picrin/attr.c

51 lines
1.1 KiB
C

#include "picrin.h"
#include "picrin/dict.h"
struct pic_dict *
pic_attr(pic_state *pic, pic_value obj)
{
xh_entry *e;
if (pic_vtype(obj) != PIC_VTYPE_HEAP) {
pic_errorf(pic, "attribute: expected heap object, but got immediate value ~s", obj);
}
e = xh_get_ptr(&pic->attrs, pic_ptr(obj));
if (e == NULL) {
struct pic_dict *dict = pic_make_dict(pic);
e = xh_put_ptr(&pic->attrs, pic_ptr(obj), &dict);
assert(dict == xh_val(e, struct pic_dict *));
}
return xh_val(e, struct pic_dict *);
}
pic_value
pic_attr_ref(pic_state *pic, pic_value obj, const char *key)
{
return pic_dict_ref(pic, pic_attr(pic, obj), pic_sym_value(pic_intern_cstr(pic, key)));
}
void
pic_attr_set(pic_state *pic, pic_value obj, const char *key, pic_value v)
{
pic_dict_set(pic, pic_attr(pic, obj), pic_sym_value(pic_intern_cstr(pic, key)), v);
}
static pic_value
pic_attr_attribute(pic_state *pic)
{
pic_value obj;
pic_get_args(pic, "o", &obj);
return pic_obj_value(pic_attr(pic, obj));
}
void
pic_init_attr(pic_state *pic)
{
pic_defun(pic, "attribute", pic_attr_attribute);
}