module ActionView
  module Helpers #:nodoc:
    module NumberHelper
      # Formats a +number+ into a fraction string (i.e. 1 1/3 or 2/9). You can customize the format
      # in the +options+ hash.
      #
			# *NOTE*: This function only supports the "pretty printing" of factions less than 1/10th.
			#
      # ==== Options
      # * *precision* - Options. Sets the level of precision. Defaults to 3.
      #
      # ==== Examples
      #  number_to_fraction 0.25 # => 1/4
      #  number_to_fraction 1.375 # => 1 3/8
      #  number_to_fraction 5.22 # => 5 2/9
      #  number_to_fraction 3.55 :precision => 2 # 3 => 5/9
			def number_to_fraction number = '', options = {}
				number = number.to_s.strip
				options.reverse_merge! :precision => 3
				whole, numerator, denominator = nil
				if number.include? '.'
					whole, numerator = number.split '.'
					rational = Rational(numerator.ljust(options[:precision], '0').to_i, (10 ** options[:precision]))
					# Check for repeating/complex decimals - yeah, this solution is lame.
					case
					when !numerator.match(/^33+/).nil? then numerator, denominator = 1, 3 
					when !numerator.match(/^66+/).nil? then numerator, denominator = 2, 3
					when !numerator.match(/^1{1}6+/).nil? then numerator, denominator = 1, 6
					when !numerator.match(/^8{1}3+/).nil? then numerator, denominator = 5, 6
					when !numerator.match(/^142/).nil? then numerator, denominator = 1, 7
					when !numerator.match(/^285/).nil? then numerator, denominator = 2, 7
					when !numerator.match(/^428/).nil? then numerator, denominator = 3, 7
					when !numerator.match(/^571/).nil? then numerator, denominator = 4, 7
					when !numerator.match(/^714/).nil? then numerator, denominator = 5, 7
					when !numerator.match(/^857/).nil? then numerator, denominator = 6, 7
					when !numerator.match(/^125/).nil? then numerator, denominator = 1, 8
					when !numerator.match(/^375/).nil? then numerator, denominator = 3, 8
					when !numerator.match(/^625/).nil? then numerator, denominator = 5, 8
					when !numerator.match(/^875/).nil? then numerator, denominator = 7, 8
					when !numerator.match(/^11+/).nil? then numerator, denominator = 1, 9
					when !numerator.match(/^22+/).nil? then numerator, denominator = 2, 9
					when !numerator.match(/^44+/).nil? then numerator, denominator = 4, 9
					when !numerator.match(/^55+/).nil? then numerator, denominator = 5, 9
					when !numerator.match(/^77+/).nil? then numerator, denominator = 7, 9
					when !numerator.match(/^88+/).nil? then numerator, denominator = 8, 9
					else numerator, denominator = rational.numerator, rational.denominator
					end
				else
					whole = number
				end
				whole = nil if whole == '0' && numerator
				[whole, [numerator, denominator].compact * '/'].compact.join(' ').strip
			end
    end
  end
end