Wolfgang,

thanks for looking into it!

does this mean there is some bug in CONTEXT/LuaTeX font loading or
something wrong with the font?  i looked at the history on bitbucket mirror
and the problem seems to have started when we moved from 2016-08-11 14:00:00
 to 2016-08-15 22:45:00.

the offending lines in tex/context/base/mkiv/font-ots.lua (line 3762) has

kerns={
 [1705]={
  [2]={ 0, 0, -290, 0 },
 },
 [1707]={
  [2]={ 0, 0, -290, 0 },
 },
 [1711]={
  [2]={ 0, 0, -290, 0 },
 },
 [64400]={
  [2]={ 0, 0, -290, 0 },
 },
 [64404]={
  [2]={ 0, 0, -290, 0 },
 },
 [64469]={
  [2]={ 0, 0, -290, 0 },
 },
 [65243]={
  [2]={ 0, 0, -290, 0 },
 },
 [983071]={
  [2]={ 0, 0, -290, 0 },
 },
}

and with k, v = 1705, { 0, 0, -290, 0 }, we want to dereference v[1][3],
which leads to an error.  prior to this change, the code was looking up
v[3] (which would result in nil but no further dereferencing to cause an
error).  i checked that this part of the table was the same with the
previous version (from 08-08).

—MHB

On Mon, Aug 22, 2016 at 11:45 AM, Wolfgang Schuster <
schuster.wolfgang@gmail.com> wrote:

> Mohammad Hossein Bateni <bateni@gmail.com>
> 22. August 2016 um 17:01
> Hello,
>
> After the upgrade to latest beta (from 08.08 21:28), I cannot load many of
> my Persian fonts (one uploaded here <http://mhbateni.com/context/bug-03/>
> for testing).  It works on "current" without any issues but not on "beta".
> Find an MWE as well as the error message below.  (I did test on a fresh
> standalone version as well.)
>
>
> \starttext
> \definedfont[HMXNiloofar*arabic]
> Salam
> \stoptext
>
>
> When I change the value from the "hasspacekerns" variable (after deleting
> hm-xniloofar.tmc) in hm-xniloofar.tma from true to false the font is loaded
> without errors.
>
>
> hm-xniloofar.tma (line 7147 ff):
>
>  ["properties"]={
>   ["hascolor"]=false,
>   ["hasitalics"]=false,
>   ["hasspacekerns"]=true,
>  },
>
>
> Wolfgang
>
> ____________________________________________________________
> _______________________
> 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
> ____________________________________________________________
> _______________________
>