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tz.cpp
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// The MIT License (MIT)
//
// Copyright (c) 2015, 2016, 2017 Howard Hinnant
// Copyright (c) 2015 Ville Voutilainen
// Copyright (c) 2016 Alexander Kormanovsky
// Copyright (c) 2016, 2017 Jiangang Zhuang
// Copyright (c) 2017 Nicolas Veloz Savino
// Copyright (c) 2017 Florian Dang
// Copyright (c) 2017 Aaron Bishop
//
// 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.
//
// Our apologies. When the previous paragraph was written, lowercase had not yet
// been invented (that would involve another several millennia of evolution).
// We did not mean to shout.
#ifdef _WIN32
// windows.h will be included directly and indirectly (e.g. by curl).
// We need to define these macros to prevent windows.h bringing in
// more than we need and do it early so windows.h doesn't get included
// without these macros having been defined.
// min/max macros interfere with the C++ versions.
# ifndef NOMINMAX
# define NOMINMAX
# endif
// We don't need all that Windows has to offer.
# ifndef WIN32_LEAN_AND_MEAN
# define WIN32_LEAN_AND_MEAN
# endif
// for wcstombs
# ifndef _CRT_SECURE_NO_WARNINGS
# define _CRT_SECURE_NO_WARNINGS
# endif
// None of this happens with the MS SDK (at least VS14 which I tested), but:
// Compiling with mingw, we get "error: 'KF_FLAG_DEFAULT' was not declared in this scope."
// and error: 'SHGetKnownFolderPath' was not declared in this scope.".
// It seems when using mingw NTDDI_VERSION is undefined and that
// causes KNOWN_FOLDER_FLAG and the KF_ flags to not get defined.
// So we must define NTDDI_VERSION to get those flags on mingw.
// The docs say though here:
// https://msdn.microsoft.com/en-nz/library/windows/desktop/aa383745(v=vs.85).aspx
// that "If you define NTDDI_VERSION, you must also define _WIN32_WINNT."
// So we declare we require Vista or greater.
# ifdef __MINGW32__
# ifndef NTDDI_VERSION
# define NTDDI_VERSION 0x06000000
# define _WIN32_WINNT _WIN32_WINNT_VISTA
# elif NTDDI_VERSION < 0x06000000
# warning "If this fails to compile NTDDI_VERSION may be to low. See comments above."
# endif
// But once we define the values above we then get this linker error:
// "tz.cpp:(.rdata$.refptr.FOLDERID_Downloads[.refptr.FOLDERID_Downloads]+0x0): "
// "undefined reference to `FOLDERID_Downloads'"
// which #include <initguid.h> cures see:
// https://support.microsoft.com/en-us/kb/130869
# include <initguid.h>
// But with <initguid.h> included, the error moves on to:
// error: 'FOLDERID_Downloads' was not declared in this scope
// Which #include <knownfolders.h> cures.
# include <knownfolders.h>
# endif // __MINGW32__
# include <windows.h>
#endif // _WIN32
#include "date/tz_private.h"
#ifdef __APPLE__
# include "date/ios.h"
#else
# define TARGET_OS_IPHONE 0
#endif
#if USE_OS_TZDB
# include <dirent.h>
#endif
#include <algorithm>
#include <cctype>
#include <cstdlib>
#include <cstring>
#include <cwchar>
#include <exception>
#include <fstream>
#include <iostream>
#include <iterator>
#include <memory>
#if USE_OS_TZDB
# include <queue>
#endif
#include <sstream>
#include <string>
#include <tuple>
#include <vector>
#include <sys/stat.h>
// unistd.h is used on some platforms as part of the the means to get
// the current time zone. On Win32 windows.h provides a means to do it.
// gcc/mingw supports unistd.h on Win32 but MSVC does not.
