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package WebPAC::Normalize; |
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|
| 3 |
use warnings; |
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use strict; |
| 5 |
use Data::Dumper; |
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|
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=head1 NAME |
| 8 |
|
| 9 |
WebPAC::Normalize - data mungling for normalisation |
| 10 |
|
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=head1 VERSION |
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|
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Version 0.01 |
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|
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=cut |
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|
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our $VERSION = '0.01'; |
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|
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=head1 SYNOPSIS |
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|
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This package contains code that mungle data to produce normalized format. |
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|
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It contains several assumptions: |
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|
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=over |
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|
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=item * |
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|
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format of fields is defined using C<v123^a> notation for repeatable fields |
| 30 |
or C<s123^a> for single (or first) value, where C<123> is field number and |
| 31 |
C<a> is subfield. |
| 32 |
|
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=item * |
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|
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source data records (C<$rec>) have unique identifiers in field C<000> |
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|
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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 |
| 40 |
perl code that is evaluated before producing output (value of field will be |
| 41 |
interpolated before that) |
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|
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=item * |
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|
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optional C<filter{filter_name}> at B<begining of format> will apply perl |
| 46 |
code defined as code ref on format after field substitution to producing |
| 47 |
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>. |
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|
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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 |
| 56 |
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, |
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filter, lookup, format) which is important to undestand when deciding how to |
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solve your data mungling and normalisation process. |
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|
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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 |
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|
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my $n = new WebPAC::Normalize::Something( |
| 75 |
filter => { |
| 76 |
'filter_name_1' => sub { |
| 77 |
# filter code |
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return length($_); |
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}, ... |
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}, |
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db => $webpac_db_obj, |
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lookup_regex => $lookup->regex, |
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); |
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|
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Parametar C<filter> defines user supplied snippets of perl code which can |
| 86 |
be use with C<filter{...}> notation. |
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|
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Recommended parametar C<lookup_regex> is used to enable parsing of lookups |
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in structures. |
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|
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=cut |
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|
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sub new { |
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my $class = shift; |
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my $self = {@_}; |
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bless($self, $class); |
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|
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$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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B<Note: historical oddity follows> |
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|
