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number.lua cleanup, tostring fixes

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This commit is contained in:
Lars Mueller 2020-12-19 14:41:03 +01:00
parent 0579840908
commit 3a5b436e11
1 changed files with 41 additions and 40 deletions
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21
number.lua
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@ -1,22 +1,23 @@
-- Make random random
math.randomseed(minetest.get_us_time())
for i = 1, 100 do
math.random()
end
-- Number helpers
function round(number, steps) -- Rounds a number
for _ = 1, 100 do math.random() end
function round(number, steps)
steps = steps or 1
return math.floor(number * steps + 0.5) / steps
end
local c0 = ("0"):byte()
local cA = ("A"):byte()
function default_digit_function(digit)
if digit <= 9 then
return string.char(c0+digit)
end
if digit <= 9 then return string.char(c0 + digit) end
return string.char(cA + digit - 10)
end
default_precision = 10
-- See https://github.com/appgurueu/Luon/blob/master/index.js#L724
function tostring(number, base, digit_function, precision)
digit_function = digit_function or default_digit_function
precision = precision or default_precision
@ -25,6 +26,7 @@ function tostring(number, base, digit_function, precision)
table.insert(out, "-")
number = -number
end
number = number + base ^ -precision / 2
local digit
while number >= base do
digit = math.floor(number % base)
@ -35,9 +37,8 @@ function tostring(number, base, digit_function, precision)
table.insert(out, digit_function(digit))
modlib.table.reverse(out)
number = number % 1
if number >= math.pow(base, precision) then
if number ~= 0 and number >= base ^ -precision then
table.insert(out, ".")
-- precision >= 0 eventually redundant
while precision >= 0 and number >= math.pow(base, precision) do
number = number * base
digit = math.floor(number % base)