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Add more options to the parse functionality.

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Howard Hinnant 2016-05-22 12:28:47 -04:00
parent 6dd3c0f15d
commit 963f4dd80e
1 changed files with 103 additions and 16 deletions
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117
tz.h
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@ -1219,8 +1219,8 @@ namespace detail
template <class Duration>
void
parse(std::istream& is, const std::string& format,
sys_time<Duration>& tp, std::string* abbrev = nullptr)
parse(std::istream& is, const std::string& format, sys_time<Duration>& tp,
std::string& abbrev, std::chrono::minutes& offset)
{
using namespace std;
using namespace std::chrono;
@ -1230,9 +1230,9 @@ parse(std::istream& is, const std::string& format,
auto& f = use_facet<time_get<char>>(is.getloc());
ios_base::iostate err = ios_base::goodbit;
std::tm tm{};
minutes offset{};
Duration subseconds{};
std::string temp_abbrev;
minutes temp_offset{};
auto b = format.data();
auto i = b;
@ -1286,10 +1286,10 @@ parse(std::istream& is, const std::string& format,
if (!is.fail() && std::isdigit(h1) && std::isdigit(h0)
&& std::isdigit(m1) && std::isdigit(m0))
{
offset = 10*hours{h1 - '0'} + hours{h0 - '0'} +
temp_offset = 10*hours{h1 - '0'} + hours{h0 - '0'} +
10*minutes{m1 - '0'} + minutes{m0 - '0'};
if (sign == '-')
offset = -offset;
temp_offset = -temp_offset;
}
else
err |= ios_base::failbit;
@ -1324,10 +1324,8 @@ parse(std::istream& is, const std::string& format,
auto tt = _mkgmtime(&tm);
#endif
tp = floor<Duration>(system_clock::from_time_t(tt) + subseconds);
if (abbrev != nullptr)
*abbrev = std::move(temp_abbrev);
else
tp -= offset;
abbrev = std::move(temp_abbrev);
offset = temp_offset;
}
}
is.setstate(err);
@ -1341,19 +1339,57 @@ inline
void
parse(std::istream& is, const std::string& format, sys_time<Duration>& tp)
{
detail::parse(is, format, tp);
std::string abbrev;
std::chrono::minutes offset{};
detail::parse(is, format, tp, abbrev, offset);
if (!is.fail())
tp = floor<Duration>(tp - offset);
}
template <class Duration>
inline
void
parse(std::istream& is, const std::string& format, local_time<Duration>& tp,
parse(std::istream& is, const std::string& format, sys_time<Duration>& tp,
std::string& abbrev)
{
sys_time<Duration> st;
detail::parse(is, format, st, &abbrev);
std::chrono::minutes offset{};
detail::parse(is, format, tp, abbrev, offset);
if (!is.fail())
tp = local_time<Duration>{st.time_since_epoch()};
tp = floor<Duration>(tp - offset);
}
template <class Duration>
inline
void
parse(std::istream& is, const std::string& format, sys_time<Duration>& tp,
std::chrono::minutes& offset)
{
std::string abbrev;
detail::parse(is, format, tp, abbrev, offset);
if (!is.fail())
tp = floor<Duration>(tp - offset);
}
template <class Duration>
inline
void
parse(std::istream& is, const std::string& format, sys_time<Duration>& tp,
std::string& abbrev, std::chrono::minutes& offset)
{
detail::parse(is, format, tp, abbrev, offset);
if (!is.fail())
tp = floor<Duration>(tp - offset);
}
template <class Duration>
inline
void
parse(std::istream& is, const std::string& format, sys_time<Duration>& tp,
std::chrono::minutes& offset, std::string& abbrev)
{
detail::parse(is, format, tp, abbrev, offset);
if (!is.fail())
tp = floor<Duration>(tp - offset);
}
template <class Duration>
@ -1363,7 +1399,58 @@ parse(std::istream& is, const std::string& format, local_time<Duration>& tp)
{
sys_time<Duration> st;
std::string abbrev;
detail::parse(is, format, st, &abbrev);
std::chrono::minutes offset{};
detail::parse(is, format, st, abbrev, offset);
if (!is.fail())
tp = local_time<Duration>{st.time_since_epoch()};
}
template <class Duration>
inline
void
parse(std::istream& is, const std::string& format, local_time<Duration>& tp,
std::string& abbrev)
{
sys_time<Duration> st;
std::chrono::minutes offset{};
detail::parse(is, format, st, abbrev, offset);
if (!is.fail())
tp = local_time<Duration>{st.time_since_epoch()};
}
template <class Duration>
inline
void
parse(std::istream& is, const std::string& format, local_time<Duration>& tp,
std::chrono::minutes& offset)
{
sys_time<Duration> st;
std::string abbrev;
detail::parse(is, format, st, abbrev, offset);
if (!is.fail())
tp = local_time<Duration>{st.time_since_epoch()};
}
template <class Duration>
inline
void
parse(std::istream& is, const std::string& format, local_time<Duration>& tp,
std::string& abbrev, std::chrono::minutes& offset)
{
sys_time<Duration> st;
detail::parse(is, format, st, abbrev, offset);
if (!is.fail())
tp = local_time<Duration>{st.time_since_epoch()};
}
template <class Duration>
inline
void
parse(std::istream& is, const std::string& format, local_time<Duration>& tp,
std::chrono::minutes& offset, std::string& abbrev)
{
sys_time<Duration> st;
detail::parse(is, format, st, abbrev, offset);
if (!is.fail())
tp = local_time<Duration>{st.time_since_epoch()};
}