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Diffstat (limited to 'chromium/third_party/cygwin/lib/perl5/5.10/utf8.pm')
| -rw-r--r-- | chromium/third_party/cygwin/lib/perl5/5.10/utf8.pm | 198 |
1 files changed, 0 insertions, 198 deletions
diff --git a/chromium/third_party/cygwin/lib/perl5/5.10/utf8.pm b/chromium/third_party/cygwin/lib/perl5/5.10/utf8.pm deleted file mode 100644 index a985021f32a..00000000000 --- a/chromium/third_party/cygwin/lib/perl5/5.10/utf8.pm +++ /dev/null @@ -1,198 +0,0 @@ -package utf8; - -$utf8::hint_bits = 0x00800000; - -our $VERSION = '1.07'; - -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; - require Carp; - 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; - - # Convert a Perl scalar to/from UTF-8. - $num_octets = utf8::upgrade($string); - $success = utf8::downgrade($string[, FAIL_OK]); - - # Change the native bytes of a Perl scalar to/from UTF-8 bytes. - utf8::encode($string); - utf8::decode($string); - - $flag = utf8::is_utf8(STRING); # since Perl 5.8.1 - $flag = utf8::valid(STRING); - -=head1 DESCRIPTION - -The C<use utf8> pragma tells the Perl parser to allow UTF-8 in the -program text in the current lexical scope (allow UTF-EBCDIC on EBCDIC based -platforms). The C<no utf8> pragma tells Perl to switch back to treating -the source text as literal bytes in the current lexical scope. - -B<Do not use this pragma for anything else than telling Perl that your -script is written in UTF-8.> The utility functions described below are -directly usable without C<use utf8;>. - -Because it is not possible to reliably tell UTF-8 from native 8 bit -encodings, you need either a Byte Order Mark at the beginning of your -source code, or C<use utf8;>, to instruct perl. - -When UTF-8 becomes the standard source format, this pragma will -effectively become a no-op. For convenience in what follows the term -I<UTF-X> is used to refer to UTF-8 on ASCII and ISO Latin based -platforms and UTF-EBCDIC on EBCDIC based platforms. - -See also the effects of the C<-C> switch and its cousin, the -C<$ENV{PERL_UNICODE}>, in L<perlrun>. - -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-X sequence. 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-X. If you want to have such bytes under C<use utf8>, you can disable -this pragma 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. You do not need to say C<use utf8> to use these and in fact -you should not say that unless you really want to have UTF-8 source code. - -=over 4 - -=item * $num_octets = utf8::upgrade($string) - -Converts in-place the internal octet sequence in the native encoding -(Latin-1 or EBCDIC) to the equivalent character sequence in I<UTF-X>. -I<$string> already encoded as characters does no harm. 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 Unicode on strings containing characters in the range 0x80-0xFF -(on ASCII and derivatives). - -B<Note that this function does not handle arbitrary encodings.> -Therefore Encode is recommended for the general purposes; see also -L<Encode>. - -=item * $success = utf8::downgrade($string[, FAIL_OK]) - -Converts in-place the internal octet sequence in I<UTF-X> to the -equivalent octet sequence in the native encoding (Latin-1 or EBCDIC). -I<$string> already encoded as native 8 bit does no harm. Can be used to -make sure that the UTF-8 flag is off, e.g. when you want to make sure -that the substr() or length() function works with the usually faster -byte algorithm. - -Fails if the original I<UTF-X> sequence cannot be represented in the -native 8 bit encoding. On failure dies or, if the value of C<FAIL_OK> is -true, returns false. - -Returns true on success. - -B<Note that this function does not handle arbitrary encodings.> -Therefore Encode is recommended for the general purposes; see also -L<Encode>. - -=item * utf8::encode($string) - -Converts in-place the character sequence to the corresponding octet -sequence in I<UTF-X>. The UTF8 flag is turned off, so that after this -operation, the string is a byte string. Returns nothing. - -B<Note that this function does not handle arbitrary encodings.> -Therefore Encode is recommended for the general purposes; see also -L<Encode>. - -=item * $success = utf8::decode($string) - -Attempts to convert in-place the octet sequence in I<UTF-X> to the -corresponding character sequence. The UTF-8 flag is turned on only if -the source string contains multiple-byte I<UTF-X> characters. If -I<$string> is invalid as I<UTF-X>, returns false; otherwise returns -true. - -B<Note that this function does not handle arbitrary encodings.> -Therefore Encode is recommended for the general purposes; see also -L<Encode>. - -=item * $flag = utf8::is_utf8(STRING) - -(Since Perl 5.8.1) Test whether STRING is in UTF-8 internally. -Functionally the same as Encode::is_utf8(). - -=item * $flag = utf8::valid(STRING) - -[INTERNAL] Test whether STRING is in a consistent state regarding -UTF-8. Will return true is well-formed UTF-8 and has the UTF-8 flag -on B<or> if string is held as bytes (both these states are 'consistent'). -Main reason for this routine is to allow Perl's testsuite to check -that operations have left strings in a consistent state. You most -probably want to use utf8::is_utf8() instead. - -=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>. Also, the functions utf8::is_utf8, utf8::valid, -utf8::encode, utf8::decode, utf8::upgrade, and utf8::downgrade are -actually internal, and thus always available, without a C<require utf8> -statement. - -=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<perlunitut>, L<perluniintro>, L<perlrun>, L<bytes>, L<perlunicode> - -=cut |