/[webpac2]/trunk/lib/WebPAC/Normalize.pm
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Annotation of /trunk/lib/WebPAC/Normalize.pm

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Revision 333 - (hide annotations)
Sat Dec 31 13:42:11 2005 UTC (17 years, 1 month ago) by dpavlin
File size: 16778 byte(s)
try to fix infinite loop (not working)

1 dpavlin 10 package WebPAC::Normalize;
2    
3     use warnings;
4     use strict;
5 dpavlin 29 use base 'WebPAC::Common';
6 dpavlin 13 use Data::Dumper;
7 dpavlin 10
8     =head1 NAME
9    
10 dpavlin 15 WebPAC::Normalize - data mungling for normalisation
11 dpavlin 10
12     =head1 VERSION
13    
14 dpavlin 317 Version 0.08
15 dpavlin 10
16     =cut
17    
18 dpavlin 317 our $VERSION = '0.08';
19 dpavlin 10
20     =head1 SYNOPSIS
21    
22 dpavlin 15 This package contains code that mungle data to produce normalized format.
23 dpavlin 10
24 dpavlin 15 It contains several assumptions:
25    
26     =over
27    
28     =item *
29    
30     format of fields is defined using C<v123^a> notation for repeatable fields
31     or C<s123^a> for single (or first) value, where C<123> is field number and
32     C<a> is subfield.
33    
34     =item *
35    
36     source data records (C<$rec>) have unique identifiers in field C<000>
37    
38     =item *
39    
40     optional C<eval{length('v123^a') == 3}> tag at B<beginning of format> will be
41     perl code that is evaluated before producing output (value of field will be
42     interpolated before that)
43    
44     =item *
45    
46     optional C<filter{filter_name}> at B<begining of format> will apply perl
47     code defined as code ref on format after field substitution to producing
48     output
49    
50 dpavlin 260 There is one built-in filter called C<regex> which can be use like this:
51    
52     filter{regex(s/foo/bar/)}
53    
54 dpavlin 15 =item *
55    
56     optional C<lookup{...}> will be then performed. See C<WebPAC::Lookups>.
57    
58     =item *
59    
60     at end, optional C<format>s rules are resolved. Format rules are similar to
61     C<sprintf> and can also contain C<lookup{...}> which is performed after
62     values are inserted in format.
63    
64     =back
65    
66     This also describes order in which transformations are applied (eval,
67     filter, lookup, format) which is important to undestand when deciding how to
68     solve your data mungling and normalisation process.
69    
70    
71    
72    
73 dpavlin 10 =head1 FUNCTIONS
74    
75 dpavlin 13 =head2 new
76 dpavlin 10
77 dpavlin 13 Create new normalisation object
78    
79     my $n = new WebPAC::Normalize::Something(
80 dpavlin 15 filter => {
81     'filter_name_1' => sub {
82     # filter code
83     return length($_);
84     }, ...
85     },
86 dpavlin 29 db => $db_obj,
87 dpavlin 13 lookup_regex => $lookup->regex,
88 dpavlin 31 lookup => $lookup_obj,
89 dpavlin 219 prefix => 'foobar',
90 dpavlin 13 );
91    
92 dpavlin 15 Parametar C<filter> defines user supplied snippets of perl code which can
93     be use with C<filter{...}> notation.
94    
95 dpavlin 219 C<prefix> is used to form filename for database record (to support multiple
96     source files which are joined in one database).
97    
98 dpavlin 13 Recommended parametar C<lookup_regex> is used to enable parsing of lookups
99 dpavlin 31 in structures. If you pass this parametar, you must also pass C<lookup>
100     which is C<WebPAC::Lookup> object.
