Module:Range

Documentation for this module may be created at Module:Range/doc

local x = {}
require("mw.language")

function x.main(frame)
    local args = frame.args
    local ret = {}
    if table.getn(args) == 1 then
        local start, stop, step = 0, args[1], 1
    elseif table.getn(args) == 2 then
        local start, stop, step = args[1], args[2], 1
    elseif table.getn(args) == 3 then
        local start, stop, step = args[1], args[2], args[3]
    else
        error("Blah!")
    end
    if (step > 0 and start >= step) or (step < 0 and start <= step) then
        return "[]"
    end
    repeat
        -- Because Lua has idiosyncratic list/array syntax that starts at 1 rather than 0...
        ret[start + 1] = tostring(start)
        start = start + 1
    until start >= stop
    ret = "[" .. table.concat(ret, ", ") .. "]"
    return ret
end

return x