Re: [NTG-context] wrong behaviour with ConTeXt unicode bidi

2013-09-12 Thread Vafa Khalighi
There is one more problem with the default method:

\starttext

\setupalign[r2l]

\definefont[arabicfont][Arial*arabic at 20pt]



\setupdirections[bidi=global,method=default]


1.


\stoptext


from right to left perspective it prints 1. (dot after digit 1) as .1
(dot before digit 1) however method one and two work correctly.


On Thu, Sep 12, 2013 at 3:10 AM, Hans Hagen pra...@wxs.nl wrote:

 On 9/11/2013 5:24 PM, Khaled Hosny wrote:

 On Wed, Sep 11, 2013 at 02:37:35PM +0200, Hans Hagen wrote:

 anyway, it would be nice to see where the three methods fail:


 Of the three, method one seems to give correct results on all the given
 tests (I’m yet to test with my own documents).

 I’m skeptical that bidi can be implemented in a one pass algorithm,
 there have been a one pass algorithm called “Pretty Good Bidi
 Algorithm”, but it has its limitation (I never tested it myself).


 Sure, although it can be close to okay with some backward and forward
 scanning but I'm nbot really in the mood for that now. Anyhow, for the
 occasional mix of arabic and latin this method works ok. For more extreme
 cases method 'one' will do and method 'two' ... well it depends on
 developments in unicode as this method will be the more configurable one.
 (And I can probably make a faster implementation of method two when
 performance matters.)


 Hans


 --**--**-
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 tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
  | www.pragma-pod.nl
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Re: [NTG-context] wrong behaviour with ConTeXt unicode bidi

2013-09-11 Thread Vafa Khalighi
I tried the latest beta; it fixes the problem I mentioned but breaks
something else:

\starttext

\setupalign[r2l]

\definefont[arabicfont][Arial*arabic at 20pt]



\setupdirections[bidi=global,method=default]
\hbox dir TRT{\arabicfont  (1984)}


\stoptext

If you have \hbox dir TLT, you get expected result. I am not sure if this
is the side effect of using \hbox dir TRT.



On Wed, Sep 11, 2013 at 2:20 AM, Vafa Khalighi persian-...@tug.org wrote:

 Sorry that is not fixed. If you type two of these, the second one will be
 broken.

 \starttext

 \setupalign[r2l]

 \definefont[arabicfont][Arial*arabic at 20pt]



 \setupdirections[bidi=global,method=default] \arabicfont

 این (آزمایش 1363) و
 یک (آزمایش 1984) خوب
  است  و باقی ماجرا.


 \stoptext


 Vafa Khalighi


 On Wed, Sep 11, 2013 at 1:45 AM, Vafa Khalighi persian-...@tug.orgwrote:

 Thanks. That is now fixed.


 On Wed, Sep 11, 2013 at 1:26 AM, Hans Hagen pra...@wxs.nl wrote:

 On 9/10/2013 2:57 PM, Vafa Khalighi wrote:

 Hi

 The following document shows the wrong behaviour (the second parentheses
 is mirrored incorrectly and it should be after the number not before the
 number).

 Assuming test is an RTL word when I write (test 1363) I expect to get
 exactly that but somehow I get (test (1363


 new beta ... also with fix for issue khaled mentioned

 \starttext

 \setupalign[r2l]

 \definefont[arabicfont][Arial***arabic at 20pt]

 \enabletrackers[typesetters.**directions.one]
 \enabletrackers[typesetters.**directions.two]

 \setupdirections[bidi=global,**method=default] \arabicfont این (یک
 آزمایش 1363) است. \par
 \setupdirections[bidi=global,**method=one] \arabicfont این (یک
 آزمایش 1363) است. \par
 \setupdirections[bidi=global,**method=two] \arabicfont این (یک
 آزمایش 1363) است. \par

 \stoptext


  One related question: is it possible to change font automatically when
 luatex sees a LTR word?


