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diff --git a/jni/ruby/lib/pp.rb b/jni/ruby/lib/pp.rb
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+require 'prettyprint'
+
+module Kernel
+  # Returns a pretty printed object as a string.
+  #
+  # In order to use this method you must first require the PP module:
+  #
+  #   require 'pp'
+  #
+  # See the PP module for more information.
+  def pretty_inspect
+    PP.pp(self, '')
+  end
+
+  private
+  # prints arguments in pretty form.
+  #
+  # pp returns argument(s).
+  def pp(*objs) # :nodoc:
+    objs.each {|obj|
+      PP.pp(obj)
+    }
+    objs.size <= 1 ? objs.first : objs
+  end
+  module_function :pp # :nodoc:
+end
+
+##
+# A pretty-printer for Ruby objects.
+#
+# All examples assume you have loaded the PP class with:
+#   require 'pp'
+#
+##
+# == What PP Does
+#
+# Standard output by #p returns this:
+#   #<PP:0x81fedf0 @genspace=#<Proc:0x81feda0>, @group_queue=#<PrettyPrint::GroupQueue:0x81fed3c @queue=[[#<PrettyPrint::Group:0x81fed78 @breakables=[], @depth=0, @break=false>], []]>, @buffer=[], @newline="\n", @group_stack=[#<PrettyPrint::Group:0x81fed78 @breakables=[], @depth=0, @break=false>], @buffer_width=0, @indent=0, @maxwidth=79, @output_width=2, @output=#<IO:0x8114ee4>>
+#
+# Pretty-printed output returns this:
+#   #<PP:0x81fedf0
+#    @buffer=[],
+#    @buffer_width=0,
+#    @genspace=#<Proc:0x81feda0>,
+#    @group_queue=
+#     #<PrettyPrint::GroupQueue:0x81fed3c
+#      @queue=
+#       [[#<PrettyPrint::Group:0x81fed78 @break=false, @breakables=[], @depth=0>],
+#        []]>,
+#    @group_stack=
+#     [#<PrettyPrint::Group:0x81fed78 @break=false, @breakables=[], @depth=0>],
+#    @indent=0,
+#    @maxwidth=79,
+#    @newline="\n",
+#    @output=#<IO:0x8114ee4>,
+#    @output_width=2>
+#
+##
+# == Usage
+#
+#   pp(obj)             #=> obj
+#   pp obj              #=> obj
+#   pp(obj1, obj2, ...) #=> [obj1, obj2, ...]
+#   pp()                #=> nil
+#
+# Output <tt>obj(s)</tt> to <tt>$></tt> in pretty printed format.
+#
+# It returns <tt>obj(s)</tt>.
+#
+##
+# == Output Customization
+#
+# To define a customized pretty printing function for your classes,
+# redefine method <code>#pretty_print(pp)</code> in the class.
+#
+# <code>#pretty_print</code> takes the +pp+ argument, which is an instance of the PP class.
+# The method uses #text, #breakable, #nest, #group and #pp to print the
+# object.
+#
+##
+# == Pretty-Print JSON
+#
+# To pretty-print JSON refer to JSON#pretty_generate.
+#
+##
+# == Author
+# Tanaka Akira <akr@fsij.org>
+
+class PP < PrettyPrint
+  # Outputs +obj+ to +out+ in pretty printed format of
+  # +width+ columns in width.
+  #
+  # If +out+ is omitted, <code>$></code> is assumed.
+  # If +width+ is omitted, 79 is assumed.
+  #
+  # PP.pp returns +out+.
+  def PP.pp(obj, out=$>, width=79)
+    q = PP.new(out, width)
+    q.guard_inspect_key {q.pp obj}
+    q.flush
+    #$pp = q
+    out << "\n"
+  end
+
+  # Outputs +obj+ to +out+ like PP.pp but with no indent and
+  # newline.
+  #
+  # PP.singleline_pp returns +out+.
+  def PP.singleline_pp(obj, out=$>)
+    q = SingleLine.new(out)
+    q.guard_inspect_key {q.pp obj}
+    q.flush
+    out
+  end
+
+  # :stopdoc:
+  def PP.mcall(obj, mod, meth, *args, &block)
+    mod.instance_method(meth).bind(obj).call(*args, &block)
+  end
+  # :startdoc:
+
+  @sharing_detection = false
+  class << self
+    # Returns the sharing detection flag as a boolean value.
