[Dev-luatex] Traversing node list

[Khaled Hosny]

I'm wondering why, in the following code, the first \hbox{} is not seen
by the lua function while the second one is seen i.e. \hbox{} at
paragraph beginning isn't seen.

\directlua0{
local function traverse(h)
  for n in node.traverse (h)
    do texio.write_nl('node id='..node.type(n.id))
    if n.id == node.id('hlist') then
      traverse(n.list)
    end
  end
end
callback.register('pre_linebreak_filter',
  function(h)
    traverse(h)
    return true
  end
)
}

\hbox{Not seen}

Hello \hbox{seen}
\bye

Regards,

-- 
 Khaled Hosny
 Arabic localizer and member of Arabeyes.org team
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