+local node_new = node.new
+local id_whatsit = node.id('whatsit')
+local sid_user = node.subtype('user_defined')
+
+local charprop_stack_table={}; charprop_stack_table[0]={}
+
+function get_stack_level()
+ local i = tex.getcount('ltj@@stack')
+ local j = tex.currentgrouplevel
+ if j > tex.getcount('ltj@@group@level') then
+ i = i+1 -- new stack level
+ tex.setcount('ltj@@group@level', j)
+ for k,v in pairs(charprop_stack_table) do -- clear the stack above i
+ if k>=i then charprop_stack_table[k]=nil end
+ end
+ charprop_stack_table[i] = table.fastcopy(charprop_stack_table[i-1])
+ tex.setcount('ltj@@stack', i)
+ local g = node_new(id_whatsit, sid_user)
+ g.user_id=30112; g.type=100; g.value=j; node.write(g)
+ end
+ return i
+end
+
+-- EXT
+function set_stack_table(g,m,c,p,lb,ub)
+ local i = get_stack_level()
+ if p<lb or p>ub then
+ ltj.error('Invalid code (' .. p .. '), should in the range '
+ .. tostring(lb) .. '..' .. tostring(ub) .. '.',
+ {"I'm going to use 0 instead of that illegal code value."})
+ p=0
+ elseif c<-1 or c>0x10FFFF then
+ ltj.error('Invalid character code (' .. c
+ .. '), should in the range -1.."10FFFF.',{})
+ return
+ elseif not charprop_stack_table[i][c] then
+ charprop_stack_table[i][c] = {}
+ end
+ charprop_stack_table[i][c][m] = p
+ if g=='global' then
+ for j,v in pairs(charprop_stack_table) do
+ if not charprop_stack_table[j][c] then charprop_stack_table[j][c] = {} end
+ charprop_stack_table[j][c][m] = p
+ end
+ end
+end
+
+-- EXT: store \ltj@tempskipa
+function set_stack_skip(g,c)
+ local i = get_stack_level()
+ local sp = tex.getskip('ltj@tempskipa')
+ if not charprop_stack_table[i][c] then
+ charprop_stack_table[i][c] = {}
+ end
+ charprop_stack_table[i][c].width = sp.width
+ charprop_stack_table[i][c].stretch = sp.stretch
+ charprop_stack_table[i][c].shrink = sp.shrink
+ charprop_stack_table[i][c].stretch_order = sp.stretch_order
+ charprop_stack_table[i][c].shrink_order = sp.shrink_order
+ if g=='global' then
+ for j,v in pairs(charprop_stack_table) do
+ if not charprop_stack_table[j][c] then charprop_stack_table[j][c] = {} end
+ charprop_stack_table[j][c].width = sp.width
+ charprop_stack_table[j][c].stretch = sp.stretch
+ charprop_stack_table[j][c].shrink = sp.shrink
+ charprop_stack_table[j][c].stretch_order = sp.stretch_order
+ charprop_stack_table[j][c].shrink_order = sp.shrink_order
+ end
+ end
+end
+
+-- mode: nil iff it is called in callbacks
+function get_skip_table(m, idx)
+ local i = charprop_stack_table[idx][m]
+ return i or { width = 0, stretch = 0, shrink = 0,
+ stretch_order = 0, shrink_order = 0 }
+end
+
+function get_penalty_table(m,c,d, idx)
+ local i = charprop_stack_table[idx][c]
+ if i then i=i[m] end
+ return i or d
+end