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Commit e88bd5f7 authored by Jim Fulton's avatar Jim Fulton
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Changed semantics is acquire method: 

  - Available for Impleicit and Explicit,

  - Does not filter names with leading underscore,

  - Accepts optional 'filter' and 'extra' arguments.  If 'filter'
    is provided, then it must be a callable object and it is
    called with four arguments:

      inst -- The object in which an attribute is found

      name -- The attribute name

      v -- The attribute value

      extra -- The 'extra' value passed to 'acquire' or None.

    The filter function should return 1 if the attribute should
    be returned by acquire and 0 otherwise.  It may also raise an
    error, in which case the error is propigated.
parent fb42f412
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Showing with 250 additions and 106 deletions
lib/Components/ExtensionClass/Acquisition.c
View file @ e88bd5f7
/*
$Id: Acquisition.c,v 1.8 1997/07/02 20:15:27 jim Exp $
$Id: Acquisition.c,v 1.9 1997/10/28 19:36:46 jim Exp $
Acquisition Wrappers -- Implementation of acquisition through wrappers
......@@ -59,6 +59,29 @@
Full description
$Log: Acquisition.c,v $
Revision 1.9 1997/10/28 19:36:46 jim
Changed semantics is acquire method:
- Available for Impleicit and Explicit,
- Does not filter names with leading underscore,
- Accepts optional 'filter' and 'extra' arguments. If 'filter'
is provided, then it must be a callable object and it is
called with four arguments:
inst -- The object in which an attribute is found
name -- The attribute name
v -- The attribute value
extra -- The 'extra' value passed to 'acquire' or None.
The filter function should return 1 if the attribute should
be returned by acquire and 0 otherwise. It may also raise an
error, in which case the error is propigated.
Revision 1.8 1997/07/02 20:15:27 jim
Added stupid parens to make 'gcc -Wall -pedantic' and Barry happy.
......@@ -249,6 +272,9 @@ Wrapper_getattro(Wrapper *self, PyObject *oname)
name=PyString_AsString(oname);
if(*name=='a' && strcmp(name,"acquire")==0)
return Py_FindAttr((PyObject*)self,oname);
if(*name != '_')
{
......@@ -342,13 +368,44 @@ Xaq_getattro(Wrapper *self, PyObject *oname)
return NULL;
}
static int
apply_filter(PyObject *filter, PyObject *inst, PyObject *oname, PyObject *r,
PyObject *extra)
{
PyObject *fr;
int ir;
UNLESS(fr=PyTuple_New(4)) goto err;
PyTuple_SET_ITEM(fr,0,inst);
Py_INCREF(inst);
PyTuple_SET_ITEM(fr,1,oname);
Py_INCREF(oname);
PyTuple_SET_ITEM(fr,2,r);
Py_INCREF(r);
PyTuple_SET_ITEM(fr,3,extra);
Py_INCREF(extra);
UNLESS_ASSIGN(fr,PyObject_CallObject(filter, fr)) goto err;
ir=PyObject_IsTrue(fr);
Py_DECREF(fr);
if(ir) return 1;
Py_DECREF(r);
return 0;
err:
Py_DECREF(r);
return -1;
}
static PyObject *
Wrapper_acquire(Wrapper *self, PyObject *oname)
Wrapper_acquire(Wrapper *self, PyObject *oname,
PyObject *filter, PyObject *extra)
{
PyObject *r;
char *name;
int ir;
if(self->obj && (r=PyObject_GetAttr(self->obj,oname)))
if(self->obj)
{
if(r=PyObject_GetAttr(self->obj,oname))
{
if(r->ob_type==self->ob_type)
{
......@@ -365,15 +422,18 @@ Wrapper_acquire(Wrapper *self, PyObject *oname)
ASSIGN(r,PyECMethod_New(r,(PyObject*)self));
else if(has__of__(r))
ASSIGN(r,CallMethodO(r,py__of__,Build("(O)", self), NULL));
return r;
if(filter)
switch(apply_filter(filter,self->obj,oname,r,extra))
{
