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-rw-r--r--Master/texmf-dist/tex/context/base/mkxl/node-ref.lmt831
1 files changed, 831 insertions, 0 deletions
diff --git a/Master/texmf-dist/tex/context/base/mkxl/node-ref.lmt b/Master/texmf-dist/tex/context/base/mkxl/node-ref.lmt
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index 00000000000..c02a37dd107
--- /dev/null
+++ b/Master/texmf-dist/tex/context/base/mkxl/node-ref.lmt
@@ -0,0 +1,831 @@
+if not modules then modules = { } end modules ['node-ref'] = {
+ version = 1.001,
+ optimize = true,
+ 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 tonumber = tonumber
+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 enableaction = nodes.tasks.enableaction
+
+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 texsetcount = tex.setcount
+----- texsetattribute = tex.setattribute
+
+local nuts = nodes.nuts
+local nodepool = nuts.pool
+
+local tonode = nuts.tonode
+local tonut = nuts.tonut
+
+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 getwidth = nuts.getwidth
+local setwidth = nuts.setwidth
+local getheight = nuts.getheight
+local getattr = nuts.getattr
+local setattr = nuts.setattr
+local getsubtype = nuts.getsubtype
+local getwhd = nuts.getwhd
+local getdirection = nuts.getdirection
+local setshift = nuts.setshift
+local getboxglue = nuts.getboxglue
+
+local hpack_list = nuts.hpack
+local vpack_list = nuts.vpack
+local getdimensions = nuts.dimensions
+local getrangedimensions = nuts.rangedimensions
+local traverse = nuts.traverse
+local find_node_tail = nuts.tail
+local start_of_par = nuts.start_of_par
+
+local nodecodes = nodes.nodecodes
+local gluecodes = nodes.gluecodes
+local listcodes = nodes.listcodes
+
+local dirvalues = nodes.dirvalues
+local lefttoright_code = dirvalues.lefttoright
+local righttoleft_code = dirvalues.righttoleft
+
+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 par_code = nodecodes.par
+
+local leftskip_code = gluecodes.leftskip
+local rightskip_code = gluecodes.rightskip
+local parfillleftskip_code = gluecodes.parfillleftskip
+local parfillskip_code = gluecodes.parfillskip
+
+----- linelist_code = listcodes.line
+
+local new_rule = nodepool.rule
+local new_kern = nodepool.kern
+local new_hlist = nodepool.hlist
+
+local flush_node = nuts.flush
+
+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.
+
+-- skip is somewhat messy
+-- when we have a line line we can look at the next line and make a shape
+-- 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
+-- no need for dir here if we inject in the right spot as then we can
+-- pick up the dir elsewhere (in lmtx)
+
+local inject_areas do
+
+ local function hlist_dimensions(start,stop,parent)
+ local last = stop and getnext(stop)
+ if parent then
+ return getrangedimensions(parent,start,last)
+ else
+ return getdimensions(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) -- use helper but happens seldom anyway so ...
+ local w, h, d = getwhd(v)
+ setlist(v) -- not needed
+ flush_node(v)
+ if temp then
+ setnext(stop,temp)
+ end
+ return w, h, d
+ end
+
+ -- not ok when vlist at mvl level
+
+ local function dimensions(parent,start,stop) -- in principle we could move some to the caller
+ if start == stop then
+ local id = getid(start)
+ if id == hlist_code or id == vlist_code or id == rule_code or id == glyph_code then
+ local sw, sh, sd = getwhd(start)
+ local pw, ph, pd = getwhd(parent)
+ local ht = sh == 0 and ph or sh -- changed
+ local dp = sd == 0 and pd or sd -- changed
+ if trace_areas then
+ report_area("dimensions taken of %a (%p,%p,%p) with parent (%p,%p,%p) -> (%p,%p,%p)",
+ nodecodes[id],sw,sh,sd,pw,ph,pd,sw,ht,dp)
+ end
+ return sw, ht, dp
+ 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
+ elseif 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
+ --
+ -- we can as well calculate here because we only have kerns and glue
+ --
+ local last = stop and getnext(stop)
+ local first = nil
+ local last = nil
+ local current = start
+ local noflines = 0
+ while current do -- can be loop
+ 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 = getheight(first)
+ return w, ht, d + h - ht, first
+ elseif first then
+ if trace_areas then
+ report_area("dimensions taken of first line in vlist")
+ end
+ local w, h, d = getwhd(first)
+ return w, h, d, first
+ else
+ if trace_areas then
+ report_area("dimensions taken of vlist (probably wrong)")
+ end
+ return hlist_dimensions(start,stop,parent)
+ end
+ else
+ if trace_areas then
+ report_area("dimensions taken of range starting with %a using parent",nodecodes[getid(start)])
+ end
+ return hlist_dimensions(start,stop,parent)
+ end
+ else
+ if trace_areas then
+ report_area("dimensions taken of range starting with %a",nodecodes[getid(start)])
+ end
+ return hlist_dimensions(start,stop)
+ end
+ end
+
+ -- Setting these once and not passign them each nested call is faster and this injector is
+ -- actually one of the more costly calls in a run (when we have lots of references to
+ -- check) and it's also a bti less code.
