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if not modules then modules = { } end modules ['page-str'] = {
version = 1.001,
comment = "companion to page-str.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- work in progresss .. unfinished
local concat = table.concat
local find_tail, write_node, free_node, copy_nodelist = node.slide, node.write, node.free, node.copy_list
local vpack_nodelist, hpack_nodelist = node.vpack, node.hpack
local texdimen, texbox = tex.dimen, tex.box
local new_kern = nodes.kern
local new_glyph = nodes.glyph
local trace_collecting = false trackers.register("streams.collecting", function(v) trace_collecting = v end)
local trace_flushing = false trackers.register("streams.flushing", function(v) trace_flushing = v end)
streams = streams or { }
local data, name, stack = { }, nil, { }
function streams.enable(newname)
if newname == "default" then
name = nil
else
name = newname
end
end
function streams.disable()
name = stack[#stack]
end
function streams.start(newname)
table.insert(stack,name)
name = newname
end
function streams.stop(newname)
name = table.remove(stack)
end
function streams.collect(head,where)
if name and head and name ~= "default" then
local tail = node.slide(head)
local dana = data[name]
if not dana then
dana = { }
data[name] = dana
end
local last = dana[#dana]
if last then
local tail = find_tail(last)
tail.next, head.prev = head, tail
elseif last == false then
dana[#dana] = head
else
dana[1] = head
end
if trace_collecting then
logs.report("streams","appending snippet '%s' to slot %s",name,#dana)
end
return nil, true
else
return head, false
end
end
function streams.push(thename)
if not thename or thename == "" then
thename = name
end
if thename and thename ~= "" then
local dana = data[thename]
if dana then
dana[#dana+1] = false
if trace_collecting then
logs.report("streams","pushing snippet '%s'",thename)
end
end
end
end
function streams.flush(name,copy) -- problem: we need to migrate afterwards
local dana = data[name]
if dana then
local dn = #dana
if dn == 0 then
-- nothing to flush
elseif copy then
if trace_flushing then
logs.report("streams","flushing copies of %s slots of '%s'",dn,name)
end
for i=1,dn do
local di = dana[i]
if di then
write_node(copy_nodelist(di.list)) -- list, will be option
end
end
if copy then
data[name] = nil
end
else
if trace_flushing then
logs.report("streams","flushing %s slots of '%s'",dn,name)
end
for i=1,dn do
local di = dana[i]
if di then
write_node(di.list) -- list, will be option
di.list = nil
free_node(di)
end
end
end
end
end
function streams.synchronize(list) -- this is an experiment !
-- we don't optimize this as we want to trace in detail
list = aux.settings_to_array(list)
local max = 0
if trace_flushing then
logs.report("streams","synchronizing list: %s",concat(list," "))
end
for i=1,#list do
local dana = data[list[i]]
if dana then
local n = #dana
if n > max then
max = n
end
end
end
if trace_flushing then
logs.report("streams","maximum number of slots: %s",max)
end
for m=1,max do
local height, depth = 0, 0
for i=1,#list do
local name = list[i]
local dana = data[name]
local slot = dana[m]
if slot then
local vbox = vpack_nodelist(slot)
local ht, dp = vbox.height, vbox.depth
if ht > height then
height = ht
end
if dp > depth then
depth = dp
end
dana[m] = vbox
if trace_flushing then
logs.report("streams","slot %s of '%s' is packed to height %s and depth %s",m,name,ht,dp)
end
end
end
if trace_flushing then
logs.report("streams","slot %s has max height %s and max depth %s",m,height,depth)
end
local strutht, strutdp = texdimen.globalbodyfontstrutheight, texdimen.globalbodyfontstrutdepth
local struthtdp = strutht + strutdp
for i=1,#list do
local name = list[i]
local dana = data[name]
local vbox = dana[m]
if vbox then
local delta_height = height - vbox.height
local delta_depth = depth - vbox.depth
if delta_height > 0 or delta_depth > 0 then
if false then
-- actually we need to add glue and repack
vbox.height, vbox.depth = height, depth
if trace_flushing then
logs.report("streams","slot %s of '%s' with delta (%s,%s) is compensated",m,i,delta_height,delta_depth)
end
else
-- this is not yet ok as we also need to keep an eye on vertical spacing
-- so we might need to do some splitting or whatever
local tail = vbox.list and find_tail(vbox.list)
local n, delta = 0, delta_height -- for tracing
while delta > 0 do
-- we need to add some interline penalties
local line = copy_nodelist(tex.box.strutbox)
line.height, line.depth = strutht, strutdp
if tail then
tail.next, line.prev = line, tail
end
tail = line
n, delta = n +1, delta - struthtdp
end
dana[m] = vpack_nodelist(vbox.list)
vbox.list = nil
free_node(vbox)
if trace_flushing then
logs.report("streams","slot %s:%s with delta (%s,%s) is compensated by %s lines",m,i,delta_height,delta_depth,n)
end
end
end
else
-- make dummy
end
end
end
end
tasks.appendaction("mvlbuilders", "normalizers", "streams.collect")
tasks.disableaction("mvlbuilders", "streams.collect")
function streams.initialize()
tasks.enableaction ("mvlbuilders", "streams.collect")
end
-- todo: remove empty last { }'s
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