xlnt/source/utils/time.cpp
2018-01-22 09:38:48 -05:00

134 lines
4.2 KiB
C++

// Copyright (c) 2014-2018 Thomas Fussell
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, WRISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE
//
// @license: http://www.opensource.org/licenses/mit-license.php
// @author: see AUTHORS file
#include <cmath>
#include <ctime>
#include <xlnt/utils/time.hpp>
namespace {
std::tm safe_localtime(std::time_t raw_time)
{
#ifdef _MSC_VER
std::tm result;
localtime_s(&result, &raw_time);
return result;
#else
return *localtime(&raw_time);
#endif
}
} // namespace
namespace xlnt {
time time::from_number(double raw_time)
{
time result;
double integer_part;
double fractional_part = std::modf(static_cast<double>(raw_time), &integer_part);
fractional_part *= 24;
result.hour = static_cast<int>(fractional_part);
fractional_part = 60 * (fractional_part - result.hour);
result.minute = static_cast<int>(fractional_part);
fractional_part = 60 * (fractional_part - result.minute);
result.second = static_cast<int>(fractional_part);
fractional_part = 1000000 * (fractional_part - result.second);
result.microsecond = static_cast<int>(fractional_part);
if (result.microsecond == 999999 && fractional_part - result.microsecond > 0.5)
{
result.microsecond = 0;
result.second += 1;
if (result.second == 60)
{
result.second = 0;
result.minute += 1;
// TODO: too much nesting
if (result.minute == 60)
{
result.minute = 0;
result.hour += 1;
}
}
}
return result;
}
time::time(int hour_, int minute_, int second_, int microsecond_)
: hour(hour_), minute(minute_), second(second_), microsecond(microsecond_)
{
}
bool time::operator==(const time &comparand) const
{
return hour == comparand.hour && minute == comparand.minute && second == comparand.second
&& microsecond == comparand.microsecond;
}
time::time(const std::string &time_string)
: hour(0), minute(0), second(0), microsecond(0)
{
std::string remaining = time_string;
auto colon_index = remaining.find(':');
hour = std::stoi(remaining.substr(0, colon_index));
remaining = remaining.substr(colon_index + 1);
colon_index = remaining.find(':');
minute = std::stoi(remaining.substr(0, colon_index));
colon_index = remaining.find(':');
if (colon_index != std::string::npos)
{
remaining = remaining.substr(colon_index + 1);
second = std::stoi(remaining);
}
}
double time::to_number() const
{
std::uint64_t microseconds = static_cast<std::uint64_t>(microsecond);
microseconds += static_cast<std::uint64_t>(second * 1e6);
microseconds += static_cast<std::uint64_t>(minute * 1e6 * 60);
auto microseconds_per_hour = static_cast<std::uint64_t>(1e6) * 60 * 60;
microseconds += static_cast<std::uint64_t>(hour) * microseconds_per_hour;
auto number = microseconds / (24.0 * microseconds_per_hour);
auto hundred_billion = static_cast<std::uint64_t>(1e9) * 100;
number = std::floor(number * hundred_billion + 0.5) / hundred_billion;
return number;
}
time time::now()
{
std::tm now = safe_localtime(std::time(nullptr));
return time(now.tm_hour, now.tm_min, now.tm_sec);
}
} // namespace xlnt