mirror of https://github.com/tfussell/xlnt
100 lines
3.4 KiB
C++
100 lines
3.4 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/timedelta.hpp>
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namespace xlnt {
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timedelta::timedelta()
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: timedelta(0, 0, 0, 0, 0)
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{
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}
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timedelta::timedelta(int days_, int hours_, int minutes_, int seconds_, int microseconds_)
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: days(days_), hours(hours_), minutes(minutes_), seconds(seconds_), microseconds(microseconds_)
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{
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}
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long double timedelta::to_number() const
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{
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std::uint64_t total_microseconds = static_cast<std::uint64_t>(microseconds);
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total_microseconds += static_cast<std::uint64_t>(seconds * 1e6);
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total_microseconds += static_cast<std::uint64_t>(minutes * 1e6 * 60);
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auto microseconds_per_hour = static_cast<std::uint64_t>(1e6) * 60 * 60;
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total_microseconds += static_cast<std::uint64_t>(hours) * microseconds_per_hour;
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auto number = total_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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number += days;
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return number;
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}
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timedelta timedelta::from_number(long double raw_time)
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{
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timedelta result;
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result.days = static_cast<int>(raw_time);
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long double fractional_part = raw_time - result.days;
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fractional_part *= 24;
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result.hours = static_cast<int>(fractional_part);
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fractional_part = 60 * (fractional_part - result.hours);
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result.minutes = static_cast<int>(fractional_part);
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fractional_part = 60 * (fractional_part - result.minutes);
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result.seconds = static_cast<int>(fractional_part);
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fractional_part = 1000000 * (fractional_part - result.seconds);
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result.microseconds = static_cast<int>(fractional_part);
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if (result.microseconds == 999999 && fractional_part - result.microseconds > 0.5L)
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{
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result.microseconds = 0;
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result.seconds += 1;
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if (result.seconds == 60)
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{
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result.seconds = 0;
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result.minutes += 1;
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// TODO: too much nesting
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if (result.minutes == 60)
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{
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result.minutes = 0;
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result.hours += 1;
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if (result.hours == 24)
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{
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result.hours = 0;
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result.days += 1;
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}
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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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} // namespace xlnt
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