1 files changed, 162 insertions, 0 deletions
diff --git a/src/objectlist.h b/src/objectlist.h
new file mode 100644
index 0000000..ebadf4b
--- /dev/null
+++ b/src/objectlist.h
@@ -0,0 +1,162 @@
+/******************************************************
+ *
+ * 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;
+  }
+}