1 |
package WebPAC::Normalize; |
2 |
|
3 |
use warnings; |
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use strict; |
5 |
use base 'WebPAC::Common'; |
6 |
use Data::Dumper; |
7 |
|
8 |
=head1 NAME |
9 |
|
10 |
WebPAC::Normalize - data mungling for normalisation |
11 |
|
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=head1 VERSION |
13 |
|
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Version 0.03 |
15 |
|
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=cut |
17 |
|
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our $VERSION = '0.03'; |
19 |
|
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=head1 SYNOPSIS |
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|
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This package contains code that mungle data to produce normalized format. |
23 |
|
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It contains several assumptions: |
25 |
|
26 |
=over |
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|
28 |
=item * |
29 |
|
30 |
format of fields is defined using C<v123^a> notation for repeatable fields |
31 |
or C<s123^a> for single (or first) value, where C<123> is field number and |
32 |
C<a> is subfield. |
33 |
|
34 |
=item * |
35 |
|
36 |
source data records (C<$rec>) have unique identifiers in field C<000> |
37 |
|
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=item * |
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|
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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 * |
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|
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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 |
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|
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=item * |
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|
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optional C<lookup{...}> will be then performed. See C<WebPAC::Lookups>. |
53 |
|
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=item * |
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|
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at end, optional C<format>s rules are resolved. Format rules are similar to |
57 |
C<sprintf> and can also contain C<lookup{...}> which is performed after |
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values are inserted in format. |
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|
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=back |
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|
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This also describes order in which transformations are applied (eval, |
63 |
filter, lookup, format) which is important to undestand when deciding how to |
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solve your data mungling and normalisation process. |
65 |
|
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|
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|
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|
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=head1 FUNCTIONS |
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|
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=head2 new |
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|
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Create new normalisation object |
74 |
|
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my $n = new WebPAC::Normalize::Something( |
76 |
filter => { |
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'filter_name_1' => sub { |
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# filter code |
79 |
return length($_); |
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}, ... |
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}, |
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db => $db_obj, |
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lookup_regex => $lookup->regex, |
84 |
lookup => $lookup_obj, |
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); |
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|
87 |
Parametar C<filter> defines user supplied snippets of perl code which can |
88 |
be use with C<filter{...}> notation. |
89 |
|
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Recommended parametar C<lookup_regex> is used to enable parsing of lookups |
91 |
in structures. If you pass this parametar, you must also pass C<lookup> |
92 |
which is C<WebPAC::Lookup> object. |
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|
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=cut |
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|
96 |
sub new { |
