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|
-- Packageversion: 0.1
-- Packagedate: 2018/07/04
-- tagpdf.lua
-- Ulrike Fischer
--[[
The code has quite probably a number of problems
- more variables should be local instead of global
- the naming is not always consistent due to the development of the code
- the traversing of the shipout box must be tested with more complicated setups
- it should probably handle more node types
-
--]]
--[[
the main table is named uftag. It contains the functions and also the data
collected during the compilation.
uftag.mc will contain mc connected data.
uftag.struct will contain structure related data.
uftag.page will contain page data
uftag.tables contains also data from mc and struct (from older code). This needs cleaning up.
There are certainly dublettes, but I don't dare yet ...
uftag.func will contain (public) functions.
uftag.trace will contain tracing/loging functions.
local funktions starts with __
functions
uftag.func.get_num_from (tag): takes a tag (string) and returns the id number
uftag.func.output_num_from (tag): takes a tag (string) and prints (to tex) the id number
uftag.func.get_tag_from (num): takes a num and returns the tag
uftag.func.output_tag_from (num): takes a num and prints (to tex) the tag
uftag.func.store_mc_data (num,key,data): stores key=data in uftag.mc[num]
uftag.func.store_mc_label (label,num): stores label=num in uftag.mc.labels
uftag.func.store_mc_kid (mcnum,kid,page): stores the mc-kids of mcnum on page page
uftag.func.store_mc_in_page(mcnum,mcpagecnt,page): stores in the page table the number of mcnum on this page
uftag.func.store_struct_mcabs (structnum,mcnum): stores relations structnum<->mcnum (abs)
uftag.func.mc_insert_kids (mcnum): inserts the /K entries for mcnum by wandering throught the [kids] table
uftag.func.mark_page_elements(box,mcpagecnt,mccntprev,mcopen,name,mctypeprev) : the main function
uftag.func.mark_shipout (): a wrapper around the core function which inserts the last EMC
uftag.func.fill_parent_tree_line (page): outputs the entries of the parenttree for this page
uftag.func.output_parenttree(): outputs the content of the parenttree
uftag.trace.show_mc_data (num): shows uftag.mc[num]
uftag.trace.show_all_mc_data (max): shows a maximum about mc's
uftag.trace.show_seq: shows a sequence (array)
uftag.trace.show_struct_data (num): shows data of structure num
uftag.trace.show_prop: shows a prop
uftag.trace.log
--]]
local mctypeattributeid = luatexbase.registernumber ("g__uftag_mc_type_attr")
local mccntattributeid = luatexbase.registernumber ("g__uftag_mc_cnt_attr")
local catlatex = luatexbase.registernumber("catcodetable@latex")
local tagunmarkedbool= token.create("g__uftag_tagunmarked_bool")
local truebool = token.create("c_true_bool")
local tableinsert = table.insert
-- not all needed, copied from lua-visual-debug.
local nodeid = node.id
local nodecopy = node.copy
local nodegetattribute = node.get_attribute
local nodenew = node.new
local nodetail = node.tail
local nodeslide = node.slide
local noderemove = node.remove
local nodetraverseid = node.traverse_id
local nodeinsertafter = node.insert_after
local nodeinsertbefore = node.insert_before
local pdfpageref = pdf.pageref
local HLIST = node.id("hlist")
local VLIST = node.id("vlist")
local RULE = node.id("rule")
local DISC = node.id("disc")
local GLUE = node.id("glue")
local KERN = node.id("kern")
local PENALTY = node.id("penalty")
local LOCAL_PAR = node.id("local_par")
local MATH = node.id("math")
local function __uftag_get_mathsubtype (mathnode)
if mathnode.subtype == 0 then
subtype = "beginmath"
else
subtype = "endmath"
end
return subtype
end
uftag = uftag or { }
uftag.mc = uftag.mc or { } -- mc data
uftag.struct = uftag.struct or { } -- struct data
uftag.tables = uftag.tables or { } -- tables created with new prop and new seq.
