161 lines
3.8 KiB
C++
161 lines
3.8 KiB
C++
/**
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* @file src/common/model/tvl.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 <optional>
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#include <string>
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/**
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* This namespace implements convenience functions to handle 3-value logic
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* operations needed for applying diagram filters.
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*
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* @see clanguml::common::model::diagram_filter
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* @see clanguml::common::model::filter_visitor
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*/
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namespace clanguml::common::model::tvl {
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/**
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* Alias for 3-value logic values
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*
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* If optional holds nullopt, the value is undefined.
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*/
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using value_t = std::optional<bool>;
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/**
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* Calculate 3-value logic AND value.
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*
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* @param l Left value
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* @param r Right value
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* @return Result of AND operation.
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*/
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inline value_t and_(const value_t &l, const value_t &r)
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{
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if (!l.has_value())
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return r;
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if (!r.has_value())
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return l;
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return r.value() && l.value();
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}
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/**
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* Calculate 3-value logic OR value.
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*
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* @param l Left value
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* @param r Right value
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* @return Result of OR operation.
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*/
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inline value_t or_(const value_t &l, const value_t &r)
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{
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if (!l.has_value() && !r.has_value())
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return {};
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if (l.has_value() && l.value())
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return true;
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if (r.has_value() && r.value())
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return true;
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return false;
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}
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/**
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* Whether the value holds true
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*
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* @param v Logical value
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* @return True, if v holds true
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*/
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inline bool is_true(const value_t &v) { return v.has_value() && v.value(); }
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/**
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* Whether the value holds false
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*
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* @param v Logical value
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* @return True, if v holds false
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*/
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inline bool is_false(const value_t &v) { return v.has_value() && !v.value(); }
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/**
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* Whether the value is undefined
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*
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* @param v Logical value
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* @return True, if v has no value
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*/
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inline bool is_undefined(const value_t &v) { return !v.has_value(); }
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/**
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* 3-value logic equivalent of std::all_of
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*
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* @tparam InputIterator Iterator type
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* @tparam Predicate Predicate type
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* @param first First iterator element
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* @param last Last iterator element
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* @param pred Predicate to apply to each element
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* @return True, if all elements are true or undefined
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*/
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template <typename InputIterator, typename Predicate>
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inline value_t all_of(InputIterator first, InputIterator last, Predicate pred)
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{
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value_t res{};
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for (InputIterator it = first; it != last; it++) {
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value_t m = pred(*it);
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if (m.has_value()) {
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if (m.value()) {
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res = true;
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}
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else {
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res = false;
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break;
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}
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}
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}
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return res;
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}
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/**
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* 3-value logic equivalent of std::any_of
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*
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* @tparam InputIterator Iterator type
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* @tparam Predicate Predicate type
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* @param first First iterator element
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* @param last Last iterator element
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* @param pred Predicate to apply to each element
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* @return True, if at least 1 element is true
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*/
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template <typename InputIterator, typename Predicate>
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inline value_t any_of(InputIterator first, InputIterator last, Predicate pred)
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{
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value_t res{};
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for (InputIterator it = first; it != last; it++) {
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value_t m = pred(*it);
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if (m.has_value()) {
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if (m.value()) {
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res = true;
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return res;
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}
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res = false;
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}
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}
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return res;
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}
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} // namespace clanguml::common::model::tvl
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