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revision 1.3 by wakaba, Wed Mar 13 14:47:07 2002 UTC revision 1.14 by wakaba, Wed Apr 3 13:31:36 2002 UTC
# Line 11  Perl module for RFC 822/2822 message C<h Line 11  Perl module for RFC 822/2822 message C<h
11    
12  package Message::Header;  package Message::Header;
13  use strict;  use strict;
14  use vars qw($VERSION %REG %DEFAULT);  use vars qw($VERSION %REG);
15  $VERSION = '1.00';  $VERSION = '1.00';
16    use Carp ();
17  use overload '@{}' => sub {shift->_delete_empty_field()->{field}},  use overload '@{}' => sub {shift->_delete_empty_field()->{field}},
18               '""' => sub {shift->stringify};               '""' => sub {shift->stringify};
19    
# Line 44  when C<stringify>.  (Default = 0) Line 44  when C<stringify>.  (Default = 0)
44    
45  =cut  =cut
46    
47  %DEFAULT = (  my %DEFAULT = (
48    capitalize    => 1,    capitalize    => 1,
49    fold_length   => 70,    fold_length   => 70,
50      #field_type   => {},
51      format        => 'mail-rfc2822',
52    mail_from     => 0,    mail_from     => 0,
53      output_bcc    => 0,
54      parse_all     => 0,
55      sort  => 'none',
56      translate_underscore  => 1,
57      validate      => 1,
58    );
59    $DEFAULT{field_type} = {
60            ':DEFAULT'      => 'Message::Field::Unstructured',
61            
62            received        => 'Message::Field::Received',
63            'x-received'    => 'Message::Field::Received',
64            
65            'content-type'  => 'Message::Field::ContentType',
66            'content-disposition'   => 'Message::Field::ContentDisposition',
67            link    => 'Message::Field::ValueParams',
68            archive => 'Message::Field::ValueParams',
69            'x-face-type'   => 'Message::Field::ValueParams',
70            
71            subject => 'Message::Field::Subject',
72            'x-nsubject'    => 'Message::Field::Subject',
73            
74            'list-software' => 'Message::Field::UA',
75            'user-agent'    => 'Message::Field::UA',
76            server  => 'Message::Field::UA',
77            
78            'content-length'        => 'Message::Field::Numval',
79            lines   => 'Message::Field::Numval',
80            'max-forwards'  => 'Message::Field::Numval',
81            'mime-version'  => 'Message::Field::Numval',
82            
83            path    => 'Message::Field::Path',
84    };
85    for (qw(cancel-lock importance   precedence list-id
86      x-face x-mail-count x-msmail-priority x-priority xref))
87      {$DEFAULT{field_type}->{$_} = 'Message::Field::Structured'}
88    for (qw(approved bcc cc delivered-to disposition-notification-to envelope-to
89      errors-to fcc from mail-followup-to mail-followup-cc reply-to resent-bcc
90      resent-cc resent-to resent-from resent-sender return-path
91      return-receipt-to sender to x-approved x-beenthere
92      x-complaints-to x-envelope-from x-envelope-sender
93      x-envelope-to x-ml-address x-ml-command x-ml-to x-nfrom x-nto))
94      {$DEFAULT{field_type}->{$_} = 'Message::Field::Address'}
95    for (qw(date date-received delivery-date expires
96      expire-date nntp-posting-date posted reply-by resent-date x-tcup-date))
97      {$DEFAULT{field_type}->{$_} = 'Message::Field::Date'}
98    for (qw(article-updates client-date content-id in-reply-to message-id
99      references resent-message-id see-also supersedes))
100      {$DEFAULT{field_type}->{$_} = 'Message::Field::MsgID'}
101    for (qw(accept accept-charset accept-encoding accept-language
102      content-language
103      content-transfer-encoding encrypted followup-to keywords
104      list-archive list-digest list-help list-owner
105      list-post list-subscribe list-unsubscribe list-url uri newsgroups
106      x-brother x-daughter x-respect x-moe x-syster x-wife))
107      {$DEFAULT{field_type}->{$_} = 'Message::Field::CSV'}
108    for (qw(content-alias content-base content-location location referer
