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.IX Title "MIME::WordDecoder 3"
.TH MIME::WordDecoder 3 "2007-09-27" "perl v5.8.8" "User Contributed Perl Documentation"
.SH "NAME"
MIME::WordDecoder \- decode RFC 2047 encoded words to a local representation
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
See MIME::Words for the basics of encoded words.
See \*(L"\s-1DESCRIPTION\s0\*(R" for how this class works.
.PP
.Vb 1
\&    use MIME::WordDecoder;
.Ve
.PP
.Vb 2
\&    ### Get the default word-decoder (used by unmime()):
\&    $wd = default MIME::WordDecoder;
.Ve
.PP
.Vb 2
\&    ### Get a word-decoder which maps to ISO-8859-1 (Latin1):
\&    $wd = supported MIME::WordDecoder "ISO-8859-1";
.Ve
.PP
.Vb 2
\&    ### Decode a MIME string (e.g., into Latin1) via the default decoder:
\&    $str = $wd->decode('To: =?ISO-8859-1?Q?Keld_J=F8rn_Simonsen?= <keld>');
.Ve
.PP
.Vb 2
\&    ### Decode a string using the default decoder, non-OO style:
\&    $str = unmime('To: =?ISO-8859-1?Q?Keld_J=F8rn_Simonsen?= <keld>');
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
A MIME::WordDecoder consists, fundamentally, of a hash which maps
a character set name (\s-1US\-ASCII\s0, \s-1ISO\-8859\-1\s0, etc.) to a subroutine which 
knows how to take bytes in that character set and turn them into 
the target string representation.  Ideally, this target representation 
would be Unicode, but we don't want to overspecify the translation 
that takes place: if you want to convert \s-1MIME\s0 strings directly to Big5, 
that's your own decision.
.PP
The subroutine will be invoked with two arguments: \s-1DATA\s0 (the data in
the given character set), and \s-1CHARSET\s0 (the upcased character set name).
.PP
For example:
.PP
.Vb 6
\&    ### Keep 7-bit characters as-is, convert 8-bit characters to '#':
\&    sub keep7bit {  
\&        local $_ = shift;
\&        tr/\ex00-\ex7F/#/c;
\&        $_;
\&    }
.Ve
.PP
Here's a decoder which uses that:
.PP
.Vb 6
\&   ### Construct a decoder:
\&   $wd = MIME::WordDecoder->new({'US-ASCII'   => "KEEP",   ### sub { $_[0] }
\&                                 'ISO-8859-1' => \e&keep7bit,
\&                                 'ISO-8859-2' => \e&keep7bit,
\&                                 'Big5'       => "WARN",
\&                                 '*'          => "DIE"});
.Ve
.PP
.Vb 2
\&   ### Convert some MIME text to a pure ASCII string...   
\&   $ascii = $wd->decode('To: =?ISO-8859-1?Q?Keld_J=F8rn_Simonsen?= <keld>');
.Ve
.PP
.Vb 1
\&   ### ...which will now hold: "To: Keld J#rn Simonsen <keld>"
.Ve
.SH "PUBLIC INTERFACE"
.IX Header "PUBLIC INTERFACE"
.IP "default [\s-1DECODER\s0]" 4
.IX Item "default [DECODER]"
\&\fIClass method.\fR
Get/set the default \s-1DECODER\s0 object.
.IP "supported \s-1CHARSET\s0, [\s-1DECODER\s0]" 4
.IX Item "supported CHARSET, [DECODER]"
\&\fIClass method.\fR
If just \s-1CHARSET\s0 is given, returns a decoder object which maps
data into that character set (the character set is forced to
all\-uppercase).  
.Sp
.Vb 1
\&    $wd = supported MIME::WordDecoder "ISO-8859-1";
.Ve
.Sp
If \s-1DECODER\s0 is given, installs such an object:
.Sp
.Vb 2
\&    MIME::WordDecoder->supported("ISO-8859-1" => 
\&                                 (new MIME::WordDecoder::ISO_8859 "1"));
.Ve
.Sp
You should not override this method.
.IP "new [\e@HANDLERS]" 4
.IX Item "new [@HANDLERS]"
\&\fIClass method, constructor.\fR
If \e@HANDLERS is given, then \f(CW@HANDLERS\fR is passed to \fIhandler()\fR
to initiallize the internal map.
.IP "handler CHARSET=>\e&SUBREF, ..." 4
.IX Item "handler CHARSET=>&SUBREF, ..."
\&\fIInstance method.\fR
Set the handler \s-1SUBREF\s0 for a given \s-1CHARSET\s0, for as many pairs
as you care to supply.
.Sp
When performing the translation of a MIME-encoded string, a
given \s-1SUBREF\s0 will be invoked when translating a block of text
in character set \s-1CHARSET\s0.  The subroutine will be invoked with 
the following arguments:
.Sp
.Vb 5
\&    DATA    - the data in the given character set.
