-\usepackage{amsmath,luacode,xcolor}
-\begin{luacode}
- lineskip = {}
-do
- local insert = table.insert
- local rangedimensions, max = node.rangedimensions, math.max
- function lineskip.p_profile(before, after)
- local t = {}
- do
- local w_acc, d_before = 0, 0
- local x = before.head; local xn = x.next
- while x do
- local w, d
- if xn then w, _, d= rangedimensions(before,x,xn)
- else w, _, d= rangedimensions(before,x) end
- if d~=d_before then
- d_before = d; t[w_acc] = t[w_acc] or {}
- if t[w_acc][1] then t[w_acc][1]=max(t[w_acc][1],d)
- else t[w_acc][1]=d end
- end
- w_acc = w_acc + w
- x = xn; if x then xn = x.next end
- end
- end
- do
- local w_acc, h_before = 0, 0
- local x = after.head; local xn = x.next
- while x do
- local w, h
- if xn then w, h = rangedimensions(after,x,xn)
- else w, h = rangedimensions(after,x) end
- if h~=h_before then
- h_before = h; t[w_acc] = t[w_acc] or {}
- if t[w_acc][2] then t[w_acc][2]=max(t[w_acc][2],h)
- else t[w_acc][2]=h end
- end
- w_acc = w_acc + w
- x = xn; if x then xn = x.next end
- end
- end
- local t2 = {}
- for i,v in pairs(t) do insert(t2, { i, v[1], v[2] } ) end
- table.sort(t2, function(a,b) return a[1]<b[1] end)
- do
- local bls = tex.baselineskip.width
- local dmax, d, hmax, h, lmin = 0, 0, 0, 0, 1/0
- for i,v in ipairs(t2) do
- d, h = (v[2] or d), (v[3] or h)
- if d>dmax then dmax=d end
- if h>hmax then hmax=h end
- if (bls-h-d)<lmin then lmin=bls-h-d end
- end
- if lmin==1/0 then lmin = 0 end
- return lmin, bls - lmin - (before.depth+after.height)
- end
- end
- function lineskip.p_dummy(before, after)
- return nil, 0
- end
-end
-do
- local setglue = node.setglue
- local floor, max = math.floor, math.max
- function lineskip.l_dummy(dist, g, adj, normal)
- if dist < tex.lineskiplimit then
- local ng = tex.lineskip; g.subtype=1
- setglue(g, ng.width + adj, ng.stretch, ng.shrink, ng.stretch_order, ng.shrink_order)
- else
- local ng = tex.baselineskip; g.subtype=2
- setglue(g, normal, ng.stretch, ng.shrink, ng.stretch_order, ng.shrink_order)
- end
- end
- function lineskip.l_step(dist, g, adj, normal)
- if dist < tex.lineskiplimit then
- local ng = tex.baselineskip; g.subtype=1
- local f = max(1,ng.width*lineskip.step_factor)
- setglue(g,
- normal - f * floor((dist-tex.lineskip.width)/f),
- ng.stretch, ng.shrink, ng.stretch_order, ng.shrink_order)
- else
- local ng = tex.baselineskip; g.subtype=2
- setglue(g, normal, ng.stretch, ng.shrink, ng.stretch_order, ng.shrink_order)
- end
- end
-end
-
- local l_profiler, l_skip = lineskip.p_dummy, lineskip.l_dummy
- function lineskip.setting(profiler, skip_method)
- l_profiler = lineskip['p_'..tostring(profiler)] or lineskip.p_dummy
- l_skip = lineskip['l_'..tostring(skip_method)] or lineskip.l_dummy
- end
-
-do
- luatexbase.add_to_callback('post_linebreak_filter',
- function(h)
- for x in node.traverse_id(12, h) do
- if (x.subtype==1)or(x.subtype==2)then
- local p, n = x.prev, x.next
- if p then
- while ((p.id==14)or(p.id==12)or(p.id==13)) and p.prev do p = p.prev end
- if p.id==0 and n.id==0 then
- local normal = tex.baselineskip.width - p.depth - n.height
- local lmin, adj; lmin, adj = l_profiler(p,n)
- l_skip(lmin or normal,x,adj, normal)
- end
- end
- end
- end
- return true
- end, 'test', 10000
- )
-end
-
-do
- local to_direct, to_node = node.direct.todirect, node.direct.tonode
- local make_dir_whatsit = luatexja.direction.make_dir_whatsit
- local get_dir_count = luatexja.direction.get_dir_count
- local function lineskip_append_vlist(b, loc, prev, mirrored)
- local new_b = to_node(loc=='box' and
- make_dir_whatsit(to_direct(b), to_direct(b), get_dir_count(), 'append_vlist')) or b
- local tail = tex.nest[tex.nest.ptr].tail
- if tail and tail.id==12 and tail.subtype==3 then
- tail = tail.prev
- end
- if tail and (prev > -65536000) then
- local normal = tex.baselineskip.width - prev - new_b.height
- local lmin, adj = nil, 0;
- if tail.id==0 and new_b.id==0 then
- if tail.depth==prev then lmin, adj = l_profiler(tail,new_b) end
- end
- local g = node.new(12); l_skip(lmin or normal, g, adj, normal)
- node.write(g)
- end
- node.write(new_b)
- tex.prevdepth = new_b.depth
- return nil -- do nothing on tex side
- end
- luatexbase.remove_from_callback('append_to_vlist_filter','ltj.direction')
- luatexja.base.add_to_callback('append_to_vlist_filter',
- lineskip_append_vlist,
- 'line profile', 10000)
-end
-\end{luacode}
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