Re: How to do this debugging?

< ^ > P N |<>|^_>< --- | ~ ...Help
Dale,

Something odd here - see below . .


On Tue, 2006-06-20 at 23:54 +0900, Dale Martenson wrote:
> Philip Rhoades wrote:
> > Dale, Darren,
> > 
> > 
> > On Tue, 2006-06-20 at 05:04 +0900, Dale Martenson wrote:
> >> > 
> >>         $stdin = IO.popen("cat parsefile")
> >> 
> >> You can now start debugging. All input will be read from the result of 
> >> the IO.popen call.
> >> 
> >> --Dale Martenson
> > 
> > 
> > Using both this method and:
> > 
> > 	ruby -r debug t1.rb < parsefile  (which I had already tried)
> > 
> > do strange things - eg:
> > 
> > [root@prix bin]# ruby -r debug t1.rb
> > Debug.rb
> > Emacs support available.
> > 
> > t1.rb:6:require 'ftools'
> > (rdb:1) $stdin = IO.popen("cat t")
> > #<IO:0xb7f16708>
> > (rdb:1) Received: from localhost (HELO localhost.localdomain)
> > (127.0.0.1)  by prix.pricom.com.au with SMTP; 20 Jun 2006 08:11:43 -0000
> > t1.rb:6:compile error
> > t1.rb:6: syntax error, unexpected ':', expecting $end
> > .
> > .
> > similar repeated errors for the rest of the parsefile ('t")
> > 
> > 
> > The top of t1.rb looks like:
> > 
> > #!/usr/bin/ruby
> > #   qmail-pfilter.rb
> > #   v1.1
> > #   2006-03-14
> > 
> > require 'ftools'  (line 6)
> > 
> > The first line of the mail item - text file "t" (parsefile) is read in
> > and then I get the compile/syntax errors - these continue for the whole
> > of the rest of the text file but I need to be able to step through the
> > program one line at a time from the parsefile . .
> > 
> > What is going on?
> > 
> 
> I don't know. I am not sure what your program is doing. Is there anyway 
> you could share the source. Or could you reduce the program down to a 
> simple case that still causes the problem.
> 
> Here is a very simple program that attempts to show a couple of things.
> 
> 1. I required 'ftools' since that seems to be where you are getting into 
> trouble. It is not needed by the program. Then stepped in the debugger 
> to see what happens when the "require 'ftools'" line is processed. You 
> should do the same.
> 
> 2. The program takes the piped input and burps it back out again with a 
> prefix. The input is just the program source itself.
> 
> ------ d.rb ------
> 
> #!/usr/bin/env ruby
> 
> require 'ftools'
> 
> $stdin.each_line do |line|
>         puts "BUBBA: "+line
> end
> puts "BUBBA END."
> 
> ------ EOF ------
> 
> Here is my output when I stepped through the program in the debugger.
> 
> ------ output ------
> 
> # ruby -r debug d.rb
> Debug.rb
> Emacs support available.
> 
> d.rb:3:require 'ftools'
> (rdb:1) $stdin = IO.popen( "cat d.rb" )
> #<IO:0x401f5f40>
> (rdb:1) s
> /usr/lib/ruby/1.8/ftools.rb:1:class << File
> (rdb:1) s
> /usr/lib/ruby/1.8/ftools.rb:3:  BUFSIZE = 8 * 1024
> (rdb:1) s
> /usr/lib/ruby/1.8/ftools.rb:5:  def catname from, to
> (rdb:1) s
> /usr/lib/ruby/1.8/ftools.rb:15:  def syscopy from, to
> (rdb:1) s
> /usr/lib/ruby/1.8/ftools.rb:41:  def copy from, to, verbose = false
> (rdb:1) s
> /usr/lib/ruby/1.8/ftools.rb:46:  alias cp copy
> (rdb:1) s
> /usr/lib/ruby/1.8/ftools.rb:50:  def move from, to, verbose = false
> (rdb:1) s
> /usr/lib/ruby/1.8/ftools.rb:75:  alias mv move
> (rdb:1) s
> /usr/lib/ruby/1.8/ftools.rb:81:  def compare from, to, verbose = false
> (rdb:1) s
> /usr/lib/ruby/1.8/ftools.rb:112:  alias cmp compare
> (rdb:1) s
> /usr/lib/ruby/1.8/ftools.rb:116:  def safe_unlink(*files)
> (rdb:1) s
> /usr/lib/ruby/1.8/ftools.rb:127:  alias rm_f safe_unlink
> (rdb:1) s
> /usr/lib/ruby/1.8/ftools.rb:129:  def makedirs(*dirs)
> (rdb:1) s
> /usr/lib/ruby/1.8/ftools.rb:148:  alias mkpath makedirs
> (rdb:1) s
> /usr/lib/ruby/1.8/ftools.rb:150:  alias o_chmod chmod
> (rdb:1) s
> /usr/lib/ruby/1.8/ftools.rb:152:  vsave, $VERBOSE = $VERBOSE, false
> (rdb:1) s
> /usr/lib/ruby/1.8/ftools.rb:153:  def chmod(mode, *files)
> (rdb:1) s
> /usr/lib/ruby/1.8/ftools.rb:158:  $VERBOSE = vsave
> (rdb:1) s
> /usr/lib/ruby/1.8/ftools.rb:160:  def install(from, to, mode = nil, 
> verbose = false)
> (rdb:1) s
> d.rb:5:$stdin.each_line do |line|
> (rdb:1) s
> d.rb:6: puts "BUBBA: "+line
> (rdb:1) s
> BUBBA: #!/usr/bin/env ruby
> d.rb:6: puts "BUBBA: "+line
> (rdb:1) s
> BUBBA:
> d.rb:6: puts "BUBBA: "+line
> (rdb:1) s
> BUBBA: require 'ftools'
> d.rb:6: puts "BUBBA: "+line
> (rdb:1) s
> BUBBA:
> d.rb:6: puts "BUBBA: "+line
> (rdb:1) s
> BUBBA: $stdin.each_line do |line|
> d.rb:6: puts "BUBBA: "+line
> (rdb:1) s
> BUBBA:  puts "BUBBA: "+line
> d.rb:6: puts "BUBBA: "+line
> (rdb:1) s
> BUBBA: end
> d.rb:6: puts "BUBBA: "+line
> (rdb:1) s
> BUBBA: puts "BUBBA END."
> d.rb:8:puts "BUBBA END."
> (rdb:1) s
> BUBBA END.
> #
> 
> ------ EOF ------
> 
> You should attempt to step through your program to see what happens. You 
> may want to turn on trace.


