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comp.lang.ruby

Euro currency symbol

david wright

3/31/2009 12:10:00 AM

Hmm, I seem to be having a bit of a time representing the Euro sign in
Ruby.

ruby -v
ruby 1.8.6 (2008-03-03 patchlevel 114) [universal-darwin9.0]
(same results on a linux box, 1.8.5 with Ruby)

symbol: â?¬
Decimal: 8364
hex: 20Ac
html number: €
html name: €
description: euro sign


dwright@[1061]:dwright% perl -C2 -le 'print chr(oct("20254"))'
â?¬

dwright@[1062]:dwright%ruby -le 'puts "20254".oct.chr'
-e:1:in `chr': 8364 out of char range (RangeError)
from -e:1

dwright@[1063]:dwright%irb
>> puts "20254".oct
8364


>> puts "20254".oct.chr
RangeError: 8364 out of char range
from (irb):5:in `chr'
from (irb):5

ruby -e 'puts "20Ac".hex.chr'
-e:1:in `chr': 8364 out of char range (RangeError)
from -e:1


ruby -KU -e 'puts "20Ac".hex.chr'
-e:1:in `chr': 8364 out of char range (RangeError)
from -e:1

ruby -KU -e '$KCODE="u";puts "20Ac".hex.chr'
-e:1:in `chr': 8364 out of char range (RangeError)
from -e:1

ruby -e "puts '20Ac'.hex.chr"
-e:1:in `chr': 8364 out of char range (RangeError)
from -e:1

Here's the pound:

ruby -e 'puts "The pound:\243"'
The pound:£

ruby -e 'puts "243".oct.chr'
£
--
Posted via http://www.ruby-....
4 Answers

7stud --

3/31/2009 2:34:00 AM

0

David Wright wrote:
> Hmm, I seem to be having a bit of a time representing the Euro sign in
> Ruby.
>
> ruby -v
> ruby 1.8.6 (2008-03-03 patchlevel 114) [universal-darwin9.0]
> (same results on a linux box, 1.8.5 with Ruby)
>
> symbol: â?¬
> Decimal: 8364
> hex: 20Ac
> html number: €
> html name: €
> description: euro sign
>
>
> dwright@[1061]:dwright% perl -C2 -le 'print chr(oct("20254"))'
> â?¬
>
> dwright@[1062]:dwright%ruby -le 'puts "20254".oct.chr'
> -e:1:in `chr': 8364 out of char range (RangeError)
> from -e:1
>
> dwright@[1063]:dwright%irb
>>> puts "20254".oct
> 8364
>
>
>>> puts "20254".oct.chr
> RangeError: 8364 out of char range
> from (irb):5:in `chr'
> from (irb):5
>
> ruby -e 'puts "20Ac".hex.chr'
> -e:1:in `chr': 8364 out of char range (RangeError)
> from -e:1
>
>
> ruby -KU -e 'puts "20Ac".hex.chr'
> -e:1:in `chr': 8364 out of char range (RangeError)
> from -e:1
>
> ruby -KU -e '$KCODE="u";puts "20Ac".hex.chr'
> -e:1:in `chr': 8364 out of char range (RangeError)
> from -e:1
>
> ruby -e "puts '20Ac'.hex.chr"
> -e:1:in `chr': 8364 out of char range (RangeError)
> from -e:1
>
> Here's the pound:
>
> ruby -e 'puts "The pound:\243"'
> The pound:£
>
> ruby -e 'puts "243".oct.chr'
> £


dec_num = "20254".oct
puts dec_num

--output:--
8364


$ri chr
------------------------------------------------------------ Integer#chr
int.chr => string
------------------------------------------------------------------------
Returns a string containing the ASCII character represented by the
receiver's value.

65.chr #=> "A"
?a.chr #=> "a"
230.chr #=> "\346"


There is no ascii character with an ascii code equal to 8364. The pound
has been around a long time, and it made it into extended ascii (or
latin-1, which uses 8 bits). The euro is a recent invention, and it's
numerical code is way out in unicode land.

arr = []
arr << dec_num
str = arr.pack("U") #U=UTF-8 => encode unicode 8364 into a UTF-8
character.
puts str

--output:--
â?¬

--
Posted via http://www.ruby-....

