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/*
py/pyext - python external object for PD and MaxMSP
Copyright (c)2002-2005 Thomas Grill (gr@grrrr.org)
For information on usage and redistribution, and for a DISCLAIMER OF ALL
WARRANTIES, see the file, "license.txt," in this distribution.
*/
#include "pyext.h"
#include "flinternal.h"
#include <set>
class MethodCompare:
public std::less<PyObject *>
{
public:
bool operator()(PyObject *a,PyObject *b) const
{
if(PyMethod_Check(a))
if(PyMethod_Check(b)) {
// both are methods
PyObject *sa = PyMethod_GET_SELF(a);
PyObject *sb = PyMethod_GET_SELF(b);
if(sa)
if(sb) {
// both have self
if(sa == sb)
return PyMethod_GET_FUNCTION(a) < PyMethod_GET_FUNCTION(b);
else
return sa < sb;
}
else
return false;
else
if(sb)
return true;
else
return PyMethod_GET_FUNCTION(a) < PyMethod_GET_FUNCTION(b);
}
else
return false;
else
if(PyMethod_Check(b))
return true;
else
// both are functions
return a < b;
}
};
typedef std::set<PyObject *,MethodCompare> FuncSet;
struct bounddata
{
PyObject *self;
FuncSet funcs;
};
bool pyext::boundmeth(flext_base *th,t_symbol *sym,int argc,t_atom *argv,void *data)
{
bounddata *obj = (bounddata *)data;
pyext *pyth = static_cast<pyext *>(th);
PyThreadState *state = pyth->PyLock();
PyObject *args = MakePyArgs(sym,argc,argv,-1,obj->self != NULL);
// call all functions bound by this symbol
for(FuncSet::iterator it = obj->funcs.begin(); it != obj->funcs.end(); ++it) {
PyObject *ret = PyObject_CallObject(*it,args);
if(!ret)
PyErr_Print();
else
Py_DECREF(ret);
}
Py_XDECREF(args);
pyth->PyUnlock(state);
return true;
}
PyObject *pyext::pyext_bind(PyObject *,PyObject *args)
{
PyObject *self,*meth,*name;
if(!PyArg_ParseTuple(args, "OOO:pyext_bind", &self,&name,&meth)) // borrowed references
post("py/pyext - Wrong arguments!");
else if(!PyInstance_Check(self) || !(PyMethod_Check(meth) || PyFunction_Check(meth))) {
post("py/pyext - Wrong argument types!");
}
else {
pyext *th = GetThis(self);
FLEXT_ASSERT(th);
const t_symbol *recv = pyObject_AsSymbol(name);
void *data = NULL;
if(recv && th->GetBoundMethod(recv,boundmeth,data)) {
// already bound to that symbol and function
bounddata *bdt = (bounddata *)data;
FLEXT_ASSERT(bdt != NULL && bdt->self == self);
FuncSet::iterator it = bdt->funcs.find(meth);
if(it == bdt->funcs.end()) {
bdt->funcs.insert(meth);
Py_INCREF(meth);
}
}
else {
Py_INCREF(self); // self is borrowed reference
Py_INCREF(meth);
bounddata *data = new bounddata;
data->self = self;
data->funcs.insert(meth);
th->BindMethod(recv,boundmeth,data);
}
}
Py_INCREF(Py_None);
return Py_None;
}
PyObject *pyext::pyext_unbind(PyObject *,PyObject *args)
{
PyObject *self,*meth,*name;
if(!PyArg_ParseTuple(args, "OOO:pyext_bind", &self,&name,&meth)) // borrowed references
post("py/pyext - Wrong arguments!");
else if(!PyInstance_Check(self) || !(PyMethod_Check(meth) || PyFunction_Check(meth))) {
post("py/pyext - Wrong argument types!");
}
else {
pyext *th = GetThis(self);
FLEXT_ASSERT(th);
const t_symbol *recv = pyObject_AsSymbol(name);
void *data = NULL;
if(recv && th->GetBoundMethod(recv,boundmeth,data)) {
bounddata *bdt = (bounddata *)data;
FLEXT_ASSERT(bdt != NULL);
// erase from map
// ATTENTION: meth is different from the element found in the map
// it just points to the same instance method
FuncSet::iterator it = bdt->funcs.find(meth);
if(it != bdt->funcs.end()) {
Py_DECREF(*it);
bdt->funcs.erase(it);
}
else
post("py/pyext - Function to unbind couldn't be found");
if(bdt->funcs.empty()) {
Py_DECREF(bdt->self);
delete bdt;
th->UnbindMethod(recv,boundmeth,NULL);
}
}
}
Py_INCREF(Py_None);
return Py_None;
}
void pyext::ClearBinding()
{
// in case the object couldn't be constructed...
if(!pyobj) return;
pyext *th = GetThis(pyobj);
FLEXT_ASSERT(th);
void *data = NULL;
const t_symbol *sym = NULL;
// unbind all
while(th->UnbindMethod(sym,NULL,&data)) {
bounddata *bdt = (bounddata *)data;
if(bdt) {
for(FuncSet::iterator it = bdt->funcs.begin(); it != bdt->funcs.end(); ++it)
Py_DECREF(*it);
Py_DECREF(bdt->self);
delete bdt;
}
}
}
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