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/*
flext - C++ layer for Max/MSP and pd (pure data) externals
Copyright (c) 2001-2003 Thomas Grill (xovo@gmx.net)
For information on usage and redistribution, and for a DISCLAIMER OF ALL
WARRANTIES, see the file, "license.txt," in this distribution.
*/
/*! \file flbind.cpp
\brief Functionality for symbol-bound methods.
*/
#include "flext.h"
#include "flinternal.h"
t_class *flext_base::pxbnd_class = NULL;
#if FLEXT_SYS == FLEXT_SYS_MAX
t_object *px_freelist = NULL;
t_messlist px_messlist[3];
#endif
/*! \brief Set up the proxy class for symbol-bound methods
*/
void flext_base::SetupBindProxy()
{
// already initialized?
if(!pxbnd_class) {
#if FLEXT_SYS == FLEXT_SYS_PD
pxbnd_class = class_new(gensym("flext_base bind proxy"),NULL,NULL,sizeof(pxbnd_object),CLASS_PD|CLASS_NOINLET, A_NULL);
add_anything(pxbnd_class,pxbnd_object::px_method); // for symbol-bound methods
#elif FLEXT_SYS == FLEXT_SYS_MAX
pxbnd_class = new t_class;
pxbnd_class->c_sym = gensym("");
pxbnd_class->c_freelist = &px_freelist;
pxbnd_class->c_freefun = NULL;
pxbnd_class->c_size = sizeof(pxbnd_object);
pxbnd_class->c_tiny = 0;
pxbnd_class->c_noinlet = 1;
px_messlist[0].m_sym = (t_symbol *)pxbnd_class;
px_messlist[1].m_sym = gensym("anything");
px_messlist[1].m_fun = (method)pxbnd_object::px_method;
px_messlist[1].m_type[0] = A_GIMME;
px_messlist[1].m_type[1] = 0;
px_messlist[2].m_sym = 0;
#else
#pragma warning("Not implemented!")
#endif
}
}
flext_base::BindItem::BindItem(int in,const t_symbol *sym,bool (*f)(flext_base *,t_symbol *s,int,t_atom *,void *data),pxbnd_object *p):
Item(sym,0,NULL),fun(f),px(p)
{}
flext_base::BindItem::~BindItem()
{
if(px) {
#if FLEXT_SYS == FLEXT_SYS_PD
pd_unbind(&px->obj.ob_pd,const_cast<t_symbol *>(tag));
#elif FLEXT_SYS == FLEXT_SYS_MAX
if(tag->s_thing == (t_object *)px)
const_cast<t_symbol *>(tag)->s_thing = NULL;
else
error("flext - Binding to symbol %s not found",tag->s_name);
#else
# pragma warning("Not implemented")
#endif
object_free(&px->obj);
}
}
#if FLEXT_SYS == FLEXT_SYS_PD
//! Bind object to a symbol
bool flext_base::Bind(const t_symbol *sym) { pd_bind(&thisHdr()->ob_pd,const_cast<t_symbol *>(sym)); return true; }
//! Unbind object from a symbol
bool flext_base::Unbind(const t_symbol *sym) { pd_unbind(&thisHdr()->ob_pd,const_cast<t_symbol *>(sym)); return true; }
#elif FLEXT_SYS == FLEXT_SYS_MAX
//! Bind object to a symbol
bool flext_base::Bind(const t_symbol *sym) { if(sym->s_thing) return false; else { const_cast<t_symbol *>(sym)->s_thing = (t_object *)thisHdr(); return true; } }
//! Unbind object from a symbol
bool flext_base::Unbind(const t_symbol *sym) { if(sym->s_thing != (t_object *)thisHdr()) return false; else { const_cast<t_symbol *>(sym)->s_thing = NULL; return true; } }
#endif
bool flext_base::BindMethod(const t_symbol *sym,bool (*fun)(flext_base *,t_symbol *s,int argc,t_atom *argv,void *data),void *data)
{
if(!bindhead)
bindhead = new ItemCont;
else {
// Search for symbol
flext_base::BindItem *item = (flext_base::BindItem *)bindhead->Find(sym,0);
// go through all items with matching tag
for(; item && item->tag == sym; item = (flext_base::BindItem *)item->nxt)
if(item->fun == fun) {
// function already registered -> bail out!
post("%s - Symbol already bound with this method",thisName());
return false;
}
if(bindhead->Count() > 20) {
// Hash it!
bindhead->Finalize();
}
}
SetupBindProxy();
#if FLEXT_SYS == FLEXT_SYS_PD
pxbnd_object *px = (pxbnd_object *)object_new(pxbnd_class);
#elif FLEXT_SYS == FLEXT_SYS_MAX
pxbnd_object *px = (pxbnd_object *)newobject(px_messlist);
#else
#pragma warning("Not implemented!")
#endif
if(px) {
BindItem *mi = new BindItem(0,sym,fun,px);
bindhead->Add(mi);
px->init(this,mi,data);
#if FLEXT_SYS == FLEXT_SYS_PD
pd_bind(&px->obj.ob_pd,const_cast<t_symbol *>(sym));
#elif FLEXT_SYS == FLEXT_SYS_MAX
if(!sym->s_thing)
const_cast<t_symbol *>(sym)->s_thing = (t_object *)px;
else
error("%s - Symbol is already bound",thisName());
#else
# pragma warning("Not implemented")
#endif
}
else
error("%s - Symbol proxy could not be created",thisName());
return true;
}
bool flext_base::UnbindMethod(const t_symbol *sym,bool (*fun)(flext_base *,t_symbol *s,int argc,t_atom *argv,void *data),void **data)
{
bool ok = false;
if(bindhead) {
BindItem *it = NULL;
if(sym) {
it = (BindItem *)bindhead->Find(sym,0);
while(it) {
if(it->tag == sym && (!fun || it->fun == fun)) break;
}
}
else {
// any tag
int sz = bindhead->Count();
if(!sz) sz = 1;
for(int i = 0; i < sz; ++i) {
for(it = (BindItem *)bindhead->GetItem(i); it; it = (BindItem *)it->nxt) {
if(!fun || it->fun == fun) break;
}
if(it) break;
}
}
if(it) {
if(data) *data = it->px->data;
ok = bindhead->Remove(it);
if(ok) delete it;
}
}
return ok;
}
bool flext_base::GetBoundMethod(const t_symbol *sym,bool (*fun)(flext_base *,t_symbol *s,int argc,t_atom *argv,void *data),void *&data)
{
if(bindhead) {
// Search for symbol
flext_base::BindItem *item = (flext_base::BindItem *)bindhead->Find(sym,0);
// go through all items with matching tag
for(; item && item->tag == sym; item = (flext_base::BindItem *)item->nxt)
if(item->fun == fun) {
data = item->px->data;
return true;
}
}
return false;
}
bool flext_base::UnbindAll()
{
// bool memleak = false;
int sz = bindhead->Count();
if(!sz) sz = 1;
for(int i = 0; i < sz; ++i) {
for(BindItem *it = (BindItem *)bindhead->GetItem(i); it; it = (BindItem *)it->nxt) {
// if(it->px->data) memleak = true;
if(bindhead->Remove(it)) delete it;
}
}
/*
if(memleak)
post("%s - Memory was not deallocated while unbinding methods",thisName());
*/
return true;
}
void flext_base::pxbnd_object::px_method(pxbnd_object *c,const t_symbol *s,int argc,t_atom *argv)
{
c->item->fun(c->base,(t_symbol *)s,argc,(t_atom *)argv,c->data);
}
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