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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
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