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authorGravatar Abseil Team <absl-team@google.com>2018-10-10 12:31:37 -0700
committerGravatar CJ Johnson <johnsoncj@google.com>2018-10-10 15:35:19 -0400
commitf340f773edab951656b19b6f1a77c964a78ec4c2 (patch)
treec42bf7faf49fb2355661c9f39c40513bc1ff2697 /absl/time/civil_time.cc
parent445998d7ac4e5d3c50411d377e3b50e960d2d6c2 (diff)
Export of internal Abseil changes.
-- 906c47420646d510edd2479d5542c56f5fa31b65 by CJ Johnson <johnsoncj@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 216573923 -- 74560d4afd2b605909e677c6fc3076049fb3010a by Eric Fiselier <ericwf@google.com>: Avoid -Wformat-pedantic in benchmark. PiperOrigin-RevId: 216523769 -- 9bcc9da8b03e6d1ea43ee78931256c5541cb9686 by Eric Fiselier <ericwf@google.com>: Delete unused CityHash functions. PiperOrigin-RevId: 216464492 -- a42563b394c89fbb4c55cb5a6a5edbf96d271eea by Abseil Team <absl-team@google.com>: Introduce new Abseil interfaces for converting between civil times and absolute times.s Deprecates absl::ConvertDateTime() and absl::FromDateTime(). PiperOrigin-RevId: 216424948 -- 088e11235124267517d7f137854fa5554679c24f by Eric Fiselier <ericwf@google.com>: Remove unneeded break statements in test. PiperOrigin-RevId: 216403321 GitOrigin-RevId: 906c47420646d510edd2479d5542c56f5fa31b65 Change-Id: Idb44420be623e369c66f5a9c92bdc9ab46d3ec92
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diff --git a/absl/time/civil_time.cc b/absl/time/civil_time.cc
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+// Copyright 2018 The Abseil Authors.
+//
+// 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
+//
+// http://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.
+
+#include "absl/time/civil_time.h"
+
+#include <cstdlib>
+#include <string>
+
+#include "absl/strings/str_cat.h"
+#include "absl/time/time.h"
+
+namespace absl {
+
+namespace {
+
+// Since a civil time has a larger year range than absl::Time (64-bit years vs
+// 64-bit seconds, respectively) we normalize years to roughly +/- 400 years
+// around the year 2400, which will produce an equivalent year in a range that
+// absl::Time can handle.
+inline civil_year_t NormalizeYear(civil_year_t year) {
+ return 2400 + year % 400;
+}
+
+// Formats the given CivilSecond according to the given format.
+std::string FormatYearAnd(string_view fmt, CivilSecond cs) {
+ const CivilSecond ncs(NormalizeYear(cs.year()), cs.month(), cs.day(),
+ cs.hour(), cs.minute(), cs.second());
+ const TimeZone utc = UTCTimeZone();
+ // TODO(absl-team): Avoid conversion of fmt std::string.
+ return StrCat(cs.year(), FormatTime(std::string(fmt), FromCivil(ncs, utc), utc));
+}
+
+} // namespace
+
+std::string FormatCivilTime(CivilSecond c) {
+ return FormatYearAnd("-%m-%dT%H:%M:%S", c);
+}
+std::string FormatCivilTime(CivilMinute c) {
+ return FormatYearAnd("-%m-%dT%H:%M", c);
+}
+std::string FormatCivilTime(CivilHour c) {
+ return FormatYearAnd("-%m-%dT%H", c);
+}
+std::string FormatCivilTime(CivilDay c) {
+ return FormatYearAnd("-%m-%d", c);
+}
+std::string FormatCivilTime(CivilMonth c) {
+ return FormatYearAnd("-%m", c);
+}
+std::string FormatCivilTime(CivilYear c) {
+ return FormatYearAnd("", c);
+}
+
+namespace time_internal {
+
+std::ostream& operator<<(std::ostream& os, CivilYear y) {
+ return os << FormatCivilTime(y);
+}
+std::ostream& operator<<(std::ostream& os, CivilMonth m) {
+ return os << FormatCivilTime(m);
+}
+std::ostream& operator<<(std::ostream& os, CivilDay d) {
+ return os << FormatCivilTime(d);
+}
+std::ostream& operator<<(std::ostream& os, CivilHour h) {
+ return os << FormatCivilTime(h);
+}
+std::ostream& operator<<(std::ostream& os, CivilMinute m) {
+ return os << FormatCivilTime(m);
+}
+std::ostream& operator<<(std::ostream& os, CivilSecond s) {
+ return os << FormatCivilTime(s);
+}
+
+} // namespace time_internal
+
+} // namespace absl