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// Protocol Buffers - Google's data interchange format
// Copyright 2023 Google LLC. All rights reserved.
//
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file or at
// https://developers.google.com/open-source/licenses/bsd
#include "google/protobuf/compiler/hpb/gen_enums.h"
#include <algorithm>
#include <deque>
#include <limits>
#include <string>
#include <vector>
#include "google/protobuf/descriptor.pb.h"
#include "absl/strings/str_cat.h"
#include "absl/strings/str_join.h"
#include "absl/strings/string_view.h"
#include "google/protobuf/compiler/hpb/context.h"
#include "google/protobuf/compiler/hpb/gen_utils.h"
#include "google/protobuf/compiler/hpb/names.h"
#include "google/protobuf/descriptor.h"
namespace google::protobuf::hpb_generator {
namespace protobuf = ::proto2;
using Sub = protobuf::io::Printer::Sub;
namespace {
std::string ContainingTypeNames(
const protobuf::EnumDescriptor* enum_descriptor) {
std::deque<absl::string_view> containing_type_names;
auto containing_type = enum_descriptor->containing_type();
while (containing_type != nullptr) {
containing_type_names.push_front(containing_type->name());
containing_type = containing_type->containing_type();
}
return absl::StrJoin(containing_type_names, "_");
}
} // namespace
// Convert enum value to C++ literal.
//
// 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.
std::string EnumInt32ToString(int number) {
if (number == std::numeric_limits<int32_t>::min()) {
// This needs to be special-cased, see explanation here:
// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52661
return absl::StrCat(number + 1, " - 1");
} else {
return absl::StrCat(number);
}
}
std::string EnumTypeName(const protobuf::EnumDescriptor* enum_descriptor) {
const std::string containing_types = ContainingTypeNames(enum_descriptor);
if (containing_types.empty()) {
// enums types with no package name are prefixed with protos_ to prevent
// conflicts with generated C headers.
if (enum_descriptor->file()->package().empty()) {
return absl::StrCat(kNoPackageNamePrefix,
ToCIdent(enum_descriptor->name()));
}
return ToCIdent(enum_descriptor->name());
} else {
// Since the enum is in global name space (no package), it will have the
// same classified name as the C header include, to prevent collision
// rename as above.
if (enum_descriptor->containing_type()->file()->package().empty()) {
return ToCIdent(absl::StrCat(containing_types, "_", kNoPackageNamePrefix,
enum_descriptor->name()));
} else {
return ToCIdent(
absl::StrCat(containing_types, "_", enum_descriptor->name()));
}
}
}
std::string EnumValueSymbolInNameSpace(
const protobuf::EnumDescriptor* desc,
const protobuf::EnumValueDescriptor* value) {
const std::string containing_types = ContainingTypeNames(desc);
if (!containing_types.empty()) {
return ToCIdent(
absl::StrCat(containing_types, "_", desc->name(), "_", value->name()));
} else {
// protos enum values with no package name are prefixed with protos_ to
// prevent conflicts with generated C headers.
if (desc->file()->package().empty()) {
return absl::StrCat(kNoPackageNamePrefix, ToCIdent(value->name()));
}
return ToCIdent(value->name());
}
}
void WriteEnumValues(const protobuf::EnumDescriptor* desc, Context& ctx) {
std::vector<const protobuf::EnumValueDescriptor*> values;
auto value_count = desc->value_count();
values.reserve(value_count);
for (int i = 0; i < value_count; i++) {
values.push_back(desc->value(i));
}
std::stable_sort(values.begin(), values.end(),
[](const protobuf::EnumValueDescriptor* a,
const protobuf::EnumValueDescriptor* b) {
return a->number() < b->number();
});
for (size_t i = 0; i < values.size(); i++) {
auto value = values[i];
ctx.Emit({{"name", EnumValueSymbolInNameSpace(desc, value)},
{"number", EnumInt32ToString(value->number())},
{"sep", i == values.size() - 1 ? "" : ","}},
R"cc(
$name$ = $number$$sep$
)cc");
}
}
void WriteEnumDeclarations(
const std::vector<const protobuf::EnumDescriptor*>& enums, Context& ctx) {
for (auto enumdesc : enums) {
ctx.Emit({{"type", EnumTypeName(enumdesc)},
Sub("enum_vals", [&] { WriteEnumValues(enumdesc, ctx); })
.WithSuffix(",")},
R"cc(
enum $type$ : int {
$enum_vals$,
};
)cc");
}
}
} // namespace protobuf
} // namespace google::hpb_generator
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