153 lines
2.2 KiB
R
153 lines
2.2 KiB
R
#include "List.h"
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struct list_bucket_s {
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struct list_bucket_s *next;
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struct list_bucket_s **prev;
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id obj;
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};
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typedef struct list_bucket_s list_bucket_t;
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@implementation List
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- (id) init
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{
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count = 0;
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head = nil;
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tail = &head;
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return self;
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}
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- (void) dealloc
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{
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local list_bucket_t *e, *t = nil; //FIXME t uninitialized
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for (e = head; e; e = t) {
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t = e.next;
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[e.obj release];
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obj_free (e);
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}
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[super dealloc];
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}
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- (id) getItemAt: (int) index
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{
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local list_bucket_t *e;
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if (index < 0 || index >= count)
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return nil;
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for (e = head; e && index; index--)
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e = e.next;
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return e.obj;
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}
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-(id) head
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{
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if (!head)
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return nil;
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return head.obj;
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}
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-(id) tail
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{
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local list_bucket_t *e = (list_bucket_t *) tail;
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if (!e)
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return nil;
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return e.obj;
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}
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-(void) addItemAtHead: (id) item
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{
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local list_bucket_t *e = obj_malloc (@sizeof (list_bucket_t));
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e.obj = item;
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e.next = head;
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e.prev = &head;
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if (head)
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head.prev = &e.next;
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head = e;
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count++;
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}
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-(void) addItemAtTail: (id) item
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{
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local list_bucket_t *e = obj_malloc (@sizeof (list_bucket_t));
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e.obj = item;
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e.next = nil;
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e.prev = tail;
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tail[0] = e;
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tail = &e.next;
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count++;
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}
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- (id) removeItem: (id) item
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{
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local list_bucket_t *e;
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for (e = head; e; e = e.next) {
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if (e.obj == item) {
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e.prev[0] = e.next;
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if (e.next)
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e.next.prev = e.prev;
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obj_free (e);
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count--;
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return item;
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}
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}
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return nil;
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}
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- (id) removeItemAtHead
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{
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local list_bucket_t *e;
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local id obj;
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if (!count)
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return nil;
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e = head;
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obj = e.obj;
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e.prev[0] = e.next;
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if (e.next)
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e.next.prev = e.prev;
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if (tail == &e.next)
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tail = e.prev;
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obj_free (e);
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count--;
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return obj;
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}
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- (id) removeItemAtTail
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{
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local list_bucket_t *e;
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local id obj;
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if (!count)
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return nil;
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e = (list_bucket_t *) tail;
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obj = e.obj;
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e.prev[0] = e.next;
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if (e.next)
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e.next.prev = e.prev;
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obj_free (e);
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count--;
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return obj;
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}
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- (int) count
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{
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return count;
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}
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-(void)makeObjectsPerformSelector:(SEL)selector
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{
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local list_bucket_t *e;
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for (e = head; e; e = e.next)
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[e.obj performSelector:selector];
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}
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-(void)makeObjectsPerformSelector:(SEL)selector withObject:(id)arg
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{
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local list_bucket_t *e;
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for (e = head; e; e = e.next)
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[e.obj performSelector:selector withObject:arg];
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}
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@end
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