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// Copyright 2022 Huawei Cloud Computing Technology Co., Ltd.
//
// 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
//
// http://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 INCLUDED_SRC_BUILDTOOL_BUILDENGINE_EXPRESSION_TARGET_NODE_HPP
#define INCLUDED_SRC_BUILDTOOL_BUILDENGINE_EXPRESSION_TARGET_NODE_HPP
#include <type_traits>
#include <utility> // std::move
#include <variant>
#include "src/buildtool/build_engine/expression/expression_ptr.hpp"
#include "src/buildtool/build_engine/expression/target_result.hpp"
class TargetNode {
using Value = ExpressionPtr; // store result type
public:
struct Abstract {
std::string node_type; // arbitrary string that maps to rule
ExpressionPtr string_fields; // map to list of strings
ExpressionPtr target_fields; // map to list of targets
[[nodiscard]] auto IsCacheable() const noexcept -> bool;
};
template <class NodeType>
requires(std::is_same_v<NodeType, Value> or
std::is_same_v<NodeType, Abstract>)
explicit TargetNode(NodeType node)
: data_{std::move(node)},
is_cacheable_{std::get<NodeType>(data_).IsCacheable()} {}
[[nodiscard]] auto IsCacheable() const noexcept -> bool {
return is_cacheable_;
}
[[nodiscard]] auto IsValue() const noexcept {
return std::holds_alternative<Value>(data_);
}
[[nodiscard]] auto IsAbstract() const noexcept {
return std::holds_alternative<Abstract>(data_);
}
[[nodiscard]] auto GetValue() const -> Value const& {
return std::get<Value>(data_);
}
[[nodiscard]] auto GetAbstract() const -> Abstract const& {
return std::get<Abstract>(data_);
}
[[nodiscard]] auto operator==(TargetNode const& other) const noexcept
-> bool {
if (data_.index() != other.data_.index()) {
return false;
}
try {
if (IsValue()) {
return GetValue() == other.GetValue();
}
auto const& abs_l = GetAbstract();
auto const& abs_r = other.GetAbstract();
return abs_l.node_type == abs_r.node_type and
abs_l.string_fields == abs_r.string_fields and
abs_l.target_fields == abs_r.string_fields;
} catch (...) {
// should never happen
return false;
}
}
[[nodiscard]] auto ToString() const noexcept -> std::string {
try {
return ToJson().dump();
} catch (...) {
// should never happen
return {};
}
}
[[nodiscard]] auto ToJson() const -> nlohmann::json;
private:
std::variant<Value, Abstract> data_;
bool is_cacheable_;
};
#endif // INCLUDED_SRC_BUILDTOOL_BUILDENGINE_EXPRESSION_TARGET_NODE_HPP
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