+
+ local attribute, make, stack, done
+
+ local function inject_range(head,first,last,reference,parent,pardir,txtdir)
+ local width, height, depth, line = dimensions(parent,first,last)
+ if txtdir == righttoleft_code then
+ width = - width
+ elseif txtdir == lefttoright_code then
+ -- go on
+ elseif pardir == righttoleft_code then
+ 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","line",
+ reference,pardir or "?",txtdir or "?",
+ tosequence(l,nil,true),width,height,depth)
+ end
+ setlist(line,result)
+ setlink(result,l)
+ return head, last
+ elseif head == first then
+ if trace_areas then
+ report_area("%s: %i : %s %s %s => w=%p, h=%p, d=%p","head",
+ reference,pardir or "?",txtdir or "?",
+ tosequence(first,last,true),width,height,depth)
+ 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","middle",
+ reference,pardir or "?",txtdir or "?",
+ tosequence(first,last,true),width,height,depth)
+ end
+ if first == last and getid(parent) == vlist_code and getid(first) == hlist_code then
+ if trace_areas then
+ -- think of a button without \dontleavehmode in the mvl
+ report_area("compensating for link in vlist")
+ end
+ setlink(result,getlist(first))
+ setlist(first,result)
+ else
+ setlink(getprev(first),result,first)
+ end
+ return head, last
+ end
+ else
+ return head, last
+ end
+ end
+
+ -- Somehow this one no longer got used. See node-ref.lua for the implementation.
+ --
+ -- local function inject_list(id,current,reference,pardir,txtdir)
+ -- end
+
+ local function inject(head,skip,parent,pardir,txtdir)
+ local first, last, firstdir, reference
+ local current = head
+ 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 then
+ if not reference then
+ reference = r
+ first = current
+ last = current
+ firstdir = 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,parent,pardir,firstdir)
+ reference = nil
+ first = nil
+ last = nil
+ firstdir = nil
+ end
+ else
+ reference = r
+ first = current
+ last = current
+ firstdir = txtdir
+ end
+ done[r] = (done[r] or 0) + 1
+ end
+ local list = getlist(current)
+ if list then
+ local h
+ h, pardir, txtdir = inject(list,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
+ goto NEXT
+ elseif id == dir_code then
+ local direction, pop = getdirection(current)
+ txtdir = not pop and direction -- we might need a stack
+ goto NEXT
+ elseif id == par_code then
+ if start_of_par(current) then
+ pardir = getdirection(current)
+ end
+ goto NEXT
+ elseif id == glue_code then
+ local subtype = getsubtype(current)
+ if subtype == leftskip_code or subtype == parfillleftskip_code then
+ goto NEXT
+ elseif subtype == rightskip_code or subtype == parfillskip_code then
+ if reference and (done[reference] or 0) == 0 then
+ head, current = inject_range(head,first,last,reference,parent,pardir,firstdir)
+ reference = nil
+ first = nil
+ last = nil
+ firstdir = nil
+ end
+ goto NEXT
+ end
+ end
+ do
+ local r = getattr(current,attribute)
+ if not r then
+ -- just go on, can be kerns
+ elseif not reference then
+ reference = r
+ first = current
+ last = current
+ firstdir = txtdir
+ elseif r == reference then
+ last = current
+ elseif (done[reference] or 0) == 0 then -- or (id == glue_code and getsubtype(current) == right_skip_code) then
+ if not skip or r > skip then -- maybe no > test
+ head, current = inject_range(head,first,last,reference,parent,pardir,firstdir)
+ reference = nil
+ first = nil
+ last = nil
+ firstdir = nil
+ else
+-- print("!!!!!!!!")
