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/*
*
* Copyright 2015, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <map>
#include <sstream>
#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::ClassName;
using ::grpc::protobuf::io::Printer;
using ::grpc::protobuf::MethodDescriptor;
using ::grpc::protobuf::ServiceDescriptor;
using ::grpc::string;
using ::std::map;
namespace grpc_objective_c_generator {
namespace {
void PrintProtoRpcDeclarationAsPragma(Printer *printer,
const MethodDescriptor *method,
map<string, string> vars) {
vars["client_stream"] = method->client_streaming() ? "stream " : "";
vars["server_stream"] = method->server_streaming() ? "stream " : "";
printer->Print(vars,
"#pragma mark $method_name$($client_stream$$request_type$)"
" returns ($server_stream$$response_type$)\n\n");
}
void PrintMethodSignature(Printer *printer,
const MethodDescriptor *method,
const map<string, string>& vars) {
// TODO(jcanizales): Print method comments.
printer->Print(vars, "- ($return_type$)$method_name$With");
if (method->client_streaming()) {
printer->Print("RequestsWriter:(id<GRXWriter>)request");
} else {
printer->Print(vars, "Request:($request_class$ *)request");
}
// TODO(jcanizales): Put this on a new line and align colons.
// TODO(jcanizales): eventHandler for server streaming?
printer->Print(" handler:(void(^)(");
if (method->server_streaming()) {
printer->Print("BOOL done, ");
}
printer->Print(vars, "$response_class$ *response, NSError *error))handler");
}
void PrintSimpleSignature(Printer *printer,
const MethodDescriptor *method,
map<string, string> vars) {
vars["method_name"] =
grpc_generator::LowercaseFirstLetter(vars["method_name"]);
vars["return_type"] = "void";
PrintMethodSignature(printer, method, vars);
}
void PrintAdvancedSignature(Printer *printer,
const MethodDescriptor *method,
map<string, string> vars) {
vars["method_name"] = "RPCTo" + vars["method_name"];
vars["return_type"] = "ProtoRPC *";
PrintMethodSignature(printer, method, vars);
}
inline map<string, string> GetMethodVars(const MethodDescriptor *method) {
return {{ "method_name", method->name() },
{ "request_type", method->input_type()->name() },
{ "response_type", method->output_type()->name() },
{ "request_class", ClassName(method->input_type()) },
{ "response_class", ClassName(method->output_type()) }};
}
void PrintMethodDeclarations(Printer *printer,
const MethodDescriptor *method) {
map<string, string> vars = GetMethodVars(method);
PrintProtoRpcDeclarationAsPragma(printer, method, vars);
PrintSimpleSignature(printer, method, vars);
printer->Print(";\n\n");
PrintAdvancedSignature(printer, method, vars);
printer->Print(";\n\n\n");
}
void PrintSimpleImplementation(Printer *printer,
const MethodDescriptor *method,
map<string, string> vars) {
printer->Print("{\n");
printer->Print(vars, " [[self RPCTo$method_name$With");
if (method->client_streaming()) {
printer->Print("RequestsWriter:request");
} else {
printer->Print("Request:request");
}
printer->Print(" handler:handler] start];\n");
printer->Print("}\n");
}
void PrintAdvancedImplementation(Printer *printer,
const MethodDescriptor *method,
map<string, string> vars) {
printer->Print("{\n");
printer->Print(vars, " return [self RPCToMethod:@\"$method_name$\"\n");
printer->Print(" requestsWriter:");
if (method->client_streaming()) {
printer->Print("request\n");
} else {
printer->Print("[GRXWriter writerWithValue:request]\n");
}
printer->Print(vars, " responseClass:[$response_class$ class]\n");
printer->Print(" responsesWriteable:[GRXWriteable ");
if (method->server_streaming()) {
printer->Print("writeableWithStreamHandler:handler]];\n");
} else {
printer->Print("writeableWithSingleValueHandler:handler]];\n");
}
printer->Print("}\n");
}
void PrintMethodImplementations(Printer *printer,
const MethodDescriptor *method) {
map<string, string> vars = GetMethodVars(method);
PrintProtoRpcDeclarationAsPragma(printer, method, vars);
// TODO(jcanizales): Print documentation from the method.
PrintSimpleSignature(printer, method, vars);
PrintSimpleImplementation(printer, method, vars);
printer->Print("// Returns a not-yet-started RPC object.\n");
PrintAdvancedSignature(printer, method, vars);
PrintAdvancedImplementation(printer, method, vars);
}
} // namespace
string GetHeader(const ServiceDescriptor *service) {
string output;
{
// Scope the output stream so it closes and finalizes output to the string.
grpc::protobuf::io::StringOutputStream output_stream(&output);
Printer printer(&output_stream, '$');
printer.Print("@protocol GRXWriteable;\n");
printer.Print("@protocol GRXWriter;\n\n");
map<string, string> vars = {{"service_class", ServiceClassName(service)}};
printer.Print(vars, "@protocol $service_class$ <NSObject>\n\n");
for (int i = 0; i < service->method_count(); i++) {
PrintMethodDeclarations(&printer, service->method(i));
}
printer.Print("@end\n\n");
printer.Print("// Basic service implementation, over gRPC, that only does"
" marshalling and parsing.\n");
printer.Print(vars, "@interface $service_class$ :"
" ProtoService<$service_class$>\n");
printer.Print("- (instancetype)initWithHost:(NSString *)host"
" NS_DESIGNATED_INITIALIZER;\n");
printer.Print("@end\n");
}
return output;
}
string GetSource(const ServiceDescriptor *service) {
string output;
{
// Scope the output stream so it closes and finalizes output to the string.
grpc::protobuf::io::StringOutputStream output_stream(&output);
Printer printer(&output_stream, '$');
map<string, string> vars = {{"service_name", service->name()},
{"service_class", ServiceClassName(service)},
{"package", service->file()->package()}};
printer.Print(vars,
"static NSString *const kPackageName = @\"$package$\";\n");
printer.Print(vars,
"static NSString *const kServiceName = @\"$service_name$\";\n\n");
printer.Print(vars, "@implementation $service_class$\n\n");
printer.Print("// Designated initializer\n");
printer.Print("- (instancetype)initWithHost:(NSString *)host {\n");
printer.Print(" return (self = [super initWithHost:host"
" packageName:kPackageName serviceName:kServiceName]);\n");
printer.Print("}\n\n");
printer.Print("// Override superclass initializer to disallow different"
" package and service names.\n");
printer.Print("- (instancetype)initWithHost:(NSString *)host\n");
printer.Print(" packageName:(NSString *)packageName\n");
printer.Print(" serviceName:(NSString *)serviceName {\n");
printer.Print(" return [self initWithHost:host];\n");
printer.Print("}\n\n\n");
for (int i = 0; i < service->method_count(); i++) {
PrintMethodImplementations(&printer, service->method(i));
}
printer.Print("@end\n");
}
return output;
}
} // namespace grpc_objective_c_generator
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