mirror of
https://github.com/sbrl/Minetest-WorldEditAdditions.git
synced 2024-12-23 12:05:01 +00:00
16 lines
909 B
Lua
16 lines
909 B
Lua
|
|
--- Parses a chance value, and returns the 1-in-N value thereof.
|
|
-- @param str string The string to parse.
|
|
-- @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).
|
|
-- @returns number|nil The 1-in-N chance if parsing was successful, otherwise nil.
|
|
function worldeditadditions.parse.chance(str, mode)
|
|
if not mode then mode = "1-in-n" end
|
|
if tonumber(str) ~= nil then return tonumber(str) end
|
|
if str:sub(#str) == "%" then
|
|
local result = tonumber(str:sub(1, #str-1))
|
|
if not result then return nil end
|
|
if mode == "weight" then result = 100 - result end
|
|
return 1 / (result / 100) -- Convert percentage to 1-in-N chance
|
|
end
|
|
return nil
|
|
end
|