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/* Class object implementation */
#include "allobjects.h"
#include "structmember.h"
typedef struct {
OB_HEAD
object *cl_bases; /* A tuple */
object *cl_methods; /* A dictionary */
} classobject;
object *
newclassobject(bases, methods)
object *bases; /* NULL or tuple of classobjects! */
object *methods;
{
classobject *op;
op = NEWOBJ(classobject, &Classtype);
if (op == NULL)
return NULL;
if (bases != NULL)
INCREF(bases);
op->cl_bases = bases;
INCREF(methods);
op->cl_methods = methods;
return (object *) op;
}
/* Class methods */
static void
class_dealloc(op)
classobject *op;
{
int i;
if (op->cl_bases != NULL)
DECREF(op->cl_bases);
DECREF(op->cl_methods);
free((ANY *)op);
}
static object *
class_getattr(op, name)
register classobject *op;
register char *name;
{
register object *v;
v = dictlookup(op->cl_methods, name);
if (v != NULL) {
INCREF(v);
return v;
}
if (op->cl_bases != NULL) {
int n = gettuplesize(op->cl_bases);
int i;
for (i = 0; i < n; i++) {
v = class_getattr(gettupleitem(op->cl_bases, i), name);
if (v != NULL)
return v;
err_clear();
}
}
err_setstr(NameError, name);
return NULL;
}
typeobject Classtype = {
OB_HEAD_INIT(&Typetype)
0,
"class",
sizeof(classobject),
0,
class_dealloc, /*tp_dealloc*/
0, /*tp_print*/
class_getattr, /*tp_getattr*/
0, /*tp_setattr*/
0, /*tp_compare*/
0, /*tp_repr*/
0, /*tp_as_number*/
0, /*tp_as_sequence*/
0, /*tp_as_mapping*/
};
/* We're not done yet: next, we define class member objects... */
typedef struct {
OB_HEAD
classobject *cm_class; /* The class object */
object *cm_attr; /* A dictionary */
} classmemberobject;
object *
newclassmemberobject(class)
register object *class;
{
register classmemberobject *cm;
if (!is_classobject(class)) {
err_badcall();
return NULL;
}
cm = NEWOBJ(classmemberobject, &Classmembertype);
if (cm == NULL)
return NULL;
INCREF(class);
cm->cm_class = (classobject *)class;
cm->cm_attr = newdictobject();
if (cm->cm_attr == NULL) {
DECREF(cm);
return NULL;
}
return (object *)cm;
}
/* Class member methods */
static void
classmember_dealloc(cm)
register classmemberobject *cm;
{
DECREF(cm->cm_class);
if (cm->cm_attr != NULL)
DECREF(cm->cm_attr);
free((ANY *)cm);
}
static object *
classmember_getattr(cm, name)
register classmemberobject *cm;
register char *name;
{
register object *v = dictlookup(cm->cm_attr, name);
if (v != NULL) {
INCREF(v);
return v;
}
v = class_getattr(cm->cm_class, name);
if (v == NULL)
return v; /* class_getattr() has set the error */
if (is_funcobject(v)) {
object *w = newclassmethodobject(v, (object *)cm);
DECREF(v);
return w;
}
DECREF(v);
err_setstr(NameError, name);
return NULL;
}
static int
classmember_setattr(cm, name, v)
classmemberobject *cm;
char *name;
object *v;
{
if (v == NULL)
return dictremove(cm->cm_attr, name);
else
return dictinsert(cm->cm_attr, name, v);
}
typeobject Classmembertype = {
OB_HEAD_INIT(&Typetype)
0,
"class member",
sizeof(classmemberobject),
0,
classmember_dealloc, /*tp_dealloc*/
0, /*tp_print*/
classmember_getattr, /*tp_getattr*/
classmember_setattr, /*tp_setattr*/
0, /*tp_compare*/
0, /*tp_repr*/
0, /*tp_as_number*/
0, /*tp_as_sequence*/
0, /*tp_as_mapping*/
};
/* And finally, here are class method objects */
/* (Really methods of class members) */
typedef struct {
OB_HEAD
object *cm_func; /* The method function */
object *cm_self; /* The object to which this applies */
} classmethodobject;
object *
newclassmethodobject(func, self)
object *func;
object *self;
{
register classmethodobject *cm;
if (!is_funcobject(func)) {
err_badcall();
return NULL;
}
cm = NEWOBJ(classmethodobject, &Classmethodtype);
if (cm == NULL)
return NULL;
INCREF(func);
cm->cm_func = func;
INCREF(self);
cm->cm_self = self;
return (object *)cm;
}
object *
classmethodgetfunc(cm)
register object *cm;
{
if (!is_classmethodobject(cm)) {
err_badcall();
return NULL;
}
return ((classmethodobject *)cm)->cm_func;
}
object *
classmethodgetself(cm)
register object *cm;
{
if (!is_classmethodobject(cm)) {
err_badcall();
return NULL;
}
return ((classmethodobject *)cm)->cm_self;
}
/* Class method methods */
#define OFF(x) offsetof(classmethodobject, x)
static struct memberlist classmethod_memberlist[] = {
{"cm_func", T_OBJECT, OFF(cm_func)},
{"cm_self", T_OBJECT, OFF(cm_self)},
{NULL} /* Sentinel */
};
static object *
classmethod_getattr(cm, name)
register classmethodobject *cm;
char *name;
{
return getmember((char *)cm, classmethod_memberlist, name);
}
static void
classmethod_dealloc(cm)
register classmethodobject *cm;
{
DECREF(cm->cm_func);
DECREF(cm->cm_self);
free((ANY *)cm);
}
typeobject Classmethodtype = {
OB_HEAD_INIT(&Typetype)
0,
"class method",
sizeof(classmethodobject),
0,
classmethod_dealloc, /*tp_dealloc*/
0, /*tp_print*/
classmethod_getattr, /*tp_getattr*/
0, /*tp_setattr*/
0, /*tp_compare*/
0, /*tp_repr*/
0, /*tp_as_number*/
0, /*tp_as_sequence*/
0, /*tp_as_mapping*/
};
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