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Datetime.cpp
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////////////////////////////////////////////////////////////////////////////////
//
// Copyright 2006 - 2021, Paul Beckingham, Federico Hernandez.
//
// 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, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
//
// http://www.opensource.org/licenses/mit-license.php
//
////////////////////////////////////////////////////////////////////////////////
#include <cmake.h>
#include <Datetime.h>
#include <algorithm>
#include <iostream>
#include <sstream>
#include <iomanip>
#include <cassert>
#include <stdlib.h>
#include <shared.h>
#include <format.h>
#include <unicode.h>
#include <utf8.h>
static std::vector <std::string> dayNames {
"sunday",
"monday",
"tuesday",
"wednesday",
"thursday",
"friday",
"saturday"};
static std::vector <std::string> monthNames {
"january",
"february",
"march",
"april",
"may",
"june",
"july",
"august",
"september",
"october",
"november",
"december"};
int Datetime::weekstart = 1; // Monday, per ISO-8601.
int Datetime::minimumMatchLength = 3;
bool Datetime::isoEnabled = true;
bool Datetime::standaloneDateEnabled = true;
bool Datetime::standaloneTimeEnabled = true;
// When true,
// - HH:MM:SS is assumed to be today if the time > now, otherwise it is assumed to be tomorrow.
// - day name is converted to date relative to now
// - 1st, 2nd, 3rd, ... is converted to date relative to now
// When false,
// - HH:MM:SS is always today.
// - day name is always converted to date before now
// - 1st, 2nd, 3rd, ... is always converted to date before now
bool Datetime::timeRelative = true;
////////////////////////////////////////////////////////////////////////////////
Datetime::Datetime ()
{
clear ();
_date = time (nullptr);
}
////////////////////////////////////////////////////////////////////////////////
Datetime::Datetime (const std::string& input, const std::string& format)
{
clear ();
std::string::size_type start = 0;
if (! parse (input, start, format))
throw ::format ("'{1}' is not a valid date in the '{2}' format.", input, format);
}
////////////////////////////////////////////////////////////////////////////////
Datetime::Datetime (const time_t t)
{
clear ();
_date = t;
}
////////////////////////////////////////////////////////////////////////////////
Datetime::Datetime (const int y, const int m, const int d)
{
// Protect against arguments being passed in the wrong order.
assert (y >= 1969 && y <= 9999);
assert (m >= 1 && m <= 12);
assert (d >= 1 && d <= 31);
clear ();
// Error if not valid.
struct tm t {};
t.tm_isdst = -1; // Requests that mktime determine summer time effect.
t.tm_mday = d;
t.tm_mon = m - 1;
t.tm_year = y - 1900;
_date = mktime (&t);
}
////////////////////////////////////////////////////////////////////////////////
Datetime::Datetime (const int y, const int m, const int d,
const int hr, const int mi, const int se)
{
// Protect against arguments being passed in the wrong order.
assert (y >= 1969 && y <= 9999);
assert (m >= 1 && m <= 12);
assert (d >= 1 && d <= 31);
assert (hr >= 0 && hr <= 24);
assert (mi >= 0 && mi < 60);
assert (se >= 0 && se < 60);
clear ();
// Error if not valid.
struct tm t {};
t.tm_isdst = -1; // Requests that mktime determine summer time effect.
t.tm_mday = d;
t.tm_mon = m - 1;
t.tm_year = y - 1900;
t.tm_hour = hr;
t.tm_min = mi;
t.tm_sec = se;
_date = mktime (&t);
}
////////////////////////////////////////////////////////////////////////////////
bool Datetime::parse (
const std::string& input,
std::string::size_type& start,
const std::string& format)
{
auto i = start;
Pig pig (input);
if (i)
pig.skipN (static_cast <int> (i));
auto checkpoint = pig.cursor ();
// Parse epoch first, as it's the most common scenario.
