From: Stefan Rusterholz <apeiros@...>
Date: 2006-08-12T00:59:55+09:00
Subject: Fix for rational.rb (accepting Rationals as num/den)

Hi, Rational currently doesn't accept Rationals as 
Numerator/Denominator. I wrote a patch for it and look for feedback. 
Thanks.

def Rational(a, b = 1)
	Rational.reduce(*Rational.normalize(a,b))
end

class Rational < Numeric
	# normalizes numerator/denominator to non-rationals
	def Rational.normalize(num,den)
		if a.kind_of?(Rational) then
			if b == 1 then
				return [a.nominator, a.denominator]
			elsif b.kind_of?(Rational) then
				return [a.numerator*b.denominator, a.denominator*b.numerator]
			else
				return [a.numerator, a.denominator*b]
			end
		elsif b.kind_of?(Rational) then
			if a == 1 then
				return [b.denominator, b.nominator]
			else
				return [a*b.denominator, b.numerator]
			end
		else
			return [a,b]
		end
	end

  def Rational.new!(num, den = 1)
    new(*Rational.normalize(a,b))
  end
end

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