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
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
10889
25e0ec11b4e4 util.human.units: Put math functions into locals
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1 local math_abs = math.abs;
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2 local math_ceil = math.ceil;
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3 local math_floor = math.floor;
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4 local math_log = math.log;
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5 local math_max = math.max;
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6 local math_min = math.min;
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7 local unpack = table.unpack or unpack; --luacheck: ignore 113
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8
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9 local large = {
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10 "k", 1000,
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11 "M", 1000000,
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12 "G", 1000000000,
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13 "T", 1000000000000,
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14 "P", 1000000000000000,
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15 "E", 1000000000000000000,
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16 "Z", 1000000000000000000000,
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17 "Y", 1000000000000000000000000,
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18 }
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19 local small = {
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20 "m", 0.001,
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21 "μ", 0.000001,
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22 "n", 0.000000001,
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23 "p", 0.000000000001,
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24 "f", 0.000000000000001,
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25 "a", 0.000000000000000001,
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26 "z", 0.000000000000000000001,
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27 "y", 0.000000000000000000000001,
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28 }
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29
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30 local binary = {
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31 "Ki", 2^10,
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32 "Mi", 2^20,
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33 "Gi", 2^30,
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34 "Ti", 2^40,
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35 "Pi", 2^50,
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36 "Ei", 2^60,
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37 "Zi", 2^70,
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38 "Yi", 2^80,
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39 }
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40
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41 -- n: number, the number to format
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42 -- unit: string, the base unit
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43 -- b: optional enum 'b', thousands base
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44 local function format(n, unit, b) --> string
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45 local round = math_floor;
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46 local prefixes = large;
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47 local logbase = 1000;
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48 local fmt = "%.3g %s%s";
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49 if n == 0 then
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50 return fmt:format(n, "", unit);
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51 end
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52 if b == 'b' then
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53 prefixes = binary;
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54 logbase = 1024;
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55 elseif n < 1 then
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56 prefixes = small;
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57 round = math_ceil;
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58 end
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59 local m = math_max(0, math_min(8, round(math_abs(math_log(math_abs(n), logbase)))));
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60 local prefix, multiplier = unpack(prefixes, m * 2-1, m*2);
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61 return fmt:format(n / (multiplier or 1), prefix or "", unit);
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62 end
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63
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64 return {
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65 format = format;
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66 };