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Add member function name() const to Posix::time_zone

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* Returns the minimal string that uniquely identifies this
  time_zone.  That is, it takes advantage of all defaults.
This commit is contained in:
Howard Hinnant 2020-05-06 22:12:15 -04:00
parent e12095f26f
commit f43c39fcf1
1 changed files with 106 additions and 0 deletions
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106
include/date/ptz.h
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@ -87,6 +87,7 @@ public:
bool ok() const {return mode_ != off;}
date::local_seconds operator()(date::year y) const;
std::string to_string() const;
friend std::ostream& operator<<(std::ostream& os, const rule& r);
friend unsigned read_date(const string_t& s, unsigned i, rule& r);
@ -119,6 +120,62 @@ rule::operator()(date::year y) const
return t;
}
inline
std::string
rule::to_string() const
{
using namespace std::chrono;
auto print_offset = [](seconds off)
{
std::string nm;
if (off != hours{2})
{
date::hh_mm_ss offset{off};
nm = '/';
nm += std::to_string(offset.hours().count());
if (offset.minutes() != minutes{0} || offset.seconds() != seconds{0})
{
nm += ':';
if (offset.minutes() < minutes{10})
nm += '0';
nm += std::to_string(offset.minutes().count());
if (offset.seconds() != seconds{0})
{
nm += ':';
if (offset.seconds() < seconds{10})
nm += '0';
nm += std::to_string(offset.seconds().count());
}
}
}
return nm;
};
std::string nm;
switch (mode_)
{
case rule::J:
nm = 'J';
nm += std::to_string(n_);
break;
case rule::M:
nm = 'M';
nm += std::to_string(static_cast<unsigned>(m_));
nm += '.';
nm += std::to_string(n_);
nm += '.';
nm += std::to_string(wd_.c_encoding());
break;
case rule::N:
nm = std::to_string(n_);
break;
default:
break;
}
nm += print_offset(time_);
return nm;
}
inline
std::ostream&
operator<<(std::ostream& os, const rule& r)
@ -178,6 +235,8 @@ public:
friend std::ostream& operator<<(std::ostream& os, const time_zone& z);
const time_zone* operator->() const {return this;}
std::string name() const;
};
inline
@ -419,6 +478,53 @@ operator<<(std::ostream& os, const time_zone& z)
return os;
}
inline
std::string
time_zone::name() const
{
using namespace date;
using namespace std::chrono;
auto nm = std_abbrev_;
auto print_offset = [](seconds off)
{
std::string nm;
hh_mm_ss<seconds> offset{-off};
if (offset.is_negative())
nm += '-';
nm += std::to_string(offset.hours().count());
if (offset.minutes() != minutes{0} || offset.seconds() != seconds{0})
{
nm += ':';
if (offset.minutes() < minutes{10})
nm += '0';
nm += std::to_string(offset.minutes().count());
if (offset.seconds() != seconds{0})
{
nm += ':';
if (offset.seconds() < seconds{10})
nm += '0';
nm += std::to_string(offset.seconds().count());
}
}
return nm;
};
nm += print_offset(offset_);
if (!dst_abbrev_.empty())
{
nm += dst_abbrev_;
if (save_ != hours{1})
nm += print_offset(offset_+save_);
if (start_rule_.ok())
{
nm += ',';
nm += start_rule_.to_string();
nm += ',';
nm += end_rule_.to_string();
}
}
return nm;
}
namespace detail
{