if (parse_epoch (pig))
{
// ::validate and ::resolve are not needed in this case.
start = pig.cursor ();
return true;
}
if (parse_formatted (pig, format))
{
// Check the values and determine time_t.
if (validate ())
{
start = pig.cursor ();
resolve ();
return true;
}
}
// Allow parse_date_time and parse_date_time_ext regardless of
// Datetime::isoEnabled setting, because these formats are relied upon by
// the 'import' command, JSON parser and hook system.
if (parse_date_time_ext (pig) || // Strictest first.
parse_date_time (pig) ||
(Datetime::isoEnabled &&
( parse_date_ext (pig) ||
(Datetime::standaloneDateEnabled && parse_date (pig)) ||
parse_time_utc_ext (pig) ||
parse_time_utc (pig) ||
parse_time_off_ext (pig) ||
parse_time_off (pig) ||
parse_time_ext (pig) ||
(Datetime::standaloneTimeEnabled && parse_time (pig)) // Time last, as it is the most permissive.
)
)
)
{
// Check the values and determine time_t.
if (validate ())
{
start = pig.cursor ();
resolve ();
return true;
}
}
pig.restoreTo (checkpoint);
if (parse_named (pig))
{
// ::validate and ::resolve are not needed in this case.
start = pig.cursor ();
return true;
}
return false;
}
////////////////////////////////////////////////////////////////////////////////
void Datetime::clear ()
{
_year = 0;
_month = 0;
_week = 0;
_weekday = 0;
_julian = 0;
_day = 0;
_seconds = 0;
_offset = 0;
_utc = false;
_date = 0;
}
////////////////////////////////////////////////////////////////////////////////
bool Datetime::parse_formatted (Pig& pig, const std::string& format)
{
// Short-circuit on missing format.
if (format == "")
return false;
auto checkpoint = pig.cursor ();
int month {-1}; // So we can check later.
int day {-1};
int year {-1};
int hour {-1};
int minute {-1};
int second {-1};
// For parsing, unused.
int wday {-1};
int week {-1};
for (unsigned int f = 0; f < format.length (); ++f)
{
switch (format[f])
{
case 'm':
if (pig.getDigit (month))
{
if (month == 0)
pig.getDigit (month);
if (month == 1)
if (pig.getDigit (month))
month += 10;
}
else
{
pig.restoreTo (checkpoint);
return false;
}
break;
case 'M':
if (! pig.getDigit2 (month))
{
pig.restoreTo (checkpoint);
return false;
}
break;
case 'd':
if (pig.getDigit (day))
{
if (day == 0)
pig.getDigit (day);
if (day == 1 || day == 2 || day == 3)
{
int tens = day;
if (pig.getDigit (day))
day += 10 * tens;
}
}
else
{
pig.restoreTo (checkpoint);
return false;
}
break;
case 'D':
if (! pig.getDigit2 (day))
{
pig.restoreTo (checkpoint);
return false;
}
break;
case 'y':
if (! pig.getDigit2 (year))
{
pig.restoreTo (checkpoint);
return false;
}
year += 2000;
break;
case 'Y':
if (! pig.getDigit4 (year))
{
pig.restoreTo (checkpoint);
return false;
}
break;
case 'h':
if (pig.getDigit (hour))
{
if (hour == 0)
pig.getDigit (hour);
if (hour == 1 || hour == 2)
{
int tens = hour;
if (pig.getDigit (hour))
hour += 10 * tens;
}
}
else
{
pig.restoreTo (checkpoint);