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This method will also set C<< $webpac->{'currnet_filename'} >> if there is |
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C<< <filename> >> tag and C<< $webpac->{'headline'} >> if there is |
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C<< <headline> >> tag. |
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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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my $cache_file; |
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|
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if ($self->{'db'}) { |
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my @ds = $self->{'db'}->load_ds($rec); |
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return @ds if (@ds); |
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} |
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|
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undef $self->{'currnet_filename'}; |
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undef $self->{'headline'}; |
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|
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my @sorted_tags; |
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if ($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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|
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foreach my $tag (@{$self->{'import_xml'}->{'indexer'}->{$field}->{$self->{'tag'}}}) { |
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my $format = $tag->{'value'} || $tag->{'content'}; |
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|
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$log->debug("format: $format"); |
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|
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my @v; |
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if ($self->{'lookup_regex'} && $format =~ $self->{'lookup_regex'}) { |
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@v = $self->fill_in_to_arr($rec,$format); |
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} else { |
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@v = $self->parse_to_arr($rec,$format); |
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} |
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next if (! @v); |
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|
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if ($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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if ($field eq 'filename') { |
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$self->{'current_filename'} = join('',@v); |
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$log->debug("filename: ",$self->{'current_filename'}); |
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} elsif ($field eq 'headline') { |
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$self->{'headline'} .= join('',@v); |
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$log->debug("headline: ",$self->{'headline'}); |
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next; # don't return headline in data_structure! |
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} |
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|
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# delimiter will join repeatable fields |
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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 swish); |
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# override by type attribute |
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@types = ( $tag->{'type'} ) if ($tag->{'type'}); |
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|
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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 ||= " "; |
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|
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my $last = pop @{$row->{$type}}; |
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$d = "" if (! $last); |
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$last .= $d . join($d, @v); |
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push @{$row->{$type}}, $last; |
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|
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} else { |
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push @{$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) { |
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$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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$row->{'name'} = $name ? $self->_x($name) : $field; |
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|
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# post-sort all values in field |
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if ($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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push @ds, $row; |
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|
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$log->debug("row $field: ",sub { Dumper($row) }); |
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} |
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|
