[FriBidi] Mixed RTL and numeric strings

Behnam Esfahbod behnam at zwnj.org
Tue May 14 15:05:31 PDT 2013 

Ian,

For the top-level API, there's a one-to-one mapping between the characters
of the input string and ones on the output string: no characters removed,
no new characters inserted, they just move around.

Hope it answers your question.
-BehNaM



On Tue, May 14, 2013 at 12:03 PM, Ian Walberg <ian.walberg at airborne.aero>wrote:

> Behdad,
>
> Agreed that we should be using Pango etc but until that is implemented we
> are trying a few work arounds.
>
> This is for the mapserv label rendering in the mapstring.c file.
>
> The question we have is are the RLE, RLM etc codes removed from the
> returned string or do we need to strip them before the processed text is
> rendered?
>
> Thanks
>
> Ian
>
> -----Original Message-----
> From: Behdad Esfahbod [mailto:behdad.esfahbod at gmail.com] On Behalf Of
> Behdad Esfahbod
> Sent: Monday, May 13, 2013 3:39 PM
> To: Ian Walberg
> Cc: Khaled Hosny; FriBidi
> Subject: Re: [FriBidi] Mixed RTL and numeric strings
>
> Do you have code you can show us?  I'm not even sure what you are trying
> to do.  You should be using a full-fledged text layout system like Pango.
>
> On 13-05-13 05:50 PM, Ian Walberg wrote:
> > So using notepad on windows we have been able to insert the LTE code
> rather than using a hex editor which is much more practical.
> >
> > However when displaying the labels on mapserver we are still getting
> boxes (I assume unrecognized characters) displayed.
> >
> > The question now is do the non-displaying characters need removing from
> the returned string before rendering?
> >
> > Thanks
> >
> > Ian
> >
> > -----Original Message-----
> > From: fribidi-bounces+ian.walberg=airborne.aero at lists.freedesktop.org
> > [mailto:fribidi-bounces+ian.walberg=airborne.aero at lists.freedesktop.or
> > g] On Behalf Of Ian Walberg
> > Sent: Wednesday, April 17, 2013 3:50 PM
> > To: Behdad Esfahbod; Khaled Hosny
> > Cc: FriBidi
> > Subject: Re: [FriBidi] Mixed RTL and numeric strings
> >
> > Ok we have rather awkwardly inserted the hex codes for LTE and PDF
> around the -32 in our arabic text for -32 degrees from google translate.
> >
> > This now displays the characters as we believe they should be and the
> minus sign to the left (-32) instead of the right (32-).
> >
> > We are getting a couple of boxes displayed which I assume are bad
> characters we have entered when doing the hex edit.
> >
> > However my question now is how do with do this in a way that normal none
> hex editing humans can understand?
> >
> > Thanks
> >
> > Ian
> >
> > -----Original Message-----
> > From: Ian Walberg
> > Sent: Wednesday, April 17, 2013 2:43 PM
> > To: 'Behdad Esfahbod'; Khaled Hosny
> > Cc: FriBidi
> > Subject: RE: [FriBidi] Mixed RTL and numeric strings
> >
> > Behdad,
> >
> > Ok good .....
> >
> > What we have been requested to do is always put the minus sign on the
> left hand side of the number (12345) digits even when the left is RTL.
> >
> > We are experimenting with combinations of characters this afternoon but
> are not sure what might work or if this is even possible. Currently we
> always see the minus sign on the right hand side when the test is RTL.
> >
> > Many thanks
> >
> > Ian
> >
> > -----Original Message-----
> > From: Behdad Esfahbod [mailto:behdad.esfahbod at gmail.com] On Behalf Of
> > Behdad Esfahbod
> > Sent: Wednesday, April 17, 2013 2:35 PM
> > To: Khaled Hosny
> > Cc: Ian Walberg; FriBidi
> > Subject: Re: [FriBidi] Mixed RTL and numeric strings
> >
> > Snap.  That's exactly why U+066x digits and U+06Fx digits have different
> types.  So, MINUS SIGN is supposed to work both for Arabic and Persian
> digits.
> >
> > b
> >
> > On 13-04-17 05:31 PM, Khaled Hosny wrote:
> >> For RTL text I expect the minus to be on the right (OK, I was taught
> >> math in from right to left using Arabic notation), so Unicode/FriBiDi
> >> are doing the right thing, so what you want here is to treat math
> >> expressions as being “isolated” LTR, so you should enclose them in
> >> LRE and PDF marks (U+202A and U+202C, respectively).
> >>
> >> Regards,
> >> Khaled
> >>
> >> On Wed, Apr 17, 2013 at 05:21:11PM -0400, Ian Walberg wrote:
