From: ara.t.howard@...
Date: 2006-09-28T00:35:55+09:00
Subject: Re: problem with ".scan"

On Thu, 28 Sep 2006, Peter Bailey wrote:

> unknown wrote:
>> On Wed, 27 Sep 2006, Peter Bailey wrote:
>>
>>> 11    file_contents = File.read(psfile)
>>> 12    file_contents.scan(/\%\%Pages: (\d{1,5})[ ]+\n/) do
>>
>> the modification is probably here.  can't you show us everything up
>> through
>> the matching end?
>>
>> -a
>
> Sorry. It's a bit much. That's why I was holding back. Here's the whole
> script.

<snip>

> Dir.glob("*.ps").each do |psfile|
>  file_contents = File.read(psfile)
>  file_contents.scan(/\%\%Pages: (\d{1,5})[ ]+\n/) do
>    totalpages = $1
>    if (totalpages.to_i % 2) !=0 then
>      newtotalpages = totalpages.to_i + 1
>      file_contents << "\%\%Blank page for Asura.\n\%\%Page:
                      ^^
                      ^^
                      ^^
                      ^^
                      the modification is question
>       #{newtotalpages.to_i}\nshowpage\n"
>      File.open(psfile, "w") { |f| f.print file_contents }
>      FileUtils.touch(psfile)
>    end

so, ruby is correct, you are modifying a string while in an in-progress scan
block.  easy-cheasy.

kind regards.

-a
-- 
in order to be effective truth must penetrate like an arrow - and that is
likely to hurt. -- wei wu wei