Squashed 'third_party/abseil/' content from commit ddf8e52a2
Change-Id: I330cdc687395c6605ad027b855e313ff4a2059e9
git-subtree-dir: third_party/abseil
git-subtree-split: ddf8e52a2918dd0ccec75d3e2426125fa3926724
diff --git a/absl/time/format.cc b/absl/time/format.cc
new file mode 100644
index 0000000..d6ca860
--- /dev/null
+++ b/absl/time/format.cc
@@ -0,0 +1,140 @@
+// 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