GraphQL\Language\Parser::parseArgument PHP Method

    function parseArgument()
    {
        $start = $this->lexer->token;
        $name = $this->parseName();
        $this->expect(Token::COLON);
        $value = $this->parseValueLiteral(false);
        return new ArgumentNode(['name' => $name, 'value' => $value, 'loc' => $this->loc($start)]);
    }