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From Jeremias Maerki <...@jeremias-maerki.ch>
Subject Re: Error message: "Should be first"
Date Mon, 10 Jul 2006 19:48:57 GMT
Argh, sorry guys. I should have thought about that. Attached is the font
metrics file of the "i_helvetica" font (a TrueType fonts).

Here's my font triplet (don't need the actual TrueType font to reproduce
I think):
<font metrics-url="i_helvetica.xml" kerning="yes">
  <font-triplet name="i_helvetica" style="normal" weight="normal"/>
</font>



On 10.07.2006 21:17:46 Simon Pepping wrote:
> On Mon, Jul 10, 2006 at 07:06:23PM +0200, Vincent Hennebert wrote:
> > >One of my clients reported to me that he gets a "Should be first"
> > >error
> > >message on the log. This happens in (Page)BreakingAlgorithm.removeNode().
> > >I get the impression that the code there is not finished rather than
> > >that is a real error condition. I'll try to extend removeNode() so it
> > >really removes the disabled node.
> > >
> > >See the attached demo file (You'll need italian hyphenation available to
> > >get the error).
> > >
> > >I'll try to fix that tomorrow. If Luca or anyone else has any further 
> > >comments
> > >on that, I'd appreciate it.
> > 
> > I don't have any error with this file. However, I've had to change the
> > font names because i_helvetica is unknown. I've tried with Helvetica and
> > Helvetica + font-style="italic" (as I suppose is what the "i_" means)
> > but I still don't get any error. How did you get it?
> > 
> > Regarding the "should be first" error, that's a part of the algorithm
> > I don't completely understand, yet. That said, the removeNode method is
> > called, among other places, in filterActiveNodes. This is only a guess,
> > but if there is a place where the removeNode's "precondition" isn't
> > respected, that might be here.
> 
> I could not reproduce the problem either. When looking at the code, it
> is not clear to me why one would expect the removed node to be the
> first in the list. I am surprised that this error does not occur more
> often. I must be overlooking something.


Jeremias Maerki

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