/[webpac2]/trunk/lib/WebPAC/Normalize.pm
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revision 74 by dpavlin, Sun Nov 20 20:13:39 2005 UTC revision 261 by dpavlin, Fri Dec 16 16:00:18 2005 UTC
# Line 11  WebPAC::Normalize - data mungling for no Line 11  WebPAC::Normalize - data mungling for no
11    
12  =head1 VERSION  =head1 VERSION
13    
14  Version 0.02  Version 0.06
15    
16  =cut  =cut
17    
18  our $VERSION = '0.02';  our $VERSION = '0.06';
19    
20  =head1 SYNOPSIS  =head1 SYNOPSIS
21    
# Line 47  optional C<filter{filter_name}> at B<beg Line 47  optional C<filter{filter_name}> at B<beg
47  code defined as code ref on format after field substitution to producing  code defined as code ref on format after field substitution to producing
48  output  output
49    
50    There is one built-in filter called C<regex> which can be use like this:
51    
52      filter{regex(s/foo/bar/)}
53    
54  =item *  =item *
55    
56  optional C<lookup{...}> will be then performed. See C<WebPAC::Lookups>.  optional C<lookup{...}> will be then performed. See C<WebPAC::Lookups>.
# Line 82  Create new normalisation object Line 86  Create new normalisation object
86          db => $db_obj,          db => $db_obj,
87          lookup_regex => $lookup->regex,          lookup_regex => $lookup->regex,
88          lookup => $lookup_obj,          lookup => $lookup_obj,
89            prefix => 'foobar',
90    );    );
91    
92  Parametar C<filter> defines user supplied snippets of perl code which can  Parametar C<filter> defines user supplied snippets of perl code which can
93  be use with C<filter{...}> notation.  be use with C<filter{...}> notation.
94    
95    C<prefix> is used to form filename for database record (to support multiple
96    source files which are joined in one database).
97    
98  Recommended parametar C<lookup_regex> is used to enable parsing of lookups  Recommended parametar C<lookup_regex> is used to enable parsing of lookups
99  in structures. If you pass this parametar, you must also pass C<lookup>  in structures. If you pass this parametar, you must also pass C<lookup>
100  which is C<WebPAC::Lookup> object.  which is C<WebPAC::Lookup> object.
# Line 111  sub new { Line 119  sub new {
119    
120          $log->logdie("lookup must be WebPAC::Lookup object") if ($self->{'lookup'} && ! $self->{'lookup'}->isa('WebPAC::Lookup'));          $log->logdie("lookup must be WebPAC::Lookup object") if ($self->{'lookup'} && ! $self->{'lookup'}->isa('WebPAC::Lookup'));
121    
122            $log->warn("no prefix defined. please check that!") unless ($self->{'prefix'});
123    
124            $log->debug("using lookup regex: ", $self->{lookup_regex}) if ($r && $l);
125    
126            if ($self->{filter} && ! $self->{filter}->{regex}) {
127                    $log->debug("adding built-in filter regex");
128                    $self->{filter}->{regex} = sub {
129                            my ($val, $regex) = @_;
130                            eval "\$val =~ $regex";
131                            return $val;
132                    };
133            }
134    
135          $self ? return $self : return undef;          $self ? return $self : return undef;
136  }  }
137    
# Line 124  This structures are used to produce outp Line 145  This structures are used to produce outp
145    
146   my $ds = $webpac->data_structure($rec);   my $ds = $webpac->data_structure($rec);
147    
 B<Note: historical oddity follows>  
   
 This method will also set C<< $webpac->{'currnet_filename'} >> if there is  
 C<< <filename> >> tag and C<< $webpac->{'headline'} >> if there is  
 C<< <headline> >> tag.  
   
148  =cut  =cut
149    
150  sub data_structure {  sub data_structure {
# Line 140  sub data_structure { Line 155  sub data_structure {
155          my $rec = shift;          my $rec = shift;
156          $log->logconfess("need HASH as first argument!") if ($rec !~ /HASH/o);          $log->logconfess("need HASH as first argument!") if ($rec !~ /HASH/o);
157    
158            $log->debug("data_structure rec = ", sub { Dumper($rec) });
159    
160            $log->logdie("need unique ID (mfn) in field 000 of record ", sub { Dumper($rec) } ) unless (defined($rec->{'000'}));
161    
162            my $id = $rec->{'000'}->[0] || $log->logdie("field 000 isn't array!");
163    
164          my $cache_file;          my $cache_file;
165    
166          if ($self->{'db'}) {          if ($self->{'db'}) {
167                  my $ds = $self->{'db'}->load_ds($rec);                  my $ds = $self->{'db'}->load_ds( id => $id, prefix => $self->{prefix} );
168                  $log->debug("load_ds( rec = ", sub { Dumper($rec) }, ") = ", sub { Dumper($ds) });                  $log->debug("load_ds( rec = ", sub { Dumper($rec) }, ") = ", sub { Dumper($ds) });
169                  return $ds if ($ds);                  return $ds if ($ds);
170                  $log->debug("cache miss, creating");                  $log->debug("cache miss, creating");
# Line 195  sub data_structure { Line 216  sub data_structure {
216                                  @v = map { $self->apply_format($tag->{'format_name'},$tag->{'format_delimiter'},$_) } @v;                                  @v = map { $self->apply_format($tag->{'format_name'},$tag->{'format_delimiter'},$_) } @v;
217                          }                          }
218    
                         if ($field eq 'filename') {  
                                 $self->{'current_filename'} = join('',@v);  
                                 $log->debug("filename: ",$self->{'current_filename'});  
                         } elsif ($field eq 'headline') {  
                                 $self->{'headline'} .= join('',@v);  
                                 $log->debug("headline: ",$self->{'headline'});  
                                 next; # don't return headline in data_structure!  
                         }  
   
