[ruby-core:64038] [CommonRuby - Feature #10084] Add Unicode String Normalization to String class

Issue #10084 has been updated by Yukihiro Matsumoto.


First of all, I don't think `normalize` is the best name.
I propose `unicode_normalize` instead, since this normalization is sort of unicode specific.

We still need to define the detail.

It should raise an exception for non Unicode strings.  It shouldn't convert to UTF-8 implicitly inside.

Matz.


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Feature #10084: Add Unicode String Normalization to String class
https://bugs.ruby-lang.org/issues/10084#change-48051

* Author: Martin Dテシrst
* Status: Open
* Priority: Normal
* Assignee: 
* Category: 
* Target version: 
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Unicode string normalization is a frequent operation when comparing or normalizing strings.

This should be available directly on the String class.

The proposed syntax is:

   'string'.normalize       # normalize 'string' according to NFC (most frequent on the Web)
   'string'.normalize :nfc  # normalize 'string' according to NFC; :nfd, :nfkc, :nfkd also usable
   'string'.nfc             # shorter variant, but maybe too many methods

There are several "unofficial" but convenient normalization variants that could be offered, e.g.:
                           
   'string'.normalize :mac  # use MacIntosh file system normalization variant

Implementations are already available in pure Ruby (easy for other Ruby implementations; e.g. eprun: https://github.com/duerst/eprun) and in C (unf,窶ヲ, http://bibwild.wordpress.com/2013/11/19/benchmarking-ruby-unicode-normalization-alternatives/)

---Files--------------------------------
Normalization.pdf (576 KB)


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