diff options
Diffstat (limited to 'Master/texmf-dist/tex/context/base/mkiv/node-ref.lua')
| -rw-r--r-- | Master/texmf-dist/tex/context/base/mkiv/node-ref.lua | 941 |
1 files changed, 941 insertions, 0 deletions
diff --git a/Master/texmf-dist/tex/context/base/mkiv/node-ref.lua b/Master/texmf-dist/tex/context/base/mkiv/node-ref.lua new file mode 100644 index 00000000000..9f2d0918c0f --- /dev/null +++ b/Master/texmf-dist/tex/context/base/mkiv/node-ref.lua @@ -0,0 +1,941 @@ +if not modules then modules = { } end modules ['node-ref'] = { + version = 1.001, + comment = "companion to node-ref.mkiv", + author = "Hans Hagen, PRAGMA-ADE, Hasselt NL", + copyright = "PRAGMA ADE / ConTeXt Development Team", + license = "see context related readme files" +} + +-- We supported pdf right from the start and in mkii this has resulted in +-- extensive control over the links. Nowadays pdftex provides a lot more +-- control over margins but as mkii supports multiple backends we stuck to +-- our own mechanisms. In mkiv again we implement our own handling. Eventually +-- we will even disable the pdf primitives. + +-- helper, will end up in luatex + +-- is grouplevel still used? + +local concat = table.concat + +local attributes, nodes, node = attributes, nodes, node + +local allocate = utilities.storage.allocate, utilities.storage.mark +local mark = utilities.storage.allocate, utilities.storage.mark + +local nodeinjections = backends.nodeinjections +local codeinjections = backends.codeinjections + +local cleanupreferences = false +local cleanupdestinations = true + +local transparencies = attributes.transparencies +local colors = attributes.colors +local references = structures.references +local tasks = nodes.tasks + +local trace_references = false trackers.register("nodes.references", function(v) trace_references = v end) +local trace_destinations = false trackers.register("nodes.destinations", function(v) trace_destinations = v end) +local trace_areas = false trackers.register("nodes.areas", function(v) trace_areas = v end) +local show_references = false trackers.register("nodes.references.show", function(v) show_references = tonumber(v) or (v and 2.25 or false) end) +local show_destinations = false trackers.register("nodes.destinations.show", function(v) show_destinations = tonumber(v) or (v and 2.00 or false) end) + +local report_reference = logs.reporter("backend","references") +local report_destination = logs.reporter("backend","destinations") +local report_area = logs.reporter("backend","areas") + +local nuts = nodes.nuts +local nodepool = nuts.pool + +local tonode = nuts.tonode +local tonut = nuts.tonut + +local getfield = nuts.getfield +local setfield = nuts.setfield +local setlink = nuts.setlink +local setnext = nuts.setnext +local setprev = nuts.setprev +local getnext = nuts.getnext +local getprev = nuts.getprev +local getid = nuts.getid +local getlist = nuts.getlist +local setlist = nuts.setlist +local getattr = nuts.getattr +local setattr = nuts.setattr +local getsubtype = nuts.getsubtype + +local hpack_list = nuts.hpack +local vpack_list = nuts.vpack +local list_dimensions = nuts.dimensions +local traverse = nuts.traverse +local find_node_tail = nuts.tail + +local nodecodes = nodes.nodecodes +local skipcodes = nodes.skipcodes +local listcodes = nodes.listcodes + +local hlist_code = nodecodes.hlist +local vlist_code = nodecodes.vlist +local glue_code = nodecodes.glue +local glyph_code = nodecodes.glyph +local rule_code = nodecodes.rule +local dir_code = nodecodes.dir +local localpar_code = nodecodes.localpar + +local leftskip_code = skipcodes.leftskip +local rightskip_code = skipcodes.rightskip +local parfillskip_code = skipcodes.parfillskip + +local line_code = listcodes.line + +local new_rule = nodepool.rule +local new_kern = nodepool.kern + +local free_node = nuts.free + +local tosequence = nodes.tosequence + +local implement = interfaces.implement + +-- Normally a (destination) area is a box or a simple stretch if nodes but when it is +-- a paragraph we have a problem: we cannot calculate the height well. This happens +-- with footnotes or content broken across a page. + +local function hlist_dimensions(start,stop,parent) + local last = stop and getnext(stop) + if parent then + return list_dimensions(getfield(parent,"glue_set"),getfield(parent,"glue_sign"),getfield(parent,"glue_order"),start,last) + else + return list_dimensions(start,last) + end +end + +local function vlist_dimensions(start,stop) -- also needs the stretch and so + local temp + if stop then + temp = getnext(stop) + setnext(stop,nil) + end + local v = vpack_list(start) + local w = getfield(v,"width") + local h = getfield(v,"height") + local d = getfield(v,"depth") + setlist(v) -- not needed + free_node(v) + if temp then + setnext(stop,temp) + end + return w, h, d +end + +local function dimensions(parent,start,stop) -- in principle we could move some to the caller + local id = getid(start) + if start == stop then + if id == hlist_code or id == vlist_code or id == glyph_code or id == rule_code then + if trace_areas then + report_area("dimensions taken of %a",nodecodes[id]) + end + -- hm, parent can be zero + local width = getfield(start,"width") + local height = getfield(parent,"height") + local depth = getfield(parent,"depth") + if height == 0 and depth == 0 then + height = getfield(start,"height") + depth = getfield(start,"depth") + end + return width, height, depth + else + if trace_areas then + report_area("dimensions calculated of %a",nodecodes[id]) + end + return hlist_dimensions(start,stop) -- one node only so simple + end + end + local last = stop and getnext(stop) + if parent then + -- todo: if no prev and no next and parent + -- todo: we need a a list_dimensions for a vlist + if getid(parent) == vlist_code then + if false then + local l = getlist(parent) + local c = l + local ok = false + while c do + if c == start then + ok = true + end + if ok and getid(c) == hlist_code then + break + else + c = getnext(c) + end + end + if ok and c then + if trace_areas then + report_area("dimensions taken of first line in vlist") + end + return getfield(c,"width"), getfield(c,"height"), getfield(c,"depth"), c + else + if trace_areas then + report_area("dimensions taken of vlist (probably wrong)") + end + return hlist_dimensions(start,stop,parent) + end + else + -- + -- we can as well calculate here because we only have kerns and glue + -- + local first = nil + local last = nil + local current = start + local noflines = 0 + while current do + local id = getid(current) + if id == hlist_code or id == vlist_code or id == rule_code then + if noflines == 0 then + first = current + noflines = 1 + else + noflines = noflines + 1 + end + last = current + end + if current == stop then + break + else + current = getnext(current) + end + end + if noflines > 1 then + if trace_areas then + report_area("dimensions taken of vlist") + end + local w, h, d = vlist_dimensions(first,last,parent) + local ht = getfield(first,"height") + return w, ht, d + h - ht, first + else + -- return hlist_dimensions(start,stop,parent) + if first then + if trace_areas then + report_area("dimensions taken of first line in vlist") + end + return getfield(first,"width"), getfield(first,"height"), getfield(first,"depth"), first + else + if trace_areas then + report_area("dimensions taken of vlist (probably wrong)") + end + return hlist_dimensions(start,stop,parent) + end + end + end + else + if trace_areas then + report_area("dimensions taken of range starting with %a using parent",nodecodes[id]) + end + return hlist_dimensions(start,stop,parent) + end + else + if trace_areas then + report_area("dimensions taken of range starting with %a",nodecodes[id]) + end + return hlist_dimensions(start,stop) + end +end + +-- is pardir important at all? + +local function inject_range(head,first,last,reference,make,stack,parent,pardir,txtdir) + local width, height, depth, line = dimensions(parent,first,last) + if txtdir == "+TRT" or (txtdir == "===" and pardir == "TRT") then -- KH: textdir == "===" test added + width = - width + end + local result, resolved = make(width,height,depth,reference) + if result and resolved then + if line then + -- special case, we only treat the first line in a vlist + local l = getlist(line) + if trace_areas then + report_area("%s: %i : %s %s %s => w=%p, h=%p, d=%p, c=%S","line", + reference,pardir or "---",txtdir or "---", + tosequence(l,nil,true),width,height,depth,resolved) + end + setlist(line,result) + setlink(result,l) + return head, last + else + if head == first then + if trace_areas then + report_area("%s: %i : %s %s %s => w=%p, h=%p, d=%p, c=%S","head", + reference,pardir or "---",txtdir or "---", + tosequence(first,last,true),width,height,depth,resolved) + end + setlink(result,first) + return result, last + else + if trace_areas then + report_area("%s: %i : %s %s %s => w=%p, h=%p, d=%p, c=%S","middle", + reference,pardir or "---",txtdir or "---", + tosequence(first,last,true),width,height,depth,resolved) + end + local prev = getprev(first) + if prev then + setlink(prev,result) + end + setlink(result,first) + return head, last + end + end + else + return head, last + end +end + +local function inject_list(id,current,reference,make,stack,pardir,txtdir) + local width = getfield(current,"width") + local height = getfield(current,"height") + local depth = getfield(current,"depth") + local correction = 0 + local moveright = false + local first = getlist(current) + if id == hlist_code then -- box_code line_code + -- can be either an explicit hbox or a line and there is no way + -- to recognize this; anyway only if ht/dp (then inline) + local sr = stack[reference] + if first then + if sr and sr[2] then + local last = find_node_tail(first) + if getid(last) == glue_code and getsubtype(last) == rightskip_code then + local prev = getprev(last) + moveright = getid(first) == glue_code and getsubtype(first) == leftskip_code + if prev and getid(prev) == glue_code and getsubtype(prev) == parfillskip_code then + width = dimensions(current,first,getprev(prev)) -- maybe not current as we already take care of it + else + if moveright then + width = width - getfield(first,"stretch") * getfield(current,"glue_set") * getfield(current,"glue_sign") + end + width = width - getfield(last,"stretch") * getfield(current,"glue_set") * getfield(current,"glue_sign") + end + end + else + -- also weird + end + else + -- ok + end + correction = width + else + correction = height + depth + height, depth = depth, height -- ugly hack, needed because pdftex backend does something funny + end + if pardir == "TRT" then + width = - width + end + local result, resolved = make(width,height,depth,reference) + -- todo: only when width is ok + if result and resolved then + if trace_areas then + report_area("%s: %04i %s %s %s: w=%p, h=%p, d=%p, c=%S","box", + reference,pardir or "---",txtdir or "----","[]",width,height,depth,resolved) + end + if not first then + setlist(current,result) + elseif moveright then -- brr no prevs done + -- result after first + local n = getnext(first) + setnext(result,n) + setlink(first,first) + if n then + setprev(n,result) + end + else + -- first after result + setlink(result,first) + setlist(current,result) + end + end +end + +-- skip is somewhat messy + +-- todo: when line we can look at the next line + +-- see dimensions: this is tricky with split off boxes like inserts +-- where we can end up with a first and last spanning lines so maybe +-- we need to do vlists differently + +local function inject_areas(head,attribute,make,stack,done,skip,parent,pardir,txtdir) -- main + if head then + local current, first, last, firstdir, reference = head, nil, nil, nil, nil + pardir = pardir or "===" + txtdir = txtdir or "===" + while current do + local id = getid(current) + if id == hlist_code or id == vlist_code then + local r = getattr(current,attribute) + -- test \goto{test}[page(2)] test \gotobox{test}[page(2)] + -- test \goto{\TeX}[page(2)] test \gotobox{\hbox {x} \hbox {x}}[page(2)] + -- if r and (not skip or r >) skip then -- maybe no > test + -- inject_list(id,current,r,make,stack,pardir,txtdir) + -- end + if r then + if not reference then + reference, first, last, firstdir = r, current, current, txtdir + elseif r == reference then + -- same link + last = current + elseif (done[reference] or 0) == 0 then + if not skip or r > skip then -- maybe no > test + head, current = inject_range(head,first,last,reference,make,stack,parent,pardir,firstdir) + reference, first, last, firstdir = nil, nil, nil, nil + end + else + reference, first, last, firstdir = r, current, current, txtdir + end + done[r] = (done[r] or 0) + 1 + end + local list = getlist(current) + if list then + local h, ok + h, ok , pardir, txtdir = inject_areas(list,attribute,make,stack,done,r or skip or 0,current,pardir,txtdir) + if h ~= current then + setlist(current,h) + end + end + if r then + done[r] = done[r] - 1 + end + elseif id == dir_code then + txtdir = getfield(current,"dir") + elseif id == localpar_code then + pardir = getfield(current,"dir") + elseif id == glue_code and getsubtype(current) == leftskip_code then -- any glue at the left? + -- + else + local r = getattr(current,attribute) + if not r then + -- just go on, can be kerns + elseif not reference then + reference, first, last, firstdir = r, current, current, txtdir + elseif r == reference then + last = current + elseif (done[reference] or 0) == 0 then -- or id == glue_code and getsubtype(current) == right_skip_code + if not skip or r > skip then -- maybe no > test + head, current = inject_range(head,first,last,reference,make,stack,parent,pardir,firstdir) + reference, first, last, firstdir = nil, nil, nil, nil + end + else + reference, first, last, firstdir = r, current, current, txtdir + end + end + current = getnext(current) + end + if reference and (done[reference] or 0) == 0 then + head = inject_range(head,first,last,reference,make,stack,parent,pardir,firstdir) + end + end + return head, true, pardir, txtdir +end + +local function inject_area(head,attribute,make,stack,done,parent,pardir,txtdir) -- singular ! + if head then + pardir = pardir or "===" + txtdir = txtdir or "===" + local current = head + while current do + local id = getid(current) + if id == hlist_code or id == vlist_code then + local r = getattr(current,attribute) + if r and not done[r] then + done[r] = true + inject_list(id,current,r,make,stack,pardir,txtdir) + end + local list = getlist(current) + if list then + local h = inject_area(list,attribute,make,stack,done,current,pardir,txtdir) + if h ~= current then + setlist(current,h) + end + end + elseif id == dir_code then + txtdir = getfield(current,"dir") + elseif id == localpar_code then + pardir = getfield(current,"dir") + else + local r = getattr(current,attribute) + if r and not done[r] then + done[r] = true + head, current = inject_range(head,current,current,r,make,stack,parent,pardir,txtdir) + end + end + current = getnext(current) + end + end + return head, true +end + +-- tracing: todo: use predefined colors + +local register_color = colors.register + +local a_color = attributes.private('color') +local a_colormodel = attributes.private('colormodel') +local a_transparency = attributes.private('transparency') +local u_transparency = nil +local u_colors = { } +local force_gray = true + +local function addstring(what,str,shift) --todo make a pluggable helper (in font-ctx) + if str then + local typesetters = nuts.typesetters + if typesetters then + local hashes = fonts.hashes + local infofont = fonts.infofont() + local emwidth = hashes.emwidths [infofont] + local exheight = hashes.exheights[infofont] + if what == "reference" then + str = str .. " " + shift = - (shift or 2.25) * exheight + else + str = str .. " " + shift = (shift or 2) * exheight + end + local text = typesetters.tohpack(str,infofont) + local rule = new_rule(emwidth/5,4*exheight,3*exheight) + setfield(text,"shift",shift) + return hpack_list(nuts.linked(text,rule)) + end + end +end + +local function colorize(width,height,depth,n,reference,what,sr,offset) + if force_gray then n = 0 end + u_transparency = u_transparency or transparencies.register(nil,2,.65) + local ucolor = u_colors[n] + if not ucolor then + if n == 1 then + u_color = register_color(nil,'rgb',.75,0,0) + elseif n == 2 then + u_color = register_color(nil,'rgb',0,.75,0) + elseif n == 3 then + u_color = register_color(nil,'rgb',0,0,.75) + else + n = 0 + u_color = register_color(nil,'gray',.5) + end + u_colors[n] = u_color + end + if width == 0 then + -- probably a strut as placeholder + report_area("%s %s has no %s dimensions, width %p, height %p, depth %p",what,reference,"horizontal",width,height,depth) + width = 65536 + end + if height + depth <= 0 then + report_area("%s %s has no %s dimensions, width %p, height %p, depth %p",what,reference,"vertical",width,height,depth) + height = 65536/2 + depth = height + end + local rule = new_rule(width,height,depth) -- todo: use tracer rule + setattr(rule,a_colormodel,1) -- gray color model + setattr(rule,a_color,u_color) + setattr(rule,a_transparency,u_transparency) + if width < 0 then + local kern = new_kern(width) + setfield(rule,"width",-width) + setnext(kern,rule) + setprev(rule,kern) + return kern + else + +if sr and sr ~= "" then + local text = addstring(what,sr,shift) + if text then + local kern = new_kern(-getfield(text,"width")) + setlink(kern,text) + setlink(text,rule) + return kern + end +end + + return rule + end +end + +local function justadd(what,sr,shift) + if sr and sr ~= "" then + local text = addstring(what,sr,shift) + if text then + local kern = new_kern(-getfield(text,"width")) + setlink(kern,text) + setlink(text,rule) + return kern + end + end +end + +-- references: + +local texsetattribute = tex.setattribute +local texsetcount = tex.setcount + +local stack = { } +local done = { } +local attribute = attributes.private('reference') +local nofreferences = 0 +local topofstack = 0 + +nodes.references = { + attribute = attribute, + stack = stack, + done = done, +} + +-- todo: get rid of n (n