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if not modules then modules = { } end modules ['back-pdf'] = {
version = 1.001,
comment = "companion to back-pdf.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- we could do \pdfmatrix sx <> sy <> etc
local sind, cosd = math.sind, math.cosd
local insert, remove = table.insert, table.remove
local codeinjections = backends.pdf.codeinjections
local context = context
local scanners = tokens.scanners
local scannumber = scanners.number
local scankeyword = scanners.keyword
local scandimen = scanners.dimen
local scancount = scanners.count
local scanstring = scanners.string
local scanners = interfaces.scanners
local implement = interfaces.implement
local report = logs.reporter("backend")
local outputfilename
function codeinjections.getoutputfilename()
if not outputfilename then
outputfilename = file.addsuffix(tex.jobname,"pdf")
end
return outputfilename
end
backends.install("pdf")
local f_matrix = string.formatters["%F %F %F %F"] -- 0.8 is default
scanners.pdfrotation = function() -- a
-- todo: check for 1 and 0 and flush sparse
local a = scannumber()
local s, c = sind(a), cosd(a)
context(f_matrix(c,s,-s,c))
end
-- experimental code (somewhat weird here) .. todo: nodeinjections .. this will only work
-- out well if we also calculate the accumulated cm and wrap inclusions / annotations in
-- the accumulated ... it's a mess
--
-- we could also do the save restore wrapping here + colorhack
local pdfsave = nodes.pool.pdfsave
local pdfrestore = nodes.pool.pdfrestore
local pdfsetmatrix = nodes.pool.pdfsetmatrix
local stack = { }
local restore = true -- false
scanners.pdfstartrotation = function()
local a = scannumber()
if a == 0 then
insert(stack,false)
else
local s, c = sind(a), cosd(a)
context(pdfsave())
context(pdfsetmatrix(c,s,-s,c))
insert(stack,restore and { c, -s, s, c } or true)
end
end
scanners.pdfstartscaling = function() -- at the tex end we use sx and sy instead of rx and ry
local rx, ry = 1, 1
while true do
if scankeyword("rx") then
rx = scannumber()
elseif scankeyword("ry") then
ry = scannumber()
-- elseif scankeyword("revert") then
-- local top = stack[#stack]
-- if top then
-- rx = top[1]
-- ry = top[4]
-- else
-- rx = 1
-- ry = 1
-- end
else
break
end
end
if rx == 1 and ry == 1 then
insert(stack,false)
else
if rx == 0 then
rx = 0.0001
end
if ry == 0 then
ry = 0.0001
end
context(pdfsave())
context(pdfsetmatrix(rx,0,0,ry))
insert(stack,restore and { 1/rx, 0, 0, 1/ry } or true)
end
end
scanners.pdfstartmatrix = function() -- rx sx sy ry -- tx, ty
local rx, sx, sy, ry = 1, 0, 0, 1
while true do
if scankeyword("rx") then rx = scannumber()
elseif scankeyword("ry") then ry = scannumber()
elseif scankeyword("sx") then sx = scannumber()
elseif scankeyword("sy") then sy = scannumber()
else break end
end
if rx == 1 and sx == 0 and sy == 0 and ry == 1 then
insert(stack,false)
else
context(pdfsave())
context(pdfsetmatrix(rx,sx,sy,ry))
insert(stack,store and { -rx, -sx, -sy, -ry } or true)
end
end
local function pdfstopsomething()
local top = remove(stack)
if top == false then
-- not wrapped
elseif top == true then
context(pdfrestore())
elseif top then
context(pdfsetmatrix(unpack(top))) -- not really needed anymore
context(pdfrestore())
else
-- nesting error
end
end
scanners.pdfstoprotation = pdfstopsomething
scanners.pdfstopscaling = pdfstopsomething
scanners.pdfstopmatrix = pdfstopsomething
scanners.pdfstartmirroring = function()
context(pdfsetmatrix(-1,0,0,1))
end
if environment.arguments.nocompression then
lpdf.setcompression(0,0,true)
end
