From 0e0e4a480e6d9b0125a96ca982a3e9571578a037 Mon Sep 17 00:00:00 2001
From: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
Date: Wed, 11 Apr 2001 11:42:41 -0300
Subject: first implementation for weak tables

---
 lbaselib.c | 26 +++++++++++++++++++++++++-
 1 file changed, 25 insertions(+), 1 deletion(-)

(limited to 'lbaselib.c')

diff --git a/lbaselib.c b/lbaselib.c
index d0dd1e9f..4a979814 100644
--- a/lbaselib.c
+++ b/lbaselib.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lbaselib.c,v 1.31 2001/03/26 14:31:49 roberto Exp roberto $
+** $Id: lbaselib.c,v 1.32 2001/04/06 18:25:00 roberto Exp roberto $
 ** Basic library
 ** See Copyright Notice in lua.h
 */
@@ -169,6 +169,29 @@ static int luaB_settag (lua_State *L) {
   return 1;  /* return table */
 }
 
+static int luaB_weakmode (lua_State *L) {
+  const char *mode = luaL_opt_string(L, 2, NULL);
+  luaL_checktype(L, 1, LUA_TTABLE);
+  if (mode == NULL) {
+    char buff[3];
+    char *s = buff;
+    int imode = lua_getweakmode(L, 1);
+    if (imode & LUA_WEAK_KEY) *s++ = 'k';
+    if (imode & LUA_WEAK_VALUE) *s++ = 'v';
+    *s = '\0';
+    lua_pushstring(L, buff);
+    return 1;
+  }
+  else {
+    int imode = 0;
+    lua_pushvalue(L, 1);  /* push table */
+    if (strchr(mode, l_c('k'))) imode |= LUA_WEAK_KEY;
+    if (strchr(mode, l_c('v'))) imode |= LUA_WEAK_VALUE;
+    lua_setweakmode(L, imode);
+    return 1;
+  }
+}
+
 static int luaB_newtype (lua_State *L) {
   const l_char *name = luaL_opt_string(L, 1, NULL);
   lua_pushnumber(L, lua_newtype(L, name, LUA_TTABLE));
@@ -753,6 +776,7 @@ static const luaL_reg base_funcs[] = {
   {l_s("tremove"), luaB_tremove},
   {l_s("unwrap"), luaB_unwrap},
   {l_s("xtype"), luaB_xtype},
+  {l_s("weakmode"), luaB_weakmode}
 };
 
 
-- 
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