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cb151051d79a7ec176e769a33a56e7d906fc1425
libreoffice/tools/source/datetime/tdate.cxx
Mike Kaganski afeff9102c Use even more WIN32_LEAN_AND_MEAN 
Change-Id: I538fe5b41156366e0e87b3a93e58a3947afd18f5
Reviewed-on: https://gerrit.libreoffice.org/42398
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>
2017-09-18 01:13:30 +02:00

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#if defined(_WIN32)
#if !defined WIN32_LEAN_AND_MEAN
# define WIN32_LEAN_AND_MEAN
#endif
#include <windows.h>
#else
#include <time.h>
#endif
#include <tools/date.hxx>
#include <sal/log.hxx>
static const sal_uInt16 aDaysInMonth[12] = { 31, 28, 31, 30, 31, 30,
31, 31, 30, 31, 30, 31 };
// Once upon a time the number of days we internally handled was limited to
// MAX_DAYS 3636532. That changed with a full 16-bit year.
// Assuming the first valid positive date in a proleptic Gregorian calendar is
// 0001-01-01, this resulted in an end date of 9957-06-26.
// Hence we documented that years up to and including 9956 are handled.
/* XXX: it is unclear history why this value was chosen, the representable
* 9999-12-31 would be 3652060 days from 0001-01-01. Even 9998-12-31 to
* distinguish from a maximum possible date would be 3651695.
* There is connectivity/source/commontools/dbconversion.cxx that still has the
* same value to calculate with css::util::Date */
/* XXX can that dbconversion cope with years > 9999 or negative years at all?
* Database fields may be limited to positive 4 digits. */
static const sal_Int32 MIN_DAYS = -11968265; // -32768-01-01
static const sal_Int32 MAX_DAYS = 11967900; // 32767-12-31
namespace
{
const sal_Int16 kYearMax = SAL_MAX_INT16;
const sal_Int16 kYearMin = SAL_MIN_INT16;
// Days until start of year from zero, so month and day of month can be added.
// year 1 => 0 days, year 2 => 365 days, ...
// year -1 => -366 days, year -2 => -731 days, ...
inline sal_Int32 ImpYearToDays( sal_Int16 nYear )
{
assert( nYear != 0 );
sal_Int32 nOffset;
sal_Int32 nYr;
if (nYear < 0)
{
nOffset = -366;
nYr = nYear + 1;
}
else
{
nOffset = 0;
nYr = nYear - 1;
}
return nOffset + nYr*365 + nYr/4 - nYr/100 + nYr/400;
}
inline bool ImpIsLeapYear( sal_Int16 nYear )
{
// Leap years BCE are -1, -5, -9, ...
// See
// https://en.wikipedia.org/wiki/Proleptic_Gregorian_calendar#Usage
// https://en.wikipedia.org/wiki/0_(year)#History_of_astronomical_usage
assert( nYear != 0 );
if (nYear < 0)
nYear = -nYear - 1;
return ( ( ((nYear % 4) == 0) && ((nYear % 100) != 0) ) ||
( (nYear % 400) == 0 ) );
}
// All callers must have sanitized or normalized month and year values!
inline sal_uInt16 ImplDaysInMonth( sal_uInt16 nMonth, sal_Int16 nYear )
{
if ( nMonth != 2 )
return aDaysInMonth[nMonth-1];
else
{
if (ImpIsLeapYear(nYear))
return aDaysInMonth[nMonth-1] + 1;
else
return aDaysInMonth[nMonth-1];
}
}
}
void Date::setDateFromDMY( sal_uInt16 nDay, sal_uInt16 nMonth, sal_Int16 nYear )
{
SAL_WARN_IF( nYear == 0, "tools.datetime", "Date::setDateFromDMY - sure about 0 year? It's not in the calendar.");
assert( nMonth < 100 && "nMonth % 100 not representable" );
assert( nDay < 100 && "nDay % 100 not representable" );
if (nYear < 0)
mnDate =
(static_cast<sal_Int32>( nYear ) * 10000) -
(static_cast<sal_Int32>( nMonth % 100 ) * 100) -
static_cast<sal_Int32>( nDay % 100 );
else
mnDate =
(static_cast<sal_Int32>( nYear ) * 10000) +
(static_cast<sal_Int32>( nMonth % 100 ) * 100) +
static_cast<sal_Int32>( nDay % 100 );
}
void Date::SetDate( sal_Int32 nNewDate )
{
assert( ((nNewDate / 10000) != 0) && "you don't want to set a 0 year, do you?" );
mnDate = nNewDate;
}
// static
sal_uInt16 Date::GetDaysInMonth( sal_uInt16 nMonth, sal_Int16 nYear )
{
SAL_WARN_IF( nMonth < 1 || 12 < nMonth, "tools.datetime", "Date::GetDaysInMonth - nMonth out of bounds " << nMonth);
if (nMonth < 1)
nMonth = 1;
else if (12 < nMonth)
nMonth = 12;
return ImplDaysInMonth( nMonth, nYear);
}
sal_Int32 Date::GetAsNormalizedDays() const
{
// This is a very common datum we often calculate from.
