Playing with Unicode

Why when I run this one-liner:

perl -e 'print "\x{2660}\n"'

do I see this:

Wide character in print at -e line 1.

I'm assuming that's a warning, since I still get the expected output,
but why am I getting it, when I didn't ask for them?

Is there a better way to drop in a unicode character?

Semi-related question:  Is there a good document I could read somewhere
on the differences for one-liners in Windows?

Thanks.

James

On 3/25/2004 5:42 PM, James Edward Gray II wrote:
> Why when I run this one-liner:
>
> perl -e 'print "\x{2660}\n"'
>
> do I see this:
>
> Wide character in print at -e line 1.
>
> I'm assuming that's a warning, since I still get the expected output,
> but why am I getting it, when I didn't ask for them?
>
> Is there a better way to drop in a unicode character?
>
> Semi-related question:  Is there a good document I could read somewhere
> on the differences for one-liners in Windows?

Hi James,

I'm not really up on unicode, but you might find something in 'perldoc
perluniintro' & 'perldoc perlunicode'.

The only information that I know of about running perl at the
commandline is in 'perldoc perlrun'. Although, I have a vague
recollection of seeing an article with hints and tips for one-liners
somewhere. Maybe a google search will find something.

Regards,
Randy.

James Edward Gray II wrote:

> Why when I run this one-liner:
>
> perl -e 'print "\x{2660}\n"'
>
> do I see this:
>
> Wide character in print at -e line 1.
>
> I'm assuming that's a warning, since I still get the expected output,
> but why am I getting it, when I didn't ask for them?
>

different version seems to behave differently. my v5.6.0 never warn me about
it. my v5.8.2 does emit a warning. you can turn it off by saying:

[panda]# perl -mbytes=no -e 'print "\x{2660}\n"'

there is a long discussion about what Perl should do when it encounters a
byte sequence which is different than the current C local. should it
upgrade to UTF-8 silently? should it warn? if the current C local is not
UTF-8 then what? you can check the p5p list for the discussion.

david
--
s$s*$+/<tgmecJ"ntgR"tgjvqpC"vuwL$;$;=qq$
 \x24\x5f\x3d\x72\x65\x76\x65\x72\x73\x65

 \x24\x5f\x3b\x73\x2f\x2e\x2f\x63\x68\x72

 \x28\x6f\x72\x64\x28\x24\x26\x29\x2d\x32

 \x29\x2f\x67\x65\x3b\x70\x72\x69\x6e\x74

 \x22\x24\x5f\x5c\x6e\x22\x3b\x3b$;eval$;

James Edward Gray II wrote:

> Why when I run this one-liner:
>
> perl -e 'print "\x{2660}\n"'
>
> do I see this:
>
> Wide character in print at -e line 1.

Makes sense.  2660 would overflow a one-byte character.

>
>
> I'm assuming that's a warning, since I still get the expected output,
> but why am I getting it, when I didn't ask for them?
>
> Is there a better way to drop in a unicode character?

I think you need to warn the compiler ahead of time that you are reading or
writig unicode.  It adapts anyway, but it's just reminding you.  You might s
ee
if you can make sense out of
perldoc encoding
perldoc perlunicode
though they are both rather windy and circuituous.

Joseph

On Mar 25, 2004, at 6:54 PM, Randy W. Sims wrote:

> On 3/25/2004 5:42 PM, James Edward Gray II wrote: 
>
> Hi James,
>
> I'm not really up on unicode, but you might find something in 'perldoc
> perluniintro' & 'perldoc perlunicode'.

Thank you, these Documents are great, especially the first one.

If anyone is interested, you silence the warning by setting STDOUT to
Utf-8 output with:

binmode STDOUT, ":utf8";

James