109      url x-home-page x-http_referer
110      x-info x-pgp-key x-ml-url x-uri x-url x-web))
111      {$DEFAULT{field_type}->{$_} = 'Message::Field::URI'}
112    
113    ## taken from L<HTTP::Header>
114    # "Good Practice" order of HTTP message headers:
115    #    - General-Headers
116    #    - Request-Headers
117    #    - Response-Headers
118    #    - Entity-Headers
119    # (From draft-ietf-http-v11-spec-rev-01, Nov 21, 1997)
120    my @header_order = qw(
121      mail-from x-envelope-from relay-version path status
122    
123       cache-control connection date pragma transfer-encoding upgrade trailer via
124    
125       accept accept-charset accept-encoding accept-language
126       authorization expect from host
127       if-modified-since if-match if-none-match if-range if-unmodified-since
128       max-forwards proxy-authorization range referer te user-agent
129    
130       accept-ranges age location proxy-authenticate retry-after server vary
131       warning www-authenticate
132    
133       mime-version
134       allow content-base content-encoding content-language content-length
135       content-location content-md5 content-range content-type
136       etag expires last-modified content-style-type content-script-type
137       link
138    
139      xref
140  );  );
141    my %header_order;
142    
143    sub _init ($;%) {
144      my $self = shift;
145      my %options = @_;
146      $self->{field} = [];
147      $self->{option} = \%DEFAULT;
148      my @new_fields = ();
149      for my $name (keys %options) {
150        if (substr ($name, 0, 1) eq '-') {
151          $self->{option}->{substr ($name, 1)} = $options{$name};
152        } else {
153          push @new_fields, ($name => $options{$name});
154        }
155      }
156      $self->add (@new_fields, -parse => $self->{option}->{parse_all})
157        if $#new_fields > -1;
158      
159      my $format = $self->{option}->{format};
160      if ($format =~ /^cgi/) {
161        unshift @header_order, qw(content-type location);
162        $self->{option}->{sort} = 'good-practice';
163      } elsif ($format =~ /^http/) {
164        $self->{option}->{sort} = 'good-practice';
165      }
166      
167      # Make alternative representations of @header_order.  This is used
168      # for sorting.
169      my $i = 1;
170      for (@header_order) {
171          $header_order{$_} = $i++ unless $header_order{$_};
172      }
173    }
174    
175    =head2 Message::Header->new ([%initial-fields/options])
176    
177  =head2 Message::Header->new ([%option])  Constructs a new C<Message::Headers> object.  You might pass some initial
178    C<field-name>-C<field-body> pairs and/or options as parameters to the constructor.
179    
180  Returns new Message::Header instance.  Some options can be  =head3 example
181  specified as hash.  
182     $hdr = new Message::Headers
183            Date         => 'Thu, 03 Feb 1994 00:00:00 +0000',
184            Content_Type => 'text/html',
185            Content_Location => 'http://www.foo.example/',
186            -format => 'mail-rfc2822'       ## not to be header field
187            ;
188    
189  =cut  =cut
190    
191  sub new ($;%) {  sub new ($;%) {
192    my $class = shift;    my $class = shift;
193    my $self = bless {option => {@_}}, $class;    my $self = bless {}, $class;
194    for (keys %DEFAULT) {$self->{option}->{$_} ||= $DEFAULT{$_}}    $self->_init (@_);
195    $self;    $self;
196  }  }
197    
198  =head2 Message::Header->parse ($header, [%option])  =head2 Message::Header->parse ($header, [%initial-fields/options])
199    
200  Parses given C<header> and return a new Message::Header  Parses given C<header> and constructs a new C<Message::Headers>
201  object.  Some options can be specified as hash.  object.  You might pass some additional C<field-name>-C<field-body> pairs
202    or/and initial options as parameters to the constructor.
