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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]]--
local texsetdimen, texsetcount, texbox = tex.setdimen, tex.setcount, tex.box
local hpack, free, copy, traverse_id = node.hpack, node.free, node.copy_list, node.traverse_id
local texdimen, texcount = tex.dimen, tex.count
local hlist_code = nodes.nodecodes.hlist
local box_code = nodes.listcodes.box
local node_dimensions = node.dimensions
function commands.doreshapeframedbox(n)
local box = texbox[n]
local noflines = 0
local firstheight = nil
local lastdepth = nil
local lastlinelength = 0
local minwidth = 0
local maxwidth = 0
local totalwidth = 0
if box.width ~= 0 then
local list = box.list
if list then
for h in traverse_id(hlist_code,list) do -- no dir etc needed
if not firstheight then
firstheight = h.height
end
lastdepth = h.depth
noflines = noflines + 1
local l = h.list
if l then
if h.subtype == box_code then -- maybe more
lastlinelength = h.width
else
lastlinelength = node_dimensions(l) -- used to be: hpack(copy(l)).width
end
if lastlinelength > maxwidth then
maxwidth = lastlinelength
end
if lastlinelength < minwidth or minwidth == 0 then
minwidth = lastlinelength
end
totalwidth = totalwidth + lastlinelength
end
end
if firstheight then
if maxwidth ~= 0 then
for h in traverse_id(hlist_code,list) do
local l = h.list
if l then
if h.subtype == box_code then
-- explicit box, no 'line'
else
-- if h.width ~= maxwidth then -- else no display math handling (uses shift)
-- challenge: adapt glue_set
-- h.glue_set = h.glue_set * h.width/maxwidth -- interesting ... doesn't matter much
-- h.width = maxwidth
h.list = hpack(l,maxwidth,'exactly',h.dir)
h.shift = 0 -- needed for display math
h.width = maxwidth
-- end
end
end
end
end
box.width = maxwidth
end
end
end
-- print("reshape", noflines, firstheight or 0, lastdepth or 0)
texsetcount("global","framednoflines", noflines)
texsetdimen("global","framedfirstheight", firstheight or 0)
texsetdimen("global","framedlastdepth", lastdepth or 0)
texsetdimen("global","framedminwidth", minwidth)
texsetdimen("global","framedmaxwidth", maxwidth)
texsetdimen("global","framedaveragewidth", noflines > 0 and totalwidth/noflines or 0)
end
function commands.doanalyzeframedbox(n)
local box = texbox[n]
local noflines = 0
local firstheight = nil
local lastdepth = nil
if box.width ~= 0 then
local list = box.list
if list then
for h in traverse_id(hlist_code,list) do
if not firstheight then
firstheight = h.height
end
lastdepth = h.depth
noflines = noflines + 1
end
end
end
-- print("analyze", noflines, firstheight or 0, lastdepth or 0)
texsetcount("global","framednoflines", noflines)
texsetdimen("global","framedfirstheight", firstheight or 0)
texsetdimen("global","framedlastdepth", lastdepth or 0)
end
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