if (mnDate == 18991230) // 1899-12-30
{
assert(DateToDays( GetDay(), GetMonth(), GetYear() ) == 693594);
return 693594;
}
return DateToDays( GetDay(), GetMonth(), GetYear() );
}
sal_Int32 Date::DateToDays( sal_uInt16 nDay, sal_uInt16 nMonth, sal_Int16 nYear )
{
Normalize( nDay, nMonth, nYear);
sal_Int32 nDays = ImpYearToDays(nYear);
for( sal_uInt16 i = 1; i < nMonth; i++ )
nDays += ImplDaysInMonth(i,nYear);
nDays += nDay;
return nDays;
}
static Date lcl_DaysToDate( sal_Int32 nDays )
{
if ( nDays <= MIN_DAYS )
return Date( 1, 1, kYearMin );
if ( nDays >= MAX_DAYS )
return Date( 31, 12, kYearMax );
// Day 0 is -0001-12-31, day 1 is 0001-01-01
const sal_Int16 nSign = (nDays <= 0 ? -1 : 1);
sal_Int32 nTempDays;
sal_Int32 i = 0;
bool bCalc;
sal_Int16 nYear;
do
{
nYear = static_cast<sal_Int16>((nDays / 365) - (i * nSign));
if (nYear == 0)
nYear = nSign;
nTempDays = nDays - ImpYearToDays(nYear);
bCalc = false;
if ( nTempDays < 1 )
{
i += nSign;
bCalc = true;
}
else
{
if ( nTempDays > 365 )
{
if ( (nTempDays != 366) || !ImpIsLeapYear( nYear ) )
{
i -= nSign;
bCalc = true;
}
}
}
}
while ( bCalc );
sal_uInt16 nMonth = 1;
while ( nTempDays > ImplDaysInMonth( nMonth, nYear ) )
{
nTempDays -= ImplDaysInMonth( nMonth, nYear );
++nMonth;
}
return Date( static_cast<sal_uInt16>(nTempDays), nMonth, nYear );
}
Date::Date( DateInitSystem )
{
#if defined(_WIN32)
SYSTEMTIME aDateTime;
GetLocalTime( &aDateTime );
// Combine to date
setDateFromDMY( aDateTime.wDay, aDateTime.wMonth, aDateTime.wYear );
#else
time_t nTmpTime;
struct tm aTime;
// get current time
nTmpTime = time( nullptr );
// compute date
if ( localtime_r( &nTmpTime, &aTime ) )
{
setDateFromDMY( static_cast<sal_uInt16>(aTime.tm_mday),
static_cast<sal_uInt16>(aTime.tm_mon+1),
static_cast<sal_uInt16>(aTime.tm_year+1900) );
}
else
setDateFromDMY( 1, 1, 1900 );
#endif
}
Date::Date( const css::util::DateTime& rDateTime )
{
setDateFromDMY( rDateTime.Day, rDateTime.Month, rDateTime.Year );
}
void Date::SetDay( sal_uInt16 nNewDay )
{
setDateFromDMY( nNewDay, GetMonth(), GetYear() );
}
void Date::SetMonth( sal_uInt16 nNewMonth )
{
setDateFromDMY( GetDay(), nNewMonth, GetYear() );
}
void Date::SetYear( sal_Int16 nNewYear )
{
assert( nNewYear != 0 );
setDateFromDMY( GetDay(), GetMonth(), nNewYear );
}
void Date::AddYears( sal_Int16 nAddYears )
{
sal_Int16 nYear = GetYear();
if (nYear < 0)
{
if (nAddYears < 0)
{
if (nYear < kYearMin - nAddYears)
nYear = kYearMin;
else
nYear += nAddYears;
}
else
{
nYear += nAddYears;
if (nYear == 0)
nYear = 1;
}
}
else
{
if (nAddYears > 0)
{
if (kYearMax - nAddYears < nYear)
nYear = kYearMax;
else
nYear += nAddYears;
}
else
{
nYear += nAddYears;
if (nYear == 0)
nYear = -1;
}
}
SetYear( nYear );
if (GetMonth() == 2 && GetDay() == 29 && !ImpIsLeapYear( nYear))
SetDay(28);
}