203    
204  =cut  =cut
205    
206  sub parse ($$;%) {  sub parse ($$;%) {
207    my $class = shift;    my $class = shift;
208    my $header = shift;    my $header = shift;
209    my $self = bless {option => {@_}}, $class;    my $self = bless {}, $class;
210    for (keys %DEFAULT) {$self->{option}->{$_} ||= $DEFAULT{$_}}    $self->_init (@_);
211    $header =~ s/\x0D?\x0A$REG{WSP}+/\x20/gos;    ## unfold    $header =~ s/\x0D?\x0A$REG{WSP}/\x20/gos;     ## unfold
212    for my $field (split /\x0D?\x0A/, $header) {    for my $field (split /\x0D?\x0A/, $header) {
213      if ($field =~ /$REG{M_fromline}/) {      if ($field =~ /$REG{M_fromline}/) {
214        push @{$self->{field}}, {name => 'mail-from', body => $1};        my $body = $1;
215          $body = $self->_field_body ($body, 'mail-from')
216            if $self->{option}->{parse_all};
217          push @{$self->{field}}, {name => 'mail-from', body => $body};
218        } elsif ($field =~ /$REG{M_field}/) {
219          my ($name, $body) = (lc $1, $2);
220          $name =~ s/$REG{WSP}+$//;
221          $body =~ s/$REG{WSP}+$//;
222          $body = $self->_field_body ($body, $name) if $self->{option}->{parse_all};
223          push @{$self->{field}}, {name => $name, body => $body};
224        }
225      }
226      $self;
227    }
228    
229    sub parse_array ($\@;%) {
230      my $class = shift;
231      my $header = shift;
232      Carp::croak "parse_array: first argument is not an array reference"
233        unless ref $header eq 'ARRAY';
234      my $self = bless {}, $class;
235      $self->_init (@_);
236      while (1) {
237        my $field = shift @$header;
238        while (1) {
239          if ($$header[0] =~ /^$REG{WSP}/) {
240            $field .= shift @$header;
241          } else {last}
242        }
243        $field =~ tr/\x0D\x0A//d;   ## BUG: not safe for bar CR/LF
244        if ($field =~ /$REG{M_fromline}/) {
245          my $body = $1;
246          $body = $self->_field_body ($body, 'mail-from')
247            if $self->{option}->{parse_all};
248          push @{$self->{field}}, {name => 'mail-from', body => $body};
249      } elsif ($field =~ /$REG{M_field}/) {      } elsif ($field =~ /$REG{M_field}/) {
250        my ($name, $body) = ($1, $2);        my ($name, $body) = (lc $1, $2);
251        $name =~ s/$REG{WSP}+$//;        $name =~ s/$REG{WSP}+$//;
252        $body =~ s/$REG{WSP}+$//;        $body =~ s/$REG{WSP}+$//;
253        push @{$self->{field}}, {name => lc $name, body => $body};        $body = $self->_field_body ($body, $name) if $self->{option}->{parse_all};
254          push @{$self->{field}}, {name => $name, body => $body};
255      }      }
256        last if $#$header < 0;
257    }    }
258    $self;    $self;
259  }  }
# Line 106  sub field ($$) { Line 274  sub field ($$) {
274    for my $field (@{$self->{field}}) {    for my $field (@{$self->{field}}) {
275      if ($field->{name} eq $name) {      if ($field->{name} eq $name) {
276        unless (wantarray) {        unless (wantarray) {
277            $field->{body} = $self->_field_body ($field->{body}, $name);
278          return $field->{body};          return $field->{body};
279        } else {        } else {
280            $field->{body} = $self->_field_body ($field->{body}, $name);
281          push @ret, $field->{body};          push @ret, $field->{body};
282        }        }
283      }      }
284    }    }
285      if ($#ret < 0) {
286        return $self->add ($name);
287      }
288    @ret;    @ret;
289  }  }
290    
291    sub field_exist ($$) {
292      my $self = shift;
293      my $name = lc shift;
294      my @ret;
295      for my $field (@{$self->{field}}) {
296        return 1 if ($field->{name} eq $name);
297      }
298      0;
299    }
300    
301  =head2 $self->field_name ($index)  =head2 $self->field_name ($index)