#ifdef _WIN32
# ifdef WINAPI_FAMILY
# include <winapifamily.h>
# if WINAPI_FAMILY != WINAPI_FAMILY_DESKTOP_APP
# define WINRT
# define INSTALL .
# endif
# endif
# include <io.h> // _unlink etc.
# if defined(__clang__)
struct IUnknown; // fix for issue with static_cast<> in objbase.h
// (see https://github.com/philsquared/Catch/issues/690)
# endif
# include <shlobj.h> // CoTaskFree, ShGetKnownFolderPath etc.
# if HAS_REMOTE_API
# include <direct.h> // _mkdir
# include <shellapi.h> // ShFileOperation etc.
# endif // HAS_REMOTE_API
#else // !_WIN32
# include <unistd.h>
# if !USE_OS_TZDB
# include <wordexp.h>
# endif
# include <limits.h>
# include <string.h>
# if !USE_SHELL_API
# include <sys/stat.h>
# include <sys/fcntl.h>
# include <dirent.h>
# include <cstring>
# include <sys/wait.h>
# include <sys/types.h>
# endif //!USE_SHELL_API
#endif // !_WIN32
#if HAS_REMOTE_API
// Note curl includes windows.h so we must include curl AFTER definitions of things
// that affect windows.h such as NOMINMAX.
#if defined(_MSC_VER) && defined(SHORTENED_CURL_INCLUDE)
// For rmt_curl nuget package
# include <curl.h>
#else
# include <curl/curl.h>
#endif
#endif
#ifdef _WIN32
static CONSTDATA char folder_delimiter = '\\';
#else // !_WIN32
static CONSTDATA char folder_delimiter = '/';
#endif // !_WIN32
#if defined(__GNUC__) && __GNUC__ < 5
// GCC 4.9 Bug 61489 Wrong warning with -Wmissing-field-initializers
# pragma GCC diagnostic push
# pragma GCC diagnostic ignored "-Wmissing-field-initializers"
#endif // defined(__GNUC__) && __GNUC__ < 5
#if !USE_OS_TZDB
# ifdef _WIN32
# ifndef WINRT
namespace
{
struct task_mem_deleter
{
void operator()(wchar_t buf[])
{
if (buf != nullptr)
CoTaskMemFree(buf);
}
};
using co_task_mem_ptr = std::unique_ptr<wchar_t[], task_mem_deleter>;
}
// We might need to know certain locations even if not using the remote API,
// so keep these routines out of that block for now.
static
std::string
get_known_folder(const GUID& folderid)
{
std::string folder;
PWSTR pfolder = nullptr;
HRESULT hr = SHGetKnownFolderPath(folderid, KF_FLAG_DEFAULT, nullptr, &pfolder);
if (SUCCEEDED(hr))
{
co_task_mem_ptr folder_ptr(pfolder);
const wchar_t* fptr = folder_ptr.get();
auto state = std::mbstate_t();
const auto required = std::wcsrtombs(nullptr, &fptr, 0, &state);
if (required != 0 && required != std::size_t(-1))
{
folder.resize(required);
std::wcsrtombs(&folder[0], &fptr, folder.size(), &state);
}
}
return folder;
}
# ifndef INSTALL
// Usually something like "c:\Users\username\Downloads".
