From: "Radosław Bułat" <radek.bulat@...>
Date: 2011-02-25T18:14:18+09:00
Subject: [ruby-core:35377] [Ruby 1.9 - Feature #4447] add String#byteslice() method


Issue #4447 has been updated by Rados��aw Bu��at.


Hm, can't you just force it to binary encoding?

  >> s = "������"
  => "������"
  >> s.slice(1,2)
  => "����"
  >> s.force_encoding("binary").slice(1,2)
  => "\x85\xC4"

----------------------------------------
Feature #4447: add String#byteslice() method
http://redmine.ruby-lang.org/issues/4447

Author: Suraj Kurapati
Status: Open
Priority: Normal
Assignee: 
Category: 
Target version: 


Please add a String#byteslice() method to the Ruby 1.9 core API.

Without that method, I am forced to *inefficiently* perform byte-based
string slicing by (1) unpacking the entire string into an Array (with
String#unpack or worse: my_string.bytes.to_a) then (2) slicing that 
Array and finally (3) joining the sliced Array into a string (with 
Array#pack or worse: my_array.map(&:chr).join), all as shown below:

  class String
    unless method_defined? :byteslice
      ##
      # Does the same thing as String#slice but
      # operates on bytes instead of characters.
      #
      def byteslice(*args)
        unpack('C*').slice(*args).pack('C*')
      end
    end
  end

Thanks for your consideration.


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