is just a number, can be used for tracing, obsolete) + +local function setreference(h,d,r) + topofstack = topofstack + 1 + -- the preroll permits us to determine samepage (but delayed also has some advantages) + -- so some part of the backend work is already done here + stack[topofstack] = { r, h, d, codeinjections.prerollreference(r) } + -- texsetattribute(attribute,topofstack) -- todo -> at tex end + texsetcount("lastreferenceattribute",topofstack) +end + +function references.get(n) -- not public so functionality can change + local sn = stack[n] + return sn and sn[1] +end + +local function makereference(width,height,depth,reference) -- height and depth are of parent + local sr = stack[reference] + if sr then + if trace_references then + report_reference("resolving attribute %a",reference) + end + local resolved, ht, dp, set, n = sr[1], sr[2], sr[3], sr[4], sr[5] + -- logs.report("temp","child: ht=%p dp=%p, parent: ht=%p dp=%p",ht,dp,height,depth) + if ht then + if height < ht then height = ht end + if depth < dp then depth = dp end + end + -- logs.report("temp","used: ht=%p dp=%p",height,depth) + local annot = nodeinjections.reference(width,height,depth,set) + if annot then + annot = tonut(annot) -- todo + nofreferences = nofreferences + 1 + local result, current, texts + if show_references then + local d = sr[1] + if d then + local r = d.reference + local p = d.prefix + if r then + if p then + texts = p .. "|" .. r + else + texts = r + end + else + -- t[#t+1] = d.internal or "?" + end + end + end + if trace_references then + local step = 65536 + result = hpack_list(colorize(width,height-step,depth-step,2,reference,"reference",texts,show_references)) -- step subtracted so that we can see seperate links + setfield(result,"width",0) + current = result + elseif texts then + texts = justadd("reference",texts,show_references) + if texts then + result = hpack_list(texts) + setfield(result,"width",0) + current = result + end + end + if current then + setlink(current,annot) + else + result = annot + end + references.registerpage(n) + result = hpack_list(result,0) + setfield(result,"width",0) + setfield(result,"height",0) + setfield(result,"depth",0) + if cleanupreferences then stack[reference] = nil end + return result, resolved + elseif trace_references then + report_reference("unable to resolve annotation %a",reference) + end + elseif trace_references then + report_reference("unable to resolve attribute %a",reference) + end +end + +-- function nodes.references.handler(head) +-- if topofstack > 0 then +-- return inject_areas(head,attribute,makereference,stack,done) +-- else +-- return head, false +-- end +-- end + +function nodes.references.handler(head) + if topofstack > 0 then + head = tonut(head) + local head, done = inject_areas(head,attribute,makereference,stack,done) + return tonode(head), done + else + return head, false + end +end + +-- destinations (we can clean up once set, unless tagging!) + +local stack = { } +local done = { } +local attribute = attributes.private('destination') +local nofdestinations = 0 +local topofstack = 0 + +nodes.destinations = { + attribute = attribute, + stack = stack, + done = done, +} + +local function setdestination(n,h,d,name,view) -- n = grouplevel, name == table + topofstack = topofstack + 1 + stack[topofstack] = { n, h, d, name, view } + return topofstack +end + +local function makedestination(width,height,depth,reference) + local sr = stack[reference] + if sr then + if trace_destinations then + report_destination("resolving attribute %a",reference) + end + local resolved, ht, dp, name, view = sr[1], sr[2], sr[3], sr[4], sr[5] -- sr[4] will change to just internal + if ht then + if height < ht then height = ht end + if depth < dp then depth = dp end + end + local result, current, texts + if show_destinations then + if name and #name > 0 then + local t = { } + for i=1,#name do + local s = name[i] + if type(s) == "number" then + local d = references.internals[s] + if d then + d = d.references + local r = d.reference + local p = d.usedprefix + if r then + if p then + t[#t+1] = p .. "|" .. r + else + t[#t+1] = r + end + else + -- t[#t+1] = d.internal or "?" + end + end + else + -- in fact we have a prefix:name here + end + end + if #t > 0 then + texts = concat(t," & ") + end + end + end + if trace_destinations then + local step = 0 + if width == 0 then + step = 4*65536 + width, height, depth = 5*step, 5*step, 0 + end + local rule = hpack_list(colorize(width,height,depth,3,reference,"destination",texts,show_destinations)) + setfield(rule,"width",0) + if