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From https://developers.google.com/protocol-buffers/docs/proto#optional: If the default value is not specified for an optional element, a type-specific default value is used instead: for strings, the default value is the empty string. For bools, the default value is false. For numeric types, the default value is zero. For enums, the default value is the first value listed in the enum's type definition. This means care must be taken when adding a value to the beginning of an enum value list. Prior to this change, protoc-c set the default enum value to 0, whether or not 0 was the first value listed in the enum's type definition (or if it even was listed at all).
148 lines
5.8 KiB
C++
148 lines
5.8 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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// Copyright (c) 2008-2013, Dave Benson. All rights reserved.
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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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//
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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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//
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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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// Modified to implement C code by Dave Benson.
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#include <protoc-c/c_enum_field.h>
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#include <protoc-c/c_helpers.h>
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#include <google/protobuf/io/printer.h>
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#include <google/protobuf/wire_format.h>
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namespace google {
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namespace protobuf {
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namespace compiler {
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namespace c {
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using internal::WireFormat;
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// TODO(kenton): Factor out a "SetCommonFieldVariables()" to get rid of
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// repeat code between this and the other field types.
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void SetEnumVariables(const FieldDescriptor* descriptor,
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map<string, string>* variables) {
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(*variables)["name"] = FieldName(descriptor);
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(*variables)["type"] = FullNameToC(descriptor->enum_type()->full_name());
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const EnumValueDescriptor* default_value = descriptor->default_value_enum();
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(*variables)["default"] = FullNameToUpper(default_value->type()->full_name())
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+ "__" + default_value->name();
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(*variables)["deprecated"] = FieldDeprecated(descriptor);
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}
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// ===================================================================
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EnumFieldGenerator::
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EnumFieldGenerator(const FieldDescriptor* descriptor)
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: FieldGenerator(descriptor)
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{
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SetEnumVariables(descriptor, &variables_);
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}
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EnumFieldGenerator::~EnumFieldGenerator() {}
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void EnumFieldGenerator::GenerateStructMembers(io::Printer* printer) const
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{
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switch (descriptor_->label()) {
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case FieldDescriptor::LABEL_REQUIRED:
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printer->Print(variables_, "$type$ $name$$deprecated$;\n");
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break;
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case FieldDescriptor::LABEL_OPTIONAL:
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if (descriptor_->containing_oneof() == NULL)
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printer->Print(variables_, "protobuf_c_boolean has_$name$$deprecated$;\n");
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printer->Print(variables_, "$type$ $name$$deprecated$;\n");
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break;
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case FieldDescriptor::LABEL_REPEATED:
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printer->Print(variables_, "size_t n_$name$$deprecated$;\n");
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printer->Print(variables_, "$type$ *$name$$deprecated$;\n");
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break;
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}
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}
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string EnumFieldGenerator::GetDefaultValue(void) const
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{
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return variables_.find("default")->second;
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}
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void EnumFieldGenerator::GenerateStaticInit(io::Printer* printer) const
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{
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switch (descriptor_->label()) {
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case FieldDescriptor::LABEL_REQUIRED:
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printer->Print(variables_, "$default$");
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break;
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case FieldDescriptor::LABEL_OPTIONAL:
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printer->Print(variables_, "0,$default$");
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break;
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case FieldDescriptor::LABEL_REPEATED:
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// no support for default?
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printer->Print("0,NULL");
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break;
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}
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}
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void EnumFieldGenerator::GenerateDescriptorInitializer(io::Printer* printer) const
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{
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string addr = "&" + FullNameToLower(descriptor_->enum_type()->full_name()) + "__descriptor";
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GenerateDescriptorInitializerGeneric(printer, true, "ENUM", addr);
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}
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} // namespace c
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} // namespace compiler
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} // namespace protobuf
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} // namespace google
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