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// license:BSD-3-Clause
// copyright-holders:Vas Crabb
//============================================================
//
// debugcommandhistory.m - MacOS X Cocoa debug window handling
//
//============================================================
//============================================================
// MAMEDebugView class
//============================================================
#import "debugcommandhistory.h"
@implementation MAMEDebugCommandHistory
+ (NSInteger)defaultLength {
return 100;
}
- (id)init {
if (!(self = [super init]))
return nil;
length = [[self class] defaultLength];
position = -1;
current = nil;
history = [[NSMutableArray alloc] initWithCapacity:length];
return self;
}
- (void)dealloc {
if (current != nil)
[current release];
if (history != nil)
[history release];
[super dealloc];
}
- (NSInteger)length {
return length;
}
- (void)setLength:(NSInteger)l {
length = l;
if ([history count] > length)
[history removeObjectsInRange:NSMakeRange(length, [history count] - length)];
}
- (void)add:(NSString *)entry {
if (([history count] == 0) || ![[history objectAtIndex:0] isEqualToString:entry]) {
[history insertObject:entry atIndex:0];
while ([history count] > length)
[history removeLastObject];
}
position = 0;
}
- (NSString *)previous:(NSString *)cur {
if ((position + 1) < [history count]) {
if (position < 0) {
[current autorelease];
current = [cur copy];
}
return [history objectAtIndex:++position];
} else {
return nil;
}
}
- (NSString *)next:(NSString *)cur {
if (position > 0) {
return [history objectAtIndex:--position];
} else if ((position == 0) && (current != nil) && ![current isEqualToString:[history objectAtIndex:0]]) {
position--;
return [[current retain] autorelease];
} else {
return nil;
}
}
- (void)edit {
if (position == 0)
position--;
}
- (void)reset {
position = -1;
if (current != nil) {
[current release];
current = nil;
}
}
- (void)clear {
position = -1;
if (current != nil) {
[current release];
current = nil;
}
[history removeAllObjects];
}
@end
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