/[webpac2]/trunk/lib/WebPAC/Normalize.pm
This is repository of my old source code which isn't updated any more. Go to git.rot13.org for current projects!
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revision 217 by dpavlin, Mon Dec 5 17:47:51 2005 UTC revision 333 by dpavlin, Sat Dec 31 13:42:11 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 0.03  Version 0.08
15    
16  =cut  =cut
17    
18  our $VERSION = '0.03';  our $VERSION = '0.08';
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 136  sub data_structure { Line 157  sub data_structure {
157    
158          $log->debug("data_structure rec = ", sub { Dumper($rec) });          $log->debug("data_structure rec = ", sub { Dumper($rec) });
159    
160          $log->logdie("need unique ID (mfn) in field 000 of record ", sub { Dumper($rec) } ) unless (defined($rec->{'000'}));          $log->logdie("need unique ID (mfn) in field 000 of record " . Dumper($rec) ) unless (defined($rec->{'000'}));
161    
162          my $mfn = $rec->{'000'}->[0] || $log->logdie("field 000 isn't array!");          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( id => $mfn );                  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");
171          }          }
172    
         undef $self->{'currnet_filename'};  
         undef $self->{'headline'};  
   
173          my @sorted_tags;          my @sorted_tags;
174          if ($self->{tags_by_order}) {          if ($self->{tags_by_order}) {
175                  @sorted_tags = @{$self->{tags_by_order}};                  @sorted_tags = @{$self->{tags_by_order}};
# Line 207  sub data_structure { Line 225  sub data_structure {
225    
226                          foreach my $type (@types) {                          foreach my $type (@types) {
227                                  # append to previous line?                                  # append to previous line?
228                                  $log->debug("type: $type ",sub { join(" ",@v) }, $row->{'append'} || 'no append');                                  $log->debug("type: $type ",sub { join(" ",@v) }, " ", $row->{'append'} || 'no append');
229                                  if ($tag->{'append'}) {                                  if ($tag->{'append'}) {
230    
231                                          # I will delimit appended part with                                          # I will delimit appended part with
# Line 249  sub data_structure { Line 267  sub data_structure {
267          }          }
268    
269          $self->{'db'}->save_ds(          $self->{'db'}->save_ds(
270                  id => $mfn,                  id => $id,
271                  ds => $ds,                  ds => $ds,
272                    prefix => $self->{prefix},
273          ) if ($self->{'db'});          ) if ($self->{'db'});
274    
275          $log->debug("ds: ", sub { Dumper($ds) });          $log->debug("ds: ", sub { Dumper($ds) });
# Line 269  return output or nothing depending on ev Line 288  return output or nothing depending on ev
288    
289   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);
290    
291    Filters are implemented here. While simple form of filters looks like this:
292    
293      filter{name_of_filter}
294    
295    but, filters can also have variable number of parametars like this:
296    
297      filter{name_of_filter(param,param,param)}
298    
299  =cut  =cut
300    
301    my $warn_once;
302    
303  sub parse {  sub parse {
304          my $self = shift;          my $self = shift;
305    
# Line 298  sub parse { Line 327  sub parse {
327          # remove filter{...} from beginning          # remove filter{...} from beginning
328          $filter_name = $1 if ($format =~ s/^filter{([^}]+)}//s);          $filter_name = $1 if ($format =~ s/^filter{([^}]+)}//s);
329    
330            # did we found any (att all) field from format in row?
331            my $found_any = 0;
332            # prefix before first field which we preserve it $found_any
333          my $prefix;          my $prefix;
334          my $all_found=0;  
335            my $f_step = 1;
336    
337          while ($format =~ s/^(.*?)(v|s)(\d+)(?:\^(\w))?//s) {          while ($format =~ s/^(.*?)(v|s)(\d+)(?:\^(\w))?//s) {
338    
339                  my $del = $1 || '';                  my $del = $1 || '';
340                  $prefix ||= $del if ($all_found == 0);                  $prefix = $del if ($f_step == 1);
341    
342                  # repeatable index                  # repeatable index
343                  my $r = $i;                  my $r = $i;
# Line 314  sub parse { Line 347  sub parse {
347                  my $tmp = $self->get_data(\$rec,$3,$4,$r,\$found);                  my $tmp = $self->get_data(\$rec,$3,$4,$r,\$found);
348    
349                  if ($found) {                  if ($found) {
350                          push @out, $del;                          $found_any += $found;
351    
352                            # we will skip delimiter before first occurence of field!
