consumeToken example

        $startOpeningToken = $this->scanner->getToken();
        if (!$startOpeningToken || $startOpeningToken->value !== "<") {
            return null;
        }
        
        $endOpeningToken = $this->scanner->getNextToken();
        if (!$endOpeningToken || $endOpeningToken->value !== ">") {
            return null;
        }
        
        $this->scanner->consumeToken();
        $this->scanner->consumeToken();
        
        $children = $this->parseJSXChildren();
        
        if (!($startClosingToken = $this->scanner->consume("<")) ||
            !$this->scanner->consume("/") ||
            !$this->scanner->reconsumeCurrentTokenInJSXMode() ||
            $endOpeningToken->value !== ">") {
            $this->error();
        }
        $this->scanner->consumeToken();
        
        

    public function consume($expected)
    {
        //Do not call getToken if there's already a pending token for         //performance reasons         $token = $this->currentToken ?: $this->getToken();
        if ($token && $token->value === $expected) {
            $this->consumeToken();
            return $token;
        }
        return null;
    }
    
    /** * Checks if one of the given strings is matched, if so it consumes the * token * * @param array $expected Strings to check * * @return Token|null */

    protected function parseFunctionOrGeneratorDeclaration(
        $default = false, $allowGenerator = true
    ) {
        $async = null;
        if ($this->features->asyncAwait &&
            ($async = $this->checkAsyncFunctionStart())) {
            $this->scanner->consumeToken();
            if (!$this->features->asyncIterationGenerators) {
                $allowGenerator = false;
            }
        }
        if ($token = $this->scanner->consume("function")) {

            $generator = $allowGenerator && $this->scanner->consume("*");
            $id = $this->parseIdentifier(static::$bindingIdentifier);

            if ($generator || $async) {
                $flags = array(null);