Re: Change of nuts.dimensions function ?

[Joseph Canedo <josephcanedo@gmail.com>]

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Hi Hans,
Thanks a lot, the function nuts.dimensions seems to work again as before.

Another issue I am seeing now is that for some reason the dir nodes push/pop are unbalanced. If I understand the logic of these whatsit nodes they behave like a stack to control the text direction, so I’d assume the number of push nodes and pop nodes is balanced. Currently I see 2 pop for 1 push in shipouts callback (but balanced pop/push nodes in processors callback). If that’s expected from now on I’ll change the logic in my handler.

Simple MWE that reproduces is attached.

Thanks
Best regards

Joseph

De : Hans Hagen
Envoyé le :jeudi 8 février 2018 10:14
À : ntg-context@ntg.nl
Objet :Re: [NTG-context] Change of nuts.dimensions function ?

On 2/7/2018 2:57 PM, Joseph Canedo wrote:
> Hello all,
> 
> It seems that with latest ConTeXt beta (with luatex 1.07.0) it seems 
> that nuts.dimensions function behaviour has changed. Simple MWE shows 
> the change.
> 
> Which function should be used now to get natural width of a range [n, t[ 
> of nodes please?
i'll check it but if you're on windows you're running the (currently 
very) experimental version which can actually be broken in some aspects 
(so you then need to update regularaly)

Hans


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                                           Hans Hagen | PRAGMA ADE
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\startluacode

local nuts   = nodes.nuts
local tonut  = nuts.tonut
local tonode = nuts.tonode
local getfield = nuts.getfield
local getid = nuts.getid
local getnext = nuts.getnext
local getlist = nuts.getlist

local tasks = nodes.tasks
local nodecodes = nodes.nodecodes
local traverse_id = nuts.traverse_id
local dir_code = nodecodes.dir
local hlist_code = nodecodes.hlist
local vlist_code = nodecodes.vlist

function handler(head)
   local found_dir = false
   head = tonut(head)
   for dir_node in traverse_id(dir_code, head) do
      local dir, level = getfield(dir_node, 'dir'), getfield(dir_node, 'level')
      if not found_dir then print('processor') found_dir = true end
      print('dir=' .. dir .. ' level=' .. level)
   end
   return tonode(head)
end

function list_handler(list, found_dir)
   local n = list
   while n do
      local id = getid(n)
      if id == hlist_code or id == vlist_code then list_handler(getlist(n), found_dir)
      elseif id == dir_code then
         local dir, level = getfield(n, 'dir'), getfield(n, 'level')
         if not found_dir then print('shipout') found_dir = true end
         print('dir=' .. dir .. ' level=' .. level)
      end
      n = getnext(n)
   end
end

function handler2(head)
   head = tonut(head)
   local found_dir = false
   list_handler(head, found_dir)
   return tonode(head)
end

tasks.appendaction("processors", "after", "handler")
tasks.enableaction("processors", "handler")

tasks.appendaction("shipouts", "after", "handler2")
tasks.enableaction("shipouts", "handler2")

\stopluacode

\starttext

Foo {\setupalign[r2l]Right to left} Bar.

Foo {\setupalign[r2l]Right {\setupalign[l2r]Left again} Right} Bar.

\stoptext

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