1 /* 2 * Copyright 2020 Google LLC 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef FCP_TESTING_PARSE_TEXT_PROTO_H_ 18 #define FCP_TESTING_PARSE_TEXT_PROTO_H_ 19 20 #include <type_traits> 21 22 #include "google/protobuf/text_format.h" 23 #include "absl/strings/string_view.h" 24 #include "fcp/base/monitoring.h" 25 26 namespace fcp { 27 28 // Convenience macro for parsing text formatted protos in test code. 29 // The input string should include only the proto fields but not the proto 30 // itself. For example: 31 // 32 // const MyProtoType foo = PARSE_TEXT_PROTO("foo:1 sub { bar:2 }"); 33 // const MyProtoType bar = PARSE_TEXT_PROTO(R"( 34 // foo: 1 35 // sub { 36 // bar: 2 37 // })"); 38 // 39 // Note that the output of the macro has to be assigned to proper proto message 40 // type in order for the parsing to work. 41 #define PARSE_TEXT_PROTO(STR) ParseProtoHelper(STR) 42 43 class ParseProtoHelper { 44 public: ParseProtoHelper(absl::string_view string_view)45 explicit ParseProtoHelper(absl::string_view string_view) 46 : string_view_(string_view) {} 47 48 template <class T> T()49 operator T() { // NOLINT 50 static_assert(std::is_base_of<google::protobuf::Message, T>::value && 51 !std::is_same<google::protobuf::Message, T>::value); 52 T msg; 53 FCP_CHECK(google::protobuf::TextFormat::ParseFromString( 54 std::string(string_view_), // NOLINT(OSS) 55 &msg)); 56 return msg; 57 } 58 59 private: 60 absl::string_view string_view_; 61 }; 62 63 } // namespace fcp 64 65 #endif // FCP_TESTING_PARSE_TEXT_PROTO_H_ 66