* Malicious little bugger
@ 2006-07-02 4:36 David Arnold
2006-07-02 11:23 ` Hans Hagen
0 siblings, 1 reply; 12+ messages in thread
From: David Arnold @ 2006-07-02 4:36 UTC (permalink / raw)
All,
Came across this again.
\placeformula[-]
\startformula
[9,\infty)=\{x:\,x\ge 9\}
\stopformula
Got it to compile with:
\placeformula[-]
\startformula\relax
[9,\infty)=\{x:\,x\ge 9\}
\stopformula
Yuk!
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: Malicious little bugger
2006-07-02 4:36 Malicious little bugger David Arnold
@ 2006-07-02 11:23 ` Hans Hagen
2006-07-02 18:15 ` Peter Münster
0 siblings, 1 reply; 12+ messages in thread
From: Hans Hagen @ 2006-07-02 11:23 UTC (permalink / raw)
David Arnold wrote:
> All,
>
> Came across this again.
>
> \placeformula[-]
> \startformula
> [9,\infty)=\{x:\,x\ge 9\}
> \stopformula
>
> Got it to compile with:
>
> \placeformula[-]
> \startformula\relax
> [9,\infty)=\{x:\,x\ge 9\}
> \stopformula
>
>
indeed, that's the price to pay for optional arguments
Hans
-----------------------------------------------------------------
Hans Hagen | PRAGMA ADE
Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com
| www.pragma-pod.nl
-----------------------------------------------------------------
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: Malicious little bugger
2006-07-02 11:23 ` Hans Hagen
@ 2006-07-02 18:15 ` Peter Münster
2006-07-02 19:01 ` Taco Hoekwater
2006-07-02 19:53 ` Hans Hagen
0 siblings, 2 replies; 12+ messages in thread
From: Peter Münster @ 2006-07-02 18:15 UTC (permalink / raw)
On Sun, 2 Jul 2006, Hans Hagen wrote:
> David Arnold wrote:
> >
> > \startformula\relax
> > [9,\infty)=\{x:\,x\ge 9\}
> > \stopformula
> >
> indeed, that's the price to pay for optional arguments
Really? Isn't it rather the price for optional space before the "["?
Cheers, Peter
--
http://pmrb.free.fr/contact/
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: Malicious little bugger
2006-07-02 18:15 ` Peter Münster
@ 2006-07-02 19:01 ` Taco Hoekwater
2006-07-02 19:53 ` Hans Hagen
1 sibling, 0 replies; 12+ messages in thread
From: Taco Hoekwater @ 2006-07-02 19:01 UTC (permalink / raw)
Peter Münster wrote:
> On Sun, 2 Jul 2006, Hans Hagen wrote:
>
>
>>David Arnold wrote:
>>
>>>\startformula\relax
>>>[9,\infty)=\{x:\,x\ge 9\}
>>>\stopformula
>>>
>>
>>indeed, that's the price to pay for optional arguments
>
> Really? Isn't it rather the price for optional space before the "["?
Same thing, because there is no way to turn that optional space off.
Taco
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: Malicious little bugger
2006-07-02 18:15 ` Peter Münster
2006-07-02 19:01 ` Taco Hoekwater
@ 2006-07-02 19:53 ` Hans Hagen
2006-07-02 20:25 ` Peter Münster
2006-07-02 23:35 ` David Arnold
1 sibling, 2 replies; 12+ messages in thread
From: Hans Hagen @ 2006-07-02 19:53 UTC (permalink / raw)
� wrote:
> On Sun, 2 Jul 2006, Hans Hagen wrote:
>
>
>> David Arnold wrote:
>>
>>> \startformula\relax
>>> [9,\infty)=\{x:\,x\ge 9\}
>>> \stopformula
>>>
>>>
>> indeed, that's the price to pay for optional arguments
>>
>
> Really? Isn't it rather the price for optional space before the "["?
>
for tex:
\bla[
and
\bla [
are the same, i.e. the \cs ends at a non-letter and the space is gobbled
Hans
-----------------------------------------------------------------
Hans Hagen | PRAGMA ADE
Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com
| www.pragma-pod.nl
-----------------------------------------------------------------
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^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: Malicious little bugger
2006-07-02 19:53 ` Hans Hagen
@ 2006-07-02 20:25 ` Peter Münster
2006-07-02 23:35 ` David Arnold
1 sibling, 0 replies; 12+ messages in thread
From: Peter Münster @ 2006-07-02 20:25 UTC (permalink / raw)
On Sun, 2 Jul 2006, Hans Hagen wrote:
> for tex:
>
> \bla[
>
> and
>
> \bla [
>
> are the same, i.e. the \cs ends at a non-letter and the space is gobbled
Ah, I see...
