78 lines
1.8 KiB
Perl
78 lines
1.8 KiB
Perl
package utf8;
|
|
|
|
$utf8::hint_bits = 0x00800000;
|
|
|
|
sub import {
|
|
$^H |= $utf8::hint_bits;
|
|
$enc{caller()} = $_[1] if $_[1];
|
|
}
|
|
|
|
sub unimport {
|
|
$^H &= ~$utf8::hint_bits;
|
|
}
|
|
|
|
sub AUTOLOAD {
|
|
require "utf8_heavy.pl";
|
|
goto &$AUTOLOAD;
|
|
}
|
|
|
|
1;
|
|
__END__
|
|
|
|
=head1 NAME
|
|
|
|
utf8 - Perl pragma to enable/disable UTF-8 in source code
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
use utf8;
|
|
no utf8;
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
WARNING: The implementation of Unicode support in Perl is incomplete.
|
|
See L<perlunicode> for the exact details.
|
|
|
|
The C<use utf8> pragma tells the Perl parser to allow UTF-8 in the
|
|
program text in the current lexical scope. The C<no utf8> pragma
|
|
tells Perl to switch back to treating the source text as literal
|
|
bytes in the current lexical scope.
|
|
|
|
This pragma is primarily a compatibility device. Perl versions
|
|
earlier than 5.6 allowed arbitrary bytes in source code, whereas
|
|
in future we would like to standardize on the UTF-8 encoding for
|
|
source text. Until UTF-8 becomes the default format for source
|
|
text, this pragma should be used to recognize UTF-8 in the source.
|
|
When UTF-8 becomes the standard source format, this pragma will
|
|
effectively become a no-op.
|
|
|
|
Enabling the C<utf8> pragma has the following effects:
|
|
|
|
=over
|
|
|
|
=item *
|
|
|
|
Bytes in the source text that have their high-bit set will be treated
|
|
as being part of a literal UTF-8 character. This includes most literals
|
|
such as identifiers, string constants, constant regular expression patterns
|
|
and package names.
|
|
|
|
=item *
|
|
|
|
In the absence of inputs marked as UTF-8, regular expressions within the
|
|
scope of this pragma will default to using character semantics instead
|
|
of byte semantics.
|
|
|
|
@bytes_or_chars = split //, $data; # may split to bytes if data
|
|
# $data isn't UTF-8
|
|
{
|
|
use utf8; # force char semantics
|
|
@chars = split //, $data; # splits characters
|
|
}
|
|
|
|
=head1 SEE ALSO
|
|
|
|
L<perlunicode>, L<bytes>
|
|
|
|
=cut
|