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local _ENV = mkmodule('plugins.sort')

local utils = require('utils')

local units = require('plugins.sort.units')

local items = require('plugins.sort.items')

orders = orders or {}

orders.units = units.orders

orders.items = items.orders

function parse_ordering_spec(type,...)

local group = orders[type]

if group == nil then

dfhack.printerr('Invalid ordering class: '..tostring(type))

return nil

end

local specs = table.pack(...)

local rv = { }

for _,spec in ipairs(specs) do

local nil_first = false

if string.sub(spec,1,1) == '<' then

nil_first = true

spec = string.sub(spec,2)

end

local reverse = false

if string.sub(spec,1,1) == '>' then

reverse = true

spec = string.sub(spec,2)

end

local cm = group[spec]

if cm == nil then

dfhack.printerr('Unknown order for '..type..': '..tostring(spec))

return nil

end

if nil_first or reverse then

cm = copyall(cm)

cm.nil_first = nil_first

cm.reverse = reverse

end

rv[#rv+1] = cm

end

return rv

end

make_sort_order = utils.make_sort_order

return _ENV