 no, but you can define start\stop commands that deal with such switches

 also, you can combine fonts (and there a yet not documented auto
 script/language switcher .. i have no time now to explain that one)

 btw, never use \textdir and \pardir directly (i might even define them
 as no-ops some day) but use the higher level alignment commands

 Hans

 --**--**-
   Hans Hagen | PRAGMA ADE
   Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
 tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
  | www.pragma-pod.nl
 --**--**-
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Description: Adobe PDF document
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Re: [NTG-context] wrong behaviour with ConTeXt unicode bidi

2013-09-11 Thread Vafa Khalighi
Also the itemize environment is broken too (perhaps same issue is here too):

\setupitemize[left=(, right=), margin=4em, stopper=]
\starttext
\setupalign[r2l]
\definefont[arabicfont][Arial*arabic at 20pt]
\setupdirections[bidi=global,method=default]
\arabicfont
\startitemize[a]
\item اولی
\item دومی
\stopitemize
\stoptext

and if I swap right and left parentheses, I get the following error:

error: .../context/tex/texmf-context/tex/context/base/typo-dha.lua:184:
attempt to index local 'current' (a nil value)



On Wed, Sep 11, 2013 at 7:47 PM, Vafa Khalighi persian-...@tug.org wrote:

 I tried the latest beta; it fixes the problem I mentioned but breaks
 something else:

 \starttext

 \setupalign[r2l]

 \definefont[arabicfont][Arial*arabic at 20pt]



 \setupdirections[bidi=global,method=default]
 \hbox dir TRT{\arabicfont  (1984)}


 \stoptext

 If you have \hbox dir TLT, you get expected result. I am not sure if this
 is the side effect of using \hbox dir TRT.



 On Wed, Sep 11, 2013 at 2:20 AM, Vafa Khalighi persian-...@tug.orgwrote:

 Sorry that is not fixed. If you type two of these, the second one will be
 broken.

 \starttext

 \setupalign[r2l]

 \definefont[arabicfont][Arial*arabic at 20pt]



 \setupdirections[bidi=global,method=default] \arabicfont

 این (آزمایش 1363) و
 یک (آزمایش 1984) خوب
  است  و باقی ماجرا.


 \stoptext


 Vafa Khalighi


 On Wed, Sep 11, 2013 at 1:45 AM, Vafa Khalighi persian-...@tug.orgwrote:

 Thanks. That is now fixed.


 On Wed, Sep 11, 2013 at 1:26 AM, Hans Hagen pra...@wxs.nl wrote:

 On 9/10/2013 2:57 PM, Vafa Khalighi wrote:

 Hi

 The following document shows the wrong behaviour (the second
 parentheses
 is mirrored incorrectly and it should be after the number not before
 the
 number).

 Assuming test is an RTL word when I write (test 1363) I expect to get
 exactly that but somehow I get (test (1363


 new beta ... also with fix for issue khaled mentioned

 \starttext

 \setupalign[r2l]

 \definefont[arabicfont][Arial***arabic at 20pt]

 \enabletrackers[typesetters.**directions.one]
 \enabletrackers[typesetters.**directions.two]

 \setupdirections[bidi=global,**method=default] \arabicfont این (یک
 آزمایش 1363) است. \par
 \setupdirections[bidi=global,**method=one] \arabicfont این (یک
 آزمایش 1363) است. \par
 \setupdirections[bidi=global,**method=two] \arabicfont این (یک
 آزمایش 1363) است. \par

 \stoptext


  One related question: is it possible to change font automatically when
 luatex sees a LTR word?


 no, but you can define start\stop commands that deal with such switches

 also, you can combine fonts (and there a yet not documented auto
 script/language switcher .. i have no time now to explain that one)

 btw, never use \textdir and \pardir directly (i might even define them
 as no-ops some day) but use the higher level alignment commands

