Abseil Common Libraries (C++) (grcp 依赖)
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89 lines
2.7 KiB
89 lines
2.7 KiB
6 years ago
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// Copyright 2018 The Abseil Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "absl/time/civil_time.h"
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#include <cstdlib>
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#include <string>
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#include "absl/strings/str_cat.h"
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#include "absl/time/time.h"
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namespace absl {
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namespace {
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// Since a civil time has a larger year range than absl::Time (64-bit years vs
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// 64-bit seconds, respectively) we normalize years to roughly +/- 400 years
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// around the year 2400, which will produce an equivalent year in a range that
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// absl::Time can handle.
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inline civil_year_t NormalizeYear(civil_year_t year) {
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return 2400 + year % 400;
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}
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// Formats the given CivilSecond according to the given format.
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std::string FormatYearAnd(string_view fmt, CivilSecond cs) {
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const CivilSecond ncs(NormalizeYear(cs.year()), cs.month(), cs.day(),
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cs.hour(), cs.minute(), cs.second());
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const TimeZone utc = UTCTimeZone();
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// TODO(absl-team): Avoid conversion of fmt std::string.
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return StrCat(cs.year(), FormatTime(std::string(fmt), FromCivil(ncs, utc), utc));
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}
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} // namespace
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std::string FormatCivilTime(CivilSecond c) {
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return FormatYearAnd("-%m-%dT%H:%M:%S", c);
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}
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std::string FormatCivilTime(CivilMinute c) {
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return FormatYearAnd("-%m-%dT%H:%M", c);
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}
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std::string FormatCivilTime(CivilHour c) {
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return FormatYearAnd("-%m-%dT%H", c);
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}
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std::string FormatCivilTime(CivilDay c) {
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return FormatYearAnd("-%m-%d", c);
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}
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std::string FormatCivilTime(CivilMonth c) {
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return FormatYearAnd("-%m", c);
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}
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std::string FormatCivilTime(CivilYear c) {
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return FormatYearAnd("", c);
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}
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namespace time_internal {
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std::ostream& operator<<(std::ostream& os, CivilYear y) {
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return os << FormatCivilTime(y);
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}
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std::ostream& operator<<(std::ostream& os, CivilMonth m) {
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return os << FormatCivilTime(m);
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}
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std::ostream& operator<<(std::ostream& os, CivilDay d) {
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return os << FormatCivilTime(d);
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}
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std::ostream& operator<<(std::ostream& os, CivilHour h) {
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return os << FormatCivilTime(h);
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}
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std::ostream& operator<<(std::ostream& os, CivilMinute m) {
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return os << FormatCivilTime(m);
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}
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std::ostream& operator<<(std::ostream& os, CivilSecond s) {
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return os << FormatCivilTime(s);
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}
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} // namespace time_internal
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} // namespace absl
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