Unexpected emergency stop

Unexpected emergency stop

[Tim Steenvoorden]

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Dear all,

After some time I’m back to ConTeXt and I dug up some old macros. I used to
define a \see macro to automatically insert labels like “chapter”, "figure"
etc. in front of a reference based on the structure of the label. Below
you'll find its definition.

It worked in MKIV about two years ago, nevertheless, now ConTeXt hangs when
placing punctuation after the command. I.e. TeX hangs with an emergency
stop (“*" on the terminal) after all files have been processed (after
cont-yes.mkiv is closed).

What am I doing wrong that such a thing happens?

I’m on macOS 10.13.3 with minimals beta 2018.02.09 00:04.

Cheers,
Tim


––––––

\starttext

\definemacro\see[#1:#2]
  {\dosee{#1}{#2}}

\starttexdefinition dosee #1#2
  \doifdefinedelse{in#1}
    {\getvalue{in#1}[#1:#2]}
    {\writestatus{references}{reference format in#1 not defined}
     \in[#1:#2]}
\stoptexdefinition % #3 is optional and gobbled by \in

\definereferenceformat[inchp]
  [text=\word{\labeltext{chapter}}]

\setuplabeltext[en]
  [chapter=Chapter~]

\chapter[chp:first]{First}

Works:
\see[chp:first]

Hangs:
\see[chp:first],

\stoptext

––––––
-- 
----
T.J. Steenvoorden, MSc

PhD Candidate | Radboud University Nijmegen
Faculty of Science | Department of Software Science
Mercator 1 Building | Room 01.08
Toernooiveld 212 | 6525 EC | Nijmegen | The Netherlands
+31 24 365 22 91 | t.steenvoorden@cs.ru.nl

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___________________________________________________________________________________

Re: Unexpected emergency stop

[Otared Kavian]

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Hi Tim,

Welcome back to ConTeXt!
When one defines a command, in particular when using the brackets […], it is wise to put a percent sign at the end of the line if one changes the line on which the macro is defined.
In your case, saying

\definemacro\see[#1:#2]%
	{\dosee{#1}{#2}}

suppresses the problem you are reporting (at least here on my machine running MacOS 10.13.3 and the latest beta as yours).

Best regards: OK 

> On 9 Feb 2018, at 19:03, Tim Steenvoorden <tim.steenvoorden@gmail.com> wrote:
> 
> Dear all,
> 
> After some time I’m back to ConTeXt and I dug up some old macros. I used to define a \see macro to automatically insert labels like “chapter”, "figure" etc. in front of a reference based on the structure of the label. Below you'll find its definition.
> 
> It worked in MKIV about two years ago, nevertheless, now ConTeXt hangs when placing punctuation after the command. I.e. TeX hangs with an emergency stop (“*" on the terminal) after all files have been processed (after cont-yes.mkiv is closed).
> 
> What am I doing wrong that such a thing happens?
> 
> I’m on macOS 10.13.3 with minimals beta 2018.02.09 00:04.
> 
> Cheers,
> Tim
> 
> 
> –––––– 
> 
> \starttext
> 
> \definemacro\see[#1:#2]
>   {\dosee{#1}{#2}}
> 
> \starttexdefinition dosee #1#2
>   \doifdefinedelse{in#1}
>     {\getvalue{in#1}[#1:#2]}
>     {\writestatus{references}{reference format in#1 not defined}
>      \in[#1:#2]}
> \stoptexdefinition % #3 is optional and gobbled by \in
> 
> \definereferenceformat[inchp]
>   [text=\word{\labeltext{chapter}}]
> 
> \setuplabeltext[en]
>   [chapter=Chapter~]
> 
> \chapter[chp:first]{First}
> 
> Works:
> \see[chp:first]
> 
> Hangs:
> \see[chp:first],
> 
> \stoptext
> 
> –––––– 
> -- 
> ----
> T.J. Steenvoorden, MSc
> 
> PhD Candidate | Radboud University Nijmegen
> Faculty of Science | Department of Software Science
> Mercator 1 Building | Room 01.08
> Toernooiveld 212 | 6525 EC | Nijmegen | The Netherlands
> +31 24 365 22 91 | t.steenvoorden@cs.ru.nl <mailto:t.steenvoorden@cs.ru.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://context.aanhet.net
> archive  : https://bitbucket.org/phg/context-mirror/commits/
> wiki     : http://contextgarden.net
> ___________________________________________________________________________________


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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://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: Unexpected emergency stop

[Tim Steenvoorden]

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Thanks Otared! Works like a charm!

Out of curiosity, could you explain the mechanics behind this? I know it is
a commonly used trick in TeX macro definitions, but I don’t know how it
changes TeX’s understanding of the tokes it parses.