-- wasn't a so great idea ...
uftag.page = uftag.page or { } -- page data, currently only i->{0->mcnum,1->mcnum,...}
uftag.trace = uftag.trace or { } -- show commands
uftag.func = uftag.func or { } -- functions
uftag.conf = uftag.conf or { } -- configuration variables
local __uftag_log =
function (message,loglevel)
if (loglevel or 3) <= tex.count["l__uftag_loglevel_int"] then
texio.write_nl("tagpdf: ".. message)
end
end
uftag.trace.log = __uftag_log
local __uftag_get_mc_cnt_type_tag = function (n)
local mccnt = nodegetattribute(n,mccntattributeid) or -1
local mctype = nodegetattribute(n,mctypeattributeid) or -1
local tag = uftag.func.get_tag_from(mctype)
return mccnt,mctype,tag
end
local function __uftag_insert_emc_node (head,current)
local emcnode = nodenew("whatsit","pdf_literal")
emcnode.data = "EMC"
emcnode.mode=1
head = node.insert_before(head,current,emcnode)
return head
end
local function __uftag_insert_bmc_node (head,current,tag)
local bmcnode = nodenew("whatsit","pdf_literal")
bmcnode.data = "/"..tag.." BMC"
bmcnode.mode=1
head = node.insert_before(head,current,bmcnode)
return head
end
local function __uftag_insert_bdc_node (head,current,tag,dict)
local bdcnode = nodenew("whatsit","pdf_literal")
bdcnode.data = "/"..tag.."<<"..dict..">> BDC"
bdcnode.mode=1
head = node.insert_before(head,current,bdcnode)
return head
end
--[[
Now follows the core function
It wades through the shipout box and checks the attributes
ARGUMENTS
box: is a box,
mcpagecnt: num, the current page cnt of mc (should start at -1 in shipout box), needed for recursion
mccntprev: num, the attribute cnt of the previous node/whatever - if different we have a chunk border
mcopen: num, records if some bdc/emc is open
These arguments are only needed for log messages, if not present are replaces by fix strings:
name: string to describe the box
mctypeprev: num, the type attribute of the previous node/whatever
there are lots of logging messages currently. Should be cleaned up in due course.
One should also find ways to make the function shorter.
--]]
function uftag.func.mark_page_elements (box,mcpagecnt,mccntprev,mcopen,name,mctypeprev)
local name = name or ("SOMEBOX")
local mctypeprev = mctypeprev or -1
local abspage = tex.count["g__uftag_abspage_int"] --["c@abspage"]
uftag.trace.log ("PAGE " .. abspage,3)
uftag.trace.log ("FUNC ARGS: pagecnt".. mcpagecnt.." prev "..mccntprev .. " type prev "..mctypeprev,4)
uftag.trace.log ("TRAVERSING BOX ".. tostring(name).." TYPE ".. node.type(node.getid(box)),3)
local head = box.head -- AtBeginShipoutBox is a vlist?
if head then
mccnthead, mctypehead,taghead = __uftag_get_mc_cnt_type_tag (head)
uftag.trace.log ("HEAD " .. node.type(node.getid(head)).. " MC"..tostring(mccnthead).." => TAG "..tostring(mctypehead).." => "..tostring(taghead),3)
else
uftag.trace.log ("HEAD is ".. tostring(head),3)
end
for n in node.traverse(head) do
local mccnt, mctype, tag = __uftag_get_mc_cnt_type_tag (n)
uftag.trace.log ("NODE ".. node.type(node.getid(n)).." MC"..tostring(mccnt).." => TAG "..tostring(mctype).." => " .. tostring(tag),3)
if n.id == HLIST
then -- enter the hlist
mcopen,mcpagecnt,mccntprev,mctypeprev=
uftag.func.mark_page_elements (n,mcpagecnt,mccntprev,mcopen,"INTERNAL HLIST",mctypeprev)
elseif n.id == VLIST then -- enter the vlist
mcopen,mcpagecnt,mccntprev,mctypeprev=
uftag.func.mark_page_elements (n,mcpagecnt,mccntprev,mcopen,"INTERNAL VLIST",mctypeprev)
elseif n.id == GLUE then -- glue is ignored
elseif n.id == LOCAL_PAR then -- local_par is ignored
elseif n.id == PENALTY then -- penalty is ignored
elseif n.id == KERN then -- kern is ignored
else
-- math is currently only logged.
