360 lines
12 KiB
PHP
360 lines
12 KiB
PHP
|
<?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/scrapy/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(fn (Token $token) => $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);
|
||
|
|
if ('Pseudo[Element[*]:scope]' === $result->__toString()) {
|
||
|
|
$used = \count($stream->getUsed());
|
||
|
|
if (!(2 === $used
|
||
|
|
|| 3 === $used && $stream->getUsed()[0]->isWhiteSpace()
|
||
|
|
|| $used >= 3 && $stream->getUsed()[$used - 3]->isDelimiter([','])
|
||
|
|
|| $used >= 4
|
||
|
|
&& $stream->getUsed()[$used - 3]->isWhiteSpace()
|
||
|
|
&& $stream->getUsed()[$used - 4]->isDelimiter([','])
|
||
|
|
)) {
|
||
|
|
throw SyntaxErrorException::notAtTheStartOfASelector('scope');
|
||
|
|
}
|
||
|
|
}
|
||
|
|
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());
|
||
|
|
}
|
||
|
|
}
|