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my $class = shift; |
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my $self = {@_}; |
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bless($self, $class); |
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|
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my $r = $self->{'lookup_regex'} ? 1 : 0; |
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my $l = $self->{'lookup'} ? 1 : 0; |
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|
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my $log = $self->_get_logger(); |
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|
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# those two must be in pair |
107 |
if ( ($r & $l) != ($r || $l) ) { |
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my $log = $self->_get_logger(); |
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$log->logdie("lookup_regex and lookup must be in pair"); |
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} |
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|
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$log->logdie("lookup must be WebPAC::Lookup object") if ($self->{'lookup'} && ! $self->{'lookup'}->isa('WebPAC::Lookup')); |
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|
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$self ? return $self : return undef; |
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} |
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|
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|
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=head2 data_structure |
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|
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Create in-memory data structure which represents normalized layout from |
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C<conf/normalize/*.xml>. |
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|
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This structures are used to produce output. |
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|
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my $ds = $webpac->data_structure($rec); |
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|
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=cut |
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|
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sub data_structure { |
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my $self = shift; |
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|
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my $log = $self->_get_logger(); |
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|
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my $rec = shift; |
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$log->logconfess("need HASH as first argument!") if ($rec !~ /HASH/o); |
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|
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$log->debug("data_structure rec = ", sub { Dumper($rec) }); |
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|
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$log->logdie("need unique ID (mfn) in field 000 of record ", sub { Dumper($rec) } ) unless (defined($rec->{'000'})); |
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|
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my $mfn = $rec->{'000'}->[0] || $log->logdie("field 000 isn't array!"); |
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|
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my $cache_file; |
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|
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if ($self->{'db'}) { |
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my $ds = $self->{'db'}->load_ds( id => $mfn ); |
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$log->debug("load_ds( rec = ", sub { Dumper($rec) }, ") = ", sub { Dumper($ds) }); |
148 |
return $ds if ($ds); |
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$log->debug("cache miss, creating"); |
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} |
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|
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undef $self->{'currnet_filename'}; |
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undef $self->{'headline'}; |
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|
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my @sorted_tags; |
156 |
if ($self->{tags_by_order}) { |
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@sorted_tags = @{$self->{tags_by_order}}; |
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} else { |
