#include "luastack.hpp"
#include "globaldb.hpp"


LuaDefine(global, "globalname", "get a table where global data can be stored") {
    LuaArg globalname;
    LuaRet globaltab;
    LuaVar globaldb;
    LuaStack LS(L, globalname, globaltab, globaldb);

    // Get a pointer to the globaldb.
    LS.rawget(globaldb, LuaRegistry, "globaldb");
    if (!LS.istable(globaldb)) {
        return lua_yield(L, 0); // donotpredict
    }

    LS.checkstring(globalname);

    // Get the globaltab from the globaldb, sanity check it.
    LS.rawget(globaltab, globaldb, globalname);
    if (LS.istable(globaltab)) {
        return LS.result();
    } else if (!LS.isnil(globaltab)) {
        luaL_error(L, "%s is not a global", LS.ckstring(globalname).c_str());
    }

    // Create a new globaltab and store it in the globaldb.
    LS.newtable(globaltab);
    LS.rawset(globaldb, globalname, globaltab);
    LS.rawset(globaltab, "__global", globalname);
    LS.settabletype(globaltab, LUA_TT_GLOBALDB);
    return LS.result();
}