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/*
*
* Copyright 2015 gRPC authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
// Generates Objective C gRPC service interface out of Protobuf IDL.
#include <memory>
#include "src/compiler/config.h"
#include "src/compiler/objective_c_generator.h"
#include "src/compiler/objective_c_generator_helpers.h"
#include <google/protobuf/compiler/objectivec/objectivec_helpers.h>
using ::google::protobuf::compiler::objectivec::
IsProtobufLibraryBundledProtoFile;
using ::google::protobuf::compiler::objectivec::ProtobufLibraryFrameworkName;
namespace {
inline ::grpc::string LocalImport(const ::grpc::string &import) {
return ::grpc::string("#import \"" + import + "\"\n");
}
inline ::grpc::string SystemImport(const ::grpc::string &import) {
return ::grpc::string("#import <" + import + ">\n");
}
// Preprocessor condition flags.
using PreprocConditionFlag = uint32_t;
constexpr PreprocConditionFlag kInvertCondition = 0b0001;
constexpr PreprocConditionFlag kCheckIfDefined = 0b0010;
// Convenience flag set.
constexpr PreprocConditionFlag kIfNotOrNotDefined =
kInvertCondition | kCheckIfDefined;
inline ::grpc::string PreprocConditional(::grpc::string symbol,
PreprocConditionFlag flags) {
if (flags & kCheckIfDefined) {
return (flags & kInvertCondition)
? "!defined(" + symbol + ") || !" + symbol
: "defined(" + symbol + ") && " + symbol;
} else {
return (flags & kInvertCondition)
? "!" + symbol
: symbol;
}
}
inline ::grpc::string PreprocIf(const ::grpc::string& symbol,
const ::grpc::string& if_true,
PreprocConditionFlag flags = 0) {
::grpc::string condition = PreprocConditional(symbol, flags);
return ::grpc::string("#if " + condition + "\n" + if_true + "#endif\n");
}
inline ::grpc::string PreprocIfElse(const ::grpc::string& symbol,
const ::grpc::string& if_true,
const ::grpc::string& if_false,
PreprocConditionFlag flags = 0) {
::grpc::string condition = PreprocConditional(symbol, flags);
return ::grpc::string("#if " + condition + "\n" +
if_true + "#else\n" + if_false + "#endif\n");
}
inline ::grpc::string ImportProtoHeaders(
const grpc::protobuf::FileDescriptor* dep,
const char *indent) {
::grpc::string header = grpc_objective_c_generator::MessageHeaderName(dep);
if (!IsProtobufLibraryBundledProtoFile(dep)) {
return indent + LocalImport(header);
}
::grpc::string base_name = header;
grpc_generator::StripPrefix(&base_name, "google/protobuf/");
// create the import code snippet
::grpc::string framework_header =
::grpc::string(ProtobufLibraryFrameworkName) + "/" + base_name;
static const ::grpc::string kFrameworkImportsCondition =
"GPB_USE_PROTOBUF_FRAMEWORK_IMPORTS";
return PreprocIfElse(kFrameworkImportsCondition,
indent + SystemImport(framework_header),
indent + LocalImport(header),
kCheckIfDefined);
}
} // namespace
class ObjectiveCGrpcGenerator : public grpc::protobuf::compiler::CodeGenerator {
public:
ObjectiveCGrpcGenerator() {}
virtual ~ObjectiveCGrpcGenerator() {}
private:
static const ::grpc::string kNonNullBegin = "NS_ASSUME_NONNULL_BEGIN\n";
static const ::grpc::string kNonNullEnd = "NS_ASSUME_NONNULL_END\n";
static const ::grpc::string kProtocolOnly = "GPB_GRPC_PROTOCOL_ONLY";
static const ::grpc::string kForwardDeclare =
"GPB_GRPC_FORWARD_DECLARE_MESSAGE_PROTO";
public:
virtual bool Generate(const grpc::protobuf::FileDescriptor* file,
const ::grpc::string& parameter,
grpc::protobuf::compiler::GeneratorContext* context,
::grpc::string* error) const {
if (file->service_count() == 0) {
// No services. Do nothing.
return true;
}
auto OmitIf = [](const ::grpc::string& s, const ::grpc::string& v) {
return PreprocIf(s, v, kInvertCondition | kCheckIfDefined);
};
::grpc::string file_name =
google::protobuf::compiler::objectivec::FilePath(file);
{
// Generate .pbrpc.h
::grpc::string imports = LocalImport(file_name + ".pbobjc.h");
::grpc::string system_imports =
SystemImport("ProtoRPC/ProtoService.h") +
SystemImport("ProtoRPC/ProtoRPC.h") +
SystemImport("RxLibrary/GRXWriteable.h") +
SystemImport("RxLibrary/GRXWriter.h");
::grpc::string forward_declarations = "@class GRPCProtoCall;\n\n";
::grpc::string class_declarations =
grpc_objective_c_generator::GetAllMessageClasses(file);
::grpc::string class_imports;
for (int i = 0; i < file->dependency_count(); i++) {
class_imports += ImportProtoHeaders(file->dependency(i), " ");
}
::grpc::string protocols;
for (int i = 0; i < file->service_count(); i++) {
const grpc::protobuf::ServiceDescriptor* service = file->service(i);
protocols += grpc_objective_c_generator::GetProtocol(service);
}
::grpc::string interfaces;
for (int i = 0; i < file->service_count(); i++) {
const grpc::protobuf::ServiceDescriptor* service = file->service(i);
interfaces += grpc_objective_c_generator::GetInterface(service);
}
Write(context, file_name + ".pbrpc.h",
OmitIf(kForwardDeclare, imports) + "\n" +
OmitIf(kProtocolOnly, system_imports) + "\n" +
PreprocIfElse(kForwardDeclare, class_declarations, class_imports,
kCheckIfDefined) + "\n" +
forward_declarations + "\n" +
kNonNullBegin + "\n" +
protocols + "\n" +
OmitIf(kProtocolOnly, interfaces) + "\n" +
kNonNullEnd + "\n");
}
{
// Generate .pbrpc.m
::grpc::string imports =
LocalImport(file_name + ".pbrpc.h") +
LocalImport(file_name + ".pbobjc.h") +
SystemImport("ProtoRPC/ProtoRPC.h") +
SystemImport("RxLibrary/GRXWriter+Immediate.h");
::grpc::string class_imports;
for (int i = 0; i < file->dependency_count(); i++) {
class_imports += ImportProtoHeaders(file->dependency(i), "");
}
::grpc::string definitions;
for (int i = 0; i < file->service_count(); i++) {
const grpc::protobuf::ServiceDescriptor* service = file->service(i);
definitions += grpc_objective_c_generator::GetSource(service);
}
Write(context, file_name + ".pbrpc.m",
OmitIf(kProtocolOnly,
imports + "\n" + class_imports + "\n" + definitions));
}
return true;
}
private:
// Write the given code into the given file.
void Write(grpc::protobuf::compiler::GeneratorContext* context,
const ::grpc::string& filename, const ::grpc::string& code) const {
std::unique_ptr<grpc::protobuf::io::ZeroCopyOutputStream> output(
context->Open(filename));
grpc::protobuf::io::CodedOutputStream coded_out(output.get());
coded_out.WriteRaw(code.data(), code.size());
}
};
int main(int argc, char* argv[]) {
ObjectiveCGrpcGenerator generator;
return grpc::protobuf::compiler::PluginMain(argc, argv, &generator);
}
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