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@sorted_tags = sort { $self->_sort_by_order } keys %{$self->{'import_xml'}->{'indexer'}}; |
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$self->{tags_by_order} = \@sorted_tags; |
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} |
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|
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my $ds; |
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|
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$log->debug("tags: ",sub { join(", ",@sorted_tags) }); |
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|
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foreach my $field (@sorted_tags) { |
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|
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my $row; |
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|
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#print "field $field [",$self->{'tag'},"] = ",Dumper($self->{'import_xml'}->{'indexer'}->{$field}->{$self->{'tag'}}); |
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|
173 |
foreach my $tag (@{$self->{'import_xml'}->{'indexer'}->{$field}->{$self->{'tag'}}}) { |
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my $format; |
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|
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$log->logdie("expected tag HASH and got $tag") unless (ref($tag) eq 'HASH'); |
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$format = $tag->{'value'} || $tag->{'content'}; |
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|
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$log->debug("format: $format"); |
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|
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my @v; |
182 |
if ($self->{'lookup_regex'} && $format =~ $self->{'lookup_regex'}) { |
183 |
@v = $self->fill_in_to_arr($rec,$format); |
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} else { |
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@v = $self->parse_to_arr($rec,$format); |
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} |
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next if (! @v); |
188 |
|
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if ($tag->{'sort'}) { |
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@v = $self->sort_arr(@v); |
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} |
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|
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# use format? |
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if ($tag->{'format_name'}) { |
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@v = map { $self->apply_format($tag->{'format_name'},$tag->{'format_delimiter'},$_) } @v; |
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} |
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|
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# delimiter will join repeatable fields |
199 |
if ($tag->{'delimiter'}) { |
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@v = ( join($tag->{'delimiter'}, @v) ); |
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} |
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|
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# default types |
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my @types = qw(display search); |
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# override by type attribute |
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@types = ( $tag->{'type'} ) if ($tag->{'type'}); |
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|
208 |
foreach my $type (@types) { |
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# append to previous line? |
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$log->debug("type: $type ",sub { join(" ",@v) }, $row->{'append'} || 'no append'); |
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if ($tag->{'append'}) { |
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|
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# I will delimit appended part with |
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# delimiter (or ,) |
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my $d = $tag->{'delimiter'}; |
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# default delimiter |
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$d ||= " "; |
218 |
|
219 |
my $last = pop @{$row->{$type}}; |
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$d = "" if (! $last); |
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$last .= $d . join($d, @v); |
222 |
push @{$row->{$type}}, $last; |
