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Diffstat (limited to 'Master/xemtex/perl/lib/utf8.pm')
-rw-r--r-- | Master/xemtex/perl/lib/utf8.pm | 152 |
1 files changed, 0 insertions, 152 deletions
diff --git a/Master/xemtex/perl/lib/utf8.pm b/Master/xemtex/perl/lib/utf8.pm deleted file mode 100644 index 5a37aecba87..00000000000 --- a/Master/xemtex/perl/lib/utf8.pm +++ /dev/null @@ -1,152 +0,0 @@ -package utf8; - -$utf8::hint_bits = 0x00800000; - -our $VERSION = '1.00'; - -sub import { - $^H |= $utf8::hint_bits; - $enc{caller()} = $_[1] if $_[1]; -} - -sub unimport { - $^H &= ~$utf8::hint_bits; -} - -sub AUTOLOAD { - require "utf8_heavy.pl"; - goto &$AUTOLOAD if defined &$AUTOLOAD; - Carp::croak("Undefined subroutine $AUTOLOAD called"); -} - -1; -__END__ - -=head1 NAME - -utf8 - Perl pragma to enable/disable UTF-8 (or UTF-EBCDIC) in source code - -=head1 SYNOPSIS - - use utf8; - no utf8; - -=head1 DESCRIPTION - -The C<use utf8> pragma tells the Perl parser to allow UTF-8 in the -program text in the current lexical scope (allow UTF-EBCDIC on EBCDIC based -platforms). 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. For convenience in what follows the -term I<UTF-X> is used to refer to UTF-8 on ASCII and ISO Latin based -platforms and UTF-EBCDIC on EBCDIC based platforms. - -Enabling the C<utf8> pragma has the following effect: - -=over 4 - -=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 identifier names, string constants, and constant -regular expression patterns. - -On EBCDIC platforms characters in the Latin 1 character set are -treated as being part of a literal UTF-EBCDIC character. - -=back - -Note that if you have bytes with the eighth bit on in your script -(for example embedded Latin-1 in your string literals), C<use utf8> -will be unhappy since the bytes are most probably not well-formed -UTF-8. If you want to have such bytes and use utf8, you can disable -utf8 until the end the block (or file, if at top level) by C<no utf8;>. - -=head2 Utility functions - -The following functions are defined in the C<utf8::> package by the perl core. - -=over 4 - -=item * $num_octets = utf8::upgrade($string); - -Converts (in-place) internal representation of string to Perl's internal -I<UTF-X> form. Returns the number of octets necessary to represent -the string as I<UTF-X>. Can be used to make sure that the -UTF-8 flag is on, so that C<\w> or C<lc()> work as expected on strings -containing characters in the range 0x80-0xFF. Note that this should -not be used to convert -a legacy byte encoding to Unicode: use Encode for that. Affected -by the encoding pragma. - -=item * utf8::downgrade($string[, FAIL_OK]) - -Converts (in-place) internal representation of string to be un-encoded -bytes. Returns true on success. On failure dies or, if the value of -FAIL_OK is true, returns false. Can be used to make sure that the -UTF-8 flag is off, e.g. when you want to make sure that the substr() -or length() function works with the usually faster byte algorithm. -Note that this should not be used to convert Unicode back to a legacy -byte encoding: use Encode for that. B<Not> affected by the encoding -pragma. - -=item * utf8::encode($string) - -Converts (in-place) I<$string> from logical characters to octet -sequence representing it in Perl's I<UTF-X> encoding. Same as -Encode::encode_utf8(). Note that this should not be used to convert -a legacy byte encoding to Unicode: use Encode for that. - -=item * $flag = utf8::decode($string) - -Attempts to convert I<$string> in-place from Perl's I<UTF-X> encoding -into logical characters. Same as Encode::decode_utf8(). Note that this -should not be used to convert Unicode back to a legacy byte encoding: -use Encode for that. - -=item * $flag = utf8::valid(STRING) - -[INTERNAL] Test whether STRING is in a consistent state. Will return -true if string is held as bytes, or is well-formed UTF-8 and has the -UTF-8 flag on. Main reason for this routine is to allow Perl's -testsuite to check that operations have left strings in a consistent -state. - -=back - -C<utf8::encode> is like C<utf8::upgrade>, but the UTF8 flag is -cleared. See L<perlunicode> for more on the UTF8 flag and the C API -functions C<sv_utf8_upgrade>, C<sv_utf8_downgrade>, C<sv_utf8_encode>, -and C<sv_utf8_decode>, which are wrapped by the Perl functions -C<utf8::upgrade>, C<utf8::downgrade>, C<utf8::encode> and -C<utf8::decode>. Note that in the Perl 5.8.0 implementation the -functions utf8::valid, utf8::encode, utf8::decode, utf8::upgrade, -and utf8::downgrade are always available, without a C<require utf8> -statement-- this may change in future releases. - -=head1 BUGS - -One can have Unicode in identifier names, but not in package/class or -subroutine names. While some limited functionality towards this does -exist as of Perl 5.8.0, that is more accidental than designed; use of -Unicode for the said purposes is unsupported. - -One reason of this unfinishedness is its (currently) inherent -unportability: since both package names and subroutine names may need -to be mapped to file and directory names, the Unicode capability of -the filesystem becomes important-- and there unfortunately aren't -portable answers. - -=head1 SEE ALSO - -L<perlunicode>, L<bytes> - -=cut |