> >>> Behdad,
> >>>
> >>> Let us try that, we do need to mix number (12345) and Arabic/Hebrew
> text with the minus sign.
> >>>
> >>> Thanks
> >>>
> >>> Ian
> >>>
> >>> -----Original Message-----
> >>> From: Behdad Esfahbod [mailto:behdad.esfahbod at gmail.com] On Behalf
> >>> Of Behdad Esfahbod
> >>> Sent: Wednesday, April 17, 2013 2:18 PM
> >>> To: Ian Walberg
> >>> Cc: FriBidi
> >>> Subject: Re: [FriBidi] Mixed RTL and numeric strings
> >>>
> >>> On 13-04-17 05:10 PM, Ian Walberg wrote:
> >>>> Behdad,
> >>>>
> >>>> That seems to give the same result.
> >>>>
> >>>> Can you send me a utf8 string that you think should work with a minus
> sign?
> >>>
> >>> How about this:
> >>>
> >>> −۳۲ بهداد
> >>>
> >>> b
> >>>
> >>>> Thanks
> >>>>
> >>>> Ian
> >>>>
> >>>>
> >>>> -----Original Message-----
> >>>> From:
> >>>> fribidi-bounces+ian.walberg=airborne.aero at lists.freedesktop.org
> >>>> [mailto:fribidi-bounces+ian.walberg=airborne.aero at lists.freedesktop.
> >>>> or
> >>>> g] On Behalf Of Ian Walberg
> >>>> Sent: Wednesday, April 17, 2013 1:54 PM
> >>>> To: Behdad Esfahbod
> >>>> Cc: FriBidi
> >>>> Subject: Re: [FriBidi] Mixed RTL and numeric strings
> >>>>
> >>>> Behdad,
> >>>>
> >>>> Ok great, how do we insert that? Say using a text editor? We use
> ultra edit.
> >>>>
> >>>> Thanks
> >>>>
> >>>> Ian
> >>>>
> >>>> -----Original Message-----
> >>>> From: Behdad Esfahbod [mailto:behdad.esfahbod at gmail.com] On Behalf
> >>>> Of Behdad Esfahbod
> >>>> Sent: Wednesday, April 17, 2013 1:49 PM
> >>>> To: Ian Walberg
> >>>> Cc: FriBidi
> >>>> Subject: Re: Mixed RTL and numeric strings
> >>>>
> >>>> I think the easiest way to fix this is to use U+2212 MINUS SIGN
> instead of ASCII HYPHEN-MINUS.
> >>>>
> >>>> behdad
> >>>>
> >>>> On 13-04-16 07:45 PM, Ian Walberg wrote:
> >>>>> Behdad,
> >>>>>
> >>>>>
> >>>>>
> >>>>> Below is the image from mapserver and the text copied from the
> >>>>> sqlite database (attached).
> >>>>>
> >>>>>
> >>>>>
> >>>>> Regards
> >>>>>
> >>>>>
> >>>>>
> >>>>> Ian
> >>>>>
> >>>>>
> >>>>>
> >>>>> -32 درجة حرارة الهواء
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>> -----Original Message-----
> >>>>> From: Behdad Esfahbod [mailto:behdad.esfahbod at gmail.com] On Behalf
> >>>>> Of Behdad Esfahbod
> >>>>> Sent: Tuesday, April 16, 2013 12:49 PM
> >>>>> To: Ian Walberg
> >>>>> Cc: FriBidi
> >>>>> Subject: Re: Mixed RTL and numeric strings
> >>>>>
> >>>>>
> >>>>>
> >>>>> On 13-04-16 11:23 AM, Ian Walberg wrote:
> >>>>>
> >>>>>> Behdad,
> >>>>>
> >>>>>>
> >>>>>
> >>>>>> We are using mapserver and need to display mixed RTL text and
> >>>>>> numeric
> >>>>>
> >>>>>> data.
> >>>>>
> >>>>>>
> >>>>>
> >>>>>> The numeric data displays the minus sign after the string 123-
> >>>>>> rather
> >>>>>
> >>>>>> than -123 as we would like.
> >>>>>
> >>>>>>
> >>>>>
> >>>>>> Is it possible to make the minus sign appear before the numbers?
> >>>>>
> >>>>>
> >>>>>
> >>>>> Show me the code?
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>> Many thanks
> >>>>>
> >>>>>>
> >>>>>
> >>>>>> Ian
> >>>>>
> >>>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>> --
> >>>>>
> >>>>> behdad
> >>>>>
> >>>>> http://behdad.org/
> >>>>>
> >>>>
> >>>> --
> >>>> behdad
> >>>> http://behdad.org/
> >>>> _______________________________________________
> >>>> fribidi mailing list
> >>>> fribidi at lists.freedesktop.org
> >>>> http://lists.freedesktop.org/mailman/listinfo/fribidi
> >>>>
> >>>
> >>> --
> >>> behdad
> >>> http://behdad.org/
> >>> _______________________________________________
> >>> fribidi mailing list
> >>> fribidi at lists.freedesktop.org
> >>> http://lists.freedesktop.org/mailman/listinfo/fribidi
> >>
> >
> > --
> > behdad
> > http://behdad.org/
> > _______________________________________________
> > fribidi mailing list
> > fribidi at lists.freedesktop.org
> > http://lists.freedesktop.org/mailman/listinfo/fribidi
> >
>
> --
> behdad
> http://behdad.org/
> _______________________________________________
> fribidi mailing list
> fribidi at lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/fribidi
>



-- 
Behnam Esfahbod | بهنام اسفهبد
http://behnam.es/
GPG-FP: 3E7F B4B6 6F4C A8AB 9BB9 7520 5701 CA40 259E 0F8B
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