mirror of
https://github.com/scummvm/scummvm.git
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167 lines
3.2 KiB
C++
167 lines
3.2 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "common/scummsys.h"
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#include "bagel/boflib/llist.h"
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namespace Bagel {
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CLList::CLList() {
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_pPrev = nullptr;
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_pNext = nullptr;
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_pData = nullptr;
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}
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CLList::CLList(void *pObj) {
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_pPrev = nullptr;
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_pNext = nullptr;
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_pData = pObj;
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}
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CLList::~CLList() {
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this->Delete();
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}
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void CLList::addToHead(CLList *pNewList) {
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// Can't insert a nullptr record into the list
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assert(pNewList != nullptr);
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CLList *pListHead = getHead();
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pNewList->_pNext = pListHead;
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pNewList->_pPrev = nullptr;
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pListHead->_pPrev = pNewList;
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}
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void CLList::addToTail(CLList *pNewList) {
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// Can't insert a nullptr record into the list
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assert(pNewList != nullptr);
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CLList *pListTail = getTail();
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pNewList->_pPrev = pListTail;
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pNewList->_pNext = nullptr;
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pListTail->_pNext = pNewList;
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}
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void CLList::Insert(CLList *pList) {
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// Can't insert a nullptr record into the list
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assert(pList != nullptr);
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pList->_pPrev = this;
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pList->_pNext = _pNext;
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if (_pNext != nullptr)
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_pNext->_pPrev = pList;
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_pNext = pList;
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}
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void CLList::Delete() {
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if (_pPrev != nullptr)
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_pPrev->_pNext = _pNext;
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if (_pNext != nullptr)
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_pNext->_pPrev = _pPrev;
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_pPrev = _pNext = nullptr;
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}
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void CLList::MoveToHead() {
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CLList *pHead = getHead();
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assert(pHead != nullptr);
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if (this != pHead) {
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Delete();
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pHead->addToHead(this);
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}
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}
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void CLList::MoveToTail() {
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CLList *pTail = getTail();
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assert(pTail != nullptr);
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if (this != pTail) {
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Delete();
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pTail->addToTail(this);
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}
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}
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void CLList::MoveLeft() {
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if (_pPrev != nullptr) {
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CLList *pPrev = _pPrev->getPrev();
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if (pPrev != nullptr) {
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Delete();
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pPrev->Insert(this);
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} else {
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MoveToHead();
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}
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}
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}
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void CLList::MoveRight() {
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CLList *pNext = _pNext;
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if (pNext != nullptr) {
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this->Delete();
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pNext->Insert(this);
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}
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}
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void CLList::FlushList() {
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CLList *pList = getHead();
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// Something is wrong if the head is invalid
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assert(pList != nullptr);
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while (pList != nullptr) {
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CLList *pTmpList = pList->_pNext;
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// Don't delete myself
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if (pList != this)
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delete pList;
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pList = pTmpList;
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}
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}
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CLList *CLList::getHead() {
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CLList *pList = this;
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while (pList->_pPrev != nullptr)
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pList = pList->_pPrev;
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return pList;
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}
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CLList *CLList::getTail() {
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CLList *pList = this;
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while (pList->_pNext != nullptr)
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pList = pList->_pNext;
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return pList;
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}
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} // namespace Bagel
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