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/******************************************************
*
* This file is based on iem_objlist.h by IOhannes m zmölnig
*
* Original copyleft (c):
* IOhannes m zmölnig
*
* 2008:forum::für::umläute:2008
*
* institute of electronic music and acoustics (iem)
*
******************************************************
*
* license: GNU General Public License v.2
*
******************************************************/
/* this file implements some helperr functions for dealing with lists of
* objects (containing other objects)
*
* used for callbacks to enumerated objects without $0 tricks
*/
//#include "m_pd.h"
/*
The basic element is a parent.
Elements can then be added/removed to/from this parent.
*/
/* ------------------------- helper methods for callbacks ---------------------------- */
typedef struct _objectlist_element {
const t_pd* obj;
struct _objectlist_element* next;
} t_objectlist_element;
typedef struct _objectlist_list {
const t_pd* parent;
t_objectlist_element* obj;
struct _objectlist_list *next;
} t_objectlist_list;
static t_objectlist_list* static_list=0;
// Find a list with the specified parent
static t_objectlist_list* getList(const t_pd*parent) {
t_objectlist_list* list = static_list;
if(0==parent || 0==list)
return 0;
for(list=static_list; list; list=list->next) {
if(parent == list->parent) {
return list;
}
}
return 0;
}
static t_objectlist_list* addList(const t_pd* parent)
{
t_objectlist_list* list=getList(parent);
if(!list) {
list=(t_objectlist_list*)getbytes(sizeof(t_objectlist_list));
list->parent=parent;
list->obj=0;
list->next=0;
if(0==static_list) {
/* new list */
static_list=list;
} else {
/* add to the end of existing list */
t_objectlist_list* dummy=static_list;
while(dummy->next)
dummy=dummy->next;
dummy->next = list;
}
}
return list;
}
static t_objectlist_element* getElements (const t_pd*parent) {
t_objectlist_list* list = getList(parent);
if(list)
return list->obj;
return 0;
}
// Add element to a list
static void addElement (const t_pd*parent, const t_pd*obj) {
t_objectlist_list* p=addList(parent);
t_objectlist_element* list=0;
t_objectlist_element* entry=0;
if(!p || !obj)
return;
list=p->obj;
if(list&&obj==list->obj)
return;
while(list && list->next) {
if(obj==list->obj) /* obj already in list */
return;
list=list->next;
}
/* we are at the end of the list that does not contain obj yet, so add it */
entry=(t_objectlist_element*)getbytes(sizeof(t_objectlist_element));
entry->obj=obj;
entry->next=0;
if(list) {
list->next=entry;
} else {
p->obj=entry;
}
}
// Remove element from list
static void removeElement(const t_pd*parent, const t_pd*obj) {
t_objectlist_list* p=getList(parent);
t_objectlist_element* list=0, *last=0, *next=0;
if(!p || !obj)return;
list=p->obj;
if(!list)
return;
while(list && obj!=list->obj) {
last=list;
list=list->next;
}
if(!list) /* couldn't find this object */
return;
next=list->next;
if(last)
last->next=next;
else
p->obj=next;
freebytes((void*)list, sizeof(t_objectlist_element));
list=0;
}
// Remove element from all lists!
static void removeElementFromLists(const t_pd*obj) {
t_objectlist_list* parents=static_list;
while(parents) {
removeElement(parents->parent, obj);
parents=parents->next;
}
}
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