101 dpavlin 13
102 dpavlin 10 =cut
103    
104 dpavlin 13 sub new {
105     my $class = shift;
106     my $self = {@_};
107     bless($self, $class);
108    
109 dpavlin 31 my $r = $self->{'lookup_regex'} ? 1 : 0;
110     my $l = $self->{'lookup'} ? 1 : 0;
111    
112     my $log = $self->_get_logger();
113    
114     # those two must be in pair
115     if ( ($r & $l) != ($r || $l) ) {
116     my $log = $self->_get_logger();
117     $log->logdie("lookup_regex and lookup must be in pair");
118     }
119    
120     $log->logdie("lookup must be WebPAC::Lookup object") if ($self->{'lookup'} && ! $self->{'lookup'}->isa('WebPAC::Lookup'));
121    
122 dpavlin 219 $log->warn("no prefix defined. please check that!") unless ($self->{'prefix'});
123    
124 dpavlin 252 $log->debug("using lookup regex: ", $self->{lookup_regex}) if ($r && $l);
125    
126 dpavlin 295 if (! $self->{filter} || ! $self->{filter}->{regex}) {
127 dpavlin 260 $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 dpavlin 13 $self ? return $self : return undef;
136 dpavlin 10 }
137    
138 dpavlin 13
139     =head2 data_structure
140    
141     Create in-memory data structure which represents normalized layout from
142     C<conf/normalize/*.xml>.
143    
144     This structures are used to produce output.
145    
146 dpavlin 70 my $ds = $webpac->data_structure($rec);
147 dpavlin 13
148     =cut
149    
150     sub data_structure {
151     my $self = shift;
152    
153     my $log = $self->_get_logger();
154    
155     my $rec = shift;
156     $log->logconfess("need HASH as first argument!") if ($rec !~ /HASH/o);
157    
158 dpavlin 125 $log->debug("data_structure rec = ", sub { Dumper($rec) });
159    
160 dpavlin 312 $log->logdie("need unique ID (mfn) in field 000 of record " . Dumper($rec) ) unless (defined($rec->{'000'}));
161 dpavlin 125
162 dpavlin 219 my $id = $rec->{'000'}->[0] || $log->logdie("field 000 isn't array!");
163 dpavlin 125
164 dpavlin 13 my $cache_file;
165    
166 dpavlin 18 if ($self->{'db'}) {
167 dpavlin 219 my $ds = $self->{'db'}->load_ds( id => $id, prefix => $self->{prefix} );
168 dpavlin 70 $log->debug("load_ds( rec = ", sub { Dumper($rec) }, ") = ", sub { Dumper($ds) });
169     return $ds if ($ds);
170 dpavlin 29 $log->debug("cache miss, creating");
171 dpavlin 13 }
172    
173     my @sorted_tags;
174     if ($self->{tags_by_order}) {
175     @sorted_tags = @{$self->{tags_by_order}};
176     } else {
177     @sorted_tags = sort { $self->_sort_by_order } keys %{$self->{'import_xml'}->{'indexer'}};
178     $self->{tags_by_order} = \@sorted_tags;
179     }
180    
181 dpavlin 70 my $ds;
182 dpavlin 13
183     $log->debug("tags: ",sub { join(", ",@sorted_tags) });
184    
185     foreach my $field (@sorted_tags) {
186    
187     my $row;
188    
189     #print "field $field [",$self->{'tag'},"] = ",Dumper($self->{'import_xml'}->{'indexer'}->{$field}->{$self->{'tag'}});
190    
191     foreach my $tag (@{$self->{'import_xml'}->{'indexer'}->{$field}->{$self->{'tag'}}}) {
192 dpavlin 38 my $format;
193 dpavlin 13
194 dpavlin 38 $log->logdie("expected tag HASH and got $tag") unless (ref($tag) eq 'HASH');
195     $format = $tag->{'value'} || $tag->{'content'};
196    
197 dpavlin 13 $log->debug("format: $format");
198    
199     my @v;
200     if ($self->{'lookup_regex'} && $format =~ $self->{'lookup_regex'}) {
201     @v = $self->fill_in_to_arr($rec,$format);
202     } else {
203     @v = $self->parse_to_arr($rec,$format);
204     }
205     next if (! @v);
206    
207     if ($tag->{'sort'}) {
208     @v = $self->sort_arr(@v);
209     }
210    
211     # use format?