return false;
}
break;
case 'H':
if (! pig.getDigit2 (hour))
{
pig.restoreTo (checkpoint);
return false;
}
break;
case 'n':
if (pig.getDigit (minute))
{
if (minute == 0)
pig.getDigit (minute);
if (minute < 6)
{
int tens = minute;
if (pig.getDigit (minute))
minute += 10 * tens;
}
}
else
{
pig.restoreTo (checkpoint);
return false;
}
break;
case 'N':
if (! pig.getDigit2 (minute))
{
pig.restoreTo (checkpoint);
return false;
}
break;
case 's':
if (pig.getDigit (second))
{
if (second == 0)
pig.getDigit (second);
if (second < 6)
{
int tens = second;
if (pig.getDigit (second))
second += 10 * tens;
}
}
else
{
pig.restoreTo (checkpoint);
return false;
}
break;
case 'S':
if (! pig.getDigit2 (second))
{
pig.restoreTo (checkpoint);
return false;
}
break;
case 'v':
if (pig.getDigit (week))
{
if (week == 0)
pig.getDigit (week);
if (week < 6)
{
int tens = week;
if (pig.getDigit (week))
week += 10 * tens;
}
}
else
{
pig.restoreTo (checkpoint);
return false;
}
break;
case 'V':
if (! pig.getDigit2 (week))
{
pig.restoreTo (checkpoint);
return false;
}
break;
case 'a':
wday = Datetime::dayOfWeek (pig.str ().substr (0, 3));
if (wday == -1)
{
pig.restoreTo (checkpoint);
return false;
}
pig.skipN (3);
break;
case 'A':
{
std::string dayName;
if (pig.getUntil (format[f + 1], dayName))
{
wday = Datetime::dayOfWeek (dayName);
if (wday == -1)
{
pig.restoreTo (checkpoint);
return false;
}
}
}
break;
case 'b':
month = Datetime::monthOfYear (pig.str ().substr (0, 3));
if (month == -1)
{
pig.restoreTo (checkpoint);
return false;
}
pig.skipN (3);
break;
case 'B':
{
std::string monthName;
if (pig.getUntil (format[f + 1], monthName))
{
month = Datetime::monthOfYear (monthName);
if (month == -1)
{
pig.restoreTo (checkpoint);
return false;
}
}
}
break;
default:
if (! pig.skip (format[f]))
{
pig.restoreTo (checkpoint);
return false;
}
break;
}
}
// It is possible that the format='Y-M-D', and the input is Y-M-DTH:N:SZ, and
// this should not be considered a match.
if (! pig.eos () && ! unicodeWhitespace (pig.peek ()))
{
pig.restoreTo (checkpoint);
return false;
}
// Missing values are filled in from the current date.
if (year == -1)
{
Datetime now;
year = now.year ();
if (month == -1)
{
month = now.month ();
if (day == -1)
{
day = now.day ();
if (hour == -1)
{
hour = now.hour ();
if (minute == -1)
{
minute = now.minute ();
if (second == -1)
second = now.second ();
}
}
}
}
}
// Any remaining undefined values are assigned defaults.
if (month == -1) month = 1;
if (day == -1) day = 1;
if (hour == -1) hour = 0;
if (minute == -1) minute = 0;
if (second == -1) second = 0;
_year = year;
_month = month;
_day = day;
_seconds = (hour * 3600) + (minute * 60) + second;
return true;
}
////////////////////////////////////////////////////////////////////////////////
// Note how these are all single words.
//
// Examples and descriptions, assuming now == 2017-03-05T12:34:56.
