[liblouis-liblouisxml] Re: digit vs. litdigit
- From: "John J. Boyer" <john.boyer@xxxxxxxxxxxxxxxxx>
- To: liblouis-liblouisxml@xxxxxxxxxxxxx
- Date: Sun, 2 Dec 2012 18:51:32 -0600
The digit and litdigit opcodes are explained in the liblouis
documentation. digit gives the dot pattern to be used in cimputer
Braille. litdigit gives the dot pattern to be used in literary Braille.
John
On Sun, Dec 02, 2012 at 11:02:38PM +0100, Mesar Hameed
wrote:
> Hi John B,
>
> I would also be grateful for a clarification on this issue.
> Unfortunately I personally don't have any time to investigate this anytime
> soon.
>
> Thanks,
> Mesar
> On Tue 27/11/12,14:30, Peter Lundblad wrote:
> > Hi,
> >
> > I am looking at some grade 1 tables for back translation (using liblouis
> > 2.5.1).
> > I am seeing the problem that digits are confused for the first ten latin
> > alphabet letters. This happens in a few tables, but let's use
> > Se-Se-g1.utb as an example.
> >
> > Translating e.g.:
> > Hello 123 hello.
> > to braille works properly. Backtranslating the result (I use lou_allround)
> > gives
> > 85llo 123 85llo.
> >
> > As you can see, the letters a-j get interpreted as
> > numbers despite not being preceded with a numsign.
> >
> > Now, the Swedish table includes digits6Dots.uti with lines
> > like
> > digit 0 245
> > There are no litdigit lines in this table.
> >
> > This is obviously not correct, and I actually wonder if most tables
> > that include digits6Dot and also latinLetterDef6Dots.uti do so
> > in error, since it causes this conflict.
> >
> > Changing to use litdigit fixes backtranslation for letters, but now
> > there are no numsigns being output on forward translation.
> > So it seems that we need digit lines to define the characters
> > as digits and litdigit lines to not confuse digits and letters on
> > back translations. I see other tables that do this, but then it seems
> > like we ned to find 10 unused braille patterns to not conflict.
> > I could get around this by having lines like
> > noback digit 1 1
> > litdigit 1 1
> > ...
> >
> > I am not entirely sure about the interaction between digit, litdigit and
> > other characters. Does anyone have a suggestion for how to
> > fix backtranslation for Swedish and other tables that have this problem?
> > (I've tested with the Polish grade 1 table, and, even if I am not familiar
> > with Polish, it seems pretty obvious that backtranslation is broken
> > in a similar way there as well.)
> >
> > Thanks,
> > //Peter
> > For a description of the software, to download it and links to
> > project pages go to http://www.abilitiessoft.com
> For a description of the software, to download it and links to
> project pages go to http://www.abilitiessoft.com
--
John J. Boyer; President, Chief Software Developer
Abilitiessoft, Inc.
http://www.abilitiessoft.com
Madison, Wisconsin USA
Developing software for people with disabilities
For a description of the software, to download it and links to
project pages go to http://www.abilitiessoft.com
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