43         $stream = $this->tokenizer->tokenize($reader);
45         return $this->parseSelectorList($stream);
95     private function parseSelectorList(TokenStream $stream): array  argument
97         $stream->skipWhitespace();
101             $selectors[] = $this->parserSelectorNode($stream);
103             if ($stream->getPeek()->isDelimiter([','])) {
104                 $stream->getNext();
105                 $stream->skipWhitespace();
114     private function parserSelectorNode(TokenStream $stream): Node\SelectorNode  argument
116         [$result, $pseudoElement] = $this->parseSimpleSelector($stream);
119             $stream->skipWhitespace();
120             $peek = $stream->getPeek();
131                 $combinator = $stream->getNext()->getValue();
132                 $stream->skipWhitespace();
137             [$nextSelector, $pseudoElement] = $this->parseSimpleSelector($stream);
149     private function parseSimpleSelector(TokenStream $stream, bool $insideNegation = false): array  argument
151         $stream->skipWhitespace();
153         $selectorStart = \count($stream->getUsed());
154         $result = $this->parseElementNode($stream);
158             $peek = $stream->getPeek();
172                 $result = new Node\HashNode($result, $stream->getNext()->getValue());
174                 $stream->getNext();
175                 $result = new Node\ClassNode($result, $stream->getNextIdentifier());
177                 $stream->getNext();
178                 $result = $this->parseAttributeNode($result, $stream);
180                 $stream->getNext();
182                 if ($stream->getPeek()->isDelimiter([':'])) {
183                     $stream->getNext();
184                     $pseudoElement = $stream->getNextIdentifier();
189                 $identifier = $stream->getNextIdentifier();
198                 if (!$stream->getPeek()->isDelimiter(['('])) {
204                 $stream->getNext();
205                 $stream->skipWhitespace();
212                     [$argument, $argumentPseudoElement] = $this->parseSimpleSelector($stream, true);
213                     $next = $stream->getNext();
229                         $stream->skipWhitespace();
230                         $next = $stream->getNext();
256         if (\count($stream->getUsed()) === $selectorStart) {
257             throw SyntaxErrorException::unexpectedToken('selector', $stream->getPeek());
263     private function parseElementNode(TokenStream $stream): Node\ElementNode  argument
265         $peek = $stream->getPeek();
269                 $namespace = $stream->getNext()->getValue();
271                 $stream->getNext();
275             if ($stream->getPeek()->isDelimiter(['|'])) {
276                 $stream->getNext();
277                 $element = $stream->getNextIdentifierOrStar();
289 …private function parseAttributeNode(Node\NodeInterface $selector, TokenStream $stream): Node\Attri…  argument
291         $stream->skipWhitespace();
292         $attribute = $stream->getNextIdentifierOrStar();
294         if (null === $attribute && !$stream->getPeek()->isDelimiter(['|'])) {
295             throw SyntaxErrorException::unexpectedToken('"|"', $stream->getPeek());
298         if ($stream->getPeek()->isDelimiter(['|'])) {
299             $stream->getNext();
301             if ($stream->getPeek()->isDelimiter(['='])) {
303                 $stream->getNext();
307                 $attribute = $stream->getNextIdentifier();
315             $stream->skipWhitespace();
316             $next = $stream->getNext();
323                 && $stream->getPeek()->isDelimiter(['='])
326                 $stream->getNext();
332         $stream->skipWhitespace();
333         $value = $stream->getNext();
344         $stream->skipWhitespace();
345         $next = $stream->getNext();