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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef BASE_TIME_TIME_DELTA_FROM_STRING_H_
#define BASE_TIME_TIME_DELTA_FROM_STRING_H_
#include "base/base_export.h"
#include "base/strings/string_piece.h"
#include "third_party/abseil-cpp/absl/types/optional.h"
namespace base {
class TimeDelta;
// Helper function for TimeDelta.
// This is not part of TimeDelta to avoid dragging the includes above into
// base/time/time.h.
//
// Adapted from Go's doc at https://golang.org/pkg/time/#ParseDuration
// [ParseDuration] parses a duration string. A duration string is
// a possibly signed sequence of decimal numbers, each with optional
// fraction and a unit suffix, such as "300ms", "-1.5h" or "2h45m".
// Valid time units are "ns", "us" "ms", "s", "m", "h", "d".
//
// Special values that are allowed without specifying units:
// "0", "+0", "-0" -> TimeDelta()
// "inf", "+inf" -> TimeDelta::Max()
// "-inf" -> TimeDelta::Min()
// Returns `absl::nullopt` when parsing fails. Numbers larger than 2^63-1
// will fail parsing. Overflowing `number * unit` will return +/-inf, as
// appropriate.
BASE_EXPORT absl::optional<TimeDelta> TimeDeltaFromString(
StringPiece duration_string);
} // namespace base
#endif // BASE_TIME_TIME_DELTA_FROM_STRING_H_
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