346 lines
7.1 KiB
C
346 lines
7.1 KiB
C
/***********************************************************
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Copyright 1991 by Stichting Mathematisch Centrum, Amsterdam, The
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Netherlands.
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and its
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documentation for any purpose and without fee is hereby granted,
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provided that the above copyright notice appear in all copies and that
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both that copyright notice and this permission notice appear in
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supporting documentation, and that the names of Stichting Mathematisch
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Centrum or CWI not be used in advertising or publicity pertaining to
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distribution of the software without specific, written prior permission.
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STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
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THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
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FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
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FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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******************************************************************/
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/* Class object implementation */
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#include "allobjects.h"
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#include "structmember.h"
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typedef struct {
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OB_HEAD
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object *cl_bases; /* A tuple */
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object *cl_methods; /* A dictionary */
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object *cl_name; /* A string */
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} classobject;
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object *
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newclassobject(bases, methods, name)
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object *bases; /* NULL or tuple of classobjects! */
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object *methods;
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object *name; /* String; NULL if unknown */
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{
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classobject *op;
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if (bases == NULL) {
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bases = newtupleobject(0);
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if (bases == NULL)
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return err_nomem();
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}
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else
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INCREF(bases);
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op = NEWOBJ(classobject, &Classtype);
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if (op == NULL) {
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DECREF(bases);
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return NULL;
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}
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op->cl_bases = bases;
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INCREF(methods);
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op->cl_methods = methods;
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XINCREF(name);
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op->cl_name = name;
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return (object *) op;
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}
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/* Class methods */
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static void
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class_dealloc(op)
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classobject *op;
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{
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DECREF(op->cl_bases);
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DECREF(op->cl_methods);
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XDECREF(op->cl_name);
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free((ANY *)op);
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}
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static object *
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class_getattr(op, name)
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register classobject *op;
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register char *name;
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{
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register object *v;
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if (strcmp(name, "__dict__") == 0) {
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INCREF(op->cl_methods);
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return op->cl_methods;
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}
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if (strcmp(name, "__bases__") == 0) {
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INCREF(op->cl_bases);
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return op->cl_bases;
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}
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if (strcmp(name, "__name__") == 0) {
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if (op->cl_name == NULL)
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v = None;
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else
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v = op->cl_name;
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INCREF(v);
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return v;
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}
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v = dictlookup(op->cl_methods, name);
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if (v != NULL) {
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INCREF(v);
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return v;
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}
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{
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int n = gettuplesize(op->cl_bases);
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int i;
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for (i = 0; i < n; i++) {
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v = class_getattr((classobject *)
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gettupleitem(op->cl_bases, i), name);
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if (v != NULL)
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return v;
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err_clear();
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}
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}
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err_setstr(AttributeError, name);
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return NULL;
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}
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static int
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class_setattr(op, name, v)
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classobject *op;
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char *name;
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object *v;
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{
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if (v == NULL)
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return dictremove(op->cl_methods, name);
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else
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return dictinsert(op->cl_methods, name, v);
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}
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typeobject Classtype = {
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OB_HEAD_INIT(&Typetype)
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0,
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"class",
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sizeof(classobject),
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0,
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class_dealloc, /*tp_dealloc*/
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0, /*tp_print*/
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class_getattr, /*tp_getattr*/
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class_setattr, /*tp_setattr*/
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0, /*tp_compare*/
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0, /*tp_repr*/
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0, /*tp_as_number*/
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0, /*tp_as_sequence*/
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0, /*tp_as_mapping*/
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};
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/* We're not done yet: next, we define instance objects... */
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typedef struct {
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OB_HEAD
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classobject *in_class; /* The class object */
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object *in_attr; /* A dictionary */
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} instanceobject;
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object *
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newinstanceobject(class)
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register object *class;
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{
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register instanceobject *inst;
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if (!is_classobject(class)) {
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err_badcall();
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return NULL;
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}
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inst = NEWOBJ(instanceobject, &Instancetype);
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if (inst == NULL)
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return NULL;
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INCREF(class);
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inst->in_class = (classobject *)class;
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inst->in_attr = newdictobject();
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if (inst->in_attr == NULL) {
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DECREF(inst);
