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/*************************************************************************
* Copyright (C) 2010-2011 Tavian Barnes <tavianator@tavianator.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/>. *
*************************************************************************/
/**
* @file
* Doubly-linked lists.
*/
#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;
}
dmnsn_array *
dmnsn_array_from_list(const dmnsn_list *list)
{
dmnsn_array *array = dmnsn_new_array(list->obj_size);
for (dmnsn_list_iterator *i = dmnsn_list_first(list);
i != NULL;
i = dmnsn_list_next(i))
{
dmnsn_array_push(array, i->ptr);
}
return array;
}
void
dmnsn_delete_list(dmnsn_list *list)
{
if (list) {
while (dmnsn_list_first(list)) {
dmnsn_list_remove(list, dmnsn_list_first(list));
}
dmnsn_free(list);
}
}
/** Split the second half of a list into a new list. */
static void
dmnsn_list_split_impl(dmnsn_list *list, dmnsn_list *half)
{
/* 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;
}
dmnsn_list *
dmnsn_list_split(dmnsn_list *list)
{
dmnsn_list *half = dmnsn_new_list(list->obj_size);
dmnsn_list_split_impl(list, half);
return half;
}
void
dmnsn_list_sort(dmnsn_list *list, dmnsn_list_comparator_fn *comparator)
{
if (dmnsn_list_size(list) < 2) {
return;
} else if (dmnsn_list_size(list) <= 16) {
/* Use insertion sort on small lists */
dmnsn_list_iterator *current = dmnsn_list_next(dmnsn_list_first(list));
do {
dmnsn_list_iterator *next = dmnsn_list_next(current);
dmnsn_list_iterator_remove(list, current);
dmnsn_list_iterator *i = next;
do {
dmnsn_list_iterator *prev = i ? dmnsn_list_prev(i)
: dmnsn_list_last(list);
if (!comparator(current, prev))
break;
i = prev;
} while (i != dmnsn_list_first(list));
dmnsn_list_iterator_insert(list, i, current);
current = next;
} while (current);
} else {
/* Recursive merge sort */
dmnsn_list half;
dmnsn_list_split_impl(list, &half);
dmnsn_list_sort(list, comparator);
dmnsn_list_sort(&half, comparator);
dmnsn_list_iterator *i = dmnsn_list_first(list);
dmnsn_list_iterator *j = dmnsn_list_first(&half);
while (i || j) {
if (!i) {
j->prev = dmnsn_list_last(list);
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);
}
}
}
}
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