Re: "Trial typesetting" in ConTeXt / lua ?

[<josephcanedo@gmail.com>]

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Hi Hans


First of all, thanks a lot for replying.


I tried your suggestion and it does not seem to work at least for fancy features in EB Garamond (historical liguratures and other features).

I also tried to pass the hbox to tex.linebreak() and got assertion failure in luatex. 


Is there any code snippet available to show the full process in lua code (I mean up to shipping the result nodes to the page) ?


To give some background, I’d like to compute a parshape for some paragraphs for which I’d like some special shape. I thought that one idea was to build up the lua nodes from text (which has some occasional words with  smaller or different font style), compute the width of text to figure out a first guess for parshape and then iterate on linebreak with different parshape settings to refine the first guess.


Thanks a lot,


Best regards


Joseph





From: Hans Hagen
Sent: ‎Wednesday‎, ‎November‎ ‎18‎, ‎2015 ‎2‎:‎46‎ ‎AM
To: ntg-context@ntg.nl





On 11/17/2015 9:15 AM, josephcanedo@gmail.com wrote:
> Hello,
>
> I was wondering if someone could have some hints on this question,
> anyway, I found the function mknodes() from luaTeX wiki and
> nodes.handlers.characters(head) function in ConTeXt (as it seems that
> node.ligaturing(head) and node.kerning(head) do not seem to do anything).
>
> It seems to work fine (ligatures and font features) expect the kerning.
> Does someone know how to perform the kerning as well ?

I'm not sure if i understand your issue.

traditional ligaturing and kerning is applied when a node list has fonts 
using basemode

\starttext

\startluacode

     local hbox = nodes.typesetters.hpack("Hello World!")

     context("%p",hbox.width)

     nodes.flush_list(hbox)

\stopluacode

\stoptext


> Best regards
>
> Joseph Canedo
>
> *From:* josephcanedo@gmail.com <mailto:josephcanedo@gmail.com>
> *Sent:* ‎Saturday‎, ‎November‎ ‎14‎, ‎2015 ‎11‎:‎16‎ ‎AM
> *To:* ntg-context@ntg.nl <mailto:ntg-context@ntg.nl>
>
> Dear all,
>
> Is it possible in ConTeXt within lua code to do “trial typesetting” (not
> sure that’s best name for what I would like to achieve) ? By this I mean
> store some input (with text and macros) in some buffer and do what
> ConTeXt does normally (parsing, create nodes …) but instead of shipping
> the nodes to line breaking algorithm and to the page output, only
> retrieve the nodes and after discard them. This is to get an estimate of
> the total text width within a paragraph (to calculate some shape on the
> paragraph).

you can assemble a list of characters and then do an hpack on them

> I browsed the lua code from http://source.contextgarden.net/
> <http://source.contextgarden.net/tex/context/base/node-ref.lua?search=nodecodes> but
> I do not dare to use too low level lua functionality.
>
> Many thanks for any hint (even a pointer to lua function).
>
> Best regards
>
> Joseph Canedo
>
>
>
>
> ___________________________________________________________________________________
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___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
archive  : http://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________