mirror of
https://github.com/SerenityOS/serenity
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239 lines
6.1 KiB
C++
239 lines
6.1 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <AK/Assertions.h>
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#include <AK/StdLibExtras.h>
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#include <AK/Traits.h>
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namespace AK {
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template<typename ListType, typename ElementType>
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class DoublyLinkedListIterator {
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public:
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bool operator!=(const DoublyLinkedListIterator& other) const { return m_node != other.m_node; }
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bool operator==(const DoublyLinkedListIterator& other) const { return m_node == other.m_node; }
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DoublyLinkedListIterator& operator++()
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{
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m_node = m_node->next;
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return *this;
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}
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ElementType& operator*() { return m_node->value; }
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ElementType* operator->() { return &m_node->value; }
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bool is_end() const { return !m_node; }
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static DoublyLinkedListIterator universal_end() { return DoublyLinkedListIterator(nullptr); }
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private:
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friend ListType;
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explicit DoublyLinkedListIterator(typename ListType::Node* node)
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: m_node(node)
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{
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}
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typename ListType::Node* m_node;
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};
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template<typename T>
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class DoublyLinkedList {
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private:
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struct Node {
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explicit Node(const T& v)
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: value(v)
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{
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}
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explicit Node(T&& v)
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: value(move(v))
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{
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}
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T value;
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Node* next { nullptr };
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Node* prev { nullptr };
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};
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public:
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DoublyLinkedList() { }
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~DoublyLinkedList() { clear(); }
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bool is_empty() const { return !head(); }
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void clear()
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{
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for (auto* node = m_head; node;) {
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auto* next = node->next;
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delete node;
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node = next;
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}
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m_head = nullptr;
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m_tail = nullptr;
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}
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T& first()
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{
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ASSERT(head());
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return head()->value;
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}
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const T& first() const
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{
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ASSERT(head());
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return head()->value;
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}
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T& last()
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{
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ASSERT(head());
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return tail()->value;
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}
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const T& last() const
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{
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ASSERT(head());
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return tail()->value;
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}
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void append(T&& value)
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{
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append_node(new Node(move(value)));
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}
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void append(const T& value)
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{
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append_node(new Node(value));
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}
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void prepend(T&& value)
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{
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prepend_node(new Node(move(value)));
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}
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void prepend(const T& value)
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{
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prepend_node(new Node(value));
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}
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bool contains_slow(const T& value) const
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{
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return find_node(value) != nullptr;
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}
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using Iterator = DoublyLinkedListIterator<DoublyLinkedList, T>;
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friend Iterator;
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Iterator begin() { return Iterator(m_head); }
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Iterator end() { return Iterator::universal_end(); }
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using ConstIterator = DoublyLinkedListIterator<const DoublyLinkedList, const T>;
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friend ConstIterator;
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ConstIterator begin() const { return ConstIterator(m_head); }
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ConstIterator end() const { return ConstIterator::universal_end(); }
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ConstIterator find(const T& value) const
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{
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Node* node = find_node(value);
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if (node)
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return ConstIterator(node);
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return end();
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}
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Iterator find(const T& value)
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{
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Node* node = find_node(value);
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if (node)
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return Iterator(node);
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return end();
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}
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void remove(Iterator it)
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{
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ASSERT(it.m_node);
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auto* node = it.m_node;
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if (node->prev) {
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ASSERT(node != m_head);
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node->prev->next = node->next;
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} else {
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ASSERT(node == m_head);
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m_head = node->next;
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}
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if (node->next) {
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ASSERT(node != m_tail);
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node->next->prev = node->prev;
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} else {
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ASSERT(node == m_tail);
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m_tail = node->prev;
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}
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delete node;
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}
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private:
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void append_node(Node* node)
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{
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if (!m_head) {
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ASSERT(!m_tail);
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m_head = node;
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m_tail = node;
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return;
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}
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ASSERT(m_tail);
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ASSERT(!node->next);
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m_tail->next = node;
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node->prev = m_tail;
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m_tail = node;
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}
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void prepend_node(Node* node)
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{
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if (!m_head) {
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ASSERT(!m_tail);
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m_head = node;
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m_tail = node;
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return;
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}
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ASSERT(m_tail);
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ASSERT(!node->prev);
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m_head->prev = node;
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node->next = m_head;
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m_head = node;
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}
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Node* find_node(const T& value) const
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{
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for (auto* node = m_head; node; node = node->next) {
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if (Traits<T>::equals(node->value, value))
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return node;
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}
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return nullptr;
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}
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Node* head() { return m_head; }
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const Node* head() const { return m_head; }
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Node* tail() { return m_tail; }
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const Node* tail() const { return m_tail; }
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Node* m_head { nullptr };
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Node* m_tail { nullptr };
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};
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}
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using AK::DoublyLinkedList;
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