GraphQL\Language\Parser::parseField PHP Method

    function parseField()
    {
        $start = $this->lexer->token;
        $nameOrAlias = $this->parseName();
        if ($this->skip(Token::COLON)) {
            $alias = $nameOrAlias;
            $name = $this->parseName();
        } else {
            $alias = null;
            $name = $nameOrAlias;
        }
        return new FieldNode(['alias' => $alias, 'name' => $name, 'arguments' => $this->parseArguments(), 'directives' => $this->parseDirectives(), 'selectionSet' => $this->peek(Token::BRACE_L) ? $this->parseSelectionSet() : null, 'loc' => $this->loc($start)]);
    }