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} |
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|
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$self->{'db'}->save_ds( |
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ds => \@ds, |
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current_filename => $self->{'current_filename'}, |
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headline => $self->{'headline'}, |
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) if ($self->{'db'}); |
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|
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return @ds; |
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|
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} |
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|
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=head2 parse |
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|
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Perform smart parsing of string, skipping delimiters for fields which aren't |
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defined. It can also eval code in format starting with C<eval{...}> and |
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return output or nothing depending on eval code. |
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|
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my $text = $webpac->parse($rec,'eval{"v901^a" eq "Deskriptor"}descriptor: v250^a', $i); |
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|
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=cut |
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|
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sub parse { |
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my $self = shift; |
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|
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my ($rec, $format_utf8, $i) = @_; |
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|
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return if (! $format_utf8); |
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|
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my $log = $self->_get_logger(); |
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|
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$log->logconfess("need HASH as first argument!") if ($rec !~ /HASH/o); |
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|
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$i = 0 if (! $i); |
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|
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my $format = $self->_x($format_utf8) || $log->logconfess("can't convert '$format_utf8' from UTF-8 to ",$self->{'code_page'}); |
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|
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my @out; |
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|
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$log->debug("format: $format"); |
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|
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my $eval_code; |
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# remove eval{...} from beginning |
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$eval_code = $1 if ($format =~ s/^eval{([^}]+)}//s); |
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|
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my $filter_name; |
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# remove filter{...} from beginning |
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$filter_name = $1 if ($format =~ s/^filter{([^}]+)}//s); |
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|
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my $prefix; |
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my $all_found=0; |
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|
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while ($format =~ s/^(.*?)(v|s)(\d+)(?:\^(\w))?//s) { |
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|
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my $del = $1 || ''; |
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$prefix ||= $del if ($all_found == 0); |
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|
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# repeatable index |
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my $r = $i; |
| 296 |
$r = 0 if (lc("$2") eq 's'); |
| 297 |
|
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my $found = 0; |
| 299 |
my $tmp = $self->get_data(\$rec,$3,$4,$r,\$found); |
| 300 |
|
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if ($found) { |
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push @out, $del; |
| 303 |
push @out, $tmp; |
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$all_found += $found; |
| 305 |
} |
| 306 |
} |
| 307 |
|
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return if (! $all_found); |
| 309 |
|
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my $out = join('',@out); |
| 311 |
|
| 312 |
if ($out) { |
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# add rest of format (suffix) |
| 314 |
$out .= $format; |
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|
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# add prefix if not there |
| 317 |
