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diff --git a/tex/context/base/mkxl/back-exp-imp-ref.lmt b/tex/context/base/mkxl/back-exp-imp-ref.lmt
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+if not modules then modules = { } end modules ['back-exp-imp-ref'] = {
+ version = 1.001,
+ comment = "companion to back-exp.mkiv",
+ author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
+ copyright = "PRAGMA ADE / ConTeXt Development Team",
+ license = "see context related readme files"
+}
+
+-- quite some code deals with exporting references --
+
+-- links:
+--
+-- url :
+-- file :
+-- internal : automatic location
+-- location : named reference
+
+-- references:
+--
+-- implicit : automatic reference
+-- explicit : named reference
+
+local tonumber = tonumber
+local lpegmatch = lpeg.match
+local insert = table.insert
+
+local references = structures.references
+
+local structurestags = structures.tags
+local specifications = structurestags.specifications
+local locatedtag = structurestags.locatedtag
+
+local backend = structurestags.backend
+
+local setattribute = backend.setattribute
+local extras = backend.extras
+local fixes = backend.fixes
+local referencehash = backend.referencehash
+local destinationhash = backend.destinationhash
+
+local implement = interfaces.implement
+
+local evaluators = { }
+local specials = { }
+local explicits = { }
+
+evaluators.inner = function(di,var)
+ local inner = var.inner
+ if inner then
+ setattribute(di,"location",inner,true)
+ end
+end
+
+evaluators.outer = function(di,var)
+ local file, url = references.checkedfileorurl(var.outer,var.outer)
+ if url then
+ setattribute(di,"url",url,true)
+ elseif file then
+ setattribute(di,"file",file,true)
+ end
+end
+
+evaluators["outer with inner"] = function(di,var)
+ local file = references.checkedfile(var.f)
+ if file then
+ setattribute(di,"file",file,true)
+ end
+ local inner = var.inner
+ if inner then
+ setattribute(di,"inner",inner,true)
+ end
+end
+
+evaluators.special = function(di,var)
+ local handler = specials[var.special]
+ if handler then
+ handler(di,var)
+ end
+end
+
+do
+
+ evaluators["special outer with operation"] = evaluators.special
+ evaluators["special operation"] = evaluators.special
+ evaluators["special operation with arguments"] = evaluators.special
+
+ function specials.url(di,var)
+ local url = references.checkedurl(var.operation)
+ if url and url ~= "" then
+ setattribute(di,"url",url,true)
+ end
+ end
+
+ function specials.file(di,var)
+ local file = references.checkedfile(var.operation)
+ if file and file ~= "" then
+ setattribute(di,"file",file,true)
+ end
+ end
+
+ function specials.fileorurl(di,var)
+ local file, url = references.checkedfileorurl(var.operation,var.operation)
+ if url and url ~= "" then
+ setattribute(di,"url",url,true)
+ elseif file and file ~= "" then
+ setattribute(di,"file",file,true)
+ end
+ end
+
+ function specials.internal(di,var)
+ local internal = references.checkedurl(var.operation)
+ if internal then
+ setattribute(di,"location",internal)
+ end
+ end
+
+ local function adddestination(di,references) -- todo: specials -> exporters and then concat
+ if references then
+ local reference = references.reference
+ if reference and reference ~= "" then
+ local prefix = references.prefix
+ if prefix and prefix ~= "" then
+ setattribute(di,"prefix",prefix,true)
+ end
+ setattribute(di,"destination",reference,true)
+ for i=1,#references do
+ local r = references[i]
+ local e = evaluators[r.kind]
+ if e then
+ e(di,r)
+ end
+ end
+ end
+ end
+ end
+
+ function extras.addimplicit(di,references)
+ if references then
+ local internal = references.internal
+ if internal then
+ setattribute(di,"implicit",internal)
+ end
+ end
+ end
+
+ function extras.addinternal(di,references)
+ if references then
+ local internal = references.internal
+ if internal then
+ setattribute(di,"internal",internal)
+ end
+ end
+ end
+
+ local p_firstpart = lpeg.Cs((1-lpeg.P(","))^0)
+
+ local function addreference(di,references)
+ if references then
+ local reference = references.reference
+ if reference and reference ~= "" then
+ local prefix = references.prefix
+ if prefix and prefix ~= "" then
+ setattribute(di,"prefix",prefix)
+ end
+ setattribute(di,"reference",reference,true)
+ setattribute(di,"explicit",lpegmatch(p_firstpart,reference),true)
+ end
+ local internal = references.internal
+ if internal and internal ~= "" then
+ setattribute(di,"implicit",internal)
+ end
+ end
+ end
+
+ local function link(di,element,n,fulltag)
+ -- for instance in lists a link has nested elements and no own text
+ local reference = referencehash[fulltag]
+ if reference then
+ adddestination(di,structures.references.get(reference))
+ return true
+ else
+ local data = di.data
+ if data then
+ for i=1,#data do
+ local di = data[i]
+ if di then
+ local fulltag = di.fulltag
+ if fulltag and link(di,element,n,fulltag) then
+ return true
+ end
+ end
+ end
+ end
+ end
+ end
+
+ local function reference(di,element,n,fulltag)
+ local destination = destinationhash[fulltag]
+ if destination then
+ local d = structures.references.internals[destination]
+ if d then
+ addreference(di,d.references)
+ return true
+ else
+ return false
+ end
+ else
+ local data = di.data
+ if data then
+ for i=1,#data do
+ local di = data[i]
+ if di then
+ local fulltag = di.fulltag
+ if fulltag and reference(di,element,n,fulltag) then
+ return true
+ end
+ end
+ end
+ end
+ end
+ end
+
+ extras.adddestination = adddestination
+ extras.addreference = addreference
+
+ extras.link = link
+ extras.reference = reference
+
+end
+
+do
+
+ function fixes.linenumber(di,data,i)
+ local ni = data[i+1]
+ if ni then
+ if ni.data then
+ while true do
+ local d = ni.data[1]
+ if d then
+ local e = d.element
+ if e then
+ if e == "line" or e == "verbatimline" then
+ insert(d.data,1,di)
+ data[i] = false
+ return
+ else
+ ni = d
+ end
+ else
+ return
+ end
+ else
+ return
+ end
+ end
+ end
+ end
+ end
+
+end
+