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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.
#include "base/operators.h"
#include <algorithm>
#include <array>
#include "absl/base/attributes.h"
#include "absl/base/call_once.h"
#include "absl/log/absl_check.h"
#include "absl/strings/string_view.h"
#include "absl/types/optional.h"
#include "base/internal/operators.h"
namespace cel {
namespace {
using base_internal::OperatorData;
struct OperatorDataNameComparer {
using is_transparent = void;
bool operator()(const OperatorData* lhs, const OperatorData* rhs) const {
return lhs->name < rhs->name;
}
bool operator()(const OperatorData* lhs, absl::string_view rhs) const {
return lhs->name < rhs;
}
bool operator()(absl::string_view lhs, const OperatorData* rhs) const {
return lhs < rhs->name;
}
};
struct OperatorDataDisplayNameComparer {
using is_transparent = void;
bool operator()(const OperatorData* lhs, const OperatorData* rhs) const {
return lhs->display_name < rhs->display_name;
}
bool operator()(const OperatorData* lhs, absl::string_view rhs) const {
return lhs->display_name < rhs;
}
bool operator()(absl::string_view lhs, const OperatorData* rhs) const {
return lhs < rhs->display_name;
}
};
#define CEL_OPERATORS_DATA(id, symbol, name, precedence, arity) \
ABSL_CONST_INIT const OperatorData id##_storage = { \
OperatorId::k##id, name, symbol, precedence, arity};
CEL_INTERNAL_OPERATORS_ENUM(CEL_OPERATORS_DATA)
#undef CEL_OPERATORS_DATA
#define CEL_OPERATORS_COUNT(id, symbol, name, precedence, arity) +1
using OperatorsArray =
std::array<const OperatorData*,
0 + CEL_INTERNAL_OPERATORS_ENUM(CEL_OPERATORS_COUNT)>;
using UnaryOperatorsArray =
std::array<const OperatorData*,
0 + CEL_INTERNAL_UNARY_OPERATORS_ENUM(CEL_OPERATORS_COUNT)>;
using BinaryOperatorsArray =
std::array<const OperatorData*,
0 + CEL_INTERNAL_BINARY_OPERATORS_ENUM(CEL_OPERATORS_COUNT)>;
using TernaryOperatorsArray =
std::array<const OperatorData*,
0 + CEL_INTERNAL_TERNARY_OPERATORS_ENUM(CEL_OPERATORS_COUNT)>;
#undef CEL_OPERATORS_COUNT
ABSL_CONST_INIT absl::once_flag operators_once_flag;
#define CEL_OPERATORS_DO(id, symbol, name, precedence, arity) &id##_storage,
OperatorsArray operators_by_name = {
CEL_INTERNAL_OPERATORS_ENUM(CEL_OPERATORS_DO)};
OperatorsArray operators_by_display_name = {
CEL_INTERNAL_OPERATORS_ENUM(CEL_OPERATORS_DO)};
UnaryOperatorsArray unary_operators_by_name = {
CEL_INTERNAL_UNARY_OPERATORS_ENUM(CEL_OPERATORS_DO)};
UnaryOperatorsArray unary_operators_by_display_name = {
CEL_INTERNAL_UNARY_OPERATORS_ENUM(CEL_OPERATORS_DO)};
BinaryOperatorsArray binary_operators_by_name = {
CEL_INTERNAL_BINARY_OPERATORS_ENUM(CEL_OPERATORS_DO)};
BinaryOperatorsArray binary_operators_by_display_name = {
CEL_INTERNAL_BINARY_OPERATORS_ENUM(CEL_OPERATORS_DO)};
TernaryOperatorsArray ternary_operators_by_name = {
CEL_INTERNAL_TERNARY_OPERATORS_ENUM(CEL_OPERATORS_DO)};
TernaryOperatorsArray ternary_operators_by_display_name = {
CEL_INTERNAL_TERNARY_OPERATORS_ENUM(CEL_OPERATORS_DO)};
#undef CEL_OPERATORS_DO
void InitializeOperators() {
std::stable_sort(operators_by_name.begin(), operators_by_name.end(),
OperatorDataNameComparer{});
std::stable_sort(operators_by_display_name.begin(),
operators_by_display_name.end(),
OperatorDataDisplayNameComparer{});
std::stable_sort(unary_operators_by_name.begin(),
unary_operators_by_name.end(), OperatorDataNameComparer{});
std::stable_sort(unary_operators_by_display_name.begin(),
unary_operators_by_display_name.end(),
OperatorDataDisplayNameComparer{});
std::stable_sort(binary_operators_by_name.begin(),
binary_operators_by_name.end(), OperatorDataNameComparer{});
std::stable_sort(binary_operators_by_display_name.begin(),
binary_operators_by_display_name.end(),
OperatorDataDisplayNameComparer{});
std::stable_sort(ternary_operators_by_name.begin(),
ternary_operators_by_name.end(), OperatorDataNameComparer{});
std::stable_sort(ternary_operators_by_display_name.begin(),
ternary_operators_by_display_name.end(),
OperatorDataDisplayNameComparer{});
}
} // namespace
UnaryOperator::UnaryOperator(Operator op) : data_(op.data_) {
ABSL_CHECK(op.arity() == Arity::kUnary); // Crask OK
}
BinaryOperator::BinaryOperator(Operator op) : data_(op.data_) {
ABSL_CHECK(op.arity() == Arity::kBinary); // Crask OK
}
TernaryOperator::TernaryOperator(Operator op) : data_(op.data_) {
