Re: [NTG-context] Rendering of ZWNJ and ZWJ

Khaled Hosny wrote:

On Mon, Jun 09, 2008 at 06:32:13PM -0600, Idris Samawi Hamid wrote:

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Hi Hans,

On Mon, 09 Jun 2008 09:45:10 -0600, Hans Hagen wrote:

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Khaled Hosny wrote:

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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 ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com | www.pragma-pod.nl -----------------------------------------------------------------