353                            push @out, $del unless($found_any == 1);
354                          push @out, $tmp;                          push @out, $tmp;
                         $all_found += $found;  
355                  }                  }
356                    $f_step++;
357          }          }
358    
359          return if (! $all_found);          return if (! $found_any);
360    
361          my $out = join('',@out);          my $out = join('',@out);
362    
# Line 340  sub parse { Line 376  sub parse {
376                  return if (! $self->_eval($eval));                  return if (! $self->_eval($eval));
377          }          }
378                    
379          if ($filter_name && $self->{'filter'}->{$filter_name}) {          if ($filter_name) {
380                  $log->debug("about to filter{$filter_name} format: $out");                  my @filter_args;
381                  $out = $self->{'filter'}->{$filter_name}->($out);                  if ($filter_name =~ s/(\w+)\((.*)\)/$1/) {
382                  return unless(defined($out));                          @filter_args = split(/,/, $2);
383                  $log->debug("filter result: $out");                  }
384                    if ($self->{'filter'}->{$filter_name}) {
385                            $log->debug("about to filter{$filter_name} format: $out with arguments: ", join(",", @filter_args));
386                            unshift @filter_args, $out;
387                            $out = $self->{'filter'}->{$filter_name}->(@filter_args);
388                            return unless(defined($out));
389                            $log->debug("filter result: $out");
390                    } elsif (! $warn_once->{$filter_name}) {
391                            $log->warn("trying to use undefined filter $filter_name");
392                            $warn_once->{$filter_name}++;
393                    }
394          }          }
395    
396          return $out;          return $out;
# Line 424  sub fill_in { Line 470  sub fill_in {
470          }          }
471    
472          my $found = 0;          my $found = 0;
473            my $just_single = 1;
474    
475          my $eval_code;          my $eval_code;
476          # remove eval{...} from beginning          # remove eval{...} from beginning
# Line 435  sub fill_in { Line 482  sub fill_in {
482    
483          # do actual replacement of placeholders          # do actual replacement of placeholders
484          # repeatable fields          # repeatable fields
485          $format =~ s/v(\d+)(?:\^(\w))?/$self->get_data(\$rec,$1,$2,$i,\$found)/ges;          if ($format =~ s/v(\d+)(?:\^(\w))?/$self->get_data(\$rec,$1,$2,$i,\$found)/ges) {
486                    $just_single = 0;
487            }
488            
489          # non-repeatable fields          # non-repeatable fields
490          $format =~ s/s(\d+)(?:\^(\w))?/$self->get_data(\$rec,$1,$2,0,\$found)/ges;          if ($format =~ s/s(\d+)(?:\^(\w))?/$self->get_data(\$rec,$1,$2,0,\$found)/ges) {
491                    return if ($i > 0 && $just_single);
492            }
493    
494          if ($found) {          if ($found) {
495                  $log->debug("format: $format");                  $log->debug("format: $format");
# Line 454  sub fill_in { Line 506  sub fill_in {
506                  # do we have lookups?                  # do we have lookups?
507                  if ($self->{'lookup'}) {                  if ($self->{'lookup'}) {
508                          if ($self->{'lookup'}->can('lookup')) {                          if ($self->{'lookup'}->can('lookup')) {
509                                  return $self->{'lookup'}->lookup($format);                                  my @lookup = $self->{lookup}->lookup($format);
510                                    $log->debug("lookup $format", join(", ", @lookup));
511                                    return @lookup;
512                          } else {                          } else {
513                                  $log->warn("Have lookup object but can't invoke lookup method");                                  $log->warn("Have lookup object but can't invoke lookup method");
514                          }                          }

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