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return NULL;
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}
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return (object *)inst;
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}
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/* Instance methods */
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static void
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instance_dealloc(inst)
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register instanceobject *inst;
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{
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DECREF(inst->in_class);
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if (inst->in_attr != NULL)
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DECREF(inst->in_attr);
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free((ANY *)inst);
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}
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static object *
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instance_getattr(inst, name)
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register instanceobject *inst;
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register char *name;
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{
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register object *v;
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if (strcmp(name, "__dict__") == 0) {
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INCREF(inst->in_attr);
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return inst->in_attr;
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}
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if (strcmp(name, "__class__") == 0) {
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INCREF(inst->in_class);
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return (object *)inst->in_class;
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}
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v = dictlookup(inst->in_attr, name);
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if (v != NULL) {
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INCREF(v);
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return v;
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}
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v = class_getattr(inst->in_class, name);
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if (v == NULL)
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return v; /* class_getattr() has set the error */
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if (is_funcobject(v)) {
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object *w = newinstancemethodobject(v, (object *)inst);
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DECREF(v);
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return w;
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}
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DECREF(v);
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err_setstr(AttributeError, name);
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return NULL;
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}
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static int
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instance_setattr(inst, name, v)
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instanceobject *inst;
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char *name;
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object *v;
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{
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if (v == NULL)
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return dictremove(inst->in_attr, name);
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else
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return dictinsert(inst->in_attr, name, v);
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}
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typeobject Instancetype = {
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OB_HEAD_INIT(&Typetype)
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0,
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"instance",
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sizeof(instanceobject),
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0,
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instance_dealloc, /*tp_dealloc*/
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0, /*tp_print*/
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instance_getattr, /*tp_getattr*/
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instance_setattr, /*tp_setattr*/
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0, /*tp_compare*/
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0, /*tp_repr*/
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0, /*tp_as_number*/
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0, /*tp_as_sequence*/
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0, /*tp_as_mapping*/
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};
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/* And finally, here are instance method objects */
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typedef struct {
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OB_HEAD
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object *im_func; /* The method function */
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object *im_self; /* The object to which this applies */
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} instancemethodobject;
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object *
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newinstancemethodobject(func, self)
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object *func;
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object *self;
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{
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register instancemethodobject *im;
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if (!is_funcobject(func)) {
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err_badcall();
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return NULL;
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}
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im = NEWOBJ(instancemethodobject, &Instancemethodtype);
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if (im == NULL)
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return NULL;
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INCREF(func);
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im->im_func = func;
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INCREF(self);
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im->im_self = self;
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return (object *)im;
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}
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object *
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instancemethodgetfunc(im)
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register object *im;
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{
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if (!is_instancemethodobject(im)) {
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err_badcall();
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return NULL;
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}
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return ((instancemethodobject *)im)->im_func;
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}
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object *
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instancemethodgetself(im)
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register object *im;
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{
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if (!is_instancemethodobject(im)) {
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err_badcall();
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return NULL;
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}
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return ((instancemethodobject *)im)->im_self;
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}
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/* Class method methods */
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#define OFF(x) offsetof(instancemethodobject, x)
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static struct memberlist instancemethod_memberlist[] = {
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{"im_func", T_OBJECT, OFF(im_func)},
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{"im_self", T_OBJECT, OFF(im_self)},
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{NULL} /* Sentinel */
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};
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static object *
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instancemethod_getattr(im, name)
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register instancemethodobject *im;
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char *name;
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{
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return getmember((char *)im, instancemethod_memberlist, name);
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}
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static void
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instancemethod_dealloc(im)
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register instancemethodobject *im;
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{
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DECREF(im->im_func);
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DECREF(im->im_self);
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free((ANY *)im);
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}
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typeobject Instancemethodtype = {
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OB_HEAD_INIT(&Typetype)
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0,
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"instance method",
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sizeof(instancemethodobject),
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0,
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instancemethod_dealloc, /*tp_dealloc*/
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0, /*tp_print*/
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instancemethod_getattr, /*tp_getattr*/
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0, /*tp_setattr*/
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0, /*tp_compare*/
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0, /*tp_repr*/
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0, /*tp_as_number*/
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0, /*tp_as_sequence*/
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0, /*tp_as_mapping*/
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};
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