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if not modules then modules = { } end modules ['spac-ali'] = {
version = 1.001,
optimize = true,
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 enableaction = tasks.enableaction
local nuts = nodes.nuts
local setlist = nuts.setlist
local setlink = nuts.setlink
local getdirection = nuts.getdirection
local takeattr = nuts.takeattr
local getwidth = nuts.getwidth
local findtail = nuts.tail
local righttoleft_code = nodes.dirvalues.righttoleft
local linelist_code = nodes.listcodes.line
local hpack_nodes = nuts.hpack
local nextlist = nuts.traversers.list
local new_stretch = nuts.pool.stretch
local a_realign = attributes.private("realign")
local c_realpageno = tex.iscount("realpageno")
local texsetattribute = tex.setattribute
local texgetcount = tex.getcount
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)
for current, id, subtype, list in nextlist, head do
if subtype == linelist_code then
local a = takeattr(current,a_realign)
if a and a > 0 then
local pageno = div(a,10)
if pageno ~= realpageno then
local align = a % 10
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
-- WS: watch this
local direction = getdirection(current)
-- or should this happen at the tex end:
if direction == righttoleft_code then
if action == 1 then
action = 2
elseif action == 2 then
action = 1
end
end
-- Currently we just prepend and append which kind of spoils the normalization unless
-- we extend our specs and also introduce left/right anchored stuff.
if action == 1 then
local head = list
setlink(findtail(list),new_stretch(3)) -- append
setlist(current,hpack_nodes(head,getwidth(current),"exactly",direction))
if trace_realign then
report_realign("flushing left, align %a, page %a, realpage %a",align,pageno,realpageno)
end
elseif action == 2 then
local head = setlink(new_stretch(3),list) -- prepend
setlist(current,hpack_nodes(head,getwidth(current),"exactly",direction))
if trace_realign then
report_realign("flushing right, align %a, page %a, realpage %a",align,pageno,realpageno)
end
elseif trace_realign then
report_realign("invalid flushing, align %a, page %a, realpage %a",align,pageno,realpageno)
end
nofrealigned = nofrealigned + 1
end
end
end
handler(list,leftpage,realpageno)
end
return head
end
function alignments.handler(head)
return handler(head,isleftpage(),texgetcount(c_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
texsetattribute(a_realign,texgetcount(c_realpageno) * 10 + n)
end
interfaces.implement {
name = "setrealign",
actions = alignments.set,
arguments = "integer",
}
statistics.register("realigning", function()
if nofrealigned > 0 then
return format("%s processed",nofrealigned)
else
return nil
end
end)
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