//
// Example Notes
// ------------------- ------------------
// now 2017-03-05T12:34:56 Unaffected
// yesterday 2017-03-04T00:00:00 Unaffected
// today 2017-03-05T00:00:00 Unaffected
// tomorrow 2017-03-06T00:00:00 Unaffected
// <ordinal> 12th 2017-03-12T00:00:00
// <day> monday 2017-03-06T00:00:00
// <month> april 2017-04-01T00:00:00
// later 9999-12-30T00:00:00 Unaffected
// someday 9999-12-30T00:00:00 Unaffected
// sopd 2017-03-04T00:00:00 Unaffected
// sod 2017-03-05T00:00:00 Unaffected
// sond 2017-03-06T00:00:00 Unaffected
// eopd 2017-03-05T00:00:00 Unaffected
// eod 2017-03-06T00:00:00 Unaffected
// eond 2017-03-07T00:00:00 Unaffected
// sopw 2017-02-26T00:00:00 Unaffected
// sow 2017-03-05T00:00:00 Unaffected
// sonw 2017-03-12T00:00:00 Unaffected
// eopw 2017-03-05T00:00:00 Unaffected
// eow 2017-03-12T00:00:00 Unaffected
// eonw 2017-03-19T00:00:00 Unaffected
// sopww 2017-02-27T00:00:00 Unaffected
// soww 2017-03-06T00:00:00
// sonww 2017-03-06T00:00:00 Unaffected
// eopww 2017-03-03T00:00:00 Unaffected
// eoww 2017-03-10T00:00:00
// eonww 2017-03-17T00:00:00 Unaffected
// sopm 2017-02-01T00:00:00 Unaffected
// som 2017-03-01T00:00:00 Unaffected
// sonm 2017-04-01T00:00:00 Unaffected
// eopm 2017-03-01T00:00:00 Unaffected
// eom 2017-04-01T00:00:00 Unaffected
// eonm 2017-05-01T00:00:00 Unaffected
// sopq 2017-10-01T00:00:00 Unaffected
// soq 2017-01-01T00:00:00 Unaffected
// sonq 2017-04-01T00:00:00 Unaffected
// eopq 2017-01-01T00:00:00 Unaffected
// eoq 2017-04-01T00:00:00 Unaffected
// eonq 2017-07-01T00:00:00 Unaffected
// sopy 2016-01-01T00:00:00 Unaffected
// soy 2017-01-01T00:00:00 Unaffected
// sony 2018-01-01T00:00:00 Unaffected
// eopy 2017-01-01T00:00:00 Unaffected
// eoy 2018-01-01T00:00:00 Unaffected
// eony 2020-01-01T00:00:00 Unaffected
// easter 2017-04-16T00:00:00
// eastermonday 2017-04-16T00:00:00
// ascension 2017-05-25T00:00:00
// pentecost 2017-06-04T00:00:00
// goodfriday 2017-04-14T00:00:00
// midsommar 2017-06-24T00:00:00 midnight, 1st Saturday after 20th June
// midsommarafton 2017-06-23T00:00:00 midnight, 1st Friday after 19th June
// juhannus 2017-06-23T00:00:00 midnight, 1st Friday after 19th June
//
bool Datetime::parse_named (Pig& pig)
{
auto checkpoint = pig.cursor ();
// Experimental handling of date phrases, such as "first monday in march".
// Note that this requires that phrases are deliminted by EOS or WS.
std::string token;
std::vector <std::string> tokens;
while (pig.getUntilWS (token))
{
tokens.push_back (token);
if (! pig.skipWS ())
break;
}
/*
// This group contains "1st monday ..." which must be processed before
// initializeOrdinal below.
if (initializeNthDayInMonth (tokens))
{
return true;
}
*/
// Restoration necessary because of the tokenization.