302    
303  Returns C<field-name> of $index'th C<field>.  Returns C<field-name> of $index'th C<field>.
# Line 131  sub field_name ($$) { Line 314  sub field_name ($$) {
314  }  }
315  sub field_body ($$) {  sub field_body ($$) {
316    my $self = shift;    my $self = shift;
317    $self->{field}->[shift]->{body};    my $i = shift;
318      $self->{field}->[$i]->{body}
319       = $self->_field_body ($self->{field}->[$i]->{body}, $self->{field}->[$i]->{name});
320      $self->{field}->[$i]->{body};
321    }
322    
323    sub _field_body ($$$) {
324      my $self = shift;
325      my ($body, $name) = @_;
326      unless (ref $body) {
327        my $type = $self->{option}->{field_type}->{$name}
328                || $self->{option}->{field_type}->{':DEFAULT'};
329        eval "require $type" or Carp::croak ("_field_body: $type: $@");
330        unless ($body) {
331          $body = $type->new (-field_name => $name,
332            -format => $self->{option}->{format});
333        } else {
334          $body = $type->parse ($body, -field_name => $name,
335            -format => $self->{option}->{format});
336        }
337      }
338      $body;
339  }  }
340    
341  =head2 $self->field_name_list ()  =head2 $self->field_name_list ()
# Line 148  sub field_name_list ($) { Line 352  sub field_name_list ($) {
352    map {$_->{name}} @{$self->{field}};    map {$_->{name}} @{$self->{field}};
353  }  }
354    
355  =head2 $self->add ($field_name, $field_body)  =head2 $self->add ($field-name, $field-body, [$name, $body, ...])
356    
357  Adds an new C<field>.  It is not checked whether  Adds an new C<field>.  It is not checked whether
358  the field which named $field_body is already exist or not.  the field which named $field_body is already exist or not.
359  If you don't want duplicated C<field>s, use C<replace> method.  If you don't want duplicated C<field>s, use C<replace> method.
360    
361    Instead of field name-body pair, you might pass some options.
362    Four options are available for this method.
363    
364    C<-parse>: Parses and validates C<field-body>, and returns
365    C<field-body> object.  (When multiple C<field-body>s are
366    added, returns only last one.)  (Default: C<defined wantarray>)
367    
368    C<-prepend>: New fields are not appended,
369    but prepended to current fields.  (Default: C<0>)
370    
371    C<-translate-underscore>: Do C<field-name> =~ tr/_/-/.  (Default: C<1>)
372    
373    C<-validate>: Checks whether C<field-name> is valid or not.
374    
375  =cut  =cut
376    
377  sub add ($$$) {  sub add ($%) {
378    my $self = shift;    my $self = shift;
379    my ($name, $body) = (lc shift, shift);    my %fields = @_;
380    return 0 if $name =~ /$REG{UNSAFE_field_name}/;    my %option = %{$self->{option}};
381    push @{$self->{field}}, {name => $name, body => $body};    $option{parse} = defined wantarray unless defined $option{parse};
382    $self;    for (grep {/^-/} keys %fields) {$option{substr ($_, 1)} = $fields{$_}}
383      my $body;
384      for (grep {/^[^-]/} keys %fields) {
385        my $name = lc $_;  $body = $fields{$_};
386        $name =~ tr/_/-/ if $option{translate_underscore};
387        Carp::croak "add: $name: invalid field-name"
388          if $option{validate} && $name =~ /$REG{UNSAFE_field_name}/;
389        $body = $self->_field_body ($body, $name) if $option{parse};
390        if ($option{prepend}) {
391          unshift @{$self->{field}}, {name => $name, body => $body};
392        } else {
393          push @{$self->{field}}, {name => $name, body => $body};
394        }
395      }
396      $body if $option{parse};
397  }  }
398    
399  =head2 $self->relace ($field_name, $field_body)  =head2 $self->relace ($field_name, $field_body)
# Line 174  first one is used and the others are not Line 406  first one is used and the others are not
406    