void Date::AddMonths( sal_Int32 nAddMonths )
{
sal_Int32 nMonths = GetMonth() + nAddMonths;
sal_Int32 nNewMonth = nMonths % 12;
sal_Int32 nYear = GetYear() + nMonths / 12;
if( nMonths <= 0 || nNewMonth == 0 )
--nYear;
if( nNewMonth <= 0 )
nNewMonth += 12;
if (nYear == 0)
nYear = (nAddMonths < 0 ? -1 : 1);
else if (nYear < kYearMin)
nYear = kYearMin;
else if (nYear > kYearMax)
nYear = kYearMax;
SetMonth( static_cast<sal_uInt16>(nNewMonth) );
SetYear( static_cast<sal_Int16>(nYear) );
Normalize();
}
DayOfWeek Date::GetDayOfWeek() const
{
return static_cast<DayOfWeek>((GetAsNormalizedDays()-1) % 7);
}
sal_uInt16 Date::GetDayOfYear() const
{
sal_uInt16 nDay = GetDay();
sal_uInt16 nMonth = GetMonth();
sal_Int16 nYear = GetYear();
Normalize( nDay, nMonth, nYear);
for( sal_uInt16 i = 1; i < nMonth; i++ )
nDay += ::ImplDaysInMonth( i, nYear );
return nDay;
}
sal_uInt16 Date::GetWeekOfYear( DayOfWeek eStartDay,
sal_Int16 nMinimumNumberOfDaysInWeek ) const
{
short nWeek;
short n1WDay = (short)Date( 1, 1, GetYear() ).GetDayOfWeek();
short nDayOfYear = (short)GetDayOfYear();
// weekdays start at 0, thus decrement one
nDayOfYear--;
// account for StartDay
n1WDay = (n1WDay+(7-(short)eStartDay)) % 7;
if (nMinimumNumberOfDaysInWeek < 1 || 7 < nMinimumNumberOfDaysInWeek)
{
SAL_WARN( "tools.datetime", "Date::GetWeekOfYear: invalid nMinimumNumberOfDaysInWeek" );
nMinimumNumberOfDaysInWeek = 4;
}
if ( nMinimumNumberOfDaysInWeek == 1 )
{
nWeek = ((n1WDay+nDayOfYear)/7) + 1;
// Set to 53rd week only if we're not in the
// first week of the new year
if ( nWeek == 54 )
nWeek = 1;
else if ( nWeek == 53 )
{
short nDaysInYear = (short)GetDaysInYear();
short nDaysNextYear = (short)Date( 1, 1, GetNextYear() ).GetDayOfWeek();
nDaysNextYear = (nDaysNextYear+(7-(short)eStartDay)) % 7;
if ( nDayOfYear > (nDaysInYear-nDaysNextYear-1) )
nWeek = 1;
}
}
else if ( nMinimumNumberOfDaysInWeek == 7 )
{
nWeek = ((n1WDay+nDayOfYear)/7);
// First week of a year is equal to the last week of the previous year
if ( nWeek == 0 )
{
Date aLastDatePrevYear( 31, 12, GetPrevYear() );
nWeek = aLastDatePrevYear.GetWeekOfYear( eStartDay, nMinimumNumberOfDaysInWeek );
}
}
else // ( nMinimumNumberOfDaysInWeek == somehing_else, commentary examples for 4 )
{
// x_monday - thursday
if ( n1WDay < nMinimumNumberOfDaysInWeek )
nWeek = 1;
// Friday
else if ( n1WDay == nMinimumNumberOfDaysInWeek )
nWeek = 53;
// Saturday
else if ( n1WDay == nMinimumNumberOfDaysInWeek + 1 )
{
// Year after leapyear
if ( Date( 1, 1, GetPrevYear() ).IsLeapYear() )
nWeek = 53;
else
nWeek = 52;
}
// Sunday
else
nWeek = 52;
if ( (nWeek == 1) || (nDayOfYear + n1WDay > 6) )
{
if ( nWeek == 1 )
nWeek += (nDayOfYear + n1WDay) / 7;
else
nWeek = (nDayOfYear + n1WDay) / 7;
if ( nWeek == 53 )
{
// next x_Sunday == first x_Sunday in the new year
// == still the same week!
