--- trunk/lib/WebPAC/Normalize.pm 2006/06/29 21:18:59 542 +++ trunk/lib/WebPAC/Normalize.pm 2006/07/03 14:30:22 571 @@ -3,33 +3,41 @@ @EXPORT = qw/ _set_rec _set_lookup _get_ds _clean_ds + _debug tag search display - marc21 + marc marc_indicators marc_repeatable_subfield + marc_compose marc_leader rec1 rec2 rec regex prefix suffix surround first lookup join_with + + split_rec_on /; use warnings; use strict; #use base qw/WebPAC::Common/; -use Data::Dumper; +use Data::Dump qw/dump/; use Encode qw/from_to/; +# debugging warn(s) +my $debug = 0; + + =head1 NAME WebPAC::Normalize - describe normalisaton rules using sets =head1 VERSION -Version 0.06 +Version 0.09 =cut -our $VERSION = '0.06'; +our $VERSION = '0.09'; =head1 SYNOPSIS @@ -43,7 +51,7 @@ Normalisation can generate multiple output normalized data. For now, supported output types (on the left side of definition) are: C, C, C and -C. +C. =head1 FUNCTIONS @@ -109,9 +117,7 @@ =cut -my $out; -my $marc21; -my $marc_encoding; +my ($out,$marc_record, $marc_encoding, $marc_repeatable_subfield, $marc_indicators); sub _get_ds { return $out; @@ -127,8 +133,7 @@ sub _clean_ds { my $a = {@_}; - $out = undef; - $marc21 = undef; + ($out,$marc_record, $marc_encoding, $marc_repeatable_subfield, $marc_indicators) = (); $marc_encoding = $a->{marc_encoding}; } @@ -146,41 +151,158 @@ $lookup = shift; } -=head2 _get_marc21_fields +=head2 _get_marc_fields + +Get all fields defined by calls to C + + $marc->add_fields( WebPAC::Normalize:_get_marc_fields() ); + +We are using I which detect repeatable fields only from +sequence of field/subfield data generated by normalization. + +Repeatable field is created when there is second occurence of same subfield or +if any of indicators are different. + +This is sane for most cases. Something like: + + 900a-1 900b-1 900c-1 + 900a-2 900b-2 + 900a-3 + +will be created from any combination of: + + 900a-1 900a-2 900a-3 900b-1 900b-2 900c-1 + +and following rules: -Get all fields defined by calls to C + marc('900','a', rec('200','a') ); + marc('900','b', rec('200','b') ); + marc('900','c', rec('200','c') ); - $marc->add_fields( WebPAC::Normalize:_get_marc21_fields() ); +which might not be what you have in mind. If you need repeatable subfield, +define it using C like this: -B: implement exceptions to magic which unrolls repeated subfields -as new field with that subfield. +.... =cut -sub _get_marc21_fields { +sub _get_marc_fields { + + return if (! $marc_record || ref($marc_record) ne 'ARRAY' || $#{ $marc_record } < 0); + + # first, sort all existing fields + # XXX might not be needed, but modern perl might randomize elements in hash + my @sorted_marc_record = sort { + $a->[0] . $a->[3] cmp $b->[0] . $b->[3] + } @{ $marc_record }; + + @sorted_marc_record = @{ $marc_record }; ### FIXME disable sorting + + # output marc fields my @m; - my $last; - foreach my $row (@{ $marc21 }) { - if ($last && ( - $last->[0] eq $row->[0] || # check if field is same - $last->[1] eq $row->[1] || # check for i1 - $last->[2] eq $row->[2] # and for i2 - ) ) { - $last->[3]->{ $row->[3] } = $row->[4]; - warn "## ++ added $row->[0] ^$row->[3]\n"; - next; - } elsif ($last) { - push @m, $last; + + # count unique field-subfields (used for offset when walking to next subfield) + my $u; + map { $u->{ $_->[0] . $_->[3] }++ } @sorted_marc_record; + + if ($debug) { + warn "## marc_repeatable_subfield ", dump( $marc_repeatable_subfield ), $/; + warn "## marc_record ", dump( $marc_record ), $/; + warn "## sorted_marc_record ", dump( \@sorted_marc_record ), $/; + warn "## subfield count ", dump( $u ), $/; + } + + my $len = $#sorted_marc_record; + my $visited; + my $i = 0; + my $field; + + foreach ( 0 .. $len ) { + + # find next element which isn't visited + while ($visited->{$i}) { + $i = ($i + 1) % ($len + 1); } - push @m, $row; + # mark it visited + $visited->{$i}++; + + my $row = $sorted_marc_record[$i]; + + # field and subfield which is key for + # marc_repeatable_subfield and u + my $fsf = $row->[0] . $row->[3]; + + if ($debug > 1) { + + print "### field so far [", $#$field, "] : ", dump( $field ), " ", $field ? 