// $Id: stack.cpp 1282 2006-06-09 09:46:49Z alex $ /* @@tag:xara-cn@@ DO NOT MODIFY THIS LINE ================================XARAHEADERSTART=========================== Xara LX, a vector drawing and manipulation program. Copyright (C) 1993-2006 Xara Group Ltd. Copyright on certain contributions may be held in joint with their respective authors. See AUTHORS file for details. LICENSE TO USE AND MODIFY SOFTWARE ---------------------------------- This file is part of Xara LX. Xara LX is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License version 2 as published by the Free Software Foundation. Xara LX and its component source files are 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. 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Xara Group Ltd, Gaddesden Place, Hemel Hempstead, HP2 6EX, UK. http://www.xara.com/ =================================XARAHEADEREND============================ */ /* //*/ // Implementation of the Stack and MarkedStack classes #include "camtypes.h" #include "stack.h" //#include "errors.h" - in camtypes.h [AUTOMATICALLY REMOVED] //#include "ensure.h" - in camtypes.h [AUTOMATICALLY REMOVED] //#include "listitem.h" - in camtypes.h [AUTOMATICALLY REMOVED] DECLARE_SOURCE("$Revision: 1282 $"); // Declare smart memory handling in Debug builds #define new CAM_DEBUG_NEW /******************************************************************************************** > Stack::Stack() Author: Simon_Maneggio (Xara Group Ltd) Created: 8/2/94 Inputs: - Outputs: - Returns: - Purpose: Stack constructor Errors: - SeeAlso: - ********************************************************************************************/ Stack::Stack() { } /******************************************************************************************** > Stack::~Stack() Author: Simon_Maneggio (Xara Group Ltd) Created: 8/2/94 Inputs: - Outputs: - Returns: - Purpose: Stack destructor. The items on the stack are not deleted Errors: - SeeAlso: - ********************************************************************************************/ Stack::~Stack() { } /******************************************************************************************** > void Stack::Push(ListItem* Item) Author: Simon_Maneggio (Xara Group Ltd) Created: 8/2/94 Inputs: - Outputs: - Returns: - Purpose: Pushes Item onto the stack Errors: - SeeAlso: - ********************************************************************************************/ void Stack::Push(ListItem* Item) { stack.AddTail(Item); // Add the item to the top of the stack } /******************************************************************************************** > ListItem* Stack::Pop(void) Author: Simon_Maneggio (Xara Group Ltd) Created: 8/2/94 Inputs: - Outputs: - Returns: The top item on the stack, or NULL if the stack is empty Purpose: Removes the item from the top of the stack, and returns it Errors: - SeeAlso: - ********************************************************************************************/ ListItem* Stack::Pop(void) { return (stack.RemoveTail()); } /******************************************************************************************** > ListItem* Stack::GetTop(void) Author: Simon_Maneggio (Xara Group Ltd) Created: 14/2/94 Inputs: - Outputs: - Returns: The item at the top of the stack Purpose: Allows you to find out what item is on the top of the stack (the item is not removed). Errors: - SeeAlso: - ********************************************************************************************/ ListItem* Stack::GetTop(void) { return (stack.GetTail()); } /******************************************************************************************** > void Stack::DeleteAll() Author: Simon_Maneggio (Xara Group Ltd) Created: 8/2/94 Inputs: - Outputs: - Returns: - Purpose: Removes and deletes all items on the stack Errors: - SeeAlso: - ********************************************************************************************/ void Stack::DeleteAll() { stack.DeleteAll(); // Call the list's DeleteAll method } /******************************************************************************************** > INT32 Stack::Size() Author: Simon_Maneggio (Xara Group Ltd) Created: 8/2/94 Inputs: - Outputs: - Returns: The number of items on the stack Purpose: For finding the size of the stack Errors: - SeeAlso: - ********************************************************************************************/ INT32 Stack::Size() { return stack.GetCount(); } // ------------------------------------------------------------------------------------------ // MarkedStack