\&    CHARSET - the upcased character set name, which may prove useful
\&              if you are using the same SUBREF for multiple CHARSETs.
\&    DECODER - the decoder itself, if it contains configuration information
\&              that your handler function needs.
.Ve
.Sp
For example:
.Sp
.Vb 5
\&    $wd = new MIME::WordDecoder;
\&    $wd->handler('US-ASCII'   => "KEEP");
\&    $wd->handler('ISO-8859-1' => \e&handle_latin1,
\&                 'ISO-8859-2' => \e&handle_latin1,
\&                 '*'          => "DIE");
.Ve
.Sp
Notice that, much as with \f(CW%SIG\fR, the \s-1SUBREF\s0 can also be taken from
a set of special keywords:
.Sp
.Vb 4
\&   KEEP     Pass data through unchanged.
\&   IGNORE   Ignore data in this character set, without warning.
\&   WARN     Ignore data in this character set, with warning.
\&   DIE      Fatal exception with "can't handle character set" message.
.Ve
.Sp
The subroutine for the special \s-1CHARSET\s0 of 'raw' is used for raw
(non\-MIME\-encoded) text, which is supposed to be \s-1US\-ASCII\s0.  
The handler for 'raw' defaults to whatever was specified for '\s-1US\-ASCII\s0'
at the time of construction.
.Sp
The subroutine for the special \s-1CHARSET\s0 of '*' is used for any 
unrecognized character set.  The default action for '*' is \s-1WARN\s0.
.IP "decode \s-1STRING\s0" 4
.IX Item "decode STRING"
\&\fIInstance method.\fR
Decode a \s-1STRING\s0 which might contain MIME-encoded components into a
local representation (e.g., \s-1UTF\-8\s0, etc.).
.IP "unmime \s-1STRING\s0" 4
.IX Item "unmime STRING"
\&\fIFunction, exported.\fR
Decode the given \s-1STRING\s0 using the \fIdefault()\fR decoder.
See \fIdefault()\fR.
.SH "SUBCLASSES"
.IX Header "SUBCLASSES"
.IP "MIME::WordDecoder::ISO_8859" 4
.IX Item "MIME::WordDecoder::ISO_8859"
A simple decoder which keeps US-ASCII and the 7\-bit characters
of \s-1ISO\-8859\s0 character sets and \s-1UTF8\s0, and also keeps 8\-bit
characters from the indicated character set.
.Sp
.Vb 2
\&    ### Construct:
\&    $wd = new MIME::WordDecoder::ISO_8859 2;    ### ISO-8859-2
.Ve
.Sp
.Vb 3
\&    ### What to translate unknown characters to (can also use empty):
\&    ### Default is "?".
\&    $wd->unknown("?");
.Ve
.Sp
.Vb 3
\&    ### Collapse runs of unknown characters to a single unknown()?
\&    ### Default is false.
\&    $wd->collapse(1);
.Ve
.Sp
According to \fBhttp://czyborra.com/charsets/iso8859.html\fR 
(ca. November 2000):
.Sp
\&\s-1ISO\s0 8859 is a full series of 10 (and soon even more) standardized
multilingual single-byte coded (8bit) graphic character sets for
writing in alphabetic languages:
.Sp
.Vb 10
\&    1. Latin1 (West European) 
\&    2. Latin2 (East European) 
\&    3. Latin3 (South European) 
\&    4. Latin4 (North European) 
\&    5. Cyrillic 
\&    6. Arabic 
\&    7. Greek 
\&    8. Hebrew 
\&    9. Latin5 (Turkish) 
\&   10. Latin6 (Nordic)
.Ve
.Sp
The \s-1ISO\s0 8859 charsets are not even remotely as complete as the truly
great Unicode but they have been around and usable for quite a while
(first registered Internet charsets for use with \s-1MIME\s0) and have
already offered a major improvement over the plain 7bit \s-1US\-ASCII\s0.
.Sp
Characters 0 to 127 are always identical with US-ASCII and the
positions 128 to 159 hold some less used control characters: the
so-called C1 set from \s-1ISO\s0 6429.
.IP "MIME::WordDecoder::US_ASCII" 4
.IX Item "MIME::WordDecoder::US_ASCII"
A subclass of the \s-1ISO\-8859\-1\s0 decoder which discards 8\-bit characters.  
You're probably better off using \s-1ISO\-8859\-1\s0.
.SH "AUTHOR"
.IX Header "AUTHOR"
Eryq (\fIeryq@zeegee.com\fR), ZeeGee Software Inc (\fIhttp://www.zeegee.com\fR).
David F. Skoll (dfs@roaringpenguin.com) http://www.roaringpenguin.com