From: Thomas Sawyer <redmine@...>
Date: 2010-08-31T02:59:29+09:00
Subject: [ruby-core:31954] [Ruby 1.9-Feature#3767][Open] String#scan enumerator?

Feature #3767: String#scan enumerator?
http://redmine.ruby-lang.org/issues/show/3767

Author: Thomas Sawyer
Status: Open, Priority: Normal
Category: lib

Should String#scan return an Enumerator if no block is given?

I came across this issue when testing a String extension I have that works in 1.8, but not 1.9 b/c String is no longer enumerable.

  class String

    # Returns an Enumerator for iterating over each
    # line of the string, stripped of whitespace on
    # either side.
    #
    def cleanlines(&block)
      if block
        scan(/^.*?$/) do |line|
          block.call(line.strip)
        end
      else
        Enumerator.new(self) do |output|
          scan(/^.*?$/) do |line|
            output.yield(line.strip)
          end
        end
      end
    end

  end


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