-- we could mark the whole as math
-- for inner processing the mlist_to_hlist callback is probably needed.
if n.id == MATH then
uftag.trace.log("NODE "..node.type(node.getid(n)).." "..__uftag_get_mathsubtype(n),3)
end
-- endmath
uftag.trace.log("CURRENT "..mccnt.." PREV "..mccntprev,3)
if mccnt~=mccntprev then -- a new mc chunk
uftag.trace.log ("NODE ".. node.type(node.getid(n)).." MC"..tostring(mccnt).." <=> PREVIOUS "..tostring(mccntprev),3)
if mcopen~=0 then -- there is a chunk open, close it (hope there is only one ...
box.list=__uftag_insert_emc_node (box.list,n)
mcopen = mcopen - 1
uftag.trace.log ("INSERT EMC " .. mcpagecnt .. " MCOPEN = " .. mcopen,2)
if mcopen ~=0 then
uftag.trace.log ("!WARNING! open mc" .. " MCOPEN = " .. mcopen,1)
end
end
if uftag.mc[mccnt] then
if uftag.mc[mccnt]["artifact"] then
uftag.trace.log("THIS IS AN ARTIFACT of type "..tostring(uftag.mc[mccnt]["artifact"]),3)
if uftag.mc[mccnt]["artifact"] == "notype" then
box.list = __uftag_insert_bmc_node (box.list,n,"Artifact")
else
box.list = __uftag_insert_bdc_node (box.list,n,"Artifact", "/Type /"..uftag.mc[mccnt]["artifact"])
end
else
uftag.trace.log("THIS IS A TAG "..tostring(tag),3)
mcpagecnt = mcpagecnt +1
uftag.trace.log ("INSERT BDC "..mcpagecnt,2)
box.list = __uftag_insert_bdc_node (box.list,n,tag, "/MCID "..mcpagecnt)
uftag.func.store_mc_kid (mccnt,mcpagecnt,abspage)
uftag.func.store_mc_in_page(mccnt,mcpagecnt,abspage)
uftag.trace.show_mc_data (mccnt)
end
mcopen = mcopen + 1
else
uftag.trace.log("THIS HAS NOT BEEN TAGGED",1)
-- perhaps code that tag a artifact can be added ...
if tagunmarkedbool.mode == truebool.mode then
box.list = __uftag_insert_bmc_node (box.list,n,"Artifact")
end
mcopen = mcopen + 1
end
mccntprev = mccnt
end
end -- end if
end -- end for
if head then
mccnthead, mctypehead,taghead = __uftag_get_mc_cnt_type_tag (head)
uftag.trace.log ("ENDHEAD " .. node.type(node.getid(head)).. " MC"..tostring(mccnthead).." => TAG "..tostring(mctypehead).." => "..tostring(taghead),3)
else
uftag.trace.log ("ENDHEAD is ".. tostring(head),3)
end
uftag.trace.log ("QUITTING TRAVERSING BOX ".. tostring(name).." TYPE ".. node.type(node.getid(box)),3)
return mcopen,mcpagecnt,mccntprev,mctypeprev
end
function uftag.func.mark_shipout ()
mcopen = uftag.func.mark_page_elements (tex.box["AtBeginShipoutBox"],-1,-100,0,"Shipout",-1)
if mcopen~=0 then -- there is a chunk open, close it (hope there is only one ...
