mirror of
https://github.com/DrKLO/Telegram.git
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160 lines
5.2 KiB
C++
160 lines
5.2 KiB
C++
// Copyright 2017 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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// https://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 <string.h>
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#include <cctype>
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#include <cstdint>
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#include "absl/strings/match.h"
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#include "absl/strings/string_view.h"
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#include "absl/time/internal/cctz/include/cctz/time_zone.h"
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#include "absl/time/time.h"
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namespace cctz = absl::time_internal::cctz;
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namespace absl {
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ABSL_NAMESPACE_BEGIN
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ABSL_DLL extern const char RFC3339_full[] = "%Y-%m-%d%ET%H:%M:%E*S%Ez";
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ABSL_DLL extern const char RFC3339_sec[] = "%Y-%m-%d%ET%H:%M:%S%Ez";
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ABSL_DLL extern const char RFC1123_full[] = "%a, %d %b %E4Y %H:%M:%S %z";
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ABSL_DLL extern const char RFC1123_no_wday[] = "%d %b %E4Y %H:%M:%S %z";
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namespace {
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const char kInfiniteFutureStr[] = "infinite-future";
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const char kInfinitePastStr[] = "infinite-past";
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struct cctz_parts {
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cctz::time_point<cctz::seconds> sec;
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cctz::detail::femtoseconds fem;
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};
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inline cctz::time_point<cctz::seconds> unix_epoch() {
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return std::chrono::time_point_cast<cctz::seconds>(
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std::chrono::system_clock::from_time_t(0));
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}
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// Splits a Time into seconds and femtoseconds, which can be used with CCTZ.
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// Requires that 't' is finite. See duration.cc for details about rep_hi and
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// rep_lo.
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cctz_parts Split(absl::Time t) {
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const auto d = time_internal::ToUnixDuration(t);
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const int64_t rep_hi = time_internal::GetRepHi(d);
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const int64_t rep_lo = time_internal::GetRepLo(d);
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const auto sec = unix_epoch() + cctz::seconds(rep_hi);
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const auto fem = cctz::detail::femtoseconds(rep_lo * (1000 * 1000 / 4));
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return {sec, fem};
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}
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// Joins the given seconds and femtoseconds into a Time. See duration.cc for
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// details about rep_hi and rep_lo.
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absl::Time Join(const cctz_parts& parts) {
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const int64_t rep_hi = (parts.sec - unix_epoch()).count();
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const uint32_t rep_lo = parts.fem.count() / (1000 * 1000 / 4);
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const auto d = time_internal::MakeDuration(rep_hi, rep_lo);
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return time_internal::FromUnixDuration(d);
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}
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} // namespace
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std::string FormatTime(absl::string_view format, absl::Time t,
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absl::TimeZone tz) {
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if (t == absl::InfiniteFuture()) return std::string(kInfiniteFutureStr);
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if (t == absl::InfinitePast()) return std::string(kInfinitePastStr);
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const auto parts = Split(t);
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return cctz::detail::format(std::string(format), parts.sec, parts.fem,
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cctz::time_zone(tz));
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}
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std::string FormatTime(absl::Time t, absl::TimeZone tz) {
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return FormatTime(RFC3339_full, t, tz);
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}
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std::string FormatTime(absl::Time t) {
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return absl::FormatTime(RFC3339_full, t, absl::LocalTimeZone());
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}
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bool ParseTime(absl::string_view format, absl::string_view input,
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absl::Time* time, std::string* err) {
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return absl::ParseTime(format, input, absl::UTCTimeZone(), time, err);
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}
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// If the input string does not contain an explicit UTC offset, interpret
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// the fields with respect to the given TimeZone.
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bool ParseTime(absl::string_view format, absl::string_view input,
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absl::TimeZone tz, absl::Time* time, std::string* err) {
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auto strip_leading_space = [](absl::string_view* sv) {
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while (!sv->empty()) {
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if (!std::isspace(sv->front())) return;
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sv->remove_prefix(1);
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}
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};
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// Portable toolchains means we don't get nice constexpr here.
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struct Literal {
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const char* name;
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size_t size;
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absl::Time value;
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};
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static Literal literals[] = {
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{kInfiniteFutureStr, strlen(kInfiniteFutureStr), InfiniteFuture()},
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{kInfinitePastStr, strlen(kInfinitePastStr), InfinitePast()},
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};
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strip_leading_space(&input);
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for (const auto& lit : literals) {
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if (absl::StartsWith(input, absl::string_view(lit.name, lit.size))) {
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absl::string_view tail = input;
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tail.remove_prefix(lit.size);
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strip_leading_space(&tail);
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if (tail.empty()) {
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*time = lit.value;
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return true;
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}
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}
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}
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std::string error;
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cctz_parts parts;
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const bool b =
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cctz::detail::parse(std::string(format), std::string(input),
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cctz::time_zone(tz), &parts.sec, &parts.fem, &error);
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if (b) {
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*time = Join(parts);
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} else if (err != nullptr) {
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*err = error;
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}
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return b;
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}
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// Functions required to support absl::Time flags.
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bool AbslParseFlag(absl::string_view text, absl::Time* t, std::string* error) {
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return absl::ParseTime(RFC3339_full, text, absl::UTCTimeZone(), t, error);
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}
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std::string AbslUnparseFlag(absl::Time t) {
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return absl::FormatTime(RFC3339_full, t, absl::UTCTimeZone());
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}
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bool ParseFlag(const std::string& text, absl::Time* t, std::string* error) {
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return absl::ParseTime(RFC3339_full, text, absl::UTCTimeZone(), t, error);
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}
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std::string UnparseFlag(absl::Time t) {
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return absl::FormatTime(RFC3339_full, t, absl::UTCTimeZone());
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}
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ABSL_NAMESPACE_END
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} // namespace absl
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