407  =cut  =cut
408    
409  sub replace ($$$) {  sub replace ($%) {
410    my $self = shift;    my $self = shift;
411    my ($name, $body) = (lc shift, shift);    my %params = @_;
412    return 0 if $name =~ /$REG{UNSAFE_field_name}/;    my %option = %{$self->{option}};
413      $option{parse} = defined wantarray unless defined $option{parse};
414      for (grep {/^-/} keys %params) {$option{substr ($_, 1)} = $params{$_}}
415      my (%new_field, $body);
416      for (grep {/^[^-]/} keys %params) {
417        my $name = lc $_;
418        $name =~ tr/_/-/ if $option{translate_underscore};
419        Carp::croak "replace: $name: invalid field-name"
420          if $option{validate} && $name =~ /$REG{UNSAFE_field_name}/;
421        $params{$_} = $self->_field_body ($params{$_}, $name) if $option{parse};
422        $new_field{$name} = $params{$_};
423      }
424    for my $field (@{$self->{field}}) {    for my $field (@{$self->{field}}) {
425      if ($field->{name} eq $name) {      if (defined $new_field{$field->{name}}) {
426          $body = $new_field {$field->{name}};
427        $field->{body} = $body;        $field->{body} = $body;
428        return $self;        $new_field{$field->{name}} = undef;
429      }      }
430    }    }
431    push @{$self->{field}}, {name => $name, body => $body};    for (keys %new_field) {
432    $self;      push @{$self->{field}}, {name => $_, body => $new_field{$_}};
433      }
434      $body if $option{parse};
435  }  }
436    
437  =head2 $self->delete ($field_name, [$index])  =head2 $self->delete ($field-name, [$name, ...])
438    
439  Deletes C<field> named as $field_name.  Deletes C<field> named as $field_name.
 If $index is specified, only $index'th C<field> is deleted.  
 If not, ($index == 0), all C<field>s that have the C<field-name>  
 $field_name are deleted.  
440    
441  =cut  =cut
442    
443  sub delete ($$;$) {  sub delete ($@) {
444    my $self = shift;    my $self = shift;
445    my ($name, $index) = (lc shift, shift);    my %delete;
446    my $i = 0;    for (@_) {$delete{lc $_} = 1}
447    for my $field (@{$self->{field}}) {    for my $field (@{$self->{field}}) {
448      if ($field->{name} eq $name) {      undef $field if $delete{$field->{name}};
       $i++;  
       if ($index == 0 || $i == $index) {  
         undef $field;  
         return $self if $i == $index;  
       }  
     }  
449    }    }
   $self;  
450  }  }
451    
452  =head2 $self->count ([$field_name])  =head2 $self->count ([$field_name])
# Line 237  sub count ($;$) { Line 473  sub count ($;$) {
473    $count;    $count;
474  }  }
475    
476    =head2 $self->rename ($field-name, $new-name, [$old, $new,...])
477    
478    Renames C<$field-name> as C<$new-name>.
479    
480    =cut
481    
482    sub rename ($%) {
483      my $self = shift;
484      my %params = @_;
485      my %option = %{$self->{option}};
486      for (grep {/^-/} keys %params) {$option{substr ($_, 1)} = $params{$_}}
487      my %new_name;
488      for (grep {/^[^-]/} keys %params) {
489        my ($old => $new) = (lc $_ => lc $params{$_});
490        $new =~ tr/_/-/ if $option{translate_underscore};
491        Carp::croak "rename: $new: invalid field-name"
492          if $option{validate} && $new =~ /$REG{UNSAFE_field_name}/;
493        $new_name{$old} = $new;
494      }
495      for my $field (@{$self->{field}}) {
496        if (length $new_name{$field->{name}}) {
497          $field->{name} = $new_name{$field->{name}};
498        }
499      }
500      $self if defined wantarray;
501    }
502    
503    
504    =item $self->scan(\&doit)
505    
506    Apply a subroutine to each header field in turn.  The callback routine is
507    called with two parameters; the name of the field and a single value.
508    If the header has more than one value, then the routine is called once
509    for each value.
