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Add special value support to math.tostring

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This commit is contained in:
Lars Mueller 2021-08-16 20:07:23 +02:00
parent 9ced0f6d5c
commit 27e91df7dd
1 changed files with 12 additions and 1 deletions
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13
math.lua
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@ -2,6 +2,8 @@
local math, math_floor, minetest, modlib_table_reverse, os, string_char, table, table_insert, table_concat
= math, math.floor, minetest, modlib.table.reverse, os, string.char, table, table.insert, table.concat
local inf = math.huge
-- Set environment
local _ENV = {}
setfenv(1, _ENV)
@ -30,6 +32,15 @@ default_precision = 10
-- See https://github.com/appgurueu/Luon/blob/master/index.js#L724
function tostring(number, base, digit_function, precision)
if number ~= number then
return "nan"
end
if number == inf then
return "inf"
end
if number == -inf then
return "-inf"
end
digit_function = digit_function or default_digit_function
precision = precision or default_precision
local out = {}
@ -77,7 +88,7 @@ function fround(number)
local leading = exp < -127 and 0 or 1
local mantissa = math_floor((leading - number / powexp) * 0x800000 + 0.5)
if mantissa <= -0x800000 then
return sign * math.huge
return sign * inf
end
return sign * powexp * (leading - mantissa / 0x800000)
end