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https://github.com/sbrl/Minetest-WorldEditAdditions.git
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17 lines
909 B
Lua
17 lines
909 B
Lua
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--- Parses a chance value, and returns the 1-in-N value thereof.
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-- @param str string The string to parse.
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-- @param invert_percent string The operation mode. Valid modes: "1-in-n" (default), "weight". "1-in-n" refers to a 1-in-N chance of something happening (lower numbers mean greater likelihood). "weight", on the other hand, is instead a weighting that something will happen (higher numbers mean a greater likelihood).
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-- @returns number|nil The 1-in-N chance if parsing was successful, otherwise nil.
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function worldeditadditions.parse.chance(str, mode)
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if not mode then mode = "1-in-n" end
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if tonumber(str) ~= nil then return tonumber(str) end
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if str:sub(#str) == "%" then
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local result = tonumber(str:sub(1, #str-1))
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if not result then return nil end
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if mode == "weight" then result = 100 - result end
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return 1 / (result / 100) -- Convert percentage to 1-in-N chance
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end
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return nil
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end
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