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/*
* Copyright 2018 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "rtc_base/experiments/field_trial_units.h"
#include <stdio.h>
#include <limits>
#include <string>
#include "absl/strings/string_view.h"
#include "absl/types/optional.h"
// Large enough to fit "seconds", the longest supported unit name.
#define RTC_TRIAL_UNIT_LENGTH_STR "7"
#define RTC_TRIAL_UNIT_SIZE 8
namespace webrtc {
namespace {
struct ValueWithUnit {
double value;
std::string unit;
};
absl::optional<ValueWithUnit> ParseValueWithUnit(absl::string_view str) {
if (str == "inf") {
return ValueWithUnit{std::numeric_limits<double>::infinity(), ""};
} else if (str == "-inf") {
return ValueWithUnit{-std::numeric_limits<double>::infinity(), ""};
} else {
double double_val;
char unit_char[RTC_TRIAL_UNIT_SIZE];
unit_char[0] = 0;
if (sscanf(std::string(str).c_str(), "%lf%" RTC_TRIAL_UNIT_LENGTH_STR "s",
&double_val, unit_char) >= 1) {
return ValueWithUnit{double_val, unit_char};
}
}
return absl::nullopt;
}
} // namespace
template <>
absl::optional<DataRate> ParseTypedParameter<DataRate>(absl::string_view str) {
absl::optional<ValueWithUnit> result = ParseValueWithUnit(str);
if (result) {
if (result->unit.empty() || result->unit == "kbps") {
return DataRate::KilobitsPerSec(result->value);
} else if (result->unit == "bps") {
return DataRate::BitsPerSec(result->value);
}
}
return absl::nullopt;
}
template <>
absl::optional<DataSize> ParseTypedParameter<DataSize>(absl::string_view str) {
absl::optional<ValueWithUnit> result = ParseValueWithUnit(str);
if (result) {
if (result->unit.empty() || result->unit == "bytes")
return DataSize::Bytes(result->value);
}
return absl::nullopt;
}
template <>
absl::optional<TimeDelta> ParseTypedParameter<TimeDelta>(
absl::string_view str) {
absl::optional<ValueWithUnit> result = ParseValueWithUnit(str);
if (result) {
if (result->unit == "s" || result->unit == "seconds") {
return TimeDelta::Seconds(result->value);
} else if (result->unit == "us") {
return TimeDelta::Micros(result->value);
} else if (result->unit.empty() || result->unit == "ms") {
return TimeDelta::Millis(result->value);
}
}
return absl::nullopt;
}
template <>
absl::optional<absl::optional<DataRate>>
ParseTypedParameter<absl::optional<DataRate>>(absl::string_view str) {
return ParseOptionalParameter<DataRate>(str);
}
template <>
absl::optional<absl::optional<DataSize>>
ParseTypedParameter<absl::optional<DataSize>>(absl::string_view str) {
return ParseOptionalParameter<DataSize>(str);
}
template <>
absl::optional<absl::optional<TimeDelta>>
ParseTypedParameter<absl::optional<TimeDelta>>(absl::string_view str) {
return ParseOptionalParameter<TimeDelta>(str);
}
template class FieldTrialParameter<DataRate>;
template class FieldTrialParameter<DataSize>;
template class FieldTrialParameter<TimeDelta>;
template class FieldTrialConstrained<DataRate>;
template class FieldTrialConstrained<DataSize>;
template class FieldTrialConstrained<TimeDelta>;
template class FieldTrialOptional<DataRate>;
template class FieldTrialOptional<DataSize>;
template class FieldTrialOptional<TimeDelta>;
} // namespace webrtc
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