Properly handle repeater signals

advtrains_interlocking/signal_aspect_accessors.lua

@@ -4,6 +4,27 @@ local I = advtrains.interlocking
 local N = advtrains.ndb
 local pts = advtrains.roundfloorpts
 
+local signal_aspect_metatable = {
+	__tostring = function(asp)
+		local st = {}
+		if asp.type2group and asp.type2name then
+			table.insert(st, string.format("%q in group %q", asp.type2name, asp.type2group))
+		end
+		if asp.main then
+			table.insert(st, string.format("current %d", asp.main))
+		end
+		if asp.main ~= 0 then
+			if asp.dst then
+				table.insert(st, string.format("next %d", asp.dst))
+			end
+			if asp.proceed_as_main then
+				table.insert(st, "proceed as main")
+			end
+		end
+		return string.format("[%s]", table.concat(st, ", "))
+	end,
+}
+
 local get_aspect
 
 local supposed_aspects = {}
@@ -11,6 +32,9 @@ local supposed_aspects = {}
 function I.load_supposed_aspects(tbl)
 	if tbl then
 		supposed_aspects = tbl
+		for _, v in pairs(tbl) do
+			setmetatable(v, signal_aspect_metatable)
+		end
 	end
 end
 
@@ -41,11 +65,14 @@ end
 
 local function adjust_aspect(pos, asp)
 	asp = table.copy(I.signal_convert_aspect_if_necessary(asp))
+	setmetatable(asp, signal_aspect_metatable)
 
 	local mainpos = D.get_main(pos)
 	local nxtasp
-	if asp.main ~= 0 and mainpos then
+	if mainpos then
 		nxtasp = get_aspect(mainpos)
+	end
+	if asp.main ~= 0 and mainpos then
 		asp.dst = nxtasp.main
 	else
 		asp.dst = nil
@@ -59,7 +86,10 @@ local function adjust_aspect(pos, asp)
 	if stype == 2 then
 		local group = suppasp.group
 		local name
-		if asp.main ~= 0 and nxtasp and nxtasp.type2group == group and nxtasp.type2name then
+		if suppasp.dst_shift and nxtasp then
+			asp.main = nil
+			name = A.type1_to_type2main(nxtasp, group, suppasp.dst_shift)
+		elseif asp.main ~= 0 and nxtasp and nxtasp.type2group == group and nxtasp.type2name then
 			name = A.get_type2_dst(group, nxtasp.type2name)
 		else
 			name = A.type1_to_type2main(asp, group)
@@ -79,7 +109,7 @@ local function get_real_aspect(pos)
 		local asp = ndef.advtrains.get_aspect(pos, node) or I.DANGER
 		local suppasp = get_supported_aspects(pos)
 		if suppasp.type == 2 then
-			asp = A.type2main_to_type1(suppasp.group, asp)
+			asp = A.type2_to_type1(suppasp, asp)
 		end
 		return adjust_aspect(pos, asp)
 	end
@@ -108,11 +138,6 @@ local function set_aspect(pos, asp, skipdst)
 		if (not skipdst) and aspect_changed then
 			D.update_main(pos)
 		end
-		--[[
-		local dbgmsg = string.format("[%s]set_aspect(%s,%s,%s)", os.clock(), minetest.pos_to_string(pos), minetest.serialize(asp), tostring(skipdst))
-		dbgmsg = debug.traceback(dbgmsg, 2)
-		minetest.chat_send_all(dbgmsg)
-		--]]
 	end
 end
 

advtrains_interlocking/signal_aspect_ui.lua

@@ -219,7 +219,7 @@ local function get_aspect_from_formspec_t1(suppasp, fields)
 end
 
 local function get_aspect_from_formspec_t2(suppasp, fields)
-	local asp = advtrains.interlocking.aspects.type2main_to_type1(suppasp.group, tonumber(fields.asp))
+	local asp = advtrains.interlocking.aspects.type2_to_type1(suppasp, tonumber(fields.asp))
 	return asp
 end
 

advtrains_interlocking/signal_aspects.lua

@@ -67,7 +67,9 @@ local function get_type2_dst(group, name)
 	return def.main[math.max(1, aspidx-1)].name
 end
 
