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Edit File : Parser.php \| Size : 11.35 KB
<?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; public function __construct(Tokenizer $tokenizer = null) { $this->tokenizer = $tokenizer ?? new Tokenizer(); } /* * {@inheritdoc} / 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' === $joined: return [1, 0]; case false === strpos($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', $next); } } if (empty($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', $stream->getPeek()); } return [$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()); } } Back

Edit File : Parser.php | Size : 11.35 KB

<?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;

public function __construct(Tokenizer $tokenizer = null)
    {
        $this->tokenizer = $tokenizer ?? new Tokenizer();
    }

/**
     * {@inheritdoc}
     */
    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' === $joined:
                return [1, 0];
            case false === strpos($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 (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 [$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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