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if not modules then modules = { } end modules ['spac-ali'] = {
version = 1.001,
comment = "companion to spac-ali.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local div = math.div
local format = string.format
local tasks = nodes.tasks
local appendaction = tasks.appendaction
local prependaction = tasks.prependaction
local disableaction = tasks.disableaction
local enableaction = tasks.enableaction
local has_attribute = node.has_attribute
local unset_attribute = node.unset_attribute
local slide_nodes = node.slide
local hpack_nodes = node.hpack -- nodes.fasthpack not really faster here
local link_nodes = nodes.link
local nodecodes = nodes.nodecodes
local listcodes = nodes.listcodes
local hlist_code = nodecodes.hlist
local vlist_code = nodecodes.vlist
local line_code = listcodes.line
local nodepool = nodes.pool
local new_stretch = nodepool.stretch
local a_realign = attributes.private("realign")
local texattribute = tex.attribute
local texcount = tex.count
local isleftpage = layouts.status.isleftpage
typesetters = typesetters or { }
local alignments = { }
typesetters.alignments = alignments
local report_realign = logs.reporter("typesetters","margindata")
local trace_realign = trackers.register("typesetters.margindata", function(v) trace_margindata = v end)
local nofrealigned = 0
-- leftskip rightskip parfillskip
-- raggedleft 0 + 0 -
-- raggedright 0 0 fil
-- raggedcenter 0 + 0 + -
local function handler(head,leftpage,realpageno)
local current = head
local done = false
while current do
local id = current.id
if id == hlist_code then
if current.subtype == line_code then
local a = has_attribute(current,a_realign)
if not a or a == 0 then
-- skip
else
local align = a % 10
local pageno = div(a,10)
if pageno == realpageno then
-- already ok
else
local action = 0
if align == 1 then -- flushright
action = leftpage and 1 or 2
elseif align == 2 then -- flushleft
action = leftpage and 2 or 1
end
if action == 1 then
current.list = hpack_nodes(link_nodes(current.list,new_stretch(3)),current.width,"exactly")
if trace_realign then
report_realign("flush left: align %s, page %s, realpage %s",align,pageno,realpageno)
end
elseif action == 2 then
current.list = hpack_nodes(link_nodes(new_stretch(3),current.list),current.width,"exactly")
if trace_realign then
report_realign("flush right: align %s, page %s, realpage %s",align,pageno,realpageno)
end
elseif trace_realign then
report_realign("invalid: align %s, page %s, realpage %s",align,pageno,realpageno)
end
done = true
nofrealigned = nofrealigned + 1
end
unset_attribute(current,a_realign)
end
end
handler(current.list,leftpage,realpageno)
elseif id == vlist_code then
handler(current.list,leftpage,realpageno)
end
current = current.next
end
return head, done
end
function alignments.handler(head)
local leftpage = isleftpage(true,false)
local realpageno = texcount.realpageno
return handler(head,leftpage,realpageno)
end
local enabled = false
function alignments.set(n)
if not enabled then
enableaction("shipouts","typesetters.alignments.handler")
enabled = true
if trace_realign then
report_realign("enabled")
end
end
texattribute[a_realign] = texcount.realpageno * 10 + n
end
commands.setrealign = alignments.set
statistics.register("realigning", function()
if nofrealigned > 0 then
return format("%s processed",nofrealigned)
else
return nil
end
end)
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