mirror of
https://github.com/darlinghq/darling-DSTools.git
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136 lines
3.0 KiB
Objective-C
136 lines
3.0 KiB
Objective-C
/*
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* Copyright (c) 2003 Apple Computer, Inc. All rights reserved.
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*
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* @APPLE_LICENSE_HEADER_START@
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*
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* This file contains Original Code and/or Modifications of Original Code
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* as defined in and that are subject to the Apple Public Source License
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* Version 2.0 (the 'License'). You may not use this file except in
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* compliance with the License. Please obtain a copy of the License at
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* http://www.opensource.apple.com/apsl/ and read it before using this
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* file.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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* Please see the License for the specific language governing rights and
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* limitations under the License.
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*
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* @APPLE_LICENSE_HEADER_END@
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*/
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/*!
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* @header DSCLCommandHistory
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*/
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#import "DSCLCommandHistory.h"
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@interface DSCLCommandHistory (DSCLCommandHistoryPrivate)
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- (unsigned int)increment:(unsigned int*)i;
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- (unsigned int)decrement:(unsigned int*)i;
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- (unsigned int)incrementCurrent;
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- (unsigned int)decrementCurrent;
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@end
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@implementation DSCLCommandHistory
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- init
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{
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unsigned int i;
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[super init];
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mCurrentItem = 0;
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mLastItem = 0;
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mIsClean = YES;
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for (i=0; i < HISTORY_CAPACITY; i++)
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mCommandList[i] = nil;
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return self;
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}
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- (void) dealloc
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{
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unsigned int i;
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for (i=0; i < HISTORY_CAPACITY; i++)
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[mCommandList[i] release]; // It's ok to send a superfluous message to a nil pointer
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[super dealloc];
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}
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- (void)addCommand:(NSString*)inCommand
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{
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[mCommandList[mLastItem] release];
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mCommandList[mLastItem] = [inCommand retain];
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[self increment:&mLastItem];
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mCurrentItem = mLastItem;
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}
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- (void)addTemporaryCommand:(NSString*)inCommand
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{
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[mCommandList[mLastItem] release];
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mCommandList[mLastItem] = [inCommand retain];
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}
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- (NSString*)previousCommand
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{
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[self decrementCurrent];
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return mCommandList[mCurrentItem];
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}
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- (NSString*)nextCommand
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{
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[self incrementCurrent];
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return mCommandList[mCurrentItem];
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}
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- (void)resetToLast
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{
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mCurrentItem = mLastItem;
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}
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- (BOOL)isClean
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{
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return mCurrentItem == mLastItem;
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}
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@end
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@implementation DSCLCommandHistory (DSCLCommandHistoryPrivate)
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- (unsigned int)increment:(unsigned int*)i
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{
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unsigned int oldValue = *i;
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if (*i == HISTORY_CAPACITY-1)
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*i = 0;
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else
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(*i)++;
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return oldValue;
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}
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- (unsigned int)decrement:(unsigned int*)i
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{
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unsigned int oldValue = *i;
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if (*i == 0)
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*i = HISTORY_CAPACITY - 1;
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else
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(*i)--;
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return oldValue;
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}
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- (unsigned int)incrementCurrent
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{
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if (mCurrentItem != mLastItem)
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return [self increment:&mCurrentItem];
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else
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return mCurrentItem;
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}
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- (unsigned int)decrementCurrent
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{
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unsigned int oldValue = [self decrement:&mCurrentItem];
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if (mLastItem == mCurrentItem || mCommandList[mCurrentItem] == nil)
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[self increment:&mCurrentItem];
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return oldValue;
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}
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@end |