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