[Rd] Unbalanced parentheses printed by warnings() crash text editor
maechler at stat.math.ethz.ch
Fri Aug 20 14:29:41 CEST 2004
>>>>> "PD" == Peter Dalgaard <p.dalgaard at biostat.ku.dk>
>>>>> on 20 Aug 2004 12:01:39 +0200 writes:
PD> Duncan Murdoch <murdoch at stats.uwo.ca> writes:
>> >I could have sent this to the ESS or Xemacs devel list, but ESS & Xemacs'
>> >attempt to find balanced parentheses accross many lines seems sensible,
>> >and is needed with very long functions.
>> Yes, it's sensible to try, but it is a bug that they don't fail
PD> (Actually, it is not sensible; ESS should try harder to figure out
PD> what is actually R code. Much as I love ESS, it is a persistent fly in
PD> the ointment when the opening blurb comes up with "for" and "in" in
I'm chiming in, since I have been addressed explicitly here (for
Yes, yes, and yes to Duncan's and Peter's notes:
- This should have gone to the ESS-help mailing list
- it's no bug in R and a bug in ESS/Xemacs (actually a bug in Xemacs combined
with a missing feature in ESS).
For the sake of ESS-help, here's the original message as well:
>>>>> "Mayeul" == Mayeul KAUFFMANN <mayeul.kauffmann at tiscali.fr>
>>>>> on Thu, 19 Aug 2004 23:32:51 +0200 writes:
Mayeul> ... Hope it is the good place for this
Mayeul> (I discuss the question of the right place below).
Mayeul> Most of the time, warnings are more than 1000
[?? you probably mean something like '100', not '1000', right?]
Mayeul> characters long and thus are truncated. Most of the
Mayeul> time, this generates printouts with unbalanced parentheses.
Mayeul> Intelligent text editors which do parentheses
Mayeul> highlighting get very confused with this. After too
Mayeul> many warnings, they give errors, and may even crash.
crashing *must* be a bug of the editor setup (ESS - XEmacs -
Windows), not of R.
Mayeul> Specifically, I use ESS and XEmacs for Windows Users
Mayeul> of R (by John Fox) which is advised to do at
Mayeul> http://ess.r-project.org/ with a buffer for text
Mayeul> editing and an inferior ESS (R) buffer. (I
Mayeul> downloaded the latest Xemacs and ESS a month ago).
Mayeul> After too many warnings (with unbalanced
Mayeul> parentheses), Xemacs swithes to an ESS-error buffer
Mayeul> which says "error Nesting too deep for parser". In
Mayeul> some case, when back in R buffer, typing any letter
Mayeul> switches back to the ESS-error Buffer. In other
Mayeul> case, it simply takes ages (until you kill Xemacs)
Mayeul> or it crashes. In most case, the R process is lost.
Mayeul> I could have sent this to the ESS or Xemacs devel
Mayeul> list, but ESS & Xemacs' attempt to find balanced
Mayeul> parentheses accross many lines seems sensible, and
Mayeul> is needed with very long functions.
Mayeul> A workaround would be to change the function that print warnings.
Mayeul> Instead of, for instance,
Mayeul> "error message xxxxxxxxxx in: function.yyyyyy(zzzzzzzzz,zzzzzzz, ..."
Mayeul> It may print
Mayeul> "error message xxxxxxxxxx in: function.yyyyyy(zzzzzzzzz,zzzzzzz, ...)"
Mayeul> The function should truncate the error message, find
Mayeul> how many parenthesis and brackets are open in the
Mayeul> remaining part, substract the number of closing
Mayeul> parenthesis and brackets, and add that many
Mayeul> parenthesis at the end. (Xemacs parentheses
Mayeul> highligher regards "(" and "[" as equivalent)
Mayeul> Mayeul KAUFFMANN
Mayeul> Univ. Pierre Mendes France
Mayeul> Grenoble - France
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