 Hans

 --**--**-
   Hans Hagen | PRAGMA ADE
   Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
 tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
  | www.pragma-pod.nl
 --**--**-
 __**__**
 ___
 If your question is of interest to others as well, please add an entry
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 archive  : 
 http://foundry.supelec.fr/**projects/contextrev/http://foundry.supelec.fr/projects/contextrev/
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Description: Adobe PDF document
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Re: [NTG-context] wrong behaviour with ConTeXt unicode bidi

2013-09-11 Thread Hans Hagen

On 9/11/2013 1:34 PM, Vafa Khalighi wrote:

Also the itemize environment is broken too (perhaps same issue is here too):

\setupitemize[left=(, right=), margin=4em, stopper=]
\starttext
\setupalign[r2l]
\definefont[arabicfont][Arial*arabic at 20pt]
\setupdirections[bidi=global,method=default]
\arabicfont
\startitemize[a]
\item اولی
\item دومی
\stopitemize
\stoptext

and if I swap right and left parentheses, I get the following error:


thanks for testing

the problem is that sometimes it's hard to deduce the state so i've added

\righttolefthbox \rtlhbox
\lefttorighthbox \ltrhbox
\righttoleftvbox \rtlvbox
\lefttorightvbox \ltrvbox
\righttoleftvtop \rtlvtop
\lefttorightvtop \ltrvtop

\autodirhbox
\autodirvbox
\autodirvtop

some cases are (using the default parser, which is a one-pass forward 
scanner) tricky to determine


  \hbox{\righttoleft(0001)}\par
   \dontleavehmode\hbox{\righttoleft(0002)}\par
   {\righttoleft(0003)\par}
   {\righttoleft(0004)}\par
\dontleavehmode{\righttoleft(0005)\par}
\dontleavehmode{\righttoleft(0006)}\par
   \rtlhbox{(0007)}\par
   \ltrhbox{(0008)}\par
\dontleavehmode\rtlhbox{(0009)}\par
\dontleavehmode\ltrhbox{(0010)}\par

  \hbox{(0011)}\par
   \dontleavehmode\hbox{(0012)}\par

the other parsers do several passes and are slower can can handle some 
cases better


anyway, it would be nice to see where the three methods fail:

\setuplayout[middle]

\starttext

\setupalign[r2l]

\definefont[arabicfont][Arial*arabic at 20pt]

\enabletrackers[typesetters.directions.default]
\enabletrackers[typesetters.directions.one]
\enabletrackers[typesetters.directions.two]

\setupdirections[bidi=global,method=default]
% \setupdirections[bidi=global,method=one]
% \setupdirections[bidi=global,method=two]

\arabicfont \setupinterlinespace

  \hbox{\righttoleft(0001)}\par
   \dontleavehmode\hbox{\righttoleft(0002)}\par
   {\righttoleft(0003)\par}
   {\righttoleft(0004)}\par
\dontleavehmode{\righttoleft(0005)\par}
\dontleavehmode{\righttoleft(0006)}\par
   \rtlhbox{(0007)}\par
   \ltrhbox{(0008)}\par
\dontleavehmode\rtlhbox{(0009)}\par
\dontleavehmode\ltrhbox{(0010)}\par

  \hbox{(0011)}\par
   \dontleavehmode\hbox{(0012)}\par

\setupitemize[left=(,right=),distance=1em]

\startitemize[a]
\item اولی
\item دومی
\stopitemize

(1984)

این (آزمایش 1363] و یک (آزمایش 1984] خوب است  و باقی ماجرا. \blank

این (آزمایش (oeps 1363)) و یک (آزمایش 1984) خوب است  و باقی ماجرا. \blank

این (آزمایش (oeps 1363)) و یک \blank

این (آزمایش [oeps 1363]) و یک \blank
این (آزمایش [oeps 1363)] و یک \blank

\stoptext


Hans


-
  Hans Hagen | PRAGMA ADE
  Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
 | www.pragma-pod.nl
-
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Re: [NTG-context] wrong behaviour with ConTeXt unicode bidi

2013-09-11 Thread Khaled Hosny
On Wed, Sep 11, 2013 at 02:37:35PM +0200, Hans Hagen wrote:
 anyway, it would be nice to see where the three methods fail:

Of the three, method one seems to give correct results on all the given
tests (I’m yet to test with my own documents).

