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if not modules then modules = { } end modules ['pack-rul'] = {
version = 1.001,
comment = "companion to pack-rul.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
--[[ldx--
<p>An explanation is given in the history document <t>mk</t>.</p>
--ldx]]--
-- we need to be careful with display math as it uses shifts
-- challenge: adapt glue_set
-- setfield(h,"glue_set", getfield(h,"glue_set") * getfield(h,"width")/maxwidth -- interesting ... doesn't matter much
local hlist_code = nodes.nodecodes.hlist
local vlist_code = nodes.nodecodes.vlist
local box_code = nodes.listcodes.box
local line_code = nodes.listcodes.line
local texsetdimen = tex.setdimen
local texsetcount = tex.setcount
local texgetbox = tex.getbox
local hpack = nodes.hpack
local free = nodes.free
local copy = nodes.copy_list
local traverse_id = nodes.traverse_id
local node_dimensions = nodes.dimensions
function commands.doreshapeframedbox(n)
local box = texgetbox(n)
local noflines = 0
local firstheight = nil
local lastdepth = nil
local lastlinelength = 0
local minwidth = 0
local maxwidth = 0
local totalwidth = 0
local averagewidth = 0
local boxwidth = box.width
if boxwidth ~= 0 then -- and h.subtype == vlist_code
local list = box.list
if list then
local function check(n,repack)
if not firstheight then
firstheight = n.height
end
lastdepth = n.depth
noflines = noflines + 1
local l = n.list
if l then
if repack then
local subtype = n.subtype
if subtype == box_code or subtype == line_code then
lastlinelength = node_dimensions(l,n.dir) -- used to be: hpack(copy(l)).width
else
lastlinelength = n.width
end
else
lastlinelength = n.width
end
if lastlinelength > maxwidth then
maxwidth = lastlinelength
end
if lastlinelength < minwidth or minwidth == 0 then
minwidth = lastlinelength
end
totalwidth = totalwidth + lastlinelength
end
end
local hdone = false
for h in traverse_id(hlist_code,list) do -- no dir etc needed
check(h,true)
hdone = true
end
-- local vdone = false
for v in traverse_id(vlist_code,list) do -- no dir etc needed
check(v,false)
-- vdone = true
end
if not firstheight then
-- done
elseif maxwidth ~= 0 then
if hdone then
for h in traverse_id(hlist_code,list) do
local l = h.list
if l then
local subtype = h.subtype
if subtype == box_code or subtype == line_code then
h.list = hpack(l,maxwidth,'exactly',h.dir)
h.shift = 0 -- needed for display math
end
h.width = maxwidth
end
end
box.width = maxwidth -- moved
averagewidth = noflines > 0 and totalwidth/noflines or 0
end
-- if vdone then
-- for v in traverse_id(vlist_code,list) do
-- local width = n.width
-- if width > maxwidth then
-- v.width = maxwidth
-- end
-- end
-- end
box.width = maxwidth
averagewidth = noflines > 0 and totalwidth/noflines or 0
end
end
end
texsetcount("global","framednoflines",noflines)
texsetdimen("global","framedfirstheight",firstheight or 0) -- also signal
texsetdimen("global","framedlastdepth",lastdepth or 0)
texsetdimen("global","framedminwidth",minwidth)
texsetdimen("global","framedmaxwidth",maxwidth)
texsetdimen("global","framedaveragewidth",averagewidth)
end
function commands.doanalyzeframedbox(n)
local box = texgetbox(n)
local noflines = 0
local firstheight = nil
local lastdepth = nil
if box.width ~= 0 then
local list = box.list
if list then
local function check(n)
if not firstheight then
firstheight = n.height
end
lastdepth = n.depth
noflines = noflines + 1
end
for h in traverse_id(hlist_code,list) do
check(h)
end
for v in traverse_id(vlist_code,list) do
check(v)
end
end
end
texsetcount("global","framednoflines",noflines)
texsetdimen("global","framedfirstheight",firstheight or 0)
texsetdimen("global","framedlastdepth",lastdepth or 0)
end
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