1Encode::Encoder(3) User Contributed Perl Documentation Encode::Encoder(3)
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6 Encode::Encoder -- Object Oriented Encoder
7
9 use Encode::Encoder;
10 # Encode::encode("ISO-8859-1", $data);
11 Encode::Encoder->new($data)->iso_8859_1; # OOP way
12 # shortcut
13 use Encode::Encoder qw(encoder);
14 encoder($data)->iso_8859_1;
15 # you can stack them!
16 encoder($data)->iso_8859_1->base64; # provided base64() is defined
17 # you can use it as a decoder as well
18 encoder($base64)->bytes('base64')->latin1;
19 # stringified
20 print encoder($data)->utf8->latin1; # prints the string in latin1
21 # numified
22 encoder("\x{abcd}\x{ef}g")->utf8 == 6; # true. bytes::length($data)
23
25 Encode::Encoder allows you to use Encode in an object-oriented style.
26 This is not only more intuitive than a functional approach, but also
27 handier when you want to stack encodings. Suppose you want your UTF-8
28 string converted to Latin1 then Base64: you can simply say
29 my $base64 = encoder($utf8)->latin1->base64;
31 instead of
33 my $latin1 = encode("latin1", $utf8);
35 my $base64 = encode_base64($utf8);
36 or the lazier and more convoluted
38 my $base64 = encode_base64(encode("latin1", $utf8));
40
42 Here is how to use this module.
43 • There are at least two instance variables stored in a hash
45 reference, {data} and {encoding}.
46 • When there is no method, it takes the method name as the name of
48 the encoding and encodes the instance data with encoding. If
49 successful, the instance encoding is set accordingly.
50 • You can retrieve the result via ->data but usually you don't have
52 to because the stringify operator ("") is overridden to do exactly
53 that.
54 Predefined Methods
56 This module predefines the methods below:
57 $e = Encode::Encoder->new([$data, $encoding]);
59 returns an encoder object. Its data is initialized with $data if
60 present, and its encoding is set to $encoding if present.
61 When $encoding is omitted, it defaults to utf8 if $data is already
63 in utf8 or "" (empty string) otherwise.
64 encoder()
66 is an alias of Encode::Encoder->new(). This one is exported on
67 demand.
68 $e->data([$data])
70 When $data is present, sets the instance data to $data and returns
71 the object itself. Otherwise, the current instance data is
72 returned.
73 $e->encoding([$encoding])
75 When $encoding is present, sets the instance encoding to $encoding
76 and returns the object itself. Otherwise, the current instance
77 encoding is returned.
78 $e->bytes([$encoding])
80 decodes instance data from $encoding, or the instance encoding if
81 omitted. If the conversion is successful, the instance encoding
82 will be set to "".
83 The name bytes was deliberately picked to avoid namespace tainting
85 -- this module may be used as a base class so method names that
86 appear in Encode::Encoding are avoided.
87 Example: base64 transcoder
89 This module is designed to work with Encode::Encoding. To make the
90 Base64 transcoder example above really work, you could write a module
91 like this:
92 package Encode::Base64;
94 use parent 'Encode::Encoding';
95 __PACKAGE__->Define('base64');
96 use MIME::Base64;
97 sub encode{
98 my ($obj, $data) = @_;
99 return encode_base64($data);
100 }
101 sub decode{
102 my ($obj, $data) = @_;
103 return decode_base64($data);
104 }
105 1;
106 __END__
107 And your caller module would be something like this:
109 use Encode::Encoder;
111 use Encode::Base64;
112 # now you can really do the following
114 encoder($data)->iso_8859_1->base64;
116 encoder($base64)->bytes('base64')->latin1;
117 Operator Overloading
119 This module overloads two operators, stringify ("") and numify (0+).
120 Stringify dumps the data inside the object.
122 Numify returns the number of bytes in the instance data.
124 They come in handy when you want to print or find the size of data.
126
128 Encode, Encode::Encoding
129perl v5.32.1 2021-01-27 Encode::Encoder(3)