I’m skeptical that bidi can be implemented in a one pass algorithm,
there have been a one pass algorithm called “Pretty Good Bidi
Algorithm”, but it has its limitation (I never tested it myself).

http://web.archive.org/web/20090225171532/http://crl.nmsu.edu/~mleisher/ucdata.html

Regards,
Khaled
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Re: [NTG-context] wrong behaviour with ConTeXt unicode bidi

2013-09-11 Thread Hans Hagen

On 9/11/2013 5:24 PM, Khaled Hosny wrote:

On Wed, Sep 11, 2013 at 02:37:35PM +0200, Hans Hagen wrote:

anyway, it would be nice to see where the three methods fail:


Of the three, method one seems to give correct results on all the given
tests (I’m yet to test with my own documents).

I’m skeptical that bidi can be implemented in a one pass algorithm,
there have been a one pass algorithm called “Pretty Good Bidi
Algorithm”, but it has its limitation (I never tested it myself).


Sure, although it can be close to okay with some backward and forward 
scanning but I'm nbot really in the mood for that now. Anyhow, for the 
occasional mix of arabic and latin this method works ok. For more 
extreme cases method 'one' will do and method 'two' ... well it depends 
on developments in unicode as this method will be the more configurable 
one. (And I can probably make a faster implementation of method two when 
performance matters.)


Hans


-
  Hans Hagen | PRAGMA ADE
  Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
 | www.pragma-pod.nl
-
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[NTG-context] wrong behaviour with ConTeXt unicode bidi

2013-09-10 Thread Vafa Khalighi
Hi

The following document shows the wrong behaviour (the second parentheses is
mirrored incorrectly and it should be after the number not before the
number).

Assuming test is an RTL word when I write (test 1363) I expect to get
exactly that but somehow I get (test (1363

One related question: is it possible to change font automatically when
luatex sees a LTR word?

Thanks

Vafa Khalighi


test.tex
Description: TeX document


test.pdf
Description: Adobe PDF document
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Re: [NTG-context] wrong behaviour with ConTeXt unicode bidi

2013-09-10 Thread Hans Hagen

On 9/10/2013 2:57 PM, Vafa Khalighi wrote:

Hi

The following document shows the wrong behaviour (the second parentheses
is mirrored incorrectly and it should be after the number not before the
number).

Assuming test is an RTL word when I write (test 1363) I expect to get
exactly that but somehow I get (test (1363


new beta ... also with fix for issue khaled mentioned

\starttext

\setupalign[r2l]

\definefont[arabicfont][Arial*arabic at 20pt]

\enabletrackers[typesetters.directions.one]
\enabletrackers[typesetters.directions.two]

\setupdirections[bidi=global,method=default] \arabicfont این (یک آزمایش 
1363) است. \par
\setupdirections[bidi=global,method=one] \arabicfont این (یک آزمایش 
1363) است. \par
\setupdirections[bidi=global,method=two] \arabicfont این (یک آزمایش 
1363) است. \par


\stoptext


One related question: is it possible to change font automatically when
luatex sees a LTR word?


no, but you can define start\stop commands that deal with such switches

also, you can combine fonts (and there a yet not documented auto 
script/language switcher .. i have no time now to explain that one)


btw, never use \textdir and \pardir directly (i might even define them 
as no-ops some day) but use the higher level alignment commands


Hans

-
  Hans Hagen | PRAGMA ADE
  Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
 | www.pragma-pod.nl
-
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Re: [NTG-context] wrong behaviour with ConTeXt unicode bidi

2013-09-10 Thread Vafa Khalighi
Sorry that is not fixed. If you type two of these, the second one will be
broken.

\starttext

\setupalign[r2l]

\definefont[arabicfont][Arial*arabic at 20pt]



\setupdirections[bidi=global,method=default] \arabicfont

این (آزمایش 1363) و
یک (آزمایش 1984) خوب
 است  و باقی ماجرا.


