* \setextrafontkerns can cause an infinite loop
@ 2022-06-30 9:16 Max Chernoff via ntg-context
2022-06-30 18:33 ` Hans Hagen via ntg-context
0 siblings, 1 reply; 2+ messages in thread
From: Max Chernoff via ntg-context @ 2022-06-30 9:16 UTC (permalink / raw)
To: mailing list for ConTeXt users; +Cc: Max Chernoff
Sometimes using \setextrafontkerns can cause an infinite loop.
Example 1:
\setextrafontkerns[max]
\starttext
l\it l
\stoptext
Example 2:
\setupbodyfont[libertinus]
\setextrafontkerns[max]
\starttext
x\ss x
\stoptext
Both of these examples cause ConTeXt to get stuck until it runs out of
memory. This happens in both MkIV and MkXL.
This patch seems to fix the issue (although it may break other things...):
--- texmf-context/tex/context/base/mkiv/typo-fkr.old 2022-06-30 03:05:17.702804200 -0600
+++ texmf-context/tex/context/base/mkiv/typo-fkr.lua 2022-06-30 03:05:22.286858200 -0600
@@ -57,6 +57,7 @@
end
if kern ~= 0 then
head, current = insertbefore(head,current,new_kern(kern))
+ current = getnext(current)
end
lastdata = data
else
@@ -69,6 +70,7 @@
local kern = getkernpair(lastdata,lastchar,char)
if kern ~= 0 then
head, current = insertbefore(head,current,new_kern(kern))
+ current = getnext(current)
end
end
lastchar = char
-- Max
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^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: \setextrafontkerns can cause an infinite loop
2022-06-30 9:16 \setextrafontkerns can cause an infinite loop Max Chernoff via ntg-context
@ 2022-06-30 18:33 ` Hans Hagen via ntg-context
0 siblings, 0 replies; 2+ messages in thread
From: Hans Hagen via ntg-context @ 2022-06-30 18:33 UTC (permalink / raw)
To: Max Chernoff via ntg-context; +Cc: Hans Hagen
On 6/30/2022 11:16 AM, Max Chernoff via ntg-context wrote:
> Sometimes using \setextrafontkerns can cause an infinite loop.
>
> Example 1:
>
> \setextrafontkerns[max]
>
> \starttext
> l\it l
> \stoptext
>
> Example 2:
>
> \setupbodyfont[libertinus]
>
> \setextrafontkerns[max]
>
> \starttext
> x\ss x
> \stoptext
>
> Both of these examples cause ConTeXt to get stuck until it runs out of
> memory. This happens in both MkIV and MkXL.
>
> This patch seems to fix the issue (although it may break other things...):
>
> --- texmf-context/tex/context/base/mkiv/typo-fkr.old 2022-06-30
> 03:05:17.702804200 -0600
> +++ texmf-context/tex/context/base/mkiv/typo-fkr.lua 2022-06-30
> 03:05:22.286858200 -0600
> @@ -57,6 +57,7 @@
> end
> if kern ~= 0 then
> head, current =
> insertbefore(head,current,new_kern(kern))
> + current = getnext(current)
> end
> lastdata = data
> else
> @@ -69,6 +70,7 @@
> local kern = getkernpair(lastdata,lastchar,char)
> if kern ~= 0 then
> head, current =
> insertbefore(head,current,new_kern(kern))
> + current = getnext(current)
> end
> end
> lastchar = char
just
head =
insertbefore(head,current,new_kern(kern))
will do
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-----------------------------------------------------------------
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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
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archive : https://bitbucket.org/phg/context-mirror/commits/
wiki : http://contextgarden.net
___________________________________________________________________________________
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