From: Vahagn Hayrapetyan <vahagnh@...>
Date: 2011-04-09T03:19:17+09:00
Subject: Calling to_enum on a MatchData object

Hi, I have the following snippet of code:

def x
  File.open('screen.css') do |f|
    while line = f.gets
      file = line.match(/"(\w*.css)"/)
      puts file.class #MatchData
      puts file.methods #to_enum defined
      e = file.to_enum
      puts e.class #Enumerator
      puts e.methods #each method defined
      e.each do |entry|:
         puts entry
      end
    end
  end
end

The result of the regex operation gets stored in "file" as a MatchData
object. Then I convert it to an Enumerator object, which by all accounts
has an each method defined. Yet when I try to "e.each" here's what I
get:

undefined method `each' for #<MatchData "\"reset.css\"" 1:"reset.css">
(NoMethodError).

Then I check the docs for the MatchData class:
http://www.ruby-doc.org/core/classes/MatchData.html

and find that no, "to_enum" isn't defined. But then I don't understand
why
file.methods lists it, and why no error is generated when I call
file.to_enum.

Help really appreciated.

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