510    
511    =cut
512    
513    sub scan ($&) {
514      my ($self, $sub) = @_;
515      my $sort;
516      $sort = \&_header_cmp if $self->{option}->{sort} eq 'good-practice';
517      $sort = {$a cmp $b} if $self->{option}->{sort} eq 'alphabetic';
518      my @field = @{$self->{field}};
519      if (ref $sort) {
520        @field = sort $sort @{$self->{field}};
521      }
522      for my $field (@field) {
523        next if $field->{name} =~ /^_/;
524        &$sub($field->{name} => $field->{body});
525      }
526    }
527    
528    # Compare function which makes it easy to sort headers in the
529    # recommended "Good Practice" order.
530    ## taken from HTTP::Header
531    sub _header_cmp
532    {
533      my ($na, $nb) = ($a->{name}, $b->{name});
534        # Unknown headers are assign a large value so that they are
535        # sorted last.  This also helps avoiding a warning from -w
536        # about comparing undefined values.
537        $header_order{$na} = 999 unless defined $header_order{$na};
538        $header_order{$nb} = 999 unless defined $header_order{$nb};
539    
540        $header_order{$na} <=> $header_order{$nb} || $na cmp $nb;
541    }
542    
543  =head2 $self->stringify ([%option])  =head2 $self->stringify ([%option])
544    
545  Returns the C<header> as a string.  Returns the C<header> as a string.
# Line 245  Returns the C<header> as a string. Line 548  Returns the C<header> as a string.
548    
549  sub stringify ($;%) {  sub stringify ($;%) {
550    my $self = shift;    my $self = shift;
551    my %OPT = @_;    my %params = @_;
552      my %option = %{$self->{option}};
553      for (grep {/^-/} keys %params) {$option{substr ($_, 1)} = $params{$_}}
554    my @ret;    my @ret;
555    $OPT{capitalize} ||= $self->{option}->{capitalize};    if ($option{mail_from}) {
556    $OPT{mail_from} ||= $self->{option}->{mail_from};      my $fromline = $self->field ('mail-from');
557    push @ret, 'From '.$self->field ('mail-from') if $OPT{mail_from};      push @ret, 'From '.$fromline if $fromline;
   for my $field (@{$self->{field}}) {  
     my $name = $field->{name};  
     next unless $field->{name};  
     next if !$OPT{mail_from} && $name eq 'mail-from';  
     $name =~ s/((?:^|-)[a-z])/uc($1)/ge if $OPT{capitalize};  
     push @ret, $name.': '.$self->fold ($field->{body});  
558    }    }
559      $self->scan (sub {
560        my ($name, $body) = (@_);
561        return unless length $name;
562        return if $option{mail_from} && $name eq 'mail-from';
563        return if !$option{output_bcc} && ($name eq 'bcc' || $name eq 'resent-bcc');
564        my $fbody;
565        if (ref $body) {
566          $fbody = $body->stringify (-format => $option{format});
567        } else {
568          $fbody = $body;
569        }
570        return unless length $fbody;
571        $fbody =~ s/\x0D(?=[^\x09\x0A\x20])/\x0D\x20/g;
572        $fbody =~ s/\x0A(?=[^\x09\x20])/\x0A\x20/g;
573        $name =~ s/((?:^|-)[a-z])/uc($1)/ge if $option{capitalize};
574        push @ret, $name.': '.$self->fold ($fbody);
575      });
576    my $ret = join ("\n", @ret);    my $ret = join ("\n", @ret);
577    $ret? $ret."\n": "";    $ret? $ret."\n": '';
578  }  }
579    *as_string = \&stringify;
580    
581  =head2 $self->get_option ($option_name)  =head2 $self->option ($option_name, [$option_value])
582    
583  Returns value of the option.  Set/gets new value of the option.
   
 =head2 $self->set_option ($option_name, $option_value)  
   
 Set new value of the option.  