methods /******************************************************************************************** > MarkedStack::MarkedStack() Author: Simon_Maneggio (Xara Group Ltd) Created: 8/2/94 Inputs: - Outputs: - Returns: - Purpose: MarkedStack constructor Errors: - SeeAlso: - ********************************************************************************************/ MarkedStack::MarkedStack() { } /******************************************************************************************** > MarkedStack::~MarkedStack() Author: Simon_Maneggio (Xara Group Ltd) Created: 8/2/94 Inputs: - Outputs: - Returns: - Purpose: MarkedStack destructor. The items on the stack are not deleted Errors: - SeeAlso: - ********************************************************************************************/ MarkedStack::~MarkedStack() { } /******************************************************************************************** > MarkedStack::Push(ListItem* Item) Author: Simon_Maneggio (Xara Group Ltd) Created: 8/2/94 Inputs: - Outputs: - Returns: - Purpose: Pushes Item onto the stack Errors: - SeeAlso: - ********************************************************************************************/ void MarkedStack::Push(ListItem* Item) { AddTail(Item); // Add the item to the top of the stack } /******************************************************************************************** > ListItem* MarkedStack::Pop(void) Author: Simon_Maneggio (Xara Group Ltd) Created: 8/2/94 Inputs: - Outputs: - Returns: The top item on the stack, or NULL if the stack is empty Purpose: Removes the item from the top of the stack, and returns it Errors: - SeeAlso: - ********************************************************************************************/ ListItem* MarkedStack::Pop(void) { return (RemoveTail()); } /******************************************************************************************** > BOOL MarkedStack::Mark(void) Author: Simon_Maneggio (Xara Group Ltd) Created: 8/2/94 Inputs: - Outputs: - Returns: TRUE if we could create Mark, FALSE if we are out of memory Purpose: Marks the current Top of the stack so that we can easily return to the same state by calling Release(). Errors: ERRORIF is called if we are out of memory SeeAlso: MarkedStack::Release() ********************************************************************************************/ BOOL MarkedStack::Mark(void) { // Firstly create a mark ListItemPtrItem* pMark = new ListItemPtrItem(); // Return with an error if we could not create the mark if (pMark == NULL) return FALSE; pMark->pListItem = GetTail(); // This will be NULL if the list is empty // Push the mark onto the MarkStack MarkStack.Push(pMark); return TRUE; // Success } /******************************************************************************************** > void MarkedStack::Release(void) Author: Simon_Maneggio (Xara Group Ltd) Created: 8/2/94 Inputs: - Outputs: - Returns: - Purpose: Pops and then deletes items from the stack until we find the first mark. If there are no marks then all items on the stack are removed and deleted Errors: - SeeAlso: MarkedStack::Mark ********************************************************************************************/ void MarkedStack::Release(void) { // Find the mark to stop at ListItemPtrItem* MarkRec = (ListItemPtrItem*)MarkStack.Pop(); ListItem* Mark; if (MarkRec == NULL) // There are no marks to find { Mark = NULL; } else { Mark = MarkRec->pListItem; } ListItem* TopOfStack = GetTail(); ListItem* AsGoodAsDead; while (TopOfStack != Mark) // Loop until we find Mark { ENSURE(TopOfStack != NULL, "A Mark could not be found in the Marked stack"); TopOfStack = GetPrev(TopOfStack); AsGoodAsDead = RemoveTail(); delete AsGoodAsDead; } if (MarkRec != NULL) { delete (MarkRec); // Restored State to that pointed to by Mark, so delete it } } /******************************************************************************************** > void MarkedStack::DeleteAll() Author: Simon_Maneggio (Xara Group Ltd) Created: 8/2/94 Inputs: - Outputs: - Returns: - Purpose: Deletes all marks and elements in the MarkedStack Errors: - SeeAlso: - ********************************************************************************************/ void MarkedStack::DeleteAll() { ListItem* TopOfStack; TopOfStack = GetTail(); while (TopOfStack != NULL) // loop while the stack is not empty { Release(); // Deletes mark and all items before the mark TopOfStack = GetTail(); } // Make sure there are no marks left ENSURE(MarkStack.Pop() == NULL, "All marks have not been deleted from the MarkedStack"); }