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util/human/units.lua @ 10888:42a0d9089de9
util.human.units: Handle location of unpack() in Lua 5.1
author | Kim Alvefur <zash@zash.se> |
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date | Wed, 03 Jun 2020 19:46:17 +0200 |
parent | 10886:994c4a333199 |
child | 10889:25e0ec11b4e4 |
rev | line source |
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util.human.units: Handle location of unpack() in Lua 5.1
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1 local unpack = table.unpack or unpack; --luacheck: ignore 113 |
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2 |
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3 local large = { |
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4 "k", 1000, |
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5 "M", 1000000, |
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6 "G", 1000000000, |
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7 "T", 1000000000000, |
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8 "P", 1000000000000000, |
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9 "E", 1000000000000000000, |
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10 "Z", 1000000000000000000000, |
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11 "Y", 1000000000000000000000000, |
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12 } |
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13 local small = { |
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14 "m", 0.001, |
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15 "μ", 0.000001, |
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16 "n", 0.000000001, |
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17 "p", 0.000000000001, |
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18 "f", 0.000000000000001, |
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19 "a", 0.000000000000000001, |
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20 "z", 0.000000000000000000001, |
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21 "y", 0.000000000000000000000001, |
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22 } |
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23 |
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24 local binary = { |
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25 "Ki", 2^10, |
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26 "Mi", 2^20, |
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27 "Gi", 2^30, |
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28 "Ti", 2^40, |
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29 "Pi", 2^50, |
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30 "Ei", 2^60, |
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31 "Zi", 2^70, |
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32 "Yi", 2^80, |
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33 } |
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34 |
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35 -- n: number, the number to format |
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36 -- unit: string, the base unit |
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37 -- b: optional enum 'b', thousands base |
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38 local function format(n, unit, b) --> string |
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39 local round = math.floor; |
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40 local prefixes = large; |
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41 local logbase = 1000; |
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42 local fmt = "%.3g %s%s"; |
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43 if n == 0 then |
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44 return fmt:format(n, "", unit); |
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45 end |
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46 if b == 'b' then |
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47 prefixes = binary; |
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48 logbase = 1024; |
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49 elseif n < 1 then |
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50 prefixes = small; |
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51 round = math.ceil; |
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52 end |
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53 local m = math.max(0, math.min(8, round(math.abs(math.log(math.abs(n), logbase))))); |
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54 local prefix, multiplier = unpack(prefixes, m * 2-1, m*2); |
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55 return fmt:format(n / (multiplier or 1), prefix or "", unit); |
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56 end |
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57 |
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58 return { |
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59 format = format; |
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60 }; |