Issue in fribidi2 with implicit base direction?

[Praveen Patil]

Hi All,

 

I have built fribidi2 on an embedded platform and testing it. I have noticed that if the input string to fribidi_log2vis() is an English text with embedded Arabic (or Hebrew) string and pbase_dir=FRIBIDI_TYPE_N, the resulting visual_str base direction is set to right-to-left, instead of left-to-right.

 

Below the latin text is in ascii and the arabic code is printed in Unicode hex.

 

(1)str to fribidi_log2vis() - "Yusuf Dadani in Arabic is [064A][064A][0648][0633][0641] [062F][0627][062F][0627][06
46][064A] ok?"

(2)Actual visual_str - "ok [FEF2][FEE7][FE8D][FEA9][FE8D][FEA9] [FED2][FEB3][FEEE][FEF4][FEF3] Yusuf Dadani in
 Arabic is"

(3)I Expected visual_str - "Yusuf Dadani in Arabic is [FEF2][FEE7][FE8D][FEA9][FE8D][FEA9] [FED2][FEB3][FEEE][FEF4]
[FEF3] ok?"

 

You can see that the Actual visual_str seems to have the problem. The fribidi I used earlier (1999/2000) provides the expected visual string (tested with Hebrew).

 

Are you aware of this issue? I could resolve the problem by explicitly setting pbase_dir to FRIBIDI_TYPE_L when string starts out with Latin character, but wondering if there is an issue with implicit base ordering.

 

Thanks,

Praveen

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[Behdad Esfahbod-3]

On Tue, 2006-11-07 at 16:29 -0500, Praveen Patil wrote:

> Hi All,
>  
> I have built fribidi2 on an embedded platform and testing it. I have
> noticed that if the input string to fribidi_log2vis() is an English
> text with embedded Arabic (or Hebrew) string and
> pbase_dir=FRIBIDI_TYPE_N, the resulting visual_str base direction is
> set to right-to-left, instead of left-to-right.
>  
> Below the latin text is in ascii and the arabic code is printed in
> Unicode hex.
>  
> (1)str to fribidi_log2vis() - "Yusuf Dadani in Arabic is
> [064A][064A][0648][0633][0641] [062F][0627][062F][0627][06
> 46][064A] ok?"
> (2)Actual visual_str - "ok [FEF2][FEE7][FE8D][FEA9][FE8D][FEA9]
> [FED2][FEB3][FEEE][FEF4][FEF3] Yusuf Dadani in
>  Arabic is"
> (3)I Expected visual_str - "Yusuf Dadani in Arabic is
> [FEF2][FEE7][FE8D][FEA9][FE8D][FEA9] [FED2][FEB3][FEEE][FEF4]
> [FEF3] ok?"
>  
> You can see that the Actual visual_str seems to have the problem. The
> fribidi I used earlier (1999/2000) provides the expected visual string
> (tested with Hebrew).
>  
> Are you aware of this issue? I could resolve the problem by explicitly
> setting pbase_dir to FRIBIDI_TYPE_L when string starts out with Latin
> character, but wondering if there is an issue with implicit base
> ordering.

No, this is not expected.  Can you reproduce it using the fribidi
commandline tool and pass me the test case?

Thanks
behdad

 
> Thanks,
> Praveen
> _______________________________________________
> fribidi mailing list
> fribidi@...
> http://lists.freedesktop.org/mailman/listinfo/fribidi
--
behdad
http://behdad.org/

"Commandment Three says Do Not Kill, Amendment Two says Blood Will Spill"
        -- Dan Bern, "New American Language"

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