


Encode::Encoder(3Perl Programmers Reference GuEncode::Encoder(3p)


NAME
       Encode::Encoder -- Object Oriented Encoder

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)

ABSTRACT
       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));

Description
       Here is how to use this module.

       o   There are at least two instance variables stored in a
           hash reference, {data} and {encoding}.

       o   When there is no method, it takes the method name as
           the name of the encoding and encodes the instance data
           with encoding.  If successful, the instance encoding
           is set accordingly.

       o   You can retrieve the result via ->data but usually you
           don't have to because the stringify operator ("") is
           overridden to do exactly that.

   Predefined Methods
       This module predefines the methods below:



perl v5.10.1                2008-09-29                          1





Encode::Encoder(3Perl Programmers Reference GuEncode::Encoder(3p)


       $e = Encode::Encoder->new([$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.

       encoder()
           is an alias of Encode::Encoder->new().  This one is
           exported on demand.

       $e->data([$data])
           When $data is present, sets the instance data to $data
           and returns the object itself.  Otherwise, the current
           instance data is returned.

       $e->encoding([$encoding])
           When $encoding is present, sets the instance encoding
           to $encoding and returns the object itself.
           Otherwise, the current instance encoding is returned.

       $e->bytes([$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 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.

   Example: base64 transcoder
       This module is designed to work with Encode::Encoding.  To
       make the Base64 transcoder example above really work, you
       could write a module like this:

         package Encode::Base64;
         use base '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:



perl v5.10.1                2008-09-29                          2





Encode::Encoder(3Perl Programmers Reference GuEncode::Encoder(3p)


         use Encode::Encoder;
         use Encode::Base64;

         # now you can really do the following

         encoder($data)->iso_8859_1->base64;
         encoder($base64)->bytes('base64')->latin1;

   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.

SEE ALSO
       Encode, Encode::Encoding




































perl v5.10.1                2008-09-29                          3


