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// Copyright 2022 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_RUNTIME_ACTIVATION_INTERFACE_H_
#define THIRD_PARTY_CEL_CPP_RUNTIME_ACTIVATION_INTERFACE_H_
#include <vector>
#include "absl/status/statusor.h"
#include "absl/strings/string_view.h"
#include "absl/types/optional.h"
#include "absl/types/span.h"
#include "base/attribute.h"
#include "base/value.h"
#include "runtime/function_overload_reference.h"
namespace cel {
// Interface for providing runtime with variable lookups.
//
// Clients should prefer to use one of the concrete implementations provided by
// the CEL library rather than implementing this interface directly.
// TODO(issues/5): After finalizing, make this public and add instructions
// for clients to migrate.
class ActivationInterface {
public:
virtual ~ActivationInterface() = default;
// Find value for a string (possibly qualified) variable name.
virtual absl::StatusOr<absl::optional<Handle<Value>>> FindVariable(
ValueFactory& factory, absl::string_view name) const = 0;
// Find a set of context function overloads by name.
virtual std::vector<FunctionOverloadReference> FindFunctionOverloads(
absl::string_view name) const = 0;
// Return a list of unknown attribute patterns.
//
// If an attribute (select path) encountered during evaluation matches any of
// the patterns, the value will be treated as unknown and propagated in an
// unknown set.
//
// The returned span must remain valid for the duration of any evaluation
// using this this activation.
virtual absl::Span<const cel::AttributePattern> GetUnknownAttributes()
const = 0;
// Return a list of missing attribute patterns.
//
// If an attribute (select path) encountered during evaluation matches any of
// the patterns, the value will be treated as missing and propagated as an
// error.
//
// The returned span must remain valid for the duration of any evaluation
// using this activation.
virtual absl::Span<const cel::AttributePattern> GetMissingAttributes()
const = 0;
};
} // namespace cel
#endif // THIRD_PARTY_CEL_CPP_RUNTIME_ACTIVATION_INTERFACE_H_