Method AttachEnumKeys

library/LuaWrapper.cpp:1296–1321

* If ienum refers to a valid enum, attach its keys to UPVAL_FIELDTABLE, * and the enum itself to the _enum metafield. Pushes the key table on the stack */

 * and the enum itself to the _enum metafield. Pushes the key table on the stack
 */
void LuaWrapper::AttachEnumKeys(lua_State *state, int meta_idx, int ftable_idx, const type_identity *ienum)
{
    EnableMetaField(state, ftable_idx, "_enum");

    LookupInTable(state, const_cast<type_identity*>(ienum), &DFHACK_TYPEID_TABLE_TOKEN);
    lua_setfield(state, meta_idx, "_enum");

    LookupInTable(state, const_cast<type_identity*>(ienum), &DFHACK_ENUM_TABLE_TOKEN);

    if (!lua_isnil(state, -1))
    {
        lua_dup(state);
        lua_newtable(state);
        lua_swap(state);
        lua_setfield(state, -2, "__index");
        lua_setmetatable(state, ftable_idx);
    }
    else
    {
        lua_pop(state, 1);
        lua_rawgetp(state, LUA_REGISTRYINDEX, &DFHACK_EMPTY_TABLE_TOKEN);
    }

    lua_dup(state);
    lua_setfield(state, meta_idx, "_index_table");
}

static void BuildTypeMetatable(lua_State *state, const type_identity *type)
{