Re: [NTG-context] First letter lost possible cause: \grabbfferdata
On 2014-06-25 16:07, Hans Hagen wrote:
On 6/25/2014 10:03 PM, Rik Kabel wrote:
On 2014-06-25 15:51, Rik Kabel wrote:
Recently there have been reports of the first letter of a line of text
being lost in the database and letter modules.
I tracked down what appears to be the same problem and developed a
work-around.
The problem appears to be with the \grabbufferdata command. Something
has changed in the way it works, and it now swallows the first token
of the buffer that it grabs. It may also show up with other commands,
but this is the only one I have found in my projects.
And as soon as I post, I see that Hans has found the problem in the
buffering code.
but you're going to test it -)
Indeed I have, but my tests mean little beyond what I can eyeball to see
if it still looks okay. I might say that the issue is resolved for my
small environment but I do not know what side-effects may result from
the change. I have no library of edge cases, no integrated build
environment, and only a single platform.
That said, however, the issue disappears for my projects when I remake
ConTeXt (and ConTeXtjit) with your patch.
And clearly, the \ignorespaces that I used in my workaround was just a
convenient no-op. I could have used {} or \relax to the same effect.
--
Rik Kabel
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Re: [NTG-context] First letter lost possible cause: \grabbfferdata
On 6/25/2014 10:03 PM, Rik Kabel wrote: On 2014-06-25 15:51, Rik Kabel wrote: Recently there have been reports of the first letter of a line of text being lost in the database and letter modules. I tracked down what appears to be the same problem and developed a work-around. The problem appears to be with the \grabbufferdata command. Something has changed in the way it works, and it now swallows the first token of the buffer that it grabs. It may also show up with other commands, but this is the only one I have found in my projects. And as soon as I post, I see that Hans has found the problem in the buffering code. but you're going to test it -) - Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com | www.pragma-pod.nl - ___ 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 ___
Re: [NTG-context] First letter lost possible cause: \grabbfferdata
On 2014-06-25 15:51, Rik Kabel wrote: Recently there have been reports of the first letter of a line of text being lost in the database and letter modules. I tracked down what appears to be the same problem and developed a work-around. The problem appears to be with the \grabbufferdata command. Something has changed in the way it works, and it now swallows the first token of the buffer that it grabs. It may also show up with other commands, but this is the only one I have found in my projects. And as soon as I post, I see that Hans has found the problem in the buffering code. -- Rik Kabel ___ 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 ___
[NTG-context] First letter lost possible cause: \grabbfferdata
Recently there have been reports of the first letter of a line of text
being lost in the database and letter modules.
I tracked down what appears to be the same problem and developed a
work-around.
The problem appears to be with the \grabbufferdata command. Something
has changed in the way it works, and it now swallows the first token of
the buffer that it grabs. It may also show up with other commands, but
this is the only one I have found in my projects.
If you have code with this command, a workaround is to insert
\ignorespaces after it. I have no idea why this helps. If you do not
have the code (if it is in somebody else's module), then using a blank
line or dummy argument or \relax after the command that calls the code
with \grabbufferdata may help.
The following code shows the issues and these workarounds.
% macros=mkvi
\starttexdefinition unexpanded startNoIgnore
\begingroup
\dostartNoIgnore
\stoptexdefinition
\starttexdefinition dostartNoIgnore
\grabbufferdata[Test][startNoIgnore][stopTest]
\stoptexdefinition
\starttexdefinition unexpanded startWithIgnore
\begingroup
\dostartWithIgnore
\stoptexdefinition
\starttexdefinition dostartWithIgnore
\grabbufferdata[Test][startWithIgnore][stopTest]
\ignorespaces
\stoptexdefinition
\starttexdefinition stopTest
\getbufferdata[Test]
\endgroup
\stoptexdefinition
\define\TestText
{\qquad If you can read this the first token was not swallowed.}
\starttext
\subject{Test without \tex{ignorespaces}}
First, the problem:
\startNoIgnore\TestText\stopTest
And the same with \type{{}}
\startWithIgnore{}\TestText\stopTest
Workaround with \tex{relax}
\startNoIgnore\relax\TestText\stopTest
Workaround with blank line
\startNoIgnore
\TestText\stopTest
\subject{Test with \tex{ignorespaces}}
This now works:
\startWithIgnore\TestText\stopTest
And the same with \type{{}}
\startWithIgnore{}\TestText\stopTest
And the same with \tex{relax}
\startWithIgnore\relax\TestText\stopTest
And the same with a blank line after the opening
\startWithIgnore
\TestText\stopTest
\stoptext
--
Rik Kabel
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