lib/active_support/core_ext/range/include_range.rb


class Range
  # Extends the default Range#include? to support range comparisons.
  #  (1..5).include?(1..5) # => true
  #  (1..5).include?(2..3) # => true
  #  (1..5).include?(2..6) # => false
  #
  # The native Range#include? behavior is untouched.
  #  ("a".."f").include?("c") # => true
  #  (5..9).include?(11) # => false
  def include_with_range?(value)
    if value.is_a?(::Range)
      operator = exclude_end? ? :< : :<=
      end_value = value.exclude_end? ? last.succ : last
      include_without_range?(value.first) && (value.last <=> end_value).send(operator, 0)
    else
      include_without_range?(value)
    end
  end

  alias_method_chain :include?, :range
end