Cheers,
Tim

Op vr 9 feb. 2018 om 20:50 schreef Otared Kavian <otared@gmail.com>:

> Hi Tim,
>
> Welcome back to ConTeXt!
> When one defines a command, in particular when using the brackets […], it
> is wise to put a percent sign at the end of the line if one changes the
> line on which the macro is defined.
> In your case, saying
>
> \definemacro\see[#1:#2]%
> {\dosee{#1}{#2}}
>
> suppresses the problem you are reporting (at least here on my machine
> running MacOS 10.13.3 and the latest beta as yours).
>
> Best regards: OK
>
> On 9 Feb 2018, at 19:03, Tim Steenvoorden <tim.steenvoorden@gmail.com>
> wrote:
>
> Dear all,
>
> After some time I’m back to ConTeXt and I dug up some old macros. I used
> to define a \see macro to automatically insert labels like “chapter”,
> "figure" etc. in front of a reference based on the structure of the label.
> Below you'll find its definition.
>
> It worked in MKIV about two years ago, nevertheless, now ConTeXt hangs
> when placing punctuation after the command. I.e. TeX hangs with an
> emergency stop (“*" on the terminal) after all files have been processed
> (after cont-yes.mkiv is closed).
>
> What am I doing wrong that such a thing happens?
>
> I’m on macOS 10.13.3 with minimals beta 2018.02.09 00:04.
>
> Cheers,
> Tim
>
>
> ––––––
>
> \starttext
>
> \definemacro\see[#1:#2]
>   {\dosee{#1}{#2}}
>
> \starttexdefinition dosee #1#2
>   \doifdefinedelse{in#1}
>     {\getvalue{in#1}[#1:#2]}
>     {\writestatus{references}{reference format in#1 not defined}
>      \in[#1:#2]}
> \stoptexdefinition % #3 is optional and gobbled by \in
>
> \definereferenceformat[inchp]
>   [text=\word{\labeltext{chapter}}]
>
> \setuplabeltext[en]
>   [chapter=Chapter~]
>
> \chapter[chp:first]{First}
>
> Works:
> \see[chp:first]
>
> Hangs:
> \see[chp:first],
>
> \stoptext
>
> ––––––
> --
> ----
> T.J. Steenvoorden, MSc
>
> PhD Candidate | Radboud University Nijmegen
> Faculty of Science | Department of Software Science
> Mercator 1 Building | Room 01.08
> Toernooiveld 212 | 6525 EC | Nijmegen | The Netherlands
> +31 24 365 22 91 | t.steenvoorden@cs.ru.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://context.aanhet.net
> archive  : https://bitbucket.org/phg/context-mirror/commits/
> wiki     : http://contextgarden.net
>
> ___________________________________________________________________________________
>
>
>
> ___________________________________________________________________________________
> 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://context.aanhet.net
> archive  : https://bitbucket.org/phg/context-mirror/commits/
> wiki     : http://contextgarden.net
>
> ___________________________________________________________________________________

-- 
----
T.J. Steenvoorden, MSc

PhD Candidate | Radboud University Nijmegen
Faculty of Science | Department of Software Science
Mercator 1 Building | Room 01.08
Toernooiveld 212 | 6525 EC | Nijmegen | The Netherlands
+31 24 365 22 91 | t.steenvoorden@cs.ru.nl

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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://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: Unexpected emergency stop

[Wolfgang Schuster]

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> Tim Steenvoorden <mailto:tim.steenvoorden@gmail.com>
> 10. Februar 2018 um 12:44
> Thanks Otared! Works like a charm!
>
> Out of curiosity, could you explain the mechanics behind this? I know 
> it is a commonly used trick in TeX macro definitions, but I don’t know 
> how it changes TeX’s understanding of the tokes it parses.

When you create a new commands like this

     \def\mycommand[#1]{...}

the brackets are delimiters for the argument of the command, i.e. when 
TeX sees
\mycommand it looks for [ and grabs everything intill ] as as argument. 
When you
out now a space (or start a new line) after ] in your definition of the 
command, e.g.

     \def\mycommand[#1] {...}

TeX looks now for “] ” (right bracket followed by a space) as delimiter for
the argument of your command.

Wolfgang

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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://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: Unexpected emergency stop

[Tim Steenvoorden]

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Thanks Wolfgang, that’s a clear and easy explanation!

Cheers,
Tim
Op za 10 feb. 2018 om 13:46 schreef Wolfgang Schuster <
schuster.wolfgang@gmail.com>

>
> Tim Steenvoorden <tim.steenvoorden@gmail.com>
> 10. Februar 2018 um 12:44
>
> Thanks Otared! Works like a charm!
>
> Out of curiosity, could you explain the mechanics behind this? I know it
> is a commonly used trick in TeX macro definitions, but I don’t know how it
> changes TeX’s understanding of the tokes it parses.
>
>
> When you create a new commands like this
>
>     \def\mycommand[#1]{...}
>
> the brackets are delimiters for the argument of the command, i.e. when TeX
> sees
> \mycommand it looks for [ and grabs everything intill ] as as argument.
> When you
> out now a space (or start a new line) after ] in your definition of the
> command, e.g.
>
>     \def\mycommand[#1] {...}
>
> TeX looks now for “] ” (right bracket followed by a space) as delimiter for
> the argument of your command.
>
>
> 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://context.aanhet.net
> archive  : https://bitbucket.org/phg/context-mirror/commits/
> wiki     : http://contextgarden.net
>
> ___________________________________________________________________________________

-- 
----
T.J. Steenvoorden, MSc

PhD Candidate | Radboud University Nijmegen
Faculty of Science | Department of Software Science
Mercator 1 Building | Room 01.08
Toernooiveld 212 | 6525 EC | Nijmegen | The Netherlands
+31 24 365 22 91 | t.steenvoorden@cs.ru.nl

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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://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________