if not modules then modules = { } end modules ['syst-con'] = {
    version   = 1.001,
    comment   = "companion to syst-con.mkiv",
    author    = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
    copyright = "PRAGMA ADE / ConTeXt Development Team",
    license   = "see context related readme files"
}

local tonumber = tonumber
local utfchar = utf.char
local gsub, format = string.gsub, string.format

converters       = converters or { }
local converters = converters

local context    = context
local comands    = commands

local formatters = string,formatters

--[[ldx--
<p>For raw 8 bit characters, the offset is 0x110000 (bottom of plane 18) at
the top of <l n='luatex'/>'s char range but outside the unicode range.</p>
--ldx]]--

function converters.hexstringtonumber(n) tonumber(n,16) end
function converters.octstringtonumber(n) tonumber(n, 8) end

function converters.rawcharacter     (n) utfchar(0x110000+n) end

converters.lchexnumber  = formatters["%x"  ]
converters.uchexnumber  = formatters["%X"  ]
converters.lchexnumbers = formatters["%02x"]
converters.uchexnumbers = formatters["%02X"]
converters.octnumber    = formatters["%03o"]

function commands.hexstringtonumber(n) context(tonumber(n,16)) end
function commands.octstringtonumber(n) context(tonumber(n, 8)) end

function commands.rawcharacter     (n) context(utfchar(0x110000+n)) end

function commands.lchexnumber      (n) context("%x"  ,n) end
function commands.uchexnumber      (n) context("%X"  ,n) end
function commands.lchexnumbers     (n) context("%02x",n) end
function commands.uchexnumbers     (n) context("%02X",n) end
function commands.octnumber        (n) context("%03o",n) end

function commands.format(fmt,...) -- used ?
    fmt = gsub(fmt,"@","%%")
    context(fmt,...)
end

local cosd, sind, tand = math.cosd, math.sind, math.tand
local cos, sin, tan = math.cos, math.sin, math.tan

-- unfortunately %s spits out: 6.1230317691119e-017
--
-- function commands.sind(n) context(sind(n)) end
-- function commands.cosd(n) context(cosd(n)) end
-- function commands.tand(n) context(tand(n)) end
--
-- function commands.sin (n) context(sin (n)) end
-- function commands.cos (n) context(cos (n)) end
-- function commands.tan (n) context(tan (n)) end

function commands.sind(n) context("%0.6F",sind(n)) end
function commands.cosd(n) context("%0.6F",cosd(n)) end
function commands.tand(n) context("%0.6F",tand(n)) end

function commands.sin (n) context("%0.6F",sin (n)) end
function commands.cos (n) context("%0.6F",cos (n)) end
function commands.tan (n) context("%0.6F",tan (n)) end