public static IntPtr CheckUData(this LuaState state, int ud, string name)
{
IntPtr p = state.ToUserData(ud);
if (p == IntPtr.Zero)
{
return(IntPtr.Zero);
}
if (!state.GetMetaTable(ud))
{
return(IntPtr.Zero);
}
state.GetField(LuaRegistry.Index, name);
bool isEqual = state.RawEqual(-1, -2);
state.Pop(2);
if (isEqual)
{
return(p);
}
return(IntPtr.Zero);
}
/// <summary>
/// <para>Return a debug.traceback() call result (a multi-line string, containing a full stack trace, including C calls.</para>
/// <para>Note: it won't return anything unless the interpreter is in the middle of execution - that is, it only makes sense to call it from a method called from Lua, or during a coroutine yield.</para>
/// </summary>
public string GetDebugTraceback()
{
int oldTop = luaState.GetTop();
luaState.GetGlobal("debug"); // stack: debug
luaState.GetField(-1, "traceback"); // stack: debug,traceback
luaState.Remove(-2); // stack: traceback
luaState.PCall(0, -1, 0);
return(translator.PopValues(luaState, oldTop)[0] as string);
}
/// <summary>
/// Push a debug.traceback reference onto the stack, for a pcall function to use as error handler. (Remember to increment any top-of-stack markers!)
/// </summary>
private static int PushDebugTraceback(LuaState luaState, int argCount)
{
luaState.GetGlobal("debug");
luaState.GetField(-1, "traceback");
luaState.Remove(-2);
int errindex = -argCount - 2;
luaState.Insert(errindex);
return(errindex);
}