ABSL_CHECK(op.arity() == Arity::kTernary); // Crask OK
}
#define CEL_UNARY_OPERATOR(id, symbol, name, precedence, arity) \
UnaryOperator Operator::id() { return UnaryOperator(&id##_storage); }
CEL_INTERNAL_UNARY_OPERATORS_ENUM(CEL_UNARY_OPERATOR)
#undef CEL_UNARY_OPERATOR
#define CEL_BINARY_OPERATOR(id, symbol, name, precedence, arity) \
BinaryOperator Operator::id() { return BinaryOperator(&id##_storage); }
CEL_INTERNAL_BINARY_OPERATORS_ENUM(CEL_BINARY_OPERATOR)
#undef CEL_BINARY_OPERATOR
#define CEL_TERNARY_OPERATOR(id, symbol, name, precedence, arity) \
TernaryOperator Operator::id() { return TernaryOperator(&id##_storage); }
CEL_INTERNAL_TERNARY_OPERATORS_ENUM(CEL_TERNARY_OPERATOR)
#undef CEL_TERNARY_OPERATOR
absl::optional<Operator> Operator::FindByName(absl::string_view input) {
absl::call_once(operators_once_flag, InitializeOperators);
if (input.empty()) {
return absl::nullopt;
}
auto it =
std::lower_bound(operators_by_name.cbegin(), operators_by_name.cend(),
input, OperatorDataNameComparer{});
if (it == operators_by_name.cend() || (*it)->name != input) {
return absl::nullopt;
}
return Operator(*it);
}
absl::optional<Operator> Operator::FindByDisplayName(absl::string_view input) {
absl::call_once(operators_once_flag, InitializeOperators);
if (input.empty()) {
return absl::nullopt;
}
auto it = std::lower_bound(operators_by_display_name.cbegin(),
operators_by_display_name.cend(), input,
OperatorDataDisplayNameComparer{});
if (it == operators_by_name.cend() || (*it)->display_name != input) {
return absl::nullopt;
}
return Operator(*it);
}
absl::optional<UnaryOperator> UnaryOperator::FindByName(
absl::string_view input) {
absl::call_once(operators_once_flag, InitializeOperators);
if (input.empty()) {
return absl::nullopt;
}
auto it = std::lower_bound(unary_operators_by_name.cbegin(),
unary_operators_by_name.cend(), input,
OperatorDataNameComparer{});
if (it == unary_operators_by_name.cend() || (*it)->name != input) {
return absl::nullopt;
}
return UnaryOperator(*it);
}
absl::optional<UnaryOperator> UnaryOperator::FindByDisplayName(
absl::string_view input) {
absl::call_once(operators_once_flag, InitializeOperators);
if (input.empty()) {
return absl::nullopt;
}
auto it = std::lower_bound(unary_operators_by_display_name.cbegin(),
unary_operators_by_display_name.cend(), input,
OperatorDataDisplayNameComparer{});
if (it == unary_operators_by_display_name.cend() ||
(*it)->display_name != input) {
return absl::nullopt;
}
return UnaryOperator(*it);
}
absl::optional<BinaryOperator> BinaryOperator::FindByName(
absl::string_view input) {
absl::call_once(operators_once_flag, InitializeOperators);
if (input.empty()) {
return absl::nullopt;
}
auto it = std::lower_bound(binary_operators_by_name.cbegin(),
binary_operators_by_name.cend(), input,
OperatorDataNameComparer{});
if (it == binary_operators_by_name.cend() || (*it)->name != input) {
return absl::nullopt;
}
return BinaryOperator(*it);
}
absl::optional<BinaryOperator> BinaryOperator::FindByDisplayName(
absl::string_view input) {
absl::call_once(operators_once_flag, InitializeOperators);
if (input.empty()) {
return absl::nullopt;
}
auto it = std::lower_bound(binary_operators_by_display_name.cbegin(),
binary_operators_by_display_name.cend(), input,
OperatorDataDisplayNameComparer{});
if (it == binary_operators_by_display_name.cend() ||
(*it)->display_name != input) {
return absl::nullopt;
}
return BinaryOperator(*it);
}
absl::optional<TernaryOperator> TernaryOperator::FindByName(
absl::string_view input) {
absl::call_once(operators_once_flag, InitializeOperators);
if (input.empty()) {
return absl::nullopt;
}
auto it = std::lower_bound(ternary_operators_by_name.cbegin(),
ternary_operators_by_name.cend(), input,
OperatorDataNameComparer{});
if (it == ternary_operators_by_name.cend() || (*it)->name != input) {
return absl::nullopt;
}
return TernaryOperator(*it);
}
absl::optional<TernaryOperator> TernaryOperator::FindByDisplayName(
absl::string_view input) {
absl::call_once(operators_once_flag, InitializeOperators);
if (input.empty()) {
return absl::nullopt;
}
auto it = std::lower_bound(ternary_operators_by_display_name.cbegin(),
ternary_operators_by_display_name.cend(), input,
OperatorDataDisplayNameComparer{});
if (it == ternary_operators_by_display_name.cend() ||
(*it)->display_name != input) {
return absl::nullopt;
}
return TernaryOperator(*it);
}
} // namespace cel