static
std::string
get_download_folder()
{
return get_known_folder(FOLDERID_Downloads);
}
# endif // !INSTALL
# endif // WINRT
# else // !_WIN32
# if !defined(INSTALL)
static
std::string
expand_path(std::string path)
{
# if TARGET_OS_IPHONE
return date::iOSUtils::get_tzdata_path();
# else // !TARGET_OS_IPHONE
::wordexp_t w{};
std::unique_ptr<::wordexp_t, void(*)(::wordexp_t*)> hold{&w, ::wordfree};
::wordexp(path.c_str(), &w, 0);
if (w.we_wordc != 1)
throw std::runtime_error("Cannot expand path: " + path);
path = w.we_wordv[0];
return path;
# endif // !TARGET_OS_IPHONE
}
static
std::string
get_download_folder()
{
return expand_path("~/Downloads");
}
# endif // !defined(INSTALL)
# endif // !_WIN32
#endif // !USE_OS_TZDB
namespace date
{
// +---------------------+
// | Begin Configuration |
// +---------------------+
using namespace detail;
#if !USE_OS_TZDB
static
std::string&
access_install()
{
static std::string install
#ifndef INSTALL
= get_download_folder() + folder_delimiter + "tzdata";
#else // !INSTALL
# define STRINGIZEIMP(x) #x
# define STRINGIZE(x) STRINGIZEIMP(x)
= STRINGIZE(INSTALL) + std::string(1, folder_delimiter) + "tzdata";
#undef STRINGIZEIMP
#undef STRINGIZE
#endif // !INSTALL
return install;
}
void
set_install(const std::string& s)
{
access_install() = s;
}
static
const std::string&
get_install()
{
static const std::string& ref = access_install();
return ref;
}
#if HAS_REMOTE_API
static
std::string
get_download_gz_file(const std::string& version)
{
auto file = get_install() + version + ".tar.gz";
return file;
}
#endif // HAS_REMOTE_API
#endif // !USE_OS_TZDB
// These can be used to reduce the range of the database to save memory
CONSTDATA auto min_year = date::year::min();
CONSTDATA auto max_year = date::year::max();
CONSTDATA auto min_day = date::January/1;
CONSTDATA auto max_day = date::December/31;
#if USE_OS_TZDB
CONSTCD14 const sys_seconds min_seconds = sys_days(min_year/min_day);
#endif // USE_OS_TZDB
#ifndef _WIN32
static
std::string
discover_tz_dir()
{
struct stat sb;
using namespace std;
# ifndef __APPLE__
CONSTDATA auto tz_dir_default = "/usr/share/zoneinfo";
CONSTDATA auto tz_dir_buildroot = "/usr/share/zoneinfo/uclibc";
// Check special path which is valid for buildroot with uclibc builds
if(stat(tz_dir_buildroot, &sb) == 0 && S_ISDIR(sb.st_mode))
return tz_dir_buildroot;
else if(stat(tz_dir_default, &sb) == 0 && S_ISDIR(sb.st_mode))
return tz_dir_default;
else
throw runtime_error("discover_tz_dir failed to find zoneinfo\n");
# else // __APPLE__
# if TARGET_OS_IPHONE
return "/var/db/timezone/zoneinfo";
# else
CONSTDATA auto timezone = "/etc/localtime";
if (!(lstat(timezone, &sb) == 0 && S_ISLNK(sb.st_mode) && sb.st_size > 0))
throw runtime_error("discover_tz_dir failed\n");
string result;
char rp[PATH_MAX+1] = {};
if (readlink(timezone, rp, sizeof(rp)-1) > 0)
result = string(rp);
else
throw system_error(errno, system_category(), "readlink() failed");
auto i = result.find("zoneinfo");
if (i == string::npos)
throw runtime_error("discover_tz_dir failed to find zoneinfo\n");
i = result.find('/', i);
if (i == string::npos)
throw runtime_error("discover_tz_dir failed to find '/'\n");
return result.substr(0, i);
# endif
# endif // __APPLE__
}
static
const std::string&
get_tz_dir()
{
static const std::string tz_dir = discover_tz_dir();
return tz_dir;
}
#endif
// +-------------------+
// | End Configuration |
// +-------------------+
#ifndef _MSC_VER
static_assert(min_year <= max_year, "Configuration error");
#endif
static std::unique_ptr<tzdb> init_tzdb();
tzdb_list::~tzdb_list()
{
const tzdb* ptr = head_;
head_ = nullptr;
while (ptr != nullptr)
{
auto next = ptr->next;
delete ptr;
ptr = next;
}
}
tzdb_list::tzdb_list(tzdb_list&& x) noexcept
