From: Hans van der Meer via ntg-context <ntg-context@ntg.nl>
To: NTG ConTeXt <ntg-context@ntg.nl>
Cc: Hans van der Meer <havdmeer@ziggo.nl>
Subject: Re: [NTG-context] letfrozen?
Date: Tue, 13 Jun 2023 12:43:25 +0200 [thread overview]
Message-ID: <BAAA7059-FA4E-4752-9B7C-0A0B4C4BDF36@ziggo.nl> (raw)
In-Reply-To: <2ea4e304-c79c-eaa4-6abf-f1f6897c446f@freedom.nl>
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Of course. But without that \enabledirective I can redefine the frozen macro at will, as a simple test did show.
The crux, however, is that one wants to protect the frozen code always, irrespective of that directive setting.
dr. Hans van der Meer
> On 12 Jun 2023, at 19:47, Hans Hagen via ntg-context <ntg-context@ntg.nl> wrote:
>
> On 6/12/2023 12:32 PM, Hans van der Meer via ntg-context wrote:
>>> On 12 Jun 2023, at 11:12, Hans Hagen via ntg-context <ntg-context@ntg.nl> wrote:
>>>
>>> On 6/12/2023 10:57 AM, Hans van der Meer via ntg-context wrote:
>>>> The manual LMTX-primitives on page 21 tells me:
>>>> You can explicitly freeze an unfrozen macro.
>>>> ...
>>>> A redefinition will now give: You can't redefine a frozen macro.
>>>> But is this true? The following code seems to contradict this:
>>>> \def\HOME{myhome}
>>>> \writestatus{1}{\meaning\HOME}
>>>> \letfrozen\HOME
>>>> \writestatus{2}{\meaning\HOME}
>>>> \def\HOME{other home}
>>>> \writestatus{3}{\meaning\HOME}
>>>> 
>>>> Is this mechanism broken? It looks so useful to prevent accidental redefinition!
>>>
>>> here i run with
>>>
>>> \enabledirectives[overloadmode=error]
>>>
>>> (you can do that in cont-sys.mkxl)
>>>
>>> \enabledirectives[overloadmode=warning]
>>> Hans
>>>
>> Pity. Now I get on loading the tex file:
>> "csname overload > fatal error, protection level 4, control sequence 'nbsp', properties 'immutable', file 't-hvdm-text.tex', line 63
>> while I had hoped that frozen would give me something like:
>> illegal attempt to redefine \HOME
>> Byproduct (not unwanted) the above illegal redefinition to be solved :-)
>> May I ask why obviously the frozen-mechanism seems (yet?) unimplemented?
> It's okay and has been around for quite a while now.
>
> \enabledirectives[overloadmode=error]
>
> \starttext
>
> \frozen\def\HOME{!!!!}
>
> \def\HOME{!!!!!}
>
> \stoptext
>
>
> -----------------------------------------------------------------
> Hans Hagen | PRAGMA ADE
> Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
> tel: 038 477 53 69 | www.pragma-ade.nl | 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 / https://www.ntg.nl/mailman/listinfo/ntg-context
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> wiki : https://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 / https://www.ntg.nl/mailman/listinfo/ntg-context
webpage : https://www.pragma-ade.nl / http://context.aanhet.net
archive : https://bitbucket.org/phg/context-mirror/commits/
wiki : https://contextgarden.net
___________________________________________________________________________________
next prev parent reply other threads:[~2023-06-13 10:44 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-12 8:57 Hans van der Meer via ntg-context
2023-06-12 9:12 ` Hans Hagen via ntg-context
2023-06-12 10:32 ` Hans van der Meer via ntg-context
2023-06-12 17:47 ` Hans Hagen via ntg-context
2023-06-13 10:43 ` Hans van der Meer via ntg-context [this message]
2023-06-13 17:23 ` Hans Hagen via ntg-context
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