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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"
}
-- See l-number.lua for the more generic (also 5.2) versions of the
-- functions below ... that file evolved over time.
local tonumber = tonumber
local format = string.format
local concat = table.concat
local floor = math.floor
number = number or { }
local number = number
-- print(number.tobitstring(8))
-- print(number.tobitstring(14))
-- print(number.tobitstring(66))
-- print(number.tobitstring(0x00))
-- print(number.tobitstring(0xFF))
-- print(number.tobitstring(46260767936,4))
local t = {
"0", "0", "0", "0", "0", "0", "0", "0",
"0", "0", "0", "0", "0", "0", "0", "0",
"0", "0", "0", "0", "0", "0", "0", "0",
"0", "0", "0", "0", "0", "0", "0", "0",
}
function number.tobitstring(b,m,w)
if not w then
w = 32
end
local n = w
for i=0,w-1 do
local v = (b>>i) & 0x1 -- bextract(b,i)
local k = w - i
if v == 1 then
n = k
t[k] = "1"
else
t[k] = "0"
end
end
if w then
return concat(t,"",1,w)
elseif m then
m = 33 - m * 8
if m < 1 then
m = 1
end
return concat(t,"",1,m)
elseif n < 8 then
return concat(t)
elseif n < 16 then
return concat(t,"",9)
elseif n < 24 then
return concat(t,"",17)
else
return concat(t,"",25)
end
end
function number.valid(str,default)
return tonumber(str) or default or nil
end
function number.toevenhex(n)
local s = format("%X",n)
if #s % 2 == 0 then
return s
else
return "0" .. s
end
end
function number.bytetodecimal(b)
local d = floor(b * 100 / 255 + 0.5)
if d > 100 then
return 100
elseif d < -100 then
return -100
else
return d
end
end
function number.decimaltobyte(d)
local b = floor(d * 255 / 100 + 0.5)
if b > 255 then
return 255
elseif b < -255 then
return -255
else
return b
end
end
function number.idiv(i,d)
return i // d
end
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