212     if ($tag->{'format_name'}) {
213     @v = map { $self->apply_format($tag->{'format_name'},$tag->{'format_delimiter'},$_) } @v;
214     }
215    
216     # delimiter will join repeatable fields
217     if ($tag->{'delimiter'}) {
218     @v = ( join($tag->{'delimiter'}, @v) );
219     }
220    
221     # default types
222 dpavlin 74 my @types = qw(display search);
223 dpavlin 13 # override by type attribute
224     @types = ( $tag->{'type'} ) if ($tag->{'type'});
225    
226     foreach my $type (@types) {
227     # append to previous line?
228 dpavlin 252 $log->debug("type: $type ",sub { join(" ",@v) }, " ", $row->{'append'} || 'no append');
229 dpavlin 13 if ($tag->{'append'}) {
230    
231     # I will delimit appended part with
232     # delimiter (or ,)
233     my $d = $tag->{'delimiter'};
234     # default delimiter
235     $d ||= " ";
236    
237     my $last = pop @{$row->{$type}};
238     $d = "" if (! $last);
239     $last .= $d . join($d, @v);
240     push @{$row->{$type}}, $last;
241    
242     } else {
243     push @{$row->{$type}}, @v;
244     }
245     }
246    
247    
248     }
249    
250     if ($row) {
251     $row->{'tag'} = $field;
252    
253     # TODO: name_sigular, name_plural
254     my $name = $self->{'import_xml'}->{'indexer'}->{$field}->{'name'};
255 dpavlin 70 my $row_name = $name ? $self->_x($name) : $field;
256 dpavlin 13
257     # post-sort all values in field
258     if ($self->{'import_xml'}->{'indexer'}->{$field}->{'sort'}) {
259     $log->warn("sort at field tag not implemented");
260     }
261    
262 dpavlin 70 $ds->{$row_name} = $row;
263 dpavlin 13
264     $log->debug("row $field: ",sub { Dumper($row) });
265     }
266    
267     }
268    
269 dpavlin 22 $self->{'db'}->save_ds(
270 dpavlin 219 id => $id,
271 dpavlin 70 ds => $ds,
272 dpavlin 219 prefix => $self->{prefix},
273 dpavlin 18 ) if ($self->{'db'});
274 dpavlin 13
275 dpavlin 70 $log->debug("ds: ", sub { Dumper($ds) });
276 dpavlin 29
277 dpavlin 70 $log->logconfess("data structure returned is not array any more!") if wantarray;
278 dpavlin 13
279 dpavlin 70 return $ds;
280    
281 dpavlin 13 }
282    
283     =head2 parse
284    
285     Perform smart parsing of string, skipping delimiters for fields which aren't
286     defined. It can also eval code in format starting with C<eval{...}> and
287     return output or nothing depending on eval code.
288    
289     my $text = $webpac->parse($rec,'eval{"v901^a" eq "Deskriptor"}descriptor: v250^a', $i);
290    
291 dpavlin 260 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 dpavlin 13 =cut
300    
301 dpavlin 261 my $warn_once;
302    
303 dpavlin 13 sub parse {
304     my $self = shift;
305    
306     my ($rec, $format_utf8, $i) = @_;
307    
308     return if (! $format_utf8);
309    
310     my $log = $self->_get_logger();
311    
312     $log->logconfess("need HASH as first argument!") if ($rec !~ /HASH/o);
313    
314     $i = 0 if (! $i);
315    
316     my $format = $self->_x($format_utf8) || $log->logconfess("can't convert '$format_utf8' from UTF-8 to ",$self->{'code_page'});
317    
318     my @out;
319    
320     $log->debug("format: $format");
321    
322     my $eval_code;
323     # remove eval{...} from beginning
324     $eval_code = $1 if ($format =~ s/^eval{([^}]+)}//s);
325    
326     my $filter_name;
327     # remove filter{...} from beginning
328     $filter_name = $1 if ($format =~ s/^filter{([^}]+)}//s);
329    
330 dpavlin 317 # 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 dpavlin 13 my $prefix;
334    
335 dpavlin 317 my $f_step = 1;
336    
337 dpavlin 13 while ($format =~ s/^(.*?)(v|s)(\d+)(?:\^(\w))?//s) {
338    
339     my $del = $1 || '';
340 dpavlin 317 $prefix = $del if ($f_step == 1);
341 dpavlin 13
342     # repeatable index
343     my $r = $i;
344     $r = 0 if (lc("$2") eq 's');
345    
346     my $found = 0;
347     my $tmp = $self->get_data(\$rec,$3,$4,$r,\$found);
348    
349     if ($found) {
350 dpavlin 317 $found_any += $found;
351    
352     # we will skip delimiter before first occurence of field!