219                          # delimiter will join repeatable fields                          # delimiter will join repeatable fields
220                          if ($tag->{'delimiter'}) {                          if ($tag->{'delimiter'}) {
221                                  @v = ( join($tag->{'delimiter'}, @v) );                                  @v = ( join($tag->{'delimiter'}, @v) );
# Line 216  sub data_structure { Line 228  sub data_structure {
228    
229                          foreach my $type (@types) {                          foreach my $type (@types) {
230                                  # append to previous line?                                  # append to previous line?
231                                  $log->debug("type: $type ",sub { join(" ",@v) }, $row->{'append'} || 'no append');                                  $log->debug("type: $type ",sub { join(" ",@v) }, " ", $row->{'append'} || 'no append');
232                                  if ($tag->{'append'}) {                                  if ($tag->{'append'}) {
233    
234                                          # I will delimit appended part with                                          # I will delimit appended part with
# Line 257  sub data_structure { Line 269  sub data_structure {
269    
270          }          }
271    
         $log->logdie("there is no current_filename defined! Do you have filename tag in conf/normalize/?.xml") unless ($self->{'current_filename'});  
   
272          $self->{'db'}->save_ds(          $self->{'db'}->save_ds(
273                    id => $id,
274                  ds => $ds,                  ds => $ds,
275                  current_filename => $self->{'current_filename'},                  prefix => $self->{prefix},
                 headline => $self->{'headline'},  
276          ) if ($self->{'db'});          ) if ($self->{'db'});
277    
278          $log->debug("ds: ", sub { Dumper($ds) });          $log->debug("ds: ", sub { Dumper($ds) });
# Line 281  return output or nothing depending on ev Line 291  return output or nothing depending on ev
291    
292   my $text = $webpac->parse($rec,'eval{"v901^a" eq "Deskriptor"}descriptor: v250^a', $i);   my $text = $webpac->parse($rec,'eval{"v901^a" eq "Deskriptor"}descriptor: v250^a', $i);
293    
294    Filters are implemented here. While simple form of filters looks like this:
295    
296      filter{name_of_filter}
297    
298    but, filters can also have variable number of parametars like this:
299    
300      filter{name_of_filter(param,param,param)}
301    
302  =cut  =cut
303    
304    my $warn_once;
305    
306  sub parse {  sub parse {
307          my $self = shift;          my $self = shift;
308    
# Line 352  sub parse { Line 372  sub parse {
372                  return if (! $self->_eval($eval));                  return if (! $self->_eval($eval));
373          }          }
374                    
375          if ($filter_name && $self->{'filter'}->{$filter_name}) {          if ($filter_name) {
376                  $log->debug("about to filter{$filter_name} format: $out");                  my @filter_args;
377                  $out = $self->{'filter'}->{$filter_name}->($out);                  if ($filter_name =~ s/(\w+)\((.*)\)/$1/) {
378                  return unless(defined($out));                          @filter_args = split(/,/, $2);
379                  $log->debug("filter result: $out");                  }
380                    if ($self->{'filter'}->{$filter_name}) {
381                            $log->debug("about to filter{$filter_name} format: $out with arguments: ", join(",", @filter_args));
382                            unshift @filter_args, $out;
383                            $out = $self->{'filter'}->{$filter_name}->(@filter_args);
384                            return unless(defined($out));
385                            $log->debug("filter result: $out");
386                    } elsif (! $warn_once->{$filter_name}) {
387                            $log->warn("trying to use undefined filter $filter_name");
388                            $warn_once->{$filter_name}++;
389                    }
390          }          }
391    
392          return $out;          return $out;
# Line 466  sub fill_in { Line 496  sub fill_in {
496                  # do we have lookups?                  # do we have lookups?
497                  if ($self->{'lookup'}) {                  if ($self->{'lookup'}) {
498                          if ($self->{'lookup'}->can('lookup')) {                          if ($self->{'lookup'}->can('lookup')) {
499                                  return $self->{'lookup'}->lookup($format);                                  my @lookup = $self->{lookup}->lookup($format);
500                                    $log->debug("lookup $format", join(", ", @lookup));
501                                    return @lookup;
502                          } else {                          } else {
503                                  $log->warn("Have lookup object but can't invoke lookup method");                                  $log->warn("Have lookup object but can't invoke lookup method");
504                          }                          }
# Line 680  under the same terms as Perl itself. Line 712  under the same terms as Perl itself.
712    
713  =cut  =cut
714    
715  1; # End of WebPAC::DB  1; # End of WebPAC::Normalize

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