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// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc. All rights reserved.
// https://developers.google.com/protocol-buffers/
//
// 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.
// Author: kenton@google.com (Kenton Varda)
// Based on original Protocol Buffers design by
// Sanjay Ghemawat, Jeff Dean, and others.
#include <set>
#include <map>
#include <google/protobuf/compiler/cpp/cpp_enum.h>
#include <google/protobuf/compiler/cpp/cpp_helpers.h>
#include <google/protobuf/io/printer.h>
#include <google/protobuf/stubs/strutil.h>
namespace google {
namespace protobuf {
namespace compiler {
namespace cpp {
namespace {
// The GOOGLE_ARRAYSIZE constant is the max enum value plus 1. If the max enum value
// is ::google::protobuf::kint32max, GOOGLE_ARRAYSIZE will overflow. In such cases we should omit the
// generation of the GOOGLE_ARRAYSIZE constant.
bool ShouldGenerateArraySize(const EnumDescriptor* descriptor) {
int32 max_value = descriptor->value(0)->number();
for (int i = 0; i < descriptor->value_count(); i++) {
if (descriptor->value(i)->number() > max_value) {
max_value = descriptor->value(i)->number();
}
}
return max_value != ::google::protobuf::kint32max;
}
} // namespace
EnumGenerator::EnumGenerator(const EnumDescriptor* descriptor,
const Options& options)
: descriptor_(descriptor),
classname_(ClassName(descriptor, false)),
options_(options),
generate_array_size_(ShouldGenerateArraySize(descriptor)) {
}
EnumGenerator::~EnumGenerator() {}
void EnumGenerator::GenerateDefinition(io::Printer* printer) {
map<string, string> vars;
vars["classname"] = classname_;
vars["short_name"] = descriptor_->name();
printer->Print(vars, "enum $classname$ {\n");
printer->Indent();
const EnumValueDescriptor* min_value = descriptor_->value(0);
const EnumValueDescriptor* max_value = descriptor_->value(0);
for (int i = 0; i < descriptor_->value_count(); i++) {
vars["name"] = EnumValueName(descriptor_->value(i));
// In C++, an value of -2147483648 gets interpreted as the negative of
// 2147483648, and since 2147483648 can't fit in an integer, this produces a
// compiler warning. This works around that issue.
vars["number"] = Int32ToString(descriptor_->value(i)->number());
vars["prefix"] = (descriptor_->containing_type() == NULL) ?
"" : classname_ + "_";
if (i > 0) printer->Print(",\n");
printer->Print(vars, "$prefix$$name$ = $number$");
if (descriptor_->value(i)->number() < min_value->number()) {
min_value = descriptor_->value(i);
}
if (descriptor_->value(i)->number() > max_value->number()) {
max_value = descriptor_->value(i);
}
}
if (HasPreservingUnknownEnumSemantics(descriptor_->file())) {
// For new enum semantics: generate min and max sentinel values equal to
// INT32_MIN and INT32_MAX
if (descriptor_->value_count() > 0) printer->Print(",\n");
printer->Print(vars,
"$classname$_$prefix$INT_MIN_SENTINEL_DO_NOT_USE_ = ::google::protobuf::kint32min,\n"
"$classname$_$prefix$INT_MAX_SENTINEL_DO_NOT_USE_ = ::google::protobuf::kint32max");
}
printer->Outdent();
printer->Print("\n};\n");
vars["min_name"] = EnumValueName(min_value);
vars["max_name"] = EnumValueName(max_value);
if (options_.dllexport_decl.empty()) {
vars["dllexport"] = "";
} else {
vars["dllexport"] = options_.dllexport_decl + " ";
}
printer->Print(vars,
"$dllexport$bool $classname$_IsValid(int value);\n"
"const $classname$ $prefix$$short_name$_MIN = $prefix$$min_name$;\n"
"const $classname$ $prefix$$short_name$_MAX = $prefix$$max_name$;\n");
if (generate_array_size_) {
printer->Print(vars,
"const int $prefix$$short_name$_ARRAYSIZE = "
"$prefix$$short_name$_MAX + 1;\n\n");
}
if (HasDescriptorMethods(descriptor_->file())) {
printer->Print(vars,
"$dllexport$const ::google::protobuf::EnumDescriptor* $classname$_descriptor();\n");
// The _Name and _Parse methods
printer->Print(vars,
"inline const ::std::string& $classname$_Name($classname$ value) {\n"
" return ::google::protobuf::internal::NameOfEnum(\n"
" $classname$_descriptor(), value);\n"
"}\n");
printer->Print(vars,
"inline bool $classname$_Parse(\n"
" const ::std::string& name, $classname$* value) {\n"
" return ::google::protobuf::internal::ParseNamedEnum<$classname$>(\n"
" $classname$_descriptor(), name, value);\n"
"}\n");
}
}
void EnumGenerator::
GenerateGetEnumDescriptorSpecializations(io::Printer* printer) {
