MirOS Manual: Encode::Encoder(3p)


ext::Encode::lib:PerloProgramemxetr:s:ERnecfode::lib::Encode::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.

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

     +   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.

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

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ext::Encode::lib:PerloProgramemxetr:s:ERnecfode::lib::Encode::Encoder(3p)

     Predefined Methods

     This module predefines the methods below:

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

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ext::Encode::lib:PerloProgramemxetr:s:ERnecfode::lib::Encode::Encoder(3p)

       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:

       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 num-
     ify (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

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