84 lines
2.2 KiB
C++
84 lines
2.2 KiB
C++
/**
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* src/config/option.h
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*
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* Copyright (c) 2021-2023 Bartek Kryza <bkryza@gmail.com>
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <string>
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#include <utility>
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namespace clanguml {
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namespace config {
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template <typename T> void append_value(T &l, const T &r) { l = r; }
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enum class option_inherit_mode { kOverride, kAppend };
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template <typename T> struct option {
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option(std::string name_,
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option_inherit_mode im = option_inherit_mode::kOverride)
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: name{std::move(name_)}
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, value{}
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, inheritance_mode{im}
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{
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}
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option(std::string name_, T initial_value,
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option_inherit_mode im = option_inherit_mode::kOverride)
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: name{std::move(name_)}
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, value{std::move(initial_value)}
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, has_value{true}
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, inheritance_mode{im}
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{
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}
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void set(const T &v)
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{
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value = v;
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is_declared = true;
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has_value = true;
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}
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void override(const option<T> &o)
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{
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if (o.is_declared && inheritance_mode == option_inherit_mode::kAppend) {
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append_value(value, o.value);
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is_declared = true;
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has_value = true;
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}
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else if (!is_declared && o.is_declared) {
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value = o.value;
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is_declared = true;
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has_value = true;
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}
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}
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void operator()(const T &v) { set(v); }
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T &operator()() { return value; }
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const T &operator()() const { return value; }
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operator bool() const { return has_value; }
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std::string name;
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T value;
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bool is_declared{false};
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bool has_value{false};
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option_inherit_mode inheritance_mode;
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};
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} // namespace config
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} // namespace clanguml
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