advtrains.git - Advtrains mod for minetest.

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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)


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