: head_{x.head_.exchange(nullptr)}
{
}
void
tzdb_list::push_front(tzdb* tzdb) noexcept
{
tzdb->next = head_;
head_ = tzdb;
}
tzdb_list::const_iterator
tzdb_list::erase_after(const_iterator p) noexcept
{
auto t = p.p_->next;
p.p_->next = p.p_->next->next;
delete t;
return ++p;
}
struct tzdb_list::undocumented_helper
{
static void push_front(tzdb_list& db_list, tzdb* tzdb) noexcept
{
db_list.push_front(tzdb);
}
};
static
tzdb_list
create_tzdb()
{
tzdb_list tz_db;
tzdb_list::undocumented_helper::push_front(tz_db, init_tzdb().release());
return tz_db;
}
tzdb_list&
get_tzdb_list()
{
static tzdb_list tz_db = create_tzdb();
return tz_db;
}
#if !USE_OS_TZDB
#ifdef _WIN32
static
void
sort_zone_mappings(std::vector<date::detail::timezone_mapping>& mappings)
{
std::sort(mappings.begin(), mappings.end(),
[](const date::detail::timezone_mapping& lhs,
const date::detail::timezone_mapping& rhs)->bool
{
auto other_result = lhs.other.compare(rhs.other);
if (other_result < 0)
return true;
else if (other_result == 0)
{
auto territory_result = lhs.territory.compare(rhs.territory);
if (territory_result < 0)
return true;
else if (territory_result == 0)
{
if (lhs.type < rhs.type)
return true;
}
}
return false;
});
}
static
bool
native_to_standard_timezone_name(const std::string& native_tz_name,
std::string& standard_tz_name)
{
// TOOD! Need be a case insensitive compare?
if (native_tz_name == "UTC")
{
standard_tz_name = "Etc/UTC";
return true;
}
standard_tz_name.clear();
// TODO! we can improve on linear search.
const auto& mappings = date::get_tzdb().mappings;
for (const auto& tzm : mappings)
{
if (tzm.other == native_tz_name)
{
standard_tz_name = tzm.type;
return true;
}
}
return false;
}
// Parse this XML file:
// https://raw.githubusercontent.com/unicode-org/cldr/master/common/supplemental/windowsZones.xml
// The parsing method is designed to be simple and quick. It is not overly
// forgiving of change but it should diagnose basic format issues.
// See timezone_mapping structure for more info.
static
std::vector<detail::timezone_mapping>
load_timezone_mappings_from_xml_file(const std::string& input_path)
{
std::size_t line_num = 0;
std::vector<detail::timezone_mapping> mappings;
std::string line;
std::ifstream is(input_path);
if (!is.is_open())
{
// We don't emit file exceptions because that's an implementation detail.
std::string msg = "Error opening time zone mapping file \"";
msg += input_path;
msg += "\".";
throw std::runtime_error(msg);
}
auto error = [&input_path, &line_num](const char* info)
{
std::string msg = "Error loading time zone mapping file \"";
msg += input_path;
msg += "\" at line ";
msg += std::to_string(line_num);
msg += ": ";
msg += info;
throw std::runtime_error(msg);
};
// [optional space]a="b"
auto read_attribute = [&line, &error]
(const char* name, std::string& value, std::size_t startPos)
->std::size_t
{
value.clear();
// Skip leading space before attribute name.
std::size_t spos = line.find_first_not_of(' ', startPos);
if (spos == std::string::npos)
spos = startPos;
// Assume everything up to next = is the attribute name
// and that an = will always delimit that.
std::size_t epos = line.find('=', spos);
if (epos == std::string::npos)
error("Expected \'=\' right after attribute name.");
std::size_t name_len = epos - spos;
// Expect the name we find matches the name we expect.
if (line.compare(spos, name_len, name) != 0)
{
std::string msg;
msg = "Expected attribute name \'";
msg += name;
msg += "\' around position ";
msg += std::to_string(spos);
msg += " but found something else.";
error(msg.c_str());
}
++epos; // Skip the '=' that is after the attribute name.
spos = epos;
if (spos < line.length() && line[spos] == '\"')
++spos; // Skip the quote that is before the attribute value.
