Automattic\WooCommerce\Vendor\GraphQL\Language

Parser::expect │ private │ WC 1.0

If the next token is of the given kind, return that token after advancing the parser. Otherwise, do not change the parser state and return false.

Method of the class: Parser{}

No Hooks.

Returns

null. Nothing (null).

Usage

// private - for code of main (parent) class only
$result = $this->expect( $kind ): Token;
$kind(string) (required)
.

Parser::expect() code WC 11.0.1

woocommerce/lib/packages/GraphQL/Language/Parser.php 
private function expect(string $kind): Token
{
    $token = $this->lexer->token;

    if ($token->kind === $kind) {
        $this->lexer->advance();

        return $token;
    }

    throw new SyntaxError($this->lexer->source, $token->start, "Expected {$kind}, found {$token->getDescription()}");
}