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|
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} else { |
225 |
push @{$row->{$type}}, @v; |
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} |
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} |
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|
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|
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} |
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|
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if ($row) { |
233 |
$row->{'tag'} = $field; |
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|
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# TODO: name_sigular, name_plural |
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my $name = $self->{'import_xml'}->{'indexer'}->{$field}->{'name'}; |
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my $row_name = $name ? $self->_x($name) : $field; |
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|
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# post-sort all values in field |
240 |
if ($self->{'import_xml'}->{'indexer'}->{$field}->{'sort'}) { |
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$log->warn("sort at field tag not implemented"); |
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} |
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|
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$ds->{$row_name} = $row; |
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|
246 |
$log->debug("row $field: ",sub { Dumper($row) }); |
247 |
} |
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|
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} |
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|
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$self->{'db'}->save_ds( |
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id => $mfn, |
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ds => $ds, |
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) if ($self->{'db'}); |
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|
256 |
$log->debug("ds: ", sub { Dumper($ds) }); |
257 |
|
258 |
$log->logconfess("data structure returned is not array any more!") if wantarray; |
259 |
|
260 |
return $ds; |
261 |
|
262 |
} |
263 |
|
264 |
=head2 parse |
265 |
|
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Perform smart parsing of string, skipping delimiters for fields which aren't |
267 |
defined. It can also eval code in format starting with C<eval{...}> and |
268 |
return output or nothing depending on eval code. |
269 |
|
270 |
my $text = $webpac->parse($rec,'eval{"v901^a" eq "Deskriptor"}descriptor: v250^a', $i); |
271 |
|
272 |
=cut |
273 |
|
274 |
sub parse { |
275 |
my $self = shift; |
276 |
|
277 |
my ($rec, $format_utf8, $i) = @_; |
278 |
|
279 |
return if (! $format_utf8); |
280 |
|
281 |
my $log = $self->_get_logger(); |
282 |
|
283 |
$log->logconfess("need HASH as first argument!") if ($rec !~ /HASH/o); |
284 |
|
285 |
$i = 0 if (! $i); |
286 |
|
287 |
my $format = $self->_x($format_utf8) || $log->logconfess("can't convert '$format_utf8' from UTF-8 to ",$self->{'code_page'}); |
288 |
|
289 |
my @out; |
290 |
|
291 |
$log->debug("format: $format"); |
292 |
|
293 |
my $eval_code; |
294 |
# remove eval{...} from beginning |
295 |
$eval_code = $1 if ($format =~ s/^eval{([^}]+)}//s); |
296 |
|
297 |
my $filter_name; |
298 |
# remove filter{...} from beginning |
299 |
$filter_name = $1 if ($format =~ s/^filter{([^}]+)}//s); |
300 |
|
301 |
my $prefix; |
302 |
my $all_found=0; |
303 |
|
304 |
while ($format =~ s/^(.*?)(v|s)(\d+)(?:\^(\w))?//s) { |
305 |
|
306 |
my $del = $1 || ''; |
307 |
$prefix ||= $del if ($all_found == 0); |
308 |
|
309 |
# repeatable index |
310 |
my $r = $i; |
311 |
$r = 0 if (lc("$2") eq 's'); |
312 |
|
313 |
my $found = 0; |
314 |
my $tmp = $self->get_data(\$rec,$3,$4,$r,\$found); |
315 |
|
316 |
if ($found) { |
317 |
push @out, $del; |
318 |
push @out, $tmp; |
319 |
$all_found += $found; |
320 |
} |
321 |
} |
322 |
|
323 |
return if (! $all_found); |
324 |
|
325 |
my $out = join('',@out); |
326 |
|
327 |
if ($out) { |
328 |
# add rest of format (suffix) |
329 |
$out .= $format; |
330 |
|
331 |
# add prefix if not there |
332 |
$out = $prefix . $out if ($out !~ m/^\Q$prefix\E/); |
333 |
|
334 |
$log->debug("result: $out"); |
335 |
} |
336 |
|
337 |
if ($eval_code) { |
338 |
my $eval = $self->fill_in($rec,$eval_code,$i) || return; |
339 |
$log->debug("about to eval{$eval} format: $out"); |
340 |
return if (! $self->_eval($eval)); |
341 |
} |
342 |
|
343 |
if ($filter_name && $self->{'filter'}->{$filter_name}) { |
344 |
$log->debug("about to filter{$filter_name} format: $out"); |
345 |