584    
585  =cut  =cut
586    
587  sub get_option ($$) {  sub option ($@) {
588    my $self = shift;    my $self = shift;
589    my ($name) = @_;    if (@_ == 1) {
590    $self->{option}->{$name};      return $self->{option}->{ shift (@_) };
591      }
592      while (my ($name, $value) = splice (@_, 0, 2)) {
593        $name =~ s/^-//;
594        $self->{option}->{$name} = $value;
595        if ($name eq 'format') {
596          for my $f (@{$self->{field}}) {
597            if (ref $f->{body}) {
598              $f->{body}->option (-format => $value);
599            }
600          }
601        }
602      }
603  }  }
604  sub set_option ($$$) {  
605    sub field_type ($$;$) {
606    my $self = shift;    my $self = shift;
607    my ($name, $value) = @_;    my $field_name = shift;
608    $self->{option}->{$name} = $value;    my $new_field_type = shift;
609    $self;    if ($new_field_type) {
610        $self->{option}->{field_type}->{$field_name} = $new_field_type;
611      }
612      $self->{option}->{field_type}->{$field_name}
613      || $self->{option}->{field_type}->{':DEFAULT'};
614  }  }
615    
616  sub _delete_empty_field ($) {  sub _delete_empty_field ($) {
# Line 311  sub fold ($$;$) { Line 641  sub fold ($$;$) {
641       # next split a whitespace       # next split a whitespace
642       # else we are looking at a single word and probably don't want to split       # else we are looking at a single word and probably don't want to split
643       my $x = "";       my $x = "";
644       $x .= "$1\n    "       $x .= "$1\n "
645         while($string =~ s/^$REG{WSP}*(         while($string =~ s/^$REG{WSP}*(
646                            [^"]{$min,$max}?[\,\;]                            [^"]{$min,$max}?[\,\;]
647                            |[^"]{1,$max}$REG{WSP}                            |[^"]{1,$max}$REG{WSP}
# Line 327  sub fold ($$;$) { Line 657  sub fold ($$;$) {
657    $string;    $string;
658  }  }
659    
660    =head2 $self->clone ()
661    
662    Returns a copy of Message::Header object.
663    
664    =cut
665    
666    sub clone ($) {
667      my $self = shift;
668      my $clone = new Message::Header;
669      for my $name (%{$self->{option}}) {
670        if (ref $self->{option}->{$name} eq 'HASH') {
671          $clone->{option}->{$name} = {%{$self->{option}->{$name}}};
672        } elsif (ref $self->{option}->{$name} eq 'ARRAY') {
673          $clone->{option}->{$name} = [@{$self->{option}->{$name}}];
674        } else {
675          $clone->{option}->{$name} = $self->{option}->{$name};
676        }
677      }
678      for (@{$self->{field}}) {
679        $clone->add ($_->{name}, scalar $_->{body});
680      }
681      $clone;
682    }
683    
684    =head1 NOTE
685    
686    =head2 C<field-name>
687    
688    The header field name is not case sensitive.  To make the life
689    easier for perl users who wants to avoid quoting before the => operator,
690    you can use '_' as a synonym for '-' in header field names
691    (this behaviour can be suppressed by setting
692    C<translate_underscore> option to C<0> value).
693    
694  =head1 EXAMPLE  =head1 EXAMPLE
695    
696    ## Print field list    ## Print field list
# Line 334  sub fold ($$;$) { Line 698  sub fold ($$;$) {
698    use Message::Header;    use Message::Header;
699    my $header = Message::Header->parse ($header);    my $header = Message::Header->parse ($header);
700        
   ## Next sample is better.  
   #for my $field (@$header) {  
   #  print $field->{name}, "\t=> ", $field->{body}, "\n";  
   #}  
     
701    for my $i (0..$#$header) {    for my $i (0..$#$header) {
702      print $header->field_name ($i), "\t=> ", $header->field_body ($i), "\n";      print $header->field_name ($i), "\t=> ", $header->field_body ($i), "\n";
703    }    }
# Line 361  sub fold ($$;$) { Line 720  sub fold ($$;$) {
720    $header->add ('References' => '<hoge.msgid%foo@foo.example>');    $header->add ('References' => '<hoge.msgid%foo@foo.example>');
721    print $header;    print $header;
722    
723    =head1 ACKNOWLEDGEMENTS
724    
725    Some of codes are taken from other modules such as
726    HTTP::Header, Mail::Header.
727    
728  =head1 LICENSE  =head1 LICENSE
729    
730  Copyright 2002 wakaba E<lt>w@suika.fam.cxE<gt>.  Copyright 2002 wakaba E<lt>w@suika.fam.cxE<gt>.
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