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/*************************************************************************
* Copyright (C) 2010 Tavian Barnes <tavianator@gmail.com> *
* *
* This file is part of The Dimension Library. *
* *
* The Dimension Library is free software; you can redistribute it and/ *
* or modify it under the terms of the GNU Lesser General Public License *
* as published by the Free Software Foundation; either version 3 of the *
* License, or (at your option) any later version. *
* *
* The Dimension Library is distributed in the hope that it will be *
* useful, but WITHOUT ANY WARRANTY; without even the implied warranty *
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
* Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public *
* License along with this program. If not, see *
* <http://www.gnu.org/licenses/>. *
*************************************************************************/
#include "dimension.h"
dmnsn_list *
dmnsn_list_from_array(const dmnsn_array *array)
{
dmnsn_list *list = dmnsn_new_list(array->obj_size);
for (size_t i = 0; i < dmnsn_array_size(array); ++i) {
dmnsn_list_push(list, dmnsn_array_at(array, i));
}
return list;
}
void
dmnsn_delete_list(dmnsn_list *list)
{
if (list) {
while (list->first) {
dmnsn_list_remove(list, list->first);
}
free(list);
}
}
dmnsn_list *
dmnsn_list_split(dmnsn_list *list)
{
dmnsn_list *half = dmnsn_new_list(list->obj_size);
/* Find the halfway point */
size_t i, max = dmnsn_list_size(list)/2;
dmnsn_list_iterator *ii;
for (i = 0, ii = dmnsn_list_last(list);
i < max && ii;
++i, ii = dmnsn_list_prev(ii));
if (ii && ii->next) {
half->first = ii->next;
half->last = list->last;
list->last = ii;
half->first->prev = NULL;
list->last->next = NULL;
}
list->length -= max;
half->length = max;
return half;
}
void
dmnsn_list_sort(dmnsn_list *list, dmnsn_comparator_fn *comparator)
{
/* Recursive merge sort */
if (dmnsn_list_size(list) < 2) {
return;
} else if (dmnsn_list_size(list) == 2) {
if ((*comparator)(list->last, list->first)) {
dmnsn_list_swap(list->first, list->last);
}
} else {
dmnsn_list *half = dmnsn_list_split(list);
dmnsn_list_sort(list, comparator);
dmnsn_list_sort(half, comparator);
dmnsn_list_iterator *i = list->first, *j = half->first;
while (i || j) {
if (!i) {
j->prev = list->last;
list->last->next = j;
list->last = half->last;
list->length += half->length;
half->first = half->last = NULL;
half->length = 0;
break;
} else if (!j) {
break;
} else if ((*comparator)(j, i)) {
dmnsn_list_iterator *temp = dmnsn_list_next(j);
dmnsn_list_iterator_remove(half, j);
dmnsn_list_iterator_insert(list, i, j);
j = temp;
} else {
i = dmnsn_list_next(i);
}
}
dmnsn_delete_list(half);
}
}
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