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 WARNING: The implementation of Unicode support in Perl is incomplete. See L for the exact details. The C 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 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 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 pragma has the following effects: =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 identifiers, string constants, constant regular expression patterns and package names. On EBCDIC platforms characters in the Latin 1 character set are treated as being part of a literal UTF-EBCDIC character. =item * In the absence of inputs marked as UTF-X, 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-X { use utf8; # force char semantics @chars = split //, $data; # splits characters } =back =head2 Utility functions The following functions are defined in the C package by the perl core. =over 4 =item * $num_octets = utf8::upgrade($string); Converts internal representation of string to the perls internal UTF-X form. Returns the number of octets necessary to represent the string as UTF-X. =item * utf8::downgrade($string[, CHECK]) Converts internal representation of string to be un-encoded bytes. =item * utf8::encode($string) Converts (in-place) I<$string> from logical characters to octet sequence representing it in perl's UTF-X encoding. =item * $flag = utf8::decode($string) Attempts to convert I<$string> in-place from perl's UTF-X encoding into logical characters. =back =head1 SEE ALSO L, L =cut