$out = $prefix . $out if ($out !~ m/^\Q$prefix\E/); |
| 318 |
|
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$log->debug("result: $out"); |
| 320 |
} |
| 321 |
|
| 322 |
if ($eval_code) { |
| 323 |
my $eval = $self->fill_in($rec,$eval_code,$i) || return; |
| 324 |
$log->debug("about to eval{$eval} format: $out"); |
| 325 |
return if (! $self->_eval($eval)); |
| 326 |
} |
| 327 |
|
| 328 |
if ($filter_name && $self->{'filter'}->{$filter_name}) { |
| 329 |
$log->debug("about to filter{$filter_name} format: $out"); |
| 330 |
$out = $self->{'filter'}->{$filter_name}->($out); |
| 331 |
return unless(defined($out)); |
| 332 |
$log->debug("filter result: $out"); |
| 333 |
} |
| 334 |
|
| 335 |
return $out; |
| 336 |
} |
| 337 |
|
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=head2 parse_to_arr |
| 339 |
|
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Similar to C<parse>, but returns array of all repeatable fields |
| 341 |
|
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my @arr = $webpac->parse_to_arr($rec,'v250^a'); |
| 343 |
|
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=cut |
| 345 |
|
| 346 |
sub parse_to_arr { |
| 347 |
my $self = shift; |
| 348 |
|
| 349 |
my ($rec, $format_utf8) = @_; |
| 350 |
|
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my $log = $self->_get_logger(); |
| 352 |
|
| 353 |
$log->logconfess("need HASH as first argument!") if ($rec !~ /HASH/o); |
| 354 |
return if (! $format_utf8); |
| 355 |
|
| 356 |
my $i = 0; |
| 357 |
my @arr; |
| 358 |
|
| 359 |
while (my $v = $self->parse($rec,$format_utf8,$i++)) { |
| 360 |
push @arr, $v; |
| 361 |
} |
| 362 |
|
| 363 |
$log->debug("format '$format_utf8' returned ",--$i," elements: ", sub { join(" | ",@arr) }) if (@arr); |
| 364 |
|
| 365 |
return @arr; |
| 366 |
} |
| 367 |
|
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|
| 369 |
=head2 fill_in |
| 370 |
|
| 371 |
Workhourse of all: takes record from in-memory structure of database and |
| 372 |
strings with placeholders and returns string or array of with substituted |
| 373 |
values from record. |
| 374 |
|
| 375 |
my $text = $webpac->fill_in($rec,'v250^a'); |
| 376 |
|
| 377 |
Optional argument is ordinal number for repeatable fields. By default, |
| 378 |
it's assume to be first repeatable field (fields are perl array, so first |
| 379 |
element is 0). |
| 380 |
Following example will read second value from repeatable field. |
| 381 |
|
| 382 |
my $text = $webpac->fill_in($rec,'Title: v250^a',1); |
| 383 |
|
| 384 |
This function B<does not> perform parsing of format to inteligenty skip |
| 385 |
delimiters before fields which aren't used. |
| 386 |
|
| 387 |
This method will automatically decode UTF-8 string to local code page |
| 388 |
if needed. |
| 389 |
|
| 390 |
=cut |
| 391 |
|
| 392 |
sub fill_in { |
| 393 |
my $self = shift; |
| 394 |
|
| 395 |
my $log = $self->_get_logger(); |
| 396 |
|
| 397 |
my $rec = shift || $log->logconfess("need data record"); |
| 398 |
my $format = shift || $log->logconfess("need format to parse"); |
| 399 |
# iteration (for repeatable fields) |
| 400 |
my $i = shift || 0; |
| 401 |
|
| 402 |
$log->logdie("infitite loop in format $format") if ($i > ($self->{'max_mfn'} || 9999)); |
| 403 |
|
| 404 |
# FIXME remove for speedup? |
| 405 |
$log->logconfess("need HASH as first argument!") if ($rec !~ /HASH/o); |
| 406 |
|
| 407 |
if (utf8::is_utf8($format)) { |
| 408 |
$format = $self->_x($format); |
| 409 |
} |
| 410 |
|
| 411 |
my $found = 0; |
| 412 |
|
| 413 |
my $eval_code; |
| 414 |
# remove eval{...} from beginning |
| 415 |
$eval_code = $1 if ($format =~ s/^eval{([^}]+)}//s); |
| 416 |
|
| 417 |
my $filter_name; |
| 418 |
# remove filter{...} from beginning |
| 419 |
$filter_name = $1 if ($format =~ s/^filter{([^}]+)}//s); |
| 420 |
|
| 421 |
# do actual replacement of placeholders |
| 422 |
# repeatable fields |
| 423 |
$format =~ s/v(\d+)(?:\^(\w))?/$self->get_data(\$rec,$1,$2,$i,\$found)/ges; |
| 424 |
# non-repeatable fields |
| 425 |
$format =~ s/s(\d+)(?:\^(\w))?/$self->get_data(\$rec,$1,$2,0,\$found)/ges; |
| 426 |
|
| 427 |
if ($found) { |
| 428 |
$log->debug("format: $format"); |
| 429 |
if ($eval_code) { |
| 430 |
my $eval = $self->fill_in($rec,$eval_code,$i); |
| 431 |
return if (! $self->_eval($eval)); |
| 432 |
} |
| 433 |
if ($filter_name && $self->{'filter'}->{$filter_name}) { |
| 434 |
$log->debug("filter '$filter_name' for $format"); |
| 435 |
$format = $self->{'filter'}->{$filter_name}->($format); |
| 436 |
return unless(defined($format)); |
| 437 |
$log->debug("filter result: $format"); |
| 438 |
} |
| 439 |
# do we have lookups? |
| 440 |
if ($self->{'lookup'}) { |
| 441 |
return $self->lookup($format); |
| 442 |
} else { |
| 443 |
return $format; |
| 444 |
} |
| 445 |
} else { |
| 446 |
return; |
| 447 |
} |
| 448 |
} |
| 449 |
|
| 450 |
|
| 451 |
=head2 fill_in_to_arr |
| 452 |
|
| 453 |
Similar to C<fill_in>, but returns array of all repeatable fields. Usable |
| 454 |
for fields which have lookups, so they shouldn't be parsed but rather |
| 455 |
C<fill_id>ed. |
| 456 |
|
| 457 |
my @arr = $webpac->fill_in_to_arr($rec,'[v900];;[v250^a]'); |
| 458 |
|
| 459 |
=cut |
| 460 |
|
| 461 |
sub fill_in_to_arr { |
| 462 |
my $self = shift; |
| 463 |
|
| 464 |
my ($rec, $format_utf8) = @_; |
| 465 |
|
| 466 |
my $log = $self->_get_logger(); |
| 467 |
|
| 468 |
