Sebastian Jansson | 55251c3 | 2019-08-08 11:14:51 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2019 The WebRTC project authors. All Rights Reserved. |
| 3 | * |
| 4 | * Use of this source code is governed by a BSD-style license |
| 5 | * that can be found in the LICENSE file in the root of the source |
| 6 | * tree. An additional intellectual property rights grant can be found |
| 7 | * in the file PATENTS. All contributing project authors may |
| 8 | * be found in the AUTHORS file in the root of the source tree. |
| 9 | */ |
| 10 | #ifndef RTC_BASE_EXPERIMENTS_STRUCT_PARAMETERS_PARSER_H_ |
| 11 | #define RTC_BASE_EXPERIMENTS_STRUCT_PARAMETERS_PARSER_H_ |
| 12 | |
| 13 | #include <functional> |
| 14 | #include <map> |
| 15 | #include <memory> |
| 16 | #include <string> |
| 17 | #include <utility> |
| 18 | #include <vector> |
| 19 | |
| 20 | #include "absl/memory/memory.h" |
| 21 | #include "absl/strings/string_view.h" |
| 22 | #include "absl/types/optional.h" |
| 23 | #include "rtc_base/experiments/field_trial_parser.h" |
| 24 | #include "rtc_base/experiments/field_trial_units.h" |
| 25 | #include "rtc_base/string_encode.h" |
| 26 | |
| 27 | namespace webrtc { |
| 28 | namespace struct_parser_impl { |
Sebastian Jansson | 0ee8008 | 2019-08-14 13:16:26 +0200 | [diff] [blame] | 29 | struct TypedMemberParser { |
| 30 | public: |
| 31 | bool (*parse)(const absl::string_view src, void* target); |
| 32 | void (*encode)(const void* src, std::string* target); |
| 33 | }; |
| 34 | |
| 35 | struct MemberParameter { |
| 36 | const char* key; |
| 37 | void* member_ptr; |
| 38 | TypedMemberParser parser; |
| 39 | }; |
Sebastian Jansson | 55251c3 | 2019-08-08 11:14:51 +0200 | [diff] [blame] | 40 | |
| 41 | template <typename T> |
Sebastian Jansson | 0ee8008 | 2019-08-14 13:16:26 +0200 | [diff] [blame] | 42 | class TypedParser { |
| 43 | public: |
| 44 | static bool Parse(absl::string_view src, void* target); |
| 45 | static void Encode(const void* src, std::string* target); |
| 46 | }; |
| 47 | |
| 48 | // Instantiated in cc file to avoid duplication during compile. Add additional |
| 49 | // parsers as needed. Generally, try to use these suggested types even if the |
| 50 | // context where the value is used might require a different type. For instance, |
| 51 | // a size_t representing a packet size should use an int parameter as there's no |
| 52 | // need to support packet sizes larger than INT32_MAX. |
| 53 | extern template class TypedParser<bool>; |
| 54 | extern template class TypedParser<double>; |
| 55 | extern template class TypedParser<int>; |
| 56 | extern template class TypedParser<absl::optional<double>>; |
| 57 | extern template class TypedParser<absl::optional<int>>; |
| 58 | |
| 59 | extern template class TypedParser<DataRate>; |
| 60 | extern template class TypedParser<DataSize>; |
| 61 | extern template class TypedParser<TimeDelta>; |
| 62 | extern template class TypedParser<absl::optional<DataRate>>; |
| 63 | extern template class TypedParser<absl::optional<DataSize>>; |
| 64 | extern template class TypedParser<absl::optional<TimeDelta>>; |
Sebastian Jansson | 55251c3 | 2019-08-08 11:14:51 +0200 | [diff] [blame] | 65 | |
| 66 | template <typename T> |
Sebastian Jansson | 0ee8008 | 2019-08-14 13:16:26 +0200 | [diff] [blame] | 67 | void AddMembers(MemberParameter* out, const char* key, T* member) { |
| 68 | *out = MemberParameter{ |
| 69 | key, member, |
| 70 | TypedMemberParser{&TypedParser<T>::Parse, &TypedParser<T>::Encode}}; |
Sebastian Jansson | 55251c3 | 2019-08-08 11:14:51 +0200 | [diff] [blame] | 71 | } |
| 72 | |
Sebastian Jansson | 0ee8008 | 2019-08-14 13:16:26 +0200 | [diff] [blame] | 73 | template <typename T, typename... Args> |
| 74 | void AddMembers(MemberParameter* out, |
| 75 | const char* key, |
| 76 | T* member, |
| 77 | Args... args) { |
| 78 | AddMembers(out, key, member); |
| 79 | AddMembers(++out, args...); |
Sebastian Jansson | 55251c3 | 2019-08-08 11:14:51 +0200 | [diff] [blame] | 80 | } |
Sebastian Jansson | 55251c3 | 2019-08-08 11:14:51 +0200 | [diff] [blame] | 81 | } // namespace struct_parser_impl |
| 82 | |
Sebastian Jansson | 55251c3 | 2019-08-08 11:14:51 +0200 | [diff] [blame] | 83 | class StructParametersParser { |
| 84 | public: |
Sebastian Jansson | 0ee8008 | 2019-08-14 13:16:26 +0200 | [diff] [blame] | 85 | template <typename T, typename... Args> |
| 86 | static std::unique_ptr<StructParametersParser> Create(const char* first_key, |
| 87 | T* first_member, |
| 88 | Args... args) { |
| 89 | std::vector<struct_parser_impl::MemberParameter> members( |
| 90 | sizeof...(args) / 2 + 1); |
| 91 | struct_parser_impl::AddMembers(&members.front(), std::move(first_key), |
| 92 | first_member, args...); |
| 93 | return absl::WrapUnique(new StructParametersParser(std::move(members))); |
Sebastian Jansson | 55251c3 | 2019-08-08 11:14:51 +0200 | [diff] [blame] | 94 | } |
| 95 | |
Sebastian Jansson | 0ee8008 | 2019-08-14 13:16:26 +0200 | [diff] [blame] | 96 | void Parse(absl::string_view src); |
| 97 | std::string Encode() const; |
Sebastian Jansson | 55251c3 | 2019-08-08 11:14:51 +0200 | [diff] [blame] | 98 | |
| 99 | private: |
Sebastian Jansson | 55251c3 | 2019-08-08 11:14:51 +0200 | [diff] [blame] | 100 | explicit StructParametersParser( |
Sebastian Jansson | 0ee8008 | 2019-08-14 13:16:26 +0200 | [diff] [blame] | 101 | std::vector<struct_parser_impl::MemberParameter> members); |
Sebastian Jansson | 55251c3 | 2019-08-08 11:14:51 +0200 | [diff] [blame] | 102 | |
Sebastian Jansson | 0ee8008 | 2019-08-14 13:16:26 +0200 | [diff] [blame] | 103 | std::vector<struct_parser_impl::MemberParameter> members_; |
Sebastian Jansson | 55251c3 | 2019-08-08 11:14:51 +0200 | [diff] [blame] | 104 | }; |
| 105 | |
Sebastian Jansson | 55251c3 | 2019-08-08 11:14:51 +0200 | [diff] [blame] | 106 | } // namespace webrtc |
| 107 | |
| 108 | #endif // RTC_BASE_EXPERIMENTS_STRUCT_PARAMETERS_PARSER_H_ |