prosody
25e0ec11b4e4
util/human/units.lua

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util/human/units.lua @ 10889:25e0ec11b4e4

util.human.units: Put math functions into locals Primarily because the next commit will deal with math.log behaving differently on Lua 5.1 and that's eaiser with locals.
author Kim Alvefur <zash@zash.se>
date Wed, 03 Jun 2020 20:16:00 +0200
parent 10888:42a0d9089de9
child 10890:a451f80d1cea
comparison
equal deleted inserted replaced
10888:42a0d9089de9 10889:25e0ec11b4e4
1 local math_abs = math.abs;
2 local math_ceil = math.ceil;
3 local math_floor = math.floor;
4 local math_log = math.log;
5 local math_max = math.max;
6 local math_min = math.min;
1 local unpack = table.unpack or unpack; --luacheck: ignore 113 7 local unpack = table.unpack or unpack; --luacheck: ignore 113
2 8
3 local large = { 9 local large = {
4 "k", 1000, 10 "k", 1000,
5 "M", 1000000, 11 "M", 1000000,
34 40
35 -- n: number, the number to format 41 -- n: number, the number to format
36 -- unit: string, the base unit 42 -- unit: string, the base unit
37 -- b: optional enum 'b', thousands base 43 -- b: optional enum 'b', thousands base
38 local function format(n, unit, b) --> string 44 local function format(n, unit, b) --> string
39 local round = math.floor; 45 local round = math_floor;
40 local prefixes = large; 46 local prefixes = large;
41 local logbase = 1000; 47 local logbase = 1000;
42 local fmt = "%.3g %s%s"; 48 local fmt = "%.3g %s%s";
43 if n == 0 then 49 if n == 0 then
44 return fmt:format(n, "", unit); 50 return fmt:format(n, "", unit);
46 if b == 'b' then 52 if b == 'b' then
47 prefixes = binary; 53 prefixes = binary;
48 logbase = 1024; 54 logbase = 1024;
49 elseif n < 1 then 55 elseif n < 1 then
50 prefixes = small; 56 prefixes = small;
51 round = math.ceil; 57 round = math_ceil;
52 end 58 end
53 local m = math.max(0, math.min(8, round(math.abs(math.log(math.abs(n), logbase))))); 59 local m = math_max(0, math_min(8, round(math_abs(math_log(math_abs(n), logbase)))));
54 local prefix, multiplier = unpack(prefixes, m * 2-1, m*2); 60 local prefix, multiplier = unpack(prefixes, m * 2-1, m*2);
55 return fmt:format(n / (multiplier or 1), prefix or "", unit); 61 return fmt:format(n / (multiplier or 1), prefix or "", unit);
56 end 62 end
57 63
58 return { 64 return {