353     push @out, $del unless($found_any == 1);
354 dpavlin 13 push @out, $tmp;
355     }
356 dpavlin 317 $f_step++;
357 dpavlin 13 }
358    
359 dpavlin 317 return if (! $found_any);
360 dpavlin 13
361     my $out = join('',@out);
362    
363     if ($out) {
364     # add rest of format (suffix)
365     $out .= $format;
366    
367     # add prefix if not there
368     $out = $prefix . $out if ($out !~ m/^\Q$prefix\E/);
369    
370     $log->debug("result: $out");
371     }
372    
373     if ($eval_code) {
374     my $eval = $self->fill_in($rec,$eval_code,$i) || return;
375     $log->debug("about to eval{$eval} format: $out");
376     return if (! $self->_eval($eval));
377     }
378    
379 dpavlin 260 if ($filter_name) {
380     my @filter_args;
381     if ($filter_name =~ s/(\w+)\((.*)\)/$1/) {
382     @filter_args = split(/,/, $2);
383     }
384     if ($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 dpavlin 261 } elsif (! $warn_once->{$filter_name}) {
391 dpavlin 260 $log->warn("trying to use undefined filter $filter_name");
392 dpavlin 261 $warn_once->{$filter_name}++;
393 dpavlin 260 }
394 dpavlin 13 }
395    
396     return $out;
397     }
398    
399     =head2 parse_to_arr
400    
401     Similar to C<parse>, but returns array of all repeatable fields
402    
403     my @arr = $webpac->parse_to_arr($rec,'v250^a');
404    
405     =cut
406    
407     sub parse_to_arr {
408     my $self = shift;
409    
410     my ($rec, $format_utf8) = @_;
411    
412     my $log = $self->_get_logger();
413    
414     $log->logconfess("need HASH as first argument!") if ($rec !~ /HASH/o);
415     return if (! $format_utf8);
416    
417     my $i = 0;
418     my @arr;
419    
420     while (my $v = $self->parse($rec,$format_utf8,$i++)) {
421     push @arr, $v;
422     }
423    
424     $log->debug("format '$format_utf8' returned ",--$i," elements: ", sub { join(" | ",@arr) }) if (@arr);
425    
426     return @arr;
427     }
428    
429 dpavlin 15
430     =head2 fill_in
431    
432     Workhourse of all: takes record from in-memory structure of database and
433     strings with placeholders and returns string or array of with substituted
434     values from record.
435    
436     my $text = $webpac->fill_in($rec,'v250^a');
437    
438     Optional argument is ordinal number for repeatable fields. By default,
439     it's assume to be first repeatable field (fields are perl array, so first
440     element is 0).
441     Following example will read second value from repeatable field.
442    
443     my $text = $webpac->fill_in($rec,'Title: v250^a',1);
444    
445     This function B<does not> perform parsing of format to inteligenty skip
446     delimiters before fields which aren't used.
447    
448     This method will automatically decode UTF-8 string to local code page
449     if needed.
450    
451     =cut
452    
453     sub fill_in {
454     my $self = shift;
455    
456     my $log = $self->_get_logger();
457    
458     my $rec = shift || $log->logconfess("need data record");
459     my $format = shift || $log->logconfess("need format to parse");
460     # iteration (for repeatable fields)
461     my $i = shift || 0;
462    
463     $log->logdie("infitite loop in format $format") if ($i > ($self->{'max_mfn'} || 9999));
464    
465     # FIXME remove for speedup?
