($first)) : 1,
isset($split[1]) && $split[1] ? $int($split[1]) : 0,
);
}
/**
* Parses selector nodes.
*
* @param TokenStream $stream
*
* @return array
*/
private function parseSelectorList(TokenStream $stream)
{
$stream->skipWhitespace();
$selectors = array();
while (true) {
$selectors[] = $this->parserSelectorNode($stream);
if ($stream->getPeek()->isDelimiter(array(','))) {
$stream->getNext();
$stream->skipWhitespace();
} else {
break;
}
}
return $selectors;
}
/**
* Parses next selector or combined node.
*
* @param TokenStream $stream
*
* @return Node\SelectorNode
*
* @throws SyntaxErrorException
*/
private function parserSelectorNode(TokenStream $stream)
{
list($result, $pseudoElement) = $this->parseSimpleSelector($stream);
while (true) {
$stream->skipWhitespace();
$peek = $stream->getPeek();
if ($peek->isFileEnd() || $peek->isDelimiter(array(','))) {
break;
}
if (null !== $pseudoElement) {
throw SyntaxErrorException::pseudoElementFound($pseudoElement, 'not at the end of a selector');
}
if ($peek->isDelimiter(array('+', '>', '~'))) {
$combinator = $stream->getNext()->getValue();
$stream->skipWhitespace();
} else {
$combinator = ' ';
}
list($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).
*
* @param TokenStream $stream
* @param bool $insideNegation
*
* @return array
*
* @throws SyntaxErrorException
*/
private function parseSimpleSelector(TokenStream $stream, $insideNegation = false)
{
$stream->skipWhitespace();
$selectorStart = count($stream->getUsed());
$result = $this->parseElementNode($stream);
$pseudoElement = null;
while (true) {
$peek = $stream->getPeek();
if ($peek->isWhitespace()
|| $peek->isFileEnd()
|| $peek->isDelimiter(array(',', '+', '>', '~'))
|| ($insideNegation && $peek->isDelimiter(array(')')))
) {
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(array('.'))) {
$stream->getNext();
$result = new Node\ClassNode($result, $stream->getNextIdentifier());
} elseif ($peek->isDelimiter(array('['))) {
$stream->getNext();
$result = $this->parseAttributeNode($result, $stream);
} elseif ($peek->isDelimiter(array(':'))) {
$stream->getNext();
if ($stream->getPeek()->isDelimiter(array(':'))) {
$stream->getNext();
$pseudoElement = $stream->getNextIdentifier();
continue;
}
$identifier = $stream->getNextIdentifier();
if (in_array(strtolower($identifier), array('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(array('('))) {
$result = new Node\PseudoNode($result, $identifier);
continue;
}
$stream->getNext();
$stream->skipWhitespace();
if ('not' === strtolower($identifier)) {
if ($insideNegation) {
throw SyntaxErrorException::nestedNot();
}
list($argument, $argumentPseudoElement) = $this->parseSimpleSelector($stream, true);
$next = $stream->getNext();
if (null !== $argumentPseudoElement) {
throw SyntaxErrorException::pseudoElementFound($argumentPseudoElement, 'inside ::not()');
}
if (!$next->isDelimiter(array(')'))) {
throw SyntaxErrorException::unexpectedToken('")"', $next);
}
$result = new Node\NegationNode($result, $argument);
} else {
$arguments = array();
$next = null;
while (true) {
$stream->skipWhitespace();
$next = $stream->getNext();
if ($next->isIdentifier()
|| $next->isString()
|| $next->isNumber()
|| $next->isDelimiter(array('+', '-'))
) {
$arguments[] = $next;
} elseif ($next->isDelimiter(array(')'))) {
break;
} else {
throw SyntaxErrorException::unexpectedToken('an argument', $next);
}
}
if (empty($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', $stream->getPeek());
}
return array($result, $pseudoElement);
}
/**
* Parses next element node.
*
* @param TokenStream $stream
*
* @return Node\ElementNode
*/
private function parseElementNode(TokenStream $stream)
{
$peek = $stream->getPeek();
if ($peek->isIdentifier() || $peek->isDelimiter(array('*'))) {
if ($peek->isIdentifier()) {
$namespace = $stream->getNext()->getValue();
} else {
$stream->getNext();
$namespace = null;
}
if ($stream->getPeek()->isDelimiter(array('|'))) {
$stream->getNext();
$element = $stream->getNextIdentifierOrStar();
} else {
$element = $namespace;
$namespace = null;
}
} else {
$element = $namespace = null;
}
return new Node\ElementNode($namespace, $element);
}
/**
* Parses next attribute node.
*
* @param Node\NodeInterface $selector
* @param TokenStream $stream
*
* @return Node\AttributeNode
*
* @throws SyntaxErrorException
*/
private function parseAttributeNode(Node\NodeInterface $selector, TokenStream $stream)
{
$stream->skipWhitespace();
$attribute = $stream->getNextIdentifierOrStar();
if (null === $attribute && !$stream->getPeek()->isDelimiter(array('|'))) {
throw SyntaxErrorException::unexpectedToken('"|"', $stream->getPeek());
}
if ($stream->getPeek()->isDelimiter(array('|'))) {
$stream->getNext();
if ($stream->getPeek()->isDelimiter(array('='))) {
$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(array(']'))) {
return new Node\AttributeNode($selector, $namespace, $attribute, 'exists', null);
} elseif ($next->isDelimiter(array('='))) {
$operator = '=';
} elseif ($next->isDelimiter(array('^', '$', '*', '~', '|', '!'))
&& $stream->getPeek()->isDelimiter(array('='))
) {
$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(array(']'))) {
throw SyntaxErrorException::unexpectedToken('"]"', $next);
}
return new Node\AttributeNode($selector, $namespace, $attribute, $operator, $value->getValue());
}
}