From: Michael Selig <redmine@...>
Date: 2008-10-12T08:11:17+09:00
Subject: [ruby-core:19298] [Feature #639] New String#encode_internal method

Feature #639: New String#encode_internal method
http://redmine.ruby-lang.org/issues/show/639

Author: Michael Selig
Status: Open, Priority: Normal
Category: M17N

Now that we have default_internal, I think there needs to be an easy way to check that a string is that encoding and if not transcode it. This is especially needed in libraries and other methods which are expected to return strings in defult_internal encoding if it is set.

Suggested implementation:

class String
  def encode_internal
    intern = Encoding.default_internal
    # Do nothing if default_internal not set
    return self unless intern
    # Do nothing if already in default_internal encoding
    return self if encoding == intern
    # Just use "force_encoding" if compatible eg: ASCII/UTF-8
    return force_encoding(intern) if Encoding.compatible(self, intern) == intern
    # Otherwise transcode
    encode(intern)
  end
end


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