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First stub at the datetime format parser

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Victor Zverovich 2018-11-25 16:10:05 -08:00
parent 645c76a9a5
commit a5a9805a91
1 changed files with 50 additions and 1 deletions
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51
include/fmt/time.h
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@ -1,6 +1,6 @@
// Formatting library for C++ - time formatting
//
// Copyright (c) 2012 - 2016, Victor Zverovich
// Copyright (c) 2012 - present, Victor Zverovich
// All rights reserved.
//
// For the license information refer to format.h.
@ -22,7 +22,56 @@ inline null<> localtime_r FMT_NOMACRO(...) { return null<>(); }
inline null<> localtime_s(...) { return null<>(); }
inline null<> gmtime_r(...) { return null<>(); }
inline null<> gmtime_s(...) { return null<>(); }
// Parses a put_time-like format string and invokes handler actions.
template <bool IS_CONSTEXPR, typename Char, typename Handler>
FMT_CONSTEXPR void parse_datetime_format(
basic_string_view<Char> format_str, Handler &&handler) {
auto begin = format_str.data();
auto end = begin + format_str.size();
auto ptr = begin;
while (ptr != end) {
auto c = *ptr;
if (c == '}') break;
if (c != '%') {
++ptr;
continue;
}
if (begin != ptr)
handler.on_text(begin, ptr);
c = *++ptr;
begin = ptr;
switch (c) {
case '%':
handler.on_text(ptr, ptr + 1);
break;
// Day of the week:
case 'a':
handler.on_abbr_weekday();
break;
case 'A':
handler.on_full_weekday();
break;
case 'w':
handler.on_dec0_weekday();
break;
case 'u':
handler.on_dec1_weekday();
break;
// Month:
case 'b': case 'h':
handler.on_abbr_month();
break;
case 'B':
handler.on_full_month();
break;
// TODO: parse more format specifiers
}
}
if (begin != ptr)
handler.on_text(begin, ptr);
}
} // namespace internal
// Thread-safe replacement for std::localtime
inline std::tm localtime(std::time_t time) {