instiki/vendor/rails/activesupport/lib/active_support/core_ext/range/overlaps.rb

module ActiveSupport #:nodoc:
  module CoreExtensions #:nodoc:
    module Range #:nodoc:
      # Check if Ranges overlap.
      module Overlaps
        # Compare two ranges and see if they overlap eachother
        #  (1..5).overlaps?(4..6) # => true
        #  (1..5).overlaps?(7..9) # => false
        def overlaps?(other)
          include?(other.first) || other.include?(first)
        end
      end
    end
  end
end