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// Copyright 2023 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "extensions/protobuf/enum_type.h"
#include <limits>
#include <utility>
#include "absl/base/macros.h"
#include "absl/base/optimization.h"
#include "absl/status/status.h"
#include "absl/strings/str_cat.h"
#include "internal/status_macros.h"
namespace cel::extensions {
class ProtoEnumTypeConstantIterator final : public EnumType::ConstantIterator {
public:
explicit ProtoEnumTypeConstantIterator(
const google::protobuf::EnumDescriptor& descriptor)
: descriptor_(descriptor) {}
bool HasNext() override { return index_ < descriptor_.value_count(); }
absl::StatusOr<Constant> Next() override {
if (ABSL_PREDICT_FALSE(index_ >= descriptor_.value_count())) {
return absl::FailedPreconditionError(
"EnumType::ConstantIterator::Next() called when "
"EnumType::ConstantIterator::HasNext() returns false");
}
const auto* value = descriptor_.value(index_++);
return Constant(ProtoEnumType::MakeConstantId(value->number()),
value->name(), value->number(), value);
}
private:
const google::protobuf::EnumDescriptor& descriptor_;
int index_ = 0;
};
absl::StatusOr<Handle<ProtoEnumType>> ProtoEnumType::Resolve(
TypeManager& type_manager, const google::protobuf::EnumDescriptor& descriptor) {
CEL_ASSIGN_OR_RETURN(auto type,
type_manager.ResolveType(descriptor.full_name()));
if (ABSL_PREDICT_FALSE(!type.has_value())) {
return absl::NotFoundError(
absl::StrCat("Missing protocol buffer enum type implementation for \"",
descriptor.full_name(), "\""));
}
if (ABSL_PREDICT_FALSE(!(*type)->Is<ProtoEnumType>())) {
return absl::FailedPreconditionError(absl::StrCat(
"Unexpected protocol buffer enum type implementation for \"",
descriptor.full_name(), "\": ", (*type)->DebugString()));
}
return std::move(type).value().As<ProtoEnumType>();
}
size_t ProtoEnumType::constant_count() const {
return descriptor().value_count();
}
absl::StatusOr<absl::optional<ProtoEnumType::Constant>>
ProtoEnumType::FindConstantByName(absl::string_view name) const {
const auto* value_desc = descriptor().FindValueByName(name);
if (ABSL_PREDICT_FALSE(value_desc == nullptr)) {
return absl::nullopt;
}
ABSL_ASSERT(value_desc->name() == name);
return Constant(MakeConstantId(value_desc->number()), value_desc->name(),
value_desc->number(), value_desc);
}
absl::StatusOr<absl::optional<ProtoEnumType::Constant>>
ProtoEnumType::FindConstantByNumber(int64_t number) const {
if (ABSL_PREDICT_FALSE(number < std::numeric_limits<int>::min() ||
number > std::numeric_limits<int>::max())) {
// Treat it as not found.
return absl::nullopt;
}
const auto* value_desc =
descriptor().FindValueByNumber(static_cast<int>(number));
if (ABSL_PREDICT_FALSE(value_desc == nullptr)) {
return absl::nullopt;
}
ABSL_ASSERT(value_desc->number() == number);
return Constant(MakeConstantId(value_desc->number()), value_desc->name(),
value_desc->number(), value_desc);
}
absl::StatusOr<UniqueRef<EnumType::ConstantIterator>>
ProtoEnumType::NewConstantIterator(MemoryManager& memory_manager) const {
return MakeUnique<ProtoEnumTypeConstantIterator>(memory_manager,
descriptor());
}
} // namespace cel::extensions