Re: IRI support in URI and URI::Escape modules

On Jan 31, 2005, at 18:19, Martin Duerst wrote:
> I started with some very simple (I thought) tests, but got
> completely confused very quickly. Here is the short program
> that I was using:
>
> >>>> test.pl
> use utf8;
> use URI;
> use URI::Escape;
>
> print (uri_escape("\xFD")
> [snip]
>
> With this, on perl, v5.6.1 built for MSWin32-x86-multi-thread
> (with 1 registered patch, see perl -V for more detail), I get
>
> >>>>
> %FD
> %C3%BD
>
> [snip]
> However, on perl, v5.8.4 built for i386-linux-thread-multi,
> I get:
>
> >>>>
> %FD
> [snip]
> Nothing seems to work anymore, although (or because?) 5.8
> has better Unicode support.

The (easiest|new canonical) way to go is to use uri_escape_utf8() 
instead of uri_escape().  Note that as of version 3.28 
uri_escape_utf8() is NOT AUTOMATICALLY loaded.

% perl -MURI::Escape -le 'print uri_escape("\xFD")'
%FD
% perl -MURI::Escape=uri_escape_utf8 -le 'print uri_escape_utf8("\xFD")'
%C3%BD

perldoc URI::Escape
>        uri_escape_utf8( $string )
>        uri_escape_utf8( $string, $unsafe )
>            Works like uri_escape(), but will encode chars as UTF-8 
> before
>            escaping them.  This makes this function able do deal with 
> charac-
>            ters with code above 255 in $string.  Note that chars in 
> the 128 ..
>            255 range will be escaped differently by this function 
> compared to
>            what uri_escape() would.  For chars in the 0 .. 127 range 
> there is
>            no difference.
>
>            The call:
>
>                $uri = uri_escape_utf8($string);
>
>            will be the same as:
>
>                use Encode qw(encode);
>                $uri = uri_escape(encode("UTF-8", $string));
>
>            but will even work for perl-5.6 for chars in the 128 .. 255 
> range.

Dan the Encode Maintainer