From: Horacio Sanson <hsanson@...>
Date: 2005-11-05T00:07:41+09:00
Subject: Re: double byte string numbers to_int??


I made some testing and so far no luck getting encoded strings to convert to 
Numeric values.

s = "１７" => "\357\274\221\357\274\227"
puts s => １７
s.to_i =>0

I also tried converting the string with Iconv with no results (Illegal 
Sequence errors).


Playing a little more I got this little method to convert the utf8 encoded 
string to Fixnum

class String
	def w_to_i
	              digits = self.size/3
		res = ""
		0.upto(digits-1) { |d|
			res = res + (self[(d*3)+2] - 144).to_s
		}
		res.to_i
	end
end

# Example usage
s = "０" => "\357\274\220"
s.w_to_i => 0

s = "１" => "\357\274\221"
s.w_to_i => 1

s = "５１" => "\357\274\225\357\274\221"
s.w_to_i => 51
s.w_to_i.class => Fixnum


This little hack works so far but only for my specific application. Any tips 
on making this better are appreciated. Also if there exist any easier way 
(and I believe there must be) I will appreciate any directions.

regards,
Horacio 

Friday 04 November 2005 19:54、Christophe Grandsire さんは書きました:
> Selon Christophe Grandsire <christophe.grandsire@free.fr>:
> > I'm afraid even the parsing capabilities of Date won't solve the problem.
> > It will probably expect digits that are in their ASCII positions rather
> > than Unicode characters that happen to look like numbers to us :) .
>
> I checked around, and my guess is that your original string contains
> "fullwidth ASCII variants". For digits, that's U+FF10 to U+FF19. In UTF-8,
> those are translated into three-byte characters. So your so-called "double
> byte strings" are really six bytes long, and are not treated as containings 
= "１７"
=> "\357\274\221\357\274\227"

> numbers by to_i. --
> Christophe Grandsire.
>
> http://rainbow.conlang.free.fr
>
> It takes a straight mind to create a twisted conlang.