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|
if not modules then modules = { } end modules ['node-bck'] = {
version = 1.001,
comment = "companion to node-bck.tex",
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
local cleanupreferences, cleanupdestinations = false, true
local nodeinjections = backends.nodeinjections
local codeinjections = backends.codeinjections
local hpack_list = node.hpack
local list_dimensions = node.dimensions
-- current.glue_set current.glue_sign
local trace_backend = false trackers.register("nodes.backend", function(v) trace_backend = v end)
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 hlist = node.id("hlist")
local vlist = node.id("vlist")
local glue = node.id("glue")
local whatsit = node.id("whatsit")
local new_kern = nodes.kern
local has_attribute = node.has_attribute
local traverse = node.traverse
local find_node_tail = node.tail or node.slide
local tosequence = nodes.tosequence
local function dimensions(parent,start,stop)
stop = stop and stop.next
if parent then
if stop then
return list_dimensions(parent.glue_set,parent.glue_sign,parent.glue_order,start,stop)
else
return list_dimensions(parent.glue_set,parent.glue_sign,parent.glue_order,start)
end
else
if stop then
return list_dimensions(start,stop)
else
return list_dimensions(start)
end
end
end
--~ more compact
local function dimensions(parent,start,stop)
if parent then
return list_dimensions(parent.glue_set,parent.glue_sign,parent.glue_order,start,stop and stop.next)
else
return list_dimensions(start,stop and stop.next)
end
end
local function inject_range(head,first,last,reference,make,stack,parent,pardir,txtdir)
local width, height, depth = dimensions(parent,first,last)
if pardir == "TRT" or txtdir == "+TRT" then
width = - width
end
local result, resolved = make(width,height,depth,reference)
if result and resolved then
if head == first then
if trace_backend then
logs.report("backend","head: %04i %s %s %s => w=%s, h=%s, d=%s, c=%s",reference,pardir or "---",txtdir or "----",tosequence(first,last,true),width,height,depth,resolved)
end
result.next = first
first.prev = result
return result, last
else
if trace_backend then
logs.report("backend","middle: %04i %s %s => w=%s, h=%s, d=%s, c=%s",reference,pardir or "---",txtdir or "----",tosequence(first,last,true),width,height,depth,resolved)
end
local prev = first.prev
if prev then
result.next = first
result.prev = prev
prev.next = result
first.prev = result
else
result.next = first
first.prev = result
end
if first == head.next then
head.next = result -- hm, weird
end
return head, last
end
else
return head, last
end
end
local function inject_list(id,current,reference,make,stack,pardir,txtdir)
local width, height, depth, correction = current.width, current.height, current.depth, 0
local moveright = false
local first = current.list
if id == hlist then
-- 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 last.id == glue and last.subtype == 9 then
local prev = last.prev
moveright = first.id == glue and first.subtype == 8
if prev and prev.id == glue and prev.subtype == 15 then
width = dimensions(current,first,prev.prev) -- maybe not current as we already take care of it
else
if moveright and first.spec then
width = width - first.spec.stretch*current.glue_set * current.glue_sign
end
if last.spec then
width = width - last.spec.stretch*current.glue_set * current.glue_sign
end
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)
if result and resolved then
if trace_backend then
logs.report("backend","box: %04i %s %s: w=%s, h=%s, d=%s, c=%s",reference,pardir or "---",txtdir or "----",width,height,depth,resolved)
end
if not first then
current.list = result
elseif moveright then -- brr no prevs done
-- result after first
local n = first.next
result.next = n
first.next = result
result.prev = first
if n then n.prev = result end
else
-- first after result
result.next = first
first.prev = result
current.list = result
end
end
end
-- skip is somewhat messy
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 = current.id
local r = has_attribute(current,attribute)
if id == whatsit then
local subtype = current.subtype
if subtype == 6 then
pardir = current.dir
elseif subtype == 7 then
txtdir = current.dir
end
elseif id == hlist or id == vlist then
--~ if r and (not skip or r > skip) then
if not reference and r and (not skip or r > skip) then
inject_list(id,current,r,make,stack,pardir,txtdir)
--~ done[r] = true
end
if r then done[r] = (done[r] or 0) + 1 end
local list = current.list
if list then
local _
current.list, _, pardir, txtdir = inject_areas(list,attribute,make,stack,done,r or skip or 0,current,pardir,txtdir)
end
if r then done[r] = done[r] - 1 end
elseif 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 not done[reference] then
elseif (done[reference] or 0) == 0 then
if not skip or r > skip then
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
current = current.next
end
--~ if reference and not done[reference] then
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 = current.id
local r = has_attribute(current,attribute)
if id == whatsit then
local subtype = current.subtype
if subtype == 6 then
pardir = current.dir
elseif subtype == 7 then
txtdir = current.dir
end
elseif id == hlist or id == vlist then
if r and not done[r] then
done[r] = true
inject_list(id,current,r,make,stack,pardir,txtdir)
end
current.list = inject_area(current.list,attribute,make,stack,done,current,pardir,txtdir)
elseif r and not done[r] then
done[r] = true
head, current = inject_range(head,current,current,r,make,stack,parent,pardir,txtdir)
end
current = current.next
end
end
return head, true
end
-- tracing
local new_rule = nodes.rule
local new_kern = nodes.kern
local set_attribute = node.set_attribute
local register_color = colors.register
local a_colormodel = attributes.private('colormodel')
local a_color = attributes.private('color')
local a_transparency = attributes.private('transparency')
local u_transparency = nil
local u_colors = { }
local force_gray = true
