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// Copyright 2024 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 "checker/optional.h"
#include <utility>
#include "absl/base/no_destructor.h"
#include "absl/status/status.h"
#include "base/builtins.h"
#include "checker/internal/builtins_arena.h"
#include "checker/type_checker_builder.h"
#include "common/decl.h"
#include "common/type.h"
#include "internal/status_macros.h"
namespace cel {
namespace {
Type OptionalOfV() {
static const absl::NoDestructor<OptionalType> kInstance(
checker_internal::BuiltinsArena(), TypeParamType("V"));
return *kInstance;
}
Type TypeOfOptionalOfV() {
static const absl::NoDestructor<TypeType> kInstance(
checker_internal::BuiltinsArena(), OptionalOfV());
return *kInstance;
}
Type ListOfV() {
static const absl::NoDestructor<ListType> kInstance(
checker_internal::BuiltinsArena(), TypeParamType("V"));
return *kInstance;
}
Type OptionalListOfV() {
static const absl::NoDestructor<OptionalType> kInstance(
checker_internal::BuiltinsArena(), ListOfV());
return *kInstance;
}
Type MapOfKV() {
static const absl::NoDestructor<MapType> kInstance(
checker_internal::BuiltinsArena(), TypeParamType("K"),
TypeParamType("V"));
return *kInstance;
}
Type OptionalMapOfKV() {
static const absl::NoDestructor<OptionalType> kInstance(
checker_internal::BuiltinsArena(), MapOfKV());
return *kInstance;
}
class OptionalNames {
public:
static constexpr char kOptionalType[] = "optional_type";
static constexpr char kOptionalOf[] = "optional.of";
static constexpr char kOptionalOfNonZeroValue[] = "optional.ofNonZeroValue";
static constexpr char kOptionalNone[] = "optional.none";
static constexpr char kOptionalValue[] = "value";
static constexpr char kOptionalHasValue[] = "hasValue";
static constexpr char kOptionalOr[] = "or";
static constexpr char kOptionalOrValue[] = "orValue";
static constexpr char kOptionalSelect[] = "_?._";
static constexpr char kOptionalIndex[] = "_[?_]";
static constexpr char kOptionalFirst[] = "first";
static constexpr char kOptionalLast[] = "last";
};
class OptionalOverloads {
public:
// Creation
static constexpr char kOptionalOf[] = "optional_of";
static constexpr char kOptionalOfNonZeroValue[] = "optional_ofNonZeroValue";
static constexpr char kOptionalNone[] = "optional_none";
// Basic accessors
static constexpr char kOptionalValue[] = "optional_value";
static constexpr char kOptionalHasValue[] = "optional_hasValue";
// Chaining `or` overloads.
static constexpr char kOptionalOr[] = "optional_or_optional";
static constexpr char kOptionalOrValue[] = "optional_orValue_value";
// Selection
static constexpr char kOptionalSelect[] = "select_optional_field";
// Indexing
static constexpr char kListOptionalIndexInt[] = "list_optindex_optional_int";
static constexpr char kOptionalListOptionalIndexInt[] =
"optional_list_optindex_optional_int";
static constexpr char kMapOptionalIndexValue[] =
"map_optindex_optional_value";
static constexpr char kOptionalMapOptionalIndexValue[] =
"optional_map_optindex_optional_value";
static constexpr char kListFirst[] = "list_first";
static constexpr char kListLast[] = "list_last";
// Syntactic sugar for chained indexing.
static constexpr char kOptionalListIndexInt[] = "optional_list_index_int";
static constexpr char kOptionalMapIndexValue[] = "optional_map_index_value";
};
absl::Status RegisterOptionalDecls(TypeCheckerBuilder& builder, int version) {
CEL_ASSIGN_OR_RETURN(
auto of,
MakeFunctionDecl(OptionalNames::kOptionalOf,
MakeOverloadDecl(OptionalOverloads::kOptionalOf,
OptionalOfV(), TypeParamType("V"))));
CEL_ASSIGN_OR_RETURN(
auto of_non_zero,
MakeFunctionDecl(
OptionalNames::kOptionalOfNonZeroValue,
MakeOverloadDecl(OptionalOverloads::kOptionalOfNonZeroValue,
OptionalOfV(), TypeParamType("V"))));
CEL_ASSIGN_OR_RETURN(
auto none,
MakeFunctionDecl(
OptionalNames::kOptionalNone,
MakeOverloadDecl(OptionalOverloads::kOptionalNone, OptionalOfV())));
CEL_ASSIGN_OR_RETURN(
auto value, MakeFunctionDecl(OptionalNames::kOptionalValue,
MakeMemberOverloadDecl(
OptionalOverloads::kOptionalValue,
TypeParamType("V"), OptionalOfV())));
CEL_ASSIGN_OR_RETURN(
auto has_value, MakeFunctionDecl(OptionalNames::kOptionalHasValue,
MakeMemberOverloadDecl(
OptionalOverloads::kOptionalHasValue,
BoolType(), OptionalOfV())));
CEL_ASSIGN_OR_RETURN(
auto or_,
MakeFunctionDecl(
OptionalNames::kOptionalOr,
MakeMemberOverloadDecl(OptionalOverloads::kOptionalOr, OptionalOfV(),
OptionalOfV(), OptionalOfV())));
CEL_ASSIGN_OR_RETURN(auto or_value,
MakeFunctionDecl(OptionalNames::kOptionalOrValue,
MakeMemberOverloadDecl(
OptionalOverloads::kOptionalOrValue,
TypeParamType("V"), OptionalOfV(),
TypeParamType("V"))));
// This is special cased by the type checker -- just adding a Decl to prevent
// accidental user overloading.
