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/******************************************************************************
*
* Copyright (C) 1997-2022 by Dimitri van Heesch.
*
* Permission to use, copy, modify, and distribute this software and its
* documentation under the terms of the GNU General Public License is hereby
* granted. No representations are made about the suitability of this software
* for any purpose. It is provided "as is" without express or implied warranty.
* See the GNU General Public License for more details.
*
* Documents produced by Doxygen are derivative works derived from the
* input used in their production; they are not affected by this license.
*
*/
#include <cstdlib>
#include <chrono>
#include <memory>
#include <array>
#include <functional>
#include "regex.h"
#include "datetime.h"
#include "config.h"
#include "portable.h"
#include "language.h"
#include "message.h"
#include "growbuf.h"
std::tm getCurrentDateTime()
{
QCString sourceDateEpoch = Portable::getenv("SOURCE_DATE_EPOCH");
if (!sourceDateEpoch.isEmpty()) // see https://reproducible-builds.org/specs/source-date-epoch/
{
bool ok;
uint64 epoch = sourceDateEpoch.toUInt64(&ok);
if (!ok)
{
static bool warnedOnce=FALSE;
if (!warnedOnce)
{
warn_uncond("Environment variable SOURCE_DATE_EPOCH does not contain a valid number; value is '%s'\n",
qPrint(sourceDateEpoch));
warnedOnce=TRUE;
}
}
else // use given epoch value as current 'built' time
{
auto epoch_start = std::chrono::time_point<std::chrono::system_clock>{};
auto epoch_seconds = std::chrono::seconds(epoch);
auto build_time = epoch_start + epoch_seconds;
std::time_t time = std::chrono::system_clock::to_time_t(build_time);
return *gmtime(&time);
}
}
// return current local time
auto now = std::chrono::system_clock::now();
std::time_t time = std::chrono::system_clock::to_time_t(now);
return *localtime(&time);
}
QCString dateToString(bool includeTime)
{
auto current = getCurrentDateTime();
return theTranslator->trDateTime(current.tm_year + 1900,
current.tm_mon + 1,
current.tm_mday,
(current.tm_wday+6)%7+1, // map: Sun=0..Sat=6 to Mon=1..Sun=7
current.tm_hour,
current.tm_min,
current.tm_sec,
includeTime);
}
QCString yearToString()
{
auto current = getCurrentDateTime();
return QCString().setNum(current.tm_year+1900);
}
struct SpecFormat
{
const reg::Ex re;
int count;
int offset;
int format;
};
using TMFieldAssigner = std::function< void(std::tm &,int value) >;
struct DateTimeField
{
TMFieldAssigner assigner;
int minVal;
int maxVal;
const char *name;
};
static std::array<SpecFormat,5> g_specFormats
{{
// regular expression, num values, offset, format bits
{ std::string(R"((\d+)-(\d+)-(\d+)\s*(\d+):(\d+):(\d+))"), 6, 0, SF_Date|SF_Time|SF_Seconds }, // format 13-04-2015 12:34:56
{ std::string(R"((\d+)-(\d+)-(\d+)\s*(\d+):(\d+))"), 5, 0, SF_Date|SF_Time }, // format 13-04-2015 12:34
{ std::string(R"((\d+)-(\d+)-(\d+))"), 3, 0, SF_Date }, // format 13-04-2015
{ std::string(R"((\d+):(\d+):(\d+))"), 3, 3, SF_Time|SF_Seconds }, // format 12:34:56
{ std::string(R"((\d+):(\d+))"), 2, 3, SF_Time } // format 12:34
}};
static std::array<DateTimeField,6> g_assignValues
{{
// assigner, minVal, maxVal, name
{ [](std::tm &tm,int value) { tm.tm_year = value-1900; }, 1900, 9999, "year" },
{ [](std::tm &tm,int value) { tm.tm_mon = value-1; }, 1, 12, "month" },
{ [](std::tm &tm,int value) { tm.tm_mday = value; }, 1, 31, "day" },
{ [](std::tm &tm,int value) { tm.tm_hour = value; }, 0, 23, "hour" },
{ [](std::tm &tm,int value) { tm.tm_min = value; }, 0, 59, "minute" },
{ [](std::tm &tm,int value) { tm.tm_sec = value; }, 0, 59, "second" }
}};
static void determine_weekday( std::tm& tm )
{
auto cpy = tm;
