From: Nikolai Weibull <mailing-lists.ruby-talk@...>
Date: 2005-08-25T03:07:32+09:00
Subject: Re: ruby way for piece of code

Alexandru Popescu wrote:

> I have the following hypothesis: a piece of text containing anywhere a line 
> with the following content:
> 
> [code]
> tags: tagone tagtwo
> [/code]
> 
> with any number of tagnames on that line.
> 
> Finally I want to modify the above text where every tagname is replaced by 
> [[tagname => tagname]]

> 	def prepare_content(new_content)
> 	    updated_content = ""
> 	    new_content.each_line do |line|
> 	        if line !~ /^tags: /i
> 	            updated_content += line
> 	            next
> 		end
> 
> 	        tokens = line.split(%r{\s+})
> 	        depth = 0
> 	        1.upto(tokens.length - 1) do |index|
> 	            if tokens[index][0, 2] == "[["
> 	               	depth += 1
> 	               	next
> 		    end
> 		    if tokens[index][-2, 2] == "]]"
> 			depth -= 1
> 			next
> 		    end
> 	            	
> 		    if depth == 0
> 			page.tags << tokens[index]
> 			regexp = Regexp.new( '\s+(' + tokens[index] + ')\s*')
> 			line.sub!(regexp, ' [[\1 => \1]] ')
> 		    end
> 		end
> 	    end
> 
> 	    new_content += line
> 	end

def prepare_content(new_content)
  updated_content = ""
  new_content.each do |line|
    if line =~ /^tags:\s+/i
      $'.split(/\s+/).each{ |t| updated_content << " [[#{t} => #{t}]]" }
      updated_content << "\n"
    else
      updated_content << line
    end
  end
  updated_content
end

This should do what you want, provided that I understand your
specification.  I don't know where you get that page variable from, so I
didn't include code for it; your code is messy,
        nikolai

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