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|
if not modules then modules = { } end modules ['typo-syn'] = {
version = 1.000,
optimize = true,
comment = "companion to typo-syn.mkxl",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local nodes = nodes
local tasks = nodes.tasks
local enableaction = tasks.enableaction
----- disableaction = tasks.disableaction
local nuts = nodes.nuts
local tonut = nodes.tonut
local getnext = nuts.getnext
local getprev = nuts.getprev
local getid = nuts.getid
local getsubtype = nuts.getsubtype
local getattr = nuts.getattr
local setattrlist = nuts.setattrlist
local getattrlist = nuts.getattrlist
local getprop = nuts.getprop
local setprop = nuts.setprop
local setlink = nuts.setlink
local setprev = nuts.setprev
local setnext = nuts.setnext
local setoffsets = nuts.setoffsets
local getwhd = nuts.getwhd
local getwidth = nuts.getwidth
local setwidth = nuts.setwidth
local getdepth = nuts.getdepth
local setdepth = nuts.setdepth
local getheight = nuts.getheight
local setheight = nuts.setheight
local gettotal = nuts.gettotal
local getlist = nuts.getlist
local setlist = nuts.setlist
local getdisc = nuts.getdisc
local setdisc = nuts.setdisc
local hpack = nuts.hpack
local rangedimensions = nuts.rangedimensions
local insertbefore = nuts.insertbefore
local removenode = nuts.remove
local flushnode = nuts.flush
local traverselist = nuts.traverselist
local nodecodes = nodes.nodecodes
local glyph_code = nodecodes.glyph
local rule_code = nodecodes.rule
local disc_code = nodecodes.disc
local hlist_code = nodecodes.hlist
local vlist_code = nodecodes.vlist
local glue_code = nodecodes.glue
local kern_code = nodecodes.kern
local penalty_code = nodecodes.penalty
local line_code = nodes.listcodes.line
local fontkern_code = nodes.kerncodes.fontkern
local parfillrightskip_code = nodes.gluecodes.parfillrightskip
local baselineskip_code = nodes.gluecodes.baselineskip
-----------------
local a_synchronize = attributes.private("synchronize")
local parallels = typesetters.parallels or { }
typesetters.parallels = parallels or { }
local registervalue = attributes.registervalue
local getvalue = attributes.getvalue
local hasvalues = attributes.hasvalues
local trace = false
-- local trace = true
local report = logs.reporter("parallel")
local pushsavelevel = tex.pushsavelevel -- token.expandmacro("bgroup")
local popsavelevel = tex.popsavelevel -- token.expandmacro("egroup")
local dontcomplain = tex.dontcomplain
local slack = 6553.6
local index = 0
local lastattr = nil
local lastline = nil
interfaces.implement {
name = "registersynchronize",
arguments = { "dimen", "dimen", "box" },
actions = function(ht,dp,box)
index = index + 1
box = tonut(box)
local t = {
index = index,
lineheight = ht,
linedepth = dp,
height = getheight(height),
depth = getheight(depth),
box = box,
}
local v = registervalue(a_synchronize,t)
tex.setattribute(a_synchronize,v)
if index > 0 then
enableaction("vboxbuilders", "typesetters.parallels.handler")
enableaction("mvlbuilders", "typesetters.parallels.handler")
end
end,
}
local function hsplit(box,width)
local first = getlist(box)
local last = first
local current = first
local previous = current
local sofar = 0
local lastdisc = nil
-- todo: option
width = width - slack
--
while true do
previous = current
local id = getid(current)
if id == glyph_code then
local wd = getwidth(current)
if sofar + wd > width then
break
else
sofar = sofar + wd
end
elseif id == kern_code then
if getsubtype(current) == fontkern_code then
-- assume sane kerns
local wd = getwidth(current)
sofar = sofar + wd
else
last = previous
local wd = getwidth(current)
if sofar + wd > width then
break
else
sofar = sofar + wd
end
lastdisc = nil
end
elseif id == disc_code then
-- move on / inject post if needed
local pre, post, replace = getdisc(current)
local wdr = replace and rangedimensions(box,replace) or 0
if sofar + wdr > width then
-- handle post and pre here
last = previous
break
end
local wdp = pre and rangedimensions(box,pre) or 0
-- if sofar + wdp > width then
-- last = previous
--lastdisc = current
-- break
-- end
sofar = sofar + wdr
lastdisc = current
elseif id == glue_code then
last = previous
local wd = getwidth(current)
if sofar + wd > width then
break
else
sofar = sofar + wd
end
lastdisc = nil
elseif id == hlist_code or id == vlist_code then
last = previous
local wd = getwidth(current)
if sofar + wd > width then
break
else
sofar = sofar + wd
end
lastdisc = nil
elseif id == rule_code then
last = previous
local wd = getwidth(current)
if sofar + wd > width then
break
else
sofar = sofar + wd
end
lastdisc = nil
else
lastdisc = nil
end
local next = getnext(current)
if next then
current = next
else
last = previous
break
end
end
local next
if lastdisc then
local pre, post, replace = getdisc(lastdisc)