466     $log->logconfess("need HASH as first argument!") if ($rec !~ /HASH/o);
467    
468     if (utf8::is_utf8($format)) {
469     $format = $self->_x($format);
470     }
471    
472     my $found = 0;
473 dpavlin 333 my $just_single = 1;
474 dpavlin 15
475     my $eval_code;
476     # remove eval{...} from beginning
477     $eval_code = $1 if ($format =~ s/^eval{([^}]+)}//s);
478    
479     my $filter_name;
480     # remove filter{...} from beginning
481     $filter_name = $1 if ($format =~ s/^filter{([^}]+)}//s);
482    
483     # do actual replacement of placeholders
484     # repeatable fields
485 dpavlin 333 if ($format =~ s/v(\d+)(?:\^(\w))?/$self->get_data(\$rec,$1,$2,$i,\$found)/ges) {
486     $just_single = 0;
487     }
488    
489 dpavlin 15 # non-repeatable fields
490 dpavlin 333 if ($format =~ s/s(\d+)(?:\^(\w))?/$self->get_data(\$rec,$1,$2,0,\$found)/ges) {
491     return if ($i > 0 && $just_single);
492     }
493 dpavlin 15
494     if ($found) {
495     $log->debug("format: $format");
496     if ($eval_code) {
497     my $eval = $self->fill_in($rec,$eval_code,$i);
498     return if (! $self->_eval($eval));
499     }
500     if ($filter_name && $self->{'filter'}->{$filter_name}) {
501     $log->debug("filter '$filter_name' for $format");
502     $format = $self->{'filter'}->{$filter_name}->($format);
503     return unless(defined($format));
504     $log->debug("filter result: $format");
505     }
506     # do we have lookups?
507     if ($self->{'lookup'}) {
508 dpavlin 31 if ($self->{'lookup'}->can('lookup')) {
509 dpavlin 252 my @lookup = $self->{lookup}->lookup($format);
510 dpavlin 253 $log->debug("lookup $format", join(", ", @lookup));
511 dpavlin 252 return @lookup;
512 dpavlin 31 } else {
513     $log->warn("Have lookup object but can't invoke lookup method");
514     }
515 dpavlin 15 } else {
516     return $format;
517     }
518     } else {
519     return;
520     }
521     }
522    
523    
524 dpavlin 13 =head2 fill_in_to_arr
525    
526     Similar to C<fill_in>, but returns array of all repeatable fields. Usable
527     for fields which have lookups, so they shouldn't be parsed but rather
528     C<fill_id>ed.
529    
530     my @arr = $webpac->fill_in_to_arr($rec,'[v900];;[v250^a]');
531    
532     =cut
533    
534     sub fill_in_to_arr {
535     my $self = shift;
536    
537     my ($rec, $format_utf8) = @_;
538    
539     my $log = $self->_get_logger();
540    
541     $log->logconfess("need HASH as first argument!") if ($rec !~ /HASH/o);
542     return if (! $format_utf8);
543    
544     my $i = 0;
545     my @arr;
546    
547     while (my @v = $self->fill_in($rec,$format_utf8,$i++)) {
548     push @arr, @v;
549     }
550    
551     $log->debug("format '$format_utf8' returned ",--$i," elements: ", sub { join(" | ",@arr) }) if (@arr);
552    
553     return @arr;
554     }
555    
556 dpavlin 15
557     =head2 get_data
558    
559     Returns value from record.
560    
561     my $text = $self->get_data(\$rec,$f,$sf,$i,\$found);
562    
563     Arguments are:
564     record reference C<$rec>,
565     field C<$f>,
566     optional subfiled C<$sf>,
567     index for repeatable values C<$i>.
568    
569     Optinal variable C<$found> will be incremeted if there
570     is field.
571    
572     Returns value or empty string.
573    
574     =cut
575    
576     sub get_data {
577     my $self = shift;
578    
579     my ($rec,$f,$sf,$i,$found) = @_;
580    
581     if ($$rec->{$f}) {
582     return '' if (! $$rec->{$f}->[$i]);
583     no strict 'refs';
584     if ($sf && $$rec->{$f}->[$i]->{$sf}) {
585     $$found++ if (defined($$found));
586     return $$rec->{$f}->[$i]->{$sf};
587 dpavlin 64 } elsif (! $sf && $$rec->{$f}->[$i]) {
588 dpavlin 15 $$found++ if (defined($$found));
589     # it still might have subfield, just
590     # not specified, so we'll dump all
591     if ($$rec->{$f}->[$i] =~ /HASH/o) {
592     my $out;
593     foreach my $k (keys %{$$rec->{$f}->[$i]}) {
594     $out .= $$rec->{$f}->[$i]->{$k}." ";
595     }
596     return $out;
597     } else {
598     return $$rec->{$f}->[$i];
599     }
600 dpavlin 64 } else {
601     return '';
602 dpavlin 15 }
603     } else {
604     return '';
