--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/utility.c Fri Sep 21 14:35:11 2007 -0400 @@ -0,0 +1,45 @@ +/* LuaEvent - Copyright (C) 2007 Thomas Harning <harningt@gmail.com> + * Licensed as LGPL - See doc/COPYING for details */ +#include "utility.h" +#include <lauxlib.h> + +#define WEAK_REF_LOCATION le_register_utility + +static void get_weakref_table(lua_State* L) { + lua_pushlightuserdata(L, WEAK_REF_LOCATION); + lua_gettable(L, LUA_REGISTRYINDEX); +} + +void le_weak_ref(lua_State* L, void* ptr, int idx) { + get_weakref_table(L); + lua_pushlightuserdata(L, ptr); + if(idx < 0) idx-=2; + lua_pushvalue(L, idx); + lua_settable(L, -3); +} +void le_weak_unref(lua_State* L, void* ptr) { + get_weakref_table(L); + lua_pushlightuserdata(L, ptr); + lua_pushnil(L); + lua_settable(L, -3); +} + +void le_weak_get(lua_State* L, void* ptr) { + get_weakref_table(L); + lua_pushlightuserdata(L, ptr); + lua_gettable(L, -2); +} + +static void push_weak_table(lua_State* L, const char* mode) { + lua_newtable(L); + lua_createtable(L,0,1); + lua_pushstring(L,mode); + lua_setfield(L,-2,"__mode"); + lua_setmetatable(L,-2); +} + +void le_register_utility(lua_State* L) { + lua_pushlightuserdata(L, WEAK_REF_LOCATION); + push_weak_table(L, "v"); + lua_settable(L, LUA_REGISTRYINDEX); +}