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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_BASE_FUNCTION_DESCRIPTOR_H_
#define THIRD_PARTY_CEL_CPP_BASE_FUNCTION_DESCRIPTOR_H_
#include <memory>
#include <string>
#include <utility>
#include <vector>
#include "absl/strings/string_view.h"
#include "absl/types/span.h"
#include "base/kind.h"
namespace cel {
// Describes a function.
class FunctionDescriptor final {
public:
FunctionDescriptor(absl::string_view name, bool receiver_style,
std::vector<Kind> types, bool is_strict = true)
: impl_(std::make_shared<Impl>(name, receiver_style, std::move(types),
is_strict)) {}
// Function name.
const std::string& name() const { return impl_->name; }
// Whether function is receiver style i.e. true means arg0.name(args[1:]...).
bool receiver_style() const { return impl_->receiver_style; }
// The argmument types the function accepts.
//
// TODO(issues/5): make this kinds
const std::vector<Kind>& types() const { return impl_->types; }
// if true (strict, default), error or unknown arguments are propagated
// instead of calling the function. if false (non-strict), the function may
// receive error or unknown values as arguments.
bool is_strict() const { return impl_->is_strict; }
// Helper for matching a descriptor. This tests that the shape is the same --
// |other| accepts the same number and types of arguments and is the same call
// style).
bool ShapeMatches(const FunctionDescriptor& other) const {
return ShapeMatches(other.receiver_style(), other.types());
}
bool ShapeMatches(bool receiver_style, absl::Span<const Kind> types) const;
bool operator==(const FunctionDescriptor& other) const;
bool operator<(const FunctionDescriptor& other) const;
private:
struct Impl final {
Impl(absl::string_view name, bool receiver_style, std::vector<Kind> types,
bool is_strict)
: name(name),
types(std::move(types)),
receiver_style(receiver_style),
is_strict(is_strict) {}
std::string name;
std::vector<Kind> types;
bool receiver_style;
bool is_strict;
};
std::shared_ptr<const Impl> impl_;
};
} // namespace cel
#endif // THIRD_PARTY_CEL_CPP_BASE_FUNCTION_DESCRIPTOR_H_