[root@prix bin]# ruby -r debug debugtst.rb
Debug.rb
Emacs support available.

debugtst.rb:3:require 'ftools'
(rdb:1) $stdin = IO.popen( "cat debugtst.rb" )
#<IO:0xb7f676c8>
(rdb:1) #!/usr/bin/env ruby
nil
(rdb:1) 
#!/usr/bin/env ruby
nil
(rdb:1) require 'ftools'
true
(rdb:1) 
require 'ftools'
false
(rdb:1) $stdin.each_line do |line|
debugtst.rb:3:compile error
debugtst.rb:3: syntax error, unexpected $end
$stdin.each_line do |line|
                          ^
(rdb:1)         puts "BUBBA: "+line
debugtst.rb:3:undefined local variable or method `line' for main:Object
(rdb:1) end
debugtst.rb:3:compile error
debugtst.rb:3: syntax error, unexpected kEND
(rdb:1) puts "BUBBA END."
BUBBA END.
nil
(rdb:1) 
puts "BUBBA END."
BUBBA END.
nil
(rdb:1) 
puts "BUBBA END."
BUBBA END.
nil
(rdb:1) 
puts "BUBBA END."
BUBBA END.
nil
(rdb:1) 


I don't get the chance to step . . it looks like something peculiar to
my system (FC5 + latest Ruby) . . any idea what?

Thanks,

Phil.
-- 
Philip Rhoades

Pricom Pty Limited  (ACN 003 252 275  ABN 91 003 252 275)
GPO Box 3411
Sydney NSW      2001
Australia
Mobile:  +61:(0)411-185-652
Fax:     +61:(0)2-8221-9599
E-mail:  phil / pricom.com.au