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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
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