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KioM, please describe in more detail what you need, because as I understand it, the "building visitation handler" is a function that triggers when a building is visited. In that case, it's unclear what the problem is if there's a trigger for touching the object.

It might be slightly easier to save the current date in a variable during activation, and then compare the date with this variable when the object is touched.

The following code is provided:

local NHF_Trigger_env = {trig = {}}
print("T1:");
NHF_Trigger_env.Trigger = Trigger
function NHF_Trigger_env.tostring(a)
	return a and (a.."" ~= a and a or '"'..a..'"') or "nil"
end;
function NHF_Trigger_env.emptytable(t)
	print("T2:");
	for k,v in t do
		if v then return nil end
	end
	return 1
end;
function NHF_Trigger_env.hasparam(i)
	print("T3:");
	return i ~= 0 and i ~= 10 and i ~= 11
end;
function __HANDLER(trigtype, param)
	print("T4:");
	print("T5:");
	local h = %NHF_Trigger_env.trig[trigtype]
	if not h then return end
	local NHF_Trigger_env = %NHF_Trigger_env
	return function(a, b, c, d)
		a = %NHF_Trigger_env.tostring(a)
		b = %NHF_Trigger_env.tostring(b)
		c = %NHF_Trigger_env.tostring(c)
		d = %NHF_Trigger_env.tostring(d)
		local args = "(" .. a .. "," .. b .. "," .. c .. "," .. d .. ")"
		print("T6:");
		for sender, tab in %h do
			if sender ~= 0 then
				local handler = %NHF_Trigger_env.hasparam(%trigtype) and tab and tab[%param] or tab
				if handler then
					startThread(parse(handler .. args))
				end
			end
		end		
		local tab = %h[0]
		print("T7:");
		if tab then
			local handler = %NHF_Trigger_env.hasparam(%trigtype) and tab and tab[%param] or tab
			if handler then
				print("T8:");
				startThread(parse(handler .. args))
			end
		end
	end
end;
function Trigger(sender, trig, par, handler)
	print("T9:");
	if sender .. "" ~= sender then
		print("T10:");
		sender, trig, par, handler = 0, sender, trig, par
	end
	if not %NHF_Trigger_env.hasparam(trig) then
		print("T11:");
		par, handler = nil, par
	end
	local need_disable = handler ~= nil
	if handler then
		print("T12:");
		%NHF_Trigger_env.trig[trig] = %NHF_Trigger_env.trig[trig] or {}
		if par then
			print("T13:");
			%NHF_Trigger_env.trig[trig][sender] = %NHF_Trigger_env.trig[trig][sender] or {}
			%NHF_Trigger_env.trig[trig][sender][par] = handler
		else
			print("T14:");
			%NHF_Trigger_env.trig[trig][sender] = handler
		end
	else
		print("T15:");
		if %NHF_Trigger_env.trig[trig] then
			if %NHF_Trigger_env.trig[trig][sender] then
				if par then
				print("T16:");
					%NHF_Trigger_env.trig[trig][sender][par] = nil
					need_disable = %NHF_Trigger_env.emptytable(%NHF_Trigger_env.trig[trig][sender])
					if need_disable then %NHF_Trigger_env.trig[trig][sender] = nil end
				else
					%NHF_Trigger_env.trig[trig][sender] = nil
				end
				need_disable = %NHF_Trigger_env.emptytable(%NHF_Trigger_env.trig[trig])
				if need_disable then %NHF_Trigger_env.trig[trig] = nil end
			end
		end
	end
	if not need_disable then return end
	if par then
		print("T17:");
		%NHF_Trigger_env.Trigger(trig, par, handler and "__HANDLER(" .. trig .. "," .. %NHF_Trigger_env.tostring(par) .. ")")
	else
		%NHF_Trigger_env.Trigger(trig, handler and "__HANDLER(" .. trig .. ")")
	end
	print("T18:end");
end;

It produces an error:


Do you have any idea what might be wrong here?

What parameters were used when the overridden Trigger was called?

Type: OBJECT_TOUCH_TRIGGER
The check for the existence of a hero and a monster is in place.

function __HANDLER(trigtype, param)
	print("T4:"..trigtype);
	print("T5:"..param);

With each trigger being called in a separate thread and with the necessary delays depending on whether it's a multiplayer map or not, it can be made to work in multiplayer. At least, some of the triggers will work somehow.

Is the trigger's sender specified as something else?
In other words, should all triggers in the mod have an additional first parameter – the sender?
For example,
Trigger("NHF", OBJECT_TOUCH_TRIGGER, "mob", "handler_function")

Added 2 minutes later
Each unique sender can have its own trigger for a given event type and parameter (object, player, etc.).

Yes, I tried both ways. The result is the same.
If you redefine the Trigger in the map itself, it works. With a different sender parameter. But you won't be rewriting the scripts of ready-made maps...

Another question is about resetting the trigger, so that only the necessary one is reset. Would this be correct:
Trigger("NHF", OBJECT_TOUCH_TRIGGER, mob, nil);?

And if the Trigger(OBJECT_TOUCH_TRIGGER, mob, nil); is reset in the map itself, will it affect all of them?

As I understand it, if the first parameter = nil, this is also a unique sender parameter.