From: Robert Klemme <bob.news@...>
Date: 2004-09-07T15:50:09+09:00
Subject: Re: include? only true once


"Matthew Margolis" <mrmargolis@wisc.edu> schrieb im Newsbeitrag
news:413CEF14.2070102@wisc.edu...
> David A. Black wrote:
>
> >Hi --
> >
> >On Tue, 7 Sep 2004, Matthew Margolis wrote:
> >
> >
> >
> >>David A. Black wrote:
> >>
> >>
> >>
> >>>Hi --
> >>>
> >>>On Tue, 7 Sep 2004, Matthew Margolis wrote:
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>>blockFile = File.new("blocklist.txt", "a+")
> >>>>print blockFile.read.include?("aa")
> >>>>print blockFile.read.include?("aa")
> >>>>
> >>>>blocklist.txt looks like
> >>>>--------------------------------------------
> >>>>aa
> >>>>ae
> >>>>aj
> >>>>au
> >>>>ae
> >>>>---------------------------------------------
> >>>>
> >>>>
> >>>>Why does #include? return true on the first call only?
> >>>>
> >>>>
> >>>>
> >>>>
> >>>Because you've reached end-of-file :-)
> >>>
> >>>
> >>>David
> >>>
> >>>
> >>>
> >>>
> >>>
> >>blockFile = File.new("blocklist.txt", "a+")
> >> print blockFile.read.include?("aa")
> >> blockFile.lineno = 0
> >> print blockFile.read.include?("aa")
> >>
> >>Still gives true false instead of true true
> >>
> >>
> >
> >I'm ignorant of #lineno= but it doesn't seem to affect EOF.  (If you
> >add an EOF test it will come out true.)  But you could use #pos to get
> >back to the beginning of the stream.
> >
> >
> >David
> >
> >
> >
> Excellent, thank you.
>
> -Matthew Margolis

Why don't you just:

# complete:
content = File.read("blocklist.txt")
print content.include?("aa")
print content.include?("aa")

# line oriented:
content = File.readlines("blocklist.txt")
print content.include?("aa")
print content.include?("aa")


Much more efficient if the file fits into mem.

Kind regards

    robert