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package utf8;
sub import {
$^H |= 0x00800000;
$enc{caller()} = $_[1] if $_[1];
}
sub unimport {
$^H &= ~0x00800000;
}
sub AUTOLOAD {
require "utf8_heavy.pl";
goto &$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.
Expect sudden and unannounced changes!
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<byte>
=cut
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