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-- filename : l-tex.lua
-- comment : split off from luat-lib
-- author : Hans Hagen, PRAGMA-ADE, Hasselt NL
-- copyright: PRAGMA ADE / ConTeXt Development Team
-- license : see context related readme files
if not versions then versions = { } end versions['l-tex'] = 1.001
if not number then number = { } end
number.dimenfactors = {
["pt"] = 1/65536,
["in"] = ( 100/ 7227)/65536,
["cm"] = ( 254/ 7227)/65536,
["mm"] = ( 254/72270)/65536,
["sp"] = 1,
["bp"] = ( 7200/ 7227)/65536,
["pc"] = ( 1/ 12)/65536,
["dd"] = ( 1157/ 1238)/65536,
["cc"] = ( 1157/14856)/65536,
["nd"] = (20320/21681)/65536,
["nc"] = ( 5080/65043)/65536
}
function number.todimen(n,unit,fmt)
if type(n) == 'string' then
return n
else
return string.format(fmt or "%.5g%s",n*number.dimenfactors[unit or 'pt'],unit or 'pt')
end
end
function number.topoints (n) return number.todimen(n,"pt") end
function number.toinches (n) return number.todimen(n,"in") end
function number.tocentimeters (n) return number.todimen(n,"cm") end
function number.tomillimeters (n) return number.todimen(n,"mm") end
function number.toscaledpoints(n) return number.todimen(n,"sp") end
function number.toscaledpoints(n) return n .. "sp" end
function number.tobasepoints (n) return number.todimen(n,"bp") end
function number.topicas (n) return number.todimen(n "pc") end
function number.todidots (n) return number.todimen(n,"dd") end
function number.tociceros (n) return number.todimen(n,"cc") end
function number.tonewdidots (n) return number.todimen(n,"nd") end
function number.tonewciceros (n) return number.todimen(n,"nc") end
--~ for k,v in pairs{nil, "%.5f%s", "%.8g%s", "%.8f%s"} do
--~ print(number.todimen(65536))
--~ print(number.todimen( 256))
--~ print(number.todimen(65536,'pt',v))
--~ print(number.todimen( 256,'pt',v))
--~ end
-- todo: use different scratchdimen
-- todo: use parser if no tex.dimen
function string.todimen(str)
if type(str) == "number" then
return str
elseif str:find("^[%d%-%+%.]+$") then
return tonumber(str)
--~ elseif tex then
--~ tex.dimen[0] = str
--~ return tex.dimen[0] or 0
else
local n, u = str:match("([%d%-%+%.]+)(%a%a)")
if n and u then
return n/number.dimenfactors[u]
else
return 0
end
end
end
--~ print(string.todimen("10000"))
--~ print(string.todimen("10pt"))
--~ See mk.pdf for an explanation of the following code:
--~
--~ function test(n)
--~ lua.delay(function(...)
--~ tex.sprint(string.format("pi: %s %s %s\\par",...))
--~ end)
--~ lua.delay(function(...)
--~ tex.sprint(string.format("more pi: %s %s %s\\par",...))
--~ end)
--~ tex.sprint(string.format("\\setbox0=\\hbox{%s}",math.pi*n))
--~ lua.flush(tex.wd[0],tex.ht[0],tex.dp[0])
--~ end
if lua then do
delayed = { } -- could also be done with closures
function lua.delay(f)
delayed[#delayed+1] = f
end
function lua.flush_delayed(...)
local t = delayed
delayed = { }
for _, fun in ipairs(t) do
fun(...)
end
end
function lua.flush(...)
tex.sprint("\\directlua 0 {lua.flush_delayed(" .. table.concat({...},',') .. ")}")
end
end end
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