pig.restoreTo (checkpoint);
if (initializeNow (pig) ||
initializeYesterday (pig) ||
initializeToday (pig) ||
initializeTomorrow (pig) ||
initializeOrdinal (pig) ||
initializeDayName (pig) ||
initializeMonthName (pig) ||
initializeLater (pig) ||
initializeSopd (pig) ||
initializeSod (pig) ||
initializeSond (pig) ||
initializeEopd (pig) ||
initializeEod (pig) ||
initializeEond (pig) ||
initializeSopw (pig) ||
initializeSow (pig) ||
initializeSonw (pig) ||
initializeEopw (pig) ||
initializeEow (pig) ||
initializeEonw (pig) ||
initializeSopww (pig) || // Must appear after sopw
initializeSonww (pig) || // Must appear after sonw
initializeSoww (pig) || // Must appear after sow
initializeEopww (pig) || // Must appear after eopw
initializeEonww (pig) || // Must appear after eonw
initializeEoww (pig) || // Must appear after eow
initializeSopm (pig) ||
initializeSom (pig) ||
initializeSonm (pig) ||
initializeEopm (pig) ||
initializeEom (pig) ||
initializeEonm (pig) ||
initializeSopq (pig) ||
initializeSoq (pig) ||
initializeSonq (pig) ||
initializeEopq (pig) ||
initializeEoq (pig) ||
initializeEonq (pig) ||
initializeSopy (pig) ||
initializeSoy (pig) ||
initializeSony (pig) ||
initializeEopy (pig) ||
initializeEoy (pig) ||
initializeEony (pig) ||
initializeEaster (pig) ||
initializeMidsommar (pig) ||
initializeMidsommarafton (pig) ||
initializeInformalTime (pig))
{
return true;
}
pig.restoreTo (checkpoint);
return false;
}
////////////////////////////////////////////////////////////////////////////////
// Valid epoch values are unsigned integers after 1980-01-01T00:00:00Z. This
// restriction means that '12' will not be identified as an epoch date.
bool Datetime::parse_epoch (Pig& pig)
{
auto checkpoint = pig.cursor ();
long long epoch {};
if (pig.getDigits (epoch) &&
! unicodeLatinAlpha (pig.peek ()) &&
epoch >= 315532800 &&
epoch < 253402293599 ) // 9999-12-31, 23:59:59 AoE
{
_date = static_cast <time_t> (epoch);
return true;
}
pig.restoreTo (checkpoint);
return false;
}
////////////////////////////////////////////////////////////////////////////////
// date_ext 'T' time_utc_ext 'Z'
// date_ext 'T' time_off_ext
// date_ext 'T' time_ext
bool Datetime::parse_date_time_ext (Pig& pig)
{
auto checkpoint = pig.cursor ();
if (parse_date_ext (pig) &&
pig.skip ('T') &&
(parse_time_utc_ext (pig) ||
parse_time_off_ext (pig) ||
parse_time_ext (pig)))
{
return true;
}
pig.restoreTo (checkpoint);
return false;
}
////////////////////////////////////////////////////////////////////////////////
// YYYY-MM-DD
// YYYY-MM
// YYYY-DDD
// YYYY-Www-D
// YYYY-Www
bool Datetime::parse_date_ext (Pig& pig)
{
auto checkpoint = pig.cursor ();
int year {};
if (parse_year (pig, year) &&
pig.skip ('-'))
{
auto checkpointYear = pig.cursor ();
int month {};
int day {};
int julian {};
if (pig.skip ('W') &&
parse_week (pig, _week))
{
if (pig.skip ('-') &&
pig.getDigit (_weekday))
{
// What is happening here - must be something to do?