local emcnode = nodenew("whatsit","pdf_literal")
local box = tex.box["AtBeginShipoutBox"].list
emcnode.data = "EMC"
emcnode.mode=1
if box then
box = node.insert_after (box,node.tail(box),emcnode)
mcopen = mcopen - 1
uftag.trace.log ("INSERT LAST EMC, MCOPEN = " .. mcopen,2)
else
uftag.trace.log ("UPS ",1)
end
if mcopen ~=0 then
uftag.trace.log ("!WARNING! open mc" .. " MCOPEN = " .. mcopen,1)
end
end
end
function uftag.trace.show_seq (seq)
if (type(seq) == "table") then
for i,v in ipairs(seq) do
__uftag_log ("[" .. i .. "] => " .. tostring(v),1)
end
else
__uftag_log ("sequence " .. tostring(seq) .. " not found",1)
end
end
local __uftag_pairs_prop =
function (prop)
local a = {}
for n in pairs(prop) do tableinsert(a, n) end
table.sort(a)
local i = 0 -- iterator variable
local iter = function () -- iterator function
i = i + 1
if a[i] == nil then return nil
else return a[i], prop[a[i]]
end
end
return iter
end
function uftag.trace.show_prop (prop)
if (type(prop) == "table") then
for i,v in __uftag_pairs_prop (prop) do
__uftag_log ("[" .. i .. "] => " .. tostring(v),1)
end
else
__uftag_log ("prop " .. tostring(prop) .. " not found or not a table",1)
end
end
local __uftag_get_num_from =
function (tag)
if uftag.tables["g__uftag_role_tags_prop"][tag] then
a= uftag.tables["g__uftag_role_tags_prop"][tag]
else
a= -1
end
return a
end
uftag.func.get_num_from = __uftag_get_num_from
function uftag.func.output_num_from (tag)
local num = __uftag_get_num_from (tag)
tex.sprint(catlatex,num)
if num == -1 then
__uftag_log ("Unknown tag "..tag.." used")
end
end
local __uftag_get_tag_from =
function (num)
if uftag.tables["g__uftag_role_tags_seq"][num] then
a = uftag.tables["g__uftag_role_tags_seq"][num]
else
a= "UNKNOWN"
end
return a
end
uftag.func.get_tag_from = __uftag_get_tag_from
function uftag.func.output_tag_from (num)
tex.sprint(catlatex,__uftag_get_tag_from (num))
end
function uftag.func.store_mc_data (num,key,data)
uftag.mc[num] = uftag.mc[num] or { }
uftag.mc[num][key] = data
__uftag_log ("storing mc"..num..": "..tostring(key).."=>"..tostring(data))
end
function uftag.trace.show_mc_data (num)
if uftag and uftag.mc and uftag.mc[num] then
for k,v in pairs(uftag.mc[num]) do
__uftag_log ("mc"..num..": "..tostring(k).."=>"..tostring(v),3)
end
if uftag.mc[num]["kids"] then
__uftag_log ("mc" .. num .. " has " .. #uftag.mc[num]["kids"] .. " kids",3)
for k,v in ipairs(uftag.mc[num]["kids"]) do
__uftag_log ("mc ".. num .. " kid "..k.." =>" .. v.kid.." on page " ..v.page,3)
end
end
else
__uftag_log ("mc"..num.." not found",3)
end
end
function uftag.trace.show_all_mc_data (max)
for i = 1, max do
uftag.trace.show_mc_data (i)
end
end
function uftag.func.store_mc_label (label,num)
uftag.mc["labels"] = uftag.mc["labels"] or { }
uftag.mc.labels[label] = num
end
function uftag.func.store_mc_kid (mcnum,kid,page)
uftag.trace.log("MC"..mcnum.." STORING KID" .. kid.." on page " .. page,3)
uftag.mc[mcnum]["kids"] = uftag.mc[mcnum]["kids"] or { }
local kidtable = {kid=kid,page=page}
tableinsert(uftag.mc[mcnum]["kids"], kidtable )
end
function uftag.func.mc_insert_kids (mcnum)
if uftag.mc[mcnum] then
