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#include <lua.h>
#include <lauxlib.h>
#include "object-refs.h"
static char const * const object_ref_table_name = "GSL.objref";
void
object_ref_prepare (lua_State *L)
{
lua_newtable (L);
/* the metatable to define it as a weak table */
lua_newtable (L);
lua_pushstring (L, "k");
lua_setfield (L, -2, "__mode");
lua_setmetatable (L, -2);
lua_setfield (L, LUA_REGISTRYINDEX, object_ref_table_name);
}
void
object_ref_add (lua_State *L, int key_index, int val_index)
{
int ref;
bool add_table = false;
lua_getfield (L, LUA_REGISTRYINDEX, object_ref_table_name);
lua_pushvalue (L, key_index);
lua_rawget (L, -2);
if (lua_isnil (L, -1))
{
lua_pop (L, 1);
lua_newtable (L);
lua_pushvalue (L, val_index);
ref = 1;
add_table = true;
}
else
{
lua_pushvalue (L, val_index);
lua_pushvalue (L, val_index);
lua_rawget (L, -3);
ref = lua_tointeger (L, -1) + 1;
lua_pop (L, 1);
}
lua_pushinteger (L, ref);
lua_rawset (L, -3);
if (add_table)
{
lua_pushvalue (L, key_index);
lua_insert (L, -2);
lua_rawset (L, -3);
lua_pop (L, 1);
}
else
lua_pop (L, 2);
}
void
object_ref_remove (lua_State *L, int key_index, int val_index)
{
lua_getfield (L, LUA_REGISTRYINDEX, object_ref_table_name);
lua_pushvalue (L, key_index);
lua_rawget (L, -2);
if (! lua_isnil (L, -1))
{
int ref;
lua_pushvalue (L, val_index);
lua_pushvalue (L, val_index);
lua_rawget (L, -3);
ref = lua_tointeger (L, -1);
lua_pop (L, 1);
if (ref <= 1)
lua_pushnil (L);
else
lua_pushinteger (L, ref - 1);
lua_rawset (L, -3);
}
lua_pop (L, 2);
}
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