printer->Print(
"template <> struct is_proto_enum< $classname$> : ::google::protobuf::internal::true_type "
"{};\n",
"classname", ClassName(descriptor_, true));
if (HasDescriptorMethods(descriptor_->file())) {
printer->Print(
"template <>\n"
"inline const EnumDescriptor* GetEnumDescriptor< $classname$>() {\n"
" return $classname$_descriptor();\n"
"}\n",
"classname", ClassName(descriptor_, true));
}
}
void EnumGenerator::GenerateSymbolImports(io::Printer* printer) {
map<string, string> vars;
vars["nested_name"] = descriptor_->name();
vars["classname"] = classname_;
printer->Print(vars, "typedef $classname$ $nested_name$;\n");
for (int j = 0; j < descriptor_->value_count(); j++) {
vars["tag"] = EnumValueName(descriptor_->value(j));
printer->Print(vars,
"static const $nested_name$ $tag$ = $classname$_$tag$;\n");
}
printer->Print(vars,
"static inline bool $nested_name$_IsValid(int value) {\n"
" return $classname$_IsValid(value);\n"
"}\n"
"static const $nested_name$ $nested_name$_MIN =\n"
" $classname$_$nested_name$_MIN;\n"
"static const $nested_name$ $nested_name$_MAX =\n"
" $classname$_$nested_name$_MAX;\n");
if (generate_array_size_) {
printer->Print(vars,
"static const int $nested_name$_ARRAYSIZE =\n"
" $classname$_$nested_name$_ARRAYSIZE;\n");
}
if (HasDescriptorMethods(descriptor_->file())) {
printer->Print(vars,
"static inline const ::google::protobuf::EnumDescriptor*\n"
"$nested_name$_descriptor() {\n"
" return $classname$_descriptor();\n"
"}\n");
printer->Print(vars,
"static inline const ::std::string& $nested_name$_Name($nested_name$ value) {\n"
" return $classname$_Name(value);\n"
"}\n");
printer->Print(vars,
"static inline bool $nested_name$_Parse(const ::std::string& name,\n"
" $nested_name$* value) {\n"
" return $classname$_Parse(name, value);\n"
"}\n");
}
}
void EnumGenerator::GenerateDescriptorInitializer(
io::Printer* printer, int index) {
map<string, string> vars;
vars["classname"] = classname_;
vars["index"] = SimpleItoa(index);
if (descriptor_->containing_type() == NULL) {
printer->Print(vars,
"$classname$_descriptor_ = file->enum_type($index$);\n");
} else {
vars["parent"] = ClassName(descriptor_->containing_type(), false);
printer->Print(vars,
"$classname$_descriptor_ = $parent$_descriptor_->enum_type($index$);\n");
}
}
void EnumGenerator::GenerateMethods(io::Printer* printer) {
map<string, string> vars;
vars["classname"] = classname_;
if (HasDescriptorMethods(descriptor_->file())) {
printer->Print(vars,
"const ::google::protobuf::EnumDescriptor* $classname$_descriptor() {\n"
" protobuf_AssignDescriptorsOnce();\n"
" return $classname$_descriptor_;\n"
"}\n");
}
printer->Print(vars,
"bool $classname$_IsValid(int value) {\n"
" switch(value) {\n");
// Multiple values may have the same number. Make sure we only cover
// each number once by first constructing a set containing all valid
// numbers, then printing a case statement for each element.
set<int> numbers;
for (int j = 0; j < descriptor_->value_count(); j++) {
const EnumValueDescriptor* value = descriptor_->value(j);
numbers.insert(value->number());
}
for (set<int>::iterator iter = numbers.begin();
iter != numbers.end(); ++iter) {
printer->Print(
" case $number$:\n",
"number", Int32ToString(*iter));
}
printer->Print(vars,
" return true;\n"
" default:\n"
" return false;\n"
" }\n"
"}\n"
"\n");
if (descriptor_->containing_type() != NULL) {
// We need to "define" the static constants which were declared in the
// header, to give the linker a place to put them. Or at least the C++
// standard says we have to. MSVC actually insists tha we do _not_ define
// them again in the .cc file.
printer->Print("#ifndef _MSC_VER\n");
vars["parent"] = ClassName(descriptor_->containing_type(), false);
vars["nested_name"] = descriptor_->name();
for (int i = 0; i < descriptor_->value_count(); i++) {
vars["value"] = EnumValueName(descriptor_->value(i));
printer->Print(vars,
"const $classname$ $parent$::$value$;\n");
}
printer->Print(vars,
"const $classname$ $parent$::$nested_name$_MIN;\n"
"const $classname$ $parent$::$nested_name$_MAX;\n");
if (generate_array_size_) {
printer->Print(vars,
"const int $parent$::$nested_name$_ARRAYSIZE;\n");
}
printer->Print("#endif // _MSC_VER\n");
}
}
} // namespace cpp
} // namespace compiler
} // namespace protobuf
} // namespace google