Function TraverseTable

Plugins/UnLua/Source/UnLua/Private/LuaCore.cpp:1252–1284

* Traverse a Lua table */

 * Traverse a Lua table
 */
int32 TraverseTable(lua_State *L, int32 Index, void *Userdata, bool(*TraverseWorker)(lua_State*, void*))
{
    if (Index < 0 && Index > LUA_REGISTRYINDEX)
    {
        int32 Top = lua_gettop(L);
        Index = Top + Index + 1;
    }
    int32 Type = lua_type(L, Index);
    if (Type == LUA_TTABLE)
    {
        if (!lua_checkstack(L, 2))
        {
            return INDEX_NONE;
        }

        int32 NumElements = 0;
        lua_pushnil(L);
        while (lua_next(L, Index) != 0)
        {
            if (TraverseWorker)
            {
                bool b = TraverseWorker(L, Userdata);
                if (b)
                {
                    ++NumElements;
                }
            }
            lua_pop(L, 1);
        }
        return NumElements;
    }
    return INDEX_NONE;
}

/**
 * __index meta methods for enum