sal_Int32 nTempDays = GetAsNormalizedDays();
nTempDays += 6 - (GetDayOfWeek()+(7-(short)eStartDay)) % 7;
nWeek = lcl_DaysToDate( nTempDays ).GetWeekOfYear( eStartDay, nMinimumNumberOfDaysInWeek );
}
}
}
return (sal_uInt16)nWeek;
}
sal_uInt16 Date::GetDaysInMonth() const
{
sal_uInt16 nDay = GetDay();
sal_uInt16 nMonth = GetMonth();
sal_Int16 nYear = GetYear();
Normalize( nDay, nMonth, nYear);
return ImplDaysInMonth( nMonth, nYear );
}
bool Date::IsLeapYear() const
{
sal_Int16 nYear = GetYear();
return ImpIsLeapYear( nYear );
}
bool Date::IsValidAndGregorian() const
{
sal_uInt16 nDay = GetDay();
sal_uInt16 nMonth = GetMonth();
sal_Int16 nYear = GetYear();
if ( !nMonth || (nMonth > 12) )
return false;
if ( !nDay || (nDay > ImplDaysInMonth( nMonth, nYear )) )
return false;
else if ( nYear <= 1582 )
{
if ( nYear < 1582 )
return false;
else if ( nMonth < 10 )
return false;
else if ( (nMonth == 10) && (nDay < 15) )
return false;
}
return true;
}
bool Date::IsValidDate() const
{
return IsValidDate( GetDay(), GetMonth(), GetYear());
}
//static
bool Date::IsValidDate( sal_uInt16 nDay, sal_uInt16 nMonth, sal_Int16 nYear )
{
if (nYear == 0)
return false;
if ( !nMonth || (nMonth > 12) )
return false;
if ( !nDay || (nDay > ImplDaysInMonth( nMonth, nYear )) )
return false;
return true;
}
bool Date::Normalize()
{
sal_uInt16 nDay = GetDay();
sal_uInt16 nMonth = GetMonth();
sal_Int16 nYear = GetYear();
if (!Normalize( nDay, nMonth, nYear))
return false;
setDateFromDMY( nDay, nMonth, nYear );
return true;
}
//static
bool Date::Normalize( sal_uInt16 & rDay, sal_uInt16 & rMonth, sal_Int16 & rYear )
{
if (IsValidDate( rDay, rMonth, rYear))
return false;
if (rDay == 0 && rMonth == 0 && rYear == 0)
return false; // empty date
if (rDay == 0)
{
if (rMonth == 0)
; // nothing, handled below
else
--rMonth;
// Last day of month is determined at the end.
}
if (rMonth > 12)
{
rYear += rMonth / 12;
rMonth = rMonth % 12;
if (rYear == 0)
rYear = 1;
}
if (rMonth == 0)
{
--rYear;
if (rYear == 0)
rYear = -1;
rMonth = 12;
}
if (rYear < 0)
{
sal_uInt16 nDays;
while (rDay > (nDays = ImplDaysInMonth( rMonth, rYear)))
{
rDay -= nDays;
if (rMonth > 1)
--rMonth;
else
{
if (rYear == kYearMin)
{
rDay = 1;
rMonth = 1;
return true;
}
--rYear;
rMonth = 12;
}
}
}
else
{
sal_uInt16 nDays;
while (rDay > (nDays = ImplDaysInMonth( rMonth, rYear)))
{
rDay -= nDays;
if (rMonth < 12)
++rMonth;
else
{
if (rYear == kYearMax)
{
rDay = 31;
rMonth = 12;
return true;
}
++rYear;
rMonth = 1;
}
}
}
if (rDay == 0)
rDay = ImplDaysInMonth( rMonth, rYear);
return true;
}
void Date::AddDays( sal_Int32 nDays )
{
if (nDays != 0)
*this = lcl_DaysToDate( GetAsNormalizedDays() + nDays );
}
Date& Date::operator ++()
{
*this = lcl_DaysToDate( GetAsNormalizedDays() + 1 );
return *this;
}
Date& Date::operator --()
{
*this = lcl_DaysToDate( GetAsNormalizedDays() - 1 );
return *this;
}
Date operator +( const Date& rDate, sal_Int32 nDays )
{
Date aDate( rDate );
aDate.AddDays( nDays );
return aDate;
}
Date operator -( const Date& rDate, sal_Int32 nDays )
{
Date aDate( rDate );
aDate.AddDays( -nDays );
return aDate;
}
sal_Int32 operator -( const Date& rDate1, const Date& rDate2 )
{
return rDate1.GetAsNormalizedDays() - rDate2.GetAsNormalizedDays();
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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