Then, the #1 in
\def\MyZigzag#1[#2]{%
% the #1 makes sure we allow a space before the bracket
on page http://wiki.contextgarden.net/Commands_with_KeyVal_arguments seems
to be not really necessary.
Thanks, Peter
--
http://pmrb.free.fr/contact/
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: Malicious little bugger
2006-07-02 19:53 ` Hans Hagen
2006-07-02 20:25 ` Peter Münster
@ 2006-07-02 23:35 ` David Arnold
2006-07-03 2:29 ` Sanjoy Mahajan
1 sibling, 1 reply; 12+ messages in thread
From: David Arnold @ 2006-07-02 23:35 UTC (permalink / raw)
Can someone give me an example where this happens in either latex or
tex?
On Jul 2, 2006, at 12:53 PM, Hans Hagen wrote:
> � wrote:
>> On Sun, 2 Jul 2006, Hans Hagen wrote:
>>
>>
>>> David Arnold wrote:
>>>
>>>> \startformula\relax
>>>> [9,\infty)=\{x:\,x\ge 9\}
>>>> \stopformula
>>>>
>>>>
>>> indeed, that's the price to pay for optional arguments
>>>
>>
>> Really? Isn't it rather the price for optional space before the "["?
>>
> for tex:
>
> \bla[
>
> and
>
> \bla [
>
> are the same, i.e. the \cs ends at a non-letter and the space is
> gobbled
>
> Hans
>
> -----------------------------------------------------------------
> Hans Hagen | PRAGMA ADE
> Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
> tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com
> | www.pragma-pod.nl
> -----------------------------------------------------------------
>
> _______________________________________________
> ntg-context mailing list
> ntg-context@ntg.nl
> http://www.ntg.nl/mailman/listinfo/ntg-context
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^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: Malicious little bugger
2006-07-02 23:35 ` David Arnold
@ 2006-07-03 2:29 ` Sanjoy Mahajan
2006-07-03 2:32 ` David Arnold
0 siblings, 1 reply; 12+ messages in thread
From: Sanjoy Mahajan @ 2006-07-03 2:29 UTC (permalink / raw)
>> are the same, i.e. the \cs ends at a non-letter and the space is
>> gobbled
> Can someone give me an example where this happens in either latex or
> tex?
Not sure if this example is what you're looking for, but a typical
case in TeX or LaTeX is:
\TeX has a programming language that only a mother could love.
which should be written as
\TeX{} has a programming language that only a mother could love.
or as
\TeX\ has a ...
-Sanjoy
`Never underestimate the evil of which men of power are capable.'
--Bertrand Russell, _War Crimes in Vietnam_, chapter 1.
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: Malicious little bugger
2006-07-03 2:29 ` Sanjoy Mahajan
@ 2006-07-03 2:32 ` David Arnold
2006-07-03 5:17 ` Aditya Mahajan
2006-07-03 6:26 ` Taco Hoekwater
0 siblings, 2 replies; 12+ messages in thread
From: David Arnold @ 2006-07-03 2:32 UTC (permalink / raw)
Sanjoy,
Of course. Thanks.
But how about an example in latex or tex where a function eats a
brace and crashes, as what happens with this context code:
\placeformula[-]
\startformula
[9,\infty)=\{x:\,x\ge 9\}
\stopformula
I know I've seen this in Latex before, but I can't remember where.
On Jul 2, 2006, at 7:29 PM, Sanjoy Mahajan wrote:
>>> are the same, i.e. the \cs ends at a non-letter and the space is
>>> gobbled
>
>> Can someone give me an example where this happens in either latex or
>> tex?
>
> Not sure if this example is what you're looking for, but a typical
> case in TeX or LaTeX is:
>
> \TeX has a programming language that only a mother could love.
>
> which should be written as
>
> \TeX{} has a programming language that only a mother could love.
>
> or as
>
> \TeX\ has a ...
>
> -Sanjoy
>
> `Never underestimate the evil of which men of power are capable.'
> --Bertrand Russell, _War Crimes in Vietnam_, chapter 1.
> _______________________________________________
> ntg-context mailing list
> ntg-context@ntg.nl
> http://www.ntg.nl/mailman/listinfo/ntg-context
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: Malicious little bugger
2006-07-03 2:32 ` David Arnold
@ 2006-07-03 5:17 ` Aditya Mahajan
2006-07-03 8:43 ` Hans Hagen
2006-07-03 6:26 ` Taco Hoekwater
1 sibling, 1 reply; 12+ messages in thread
From: Aditya Mahajan @ 2006-07-03 5:17 UTC (permalink / raw)
On Sun, 2 Jul 2006, David Arnold wrote:
> Sanjoy,
>
> Of course. Thanks.
