Trapping error not caught by rescue Exception -- How to?

[Richard]

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 ===

 

[Daniel Finnie]

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]

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