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engines/titanic/true_talk/tt_node.cpp

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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "common/textconsole.h"
+#include "titanic/true_talk/tt_node.h"
+
+namespace Titanic {
+
+TTnode::TTnode() : _priorP(nullptr), _nextP(nullptr) {
+}
+
+TTnode::~TTnode() {
+	detach();
+}
+
+void TTnode::addToTail(TTnode *newNode) {
+	TTnode *tail = getTail();
+	tail->_nextP = newNode;
+	newNode->_priorP = this;
+}
+
+void TTnode::addToHead(TTnode *newNode) {
+	TTnode *head = getHead();
+	head->_priorP = newNode;
+	newNode->_nextP = head;
+}
+
+void TTnode::detach() {
+	if (_priorP)
+		_priorP->_nextP = _nextP;
+
+	if (_nextP)
+		_nextP->_priorP = _priorP;
+}
+
+void TTnode::deleteSiblings() {
+	// Detach current node from prior one, if there is one
+	if (_priorP)
+		_priorP->_nextP = nullptr;
+
+	// Iterate through the linked chain of nodes, deleting each in turn
+	while (_nextP) {
+		TTnode *next = _nextP;
+		_nextP = next->_nextP;
+		delete next;
+	}
+}
+
+TTnode *TTnode::getHead() {
+	if (_priorP == nullptr)
+		return this;
+
+	TTnode *node = _priorP;
+	while (node->_priorP)
+		node = node->_priorP;
+
+	return node;
+}
+
+TTnode *TTnode::getTail() {
+	if (_nextP == nullptr)
+		return this;
+
+	TTnode *node = _nextP;
+	while (node->_nextP)
+		node = node->_nextP;
+
+	return node;
+}
+
+} // End of namespace Titanic