// Copyright 2017 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 // // 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. #include <string.h> #include <cctype> #include <cstdint> #include "absl/time/internal/cctz/include/cctz/time_zone.h" #include "absl/time/time.h" namespace cctz = absl::time_internal::cctz; namespace absl { extern const char RFC3339_full[] = "%Y-%m-%dT%H:%M:%E*S%Ez"; extern const char RFC3339_sec[] = "%Y-%m-%dT%H:%M:%S%Ez"; extern const char RFC1123_full[] = "%a, %d %b %E4Y %H:%M:%S %z"; extern const char RFC1123_no_wday[] = "%d %b %E4Y %H:%M:%S %z"; namespace { const char kInfiniteFutureStr[] = "infinite-future"; const char kInfinitePastStr[] = "infinite-past"; struct cctz_parts { cctz::time_point<cctz::seconds> sec; cctz::detail::femtoseconds fem; }; inline cctz::time_point<cctz::seconds> unix_epoch() { return std::chrono::time_point_cast<cctz::seconds>( std::chrono::system_clock::from_time_t(0)); } // Splits a Time into seconds and femtoseconds, which can be used with CCTZ. // Requires that 't' is finite. See duration.cc for details about rep_hi and // rep_lo. cctz_parts Split(absl::Time t) { const auto d = time_internal::ToUnixDuration(t); const int64_t rep_hi = time_internal::GetRepHi(d); const int64_t rep_lo = time_internal::GetRepLo(d); const auto sec = unix_epoch() + cctz::seconds(rep_hi); const auto fem = cctz::detail::femtoseconds(rep_lo * (1000 * 1000 / 4)); return {sec, fem}; } // Joins the given seconds and femtoseconds into a Time. See duration.cc for // details about rep_hi and rep_lo. absl::Time Join(const cctz_parts& parts) { const int64_t rep_hi = (parts.sec - unix_epoch()).count(); const uint32_t rep_lo = parts.fem.count() / (1000 * 1000 / 4); const auto d = time_internal::MakeDuration(rep_hi, rep_lo); return time_internal::FromUnixDuration(d); } } // namespace std::string FormatTime(const std::string& format, absl::Time t, absl::TimeZone tz) { if (t == absl::InfiniteFuture()) return kInfiniteFutureStr; if (t == absl::InfinitePast()) return kInfinitePastStr; const auto parts = Split(t); return cctz::detail::format(format, parts.sec, parts.fem, cctz::time_zone(tz)); } std::string FormatTime(absl::Time t, absl::TimeZone tz) { return FormatTime(RFC3339_full, t, tz); } std::string FormatTime(absl::Time t) { return absl::FormatTime(RFC3339_full, t, absl::LocalTimeZone()); } bool ParseTime(const std::string& format, const std::string& input, absl::Time* time, std::string* err) { return absl::ParseTime(format, input, absl::UTCTimeZone(), time, err); } // If the input string does not contain an explicit UTC offset, interpret // the fields with respect to the given TimeZone. bool ParseTime(const std::string& format, const std::string& input, absl::TimeZone tz, absl::Time* time, std::string* err) { const char* data = input.c_str(); while (std::isspace(*data)) ++data; size_t inf_size = strlen(kInfiniteFutureStr); if (strncmp(data, kInfiniteFutureStr, inf_size) == 0) { const char* new_data = data + inf_size; while (std::isspace(*new_data)) ++new_data; if (*new_data == '\0') { *time = InfiniteFuture(); return true; } } inf_size = strlen(kInfinitePastStr); if (strncmp(data, kInfinitePastStr, inf_size) == 0) { const char* new_data = data + inf_size; while (std::isspace(*new_data)) ++new_data; if (*new_data == '\0') { *time = InfinitePast(); return true; } } std::string error; cctz_parts parts; const bool b = cctz::detail::parse(format, input, cctz::time_zone(tz), &parts.sec, &parts.fem, &error); if (b) { *time = Join(parts); } else if (err != nullptr) { *err = error; } return b; } // Functions required to support absl::Time flags. bool ParseFlag(const std::string& text, absl::Time* t, std::string* error) { return absl::ParseTime(RFC3339_full, text, absl::UTCTimeZone(), t, error); } std::string UnparseFlag(absl::Time t) { return absl::FormatTime(RFC3339_full, t, absl::UTCTimeZone()); } } // namespace absl