$out = $self->{'filter'}->{$filter_name}->($out); |
346 |
return unless(defined($out)); |
347 |
$log->debug("filter result: $out"); |
348 |
} |
349 |
|
350 |
return $out; |
351 |
} |
352 |
|
353 |
=head2 parse_to_arr |
354 |
|
355 |
Similar to C<parse>, but returns array of all repeatable fields |
356 |
|
357 |
my @arr = $webpac->parse_to_arr($rec,'v250^a'); |
358 |
|
359 |
=cut |
360 |
|
361 |
sub parse_to_arr { |
362 |
my $self = shift; |
363 |
|
364 |
my ($rec, $format_utf8) = @_; |
365 |
|
366 |
my $log = $self->_get_logger(); |
367 |
|
368 |
$log->logconfess("need HASH as first argument!") if ($rec !~ /HASH/o); |
369 |
return if (! $format_utf8); |
370 |
|
371 |
my $i = 0; |
372 |
my @arr; |
373 |
|
374 |
while (my $v = $self->parse($rec,$format_utf8,$i++)) { |
375 |
push @arr, $v; |
376 |
} |
377 |
|
378 |
$log->debug("format '$format_utf8' returned ",--$i," elements: ", sub { join(" | ",@arr) }) if (@arr); |
379 |
|
380 |
return @arr; |
381 |
} |
382 |
|
383 |
|
384 |
=head2 fill_in |
385 |
|
386 |
Workhourse of all: takes record from in-memory structure of database and |
387 |
strings with placeholders and returns string or array of with substituted |
388 |
values from record. |
389 |
|
390 |
my $text = $webpac->fill_in($rec,'v250^a'); |
391 |
|
392 |
Optional argument is ordinal number for repeatable fields. By default, |
393 |
it's assume to be first repeatable field (fields are perl array, so first |
394 |
element is 0). |
395 |
Following example will read second value from repeatable field. |
396 |
|
397 |
my $text = $webpac->fill_in($rec,'Title: v250^a',1); |
398 |
|
399 |
This function B<does not> perform parsing of format to inteligenty skip |
400 |
delimiters before fields which aren't used. |
401 |
|
402 |
This method will automatically decode UTF-8 string to local code page |
403 |
if needed. |
404 |
|
405 |
=cut |
406 |
|
407 |
sub fill_in { |
408 |
my $self = shift; |
409 |
|
410 |
my $log = $self->_get_logger(); |
411 |
|
412 |
my $rec = shift || $log->logconfess("need data record"); |
413 |
my $format = shift || $log->logconfess("need format to parse"); |
414 |
# iteration (for repeatable fields) |
415 |
my $i = shift || 0; |
416 |
|
417 |
$log->logdie("infitite loop in format $format") if ($i > ($self->{'max_mfn'} || 9999)); |
418 |
|
419 |
# FIXME remove for speedup? |
420 |
$log->logconfess("need HASH as first argument!") if ($rec !~ /HASH/o); |
421 |
|
422 |
if (utf8::is_utf8($format)) { |
423 |
$format = $self->_x($format); |
424 |
} |
425 |
|
426 |
my $found = 0; |
427 |
|
428 |
my $eval_code; |
429 |
# remove eval{...} from beginning |
430 |
$eval_code = $1 if ($format =~ s/^eval{([^}]+)}//s); |
431 |
|
432 |
my $filter_name; |
433 |
# remove filter{...} from beginning |
434 |
$filter_name = $1 if ($format =~ s/^filter{([^}]+)}//s); |
435 |
|
436 |
# do actual replacement of placeholders |
437 |
# repeatable fields |
438 |
$format =~ s/v(\d+)(?:\^(\w))?/$self->get_data(\$rec,$1,$2,$i,\$found)/ges; |
439 |
# non-repeatable fields |
440 |
$format =~ s/s(\d+)(?:\^(\w))?/$self->get_data(\$rec,$1,$2,0,\$found)/ges; |
441 |
|
442 |
if ($found) { |
443 |
$log->debug("format: $format"); |
444 |
if ($eval_code) { |
445 |
my $eval = $self->fill_in($rec,$eval_code,$i); |
446 |
return if (! $self->_eval($eval)); |
447 |
} |
448 |
if ($filter_name && $self->{'filter'}->{$filter_name}) { |
449 |
$log->debug("filter '$filter_name' for $format"); |
450 |
$format = $self->{'filter'}->{$filter_name}->($format); |
451 |
return unless(defined($format)); |
452 |
$log->debug("filter result: $format"); |
453 |
} |
454 |
# do we have lookups? |
455 |
if ($self->{'lookup'}) { |
456 |
if ($self->{'lookup'}->can('lookup')) { |
457 |
return $self->{'lookup'}->lookup($format); |
458 |
} else { |
459 |
$log->warn("Have lookup object but can't invoke lookup method"); |
460 |
} |
461 |
} else { |
462 |
return $format; |
463 |
} |
464 |
} else { |
465 |
return; |
466 |
} |
467 |
} |
468 |
|
469 |
|
470 |
=head2 fill_in_to_arr |
471 |
|
472 |
Similar to C<fill_in>, but returns array of all repeatable fields. Usable |
473 |
for fields which have lookups, so they shouldn't be parsed but rather |
474 |
C<fill_id>ed. |
475 |
|
476 |
my @arr = $webpac->fill_in_to_arr($rec,'[v900];;[v250^a]'); |
477 |
|
478 |
=cut |
479 |
|
480 |
sub fill_in_to_arr { |
481 |
my $self = shift; |
482 |
|
483 |
my ($rec, $format_utf8) = @_; |
484 |
|
485 |
my $log = $self->_get_logger(); |
486 |
|
487 |
$log->logconfess("need HASH as first argument!") if ($rec !~ /HASH/o); |
488 |
return if (! $format_utf8); |
489 |
|
490 |
my $i = 0; |
491 |
my @arr; |
492 |
|
493 |
while (my @v = $self->fill_in($rec,$format_utf8,$i++)) { |
494 |
push @arr, @v; |
495 |
} |
496 |
|
497 |