+ end
+ else
+ -- todo: safeguard when we have a glyph or dics or ... so we might as well
+ -- then scan for all possibel content nodes
+ reference = r
+ first = current
+ last = current
+ firstdir = txtdir
+ end
+ end
+ ::NEXT::
+ current = getnext(current)
+ end
+ if reference and (done[reference] or 0) == 0 then
+ head = inject_range(head,first,last,reference,parent,pardir,firstdir)
+ end
+ return head, pardir, txtdir
+ end
+
+ inject_areas = function(head,a,m,s,d)
+ attribute = a
+ make = m
+ stack = s
+ done = d
+ return (inject(head))
+ end
+
+end
+
+-- tracing: todo: use predefined colors
+
+local colorize, justadd do
+
+ local u_transparency = nil
+ local u_colors = { }
+ local force_gray = true
+
+ local register_color = colors.register
+
+ local setcoloring = nuts.colors.set
+
+ 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)
+ setshift(text,shift)
+ return hpack_list(setlink(text,rule))
+ end
+ end
+ end
+
+ colorize = function(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 = setcoloring(new_rule(width,height,depth),1,u_color,u_transparency) -- gray color model
+ if width < 0 then
+ local kern = new_kern(width)
+ setwidth(rule,-width)
+ setnext(kern,rule)
+ setprev(rule,kern)
+ return kern
+ elseif sr and sr ~= "" then
+ local text = addstring(what,sr,shift)
+ if text then
+ local kern = new_kern(-getwidth(text))
+ setlink(kern,text,rule)
+ return kern
+ end
+ end
+ return rule
+ end
+
+ justadd = function(what,sr,shift,current) -- needs testing
+ if sr and sr ~= "" then
+ local text = addstring(what,sr,shift)
+ if text then
+ local kern = new_kern(-getwidth(text))
+ setlink(kern,text,current)
+ return new_hlist(kern)
+ end
+ end
+ end
+
+end
+
+local nofreferences = 0
+
+do
+
+ local stack = { }
+ local done = { }
+ local attribute = attributes.private('reference')
+ 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) -- h and d can be nil
+ 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 or false, d or false, 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 = sr[1]
+ local ht = sr[2]
+ local dp = sr[3]
+ local set = sr[4]
+ local n = 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,resolved.mesh)
+ if annot then
+ annot = tonut(annot) -- todo
+ nofreferences = nofreferences + 1
+ local result, current, texts
+ if show_references then
+ local d = resolved
+ 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 = new_hlist(colorize(width,height-step,depth-step,2,reference,"reference",texts,show_references)) -- step subtracted so that we can see seperate links
+ current = result
+ elseif texts then
+ texts = justadd("reference",texts,show_references,current)
+ if texts then
+ current = texts
+ end
+ end
+ if current then
+ setlink(current,annot)
+ else
+ result = annot
+ end
+ references.registerpage(n)
+ result = new_hlist(result)
+ 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 head and topofstack > 0 then
+ return inject_areas(head,attribute,makereference,stack,done)
+ else
+ return head
+ end
+ 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
+
+end
+
+local nofdestinations = 0
+
+do
+
+ local stack = { }
+ local done = { }
+ local attribute = attributes.private('destination')
+ 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 = sr[1]
+ local ht = sr[2]
+ local dp = sr[3]
+ local name = sr[4]
+ local view = sr[5]
+ 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 = new_hlist(colorize(width,height,depth,3,reference,"destination",texts,show_destinations))
+ 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,current)
+ if texts then
+ current = texts
+ 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
+ result = new_hlist(result)
+ 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 head and topofstack > 0 then
+ return inject_areas(head,attribute,makedestination,stack,done)
+ else
+ return head
+ end
+ end
+
+ -- will move
+
+ function references.mark(reference,h,d,view)
+ return setdestination(tex.currentgrouplevel,h,d,reference,view)
+ 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" },
+}
+
+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)