/usr/lib/perl5/Encode/Encoder.pm is in libencode-perl 2.57-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 | #
# $Id: Encoder.pm,v 2.3 2013/09/14 07:51:59 dankogai Exp $
#
package Encode::Encoder;
use strict;
use warnings;
our $VERSION = do { my @r = ( q$Revision: 2.3 $ =~ /\d+/g ); sprintf "%d." . "%02d" x $#r, @r };
require Exporter;
our @ISA = qw(Exporter);
our @EXPORT_OK = qw ( encoder );
our $AUTOLOAD;
use constant DEBUG => !!$ENV{PERL_ENCODE_DEBUG};
use Encode qw(encode decode find_encoding from_to);
use Carp;
sub new {
my ( $class, $data, $encname ) = @_;
unless ($encname) {
$encname = Encode::is_utf8($data) ? 'utf8' : '';
}
else {
my $obj = find_encoding($encname)
or croak __PACKAGE__, ": unknown encoding: $encname";
$encname = $obj->name;
}
my $self = {
data => $data,
encoding => $encname,
};
bless $self => $class;
}
sub encoder { __PACKAGE__->new(@_) }
sub data {
my ( $self, $data ) = @_;
if ( defined $data ) {
$self->{data} = $data;
return $data;
}
else {
return $self->{data};
}
}
sub encoding {
my ( $self, $encname ) = @_;
if ($encname) {
my $obj = find_encoding($encname)
or confess __PACKAGE__, ": unknown encoding: $encname";
$self->{encoding} = $obj->name;
return $self;
}
else {
return $self->{encoding};
}
}
sub bytes {
my ( $self, $encname ) = @_;
$encname ||= $self->{encoding};
my $obj = find_encoding($encname)
or confess __PACKAGE__, ": unknown encoding: $encname";
$self->{data} = $obj->decode( $self->{data}, 1 );
$self->{encoding} = '';
return $self;
}
sub DESTROY { # defined so it won't autoload.
DEBUG and warn shift;
}
sub AUTOLOAD {
my $self = shift;
my $type = ref($self)
or confess "$self is not an object";
my $myname = $AUTOLOAD;
$myname =~ s/.*://; # strip fully-qualified portion
my $obj = find_encoding($myname)
or confess __PACKAGE__, ": unknown encoding: $myname";
DEBUG and warn $self->{encoding}, " => ", $obj->name;
if ( $self->{encoding} ) {
from_to( $self->{data}, $self->{encoding}, $obj->name, 1 );
}
else {
$self->{data} = $obj->encode( $self->{data}, 1 );
}
$self->{encoding} = $obj->name;
return $self;
}
use overload
q("") => sub { $_[0]->{data} },
q(0+) => sub { use bytes(); bytes::length( $_[0]->{data} ) },
fallback => 1,
;
1;
__END__
=head1 NAME
Encode::Encoder -- Object Oriented Encoder
=head1 SYNOPSIS
use Encode::Encoder;
# Encode::encode("ISO-8859-1", $data);
Encode::Encoder->new($data)->iso_8859_1; # OOP way
# shortcut
use Encode::Encoder qw(encoder);
encoder($data)->iso_8859_1;
# you can stack them!
encoder($data)->iso_8859_1->base64; # provided base64() is defined
# you can use it as a decoder as well
encoder($base64)->bytes('base64')->latin1;
# stringified
print encoder($data)->utf8->latin1; # prints the string in latin1
# numified
encoder("\x{abcd}\x{ef}g")->utf8 == 6; # true. bytes::length($data)
=head1 ABSTRACT
B<Encode::Encoder> allows you to use Encode in an object-oriented
style. This is not only more intuitive than a functional approach,
but also handier when you want to stack encodings. Suppose you want
your UTF-8 string converted to Latin1 then Base64: you can simply say
my $base64 = encoder($utf8)->latin1->base64;
instead of
my $latin1 = encode("latin1", $utf8);
my $base64 = encode_base64($utf8);
or the lazier and more convoluted
my $base64 = encode_base64(encode("latin1", $utf8));
=head1 Description
Here is how to use this module.
=over 4
=item *
There are at least two instance variables stored in a hash reference,
{data} and {encoding}.
=item *
When there is no method, it takes the method name as the name of the
encoding and encodes the instance I<data> with I<encoding>. If successful,
the instance I<encoding> is set accordingly.
=item *
You can retrieve the result via -E<gt>data but usually you don't have to
because the stringify operator ("") is overridden to do exactly that.
=back
=head2 Predefined Methods
This module predefines the methods below:
=over 4
=item $e = Encode::Encoder-E<gt>new([$data, $encoding]);
returns an encoder object. Its data is initialized with $data if
present, and its encoding is set to $encoding if present.
When $encoding is omitted, it defaults to utf8 if $data is already in
utf8 or "" (empty string) otherwise.
=item encoder()
is an alias of Encode::Encoder-E<gt>new(). This one is exported on demand.
=item $e-E<gt>data([$data])
When $data is present, sets the instance data to $data and returns the
object itself. Otherwise, the current instance data is returned.
=item $e-E<gt>encoding([$encoding])
When $encoding is present, sets the instance encoding to $encoding and
returns the object itself. Otherwise, the current instance encoding is
returned.
=item $e-E<gt>bytes([$encoding])
decodes instance data from $encoding, or the instance encoding if
omitted. If the conversion is successful, the instance encoding
will be set to "".
The name I<bytes> was deliberately picked to avoid namespace tainting
-- this module may be used as a base class so method names that appear
in Encode::Encoding are avoided.
=back
=head2 Example: base64 transcoder
This module is designed to work with L<Encode::Encoding>.
To make the Base64 transcoder example above really work, you could
write a module like this:
package Encode::Base64;
use parent 'Encode::Encoding';
__PACKAGE__->Define('base64');
use MIME::Base64;
sub encode{
my ($obj, $data) = @_;
return encode_base64($data);
}
sub decode{
my ($obj, $data) = @_;
return decode_base64($data);
}
1;
__END__
And your caller module would be something like this:
use Encode::Encoder;
use Encode::Base64;
# now you can really do the following
encoder($data)->iso_8859_1->base64;
encoder($base64)->bytes('base64')->latin1;
=head2 Operator Overloading
This module overloads two operators, stringify ("") and numify (0+).
Stringify dumps the data inside the object.
Numify returns the number of bytes in the instance data.
They come in handy when you want to print or find the size of data.
=head1 SEE ALSO
L<Encode>,
L<Encode::Encoding>
=cut
|