From 7002dfe5556f503320d9bee480e5fb43bdb6e7a3 Mon Sep 17 00:00:00 2001 From: Khaled Hosny Date: Mon, 10 May 2010 17:23:06 +0300 Subject: Rename to lualibs Rename luaextra->lualibs when sensible, also use luatexbase instead of luatextra. --- lualibs-number.lua | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 58 insertions(+) create mode 100644 lualibs-number.lua (limited to 'lualibs-number.lua') diff --git a/lualibs-number.lua b/lualibs-number.lua new file mode 100644 index 0000000..a1249f0 --- /dev/null +++ b/lualibs-number.lua @@ -0,0 +1,58 @@ +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 -- cgit v1.2.3