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Groups > comp.lang.forth > #45658

Re: Reverse a string (with xchars)

From Paul Rubin <no.email@nospam.invalid>
Newsgroups comp.lang.forth
Subject Re: Reverse a string (with xchars)
Date 2016-02-21 12:07 -0800
Organization A noiseless patient Spider
Message-ID <874md16d46.fsf@jester.gateway.pace.com> (permalink)
References <2016Feb19.100032@mips.complang.tuwien.ac.at> <f9be8844-ca23-49c8-96e1-efb307d6e831@googlegroups.com> <c984e8ae-513a-441b-9897-8cfd40f36499@googlegroups.com> <d1e1967f-6c07-4d04-867f-45133642a540@googlegroups.com>

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Chris Curl <ccurl609@gmail.com> writes:
> Since each unicode UTF-16 character is 2 bytes instead of 1, why
> wouldn't something like this work?

UTF-16 is a variable length encoding, like UTF-8.  Remember there are
more than a million Unicode code points.  So you can't always specify
one with 2 bytes.  Plus as Anton says, there is the issue of composing
characters:

  https://en.wikipedia.org/wiki/Unicode_normalization

That means certain characters with diacritics have multiple encodings
some of which use more than one code point, and you have to handle
reversing them.

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Thread

Reverse a string (with xchars) anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2016-02-19 09:00 +0000
  Re: Reverse a string (with xchars) mentificium@gmail.com - 2016-02-20 23:44 -0800
  Re: Reverse a string (with xchars) Chris Curl <ccurl609@gmail.com> - 2016-02-21 10:18 -0800
    Re: Reverse a string (with xchars) Chris Curl <ccurl609@gmail.com> - 2016-02-21 10:24 -0800
      Re: Reverse a string (with xchars) Chris Curl <ccurl609@gmail.com> - 2016-02-21 10:35 -0800
        Re: Reverse a string (with xchars) Paul Rubin <no.email@nospam.invalid> - 2016-02-21 12:07 -0800
          Re: Reverse a string (with xchars) Chris Curl <ccurl609@gmail.com> - 2016-02-21 12:40 -0800
            Re: Reverse a string (with xchars) Paul Rubin <no.email@nospam.invalid> - 2016-02-21 12:50 -0800
            Re: Reverse a string (with xchars) Paul Rubin <no.email@nospam.invalid> - 2016-02-21 12:56 -0800
              Re: Reverse a string (with xchars) Chris Curl <ccurl609@gmail.com> - 2016-02-21 14:43 -0800
                Re: Reverse a string (with xchars) Paul Rubin <no.email@nospam.invalid> - 2016-02-21 14:59 -0800
                Re: Reverse a string (with xchars) Chris Curl <ccurl609@gmail.com> - 2016-02-21 16:55 -0800
              Re: Reverse a string (with xchars) Albert van der Horst <albert@spenarnc.xs4all.nl> - 2016-02-22 09:37 +0000

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