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/*
* Copyright (c) 2017 Elise Lennion <elise.lennion@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <stdint.h>
#include <expression.h>
#include <gmputil.h>
#include <list.h>
static int expr_msort_cmp(const struct expr *e1, const struct expr *e2);
static int concat_expr_msort_cmp(const struct expr *e1, const struct expr *e2)
{
struct list_head *l = (&e2->expressions)->next;
const struct expr *i1, *i2;
int ret;
list_for_each_entry(i1, &e1->expressions, list) {
i2 = list_entry(l, typeof(struct expr), list);
ret = expr_msort_cmp(i1, i2);
if (ret)
return ret;
l = l->next;
}
return false;
}
static int expr_msort_cmp(const struct expr *e1, const struct expr *e2)
{
switch (e1->ops->type) {
case EXPR_SET_ELEM:
return expr_msort_cmp(e1->key, e2->key);
case EXPR_VALUE:
return mpz_cmp(e1->value, e2->value);
case EXPR_CONCAT:
return concat_expr_msort_cmp(e1, e2);
case EXPR_MAPPING:
return expr_msort_cmp(e1->left, e2->left);
default:
BUG("Unknown expression %s\n", e1->ops->name);
}
}
static void list_splice_sorted(struct list_head *list, struct list_head *head)
{
struct list_head *h = head->next;
struct list_head *l = list->next;
while (l != list) {
if (h == head ||
expr_msort_cmp(list_entry(l, typeof(struct expr), list),
list_entry(h, typeof(struct expr), list)) < 0) {
l = l->next;
list_add_tail(l->prev, h);
continue;
}
h = h->next;
}
}
static void list_cut_middle(struct list_head *list, struct list_head *head)
{
struct list_head *s = head->next;
struct list_head *e = head->prev;
while (e != s) {
e = e->prev;
if (e != s)
s = s->next;
}
__list_cut_position(list, head, s);
}
void list_expr_sort(struct list_head *head)
{
struct list_head *list;
LIST_HEAD(temp);
list = &temp;
if (list_empty(head) || list_is_singular(head))
return;
list_cut_middle(list, head);
list_expr_sort(head);
list_expr_sort(list);
list_splice_sorted(list, head);
}
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