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author | Andy Hung <hunga@google.com> | 2020-10-29 02:09:57 +0000 |
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committer | Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com> | 2020-10-29 02:09:57 +0000 |
commit | 6305a290a0e261dbf61354f298a799297de54360 (patch) | |
tree | 35d73359fd09cc16d1fbb857909581bad75b765e /third_party/abseil-cpp/absl/time/internal/cctz/src/time_zone_posix.h | |
parent | bdcf7c15937fa6f88b52f091024bd667d6b2b302 (diff) | |
parent | b02c729712188d3420b78a1bbb1b779544bd4427 (diff) | |
download | webrtc-6305a290a0e261dbf61354f298a799297de54360.tar.gz |
Merge "Import abseil-cpp to third_party" am: aa2897cdcb am: 2cc1e455f9 am: 4211622fc5 am: b02c729712
Original change: https://android-review.googlesource.com/c/platform/external/webrtc/+/1477956
Change-Id: I2157494054f0fdd15375163dda6ee668e2b90f0b
Diffstat (limited to 'third_party/abseil-cpp/absl/time/internal/cctz/src/time_zone_posix.h')
-rw-r--r-- | third_party/abseil-cpp/absl/time/internal/cctz/src/time_zone_posix.h | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/third_party/abseil-cpp/absl/time/internal/cctz/src/time_zone_posix.h b/third_party/abseil-cpp/absl/time/internal/cctz/src/time_zone_posix.h new file mode 100644 index 0000000000..0cf29055f5 --- /dev/null +++ b/third_party/abseil-cpp/absl/time/internal/cctz/src/time_zone_posix.h @@ -0,0 +1,132 @@ +// Copyright 2016 Google Inc. All Rights Reserved. +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// https://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +// Parsing of a POSIX zone spec as described in the TZ part of section 8.3 in +// http://pubs.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap08.html. +// +// The current POSIX spec for America/Los_Angeles is "PST8PDT,M3.2.0,M11.1.0", +// which would be broken down as ... +// +// PosixTimeZone { +// std_abbr = "PST" +// std_offset = -28800 +// dst_abbr = "PDT" +// dst_offset = -25200 +// dst_start = PosixTransition { +// date { +// m { +// month = 3 +// week = 2 +// weekday = 0 +// } +// } +// time { +// offset = 7200 +// } +// } +// dst_end = PosixTransition { +// date { +// m { +// month = 11 +// week = 1 +// weekday = 0 +// } +// } +// time { +// offset = 7200 +// } +// } +// } + +#ifndef ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_POSIX_H_ +#define ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_POSIX_H_ + +#include <cstdint> +#include <string> + +#include "absl/base/config.h" + +namespace absl { +ABSL_NAMESPACE_BEGIN +namespace time_internal { +namespace cctz { + +// The date/time of the transition. The date is specified as either: +// (J) the Nth day of the year (1 <= N <= 365), excluding leap days, or +// (N) the Nth day of the year (0 <= N <= 365), including leap days, or +// (M) the Nth weekday of a month (e.g., the 2nd Sunday in March). +// The time, specified as a day offset, identifies the particular moment +// of the transition, and may be negative or >= 24h, and in which case +// it would take us to another day, and perhaps week, or even month. +struct PosixTransition { + enum DateFormat { J, N, M }; + + struct Date { + struct NonLeapDay { + std::int_fast16_t day; // day of non-leap year [1:365] + }; + struct Day { + std::int_fast16_t day; // day of year [0:365] + }; + struct MonthWeekWeekday { + std::int_fast8_t month; // month of year [1:12] + std::int_fast8_t week; // week of month [1:5] (5==last) + std::int_fast8_t weekday; // 0==Sun, ..., 6=Sat + }; + + DateFormat fmt; + + union { + NonLeapDay j; + Day n; + MonthWeekWeekday m; + }; + }; + + struct Time { + std::int_fast32_t offset; // seconds before/after 00:00:00 + }; + + Date date; + Time time; +}; + +// The entirety of a POSIX-string specified time-zone rule. The standard +// abbreviation and offset are always given. If the time zone includes +// daylight saving, then the daylight abbrevation is non-empty and the +// remaining fields are also valid. Note that the start/end transitions +// are not ordered---in the southern hemisphere the transition to end +// daylight time occurs first in any particular year. +struct PosixTimeZone { + std::string std_abbr; + std::int_fast32_t std_offset; + + std::string dst_abbr; + std::int_fast32_t dst_offset; + PosixTransition dst_start; + PosixTransition dst_end; +}; + +// Breaks down a POSIX time-zone specification into its constituent pieces, +// filling in any missing values (DST offset, or start/end transition times) +// with the standard-defined defaults. Returns false if the specification +// could not be parsed (although some fields of *res may have been altered). +bool ParsePosixSpec(const std::string& spec, PosixTimeZone* res); + +} // namespace cctz +} // namespace time_internal +ABSL_NAMESPACE_END +} // namespace absl + +#endif // ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_POSIX_H_ |