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inheritance is not built-in

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Roberto Ierusalimschy 1994-11-07 13:19:51 -02:00
parent 0a5dce5704
commit 62ec3797d5
1 changed files with 5 additions and 35 deletions
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40
hash.c
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@ -3,7 +3,7 @@
** hash manager for lua ** hash manager for lua
*/ */
char *rcs_hash="$Id: hash.c,v 2.11 1994/11/02 20:29:09 roberto Exp roberto $"; char *rcs_hash="$Id: hash.c,v 2.12 1994/11/03 22:20:15 roberto Exp $";
#include <string.h> #include <string.h>
#include <stdlib.h> #include <stdlib.h>
@ -235,47 +235,17 @@ static void rehash (Hash *t)
} }
/* /*
** If the hash node is present, return its pointer, otherwise search ** If the hash node is present, return its pointer, otherwise return
** the node at parent table, recursively, if there is parent. ** null.
** If no parent and the node is not present, return a static nil object.
*/ */
Object *lua_hashget (Hash *t, Object *ref) Object *lua_hashget (Hash *t, Object *ref)
{ {
static int count = 1000;
static Object nil_obj = {LUA_T_NIL, {NULL}};
int h = present(t, ref); int h = present(t, ref);
if (tag(ref(node(t, h))) != LUA_T_NIL) return val(node(t, h)); if (tag(ref(node(t, h))) != LUA_T_NIL) return val(node(t, h));
if (--count == 0) else return NULL;
lua_reportbug ("hierarchy too deep (maybe there is an inheritance loop)");
{ /* check "parent" or "godparent" field */
Hash *p;
Object parent;
Object godparent;
tag(&parent) = LUA_T_STRING; svalue(&parent) = "parent";
tag(&godparent) = LUA_T_STRING; svalue(&godparent) = "godparent";
h = present(t, &parent);
p = tag(ref(node(t, h))) != LUA_T_NIL && tag(val(node(t, h))) == LUA_T_ARRAY ?
avalue(val(node(t, h))) : NULL;
if (p != NULL)
{
Object *r = lua_hashget(p, ref);
if (tag(r) != LUA_T_NIL) { count++; return r; }
}
h = present(t, &godparent);
p = tag(ref(node(t, h))) != LUA_T_NIL && tag(val(node(t, h))) == LUA_T_ARRAY ?
avalue(val(node(t, h))) : NULL;
if (p != NULL)
{
Object *r = lua_hashget(p, ref);
if (tag(r) != LUA_T_NIL) { count++; return r; }
}
}
count++;
return &nil_obj;
} }
/* /*
** If the hash node is present, return its pointer, otherwise create a new ** If the hash node is present, return its pointer, otherwise create a new
** node for the given reference and also return its pointer. ** node for the given reference and also return its pointer.