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if not modules then modules = { } end modules ['node-bck'] = {
version = 1.001,
comment = "companion to node-bck.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- beware, this one takes quite some runtime, so we need a status flag
-- maybe some page related state
local attributes, nodes, node = attributes, nodes, node
local nodecodes = nodes.nodecodes
local listcodes = nodes.listcodes
local hlist_code = nodecodes.hlist
local vlist_code = nodecodes.vlist
local glyph_code = nodecodes.glyph
local cell_code = listcodes.cell
local traverse = node.traverse
local traverse_id = node.traverse_id
local nodepool = nodes.pool
local tasks = nodes.tasks
local new_rule = nodepool.rule
local new_glue = nodepool.glue
local a_color = attributes.private('color')
local a_transparency = attributes.private('transparency')
local a_colorspace = attributes.private('colormodel')
local a_background = attributes.private('background')
local a_alignbackground = attributes.private('alignbackground')
local function add_backgrounds(head) -- rather old code .. to be redone
local current = head
while current do
local id = current.id
if id == hlist_code or id == vlist_code then
local list = current.list
if list then
local head = add_backgrounds(list)
if head then
current.list = head
list = head
end
end
local width = current.width
if width > 0 then
local background = current[a_background]
if background then
-- direct to hbox
-- colorspace is already set so we can omit that and stick to color
local mode = current[a_colorspace]
if mode then
local height = current.height
local depth = current.depth
local skip = id == hlist_code and width or (height + depth)
local glue = new_glue(-skip)
local rule = new_rule(width,height,depth)
local color = current[a_color]
local transparency = current[a_transparency]
rule[a_colorspace] = mode
if color then
rule[a_color] = color
end
if transparency then
rule[a_transparency] = transparency
end
rule.next = glue
glue.prev = rule
if list then
glue.next = list
list.prev = glue
end
current.list = rule
end
end
end
end
current = current.next
end
return head, true
end
local function add_alignbackgrounds(head)
local current = head
while current do
local id = current.id
if id == hlist_code then
local list = current.list
if not list then
-- no need to look
elseif current.subtype == cell_code then
local background = nil
local found = nil
-- for l in traverse(list) do
-- background = l[a_alignbackground]
-- if background then
-- found = l
-- break
-- end
-- end
-- we know that it's a fake hlist (could be user node)
-- but we cannot store tables in user nodes yet
for l in traverse_id(hpack_code,list) do
background = l[a_alignbackground]
if background then
found = l
end
break
end
--
if background then
-- current has subtype 5 (cell)
local width = current.width
if width > 0 then
local mode = found[a_colorspace]
if mode then
local glue = new_glue(-width)
local rule = new_rule(width,current.height,current.depth)
local color = found[a_color]
local transparency = found[a_transparency]
rule[a_colorspace] = mode
if color then
rule[a_color] = color
end
if transparency then
rule[a_transparency] = transparency
end
rule.next = glue
glue.prev = rule
if list then
glue.next = list
list.prev = glue
end
current.list = rule
end
end
end
else
add_alignbackgrounds(list)
end
elseif id == vlist_code then
local list = current.list
if list then
add_alignbackgrounds(list)
end
end
current = current.next
end
return head, true
end
nodes.handlers.backgrounds = add_backgrounds
nodes.handlers.alignbackgrounds = add_alignbackgrounds
tasks.appendaction("shipouts","normalizers","nodes.handlers.backgrounds")
tasks.appendaction("shipouts","normalizers","nodes.handlers.alignbackgrounds")
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