>
> But how about an example in latex or tex where a function eats a
> brace and crashes, as what happens with this context code:
>
> \placeformula[-]
> \startformula
> [9,\infty)=\{x:\,x\ge 9\}
> \stopformula
>
> I know I've seen this in Latex before, but I can't remember where.
\begin{equation}
\begin{aligned}
[g,\infty)=\{...\}
\end{aligned}
\end{equation}
The package mathtools enforces that the optional arguments of aligned
et al. should come in the same line, that is
\begin{aligned}[t] takes "t" as an optional arguments which
\begin{aligned}
[t]
does not.
I do not think that this can be ever enforced in Context, because a
lot of Context code is written like
\definesomething
[somename]
[some options]
\dosingleempty et al, could be changed to stop scanning on a newline,
but I am certain it will break some of the internals.
Aditya
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: Malicious little bugger
2006-07-03 2:32 ` David Arnold
2006-07-03 5:17 ` Aditya Mahajan
@ 2006-07-03 6:26 ` Taco Hoekwater
1 sibling, 0 replies; 12+ messages in thread
From: Taco Hoekwater @ 2006-07-03 6:26 UTC (permalink / raw)
David Arnold wrote:
> Sanjoy,
>
> Of course. Thanks.
>
> But how about an example in latex or tex where a function eats a
> brace and crashes, as what happens with this context code:
>
> \placeformula[-]
> \startformula
> [9,\infty)=\{x:\,x\ge 9\}
> \stopformula
>
> I know I've seen this in Latex before, but I can't remember where.
LaTeX's newline -- \\ -- command is infamous for this, esp. because
non-expert users tend to forget it even has an optional argument.
Greetings, Taco
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: Malicious little bugger
2006-07-03 5:17 ` Aditya Mahajan
@ 2006-07-03 8:43 ` Hans Hagen
0 siblings, 0 replies; 12+ messages in thread
From: Hans Hagen @ 2006-07-03 8:43 UTC (permalink / raw)
Aditya Mahajan wrote:
> On Sun, 2 Jul 2006, David Arnold wrote:
>
>
>> Sanjoy,
>>
>> Of course. Thanks.
>>
>> But how about an example in latex or tex where a function eats a
>> brace and crashes, as what happens with this context code:
>>
>> \placeformula[-]
>> \startformula
>> [9,\infty)=\{x:\,x\ge 9\}
>> \stopformula
>>
>> I know I've seen this in Latex before, but I can't remember where.
>>
>
> \begin{equation}
> \begin{aligned}
> [g,\infty)=\{...\}
> \end{aligned}
> \end{equation}
>
> The package mathtools enforces that the optional arguments of aligned
> et al. should come in the same line, that is
>
> \begin{aligned}[t] takes "t" as an optional arguments which
>
> \begin{aligned}
> [t]
>
that only can work if one gives the end of line characters a different
catcode; a side effect is that the lookahead may fail when the formula
is passed in a macro so it will never be robust
> does not.
>
> I do not think that this can be ever enforced in Context, because a
> lot of Context code is written like
>
> \definesomething
> [somename]
> [some options]
>
> \dosingleempty et al, could be changed to stop scanning on a newline,
> but I am certain it will break some of the internals.
>
indeed,
for tex (unless one messes around with the endline char)
\define[]
\define []
\define []
\define
[]
is the same, and in order to be consistent, context even does some
explicit testing so that intermediate newlines and spaces are gobbles
(when non standard), think of:
\define[][]
\define[] []
\define []
[]
why should we treat spaces between \define [] and [] [] differently?
anyhow, it dates back a long time, is rather optimized, and will not change
Hans
^ permalink raw reply [flat|nested] 12+ messages in thread
end of thread, other threads:[~2006-07-03 8:43 UTC | newest]
Thread overview: 12+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2006-07-02 4:36 Malicious little bugger David Arnold
2006-07-02 11:23 ` Hans Hagen
2006-07-02 18:15 ` Peter Münster
2006-07-02 19:01 ` Taco Hoekwater
2006-07-02 19:53 ` Hans Hagen
2006-07-02 20:25 ` Peter Münster
2006-07-02 23:35 ` David Arnold
2006-07-03 2:29 ` Sanjoy Mahajan
2006-07-03 2:32 ` David Arnold
2006-07-03 5:17 ` Aditya Mahajan
2006-07-03 8:43 ` Hans Hagen
2006-07-03 6:26 ` Taco Hoekwater
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