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Unified formatters for std::chrono::time_point<std::chrono::system_clock, Duration> and std::tm

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This commit is contained in:
Vladislav Shchapov 2021-10-10 21:43:55 +05:00 committed by Victor Zverovich
parent 4707373d33
commit f8542cd988
1 changed files with 18 additions and 17 deletions
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35
include/fmt/chrono.h
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@ -1694,17 +1694,13 @@ template <typename Char, typename Duration>
struct formatter<std::chrono::time_point<std::chrono::system_clock, Duration>,
Char> : formatter<std::tm, Char> {
FMT_CONSTEXPR formatter() {
this->specs = {default_specs, sizeof(default_specs) / sizeof(Char)};
this->do_parse(default_specs,
default_specs + (sizeof(default_specs) / sizeof(Char)));
}
template <typename ParseContext>
FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {
auto begin = ctx.begin();
auto end = ctx.end();
if (begin != end && *begin == ':') ++begin;
end = detail::parse_chrono_format(begin, end, detail::tm_format_checker());
if (end != begin) this->specs = {begin, detail::to_unsigned(end - begin)};
return end;
return this->do_parse(ctx.begin(), ctx.end(), true);
}
template <typename FormatContext>
@ -1714,7 +1710,8 @@ struct formatter<std::chrono::time_point<std::chrono::system_clock, Duration>,
return formatter<std::tm, Char>::format(time, ctx);
}
static constexpr Char default_specs[] = {'%', 'F', ' ', '%', 'T'};
// '}' - for detail::parse_chrono_format.
static constexpr Char default_specs[] = {'%', 'F', ' ', '%', 'T', '}'};
};
template <typename Char, typename Duration>
@ -1730,17 +1727,17 @@ template <typename Char> struct formatter<std::tm, Char> {
hh_mm_ss,
};
spec spec_ = spec::unknown;
public:
basic_string_view<Char> specs;
template <typename ParseContext>
FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {
auto begin = ctx.begin();
auto end = ctx.end();
protected:
template <typename It>
FMT_CONSTEXPR auto do_parse(It begin, It end, bool with_default = false)
-> It {
if (begin != end && *begin == ':') ++begin;
end = detail::parse_chrono_format(begin, end, detail::tm_format_checker());
specs = {begin, detail::to_unsigned(end - begin)};
if (!with_default || end != begin) {
specs = {begin, detail::to_unsigned(end - begin)};
}
// basic_string_view<>::compare isn't constexpr before C++17
if (specs.size() == 2 && specs[0] == Char('%')) {
if (specs[1] == Char('F'))
@ -1751,12 +1748,17 @@ template <typename Char> struct formatter<std::tm, Char> {
return end;
}
public:
template <typename ParseContext>
FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {
return this->do_parse(ctx.begin(), ctx.end());
}
template <typename FormatContext>
auto format(const std::tm& tm, FormatContext& ctx) const
-> decltype(ctx.out()) {
detail::tm_formatter<FormatContext, decltype(ctx.out())> f(ctx, ctx.out(),
tm);
if (spec_ == spec::year_month_day) {
f.on_iso_date();
return f.out;
@ -1764,7 +1766,6 @@ template <typename Char> struct formatter<std::tm, Char> {
f.on_iso_time();
return f.out;
}
detail::parse_chrono_format(specs.begin(), specs.end(), f);
return f.out;
}