605     }
606     }
607    
608    
609     =head2 apply_format
610    
611     Apply format specified in tag with C<format_name="name"> and
612     C<format_delimiter=";;">.
613    
614     my $text = $webpac->apply_format($format_name,$format_delimiter,$data);
615    
616     Formats can contain C<lookup{...}> if you need them.
617    
618     =cut
619    
620     sub apply_format {
621     my $self = shift;
622    
623     my ($name,$delimiter,$data) = @_;
624    
625     my $log = $self->_get_logger();
626    
627     if (! $self->{'import_xml'}->{'format'}->{$name}) {
628     $log->warn("<format name=\"$name\"> is not defined in ",$self->{'import_xml_file'});
629     return $data;
630     }
631    
632     $log->warn("no delimiter for format $name") if (! $delimiter);
633    
634     my $format = $self->_x($self->{'import_xml'}->{'format'}->{$name}->{'content'}) || $log->logdie("can't find format '$name'");
635    
636     my @data = split(/\Q$delimiter\E/, $data);
637    
638     my $out = sprintf($format, @data);
639     $log->debug("using format $name [$format] on $data to produce: $out");
640    
641     if ($self->{'lookup_regex'} && $out =~ $self->{'lookup_regex'}) {
642 dpavlin 31 return $self->{'lookup'}->lookup($out);
643 dpavlin 15 } else {
644     return $out;
645     }
646    
647     }
648    
649 dpavlin 13 =head2 sort_arr
650    
651     Sort array ignoring case and html in data
652    
653     my @sorted = $webpac->sort_arr(@unsorted);
654    
655     =cut
656    
657     sub sort_arr {
658     my $self = shift;
659    
660     my $log = $self->_get_logger();
661    
662     # FIXME add Schwartzian Transformation?
663    
664     my @sorted = sort {
665     $a =~ s#<[^>]+/*>##;
666     $b =~ s#<[^>]+/*>##;
667     lc($b) cmp lc($a)
668     } @_;
669     $log->debug("sorted values: ",sub { join(", ",@sorted) });
670    
671     return @sorted;
672     }
673    
674    
675 dpavlin 15 =head1 INTERNAL METHODS
676    
677 dpavlin 13 =head2 _sort_by_order
678    
679     Sort xml tags data structure accoding to C<order=""> attribute.
680    
681     =cut
682    
683     sub _sort_by_order {
684     my $self = shift;
685    
686     my $va = $self->{'import_xml'}->{'indexer'}->{$a}->{'order'} ||
687     $self->{'import_xml'}->{'indexer'}->{$a};
688     my $vb = $self->{'import_xml'}->{'indexer'}->{$b}->{'order'} ||
689     $self->{'import_xml'}->{'indexer'}->{$b};
690    
691     return $va <=> $vb;
692     }
693    
694     =head2 _x
695    
696 dpavlin 15 Convert strings from C<conf/normalize/*.xml> encoding into application
697     specific encoding (optinally specified using C<code_page> to C<new>
698     constructor).
699 dpavlin 13
700     my $text = $n->_x('normalize text string');
701    
702     This is a stub so that other modules doesn't have to implement it.
703    
704     =cut
705    
706     sub _x {
707     my $self = shift;
708     return shift;
709     }
710    
711    
712 dpavlin 10 =head1 AUTHOR
713    
714     Dobrica Pavlinusic, C<< <dpavlin@rot13.org> >>
715    
716     =head1 COPYRIGHT & LICENSE
717    
718     Copyright 2005 Dobrica Pavlinusic, All Rights Reserved.
719    
720     This program is free software; you can redistribute it and/or modify it
721     under the same terms as Perl itself.
722    
723     =cut
724    
725 dpavlin 209 1; # End of WebPAC::Normalize

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