else
{
std::string msg = "Expected '\"' to begin value of attribute \'";
msg += name;
msg += "\'.";
error(msg.c_str());
}
epos = line.find('\"', spos);
if (epos == std::string::npos)
{
std::string msg = "Expected '\"' to end value of attribute \'";
msg += name;
msg += "\'.";
error(msg.c_str());
}
// Extract everything in between the quotes. Note no escaping is done.
std::size_t value_len = epos - spos;
value.assign(line, spos, value_len);
++epos; // Skip the quote that is after the attribute value;
return epos;
};
// Quick but not overly forgiving XML mapping file processing.
bool mapTimezonesOpenTagFound = false;
bool mapTimezonesCloseTagFound = false;
std::size_t mapZonePos = std::string::npos;
std::size_t mapTimezonesPos = std::string::npos;
CONSTDATA char mapTimeZonesOpeningTag[] = { "<mapTimezones " };
CONSTDATA char mapZoneOpeningTag[] = { "<mapZone " };
CONSTDATA std::size_t mapZoneOpeningTagLen = sizeof(mapZoneOpeningTag) /
sizeof(mapZoneOpeningTag[0]) - 1;
while (!mapTimezonesOpenTagFound)
{
std::getline(is, line);
++line_num;
if (is.eof())
{
// If there is no mapTimezones tag is it an error?
// Perhaps if there are no mapZone mappings it might be ok for
// its parent mapTimezones element to be missing?
// We treat this as an error though on the assumption that if there
// really are no mappings we should still get a mapTimezones parent
// element but no mapZone elements inside. Assuming we must
// find something will hopefully at least catch more drastic formatting
// changes or errors than if we don't do this and assume nothing found.
error("Expected a mapTimezones opening tag.");
}
mapTimezonesPos = line.find(mapTimeZonesOpeningTag);
mapTimezonesOpenTagFound = (mapTimezonesPos != std::string::npos);
}
// NOTE: We could extract the version info that follows the opening
// mapTimezones tag and compare that to the version of other data we have.
// I would have expected them to be kept in synch but testing has shown
// it typically does not match anyway. So what's the point?
while (!mapTimezonesCloseTagFound)
{
std::ws(is);
std::getline(is, line);
++line_num;
if (is.eof())
error("Expected a mapTimezones closing tag.");
if (line.empty())
continue;
mapZonePos = line.find(mapZoneOpeningTag);
if (mapZonePos != std::string::npos)
{
mapZonePos += mapZoneOpeningTagLen;
detail::timezone_mapping zm{};
std::size_t pos = read_attribute("other", zm.other, mapZonePos);
pos = read_attribute("territory", zm.territory, pos);
read_attribute("type", zm.type, pos);
mappings.push_back(std::move(zm));
continue;
}
mapTimezonesPos = line.find("</mapTimezones>");
mapTimezonesCloseTagFound = (mapTimezonesPos != std::string::npos);
if (!mapTimezonesCloseTagFound)
{
std::size_t commentPos = line.find("<!--");
if (commentPos == std::string::npos)
error("Unexpected mapping record found. A xml mapZone or comment "
"attribute or mapTimezones closing tag was expected.");
}
}
is.close();
return mappings;
}
#endif // _WIN32
// Parsing helpers
static
std::string
parse3(std::istream& in)
{
std::string r(3, ' ');
ws(in);
r[0] = static_cast<char>(in.get());
r[1] = static_cast<char>(in.get());
r[2] = static_cast<char>(in.get());
return r;
}
static
unsigned
parse_dow(std::istream& in)
{
CONSTDATA char*const dow_names[] =
{"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};
