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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 KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "cel_expr_python/py_cel_overload.h"
#include <memory>
#include <optional>
#include <string>
#include <utility>
#include <vector>
#include "common/signature.h"
#include "env/config.h"
#include "env/type_info.h"
#include "cel_expr_python/py_cel_type.h"
#include "cel_expr_python/py_error_status.h"
#include <pybind11/pybind11.h>
#include <pybind11/stl.h>
namespace cel_python {
namespace py = ::pybind11;
void PyCelOverload::DefinePythonBindings(py::module_& m) {
py::class_<PyCelOverload, std::shared_ptr<PyCelOverload>>(m, "Overload")
.def(py::init([](std::optional<std::string> id,
const PyCelType& return_type,
const std::vector<PyCelType>& parameters, bool is_member,
py::object impl, std::optional<std::string> signature) {
if (signature.has_value()) {
if (!parameters.empty()) {
throw py::value_error(
"If 'signature' is specified, 'parameters' "
"should not be specified");
}
cel::ParsedFunctionOverload parsed =
ThrowIfError(cel::ParseFunctionSignature(*signature));
std::string overload_id =
id.has_value() ? std::move(*id) : *signature;
std::vector<PyCelType> parsed_parameters;
if (parsed.signature_type.has_function()) {
const auto& function_type_spec =
parsed.signature_type.function();
parsed_parameters.reserve(
function_type_spec.arg_types().size());
for (const auto& arg : function_type_spec.arg_types()) {
parsed_parameters.push_back(PyCelType::FromTypeInfo(
ThrowIfError(cel::TypeSpecToTypeInfo(arg))));
}
}
return PyCelOverload(std::move(overload_id), return_type,
std::move(parsed_parameters),
parsed.is_member, std::move(impl));
}
if (id.has_value()) {
return PyCelOverload(std::move(*id), return_type, parameters,
is_member, std::move(impl));
}
throw py::value_error(
"Either 'id' or 'signature' must be specified");
}),
py::arg("id") = std::nullopt,
py::arg("return_type") = PyCelType::Dyn(),
py::arg("parameters") = std::vector<PyCelType>{},
py::arg("is_member") = false, py::arg("impl") = py::none(),
py::arg("signature") = std::nullopt);
}
PyCelOverload::PyCelOverload(std::string overload_id,
const PyCelType& return_type,
std::vector<PyCelType> parameters, bool is_member,
py::object py_function)
: overload_id_(std::move(overload_id)),
return_type_(return_type),
parameters_(std::move(parameters)),
is_member_(is_member),
py_function_(std::move(py_function)) {}
cel::Config::FunctionOverloadConfig PyCelOverload::ToFunctionOverloadConfig()
const {
cel::Config::FunctionOverloadConfig overload_config;
overload_config.overload_id = overload_id_;
overload_config.return_type = PyCelType::ToTypeInfo(return_type_);
overload_config.parameters.reserve(parameters_.size());
for (const PyCelType& parameter : parameters_) {
overload_config.parameters.push_back(PyCelType::ToTypeInfo(parameter));
}
overload_config.is_member_function = is_member_;
return overload_config;
}
} // namespace cel_python