$log->debug("format '$format_utf8' returned ",--$i," elements: ", sub { join(" | ",@arr) }) if (@arr); |
498 |
|
499 |
return @arr; |
500 |
} |
501 |
|
502 |
|
503 |
=head2 get_data |
504 |
|
505 |
Returns value from record. |
506 |
|
507 |
my $text = $self->get_data(\$rec,$f,$sf,$i,\$found); |
508 |
|
509 |
Arguments are: |
510 |
record reference C<$rec>, |
511 |
field C<$f>, |
512 |
optional subfiled C<$sf>, |
513 |
index for repeatable values C<$i>. |
514 |
|
515 |
Optinal variable C<$found> will be incremeted if there |
516 |
is field. |
517 |
|
518 |
Returns value or empty string. |
519 |
|
520 |
=cut |
521 |
|
522 |
sub get_data { |
523 |
my $self = shift; |
524 |
|
525 |
my ($rec,$f,$sf,$i,$found) = @_; |
526 |
|
527 |
if ($$rec->{$f}) { |
528 |
return '' if (! $$rec->{$f}->[$i]); |
529 |
no strict 'refs'; |
530 |
if ($sf && $$rec->{$f}->[$i]->{$sf}) { |
531 |
$$found++ if (defined($$found)); |
532 |
return $$rec->{$f}->[$i]->{$sf}; |
533 |
} elsif (! $sf && $$rec->{$f}->[$i]) { |
534 |
$$found++ if (defined($$found)); |
535 |
# it still might have subfield, just |
536 |
# not specified, so we'll dump all |
537 |
if ($$rec->{$f}->[$i] =~ /HASH/o) { |
538 |
my $out; |
539 |
foreach my $k (keys %{$$rec->{$f}->[$i]}) { |
540 |
$out .= $$rec->{$f}->[$i]->{$k}." "; |
541 |
} |
542 |
return $out; |
543 |
} else { |
544 |
return $$rec->{$f}->[$i]; |
545 |
} |
546 |
} else { |
547 |
return ''; |
548 |
} |
549 |
} else { |
550 |
return ''; |
551 |
} |
552 |
} |
553 |
|
554 |
|
555 |
=head2 apply_format |
556 |
|
557 |
Apply format specified in tag with C<format_name="name"> and |
558 |
C<format_delimiter=";;">. |
559 |
|
560 |
my $text = $webpac->apply_format($format_name,$format_delimiter,$data); |
561 |
|
562 |
Formats can contain C<lookup{...}> if you need them. |
563 |
|
564 |
=cut |
565 |
|
566 |
sub apply_format { |
567 |
my $self = shift; |
568 |
|
569 |
my ($name,$delimiter,$data) = @_; |
570 |
|
571 |
my $log = $self->_get_logger(); |
572 |
|
573 |
if (! $self->{'import_xml'}->{'format'}->{$name}) { |
574 |
$log->warn("<format name=\"$name\"> is not defined in ",$self->{'import_xml_file'}); |
575 |
return $data; |
576 |
} |
577 |
|
578 |
$log->warn("no delimiter for format $name") if (! $delimiter); |
579 |
|
580 |
my $format = $self->_x($self->{'import_xml'}->{'format'}->{$name}->{'content'}) || $log->logdie("can't find format '$name'"); |
581 |
|
582 |
my @data = split(/\Q$delimiter\E/, $data); |
583 |
|
584 |
my $out = sprintf($format, @data); |
585 |
$log->debug("using format $name [$format] on $data to produce: $out"); |
586 |
|
587 |
if ($self->{'lookup_regex'} && $out =~ $self->{'lookup_regex'}) { |
588 |
return $self->{'lookup'}->lookup($out); |
589 |
} else { |
590 |
return $out; |
591 |
} |
592 |
|
593 |
} |
594 |
|
595 |
=head2 sort_arr |
596 |
|
597 |
Sort array ignoring case and html in data |
598 |
|
599 |
my @sorted = $webpac->sort_arr(@unsorted); |
600 |
|
601 |
=cut |
602 |
|
603 |
sub sort_arr { |
604 |
my $self = shift; |
605 |
|
606 |
my $log = $self->_get_logger(); |
607 |
|
608 |
# FIXME add Schwartzian Transformation? |
609 |
|
610 |
my @sorted = sort { |
611 |
$a =~ s#<[^>]+/*>##; |
612 |
$b =~ s#<[^>]+/*>##; |
613 |
lc($b) cmp lc($a) |
614 |
} @_; |
615 |
$log->debug("sorted values: ",sub { join(", ",@sorted) }); |
616 |
|
617 |
return @sorted; |
618 |
} |
619 |
|
620 |
|
621 |
=head1 INTERNAL METHODS |
622 |
|
623 |
=head2 _sort_by_order |
624 |
|
625 |
Sort xml tags data structure accoding to C<order=""> attribute. |
626 |
|
627 |
=cut |
628 |
|
629 |
sub _sort_by_order { |
630 |
my $self = shift; |
631 |
|
632 |
my $va = $self->{'import_xml'}->{'indexer'}->{$a}->{'order'} || |
633 |
$self->{'import_xml'}->{'indexer'}->{$a}; |
634 |
my $vb = $self->{'import_xml'}->{'indexer'}->{$b}->{'order'} || |
635 |
$self->{'import_xml'}->{'indexer'}->{$b}; |
636 |
|
637 |
return $va <=> $vb; |
638 |
} |
639 |
|
640 |
=head2 _x |
641 |
|
642 |
Convert strings from C<conf/normalize/*.xml> encoding into application |
643 |
specific encoding (optinally specified using C<code_page> to C<new> |
644 |
constructor). |
645 |
|
646 |
my $text = $n->_x('normalize text string'); |
647 |
|
648 |
This is a stub so that other modules doesn't have to implement it. |
649 |
|
650 |
=cut |
651 |
|
652 |
sub _x { |
653 |
my $self = shift; |
654 |
return shift; |
655 |
} |
656 |
|
657 |
|
658 |
=head1 AUTHOR |
659 |
|
660 |
Dobrica Pavlinusic, C<< <dpavlin@rot13.org> >> |
661 |
|
662 |
=head1 COPYRIGHT & LICENSE |
663 |
|
664 |
Copyright 2005 Dobrica Pavlinusic, All Rights Reserved. |
665 |
|
666 |
This program is free software; you can redistribute it and/or modify it |
667 |
under the same terms as Perl itself. |
668 |
|
669 |
=cut |
670 |
|
671 |
1; # End of WebPAC::Normalize |