scanners.pdfstopmirroring = scanners.pdfstartmirroring
-- todo, change the above to implement too --
implement {
name = "setmapfile",
arguments = "string",
actions = pdf.mapfile
}
implement {
name = "setmapline",
arguments = "string",
actions = pdf.mapline
}
implement {
name = "setpdfcompression",
arguments = { "integer", "integer" },
actions = lpdf.setcompression,
}
local report = logs.reporter("backend","pdftex primitives")
local trace = false
scanners.pdfannot = function()
if scankeyword("reserveobjectnum") then
report("\\pdfannot reserveobjectnum is not (yet) supported")
-- if trace then
-- report()
-- report("\\pdfannot: reserved number (not supported yet)")
-- report()
-- end
else
local width = false
local height = false
local depth = false
local data = false
local object = false
local attr = false
--
if scankeyword("useobjnum") then
object = scancount()
report("\\pdfannot useobjectnum is not (yet) supported")
end
while true do
if scankeyword("width") then
width = scandimen()
elseif scankeyword("height") then
height = scandimen()
elseif scankeyword("depth") then
depth = scandimen()
else
break
end
end
if scankeyword("attr") then
attr = scanstring()
end
data = scanstring()
--
-- less strict variant:
--
-- while true do
-- if scankeyword("width") then
-- width = scandimen()
-- elseif scankeyword("height") then
-- height = scandimen()
-- elseif scankeyword("depth") then
-- depth = scandimen()
-- elseif scankeyword("useobjnum") then
-- object = scancount()
-- elseif scankeyword("attr") then
-- attr = scanstring()
-- else
-- data = scanstring()
-- break
-- end
-- end
--
-- if trace then
-- report()
-- report("\\pdfannot:")
-- report()
-- report(" object: %s",object or "<unset> (not supported yet)")
-- report(" width : %p",width or "<unset>")
-- report(" height: %p",height or "<unset>")
-- report(" depth : %p",depth or "<unset>")
-- report(" attr : %s",attr or "<unset>")
-- report(" data : %s",data or "<unset>")
-- report()
-- end
context(backends.nodeinjections.annotation(width or 0,height or 0,depth or 0,data or ""))
end
end
scanners.pdfdest = function()
local name = false
local zoom = false
local view = false
local width = false
local height = false
local depth = false
if scankeyword("num") then
report("\\pdfdest num is not (yet) supported")
elseif scankeyword("name") then
name = scanstring()
end
if scankeyword("xyz") then
view = "xyz"
if scankeyword("zoom") then
report("\\pdfdest zoom is ignored")
zoom = scancount() -- will be divided by 1000 in the backend
end
elseif scankeyword("fitbh") then
view = "fitbh"
elseif scankeyword("fitbv") then
view = "fitbv"
elseif scankeyword("fitb") then
view = "fitb"
elseif scankeyword("fith") then
view = "fith"
elseif scankeyword("fitv") then
view = "fitv"
elseif scankeyword("fitr") then
view = "fitr"
while true do
if scankeyword("width") then
width = scandimen()
elseif scankeyword("height") then
height = scandimen()
elseif scankeyword("depth") then
depth = scandimen()
else
break
end
end
elseif scankeyword("fit") then
view = "fit"
end
-- if trace then
-- report()
-- report("\\pdfdest:")
-- report()
-- report(" name : %s",name or "<unset>")
-- report(" view : %s",view or "<unset>")
-- report(" zoom : %s",zoom or "<unset> (not supported)")
-- report(" width : %p",width or "<unset>")
-- report(" height: %p",height or "<unset>")
-- report(" depth : %p",depth or "<unset>")
-- report()
-- end
context(backends.nodeinjections.destination(width or 0,height or 0,depth or 0,{ name or "" },view or "fit"))
end
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