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#!/usr/bin/ruby -wrequire 'algorithm/diff'module Diff	class Hunk		attr_reader :type, :content		def initialize(type, content)			@type = type			@content = content		end	end	def Diff.word_diff(s1, s2)		words = [s1, s2].collect { |str| 			str.split(/\b(?=\w)/xm)		}		differences = diff(words[0], words[1])				# Same string		return [ Hunk.new(:both, s1) ] if differences.length == 0			hunks = []		# Adding lengths that are the same involves a similar operation 		# three times.  Using a proc allows knowledge of private		# data without having to make this a class		push_identical = proc { |beginning, ending|			return unless ending - beginning > 1			hunks.push(Hunk.new(:both, words[0][beginning..ending-1].join))		}			# Leading identical stuff		push_identical.call(0, differences[0][1])		differences.each_with_index { |d, i|			hunks.push(Hunk.new(d[0] == :+ ? :right : :left, d[2].join))			push_identical.call(differences[i][1], differences[i + 1][1]) unless differences[i + 1].nil?		}		# Trailing identical stuff		push_identical.call(differences[-1][1] + 1, words[0].length)		return hunks	endend