auto s = parse3(in);
auto dow = std::find(std::begin(dow_names), std::end(dow_names), s) - dow_names;
if (dow >= std::end(dow_names) - std::begin(dow_names))
throw std::runtime_error("oops: bad dow name: " + s);
return static_cast<unsigned>(dow);
}
static
unsigned
parse_month(std::istream& in)
{
CONSTDATA char*const month_names[] =
{"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
auto s = parse3(in);
auto m = std::find(std::begin(month_names), std::end(month_names), s) - month_names;
if (m >= std::end(month_names) - std::begin(month_names))
throw std::runtime_error("oops: bad month name: " + s);
return static_cast<unsigned>(++m);
}
static
std::chrono::seconds
parse_unsigned_time(std::istream& in)
{
using namespace std::chrono;
int x;
in >> x;
auto r = seconds{hours{x}};
if (!in.eof() && in.peek() == ':')
{
in.get();
in >> x;
r += minutes{x};
if (!in.eof() && in.peek() == ':')
{
in.get();
in >> x;
r += seconds{x};
}
}
return r;
}
static
std::chrono::seconds
parse_signed_time(std::istream& in)
{
ws(in);
auto sign = 1;
if (in.peek() == '-')
{
sign = -1;
in.get();
}
else if (in.peek() == '+')
in.get();
return sign * parse_unsigned_time(in);
}
// MonthDayTime
detail::MonthDayTime::MonthDayTime(local_seconds tp, tz timezone)
: zone_(timezone)
{
using namespace date;
const auto dp = date::floor<days>(tp);
const auto hms = make_time(tp - dp);
const auto ymd = year_month_day(dp);
u = ymd.month() / ymd.day();
h_ = hms.hours();
m_ = hms.minutes();
s_ = hms.seconds();
}
detail::MonthDayTime::MonthDayTime(const date::month_day& md, tz timezone)
: zone_(timezone)
{
u = md;
}
date::day
detail::MonthDayTime::day() const
{
switch (type_)
{
case month_day:
return u.month_day_.day();
case month_last_dow:
return date::day{31};
case lteq:
case gteq:
break;
}
return u.month_day_weekday_.month_day_.day();
}
date::month
detail::MonthDayTime::month() const
{
switch (type_)
{
case month_day:
return u.month_day_.month();
case month_last_dow:
return u.month_weekday_last_.month();
case lteq:
case gteq:
break;
}
return u.month_day_weekday_.month_day_.month();
}
int
detail::MonthDayTime::compare(date::year y, const MonthDayTime& x, date::year yx,
std::chrono::seconds offset, std::chrono::minutes prev_save) const
{
if (zone_ != x.zone_)
{
auto dp0 = to_sys_days(y);
auto dp1 = x.to_sys_days(yx);
if (std::abs((dp0-dp1).count()) > 1)
return dp0 < dp1 ? -1 : 1;
if (zone_ == tz::local)
{
auto tp0 = to_time_point(y) - prev_save;
if (x.zone_ == tz::utc)
tp0 -= offset;
auto tp1 = x.to_time_point(yx);
return tp0 < tp1 ? -1 : tp0 == tp1 ? 0 : 1;
}
else if (zone_ == tz::standard)
{
auto tp0 = to_time_point(y);
auto tp1 = x.to_time_point(yx);
if (x.zone_ == tz::local)
tp1 -= prev_save;
else
tp0 -= offset;
return tp0 < tp1 ? -1 : tp0 == tp1 ? 0 : 1;
}
// zone_ == tz::utc
auto tp0 = to_time_point(y);
auto tp1 = x.to_time_point(yx);
if (x.zone_ == tz::local)
tp1 -= offset + prev_save;
else
tp1 -= offset;
return tp0 < tp1 ? -1 : tp0 == tp1 ? 0 : 1;
}
auto const t0 = to_time_point(y);
auto const t1 = x.to_time_point(yx);
return t0 < t1 ? -1 : t0 == t1 ? 0 : 1;
}
sys_seconds
detail::MonthDayTime::to_sys(date::year y, std::chrono::seconds offset,
std::chrono::seconds save) const
{
using namespace date;
using namespace std::chrono;
auto until_utc = to_time_point(y);
if (zone_ == tz::standard)
