211 lines
8.3 KiB
C++
211 lines
8.3 KiB
C++
// Protocol Buffers - Google's data interchange format
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// Copyright 2008 Google Inc. All rights reserved.
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// http://code.google.com/p/protobuf/
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// Author: kenton@google.com (Kenton Varda)
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// Based on original Protocol Buffers design by
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// Sanjay Ghemawat, Jeff Dean, and others.
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#include <google/protobuf/compiler/cpp/cpp_extension.h>
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#include <map>
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#include <google/protobuf/compiler/cpp/cpp_helpers.h>
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#include <google/protobuf/stubs/strutil.h>
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#include <google/protobuf/io/printer.h>
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#include <google/protobuf/descriptor.pb.h>
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namespace google {
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namespace protobuf {
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namespace compiler {
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namespace cpp {
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namespace {
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// Returns the fully-qualified class name of the message that this field
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// extends. This function is used in the Google-internal code to handle some
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// legacy cases.
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string ExtendeeClassName(const FieldDescriptor* descriptor) {
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const Descriptor* extendee = descriptor->containing_type();
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return ClassName(extendee, true);
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}
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} // anonymous namespace
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ExtensionGenerator::ExtensionGenerator(const FieldDescriptor* descriptor,
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const string& dllexport_decl)
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: descriptor_(descriptor),
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dllexport_decl_(dllexport_decl) {
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// Construct type_traits_.
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if (descriptor_->is_repeated()) {
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type_traits_ = "Repeated";
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}
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switch (descriptor_->cpp_type()) {
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case FieldDescriptor::CPPTYPE_ENUM:
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type_traits_.append("EnumTypeTraits< ");
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type_traits_.append(ClassName(descriptor_->enum_type(), true));
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type_traits_.append(", ");
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type_traits_.append(ClassName(descriptor_->enum_type(), true));
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type_traits_.append("_IsValid>");
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break;
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case FieldDescriptor::CPPTYPE_STRING:
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type_traits_.append("StringTypeTraits");
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break;
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case FieldDescriptor::CPPTYPE_MESSAGE:
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type_traits_.append("MessageTypeTraits< ");
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type_traits_.append(ClassName(descriptor_->message_type(), true));
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type_traits_.append(" >");
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break;
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default:
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type_traits_.append("PrimitiveTypeTraits< ");
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type_traits_.append(PrimitiveTypeName(descriptor_->cpp_type()));
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type_traits_.append(" >");
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break;
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}
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}
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ExtensionGenerator::~ExtensionGenerator() {}
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void ExtensionGenerator::GenerateDeclaration(io::Printer* printer) {
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map<string, string> vars;
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vars["extendee" ] = ExtendeeClassName(descriptor_);
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vars["number" ] = SimpleItoa(descriptor_->number());
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vars["type_traits" ] = type_traits_;
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vars["name" ] = descriptor_->name();
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vars["field_type" ] = SimpleItoa(static_cast<int>(descriptor_->type()));
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vars["packed" ] = descriptor_->options().packed() ? "true" : "false";
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vars["constant_name"] = FieldConstantName(descriptor_);
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// If this is a class member, it needs to be declared "static". Otherwise,
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// it needs to be "extern". In the latter case, it also needs the DLL
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// export/import specifier.
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if (descriptor_->extension_scope() == NULL) {
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vars["qualifier"] = "extern";
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if (!dllexport_decl_.empty()) {
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vars["qualifier"] = dllexport_decl_ + " " + vars["qualifier"];
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}
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} else {
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vars["qualifier"] = "static";
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}
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printer->Print(vars,
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"static const int $constant_name$ = $number$;\n"
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"$qualifier$ ::google::protobuf::internal::ExtensionIdentifier< $extendee$,\n"
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" ::google::protobuf::internal::$type_traits$, $field_type$, $packed$ >\n"
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" $name$;\n"
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);
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}
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void ExtensionGenerator::GenerateDefinition(io::Printer* printer) {
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// If this is a class member, it needs to be declared in its class scope.
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string scope = (descriptor_->extension_scope() == NULL) ? "" :
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ClassName(descriptor_->extension_scope(), false) + "::";
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string name = scope + descriptor_->name();
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map<string, string> vars;
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vars["extendee" ] = ExtendeeClassName(descriptor_);
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vars["type_traits" ] = type_traits_;
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vars["name" ] = name;
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vars["constant_name"] = FieldConstantName(descriptor_);
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vars["default" ] = DefaultValue(descriptor_);
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vars["field_type" ] = SimpleItoa(static_cast<int>(descriptor_->type()));
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vars["packed" ] = descriptor_->options().packed() ? "true" : "false";
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vars["scope" ] = scope;
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if (descriptor_->cpp_type() == FieldDescriptor::CPPTYPE_STRING) {
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// We need to declare a global string which will contain the default value.
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// We cannot declare it at class scope because that would require exposing
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// it in the header which would be annoying for other reasons. So we
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// replace :: with _ in the name and declare it as a global.
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string global_name = StringReplace(name, "::", "_", true);
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vars["global_name"] = global_name;
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printer->Print(vars,
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"const ::std::string $global_name$_default($default$);\n");
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// Update the default to refer to the string global.
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vars["default"] = global_name + "_default";
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}
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// Likewise, class members need to declare the field constant variable.
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if (descriptor_->extension_scope() != NULL) {
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printer->Print(vars,
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"#ifndef _MSC_VER\n"
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"const int $scope$$constant_name$;\n"
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"#endif\n");
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}
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printer->Print(vars,
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"::google::protobuf::internal::ExtensionIdentifier< $extendee$,\n"
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" ::google::protobuf::internal::$type_traits$, $field_type$, $packed$ >\n"
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" $name$($constant_name$, $default$);\n");
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}
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void ExtensionGenerator::GenerateRegistration(io::Printer* printer) {
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map<string, string> vars;
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vars["extendee" ] = ExtendeeClassName(descriptor_);
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vars["number" ] = SimpleItoa(descriptor_->number());
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vars["field_type" ] = SimpleItoa(static_cast<int>(descriptor_->type()));
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vars["is_repeated"] = descriptor_->is_repeated() ? "true" : "false";
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vars["is_packed" ] = (descriptor_->is_repeated() &&
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descriptor_->options().packed())
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? "true" : "false";
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switch (descriptor_->cpp_type()) {
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case FieldDescriptor::CPPTYPE_ENUM:
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printer->Print(vars,
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"::google::protobuf::internal::ExtensionSet::RegisterEnumExtension(\n"
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" &$extendee$::default_instance(),\n"
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" $number$, $field_type$, $is_repeated$, $is_packed$,\n");
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printer->Print(
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" &$type$_IsValid);\n",
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"type", ClassName(descriptor_->enum_type(), true));
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break;
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case FieldDescriptor::CPPTYPE_MESSAGE:
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printer->Print(vars,
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"::google::protobuf::internal::ExtensionSet::RegisterMessageExtension(\n"
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" &$extendee$::default_instance(),\n"
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" $number$, $field_type$, $is_repeated$, $is_packed$,\n");
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printer->Print(
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" &$type$::default_instance());\n",
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"type", ClassName(descriptor_->message_type(), true));
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break;
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default:
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printer->Print(vars,
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"::google::protobuf::internal::ExtensionSet::RegisterExtension(\n"
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" &$extendee$::default_instance(),\n"
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" $number$, $field_type$, $is_repeated$, $is_packed$);\n");
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break;
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}
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}
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} // namespace cpp
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} // namespace compiler
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} // namespace protobuf
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} // namespace google
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