case -1: return NULL;
case 1: return r;
}
else return r;
}
PyErr_Clear();
}
if(self->obj) PyErr_Clear();
name=PyString_AsString(oname);
if(*name != '_')
{
if(*name++=='a' && *name++=='q' && *name++=='_')
{
if(strcmp(name,"parent")==0)
......@@ -396,21 +456,23 @@ Wrapper_acquire(Wrapper *self, PyObject *oname)
{
if(isWrapper(self->container))
{
if((r=Wrapper_acquire((Wrapper*)self->container,oname)))
if((r=Wrapper_acquire((Wrapper*)self->container,oname,filter,extra)))
return r;
}
else
{
if((r=PyObject_GetAttr(self->container,oname)))
return r;
if(filter)
switch(apply_filter(filter,self->container,oname,r,extra))
{
case -1: return NULL;
case 1: return r;
}
PyErr_Clear();
else return r;
}
PyErr_Clear();
}
if(*name++=='_' && strcmp(name,"_init__")==0)
return Py_FindAttr((PyObject*)self,oname);
PyErr_SetObject(PyExc_AttributeError,oname);
return NULL;
}
......@@ -601,10 +663,20 @@ static PyMappingMethods Wrapper_as_mapping = {
/* -------------------------------------------------------- */
static PyObject *
Wrapper_acquire_method(Wrapper *self, PyObject *args)
{
PyObject *name, *filter=0, *extra=Py_None;
UNLESS(PyArg_ParseTuple(args,"O|OO",&name,&filter,&extra)) return NULL;
return Wrapper_acquire(self,name,filter,extra);
}
static struct PyMethodDef Wrapper_methods[] = {
{"__init__", (PyCFunction)Wrapper__init__, 0,
"Initialize an Acquirer Wrapper"},
{"acquire", (PyCFunction)Wrapper_acquire, 0,
{"acquire", (PyCFunction)Wrapper_acquire_method, METH_VARARGS,
"Get an attribute, acquiring it if necessary"},
{NULL, NULL} /* sentinel */
};
......@@ -721,7 +793,7 @@ void
initAcquisition()
{
PyObject *m, *d;
char *rev="$Revision: 1.8 $";
char *rev="$Revision: 1.9 $";
PURE_MIXIN_CLASS(Acquirer,
"Base class for objects that implicitly"
" acquire attributes from containers\n"
......@@ -736,7 +808,7 @@ initAcquisition()
/* Create the module and add the functions */
m = Py_InitModule4("Acquisition", methods,
"Provide base classes for acquiring objects\n\n"
"$Id: Acquisition.c,v 1.8 1997/07/02 20:15:27 jim Exp $\n",
"$Id: Acquisition.c,v 1.9 1997/10/28 19:36:46 jim Exp $\n",
(PyObject*)NULL,PYTHON_API_VERSION);
d = PyModule_GetDict(m);
......
lib/Components/ExtensionClass/src/Acquisition.c
View file @ e88bd5f7
/*
$Id: Acquisition.c,v 1.8 1997/07/02 20:15:27 jim Exp $
$Id: Acquisition.c,v 1.9 1997/10/28 19:36:46 jim Exp $
Acquisition Wrappers -- Implementation of acquisition through wrappers
......@@ -59,6 +59,29 @@
Full description
$Log: Acquisition.c,v $
Revision 1.9 1997/10/28 19:36:46 jim
Changed semantics is acquire method:
- Available for Impleicit and Explicit,
- Does not filter names with leading underscore,
- Accepts optional 'filter' and 'extra' arguments. If 'filter'
is provided, then it must be a callable object and it is
called with four arguments:
inst -- The object in which an attribute is found
name -- The attribute name
v -- The attribute value
extra -- The 'extra' value passed to 'acquire' or None.
The filter function should return 1 if the attribute should
be returned by acquire and 0 otherwise. It may also raise an
error, in which case the error is propigated.
Revision 1.8 1997/07/02 20:15:27 jim
Added stupid parens to make 'gcc -Wall -pedantic' and Barry happy.
......@@ -249,6 +272,9 @@ Wrapper_getattro(Wrapper *self, PyObject *oname)
name=PyString_AsString(oname);
if(*name=='a' && strcmp(name,"acquire")==0)
return Py_FindAttr((PyObject*)self,oname);
if(*name != '_')
{
