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fix cons

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This commit is contained in:
Sami Samhuri 2011-04-21 14:38:00 -07:00
parent 6a8a737f57
commit 34ee57d759
1 changed files with 28 additions and 3 deletions
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31
src/list.c
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@ -45,9 +45,16 @@ LakeList *list_make(void)
LakeList *list_cons(LakeVal *car, LakeVal *cdr)
{
LakeList *list = list_make_with_capacity(2);
list->vals[0] = car;
list->vals[1] = cdr;
LakeList *list;
if (IS(TYPE_LIST, cdr)) {
list = LIST(cdr);
list_unshift(list, car);
}
else {
list = list_make_with_capacity(2);
list->vals[0] = car;
list->vals[1] = cdr;
}
return list;
}
@ -129,6 +136,24 @@ LakeVal *list_shift(LakeList *list)
return head;
}
LakeVal *list_unshift(LakeList *list, LakeVal *val)
{
if (list->n == 0) {
list_append(list, val);
}
else {
if (list->n >= list->cap) {
list_grow(list);
}
size_t i = list->n++;
while (i--) {
list->vals[i] = list->vals[i - 1];
}
list->vals[0] = val;
}
return NULL;
}
LakeVal *list_pop(LakeList *list)
{
LakeVal *tail = NULL;