Re: Rendering of ZWNJ and ZWJ

[Hans Hagen <pragma@wxs.nl>]

Khaled Hosny wrote:
> On Mon, Jun 09, 2008 at 06:32:13PM -0600, Idris Samawi Hamid wrote:
>> Hi Hans,
>>
>> On Mon, 09 Jun 2008 09:45:10 -0600, Hans Hagen <pragma@wxs.nl> wrote:
>>
>>> Khaled Hosny wrote:
>>>> Using Luatex engine, ZWNJ and ZWJ chars are rendered incorrectly. If the
>>>> font has a glyph for it, it does the expected behaviour (force
>>>> non-joining or joining respectively) but the glyph get rendered while it
>>>> shouldn't. But if the font has no glyphs for it, it has no effect at
>>>> all. See the attached example.
>>> i uploaded a beta
>>>
>>> after analyzing i now remove the joiners
>> Not sure if this is the best approach:
>>
>> Despite what MS Typography says, I think it's important to maintain the  
>> joiner info after analysis. If I select text from a pdf, the joiner info  
>> should be there. This is important for, eg, switching from Arabic-language  
>> to Farsi-language typography. So If I select some pdf text formatted  
>> according to Farsi rules, I should be able to save that text with the  
>> rules included.
>>
>> Can this be made an option, so fonts that contain zwj zwnj are not  
>> affected?
> 
> Well, I've very little ConTeXt knowledge to actually understand this. My
> main point was that non-printable formatting characters like ZWNJ, ZWJ
> should be font independent i.e. when I insert a ZWNJ it inhibits the
> joining of Arabic letters without being printed, the font having or not
> having a glyph for it shouldn't affect this. In the other hand, it
> should be their so that when I copy the text I get it (since it is part
> of the input and has semantical value).
> 
> Is this what we have here?

i made them font independent in the sense that they need not be present 
in the font; however, the rendering is optional


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