Symfony\Component\CssSelector\Parser::parseSimpleSelector PHP Метод

    protected function parseSimpleSelector($stream)
    {
        $peek = $stream->peek();
        if ($peek != '*' && !$peek->isType('Symbol')) {
            $element = $namespace = '*';
        } else {
            $next = $stream->next();
            if ($next != '*' && !$next->isType('Symbol')) {
                throw new SyntaxError(sprintf("Expected symbol, got '%s'", $next));
            }
            if ($stream->peek() == '|') {
                $namespace = $next;
                $stream->next();
                $element = $stream->next();
                if ($element != '*' && !$next->isType('Symbol')) {
                    throw new SyntaxError(sprintf("Expected symbol, got '%s'", $next));
                }
            } else {
                $namespace = '*';
                $element = $next;
            }
        }
        $result = new Node\ElementNode($namespace, $element);
        $has_hash = false;
        while (1) {
            $peek = $stream->peek();
            if ($peek == '#') {
                if ($has_hash) {
                    /* You can't have two hashes
                       (FIXME: is there some more general rule I'm missing?) */
                    // @codeCoverageIgnoreStart
                    break;
                    // @codeCoverageIgnoreEnd
                }
                $stream->next();
                $result = new Node\HashNode($result, $stream->next());
                $has_hash = true;
                continue;
            } elseif ($peek == '.') {
                $stream->next();
                $result = new Node\ClassNode($result, $stream->next());
                continue;
            } elseif ($peek == '[') {
                $stream->next();
                $result = $this->parseAttrib($result, $stream);
                $next = $stream->next();
                if ($next != ']') {
                    throw new SyntaxError(sprintf("] expected, got '%s'", $next));
                }
                continue;
            } elseif ($peek == ':' || $peek == '::') {
                $type = $stream->next();
                $ident = $stream->next();
                if (!$ident || !$ident->isType('Symbol')) {
                    throw new SyntaxError(sprintf("Expected symbol, got '%s'", $ident));
                }
                if ($stream->peek() == '(') {
                    $stream->next();
                    $peek = $stream->peek();
                    if ($peek->isType('String')) {
                        $selector = $stream->next();
                    } elseif ($peek->isType('Symbol') && is_int($peek)) {
                        $selector = intval($stream->next());
                    } else {
                        // FIXME: parseSimpleSelector, or selector, or...?
                        $selector = $this->parseSimpleSelector($stream);
                    }
                    $next = $stream->next();
                    if ($next != ')') {
                        throw new SyntaxError(sprintf("Expected ')', got '%s' and '%s'", $next, $selector));
                    }
                    $result = new Node\FunctionNode($result, $type, $ident, $selector);
                } else {
                    $result = new Node\PseudoNode($result, $type, $ident);
                }
                continue;
            } else {
                if ($peek == ' ') {
                    $stream->next();
                }
                break;
            }
            // FIXME: not sure what "negation" is
        }
        return $result;
    }