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// Copyright 2025 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, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef THIRD_PARTY_CEL_PYTHON_PY_CEL_VALUE_H_
#define THIRD_PARTY_CEL_PYTHON_PY_CEL_VALUE_H_
#include <Python.h> // IWYU pragma: keep - Needed for PyObject
#include <memory>
#include <string>
#include <utility>
#include "absl/functional/function_ref.h"
#include "absl/status/statusor.h"
#include "common/value.h"
#include "cel_expr_python/py_cel_type.h"
#include "google/protobuf/arena.h"
#include <pybind11/pybind11.h>
namespace cel_python {
namespace py = ::pybind11;
class PyCelArena;
class PyCelEnvInternal;
class PyMessageFactory;
// Wraps a cel::Value. Converts the cel::Value to a Python object on demand and
// caches the Python object for the lifetime of the CelValue.
// Retains a reference to the arena and message factory to ensure they outlive
// the cel::Value.
class PyCelValue {
public:
static void DefinePythonBindings(pybind11::module& m);
PyCelValue(cel::Value& cel_value, std::shared_ptr<PyCelArena> arena,
std::shared_ptr<PyCelEnvInternal> env);
// Move constructor and assignment.
PyCelValue(PyCelValue&& other) noexcept = default;
PyCelValue& operator=(PyCelValue&& other) noexcept = default;
// Disallow copying.
PyCelValue(const PyCelValue&) = delete;
PyCelValue& operator=(const PyCelValue&) = delete;
virtual ~PyCelValue();
virtual PyCelType Type();
virtual PyObject* Value();
virtual PyObject* PlainValue();
virtual std::string ToString();
static cel::Value ToCelValue(PyObject* object,
std::shared_ptr<PyCelArena> arena,
PyMessageFactory* py_message_factory);
protected:
cel::Value cel_value_;
PyObject* object_;
PyObject* plain_object_;
std::shared_ptr<PyCelArena> arena_;
std::shared_ptr<PyCelEnvInternal> env_;
};
// Variant of PyCelValue that is used to access a specific element of a list.
class PyCelListItemAccessor : public PyCelValue {
public:
PyCelListItemAccessor(cel::Value celValue, int index,
std::shared_ptr<PyCelArena> arena,
std::shared_ptr<PyCelEnvInternal> env)
: PyCelValue(celValue, std::move(arena), std::move(env)), index_(index) {}
// Move constructor.
PyCelListItemAccessor(PyCelListItemAccessor&& other) noexcept = default;
~PyCelListItemAccessor() override = default;
// Extracts the element at the given index from the list and caches the
// result. This is called on demand when the python side accesses the value.
void ResolveElement();
PyCelType Type() override;
PyObject* Value() override;
PyObject* PlainValue() override;
std::string ToString() override;
private:
int index_;
bool resolved_ = false;
cel::Value element_value_;
};
// Variant of PyCelValue that is used to access a specific value from a map.
class PyCelMapItemAccessor : public PyCelValue {
public:
PyCelMapItemAccessor(cel::Value celValue, cel::Value key,
std::shared_ptr<PyCelArena> arena,
std::shared_ptr<PyCelEnvInternal> env)
: PyCelValue(celValue, std::move(arena), std::move(env)),
key_(std::move(key)) {}
// Move constructor.
PyCelMapItemAccessor(PyCelMapItemAccessor&& other) noexcept = default;
~PyCelMapItemAccessor() override = default;
void ResolveElement();
PyCelType Type() override;
PyObject* Value() override;
PyObject* PlainValue() override;
std::string ToString() override;
private:
cel::Value key_;
cel::Value element_value_;
bool resolved_ = false;
};
PyObject* CelValueToPyObject(const cel::Value& cel_value,
const std::shared_ptr<PyCelEnvInternal>& env,
const std::shared_ptr<PyCelArena>& arena,
bool plain_value);
absl::StatusOr<cel::Value> PyObjectToCelValue(
PyObject* py_object, const PyCelType& expected_type,
absl::FunctionRef<std::string()> context,
const std::shared_ptr<PyCelEnvInternal>& env, google::protobuf::Arena* arena,
bool bypass_type_check = false);
} // namespace cel_python
#endif // THIRD_PARTY_CEL_PYTHON_PY_CEL_VALUE_H_