7stud --

3/31/2009 3:00:00 AM

0

7stud -- wrote:
>
> $ri chr
> ------------------------------------------------------------ Integer#chr
> int.chr => string
> ------------------------------------------------------------------------
> Returns a string containing the ASCII character represented by the
> receiver's value.
>
> 65.chr #=> "A"
> ?a.chr #=> "a"
> 230.chr #=> "\346"
>
>
> There is no ascii character with an ascii code equal to 8364. The pound
> has been around a long time, and it made it into extended ascii (or
> latin-1, which uses 8 bits).

8 bits can be used to store codes between 0-255.

ascii characters are represented by numerical codes between 0-127, so
the text describing the operation of chr in the docs is wrong.
According to the description, you would expect codes above 127 to
produce errors. But codes between 127-255 do not produce errors. The
last example demonstrates that. The docs should read something like:

Returns a string containing the latin-1 (or ISO-8859-1) character
represented by the receiver's value. Valid character codes are 0-255.


--
Posted via http://www.ruby-....

david wright

3/31/2009 6:00:00 AM

0

7stud -- wrote:
> 7stud -- wrote:
>>
>> $ri chr
>> ------------------------------------------------------------ Integer#chr
>> int.chr => string
>> ------------------------------------------------------------------------
>> Returns a string containing the ASCII character represented by the
>> receiver's value.
>>
>> 65.chr #=> "A"
>> ?a.chr #=> "a"
>> 230.chr #=> "\346"
>>
>>
>> There is no ascii character with an ascii code equal to 8364. The pound
>> has been around a long time, and it made it into extended ascii (or
>> latin-1, which uses 8 bits).
>
> 8 bits can be used to store codes between 0-255.
>
> ascii characters are represented by numerical codes between 0-127, so
> the text describing the operation of chr in the docs is wrong.
> According to the description, you would expect codes above 127 to
> produce errors. But codes between 127-255 do not produce errors. The
> last example demonstrates that. The docs should read something like:
>
> Returns a string containing the latin-1 (or ISO-8859-1) character
> represented by the receiver's value. Valid character codes are 0-255.


Thanks, good stuff. I didn't know about Array#pack

Sure, I'm familiar with character sets, I was assuming the 'same as
Perl' chr functionality, I should have checked the rdoc for chr,...

Perl:
chr Returns the character represented by that NUMBER in the
character set. For example, "chr(65)" is "A" in either
ASCII
or Unicode, and chr(0x263a) is a Unicode smiley face.


Ruby:
int.chr => string
------------------------------------------------------------------------
Returns a string containing the ASCII character represented by the
receiver's value.



--
Posted via http://www.ruby-....

kungfu-free

3/31/2009 4:05:00 PM

0

ruby -e 'puts "\244"'


David Wright a écrit :
> 7stud -- wrote:
>> 7stud -- wrote:
>>> $ri chr
>>> ------------------------------------------------------------ Integer#chr
>>> int.chr => string
>>> ------------------------------------------------------------------------
>>> Returns a string containing the ASCII character represented by the
>>> receiver's value.
>>>
>>> 65.chr #=> "A"
>>> ?a.chr #=> "a"
>>> 230.chr #=> "\346"
>>>
>>>
>>> There is no ascii character with an ascii code equal to 8364. The pound
>>> has been around a long time, and it made it into extended ascii (or
>>> latin-1, which uses 8 bits).
>> 8 bits can be used to store codes between 0-255.
>>
>> ascii characters are represented by numerical codes between 0-127, so
>> the text describing the operation of chr in the docs is wrong.
>> According to the description, you would expect codes above 127 to
>> produce errors. But codes between 127-255 do not produce errors. The
>> last example demonstrates that. The docs should read something like:
>>
>> Returns a string containing the latin-1 (or ISO-8859-1) character
>> represented by the receiver's value. Valid character codes are 0-255.
>
>
> Thanks, good stuff. I didn't know about Array#pack
>
> Sure, I'm familiar with character sets, I was assuming the 'same as
> Perl' chr functionality, I should have checked the rdoc for chr,...
>
> Perl:
> chr Returns the character represented by that NUMBER in the
> character set. For example, "chr(65)" is "A" in either
> ASCII
> or Unicode, and chr(0x263a) is a Unicode smiley face.
>
>
> Ruby:
> int.chr => string
> ------------------------------------------------------------------------
> Returns a string containing the ASCII character represented by the
> receiver's value.
>
irb(main):019:0> str = "\244"
=> "\244"
irb(main):020:0> puts str
?
=> nil