gistfile1.rb

#!/usr/bin/env ruby
# vim: set fileencoding=utf-8:

require "kakasi"
require "MeCab"

class Cambridge
    def initialize
        @mecab_y = MeCab::Tagger.new("-Oyomi")
    end
    def hirakana(str)
        node = @mecab_y.parseToNode(str.encode("EUC-JP"))
        result = "".encode("EUC-JP")
        while node do
            yomi = node.feature.force_encoding("EUC-JP").split(/,/)[5]
            if yomi=="*"
                surface = node.surface.force_encoding("EUC-JP").encode("EUC-JP")
                yomi = Kakasi.kakasi("-JH -oeuc", surface).force_encoding("EUC-JP")
            end
            result += yomi
            node = node.next
        end
        result
    end
    def wakati(str)
        Kakasi.kakasi("-w -oeuc", str.encode("EUC-JP")).force_encoding("EUC-JP").split
    end
    def cambridge(str)
        wakati(str).map{|w| self.hirakana(w)}.map{|k|
            if k.size < 4
                k
            else
                a = k.split(//)
                [a[0], *(a[1..a.size-2].shuffle), a[a.size-1]].join
            end
        }.join(" ")
    end
end
camb = Cambridge.new
ARGF.each do|line|
    puts camb.cambridge(line)
end