+    # It is false by default.
+    attr_accessor :sharing_detection
+  end
+
+  module PPMethods
+
+    # Yields to a block
+    # and preserves the previous set of objects being printed.
+    def guard_inspect_key
+      if Thread.current[:__recursive_key__] == nil
+        Thread.current[:__recursive_key__] = {}.taint
+      end
+
+      if Thread.current[:__recursive_key__][:inspect] == nil
+        Thread.current[:__recursive_key__][:inspect] = {}.taint
+      end
+
+      save = Thread.current[:__recursive_key__][:inspect]
+
+      begin
+        Thread.current[:__recursive_key__][:inspect] = {}.taint
+        yield
+      ensure
+        Thread.current[:__recursive_key__][:inspect] = save
+      end
+    end
+
+    # Check whether the object_id +id+ is in the current buffer of objects
+    # to be pretty printed. Used to break cycles in chains of objects to be
+    # pretty printed.
+    def check_inspect_key(id)
+      Thread.current[:__recursive_key__] &&
+      Thread.current[:__recursive_key__][:inspect] &&
+      Thread.current[:__recursive_key__][:inspect].include?(id)
+    end
+
+    # Adds the object_id +id+ to the set of objects being pretty printed, so
+    # as to not repeat objects.
+    def push_inspect_key(id)
+      Thread.current[:__recursive_key__][:inspect][id] = true
+    end
+
+    # Removes an object from the set of objects being pretty printed.
+    def pop_inspect_key(id)
+      Thread.current[:__recursive_key__][:inspect].delete id
+    end
+
+    # Adds +obj+ to the pretty printing buffer
+    # using Object#pretty_print or Object#pretty_print_cycle.
+    #
+    # Object#pretty_print_cycle is used when +obj+ is already
+    # printed, a.k.a the object reference chain has a cycle.
+    def pp(obj)
+      id = obj.object_id
+
+      if check_inspect_key(id)
+        group {obj.pretty_print_cycle self}
+        return
+      end
+
+      begin
+        push_inspect_key(id)
+        group {obj.pretty_print self}
+      ensure
+        pop_inspect_key(id) unless PP.sharing_detection
+      end
+    end
+
+    # A convenience method which is same as follows:
+    #
+    #   group(1, '#<' + obj.class.name, '>') { ... }
+    def object_group(obj, &block) # :yield:
+      group(1, '#<' + obj.class.name, '>', &block)
+    end
+
+    # A convenience method, like object_group, but also reformats the Object's
+    # object_id.
+    def object_address_group(obj, &block)
+      str = Kernel.instance_method(:to_s).bind(obj).call
+      str.chomp!('>')
+      group(1, str, '>', &block)
+    end
+
+    # A convenience method which is same as follows:
+    #
+    #   text ','
+    #   breakable
+    def comma_breakable
+      text ','
+      breakable
+    end
+
+    # Adds a separated list.
+    # The list is separated by comma with breakable space, by default.
+    #
+    # #seplist iterates the +list+ using +iter_method+.
+    # It yields each object to the block given for #seplist.
+    # The procedure +separator_proc+ is called between each yields.
+    #
+    # If the iteration is zero times, +separator_proc+ is not called at all.
+    #
+    # If +separator_proc+ is nil or not given,
+    # +lambda { comma_breakable }+ is used.
+    # If +iter_method+ is not given, :each is used.
+    #
+    # For example, following 3 code fragments has similar effect.
+    #
+    #   q.seplist([1,2,3]) {|v| xxx v }
+    #
+    #   q.seplist([1,2,3], lambda { q.comma_breakable }, :each) {|v| xxx v }
+    #
+    #   xxx 1
+    #   q.comma_breakable
+    #   xxx 2
+    #   q.comma_breakable
+    #   xxx 3
+    def seplist(list, sep=nil, iter_method=:each) # :yield: element
+      sep ||= lambda { comma_breakable }
+      first = true
+      list.__send__(iter_method) {|*v|
+        if first
+          first = false
+        else
+          sep.call
+        end
+        yield(*v)
+      }
+    end
+
+    # A present standard failsafe for pretty printing any given Object
+    def pp_object(obj)
+      object_address_group(obj) {
+        seplist(obj.pretty_print_instance_variables, lambda { text ',' }) {|v|
+          breakable
+          v = v.to_s if Symbol === v
+          text v
+          text '='
+          group(1) {
+            breakable ''
+            pp(obj.instance_eval(v))
+          }
+        }
+      }
+    end
+
+    # A pretty print for a Hash
+    def pp_hash(obj)
+      group(1, '{', '}') {
+        seplist(obj, nil, :each_pair) {|k, v|
+          group {
+            pp k
+            text '=>'
+            group(1) {
+              breakable ''
+              pp v
+            }
+          }
+        }
+      }
+    end
+  end
+
+  include PPMethods
+
+  class SingleLine < PrettyPrint::SingleLine # :nodoc:
+    include PPMethods
+  end
+
+  module ObjectMixin # :nodoc:
+    # 1. specific pretty_print
+    # 2. specific inspect
+    # 3. generic pretty_print
+
+    # A default pretty printing method for general objects.
