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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.
#ifndef THIRD_PARTY_CEL_CPP_EVAL_EVAL_CEL_EXPRESSION_FLAT_IMPL_H_
#define THIRD_PARTY_CEL_CPP_EVAL_EVAL_CEL_EXPRESSION_FLAT_IMPL_H_
#include <memory>
#include <utility>
#include "absl/base/nullability.h"
#include "absl/status/statusor.h"
#include "eval/eval/direct_expression_step.h"
#include "eval/eval/evaluator_core.h"
#include "eval/public/base_activation.h"
#include "eval/public/cel_expression.h"
#include "eval/public/cel_value.h"
#include "internal/casts.h"
#include "runtime/internal/runtime_env.h"
#include "google/protobuf/arena.h"
#include "google/protobuf/descriptor.h"
#include "google/protobuf/message.h"
namespace google::api::expr::runtime {
// Wrapper for FlatExpressionEvaluationState used to implement CelExpression.
class CelExpressionFlatEvaluationState : public CelEvaluationState {
public:
CelExpressionFlatEvaluationState(
google::protobuf::Arena* arena,
const google::protobuf::DescriptorPool* absl_nonnull descriptor_pool,
google::protobuf::MessageFactory* absl_nonnull message_factory,
const FlatExpression& expr);
google::protobuf::Arena* arena() { return state_.arena(); }
FlatExpressionEvaluatorState& state() { return state_; }
private:
FlatExpressionEvaluatorState state_;
};
// Implementation of the CelExpression that evaluates a flattened representation
// of the AST.
//
// This class adapts FlatExpression to implement the CelExpression interface.
class CelExpressionFlatImpl : public CelExpression {
public:
CelExpressionFlatImpl(
absl_nonnull std::shared_ptr<const cel::runtime_internal::RuntimeEnv> env,
FlatExpression flat_expression)
: env_(std::move(env)), flat_expression_(std::move(flat_expression)) {}
// Move-only
CelExpressionFlatImpl(const CelExpressionFlatImpl&) = delete;
CelExpressionFlatImpl& operator=(const CelExpressionFlatImpl&) = delete;
CelExpressionFlatImpl(CelExpressionFlatImpl&&) = default;
CelExpressionFlatImpl& operator=(CelExpressionFlatImpl&&) = delete;
// Implement CelExpression.
std::unique_ptr<CelEvaluationState> InitializeState(
google::protobuf::Arena* arena) const override;
absl::StatusOr<CelValue> Evaluate(const BaseActivation& activation,
google::protobuf::Arena* arena) const override {
return Evaluate(activation, InitializeState(arena).get());
}
absl::StatusOr<CelValue> Evaluate(const BaseActivation& activation,
CelEvaluationState* state) const override;
absl::StatusOr<CelValue> Trace(
const BaseActivation& activation, google::protobuf::Arena* arena,
CelEvaluationListener callback) const override {
return Trace(activation, InitializeState(arena).get(), callback);
}
absl::StatusOr<CelValue> Trace(const BaseActivation& activation,
CelEvaluationState* state,
CelEvaluationListener callback) const override;
// Exposed for inspection in tests.
const FlatExpression& flat_expression() const { return flat_expression_; }
private:
absl_nonnull std::shared_ptr<const cel::runtime_internal::RuntimeEnv> env_;
FlatExpression flat_expression_;
};
// Implementation of the CelExpression that evaluates a recursive representation
// of the AST.
//
// This class adapts FlatExpression to implement the CelExpression interface.
//
// Assumes that the flat expression is wrapping a simple recursive program.
class CelExpressionRecursiveImpl : public CelExpression {
private:
class EvaluationState : public CelEvaluationState {
public:
explicit EvaluationState(google::protobuf::Arena* arena) : arena_(arena) {}
google::protobuf::Arena* arena() { return arena_; }
private:
google::protobuf::Arena* arena_;
};
public:
static absl::StatusOr<std::unique_ptr<CelExpressionRecursiveImpl>> Create(
absl_nonnull std::shared_ptr<const cel::runtime_internal::RuntimeEnv> env,
FlatExpression flat_expression);
// Move-only
CelExpressionRecursiveImpl(const CelExpressionRecursiveImpl&) = delete;
CelExpressionRecursiveImpl& operator=(const CelExpressionRecursiveImpl&) =
delete;
CelExpressionRecursiveImpl(CelExpressionRecursiveImpl&&) = default;
CelExpressionRecursiveImpl& operator=(CelExpressionRecursiveImpl&&) = delete;
// Implement CelExpression.
std::unique_ptr<CelEvaluationState> InitializeState(
google::protobuf::Arena* arena) const override {
return std::make_unique<EvaluationState>(arena);
}
absl::StatusOr<CelValue> Evaluate(const BaseActivation& activation,
google::protobuf::Arena* arena) const override;
absl::StatusOr<CelValue> Evaluate(const BaseActivation& activation,
CelEvaluationState* state) const override {
auto* state_impl = cel::internal::down_cast<EvaluationState*>(state);
return Evaluate(activation, state_impl->arena());
}
absl::StatusOr<CelValue> Trace(const BaseActivation& activation,
google::protobuf::Arena* arena,
CelEvaluationListener callback) const override;
absl::StatusOr<CelValue> Trace(
const BaseActivation& activation, CelEvaluationState* state,
CelEvaluationListener callback) const override {
auto* state_impl = cel::internal::down_cast<EvaluationState*>(state);
return Trace(activation, state_impl->arena(), callback);
}
// Exposed for inspection in tests.
const FlatExpression& flat_expression() const { return flat_expression_; }
const DirectExpressionStep* root() const { return root_; }
private:
explicit CelExpressionRecursiveImpl(
absl_nonnull std::shared_ptr<const cel::runtime_internal::RuntimeEnv> env,
FlatExpression flat_expression)
: env_(std::move(env)),
flat_expression_(std::move(flat_expression)),
root_(cel::internal::down_cast<const WrappedDirectStep*>(
flat_expression_.path()[0].get())
->wrapped()) {}
absl_nonnull std::shared_ptr<const cel::runtime_internal::RuntimeEnv> env_;
FlatExpression flat_expression_;
const DirectExpressionStep* root_;
};
} // namespace google::api::expr::runtime
#endif // THIRD_PARTY_CEL_CPP_EVAL_EVAL_CEL_EXPRESSION_FLAT_IMPL_H_