local function colorize(width,height,depth,n)
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
local rule = new_rule(width,height,depth)
set_attribute(rule,a_colormodel,1) -- gray color model
set_attribute(rule,a_color,u_color)
set_attribute(rule,a_transparency,u_transparency)
if width < 0 then
local kern = new_kern(width)
rule.width = -width
kern.next = rule
rule.prev = kern
return kern
else
return rule
end
end
local new_kern = nodes.kern
local texattribute = tex.attribute
local texcount = tex.count
-- references:
nodes.references = {
attribute = attributes.private('reference'),
stack = { },
done = { },
}
local stack, done, attribute = nodes.references.stack, nodes.references.done, nodes.references.attribute
local nofreferences, topofstack = 0, 0
local function setreference(n,h,d,r) -- n is just a number, can be used for tracing
topofstack = topofstack + 1
stack[topofstack] = { n, h, d, codeinjections.prerollreference(r) } -- the preroll permits us to determine samepage (but delayed also has some advantages)
--~ texattribute[attribute] = topofstack -- todo -> at tex end
texcount.lastreferenceattribute = topofstack
end
nodes.setreference = setreference
local function makereference(width,height,depth,reference)
local sr = stack[reference]
if sr then
local resolved, ht, dp, set = sr[1], sr[2], sr[3], sr[4]
if ht then
if height < ht then height = ht end
if depth < dp then depth = dp end
end
local annot = nodeinjections.reference(width,height,depth,set)
if annot then
nofreferences = nofreferences + 1
local result, current
if trace_references then
local step = 65536
result = hpack_list(colorize(width,height-step,depth-step,2)) -- step subtracted so that we can see seperate links
result.width = 0
current = result
end
if current then
current.next = annot
else
result = annot
end
result = hpack_list(result,0)
result.width, result.height, result.depth = 0, 0, 0
if cleanupreferences then stack[reference] = nil end
return result, resolved
else
logs.report("backends","unable to resolve reference annotation %s",reference)
end
else
logs.report("backends","unable to resolve reference attribute %s",reference)
end
end
function nodes.add_references(head)
if topofstack > 0 then
return inject_areas(head,attribute,makereference,stack,done)
else
return head, false
end
end
-- destinations (we can clean up once set!)
nodes.destinations = {
attribute = attributes.private('destination'),
stack = { },
done = { },
}
local stack, done, attribute = nodes.destinations.stack, nodes.destinations.done, nodes.destinations.attribute
local nofdestinations, topofstack = 0, 0
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
nodes.setdestination = setdestination
local function makedestination(width,height,depth,reference)
local sr = stack[reference]
if sr then
local resolved, ht, dp, name, view = sr[1], sr[2], sr[3], sr[4], sr[5]
if ht then
if height < ht then height = ht end
if depth < dp then depth = dp end
end
local result, current
if trace_destinations then
local step = 0
if width == 0 then
step = 4*65536
width, height, depth = 5*step, 5*step, 0
end
for n=1,#name do
local rule = hpack_list(colorize(width,height,depth,3))
rule.width = 0
if not result then
result, current = rule, rule
else
current.next = rule
rule.prev = current
current = rule
end
width, height = width - step, height - step
end
end
nofdestinations = nofdestinations + 1
for n=1,#name do
local annot = nodeinjections.destination(width,height,depth,name[n],view)
if not result then
result, current = annot, annot
else
current.next = annot
annot.prev = current
current = annot
end
end
result = hpack_list(result,0)
result.width, result.height, result.depth = 0, 0, 0
if cleanupdestinations then stack[reference] = nil end
return result, resolved
else
logs.report("backends","unable to resolve destination attribute %s",reference)
end
end
function nodes.add_destinations(head)
if topofstack > 0 then
return inject_area(head,attribute,makedestination,stack,done) -- singular
else
return head, false
end
end
-- will move
function jobreferences.mark(reference,h,d,view)
return setdestination(tex.currentgrouplevel,h,d,reference,view)
end
function jobreferences.inject(prefix,reference,h,d,highlight,newwindow,layer) -- todo: use currentreference is possible
local set, bug = jobreferences.identify(prefix,reference)
if bug or #set == 0 then
-- unknown ref, just don't set it and issue an error
else
-- check
set.highlight, set.newwindow,set.layer = highlight, newwindow, layer
setreference(tex.currentgrouplevel,h,d,set) -- sets attribute / todo: for set[*].error
end
end
function jobreferences.injectcurrentset(h,d) -- used inside doifelse
local currentset = jobreferences.currentset
if currentset then
setreference(tex.currentgrouplevel,h,d,currentset) -- sets attribute / todo: for set[*].error
end
end
--
local function checkboth(open,close)
if open and open ~= "" then
local set, bug = jobreferences.identify("",open)
open = not bug and #set > 0 and set
end
if close and close ~= "" then
local set, bug = jobreferences.identify("",close)
close = not bug and #set > 0 and set
end
return open, close
end
-- expansion is temp hack
local opendocument, closedocument, openpage, closepage
local function check(what)
if what and what ~= "" then
local set, bug = jobreferences.identify("",what)
return not bug and #set > 0 and set
end
end
function jobreferences.checkopendocumentactions (open) opendocument = check(open) end
function jobreferences.checkclosedocumentactions(close) closedocument = check(close) end
function jobreferences.checkopenpageactions (open) openpage = check(open) end
function jobreferences.checkclosepageactions (close) closepage = check(close) end
function jobreferences.flushdocumentactions()
if opendocument or closedocument then
backends.codeinjections.flushdocumentactions(opendocument,closedocument) -- backend
end
end
function jobreferences.flushpageactions()
if openpage or closepage then
backends.codeinjections.flushpageactions(openpage,closepage) -- backend
end
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)
|