Asp Forum - Non-English characters

Thiago Arrais

2/13/2007 6:01:00 PM

Has anyone seen a non-english characters library for Ruby walking
around? For now, I need to remove letter decorators (in other words,
'ñ' becomes n and 'â' becomes a) and drop non-alphanumeric
characters ('!etter' becomes 'etter').

Those are some pretty simple functions that I could write myself
(actually I already have), but it would be nice to use some better
tested code.

Cheers,

Thiago Arrais
--
Mergulhando no Caos - http://thiagoarrais.wor...
Pensamentos, idéias e devaneios sobre desenvolvimento de software e
tecnologia em geral

4 Answers

Carlos

2/13/2007 6:35:00 PM

Thiago Arrais wrote:
> Has anyone seen a non-english characters library for Ruby walking
> around? For now, I need to remove letter decorators (in other words,
> 'ñ' becomes n and 'â' becomes a) and drop non-alphanumeric
> characters ('!etter' becomes 'etter').
>
> Those are some pretty simple functions that I could write myself
> (actually I already have), but it would be nice to use some better
> tested code.

You could use the "unicode" library, by Yoshida Masato.
http://www.yoshidam.net...

Example:

$ cat uni.rb
require 'unicode'
txt = 'ñ÷åòôùõéïðÁÓÄÆÇÈÊËÌ!@#*$%^&'
puts Unicode.decompose(txt).delete('^0-9A-Za-z')

$ ruby uni.rb
naoouoeiAOACEEEI

Good luck.
--

Xavier Noria

2/13/2007 6:59:00 PM

On Feb 13, 2007, at 7:00 PM, Thiago Arrais wrote:

> Has anyone seen a non-english characters library for Ruby walking
> around? For now, I need to remove letter decorators (in other words,
> 'ñ' becomes n and 'â' becomes a) and drop non-alphanumeric
> characters ('!etter' becomes 'etter').
>
> Those are some pretty simple functions that I could write myself
> (actually I already have), but it would be nice to use some better
> tested code.

The best approach I've seen[*] is to decompose and map to ASCII:

Iconv.iconv('ascii//ignore//translit', 'utf-8', str)

and then sanitize.

I think this is better than the technique that passes through Unicode
decomposition because it also handles ß (ss), € (EUR), æ (ae), œ
(oe), etc.

-- fxn

[*] Seen in the source of the Rails plugin acts_as_friendly_param,
which in turn takes the idea from Mephisto.

Paul Duncan

2/13/2007 7:21:00 PM

* Thiago Arrais (thiago.arrais@gmail.com) wrote:
> Has anyone seen a non-english characters library for Ruby walking
> around? For now, I need to remove letter decorators (in other words,
> 'ñ' becomes n and 'â' becomes a) and drop non-alphanumeric
> characters ('!etter' becomes 'etter').

I thought iconv transliteration might do this, but it doesn't:

require 'iconv'
i = Iconv.new('ascii//TRANSLIT//IGNORE, 'iso-8859-1')
i.iconv('ñ')
=> "?"

A bit of googling turns up the following:

* Text::Unaccent, a Perl module available via CPAN
(http://search.cpan.org/~ldachary/Text-Unaccent-1.08/U...)
* unac, a GNU utility (and library) that removes accents from
characters. (http://home.gna.org/unac/unac-ma...)

Both work roughly the same way; they use iconv to convert the source
string to UTF-16BE, followed by a mapping table to map accented
characters to their non-accented equivalents.

The unac link above has a bit more information about how these mapping
tables are generated; basically they have a script that parses a unicode
data file at build time and generates the mapping table.

The mapping table is available here:
http://www.unicode.org/Public/3.2-Update/UnicodeData...

So anyway, the answers to your question appears to be:

* If you're just converting a couple of characters one time, just
use a regular expression.
* If you're looking to convert an arbitrary number of characters one
time and have access to a machine with GNU tools, just use unac.
* If you're not particular about the language, use the Perl library.
* If you don't mind installing the unac library, I wrote a quick wrapper
for it. See below for more.

This has been discussed on ruby-talk before:

http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-...

I wrote a quick binding for the unac library, you can grab it from here:

http://pablotron.org/files/unac-ruby-0.... (tarball)
http://pablotron.org/files/unac-ruby-0.....asc (PGP Signature)
http://hg.pablotron.org... (Mercurial Repository)

If you're interested, I can probably write a pure-Ruby version
relatively quickly too.

> Those are some pretty simple functions that I could write myself
> (actually I already have), but it would be nice to use some better
> tested code.
>
> Cheers,
>
> Thiago Arrais

--
Paul Duncan <pabs@pablotron.org> pabs in #ruby-lang (OPN IRC)
http://www.pabl... OpenPGP Key ID: 0x82C29562

Xavier Noria

2/13/2007 8:05:00 PM

On Feb 13, 2007, at 8:21 PM, Paul Duncan wrote:

> * Thiago Arrais (thiago.arrais@gmail.com) wrote:
>> Has anyone seen a non-english characters library for Ruby walking
>> around? For now, I need to remove letter decorators (in other words,
>> 'ñ' becomes n and 'â' becomes a) and drop non-alphanumeric
>> characters ('!etter' becomes 'etter').
>
> I thought iconv transliteration might do this, but it doesn't:
>
> require 'iconv'
> i = Iconv.new('ascii//TRANSLIT//IGNORE, 'iso-8859-1')
> i.iconv('ñ')
> => "?"

Looks like your source code was not iso-8859-1, because it works:

require 'iconv'
puts Iconv.iconv('ascii//ignore//translit', 'iso-8859-1', "ñ")
=> ~n

It works in UTF8 as well:

$KCODE = 'u'
require 'iconv'

puts Iconv.iconv('ascii//ignore//translit', 'utf-8', "ñ")
=> ~n

-- fxn

comp.lang.ruby

Non-English characters

Thiago Arrais

Carlos

Xavier Noria

Paul Duncan

Xavier Noria

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