From: "NARUSE, Yui" <naruse@...>
Date: 2008-02-07T08:17:13+09:00
Subject: Re: STDIN encoding differs from default source file encoding

Dave Thomas wrote:
> This seems strange:
> 
> dave[RUBY3/Book 16:03:45] echo 'p __ENCODING__' > t.rb
> dave[RUBY3/Book 16:03:51] ruby t.rb
> #<Encoding:US-ASCII>
> dave[RUBY3/Book 16:03:55] cat t.rb | ruby
> #<Encoding:UTF-8>

This is spec.  STDIN encoding will be locale when no magic comment and 
-K and -E.

Following is the table of default string literal encoding, produced by 
Nakamura. [ruby-dev:33389]

Normal script case            | script encoding | default external |
------------------------------+-----------------+------------------+
no -K -E, no   magic comment  | US-ASCII        | locale           |
no -K -E, have magic comment  | magic comment   | locale           |
have  -E, no   magic comment  | US-ASCII        | -E               |
have  -E, have magic comment  | magic comment   | -E               |
have  -K, no   magic comment  | -K              | -K               |
have  -K, have magic comment  | magic comment   | -K               |


-e and stdin case             | script encoding | default external |
------------------------------+-----------------+------------------+
no -K -E, no   magic comment  | locale          | locale           |
no -K -E, have magic comment  | magic comment   | locale           |
have  -E, no   magic comment  | locale          | -E               |
have  -E, have magic comment  | magic comment   | -E               |
have  -K, no   magic comment  | -K              | -K               |
have  -K, have magic comment  | magic comment   | -K               |

-- 
NARUSE, Yui  <naruse@airemix.com>
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