not result then + result, current = rule, rule + else + setlink(current,rule) + current = rule + end + width, height = width - step, height - step + elseif texts then + texts = justadd("destination",texts,show_destinations) + if texts then + result = hpack_list(texts) + if result then + setfield(result,"width",0) + current = result + end + end + end + nofdestinations = nofdestinations + 1 + local annot = nodeinjections.destination(width,height,depth,name,view) + if annot then + annot = tonut(annot) -- obsolete soon + if result then + setlink(current,annot) + else + result = annot + end + current = find_node_tail(annot) + end + if result then + -- some internal error + result = hpack_list(result,0) + setfield(result,"width",0) + setfield(result,"height",0) + setfield(result,"depth",0) + end + if cleanupdestinations then stack[reference] = nil end + return result, resolved + elseif trace_destinations then + report_destination("unable to resolve attribute %a",reference) + end +end + +-- function nodes.destinations.handler(head) +-- if topofstack > 0 then +-- return inject_area(head,attribute,makedestination,stack,done) -- singular +-- else +-- return head, false +-- end +-- end + +function nodes.destinations.handler(head) + if topofstack > 0 then + head = tonut(head) + local head, done = inject_areas(head,attribute,makedestination,stack,done) + return tonode(head), done + else + return head, false + end +end + + +-- will move + +function references.mark(reference,h,d,view) + return setdestination(tex.currentgrouplevel,h,d,reference,view) +end + +function references.inject(prefix,reference,specification) -- todo: use currentreference is possible + local set, bug = references.identify(prefix,reference) + if bug or #set == 0 then + -- unknown ref, just don't set it and issue an error + else + set.highlight = specification.highlight + set.newwindow = specification.newwindow + set.layer = specification.layer + setreference(specification.height,specification.depth,set) -- sets attribute / todo: for set[*].error + end +end + +-- function references.injectinternal(internal,specification) +-- references.inject("","internal("..internal..")",specification) +-- if bug or #set == 0 then +-- -- unknown ref, just don't set it and issue an error +-- else +-- -- nil prefix when "" +-- -- check +-- set.highlight = specification.highlight +-- set.newwindow = specification.newwindow +-- set.layer = specification.layer +-- setreference(specification.height,specification.depth,set) -- sets attribute / todo: for set[*].error +-- end +-- end + +function references.injectcurrentset(h,d) -- used inside doifelse + local currentset = references.currentset + if currentset then + setreference(h,d,currentset) -- sets attribute / todo: for set[*].error + end +end + +implement { + name = "injectreference", + actions = references.inject, + arguments = { + "string", + "string", + { + { "highlight", "boolean" }, + { "newwindow", "boolean" }, + { "layer" }, + { "height", "dimen" }, + { "depth", "dimen" }, + { "view" }, + } + } +} + +-- implement { +-- name = "injectinternalreference", +-- actions = references.injectinternal, +-- arguments = { +-- "integer", +-- { +-- { "highlight", "boolean" }, +-- { "newwindow", "boolean" }, +-- { "layer" }, +-- { "height", "dimen" }, +-- { "depth", "dimen" }, +-- { "view" }, +-- } +-- } +-- } + +implement { + name = "injectcurrentreference", + actions = references.injectcurrentset, +} + +implement { + name = "injectcurrentreferencehtdp", + actions = references.injectcurrentset, + arguments = { "dimen", "dimen" }, +} + +-- + +local function checkboth(open,close) + if open and open ~= "" then + local set, bug = references.identify("",open) + open = not bug and #set > 0 and set + end + if close and close ~= "" then + local set, bug = references.identify("",close) + close = not bug and #set > 0 and set + end + return open, close +end + +-- end temp hack + +statistics.register("interactive elements", function() + if nofreferences > 0 or nofdestinations > 0 then + return string.format("%s references, %s destinations",nofreferences,nofdestinations) + else + return nil + end +end) + +function references.enableinteraction() + tasks.enableaction("shipouts","nodes.references.handler") + tasks.enableaction("shipouts","nodes.destinations.handler") + function references.enableinteraction() end +end + +implement { + name = "enableinteraction", + actions = references.enableinteraction, + onlyonce = true +} |