From: kwatch@... (kwatch)
Date: 2002-05-10T10:42:29+09:00
Subject: Re: gets and eof?

ts <decoux@moulon.inra.fr> wrote in message news:<200205091356.g49DuF607972@moulon.inra.fr>...
> 
>  ruby use an active model (is EOF waiting at the stream) rather than a
>  passive model (is EOF has already met the stream)
> 
> 
> Guy Decoux

I tried another program.

    .============================ prog3.rb ==
     loop do
         break if $stdin.eof?
         print "*** 'break if $stdin.eof?' done.\n"
         line = $stdin.gets
         print "*** 'line = $stdin.gets' done.\n"
         puts "<-- #{line}"
         print "*** 'puts <--\#{line}' done, continue loop.\n"
     end
    .========================================

    .----------------------------------------
     % ruby prog3.rb
     hoge
     *** 'break if $stdin.eof?' done.			# Hmm?
     *** 'line = $stdin.gets' done.
     <-- hoge
     *** 'puts <--#{line}' done, continue loop.
     geji
     *** 'break if $stdin.eof?' done.			# Hmm?
     *** 'line = $stdin.gets' done.
     <-- geji
     *** 'puts <--#{line}' done, continue loop.
     ^D
     %
    .----------------------------------------

    .============================= prog4.rb ==
     loop do
         line = $stdin.gets
         print "*** 'line = $stdin.gets' done.\n"
         break if $stdin.eof?
         print "*** 'break if $stdin.eof?' done.\n"
         puts "<-- #{line}"
         print "*** 'puts <--\#{line}' done, continue loop.\n"
     end
    .========================================

    .----------------------------------------
     % ruby prog4.rb
     hoge
     *** 'line = $stdin.gets' done.
     geji
     *** 'break if $stdin.eof?' done.			# Oh!
     <-- hoge
     *** 'puts <--#{line}' done, continue loop.
     *** 'line = $stdin.gets' done.
     bake
     *** 'break if $stdin.eof?' done.			# Oh!
     <-- geji
     *** 'puts <--#{line}' done, continue loop.
     *** 'line = $stdin.gets' done.
     ^D
     %
    .----------------------------------------

It shows that '$stdin.eof?' stops the progress.
Is this what you mean, Guy?

Regards,
kwatch