CEL_ASSIGN_OR_RETURN(
auto select,
MakeFunctionDecl(
OptionalNames::kOptionalSelect,
MakeOverloadDecl(OptionalOverloads::kOptionalSelect, OptionalOfV(),
DynType(), StringType())));
CEL_ASSIGN_OR_RETURN(
auto opt_index,
MakeFunctionDecl(
OptionalNames::kOptionalIndex,
MakeOverloadDecl(OptionalOverloads::kOptionalListOptionalIndexInt,
OptionalOfV(), OptionalListOfV(), IntType()),
MakeOverloadDecl(OptionalOverloads::kListOptionalIndexInt,
OptionalOfV(), ListOfV(), IntType()),
MakeOverloadDecl(OptionalOverloads::kMapOptionalIndexValue,
OptionalOfV(), MapOfKV(), TypeParamType("K")),
MakeOverloadDecl(OptionalOverloads::kOptionalMapOptionalIndexValue,
OptionalOfV(), OptionalMapOfKV(),
TypeParamType("K"))));
CEL_ASSIGN_OR_RETURN(
auto first,
MakeFunctionDecl(OptionalNames::kOptionalFirst,
MakeMemberOverloadDecl(OptionalOverloads::kListFirst,
OptionalOfV(), ListOfV())));
CEL_ASSIGN_OR_RETURN(
auto last,
MakeFunctionDecl(OptionalNames::kOptionalLast,
MakeMemberOverloadDecl(OptionalOverloads::kListLast,
OptionalOfV(), ListOfV())));
CEL_ASSIGN_OR_RETURN(
auto index,
MakeFunctionDecl(
cel::builtin::kIndex,
MakeOverloadDecl(OptionalOverloads::kOptionalListIndexInt,
OptionalOfV(), OptionalListOfV(), IntType()),
MakeOverloadDecl(OptionalOverloads::kOptionalMapIndexValue,
OptionalOfV(), OptionalMapOfKV(),
TypeParamType("K"))));
CEL_RETURN_IF_ERROR(builder.AddVariable(
MakeVariableDecl(OptionalNames::kOptionalType, TypeOfOptionalOfV())));
CEL_RETURN_IF_ERROR(builder.AddFunction(std::move(of)));
CEL_RETURN_IF_ERROR(builder.AddFunction(std::move(of_non_zero)));
CEL_RETURN_IF_ERROR(builder.AddFunction(std::move(none)));
CEL_RETURN_IF_ERROR(builder.AddFunction(std::move(value)));
CEL_RETURN_IF_ERROR(builder.AddFunction(std::move(has_value)));
CEL_RETURN_IF_ERROR(builder.AddFunction(std::move(or_)));
CEL_RETURN_IF_ERROR(builder.AddFunction(std::move(or_value)));
CEL_RETURN_IF_ERROR(builder.AddFunction(std::move(opt_index)));
CEL_RETURN_IF_ERROR(builder.AddFunction(std::move(select)));
CEL_RETURN_IF_ERROR(builder.MergeFunction(std::move(index)));
if (version == 0 || version == 1) {
return absl::OkStatus();
}
CEL_RETURN_IF_ERROR(builder.AddFunction(std::move(first)));
CEL_RETURN_IF_ERROR(builder.AddFunction(std::move(last)));
return absl::OkStatus();
}
} // namespace
CheckerLibrary OptionalCheckerLibrary(int version) {
return CheckerLibrary({
"optional",
[version](TypeCheckerBuilder& builder) {
return RegisterOptionalDecls(builder, version);
},
});
}
} // namespace cel
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