73 lines
1.3 KiB
Lua
73 lines
1.3 KiB
Lua
--[[
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Signs Bot
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=========
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Copyright (C) 2019-2021 Joachim Stolberg
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GPL v3
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See LICENSE.txt for more information
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Signs Bot: Random Series
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]]--
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-- generate a table of unique pseudo random numbers
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local function gen_serie(inv_size)
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local tbl = {}
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local offs = inv_size/2
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if offs % 2 == 1 then
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offs = offs + 1
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end
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local index = 1
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for n = 1, (inv_size*2) do
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tbl[#tbl + 1] = index
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index = ((index + offs) % inv_size) + 1
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end
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return tbl
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end
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-- Pseudo numbers series to iterate "randomly" through inventories
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local InvRandomSeries = {}
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local function get_serie(inv_size)
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if not InvRandomSeries[inv_size] then
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InvRandomSeries[inv_size] = gen_serie(inv_size)
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end
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return InvRandomSeries[inv_size]
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end
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local function random(inv_size)
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local t = get_serie(inv_size)
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local i = 0
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local n = #t/2
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local offs = math.random(n)
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return function ()
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i = i + 1
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if i <= n then return t[i+offs] end
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end
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end
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--
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-- API
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--
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-- func signs_bot.random(inv_size)
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-- random iterator providing 'inv_size' possible bot inventory stack numbers
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-- inv_size must be even and between 4 and 64
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signs_bot.random = random
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--
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-- Test
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--
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--for size = 4,64,2 do
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-- local tbl = {}
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-- for idx in random(size) do
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-- tbl[#tbl + 1] = idx
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-- end
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-- print(table.concat(tbl, ", "))
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--end
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