$log->logconfess("need HASH as first argument!") if ($rec !~ /HASH/o); |
| 469 |
return if (! $format_utf8); |
| 470 |
|
| 471 |
my $i = 0; |
| 472 |
my @arr; |
| 473 |
|
| 474 |
while (my @v = $self->fill_in($rec,$format_utf8,$i++)) { |
| 475 |
push @arr, @v; |
| 476 |
} |
| 477 |
|
| 478 |
$log->debug("format '$format_utf8' returned ",--$i," elements: ", sub { join(" | ",@arr) }) if (@arr); |
| 479 |
|
| 480 |
return @arr; |
| 481 |
} |
| 482 |
|
| 483 |
|
| 484 |
=head2 get_data |
| 485 |
|
| 486 |
Returns value from record. |
| 487 |
|
| 488 |
my $text = $self->get_data(\$rec,$f,$sf,$i,\$found); |
| 489 |
|
| 490 |
Arguments are: |
| 491 |
record reference C<$rec>, |
| 492 |
field C<$f>, |
| 493 |
optional subfiled C<$sf>, |
| 494 |
index for repeatable values C<$i>. |
| 495 |
|
| 496 |
Optinal variable C<$found> will be incremeted if there |
| 497 |
is field. |
| 498 |
|
| 499 |
Returns value or empty string. |
| 500 |
|
| 501 |
=cut |
| 502 |
|
| 503 |
sub get_data { |
| 504 |
my $self = shift; |
| 505 |
|
| 506 |
my ($rec,$f,$sf,$i,$found) = @_; |
| 507 |
|
| 508 |
if ($$rec->{$f}) { |
| 509 |
return '' if (! $$rec->{$f}->[$i]); |
| 510 |
no strict 'refs'; |
| 511 |
if ($sf && $$rec->{$f}->[$i]->{$sf}) { |
| 512 |
$$found++ if (defined($$found)); |
| 513 |
return $$rec->{$f}->[$i]->{$sf}; |
| 514 |
} elsif ($$rec->{$f}->[$i]) { |
| 515 |
$$found++ if (defined($$found)); |
| 516 |
# it still might have subfield, just |
| 517 |
# not specified, so we'll dump all |
| 518 |
if ($$rec->{$f}->[$i] =~ /HASH/o) { |
| 519 |
my $out; |
| 520 |
foreach my $k (keys %{$$rec->{$f}->[$i]}) { |
| 521 |
$out .= $$rec->{$f}->[$i]->{$k}." "; |
| 522 |
} |
| 523 |
return $out; |
| 524 |
} else { |
| 525 |
return $$rec->{$f}->[$i]; |
| 526 |
} |
| 527 |
} |
| 528 |
} else { |
| 529 |
return ''; |
| 530 |
} |
| 531 |
} |
| 532 |
|
| 533 |
|
| 534 |
=head2 apply_format |
| 535 |
|
| 536 |
Apply format specified in tag with C<format_name="name"> and |
| 537 |
C<format_delimiter=";;">. |
| 538 |
|
| 539 |
my $text = $webpac->apply_format($format_name,$format_delimiter,$data); |
| 540 |
|
| 541 |
Formats can contain C<lookup{...}> if you need them. |
| 542 |
|
| 543 |
=cut |
| 544 |
|
| 545 |
sub apply_format { |
| 546 |
my $self = shift; |
| 547 |
|
| 548 |
my ($name,$delimiter,$data) = @_; |
| 549 |
|
| 550 |
my $log = $self->_get_logger(); |
| 551 |
|
| 552 |
if (! $self->{'import_xml'}->{'format'}->{$name}) { |
| 553 |
$log->warn("<format name=\"$name\"> is not defined in ",$self->{'import_xml_file'}); |
| 554 |
return $data; |
| 555 |
} |
| 556 |
|
| 557 |
$log->warn("no delimiter for format $name") if (! $delimiter); |
| 558 |
|
| 559 |
my $format = $self->_x($self->{'import_xml'}->{'format'}->{$name}->{'content'}) || $log->logdie("can't find format '$name'"); |
| 560 |
|
| 561 |
my @data = split(/\Q$delimiter\E/, $data); |
| 562 |
|
| 563 |
my $out = sprintf($format, @data); |
| 564 |
$log->debug("using format $name [$format] on $data to produce: $out"); |
| 565 |
|
| 566 |
if ($self->{'lookup_regex'} && $out =~ $self->{'lookup_regex'}) { |
| 567 |
return $self->lookup($out); |
| 568 |
} else { |
| 569 |
return $out; |
| 570 |
} |
| 571 |
|
| 572 |
} |
| 573 |
|
| 574 |
=head2 sort_arr |
| 575 |
|
| 576 |
Sort array ignoring case and html in data |
| 577 |
|
| 578 |
my @sorted = $webpac->sort_arr(@unsorted); |
| 579 |
|
| 580 |
=cut |
| 581 |
|
| 582 |
sub sort_arr { |
| 583 |
my $self = shift; |
| 584 |
|
| 585 |
my $log = $self->_get_logger(); |
| 586 |
|
| 587 |
# FIXME add Schwartzian Transformation? |
| 588 |
|
| 589 |
my @sorted = sort { |
| 590 |
$a =~ s#<[^>]+/*>##; |
| 591 |
$b =~ s#<[^>]+/*>##; |
| 592 |
lc($b) cmp lc($a) |
| 593 |
} @_; |
| 594 |
$log->debug("sorted values: ",sub { join(", ",@sorted) }); |
| 595 |
|
| 596 |
return @sorted; |
| 597 |
} |
| 598 |
|
| 599 |
|
| 600 |
=head1 INTERNAL METHODS |
| 601 |
|
| 602 |
=head2 _sort_by_order |
| 603 |
|
| 604 |
Sort xml tags data structure accoding to C<order=""> attribute. |
| 605 |
|
| 606 |
=cut |
| 607 |
|
| 608 |
sub _sort_by_order { |
| 609 |
my $self = shift; |
| 610 |
|
| 611 |
my $va = $self->{'import_xml'}->{'indexer'}->{$a}->{'order'} || |
| 612 |
$self->{'import_xml'}->{'indexer'}->{$a}; |
| 613 |
my $vb = $self->{'import_xml'}->{'indexer'}->{$b}->{'order'} || |
| 614 |
$self->{'import_xml'}->{'indexer'}->{$b}; |
| 615 |
|
| 616 |
return $va <=> $vb; |
| 617 |
} |
| 618 |
|
| 619 |
=head2 _x |
| 620 |
|
| 621 |
Convert strings from C<conf/normalize/*.xml> encoding into application |
| 622 |
specific encoding (optinally specified using C<code_page> to C<new> |
| 623 |
constructor). |
| 624 |
|
| 625 |
my $text = $n->_x('normalize text string'); |
| 626 |
|
| 627 |
This is a stub so that other modules doesn't have to implement it. |
| 628 |
|
| 629 |
=cut |
| 630 |
|
| 631 |
sub _x { |
| 632 |
my $self = shift; |
| 633 |
return shift; |
| 634 |
} |
| 635 |
|
| 636 |
|
| 637 |
=head1 AUTHOR |
| 638 |
|
| 639 |
Dobrica Pavlinusic, C<< <dpavlin@rot13.org> >> |
| 640 |
|
| 641 |
=head1 COPYRIGHT & LICENSE |
| 642 |
|
| 643 |
Copyright 2005 Dobrica Pavlinusic, All Rights Reserved. |
| 644 |
|
| 645 |
This program is free software; you can redistribute it and/or modify it |
| 646 |
under the same terms as Perl itself. |
| 647 |
|
| 648 |
=cut |
| 649 |
|
| 650 |
1; # End of WebPAC::DB |
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