Method parse_time

src/toml.hpp:14459–14543

		TOML_NODISCARD
		TOML_NEVER_INLINE
		time parse_time(bool part_of_datetime = false)
		{
			return_if_error({});
			assert_not_eof();
			TOML_ASSERT_ASSUME(is_decimal_digit(*cp));
			push_parse_scope("time"sv);

			static constexpr size_t max_digits = 64; // far more than necessary but needed to allow fractional
													 // millisecond truncation per the spec
			uint32_t digits[max_digits];

			// "HH"
			if (!consume_digit_sequence(digits, 2u))
				set_error_and_return_default("expected 2-digit hour, saw '"sv, to_sv(cp), "'"sv);
			const auto hour = digits[1] + digits[0] * 10u;
			if (hour > 23u)
				set_error_and_return_default("expected hour between 0 to 59 (inclusive), saw "sv, hour);
			set_error_and_return_if_eof({});

			// ':'
			if (*cp != U':')
				set_error_and_return_default("expected ':', saw '"sv, to_sv(*cp), "'"sv);
			advance_and_return_if_error_or_eof({});

			// "MM"
			if (!consume_digit_sequence(digits, 2u))
				set_error_and_return_default("expected 2-digit minute, saw '"sv, to_sv(cp), "'"sv);
			const auto minute = digits[1] + digits[0] * 10u;
			if (minute > 59u)
				set_error_and_return_default("expected minute between 0 and 59 (inclusive), saw "sv, minute);
			auto time = toml::time{ hour, minute };

			// ':'
			if constexpr (TOML_LANG_UNRELEASED) // toml/issues/671 (allow omission of seconds)
			{
				if (is_eof() || is_value_terminator(*cp) || (part_of_datetime && is_match(*cp, U'+', U'-', U'Z', U'z')))
					return time;
			}
			else
				set_error_and_return_if_eof({});
			if (*cp != U':')
				set_error_and_return_default("expected ':', saw '"sv, to_sv(*cp), "'"sv);
			advance_and_return_if_error_or_eof({});

			// "SS"
			if (!consume_digit_sequence(digits, 2u))
				set_error_and_return_default("expected 2-digit second, saw '"sv, to_sv(cp), "'"sv);
			const auto second = digits[1] + digits[0] * 10u;
			if (second > 59u)
				set_error_and_return_default("expected second between 0 and 59 (inclusive), saw "sv, second);
			time.second = static_cast<decltype(time.second)>(second);

			// '.' (early-exiting is allowed; fractional is optional)
			if (is_eof() || is_value_terminator(*cp) || (part_of_datetime && is_match(*cp, U'+', U'-', U'Z', U'z')))
				return time;
			if (*cp != U'.')
				set_error_and_return_default("expected '.', saw '"sv, to_sv(*cp), "'"sv);
			advance_and_return_if_error_or_eof({});