qse/ase/stx/class.c

117 lines
3.1 KiB
C

/*
* $Id: class.c,v 1.21 2005-07-07 07:45:05 bacon Exp $
*/
#include <xp/stx/class.h>
#include <xp/stx/symbol.h>
#include <xp/stx/object.h>
#include <xp/stx/hash.h>
#include <xp/stx/misc.h>
xp_word_t xp_stx_new_class (xp_stx_t* stx, const xp_char_t* name)
{
xp_word_t meta, class;
xp_word_t class_name;
meta = xp_stx_alloc_word_object (
stx, XP_NULL, XP_STX_METACLASS_SIZE, XP_NULL, 0);
XP_STX_CLASS(stx,meta) = stx->class_metaclass;
/* the spec of the metaclass must be the spec of its
* instance. so the XP_STX_CLASS_SIZE is set */
XP_STX_WORDAT(stx,meta,XP_STX_METACLASS_SPEC) =
XP_STX_TO_SMALLINT((XP_STX_CLASS_SIZE << XP_STX_SPEC_INDEXABLE_BITS) | XP_STX_SPEC_NOT_INDEXABLE);
/* the spec of the class is set later in __create_builtin_classes */
class = xp_stx_alloc_word_object (
stx, XP_NULL, XP_STX_CLASS_SIZE, XP_NULL, 0);
XP_STX_CLASS(stx,class) = meta;
class_name = xp_stx_new_symbol (stx, name);
XP_STX_WORDAT(stx,class,XP_STX_CLASS_NAME) = class_name;
xp_stx_hash_insert (stx, stx->smalltalk,
xp_stx_hash_object(stx, class_name),
class_name, class);
return class;
}
xp_word_t xp_stx_lookup_class (xp_stx_t* stx, const xp_char_t* name)
{
xp_word_t link, meta, value;
link = xp_stx_hash_lookup_symbol (stx, stx->smalltalk, name);
if (link == stx->nil) return stx->nil;
value = XP_STX_WORDAT(stx,link,XP_STX_PAIRLINK_VALUE);
meta = XP_STX_CLASS(stx,value);
if (XP_STX_CLASS(stx,meta) != stx->class_metaclass) return stx->nil;
return value;
}
int xp_stx_get_instance_variable_index (
xp_stx_t* stx, xp_word_t class_index,
const xp_char_t* name, xp_word_t* index)
{
xp_word_t index_super = 0;
xp_stx_class_t* class_obj;
xp_stx_char_object_t* string;
class_obj = (xp_stx_class_t*)XP_STX_OBJECT(stx, class_index);
xp_assert (class_obj != XP_NULL);
if (class_obj->superclass != stx->nil) {
if (xp_stx_get_instance_variable_index (
stx, class_obj->superclass, name, &index_super) == 0) {
*index = index_super;
return 0;
}
}
if (class_obj->header.class == stx->class_metaclass) {
/* metaclass */
/* TODO: can a metaclas have instance variables? */
*index = index_super;
}
else {
if (class_obj->variables == stx->nil) *index = 0;
else {
string = XP_STX_CHAR_OBJECT(stx, class_obj->variables);
if (xp_stx_strword(string->data, name, index) != XP_NULL) {
*index += index_super;
return 0;
}
}
*index += index_super;
}
return -1;
}
xp_word_t xp_stx_lookup_class_variable (
xp_stx_t* stx, xp_word_t class_index, const xp_char_t* name)
{
xp_stx_class_t* class_obj;
class_obj = (xp_stx_class_t*)XP_STX_OBJECT(stx, class_index);
xp_assert (class_obj != XP_NULL);
if (class_obj->superclass != stx->nil) {
xp_word_t tmp;
tmp = xp_stx_lookup_class_variable (
stx, class_obj->superclass, name);
if (tmp != stx->nil) return tmp;
}
/* TODO: can a metaclas have class variables? */
if (class_obj->header.class != stx->class_metaclass &&
class_obj->class_variables != stx->nil) {
if (xp_stx_hash_lookup_symbol(stx,
class_obj->class_variables, name) != stx->nil) return class_index;
}
return stx->nil;
}