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-rw-r--r--Master/tlpkg/tlperl/lib/bytes.pm88
1 files changed, 0 insertions, 88 deletions
diff --git a/Master/tlpkg/tlperl/lib/bytes.pm b/Master/tlpkg/tlperl/lib/bytes.pm
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--- a/Master/tlpkg/tlperl/lib/bytes.pm
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-package bytes;
-
-our $VERSION = '1.02';
-
-$bytes::hint_bits = 0x00000008;
-
-sub import {
- $^H |= $bytes::hint_bits;
-}
-
-sub unimport {
- $^H &= ~$bytes::hint_bits;
-}
-
-sub AUTOLOAD {
- require "bytes_heavy.pl";
- goto &$AUTOLOAD if defined &$AUTOLOAD;
- require Carp;
- Carp::croak("Undefined subroutine $AUTOLOAD called");
-}
-
-sub length ($);
-sub chr ($);
-sub ord ($);
-sub substr ($$;$$);
-sub index ($$;$);
-sub rindex ($$;$);
-
-1;
-__END__
-
-=head1 NAME
-
-bytes - Perl pragma to force byte semantics rather than character semantics
-
-=head1 SYNOPSIS
-
- use bytes;
- ... chr(...); # or bytes::chr
- ... index(...); # or bytes::index
- ... length(...); # or bytes::length
- ... ord(...); # or bytes::ord
- ... rindex(...); # or bytes::rindex
- ... substr(...); # or bytes::substr
- no bytes;
-
-
-=head1 DESCRIPTION
-
-The C<use bytes> pragma disables character semantics for the rest of the
-lexical scope in which it appears. C<no bytes> can be used to reverse
-the effect of C<use bytes> within the current lexical scope.
-
-Perl normally assumes character semantics in the presence of character
-data (i.e. data that has come from a source that has been marked as
-being of a particular character encoding). When C<use bytes> is in
-effect, the encoding is temporarily ignored, and each string is treated
-as a series of bytes.
-
-As an example, when Perl sees C<$x = chr(400)>, it encodes the character
-in UTF-8 and stores it in $x. Then it is marked as character data, so,
-for instance, C<length $x> returns C<1>. However, in the scope of the
-C<bytes> pragma, $x is treated as a series of bytes - the bytes that make
-up the UTF8 encoding - and C<length $x> returns C<2>:
-
- $x = chr(400);
- print "Length is ", length $x, "\n"; # "Length is 1"
- printf "Contents are %vd\n", $x; # "Contents are 400"
- {
- use bytes; # or "require bytes; bytes::length()"
- print "Length is ", length $x, "\n"; # "Length is 2"
- printf "Contents are %vd\n", $x; # "Contents are 198.144"
- }
-
-chr(), ord(), substr(), index() and rindex() behave similarly.
-
-For more on the implications and differences between character
-semantics and byte semantics, see L<perluniintro> and L<perlunicode>.
-
-=head1 LIMITATIONS
-
-bytes::substr() does not work as an lvalue().
-
-=head1 SEE ALSO
-
-L<perluniintro>, L<perlunicode>, L<utf8>
-
-=cut