-local function type2main_to_type1(name, asp)
+local function type2_to_type1(suppasp, asp)
+	local name = suppasp.group
+	local shift = suppasp.dst_shift
 	local def = type2defs[name]
 	if not def then
 		return nil
@@ -78,18 +80,26 @@ local function type2main_to_type1(name, asp)
 	else
 		aspidx = def.main[asp] or 2
 	end
-	local asptbl = def.main[aspidx]
+	local realidx = math.min(#def.main, aspidx+(shift or 0))
+	local asptbl = def.main[realidx]
 	if not asptbl then
 		return nil
 	end
 	if type(asp) == "number" then
 		asp = asptbl.name
 	end
-	local dst = def.main[math.min(#def.main, aspidx+1)].main
+	local main, shunt, dst
+	if shift then
+		dst = asptbl.main
+	else
+		main = asptbl.main
+		shunt = asptbl.shunt
+		dst = def.main[math.min(#def.main, aspidx+1)].main
+	end
 
 	local t = {
-		main = asptbl.main,
-		shunt = asptbl.shunt,
+		main = main,
+		shunt = shunt,
 		proceed_as_main = asptbl.proceed_as_main,
 		type2name = asp,
 		type2group = name,
@@ -101,31 +111,28 @@ local function type2main_to_type1(name, asp)
 	return t
 end
 
-local function type1_to_type2main(asp, group)
+local function type1_to_type2main(asp, group, shift)
 	local def = type2defs[group]
 	if not def then
 		return nil
 	end
-	if group == asp.type2group and def.main[asp.type2name] then
-		return asp.type2name
-	end
 	local t_main = def.main
 	local idx
-	if not asp.main or asp.main == -1 then
+	if group == asp.type2group and t_main[asp.type2name] then
+		idx = t_main[asp.type2name]
+	elseif not asp.main or asp.main == -1 then
 		idx = 1
 	elseif asp.main == 0 then
 		idx = #t_main
 	else
-		idx = math.max(#t_main-1, 1)
+		idx = #t_main-1
 	end
-	return t_main[idx].name
+	return t_main[math.max(1, idx-(shift or 0))].name
 end
 
 local function equalp(asp1, asp2)
 	if asp1 == asp2 then -- same reference
 		return true
-	elseif asp1.type2group and asp1.type2group == asp2.type2group then -- type2 with the same group
-		return asp1.type2name == asp2.type2name
 	else
 		for _, k in pairs {"main", "shunt", "dst"} do
 			if asp1[k] ~= asp2[k] then
@@ -133,6 +140,9 @@ local function equalp(asp1, asp2)
 			end
 		end
 	end
+	if asp1.type2group and asp1.type2group == asp2.type2group then
+		return asp1.type2name == asp2.type2name
+	end
 	return true
 end
 
@@ -144,7 +154,7 @@ return {
 	register_type2 = register_type2,
 	get_type2_definition = get_type2_definition,
 	get_type2_dst = get_type2_dst,
-	type2main_to_type1 = type2main_to_type1,
+	type2_to_type1 = type2_to_type1,
 	type1_to_type2main = type1_to_type2main,
 	equalp = equalp,
 	not_equalp = not_equalp,

advtrains_interlocking/spec/basic_signalling_spec.lua

@@ -44,7 +44,7 @@ world.layout {
 
 describe("API for supposed signal aspects", function()
 	it("should load and save data properly", function()
-		local tbl = {_foo = true}
+		local tbl = {_foo = {}}
 		I.load_supposed_aspects(tbl)
 		assert.same(tbl, I.save_supposed_aspects())
 	end)

advtrains_interlocking/tcb_ts_ui.lua

@@ -198,6 +198,7 @@ minetest.register_on_punchnode(function(pos, node, player, pointed_thing)
 			if is_signal then
 				local ndef = minetest.registered_nodes[node.name]
 				if ndef and ndef.advtrains and ndef.advtrains.set_aspect then
+					if ndef.advtrains.supported_aspects and not ndef.advtrains.supported_aspects.dst_shift then
 						local tcbs = ildb.get_tcbs(sigd)
 						if tcbs then
 							tcbs.signal = pos
@@ -213,6 +214,9 @@ minetest.register_on_punchnode(function(pos, node, player, pointed_thing)
 						else
 							minetest.chat_send_player(pname, "Configuring TCB: Internal error, TCBS doesn't exist. Aborted.")
 						end
+					else
+						minetest.chat_send_player(pname, "Configuring TCB: Cannot use distant signal. Aborted.")
+					end
 				else
 					minetest.chat_send_player(pname, "Configuring TCB: Cannot use static signals for routesetting. Aborted.")
 				end

advtrains_signals_japan/init.lua

@@ -401,6 +401,7 @@ for _, rtab in ipairs {
 					supported_aspects = {
 						type = 2,
 						group = siginfo.typename,
+						dst_shift = siginfo.isdst and 0,
 					},
 					get_aspect = function()
 						return asp