last = getprev(lastdisc)
--
next = getnext(lastdisc)
if next then
setprev(next)
end
--
setlink(last,pre)
if post then
setlink(post,next)
next = post
end
setdisc(lastdisc,nil,nil,replace)
flushnode(lastdisc)
else
next = getnext(last)
if next then
setprev(next)
end
setnext(last)
end
while last do
local id = getid(last)
if id == glue_code or id == penalty_code then
first, last = removenode(first,last,true)
else
break
end
end
if first then
pushsavelevel()
dontcomplain()
local result, badness = hpack(first,width,"exactly")
if badness > 200 then
result = hpack(first)
end
popsavelevel()
setattrlist(result,getattrlist(box)) -- useattrlist(result,box)
setheight(result,getheight(box))
setdepth(result,getdepth(box))
setlist(box,next)
setwidth(box,rangedimensions(box,next))
return result
end
end
local function getproperties(parent)
local props = getprop(parent,"parallel")
if not props then
local w, h, d = getwhd(parent)
props = {
width = w,
height = h,
depth = d,
}
setprop(parent,"parallel",props)
end
return props
end
local function setproperties(parent,data,result,level,ctotal)
local props = getproperties(parent)
local depth = props.depth
local height = props.height
local delta = data.linedepth - depth
if delta > 0 then
depth = data.linedepth
setdepth(parent,depth)
props.depth = depth
local n = getnext(parent)
if n and getid(n) == glue_code and getsubtype(n) == baselineskip_code then
setwidth(n,getwidth(n) - delta)
end
end
-- if height < data.lineheight then
-- height = data.lineheight
-- setheight(parent,height)
-- props.height = height
-- end
local offset = level * ctotal
if props.depth + offset > depth then
setdepth(parent,props.depth+offset)
end
setoffsets(result,0,-offset)
setwidth(result,0)
end
local function flush(head,first,last,a,parent,nesting)
if first and nesting == 0 then
local data = getvalue(a_synchronize,a)
local upto = getnext(last)
if upto and getid(upto) == penalty_code then
upto = getnext(upto)
end
if upto and getid(upto) == glue_code and getsubtype(upto) == parfillrightskip_code then
upto = getnext(upto)
end
local props = getproperties(parent)
local width = rangedimensions(parent,first,upto)
if width > props.width then
width = props.width
end
local content = data.box
local index = data.index
if not content then
if trace then
report("index %i, verdict %a",index,"done")
end
else
local result = nil
local cwidth = getwidth(content)
local ctotal = gettotal(content)
if cwidth <= width then -- slack
if trace then
report("index %i, available %p, content %p, verdict %a",index,width,cwidth,"fit")
end
result = content
data.box = nil
elseif cwidth > width then
if trace then
report("index %i, available %p, content %p, verdict %a",index,width,cwidth,"overflow")
end
result = hsplit(content,width)
lastattr = a
lastline = parent
else
report("index %i, verdict %a",index,"weird")
end
if result then
setproperties(parent,data,result,1,ctotal)
head = insertbefore(head,first,result)
end
end
end
return head
end
local function lastflush(lastline,lastattr)
local data = getvalue(a_synchronize,lastattr)
if not data then
return
end
local content = data.box
if not content or getwidth(content) == 0 then
return
end
local head = getlist(lastline)
if not head then
return
end
local first = head
local last = nil
local props = getproperties(lastline)
local width = props.width
local height = props.height
local depth = props.depth
local level = 1
if depth < data.linedepth then
depth = data.linedepth
setdepth(lastline,depth)
end
if height < data.lineheight then
height = data.lineheight
setheight(lastline,height)
end
while true do
local content = data.box
local index = data.index
if content then
local result = nil
local total = 0
local cwidth = getwidth(content)
local ctotal = gettotal(content)
if cwidth <= width then -- slack
if trace then
report("index %i, available %p, content %p, verdict %a",index,width,cwidth,"fit")
end
result = content
data.box = nil
elseif cwidth > width then
if trace then
report("index %i, available %p, content %p, verdict %a",index,width,cwidth,"overflow")
end
result = hsplit(content,width)
else
report("index %i, verdict %a",index,"weird")
end
if result then
level = level + 1
setproperties(lastline,data,result,level,ctotal)
head = insertbefore(head,first,result)
setlist(lastline,head)
else
break
end
else
break
end
end
end
local processranges = nuts.processranges
function parallels.handler(head,where)
if where == "hmodepar" and hasvalues(a_synchronize) then
lastattr = nil
lastline = nil
for n, id, subtype in traverselist(head) do
if subtype == line_code then
lastattr = nil
local list = getlist(n)
local head = processranges(a_synchronize,flush,list,n)
if head ~= list then
setlist(n,head)
end
end
end
if lastattr and lastline then
lastflush(lastline,lastattr)
end
end
return head
end
|