// there are some problems when the hr:min:sec are on 00:00:00 in determining the weekday
cpy.tm_hour = 12;
const auto as_time_t = std::mktime( &cpy ) ;
if (as_time_t != -1)
{
cpy = *std::localtime( &as_time_t ) ;
tm.tm_wday = cpy.tm_wday;
}
}
QCString dateTimeFromString(const QCString &spec,std::tm &dt,int &format)
{
// for an empty spec field return the current date and time
dt = getCurrentDateTime();
if (spec.isEmpty())
{
format = SF_Date | SF_Time | SF_Seconds;
return QCString();
}
// find a matching pattern
std::string s = spec.str();
for (const auto &fmt : g_specFormats)
{
reg::Match m;
if (reg::match(s,m,fmt.re)) // match found
{
for (int i=0; i<fmt.count; i++)
{
int value = std::atoi(m[i+1].str().c_str());
const DateTimeField &dtf = g_assignValues[i+fmt.offset];
if (value<dtf.minVal || value>dtf.maxVal) // check if the value is in the expected range
{
return QCString().sprintf("value for %s is %d which is outside of the value range [%d..%d]",
dtf.name, value, dtf.minVal, dtf.maxVal);
}
dtf.assigner(dt,value);
}
format = fmt.format;
if (format&SF_Date) // if we have a date also determine the weekday
{
determine_weekday(dt);
}
return QCString();
}
}
// no matching pattern found
return "invalid or non representable date/time argument";
}
QCString formatDateTime(const QCString &format,const std::tm &dt,int &formatUsed)
{
formatUsed = 0;
auto getYear = [](const std::tm &dat) { return dat.tm_year+1900; };
auto getMonth = [](const std::tm &dat) { return dat.tm_mon+1; };
auto getDay = [](const std::tm &dat) { return dat.tm_mday; };
auto getDayOfWeek = [](const std::tm &dat) { return (dat.tm_wday+6)%7+1; };
GrowBuf growBuf;
char c;
const char *p = format.data();
const char *fmt_zero = "%02d";
const char *fmt_nonzero = "%d";
const char *fmt_selected = 0;
if (p==0) return QCString();
while ((c=*p++))
{
char nc = *p;
switch (c)
{
case '%':
fmt_selected = nc=='-' ? fmt_nonzero : fmt_zero; // %-H produces 1 and %H produces 01
if (nc=='-') nc=*++p; // skip over -
switch (nc)
{
case '%': growBuf.addChar('%'); break;
case 'y': growBuf.addInt(fmt_selected,getYear(dt)%100); formatUsed|=SF_Date; break;
case 'Y': growBuf.addInt("%d",getYear(dt)); formatUsed|=SF_Date; break;
case 'm': growBuf.addInt(fmt_selected,getMonth(dt)); formatUsed|=SF_Date; break;
case 'b': growBuf.addStr(theTranslator->trMonth(getMonth(dt),false,false)); formatUsed|=SF_Date; break;
case 'B': growBuf.addStr(theTranslator->trMonth(getMonth(dt),false,true)); formatUsed|=SF_Date; break;
case 'd': growBuf.addInt(fmt_selected,getDay(dt)); formatUsed|=SF_Date; break;
case 'u': growBuf.addInt("%d",getDayOfWeek(dt)); /* Monday = 1 ... Sunday = 7 */ formatUsed|=SF_Date; break;
case 'w': growBuf.addInt("%d",getDayOfWeek(dt)%7); /* Sunday = 0 ... Saturday = 6 */ formatUsed|=SF_Date; break;
case 'a': growBuf.addStr(theTranslator->trDayOfWeek(getDayOfWeek(dt),false,false)); formatUsed|=SF_Date; break;
case 'A': growBuf.addStr(theTranslator->trDayOfWeek(getDayOfWeek(dt),false,true)); formatUsed|=SF_Date; break;
case 'H': growBuf.addInt(fmt_selected,dt.tm_hour); formatUsed|=SF_Time; break;
case 'I': growBuf.addInt(fmt_selected,dt.tm_hour%12); formatUsed|=SF_Time; break;
case 'p': growBuf.addStr(theTranslator->trDayPeriod(dt.tm_hour>=12?1:0)); formatUsed|=SF_Time; break;
case 'M': growBuf.addInt(fmt_selected,dt.tm_min); formatUsed|=SF_Time; break;
case 'S': growBuf.addInt(fmt_selected,dt.tm_sec); formatUsed|=SF_Seconds; break;
default:
growBuf.addChar(c);
if (*(p-1)=='-') growBuf.addChar('-');
growBuf.addChar(nc);
break;
}
p++;
break;
default:
growBuf.addChar(c);
break;
}
}
growBuf.addChar(0);
return growBuf.get();
}
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