mirror of https://github.com/tfussell/xlnt
134 lines
4.2 KiB
C++
134 lines
4.2 KiB
C++
// Copyright (c) 2014-2016 Thomas Fussell
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, WRISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE
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//
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// @license: http://www.opensource.org/licenses/mit-license.php
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// @author: see AUTHORS file
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#include <cmath>
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#include <ctime>
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#include <xlnt/utils/time.hpp>
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namespace {
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std::tm safe_localtime(std::time_t raw_time)
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{
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#ifdef _MSC_VER
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std::tm result;
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localtime_s(&result, &raw_time);
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return result;
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#else
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return *localtime(&raw_time);
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#endif
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}
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} // namespace
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namespace xlnt {
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time time::from_number(long double raw_time)
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{
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time result;
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double integer_part;
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double fractional_part = std::modf(static_cast<double>(raw_time), &integer_part);
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fractional_part *= 24;
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result.hour = static_cast<int>(fractional_part);
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fractional_part = 60 * (fractional_part - result.hour);
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result.minute = static_cast<int>(fractional_part);
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fractional_part = 60 * (fractional_part - result.minute);
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result.second = static_cast<int>(fractional_part);
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fractional_part = 1000000 * (fractional_part - result.second);
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result.microsecond = static_cast<int>(fractional_part);
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if (result.microsecond == 999999 && fractional_part - result.microsecond > 0.5)
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{
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result.microsecond = 0;
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result.second += 1;
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if (result.second == 60)
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{
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result.second = 0;
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result.minute += 1;
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// TODO: too much nesting
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if (result.minute == 60)
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{
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result.minute = 0;
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result.hour += 1;
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}
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}
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}
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return result;
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}
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time::time(int hour_, int minute_, int second_, int microsecond_)
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: hour(hour_), minute(minute_), second(second_), microsecond(microsecond_)
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{
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}
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bool time::operator==(const time &comparand) const
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{
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return hour == comparand.hour && minute == comparand.minute && second == comparand.second
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&& microsecond == comparand.microsecond;
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}
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time::time(const std::string &time_string)
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: hour(0), minute(0), second(0), microsecond(0)
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{
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std::string remaining = time_string;
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auto colon_index = remaining.find(':');
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hour = std::stoi(remaining.substr(0, colon_index));
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remaining = remaining.substr(colon_index + 1);
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colon_index = remaining.find(':');
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minute = std::stoi(remaining.substr(0, colon_index));
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colon_index = remaining.find(':');
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if (colon_index != std::string::npos)
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{
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remaining = remaining.substr(colon_index + 1);
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second = std::stoi(remaining);
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}
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}
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long double time::to_number() const
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{
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std::uint64_t microseconds = static_cast<std::uint64_t>(microsecond);
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microseconds += static_cast<std::uint64_t>(second * 1e6);
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microseconds += static_cast<std::uint64_t>(minute * 1e6 * 60);
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auto microseconds_per_hour = static_cast<std::uint64_t>(1e6) * 60 * 60;
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microseconds += static_cast<std::uint64_t>(hour) * microseconds_per_hour;
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auto number = microseconds / (24.0L * microseconds_per_hour);
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auto hundred_billion = static_cast<std::uint64_t>(1e9) * 100;
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number = std::floor(number * hundred_billion + 0.5L) / hundred_billion;
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return number;
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}
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time time::now()
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{
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std::tm now = safe_localtime(std::time(0));
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return time(now.tm_hour, now.tm_min, now.tm_sec);
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}
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} // namespace xlnt
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