1 /** 2 * Copyright (c) 2021-2022 Huawei Device Co., Ltd. 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 16 #ifndef ES2PANDA_COMPILER_TYPESCRIPT_TYPES_NULL_TYPE_H 17 #define ES2PANDA_COMPILER_TYPESCRIPT_TYPES_NULL_TYPE_H 18 19 #include "type.h" 20 21 namespace panda::es2panda::checker { 22 23 class NullType : public Type { 24 public: NullType()25 NullType() : Type(TypeFlag::NULL_TYPE) {} 26 27 void ToString(std::stringstream &ss) const override; 28 void Identical(TypeRelation *relation, Type *other) override; 29 bool AssignmentSource(TypeRelation *relation, Type *target) override; 30 void AssignmentTarget(TypeRelation *relation, Type *source) override; 31 TypeFacts GetTypeFacts() const override; 32 Type *Instantiate(ArenaAllocator *allocator, TypeRelation *relation, GlobalTypesHolder *globalTypes) override; 33 }; 34 35 } // namespace panda::es2panda::checker 36 37 #endif /* TYPESCRIPT_TYPES_NULL_TYPE_H */ 38