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/* -*-c-*- -------------- mix_predicate_list.c :
* Implementation of the functions declared in mix_predicate_list.h
* ------------------------------------------------------------------
* Last change: Time-stamp: "01/07/18 23:02:26 jao"
* ------------------------------------------------------------------
* Copyright (C) 2001 Free Software Foundation, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
*/
#include "mix_predicate_list.h"
/* the predicate list type */
struct mix_predicate_list_t
{
GSList *predicates;
const mix_vm_t *vm;
const mix_predicate_t *last;
};
/* a list of predicates */
mix_predicate_list_t *
mix_predicate_list_new (const mix_vm_t *vm)
{
mix_predicate_list_t *result;
g_return_val_if_fail (vm != NULL, NULL);
result = g_new (mix_predicate_list_t, 1);
result->predicates = NULL;
result->vm = vm;
result->last = NULL;
return result;
}
void
mix_predicate_list_delete (mix_predicate_list_t *list)
{
g_return_if_fail (list != NULL);
g_slist_free (list->predicates);
g_free (list);
}
/* evaluate the predicate list */
gboolean
mix_predicate_list_eval (mix_predicate_list_t *list)
{
GSList *node;
g_return_val_if_fail (list != NULL, FALSE);
node = list->predicates;
while (node) {
mix_predicate_t *pred = (mix_predicate_t *)(node->data);
if (mix_predicate_eval (pred, list->vm))
{
list->last = pred;
return TRUE;
}
node = node->next;
}
list->last = NULL;
return FALSE;
}
/* add/remove predicates to the list */
void
mix_predicate_list_add (mix_predicate_list_t *list, mix_predicate_t *predicate)
{
g_return_if_fail (list != NULL);
g_return_if_fail (predicate != NULL);
if (!g_slist_find (list->predicates, predicate))
list->predicates = g_slist_append (list->predicates, (gpointer)predicate);
(void)mix_predicate_eval (predicate, list->vm);
}
gboolean
mix_predicate_list_remove (mix_predicate_list_t *list,
mix_predicate_t *predicate)
{
g_return_val_if_fail (list != NULL, FALSE);
g_return_val_if_fail (predicate != NULL, FALSE);
if (g_slist_find (list->predicates, predicate))
{
list->predicates = g_slist_remove (list->predicates, predicate);
return TRUE;
}
else
return FALSE;
}
void
mix_predicate_list_clear (mix_predicate_list_t *list)
{
g_return_if_fail (list != NULL);
g_slist_free (list->predicates);
list->predicates = NULL;
list->last = NULL;
}
const mix_predicate_t *
mix_predicate_list_last_true_eval (const mix_predicate_list_t *list)
{
g_return_val_if_fail (list != NULL, NULL);
return list->last;
}
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