until_utc -= offset;
else if (zone_ == tz::local)
until_utc -= offset + save;
return until_utc;
}
detail::MonthDayTime::U&
detail::MonthDayTime::U::operator=(const date::month_day& x)
{
month_day_ = x;
return *this;
}
detail::MonthDayTime::U&
detail::MonthDayTime::U::operator=(const date::month_weekday_last& x)
{
month_weekday_last_ = x;
return *this;
}
detail::MonthDayTime::U&
detail::MonthDayTime::U::operator=(const pair& x)
{
month_day_weekday_ = x;
return *this;
}
date::sys_days
detail::MonthDayTime::to_sys_days(date::year y) const
{
using namespace std::chrono;
using namespace date;
switch (type_)
{
case month_day:
return sys_days(y/u.month_day_);
case month_last_dow:
return sys_days(y/u.month_weekday_last_);
case lteq:
{
auto const x = y/u.month_day_weekday_.month_day_;
auto const wd1 = weekday(static_cast<sys_days>(x));
auto const wd0 = u.month_day_weekday_.weekday_;
return sys_days(x) - (wd1-wd0);
}
case gteq:
break;
}
auto const x = y/u.month_day_weekday_.month_day_;
auto const wd1 = u.month_day_weekday_.weekday_;
auto const wd0 = weekday(static_cast<sys_days>(x));
return sys_days(x) + (wd1-wd0);
}
sys_seconds
detail::MonthDayTime::to_time_point(date::year y) const
{
// Add seconds first to promote to largest rep early to prevent overflow
return to_sys_days(y) + s_ + h_ + m_;
}
void
detail::MonthDayTime::canonicalize(date::year y)
{
using namespace std::chrono;
using namespace date;
switch (type_)
{
case month_day:
return;
case month_last_dow:
{
auto const ymd = year_month_day(sys_days(y/u.month_weekday_last_));
u.month_day_ = ymd.month()/ymd.day();
type_ = month_day;
return;
}
case lteq:
{
auto const x = y/u.month_day_weekday_.month_day_;
auto const wd1 = weekday(static_cast<sys_days>(x));
auto const wd0 = u.month_day_weekday_.weekday_;
auto const ymd = year_month_day(sys_days(x) - (wd1-wd0));
u.month_day_ = ymd.month()/ymd.day();
type_ = month_day;
return;
}
case gteq:
{
auto const x = y/u.month_day_weekday_.month_day_;
auto const wd1 = u.month_day_weekday_.weekday_;
auto const wd0 = weekday(static_cast<sys_days>(x));
auto const ymd = year_month_day(sys_days(x) + (wd1-wd0));
u.month_day_ = ymd.month()/ymd.day();
type_ = month_day;
return;
}
}
}
std::istream&
detail::operator>>(std::istream& is, MonthDayTime& x)
{
using namespace date;
using namespace std::chrono;
assert(((std::ios::failbit | std::ios::badbit) & is.exceptions()) ==
(std::ios::failbit | std::ios::badbit));
x = MonthDayTime{};
if (!is.eof() && ws(is) && !is.eof() && is.peek() != '#')
{
auto m = parse_month(is);
if (!is.eof() && ws(is) && !is.eof() && is.peek() != '#')
{
if (is.peek() == 'l')
{
for (int i = 0; i < 4; ++i)
is.get();
auto dow = parse_dow(is);
x.type_ = MonthDayTime::month_last_dow;
x.u = date::month(m)/weekday(dow)[last];
}
else if (std::isalpha(is.peek()))
{
auto dow = parse_dow(is);
char c{};
is >> c;
if (c == '<' || c == '>')
{
char c2{};
is >> c2;
if (c2 != '=')
throw std::runtime_error(std::string("bad operator: ") + c + c2);
int d;
is >> d;
if (d < 1 || d > 31)
throw std::runtime_error(std::string("bad operator: ") + c + c2
+ std::to_string(d));
x.type_ = c == '<' ? MonthDayTime::lteq : MonthDayTime::gteq;
x.u = MonthDayTime::pair{ date::month(m) / d, date::weekday(dow) };
}
else
throw std::runtime_error(std::string("bad operator: ") + c);
}