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if not modules then modules = { } end modules ['node-scn'] = {
version = 1.001,
comment = "companion to node-ini.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local floor = math.floor
local attributes = attributes
local nodes = nodes
local nuts = nodes.nuts
local getnext = nuts.getnext
local getprev = nuts.getprev
local getid = nuts.getid
local getattr = nuts.getattr
local getsubtype = nuts.getsubtype
local getlist = nuts.getlist
local setlist = nuts.setlist
local end_of_math = nuts.end_of_math
local nodecodes = nodes.nodecodes
local gluecodes = nodes.gluecodes
local kerncodes = nodes.kerncodes
local glyph_code = nodecodes.glyph
local disc_code = nodecodes.disc
local rule_code = nodecodes.rule
local boundary_code = nodecodes.boundary
local dir_code = nodecodes.dir
local math_code = nodecodes.math
local glue_code = nodecodes.glue
local penalty_code = nodecodes.penalty
local kern_code = nodecodes.kern
local hlist_code = nodecodes.hlist
local vlist_code = nodecodes.vlist
local userskip_code = gluecodes.userskip
local spaceskip_code = gluecodes.spaceskip
local xspaceskip_code = gluecodes.xspaceskip
local leaders_code = gluecodes.leaders
local fontkern_code = kerncodes.fontkern
local variables = interfaces.variables
local privateattributes = attributes.private
local a_runningtext = privateattributes('runningtext')
local v_yes = variables.yes
local v_all = variables.all
local function striprange(first,last) -- todo: dir
if first and last then -- just to be sure
if first == last then
return first, last
end
while first and first ~= last do
local id = getid(first)
if id == glyph_code or id == disc_code or id == dir_code or id == boundary_code then -- or id == rule_code
break
else
first = getnext(first)
end
end
if not first then
return nil, nil
elseif first == last then
return first, last
end
while last and last ~= first do
local id = getid(last)
if id == glyph_code or id == disc_code or id == dir_code or id == boundary_code then -- or id == rule_code
break
else
local prev = getprev(last) -- luatex < 0.70 has italic correction kern not prev'd
if prev then
last = prev
else
break
end
end
end
if not last then
return nil, nil
end
end
return first, last
end
nuts.striprange = striprange
-- todo: order and maybe other dimensions
-- we can use this one elsewhere too
--
-- todo: functions: word, sentence
--
-- glyph rule unset whatsit glue margin_kern kern math disc
-- we assume {glyphruns} and no funny extra kerning, ok, maybe we need
-- a dummy character as start and end; anyway we only collect glyphs
--
-- this one needs to take layers into account (i.e. we need a list of
-- critical attributes)
-- omkeren class en level -> scheelt functie call in analyze
-- todo: switching inside math
-- handlers
local function processwords(attribute,data,flush,head,parent,skip) -- we have hlistdir and local dir
local n = head
if n then
local f, l, a, d, i, class
local continue, leaders, done, strip, level = false, false, false, true, -1
while n do
local id = getid(n)
if id == glyph_code or id == rule_code or (id == hlist_code and getattr(n,a_runningtext)) then
local aa = getattr(n,attribute)
if aa and aa ~= skip then
if aa == a then
if not f then -- ?
f = n
end
l = n
else
-- possible extensions: when in same class then keep spanning
local newlevel, newclass = floor(aa/1000), aa%1000 -- will be configurable
-- strip = not continue or level == 1 -- 0
if f then
if class == newclass then -- and newlevel > level then
head, done = flush(head,f,l,d,level,parent,false), true
else
head, done = flush(head,f,l,d,level,parent,strip), true
end
end
f, l, a = n, n, aa
level, class = newlevel, newclass
d = data[class]
if d then
local c = d.continue
leaders = c == v_all
continue = leaders or c == v_yes
else
continue = true
end
end
else
if f then
head, done = flush(head,f,l,d,level,parent,strip), true
end
f, l, a = nil, nil, nil
end
if id == hlist_code then
local list = getlist(n)
if list then
setlist(n,(processwords(attribute,data,flush,list,n,aa))) -- watch ()
end
end
elseif id == disc_code or id == boundary_code then
if f then
l = n
end
elseif id == kern_code and getsubtype(n) == fontkern_code then
if f then
l = n
end
elseif id == math_code then
-- otherwise not consistent: a $b$ c vs a $b+c$ d etc
-- we need a special (optional) go over math variant
if f then
head, done = flush(head,f,l,d,level,parent,strip), true
f, l, a = nil, nil, nil
end
elseif id == hlist_code or id == vlist_code then
if f then
head, done = flush(head,f,l,d,level,parent,strip), true
f, l, a = nil, nil, nil
end
local list = getlist(n)
if list then
setlist(n,(processwords(attribute,data,flush,list,n,skip))) -- watch ()
end
elseif id == dir_code then -- only changes in dir, we assume proper boundaries
if f then
l = n
end
elseif f then
if continue then
if id == penalty_code then
l = n
-- elseif id == kern_code then
-- l = n
elseif id == glue_code then
-- catch \underbar{a} \underbar{a} (subtype test is needed)
local subtype = getsubtype(n)
if getattr(n,attribute) and (subtype == userskip_code or subtype == spaceskip_code or subtype == xspaceskip_code or (leaders and subtype >= leaders_code)) then
l = n
else
head, done = flush(head,f,l,d,level,parent,strip), true
f, l, a = nil, nil, nil
end
end
else
head, done = flush(head,f,l,d,level,parent,strip), true
f, l, a = nil, nil, nil
end
end
n = getnext(n)
end
if f then
head, done = flush(head,f,l,d,level,parent,strip), true
end
return head, true -- todo: done
else
return head, false
end
end
nuts.processwords = function(attribute,data,flush,head,parent) -- we have hlistdir and local dir
return processwords(attribute,data,flush,head,parent)
end
-- works on lines !
-- todo: stack because skip can change when nested
local function processranges(attribute,flush,head,parent,depth,skip)
local n = head
if n then
local f, l, a
local done = false
while n do
local id = getid(n)
if id == glyph_code or id == rule_code then
local aa = getattr(n,attribute)
-- if aa and (not skip or aa ~= skip) then
if aa then
if aa == a then
if not f then
f = n
end
l = n
else
if f then
head, done = flush(head,f,l,a,parent,depth), true
end
f, l, a = n, n, aa
end
else
if f then
head, done = flush(head,f,l,a,parent,depth), true
end
f, l, a = nil, nil, nil
end
elseif id == disc_code or id == boundary_code then
if f then
l = n
else
-- weird
end
elseif id == kern_code and getsubtype(n) == fontkern_code then
if f then
l = n
end
-- elseif id == penalty_code then
elseif id == glue_code then
-- todo: leaders
elseif id == hlist_code or id == vlist_code then
local aa = getattr(n,attribute)
-- if aa and (not skip or aa ~= skip) then
if aa then
if aa == a then
if not f then
f = n
end
l = n
else
if f then
head, done = flush(head,f,l,a,parent,depth), true
end
f, l, a = n, n, aa
end
else
if f then
head, done = flush(head,f,l,a,parent,depth), true
end
f, l, a = nil, nil, nil
end
local list = getlist(n)
if list then
setlist(n,(processranges(attribute,flush,list,n,depth+1,aa)))
end
end
n = getnext(n)
end
if f then
head, done = flush(head,f,l,a,parent,depth), true
end
return head, done
else
return head, false
end
end
nuts.processranges = function(attribute,flush,head,parent) -- we have hlistdir and local dir
return processranges(attribute,flush,head,parent,0)
end
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