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vendor/rails/actionpack/lib/action_controller/routing/routing_ext.rb

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class Object

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  def to_param

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    to_s

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  end

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end

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class TrueClass

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  def to_param

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    self

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  end

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end

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class FalseClass

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  def to_param

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    self

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  end

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end

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class NilClass

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  def to_param

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    self

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  end

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end

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class Regexp #:nodoc:

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  def number_of_captures

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    Regexp.new("|#{source}").match('').captures.length

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  end

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  def multiline?

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    options & MULTILINE == MULTILINE

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  end

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  class << self

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    def optionalize(pattern)

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      case unoptionalize(pattern)

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        when /\A(.|\(.*\))\Z/ then "#{pattern}?"

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        else "(?:#{pattern})?"

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      end

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    end

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    def unoptionalize(pattern)

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      [/\A\(\?:(.*)\)\?\Z/, /\A(.|\(.*\))\?\Z/].each do |regexp|

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        return $1 if regexp =~ pattern

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      end

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      return pattern

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    end

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  end

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end

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