From: Robert Klemme <shortcutter@...>
Date: 2010-03-27T07:05:08+09:00
Subject: Re: index of string from beginning of line vs beginning of file

On 03/26/2010 09:48 PM, Jesús Gabriel y Galán wrote:
> On Fri, Mar 26, 2010 at 5:17 PM, Jesse B. <jessebos@aol.com> wrote:
>> Thank You Robert,
>> I tried running this and unfortunately it shows the line break (newline)
>> with or without the leading space before the "comment".
>>
>> So I think Jesus is unto something with the "joined the array before
>> writing it because puts with an array prints a newline between each
>> element."
>>
>> Now I just need to figure out how to have it not do the newline when
>> there are spaces before the "comment"
>> thanks for your time.
> 
> I think there's no solution to that. I mean, the requirement is to
> remove what's inside the comments, and that leaves a line with a
> single space. Both my solution and Robert's do exactly that (I think
> Robert's solution is the better one).
> 
> What you are asking now is for an additional condition, that it might
> be that if after removing the comments there's an empty line (a line
> with only spaces), that should be removed too.
> 
> content = File.read "input.txt"
> content.gsub! %r{--/.*?/--}m, ''
> content.gsub! %r{\A\s+\z}, '' # untested and i think you might to
> remove a \n in this case too, give it a try.
> 
> File.open "output.txt", "w" do |out|
>    out.write content
> end
> 
> 
> Or maybe the condition is to remove all the whitespace and \n that
> surround the comments.
> 
> content = File.read "input.txt"
> content.gsub! %r{[\n\s]*--/.*?/--[\n\s]*}m, ''   #untested also, but
> you get the idea.
> 
> File.open "output.txt", "w" do |out|
>    out.write content
> end
> 
> Hope this helps,

A bit more to play with

content = File.read "input.txt"
content.gsub! %r{^[ \t]*--/(?:.(?!/--))*.?/--\s*?$\s}m, ''
content.gsub! %r{[ \t]*--/(?:.(?!/--))*.?/--[ \t]*}m, ' '

File.open "output.txt", "w" do |out|
   out.write content
end


I used this for testing:


robert@fussel:~$ cat input.txt
1. before after
X1.1
before --/ comment
comment /-- after
X1.2
2. before
X2.1
before --/ comment
comment /--
X2.2
3. after
X3.1
    --/ comment
comment /-- after
X3.2
4. -
X4.1
    --/ comment
comment /--
X4.2
5. end
robert@fussel:~$

;-)

Cheers

	robert

-- 
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/