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interface that can be used for all sorting tasks in the library. The actual sort algorithms to use are now plugable. Timsort is the new default sorting algorithm, the existing algorithms, shellsort and quicksort, can still be selected using a configure switch. Also implement the new NSComparator (blocks) based sorting and insertion index searching methods for NSMutableArray and NSArray. git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk@35573 72102866-910b-0410-8b05-ffd578937521
92 lines
2.6 KiB
Objective-C
92 lines
2.6 KiB
Objective-C
/* Implementation of QuickSort for GNUStep
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Copyright (C) 2005-2012 Free Software Foundation, Inc.
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Written by: Saso Kiselkov <diablos@manga.sk>
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Date: 2005
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Modified by: Niels Grewe <niels.grewe@halbordnung.de>
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Date: September 2012
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This file is part of the GNUstep Base Library.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library 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 GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free
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Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02111 USA.
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*/
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#import "Foundation/NSSortDescriptor.h"
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#import "Foundation/NSArray.h"
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#import "Foundation/NSObjCRuntime.h"
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#import "GSSorting.h"
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/// Swaps the two provided objects.
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static inline void
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SwapObjects(id * o1, id * o2)
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{
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id temp;
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temp = *o1;
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*o1 = *o2;
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*o2 = temp;
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}
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/**
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* Sorts the provided object array's sortRange according to sortDescriptor.
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*/
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// Quicksort algorithm copied from Wikipedia :-).
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#ifndef GS_DISABLE_QUICKSORT
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static void
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_GSQuickSort(id *objects,
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NSRange sortRange,
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id comparisonEntity,
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GSComparisonType type,
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void *context)
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{
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if (sortRange.length > 1)
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{
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id pivot = objects[sortRange.location];
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unsigned int left = sortRange.location + 1;
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unsigned int right = NSMaxRange(sortRange);
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while (left < right)
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{
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if (GSCompareUsingDescriptorOrComparator(left, right,
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comparisonEntity, type, context) == NSOrderedDescending)
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{
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SwapObjects(&objects[left], &objects[--right]);
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}
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else
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{
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left++;
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}
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}
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SwapObjects(&objects[--left], &objects[sortRange.location]);
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SortObjectsWithDescriptor(objects, NSMakeRange(sortRange.location, left
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- sortRange.location), sortDescriptor);
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SortObjectsWithDescriptor(objects, NSMakeRange(right,
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NSMaxRange(sortRange) - right), sortDescriptor);
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}
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}
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@interface GSQuickSortPlaceHolder : NSObject
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@end
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@implementation GSQuickSortPlaceHolder
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+ (void)load
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{
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_GSSortUnstable = _GSQuickSort;
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}
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@end
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#endif
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