From: Dmitry Severin <dmitry.severin@...>
Date: 2006-06-21T23:56:47+09:00
Subject: Re: Unicode roadmap?

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On 6/21/06, Yukihiro Matsumoto <matz@ruby-lang.org> wrote:
>
>
> For only rare case, there might be need to handle multiple encoding in
> an application.  I do want to allow it.  But I am not sure how we can
> help that kind of applications, since they are fundamentally complex.
> And we don't have enough experience to design a framework for such
> applications.
>
>

I can see one more problem with setting encoding per file and tagging
accordingly string literals in it.
If operations on strings with different encodings will always throw an
exception, problems can raise when one calls such third-party library from
script with different encoding.

Here's small example:

library code in file some_utility.rb:
# -*- coding: EUC-JP -*-
module SomeUtility
  def SomeUtility.fancy_format(str)
    "<text>" + str + "</text>" # these literals are tagged as EUC-JP, right?
  end
end

application code in file my_app.rb:
# -*- coding: UTF-8 -*-
require 'some_utility'
puts SomeUtility.fancy_format("an utf8 string")  # this literal is tagged as
UTF8

If the last call will throw some kind of EncodingMismatchError, how to deal
with that?

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