+    # It calls #pretty_print_instance_variables to list instance variables.
+    #
+    # If +self+ has a customized (redefined) #inspect method,
+    # the result of self.inspect is used but it obviously has no
+    # line break hints.
+    #
+    # This module provides predefined #pretty_print methods for some of
+    # the most commonly used built-in classes for convenience.
+    def pretty_print(q)
+      method_method = Object.instance_method(:method).bind(self)
+      begin
+        inspect_method = method_method.call(:inspect)
+      rescue NameError
+      end
+      if inspect_method && /\(Kernel\)#/ !~ inspect_method.inspect
+        q.text self.inspect
+      elsif !inspect_method && self.respond_to?(:inspect)
+        q.text self.inspect
+      else
+        q.pp_object(self)
+      end
+    end
+
+    # A default pretty printing method for general objects that are
+    # detected as part of a cycle.
+    def pretty_print_cycle(q)
+      q.object_address_group(self) {
+        q.breakable
+        q.text '...'
+      }
+    end
+
+    # Returns a sorted array of instance variable names.
+    #
+    # This method should return an array of names of instance variables as symbols or strings as:
+    # +[:@a, :@b]+.
+    def pretty_print_instance_variables
+      instance_variables.sort
+    end
+
+    # Is #inspect implementation using #pretty_print.
+    # If you implement #pretty_print, it can be used as follows.
+    #
+    #   alias inspect pretty_print_inspect
+    #
+    # However, doing this requires that every class that #inspect is called on
+    # implement #pretty_print, or a RuntimeError will be raised.
+    def pretty_print_inspect
+      if /\(PP::ObjectMixin\)#/ =~ Object.instance_method(:method).bind(self).call(:pretty_print).inspect
+        raise "pretty_print is not overridden for #{self.class}"
+      end
+      PP.singleline_pp(self, '')
+    end
+  end
+end
+
+class Array # :nodoc:
+  def pretty_print(q) # :nodoc:
+    q.group(1, '[', ']') {
+      q.seplist(self) {|v|
+        q.pp v
+      }
+    }
+  end
+
+  def pretty_print_cycle(q) # :nodoc:
+    q.text(empty? ? '[]' : '[...]')
+  end
+end
+
+class Hash # :nodoc:
+  def pretty_print(q) # :nodoc:
+    q.pp_hash self
+  end
+
+  def pretty_print_cycle(q) # :nodoc:
+    q.text(empty? ? '{}' : '{...}')
+  end
+end
+
+class << ENV # :nodoc:
+  def pretty_print(q) # :nodoc:
+    h = {}
+    ENV.keys.sort.each {|k|
+      h[k] = ENV[k]
+    }
+    q.pp_hash h
+  end
+end
+
+class Struct # :nodoc:
+  def pretty_print(q) # :nodoc:
+    q.group(1, sprintf("#<struct %s", PP.mcall(self, Kernel, :class).name), '>') {
+      q.seplist(PP.mcall(self, Struct, :members), lambda { q.text "," }) {|member|
+        q.breakable
+        q.text member.to_s
+        q.text '='
+        q.group(1) {
+          q.breakable ''
+          q.pp self[member]
+        }
+      }
+    }
+  end
+
+  def pretty_print_cycle(q) # :nodoc:
+    q.text sprintf("#<struct %s:...>", PP.mcall(self, Kernel, :class).name)
+  end
+end
+
+class Range # :nodoc:
+  def pretty_print(q) # :nodoc:
+    q.pp self.begin
+    q.breakable ''
+    q.text(self.exclude_end? ? '...' : '..')