\stoptext


Vafa Khalighi


On Wed, Sep 11, 2013 at 1:45 AM, Vafa Khalighi persian-...@tug.org wrote:

 Thanks. That is now fixed.


 On Wed, Sep 11, 2013 at 1:26 AM, Hans Hagen pra...@wxs.nl wrote:

 On 9/10/2013 2:57 PM, Vafa Khalighi wrote:

 Hi

 The following document shows the wrong behaviour (the second parentheses
 is mirrored incorrectly and it should be after the number not before the
 number).

 Assuming test is an RTL word when I write (test 1363) I expect to get
 exactly that but somehow I get (test (1363


 new beta ... also with fix for issue khaled mentioned

 \starttext

 \setupalign[r2l]

 \definefont[arabicfont][Arial***arabic at 20pt]

 \enabletrackers[typesetters.**directions.one]
 \enabletrackers[typesetters.**directions.two]

 \setupdirections[bidi=global,**method=default] \arabicfont این (یک
 آزمایش 1363) است. \par
 \setupdirections[bidi=global,**method=one] \arabicfont این (یک
 آزمایش 1363) است. \par
 \setupdirections[bidi=global,**method=two] \arabicfont این (یک
 آزمایش 1363) است. \par

 \stoptext


  One related question: is it possible to change font automatically when
 luatex sees a LTR word?


 no, but you can define start\stop commands that deal with such switches

 also, you can combine fonts (and there a yet not documented auto
 script/language switcher .. i have no time now to explain that one)

 btw, never use \textdir and \pardir directly (i might even define them as
 no-ops some day) but use the higher level alignment commands

 Hans

 --**--**-
   Hans Hagen | PRAGMA ADE
   Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
 tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
  | www.pragma-pod.nl
 --**--**-
 __**__**
 ___
 If your question is of interest to others as well, please add an entry to
 the Wiki!

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 http://foundry.supelec.fr/**projects/contextrev/http://foundry.supelec.fr/projects/contextrev/
 wiki : http://contextgarden.net
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Re: [NTG-context] wrong behaviour with ConTeXt unicode bidi

2013-09-10 Thread Vafa Khalighi
Thanks. That is now fixed.


On Wed, Sep 11, 2013 at 1:26 AM, Hans Hagen pra...@wxs.nl wrote:

 On 9/10/2013 2:57 PM, Vafa Khalighi wrote:

 Hi

 The following document shows the wrong behaviour (the second parentheses
 is mirrored incorrectly and it should be after the number not before the
 number).

 Assuming test is an RTL word when I write (test 1363) I expect to get
 exactly that but somehow I get (test (1363


 new beta ... also with fix for issue khaled mentioned

 \starttext

 \setupalign[r2l]

 \definefont[arabicfont][Arial***arabic at 20pt]

 \enabletrackers[typesetters.**directions.one]
 \enabletrackers[typesetters.**directions.two]

 \setupdirections[bidi=global,**method=default] \arabicfont این (یک آزمایش
 1363) است. \par
 \setupdirections[bidi=global,**method=one] \arabicfont این (یک آزمایش
 1363) است. \par
 \setupdirections[bidi=global,**method=two] \arabicfont این (یک آزمایش
 1363) است. \par

 \stoptext


  One related question: is it possible to change font automatically when
 luatex sees a LTR word?


 no, but you can define start\stop commands that deal with such switches

 also, you can combine fonts (and there a yet not documented auto
 script/language switcher .. i have no time now to explain that one)

 btw, never use \textdir and \pardir directly (i might even define them as
 no-ops some day) but use the higher level alignment commands

 Hans

 --**--**-
   Hans Hagen | PRAGMA ADE
   Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
 tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
  | www.pragma-pod.nl
 --**--**-
 __**__**
 ___
 If your question is of interest to others as well, please add an entry to
 the Wiki!

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