}
if (! unicodeLatinDigit (pig.peek ()))
{
_year = year;
return true;
}
}
pig.restoreTo (checkpointYear);
if (parse_month (pig, month) &&
pig.skip ('-') &&
parse_day (pig, day) &&
! unicodeLatinDigit (pig.peek ()))
{
_year = year;
_month = month;
_day = day;
return true;
}
pig.restoreTo (checkpointYear);
if (parse_julian (pig, julian) &&
! unicodeLatinDigit (pig.peek ()))
{
_year = year;
_julian = julian;
return true;
}
pig.restoreTo (checkpointYear);
if (parse_month (pig, month) &&
pig.peek () != '-' &&
! unicodeLatinDigit (pig.peek ()))
{
_year = year;
_month = month;
_day = 1;
return true;
}
}
pig.restoreTo (checkpoint);
return false;
}
////////////////////////////////////////////////////////////////////////////////
// ±hh[:mm]
bool Datetime::parse_off_ext (Pig& pig)
{
auto checkpoint = pig.cursor ();
int sign = pig.peek ();
if (sign == '+' || sign == '-')
{
pig.skipN (1);
int hour {0};
int minute {0};
if (parse_off_hour (pig, hour))
{
if (pig.skip (':'))
{
if (! parse_off_minute (pig, minute))
{
pig.restoreTo (checkpoint);
return false;
}
}
_offset = (hour * 3600) + (minute * 60);
if (sign == '-')
_offset = - _offset;
if (! unicodeLatinDigit (pig.peek ()))
return true;
}
}
pig.restoreTo (checkpoint);
return false;
}
////////////////////////////////////////////////////////////////////////////////
// hh:mm[:ss]
bool Datetime::parse_time_ext (Pig& pig, bool terminated)
{
auto checkpoint = pig.cursor ();
int hour {};
int minute {};
if (parse_hour (pig, hour) &&
pig.skip (':') &&
parse_minute (pig, minute))
{
if (pig.skip (':'))
{
int second {};
if (parse_second (pig, second) &&
! unicodeLatinDigit (pig.peek ()) &&
(! terminated || (pig.peek () != '-' && pig.peek () != '+')))
{
_seconds = (hour * 3600) + (minute * 60) + second;
return true;
}
pig.restoreTo (checkpoint);
return false;
}
auto following = pig.peek ();
if (! unicodeLatinDigit (following) &&
(! terminated || (following != '+' && following != '-')) &&
following != 'A' &&
following != 'a' &&
following != 'P' &&
following != 'p')
{
_seconds = (hour * 3600) + (minute * 60);
return true;
}
}
pig.restoreTo (checkpoint);
return false;
}
////////////////////////////////////////////////////////////////////////////////
// time-ext 'Z'
bool Datetime::parse_time_utc_ext (Pig& pig)
{
auto checkpoint = pig.cursor ();
if (parse_time_ext (pig, false) &&
pig.skip ('Z'))
{
if (! unicodeLatinDigit (pig.peek ()))
{
_utc = true;
return true;
}
}
pig.restoreTo (checkpoint);
return false;
}
////////////////////////////////////////////////////////////////////////////////
// time-ext off-ext
bool Datetime::parse_time_off_ext (Pig& pig)
{
auto checkpoint = pig.cursor ();
if (parse_time_ext (pig, false) &&
parse_off_ext (pig))
{
return true;
}
pig.restoreTo (checkpoint);
return false;
}
////////////////////////////////////////////////////////////////////////////////
// YYYYMMDDTHHMMSSZ
// YYYYMMDDTHHMMSS
bool Datetime::parse_date_time (Pig& pig)
{
auto checkpoint = pig.cursor ();
if (parse_date (pig) &&
pig.skip ('T') &&
(parse_time_utc (pig) ||
parse_time_off (pig) ||
parse_time (pig)))
{
return true;
}
pig.restoreTo (checkpoint);
return false;
}
////////////////////////////////////////////////////////////////////////////////
// YYYYWww
// YYYYDDD
// YYYYMMDD
// YYYYMM
bool Datetime::parse_date (Pig& pig)
{
auto checkpoint = pig.cursor ();
int year {};
int month {};
int julian {};
int week {};
int weekday {};
int day {};
if (parse_year (pig, year))
{
auto checkpointYear = pig.cursor ();
if (pig.skip ('W') &&
parse_week (pig, week))
{
if (pig.getDigit (weekday))
_weekday = weekday;
if (! unicodeLatinDigit (pig.peek ()))
{
_year = year;
_week = week;
return true;
}
}
pig.restoreTo (checkpointYear);
if (parse_julian (pig, julian) &&
! unicodeLatinDigit (pig.peek ()))
{
_year = year;
_julian = julian;
return true;
}
pig.restoreTo (checkpointYear);
if (parse_month (pig, month))
{
if (parse_day (pig, day))
{
if (! unicodeLatinDigit (pig.peek ()))