+    q.breakable ''
+    q.pp self.end
+  end
+end
+
+class File < IO # :nodoc:
+  class Stat # :nodoc:
+    def pretty_print(q) # :nodoc:
+      require 'etc.so'
+      q.object_group(self) {
+        q.breakable
+        q.text sprintf("dev=0x%x", self.dev); q.comma_breakable
+        q.text "ino="; q.pp self.ino; q.comma_breakable
+        q.group {
+          m = self.mode
+          q.text sprintf("mode=0%o", m)
+          q.breakable
+          q.text sprintf("(%s %c%c%c%c%c%c%c%c%c)",
+            self.ftype,
+            (m & 0400 == 0 ? ?- : ?r),
+            (m & 0200 == 0 ? ?- : ?w),
+            (m & 0100 == 0 ? (m & 04000 == 0 ? ?- : ?S) :
+                             (m & 04000 == 0 ? ?x : ?s)),
+            (m & 0040 == 0 ? ?- : ?r),
+            (m & 0020 == 0 ? ?- : ?w),
+            (m & 0010 == 0 ? (m & 02000 == 0 ? ?- : ?S) :
+                             (m & 02000 == 0 ? ?x : ?s)),
+            (m & 0004 == 0 ? ?- : ?r),
+            (m & 0002 == 0 ? ?- : ?w),
+            (m & 0001 == 0 ? (m & 01000 == 0 ? ?- : ?T) :
+                             (m & 01000 == 0 ? ?x : ?t)))
+        }
+        q.comma_breakable
+        q.text "nlink="; q.pp self.nlink; q.comma_breakable
+        q.group {
+          q.text "uid="; q.pp self.uid
+          begin
+            pw = Etc.getpwuid(self.uid)
+          rescue ArgumentError
+          end
+          if pw
+            q.breakable; q.text "(#{pw.name})"
+          end
+        }
+        q.comma_breakable
+        q.group {
+          q.text "gid="; q.pp self.gid
+          begin
+            gr = Etc.getgrgid(self.gid)
+          rescue ArgumentError
+          end
+          if gr
+            q.breakable; q.text "(#{gr.name})"
+          end
+        }
+        q.comma_breakable
+        q.group {
+          q.text sprintf("rdev=0x%x", self.rdev)
+          if self.rdev_major && self.rdev_minor
+            q.breakable
+            q.text sprintf('(%d, %d)', self.rdev_major, self.rdev_minor)
+          end
+        }
+        q.comma_breakable
+        q.text "size="; q.pp self.size; q.comma_breakable
+        q.text "blksize="; q.pp self.blksize; q.comma_breakable
+        q.text "blocks="; q.pp self.blocks; q.comma_breakable
+        q.group {
+          t = self.atime
+          q.text "atime="; q.pp t
+          q.breakable; q.text "(#{t.tv_sec})"
+        }
+        q.comma_breakable
+        q.group {
+          t = self.mtime
+          q.text "mtime="; q.pp t
+          q.breakable; q.text "(#{t.tv_sec})"
+        }
+        q.comma_breakable
+        q.group {
+          t = self.ctime
+          q.text "ctime="; q.pp t
+          q.breakable; q.text "(#{t.tv_sec})"
+        }
+      }
+    end
+  end
+end
+
+class MatchData # :nodoc:
+  def pretty_print(q) # :nodoc:
+    nc = []
+    self.regexp.named_captures.each {|name, indexes|
+      indexes.each {|i| nc[i] = name }
+    }
+    q.object_group(self) {
+      q.breakable
+      q.seplist(0...self.size, lambda { q.breakable }) {|i|
+        if i == 0
+          q.pp self[i]
+        else
+          if nc[i]
+            q.text nc[i]
+          else
+            q.pp i
+          end
+          q.text ':'
+          q.pp self[i]
+        end
+      }
+    }
+  end
+end
+
+class Object < BasicObject # :nodoc:
+  include PP::ObjectMixin
+end
+
+[Numeric, Symbol, FalseClass, TrueClass, NilClass, Module].each {|c|
+  c.class_eval {
+    def pretty_print_cycle(q)
+      q.text inspect
+    end
+  }
+}
+
+[Numeric, FalseClass, TrueClass, Module].each {|c|
+  c.class_eval {
+    def pretty_print(q)
+      q.text inspect
+    end
+  }
+}