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Implementacao de heranca multipla.

This commit is contained in:
Waldemar Celes 1994-09-08 12:27:10 -03:00
parent 1ea0d09281
commit b826a39919
1 changed files with 53 additions and 15 deletions
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68
hash.c
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@ -3,7 +3,7 @@
** hash manager for lua
*/
char *rcs_hash="$Id: hash.c,v 2.5 1994/08/17 15:03:11 celes Exp $";
char *rcs_hash="$Id: hash.c,v 2.6 1994/08/17 17:41:23 celes Exp celes $";
#include <string.h>
#include <stdlib.h>
@ -265,23 +265,61 @@ static void rehash (Hash *t)
*/
Object *lua_hashget (Hash *t, Object *ref)
{
static int count = 1000;
static Object nil_obj = {T_NIL, {NULL}};
Object parent;
int count = 1000;
tag(&parent) = T_STRING;
svalue(&parent) = "parent";
do
int h = present(t, ref);
if (h < 0) return NULL;
if (tag(ref(node(t, h))) != T_NIL) return val(node(t, h));
if (--count == 0)
{
int h = present(t, ref);
if (h < 0) return NULL;
if (tag(ref(node(t, h))) != T_NIL) return val(node(t, h));
h = present(t, &parent); /* assert(p >= 0); */
t = tag(ref(node(t, h))) != T_NIL && tag(val(node(t, h))) == T_ARRAY ?
lua_reportbug ("hierarchy too deep (maybe there is an inheritance loop)");
return &nil_obj;
}
{ /* check "parent" field */
Hash *p;
Object parent;
tag(&parent) = T_STRING;
svalue(&parent) = "parent";
h = present(t, &parent); /* assert(h >= 0); */
p = tag(ref(node(t, h))) != T_NIL && tag(val(node(t, h))) == T_ARRAY ?
avalue(val(node(t, h))) : NULL;
} while (t != NULL && --count);
if (count == 0)
lua_reportbug ("hierarchy too deep (maybe there is an inheritance loop)");
if (p != NULL)
{
Object *r = lua_hashget(p, ref);
if (tag(r) != T_NIL) { count++; return r; }
}
}
{ /* check "parents" field */
Hash *ps;
Object parents;
tag(&parents) = T_STRING;
svalue(&parents) = "parents";
h = present(t, &parents); /* assert(h >= 0); */
ps = tag(ref(node(t, h))) != T_NIL && tag(val(node(t, h))) == T_ARRAY ?
avalue(val(node(t, h))) : NULL;
if (ps != NULL)
{
Hash *p;
Object index;
tag(&index) = T_NUMBER;
nvalue(&index) = 1;
h = present(ps, &index);
p = tag(ref(node(ps, h))) != T_NIL && tag(val(node(ps, h))) == T_ARRAY ?
avalue(val(node(ps, h))) : NULL;
while (p != NULL)
{
Object *r = lua_hashget(p, ref);
if (tag(r) != T_NIL) { count++; return r; }
nvalue(&index)++;
h = present(ps, &index);
p = tag(ref(node(ps, h))) != T_NIL && tag(val(node(ps, h))) == T_ARRAY ?
avalue(val(node(ps, h))) : NULL;
}
}
}
count++;
return &nil_obj;
}