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/*
* Copyright (c) 2019 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/struct_parameters_parser.h"
#include <algorithm>
#include "absl/strings/string_view.h"
#include "rtc_base/logging.h"
namespace webrtc {
namespace {
size_t FindOrEnd(absl::string_view str, size_t start, char delimiter) {
size_t pos = str.find(delimiter, start);
pos = (pos == absl::string_view::npos) ? str.length() : pos;
return pos;
}
} // namespace
namespace struct_parser_impl {
namespace {
inline void StringEncode(std::string* target, bool val) {
*target += BoolToString(val);
}
inline void StringEncode(std::string* target, double val) {
*target += absl::StrCat(val);
}
inline void StringEncode(std::string* target, int val) {
*target += absl::StrCat(val);
}
inline void StringEncode(std::string* target, unsigned val) {
*target += absl::StrCat(val);
}
inline void StringEncode(std::string* target, DataRate val) {
*target += ToString(val);
}
inline void StringEncode(std::string* target, DataSize val) {
*target += ToString(val);
}
inline void StringEncode(std::string* target, TimeDelta val) {
*target += ToString(val);
}
template <typename T>
inline void StringEncode(std::string* sb, std::optional<T> val) {
if (val)
StringEncode(sb, *val);
}
} // namespace
template <typename T>
bool TypedParser<T>::Parse(absl::string_view src, void* target) {
auto parsed = ParseTypedParameter<T>(std::string(src));
if (parsed.has_value())
*reinterpret_cast<T*>(target) = *parsed;
return parsed.has_value();
}
template <typename T>
void TypedParser<T>::Encode(const void* src, std::string* target) {
StringEncode(target, *reinterpret_cast<const T*>(src));
}
template class TypedParser<bool>;
template class TypedParser<double>;
template class TypedParser<int>;
template class TypedParser<unsigned>;
template class TypedParser<std::optional<double>>;
template class TypedParser<std::optional<int>>;
template class TypedParser<std::optional<unsigned>>;
template class TypedParser<DataRate>;
template class TypedParser<DataSize>;
template class TypedParser<TimeDelta>;
template class TypedParser<std::optional<DataRate>>;
template class TypedParser<std::optional<DataSize>>;
template class TypedParser<std::optional<TimeDelta>>;
} // namespace struct_parser_impl
StructParametersParser::StructParametersParser(
std::vector<struct_parser_impl::MemberParameter> members)
: members_(std::move(members)) {}
void StructParametersParser::Parse(absl::string_view src) {
size_t i = 0;
while (i < src.length()) {
size_t val_end = FindOrEnd(src, i, ',');
size_t colon_pos = FindOrEnd(src, i, ':');
size_t key_end = std::min(val_end, colon_pos);
size_t val_begin = key_end + 1u;
absl::string_view key(src.substr(i, key_end - i));
absl::string_view opt_value;
if (val_end >= val_begin)
opt_value = src.substr(val_begin, val_end - val_begin);
i = val_end + 1u;
bool found = false;
for (auto& member : members_) {
if (key == member.key) {
found = true;
if (!member.parser.parse(opt_value, member.member_ptr)) {
RTC_LOG(LS_WARNING) << "Failed to read field with key: '" << key
<< "' in trial: \"" << src << "\"";
}
break;
}
}
// "_" is be used to prefix keys that are part of the string for
// debugging purposes but not neccessarily used.
// e.g. WebRTC-Experiment/param: value, _DebuggingString
if (!found && (key.empty() || key[0] != '_')) {
RTC_LOG(LS_INFO) << "No field with key: '" << key
<< "' (found in trial: \"" << src << "\")";
}
}
}
std::string StructParametersParser::Encode() const {
std::string res;
bool first = true;
for (const auto& member : members_) {
if (!first)
res += ",";
res += member.key;
res += ":";
member.parser.encode(member.member_ptr, &res);
first = false;
}
return res;
}
} // namespace webrtc
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