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#include "m_pd.h"
struct _onlyone;
typedef struct _oo {
struct _onlyone* x;
//t_symbol* name;
struct _oo* next;
struct _oo* previous;
} t_oo;
static t_oo* oos = NULL;
static t_class *onlyone_class;
typedef struct _onlyone {
t_object x_obj;
t_outlet* outlet;
t_outlet* outlet2;
t_symbol* name;
int iamtheone;
t_symbol* s_empty;
//t_sample f_common;
//t_common* pg;
//t_sample f;
} t_onlyone;
static void onlyone_bang( t_onlyone *x) {
if (x->iamtheone) {
outlet_bang(x->outlet);
} else {
outlet_bang(x->outlet2);
}
}
static void onlyone_register(t_onlyone* x) {
t_oo* oo = oos;
int outputme = 1;
t_oo* new_oo = getbytes(sizeof(*new_oo));
new_oo->x = x;
if ( oo != NULL) {
//post("oo is not null");
if (outputme && (oo->x->name == x->name)) outputme = 0;
// Get the last oo
while (oo->next) {
oo = oo->next;
}
}
// Append
new_oo->previous = oo;
new_oo->next = NULL;
if (oo != NULL) {
oo->next = new_oo;
} else {
//post("Adding the first");
oos = new_oo;
}
x->iamtheone = outputme;
}
static void onlyone_unregister(t_onlyone* x) {
t_oo* oo = oos;
t_onlyone* theotherone = NULL;
t_oo* deleteone = NULL;
if ( oo != NULL) {
// Get the mathching oo and the x to output to
while ( oo ) {
if ( oo->x == x ) {
//post("Found oo to delete");
deleteone = oo;
} else if (x->iamtheone && theotherone==NULL && (oo->x->name == x->name) ) {
theotherone = oo->x;
}
if ( deleteone && theotherone) break;
oo = oo->next;
}
// Delete the oo matching the x that called this function
if (deleteone) {
if (deleteone->previous) {
deleteone->previous->next = deleteone->next;
if (deleteone->next) deleteone->next->previous = deleteone->previous;
} else {
oos = deleteone->next;
if ( deleteone->next != NULL) deleteone->next->previous = NULL;
}
freebytes(deleteone,sizeof(*deleteone));
x->iamtheone = 0;
x->name = NULL;
} else {
post("Hum, did not find oo to delete!");
}
// Output the bang to the other one
if (theotherone) {
theotherone->iamtheone = 1;
onlyone_bang(theotherone);
}
} else {
post("Weird, the list is empty...");
}
// if (oos==NULL) post("this is the end");
}
static void onlyone_free( t_onlyone *x) {
if ( x->name) onlyone_unregister(x);
}
static void onlyone_set( t_onlyone *x, t_symbol *s) {
if ( s == x->s_empty) {
if ( x->name) {
onlyone_unregister(x);
//onlyone_bang(x);
}
} else if ( x->name && s != x->name) {
onlyone_unregister(x);
x->name = s;
onlyone_register(x);
//onlyone_bang(x);
} else if ( x->name == NULL) {
x->name = s;
onlyone_register(x);
//onlyone_bang(x);
}
onlyone_bang(x);
}
static void *onlyone_new(t_symbol* s)
{
t_onlyone *x = (t_onlyone *)pd_new(onlyone_class);
x->s_empty = gensym("");
x->iamtheone = 0;
x->name = NULL;
if ( s != x->s_empty) x->name = s;
x->outlet = outlet_new(&x->x_obj, &s_bang);
if ( x->name) onlyone_register(x);
x->outlet2 = outlet_new(&x->x_obj, &s_bang);
return (void *)x;
}
void onlyone_setup(void) {
onlyone_class = class_new(gensym("onlyone"),
(t_newmethod)onlyone_new,
(t_method)onlyone_free, sizeof(t_onlyone),
0, A_DEFSYMBOL, 0);
class_addbang(onlyone_class, onlyone_bang);
class_addmethod(onlyone_class, (t_method)onlyone_set, gensym("set"),A_DEFSYMBOL,0);
}
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