/usr/share/texlive/texmf-dist/tex/luatex/lualibs/lualibs-number.lua is in texlive-luatex 2012.20120611-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 | if not modules then modules = { } end modules ['l-number'] = {
version = 1.001,
comment = "companion to luat-lib.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local tostring = tostring
local format, floor, insert, match = string.format, math.floor, table.insert, string.match
local lpegmatch = lpeg.match
number = number or { }
-- a,b,c,d,e,f = number.toset(100101)
function number.toset(n)
return match(tostring(n),"(.?)(.?)(.?)(.?)(.?)(.?)(.?)(.?)")
end
function number.toevenhex(n)
local s = format("%X",n)
if #s % 2 == 0 then
return s
else
return "0" .. s
end
end
-- the lpeg way is slower on 8 digits, but faster on 4 digits, some 7.5%
-- on
--
-- for i=1,1000000 do
-- local a,b,c,d,e,f,g,h = number.toset(12345678)
-- local a,b,c,d = number.toset(1234)
-- local a,b,c = number.toset(123)
-- end
--
-- of course dedicated "(.)(.)(.)(.)" matches are even faster
local one = lpeg.C(1-lpeg.S(''))^1
function number.toset(n)
return lpegmatch(one,tostring(n))
end
function number.bits(n,zero)
local t, i = { }, (zero and 0) or 1
while n > 0 do
local m = n % 2
if m > 0 then
insert(t,1,i)
end
n = floor(n/2)
i = i + 1
end
return t
end
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