uftag.trace.log("MC-KIDS test " .. mcnum,4)
if uftag.mc[mcnum]["kids"] then
for i,kidstable in ipairs( uftag.mc[mcnum]["kids"] ) do
local kidnum = kidstable["kid"]
local kidpage = kidstable["page"]
local kidpageobjnum = pdfpageref(kidpage)
uftag.trace.log("MC" .. mcnum .. " insert KID " ..i.. " with num " .. kidnum .. " on page " .. kidpage.."/"..kidpageobjnum,3)
tex.sprint(catlatex,"<</Type /MCR /Pg "..kidpageobjnum .. " 0 R /MCID "..kidnum.. ">> " )
end
else
uftag.trace.log("WARN! MC"..mcnum.." has no kids",0)
end
else
uftag.trace.log("WARN! MC"..mcnum.." doesn't exist",0)
end
end
function uftag.func.store_struct_mcabs (structnum,mcnum)
uftag.struct[structnum]=uftag.struct[structnum] or { }
uftag.struct[structnum]["mc"]=uftag.struct[structnum]["mc"] or { }
-- a structure can contain more than on mc chunk, the content should be ordered
tableinsert(uftag.struct[structnum]["mc"],mcnum)
-- but every mc can only be in one structure
uftag.mc[mcnum]= uftag.mc[mcnum] or { }
uftag.mc[mcnum]["parent"] = structnum
end
function uftag.trace.show_struct_data (num)
if uftag and uftag.struct and uftag.struct[num] then
for k,v in ipairs(uftag.struct[num]) do
__uftag_log ("struct "..num..": "..tostring(k).."=>"..tostring(v))
end
else
__uftag_log ("struct "..num.." not found ")
end
end
-- pay attention: lua counts arrays from 1, tex pages from one
-- mcid and arrays in pdf count from 0.
function uftag.func.store_mc_in_page (mcnum,mcpagecnt,page)
uftag.page[page] = uftag.page[page] or {}
uftag.page[page][mcpagecnt] = mcnum
uftag.trace.log("PAGE " .. page .. ": inserting MCID " .. mcpagecnt .. " => " .. mcnum,3)
end
function uftag.func.fill_parent_tree_line (page)
-- we need to get page-> i=kid -> mcnum -> structnum
-- pay attention: the kid numbers and the page number in the parent tree start with 0!
local numsentry
local pdfpage = page-1
if uftag.page[page] and uftag.page[page][0] then
mcchunks=#uftag.page[page]
uftag.trace.log("PAGETREE PAGE "..page.." has "..mcchunks.."+1 Elements ",3)
for i=0,mcchunks do
uftag.trace.log("PAGETREE CHUNKS "..uftag.page[page][i],0)
end
if mcchunks == 0 then
-- only one chunk so no need for an array
local mcnum = uftag.page[page][0]
local structnum = uftag.mc[mcnum]["parent"]
local propname = "g__uftag_struct_"..structnum.."_prop"
local objnum = uftag.tables[propname]["objnum"] or "XXXX"
texio.write_nl("=====>"..tostring(objnum))
numsentry = pdfpage .. " ".. objnum .. " 0 R"
uftag.trace.log("PAGETREE PAGE" .. page.. " NUM ENTRY = ".. numsentry,3)
else
numsentry = pdfpage .. " ["
for i=0,mcchunks do
local mcnum = uftag.page[page][i]
local structnum = uftag.mc[mcnum]["parent"]
local propname = "g__uftag_struct_"..structnum.."_prop"
local objnum = uftag.tables[propname]["objnum"] or "XXXX"
numsentry = numsentry .. " ".. objnum .. " 0 R"
end
numsentry = numsentry .. "] "
uftag.trace.log("PAGETREE PAGE" .. page.. " NUM ENTRY = ".. numsentry,3)
end
else
uftag.trace.log ("PAGETREE: NO DATA FOR PAGE "..i,3)
end
return numsentry
end
function uftag.func.output_parenttree (abspage)
for i=1,abspage do
line = uftag.func.fill_parent_tree_line (i) .. "^^J"
tex.sprint(catlatex,line)
end
end
|