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-- ars.lua
-- automatic routesetting
--[[
The "ARS table" and its effects:
Every route has (or can have) an associated ARS table. This can either be
ars = { [n] = {ln="<line>"}/{rc="<routingcode>"}/{c="<a comment>"} }
a list of rules involving either line or routingcode matchers (or comments, those are ignored)
The first matching rule determines the route to set.
- or -
ars = {default = true}
this means that all trains that no other rule matches on should use this route
Compound ("and") conjunctions are not supported (--TODO should they?)
For editing, those tables are transformed into lines in a text area:
{ln=...} -> LN ...
{rc=...} -> RC ...
{c=...} -> #...
{default=true} -> *
See also route_ui.lua
]]
local il = advtrains.interlocking
-- The ARS data are saved in a table format, but are entered in text format. Utility functions to transform between both.
function il.ars_to_text(arstab)
if not arstab then
return ""
end
local txt = {}
for i, arsent in ipairs(arstab) do
local n = ""
if arsent.n then
n = "!"
end
if arsent.ln then
txt[#txt+1] = n.."LN "..arsent.ln
elseif arsent.rc then
txt[#txt+1] = n.."RC "..arsent.rc
elseif arsent.c then
txt[#txt+1] = "#"..arsent.c
end
end
if arstab.default then
return "*\n" .. table.concat(txt, "\n")
end
return table.concat(txt, "\n")
end
function il.text_to_ars(t)
if t=="" then
return nil
elseif t=="*" then
return {default=true}
end
local arstab = {}
for line in string.gmatch(t, "[^\r\n]+") do
if line=="*" then
arstab.default = true
else
local c, v = string.match(line, "^(...?)%s(.*)$")
if c and v then
local n = nil
if string.sub(c,1,1) == "!" then
n = true
c = string.sub(c,2)
end
local tt=string.upper(c)
if tt=="LN" then
arstab[#arstab+1] = {ln=v, n=n}
elseif tt=="RC" then
arstab[#arstab+1] = {rc=v, n=n}
end
else
local ct = string.match(line, "^#(.*)$")
if ct then arstab[#arstab+1] = {c = ct} end
end
end
end
return arstab
end
local function find_rtematch(routes, train)
local default
for rteid, route in ipairs(routes) do
if route.ars then
if route.ars.default then
default = rteid
else
if il.ars_check_rule_match(route.ars, train) then
return rteid
end
end
end
end
return default
end
-- Checks whether ARS rule explicitly matches. This does not take into account the "default" field, since a wider context is required for this.
-- Returns the rule number that matched, or nil if nothing matched
function il.ars_check_rule_match(ars, train)
if not ars then
return nil
end
local line = train.line
local routingcode = train.routingcode
for arskey, arsent in ipairs(ars) do
--atdebug(arsent, line, routingcode)
if arsent.n then
-- rule is inverse...
if arsent.ln and (not line or arsent.ln ~= line) then
return arskey
elseif arsent.rc and (not routingcode or not string.find(" "..routingcode.." ", " "..arsent.rc.." ", nil, true)) then
return arskey
end
return nil
end
if arsent.ln and line and arsent.ln == line then
return arskey
elseif arsent.rc and routingcode and string.find(" "..routingcode.." ", " "..arsent.rc.." ", nil, true) then
return arskey
end
end
return nil
end
function advtrains.interlocking.ars_check(signalpos, train, trig_from_dst)
-- check for distant signal
-- this whole check must be delayed until after the route setting has taken place,
-- because before that the distant signal is yet unknown
if not trig_from_dst then
minetest.after(0.5, function()
-- does signal have dst?
local _, remote = il.signal.get_aspect(signalpos)
if remote then
advtrains.interlocking.ars_check(remote, train, true)
end
end)
end
local sigd = il.db.get_sigd_for_signal(signalpos)
local tcbs = sigd and il.db.get_tcbs(sigd)
-- trigger ARS on this signal
if tcbs and tcbs.routes then
if tcbs.ars_disabled or tcbs.ars_ignore_next then
-- No-ARS mode of signal.
-- ignore...
-- Note: ars_ignore_next is set by signalling formspec when route is cancelled
tcbs.ars_ignore_next = nil
return
end
if trig_from_dst and tcbs.no_dst_ars_trig then
-- signal not to be triggered from distant
return
end
if tcbs.routeset then
-- ARS is not in effect when a route is already set
-- just "punch" routesetting, just in case callback got lost.
minetest.after(0, il.route.update_route, sigd, tcbs, nil, nil)
return
end
local rteid = find_rtematch(tcbs.routes, train)
if rteid then
--delay routesetting, it should not occur inside train step
-- using after here is OK because that gets called on every path recalculation
minetest.after(0, il.route.update_route, sigd, tcbs, rteid, nil)
end
end
end
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