......@@ -342,13 +368,44 @@ Xaq_getattro(Wrapper *self, PyObject *oname)
return NULL;
}
static int
apply_filter(PyObject *filter, PyObject *inst, PyObject *oname, PyObject *r,
PyObject *extra)
{
PyObject *fr;
int ir;
UNLESS(fr=PyTuple_New(4)) goto err;
PyTuple_SET_ITEM(fr,0,inst);
Py_INCREF(inst);
PyTuple_SET_ITEM(fr,1,oname);
Py_INCREF(oname);
PyTuple_SET_ITEM(fr,2,r);
Py_INCREF(r);
PyTuple_SET_ITEM(fr,3,extra);
Py_INCREF(extra);
UNLESS_ASSIGN(fr,PyObject_CallObject(filter, fr)) goto err;
ir=PyObject_IsTrue(fr);
Py_DECREF(fr);
if(ir) return 1;
Py_DECREF(r);
return 0;
err:
Py_DECREF(r);
return -1;
}
static PyObject *
Wrapper_acquire(Wrapper *self, PyObject *oname)
Wrapper_acquire(Wrapper *self, PyObject *oname,
PyObject *filter, PyObject *extra)
{
PyObject *r;
char *name;
int ir;
if(self->obj && (r=PyObject_GetAttr(self->obj,oname)))
if(self->obj)
{
if(r=PyObject_GetAttr(self->obj,oname))
{
if(r->ob_type==self->ob_type)
{
......@@ -365,15 +422,18 @@ Wrapper_acquire(Wrapper *self, PyObject *oname)
ASSIGN(r,PyECMethod_New(r,(PyObject*)self));
else if(has__of__(r))
ASSIGN(r,CallMethodO(r,py__of__,Build("(O)", self), NULL));
return r;
if(filter)
switch(apply_filter(filter,self->obj,oname,r,extra))
{
case -1: return NULL;
case 1: return r;
}
else return r;
}
PyErr_Clear();
}
if(self->obj) PyErr_Clear();
name=PyString_AsString(oname);
if(*name != '_')
{
if(*name++=='a' && *name++=='q' && *name++=='_')
{
if(strcmp(name,"parent")==0)
......@@ -396,21 +456,23 @@ Wrapper_acquire(Wrapper *self, PyObject *oname)
{
if(isWrapper(self->container))
{
if((r=Wrapper_acquire((Wrapper*)self->container,oname)))
if((r=Wrapper_acquire((Wrapper*)self->container,oname,filter,extra)))
return r;
}
else
{
if((r=PyObject_GetAttr(self->container,oname)))
return r;
if(filter)
switch(apply_filter(filter,self->container,oname,r,extra))
{
case -1: return NULL;
case 1: return r;
}
PyErr_Clear();
else return r;
}
PyErr_Clear();
}
if(*name++=='_' && strcmp(name,"_init__")==0)
return Py_FindAttr((PyObject*)self,oname);
PyErr_SetObject(PyExc_AttributeError,oname);
return NULL;
}
......@@ -601,10 +663,20 @@ static PyMappingMethods Wrapper_as_mapping = {
/* -------------------------------------------------------- */
static PyObject *
Wrapper_acquire_method(Wrapper *self, PyObject *args)
{
PyObject *name, *filter=0, *extra=Py_None;
UNLESS(PyArg_ParseTuple(args,"O|OO",&name,&filter,&extra)) return NULL;
return Wrapper_acquire(self,name,filter,extra);
}
static struct PyMethodDef Wrapper_methods[] = {
{"__init__", (PyCFunction)Wrapper__init__, 0,
"Initialize an Acquirer Wrapper"},
{"acquire", (PyCFunction)Wrapper_acquire, 0,
{"acquire", (PyCFunction)Wrapper_acquire_method, METH_VARARGS,
"Get an attribute, acquiring it if necessary"},
{NULL, NULL} /* sentinel */
};
......@@ -721,7 +793,7 @@ void
initAcquisition()
{
PyObject *m, *d;
char *rev="$Revision: 1.8 $";
char *rev="$Revision: 1.9 $";
PURE_MIXIN_CLASS(Acquirer,
"Base class for objects that implicitly"
" acquire attributes from containers\n"
......@@ -736,7 +808,7 @@ initAcquisition()
/* Create the module and add the functions */
m = Py_InitModule4("Acquisition", methods,
"Provide base classes for acquiring objects\n\n"
"$Id: Acquisition.c,v 1.8 1997/07/02 20:15:27 jim Exp $\n",
"$Id: Acquisition.c,v 1.9 1997/10/28 19:36:46 jim Exp $\n",
(PyObject*)NULL,PYTHON_API_VERSION);
d = PyModule_GetDict(m);
......
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