From: Richard <RichardDummyMailbox58407@...>
Date: 2006-12-17T13:05:09+09:00
Subject: Re: Trapping error not caught by rescue Exception -- How to?

Hi Daniel,

Thanks for your results.  I suspect you were running on Uni*.  I was
running in SciTE over WindowsXP.

When I ran the program in a Command window,  I saw what the problem is:
 in Windows, the date command waits for keyboard input specifying a new
system date.  That wasn't apparent when I was running under SciTE.

So, all's well in my Ruby sandbox.

Regards,
Richard


Daniel Finnie wrote:
> Ruby doesn't hang when I run that code.
>
> This is the output:
> daniel@daniel-desktop:~$ ruby /tmp/tmp.rb
> expr=5**2, expr.class=String
> eval(expr)=25
> expr=date, expr.class=String
> ERROR: undefined local variable or method `date' for main:Object
> ERROR: undefined method `strip!' for nil:NilClass
> expr=y, expr.class=String
> ERROR: undefined local variable or method `y' for main:Object
> expr=`date`, expr.class=String
> eval(expr)=Sat Dec 16 22:01:37 EST 2006
>
> Richard wrote:
> > Hi,
> >
> > The fourth data line in the program below hangs rather than submitting
> > to the rescue clause.  How can I trap that kind of error?
> >
> > I'm running WinXP-Pro/SP2, Ruby 1.8.2-15, Rails  1.1.6, MySQL
> > 5.0.15-nt, SciTE 1.59
> >
> > TIA,
> > Richard
> >
> > === code start ===
> > begin
> > 	DATA.each do |line|
> > 		var, expr, excess = line.chomp.split(/=/, 3)
> > 		var.strip!; expr.strip!
> > 		puts	"expr=" + expr +  ", expr.class=" +expr.class.to_s
> > 		puts	"eval(expr)="  + eval(expr).to_s
> > 	end
> > rescue Exception => eMsg
> > 	puts "ERROR: " + eMsg
> > 	retry
> > end
> >
> > __END__
> > a = 5**2	=# 25
> > b =date	        =# undefined local variable or method `date' for
> > main:Object
> > c = y		 =# undefined local variable or method `y' for main:Object
> > c =`date`	=# (ruby hangs;  Ctrl-C kills it)
> > === code end ===
> > 
> > 
> >