'T' : 'F', $/; + print "### this [$i]: ", dump( $row ),$/; + print "### sf: ", $row->[3], " vs ", $field->[3], + $marc_repeatable_subfield->{ $row->[0] . $row->[3] } ? ' (repeatable)' : '', $/, + if ($#$field >= 0); + + } + + # if field exists + if ( $#$field >= 0 ) { + if ( + $row->[0] ne $field->[0] || # field + $row->[1] ne $field->[1] || # i1 + $row->[2] ne $field->[2] # i2 + ) { + push @m, $field; + warn "## saved/1 ", dump( $field ),$/ if ($debug); + $field = $row; + + } elsif ( + ( $row->[3] lt $field->[-2] ) # subfield which is not next (e.g. a after c) + || + ( $row->[3] eq $field->[-2] && # same subfield, but not repeatable + ! $marc_repeatable_subfield->{ $fsf } + ) + ) { + push @m, $field; + warn "## saved/2 ", dump( $field ),$/ if ($debug); + $field = $row; + + } else { + # append new subfields to existing field + push @$field, ( $row->[3], $row->[4] ); + } + } else { + # insert first field + $field = $row; + } + + if (! $marc_repeatable_subfield->{ $fsf }) { + # make step to next subfield + $i = ($i + $u->{ $fsf } ) % ($len + 1); + } } - push @m, $last if ($last); + if ($#$field >= 0) { + push @m, $field; + warn "## saved/3 ", dump( $field ),$/ if ($debug); + } return @m; } +=head2 _debug + +Change level of debug warnings + + _debug( 2 ); + +=cut + +sub _debug { + my $l = shift; + return $debug unless defined($l); + warn "debug level $l",$/ if ($l > 0); + $debug = $l; +} + =head1 Functions to create C Those functions generally have to first in your normalization file. @@ -235,28 +357,128 @@ $out->{$name}->{search} = \@o; } -=head2 marc21 +=head2 marc_leader + +Setup fields within MARC leader or get leader + + marc_leader('05','c'); + my $leader = marc_leader(); + +=cut + +sub marc_leader { + my ($offset,$value) = @_; + + if ($offset) { + $out->{' leader'}->{ $offset } = $value; + } else { + return $out->{' leader'}; + } +} + +=head2 marc Save value for MARC field - marc21('900','a', rec('200','a') ); + marc('900','a', rec('200','a') ); + marc('001', rec('000') ); =cut -sub marc21 { - my $f = shift or die "marc21 needs field"; - die "marc21 field must be numer" unless ($f =~ /^\d+$/); +sub marc { + my $f = shift or die "marc needs field"; + die "marc field must be numer" unless ($f =~ /^\d+$/); - my $sf = shift or die "marc21 needs subfield"; + my $sf; + if ($f >= 10) { + $sf = shift or die "marc needs subfield"; + } foreach (@_) { my $v = $_; # make var read-write for Encode - next unless (defined($v) && $v !~ /^\s+$/); + next unless (defined($v) && $v !~ /^\s*$/); from_to($v, 'iso-8859-2', $marc_encoding) if ($marc_encoding); - push @{ $marc21 }, [ $f, ' ', ' ', $sf => $v ]; + my ($i1,$i2) = defined($marc_indicators->{$f}) ? @{ $marc_indicators->{$f} } : (' ',' '); + if (defined $sf) { + push @{ $marc_record }, [ $f, $i1, $i2, $sf => $v ]; + } else { + push @{ $marc_record }, [ $f, $v ]; + } } } +=head2 marc_repeatable_subfield + +Save values for MARC repetable subfield + + marc_repeatable_subfield('910', 'z', rec('909') ); + +=cut + +sub marc_repeatable_subfield { + my ($f,$sf) = @_; + die "marc_repeatable_subfield need field and subfield!\n" unless ($f && $sf); + $marc_repeatable_subfield->{ $f . $sf }++; + marc(@_); +} + +=head2 marc_indicators + +Set both indicators for MARC field + + marc_indicators('900', ' ', 1); + +Any indicator value other than C<0-9> will be treated as undefined. + +=cut + +sub marc_indicators { + my $f = shift || die "marc_indicators need field!\n"; + my ($i1,$i2) = @_; + die "marc_indicators($f, ...) need i1!\n" unless(defined($i1)); + die "marc_indicators($f, $i1, ...) need i2!\n" unless(defined($i2)); + + $i1 = ' ' if ($i1 !~ /^\d$/); + $i2 = ' ' if ($i2 !~ /^\d$/); + @{ $marc_indicators->{$f} } = ($i1,$i2); +} + +=head2 marc_compose + +Save values for each MARC subfield explicitly + + marc_compose('900', + 'a', rec('200','a') + 'b', rec('201','a') + 'a', rec('200','b') + 'c', rec('200','c') + ); + +=cut + +sub marc_compose { + my $f = shift or die "marc_compose needs field"; + die "marc_compose field must be numer" unless ($f =~ /^\d+$/); + + my ($i1,$i2) = defined($marc_indicators->{$f}) ? @{ $marc_indicators->{$f} } : (' ',' '); + my $m = [ $f, $i1, $i2 ]; + + while (@_) { + my $sf = shift or die "marc_compose $f needs subfield"; + my $v = shift; + + next unless (defined($v) && $v !~ /^\s*$/); + from_to($v, 'iso-8859-2', $marc_encoding) if ($marc_encoding); + push @$m, ( $sf, $v ); + warn "## ++ marc_compose($f,$sf,$v) ", dump( $m ),$/ if ($debug > 1); + } + + warn "## marc_compose(d) ", dump( $m ),$/ if ($debug > 1); + + push @{ $marc_record }, $m if ($#{$m} > 2); +} + + =head1 Functions to extract data from input This function should be used inside functions to create C described @@ -274,7 +496,9 @@ sub rec1 { my $f = shift; + warn "rec1($f) = ", dump( $rec->{$f} ), $/ if ($debug > 1); return unless (defined($rec) && defined($rec->{$f})); + warn "rec1($f) = ", dump( $rec->{$f} ), $/ if ($debug > 1); if (ref($rec->{$f}) eq 'ARRAY') { return map { if (ref($_) eq 'HASH') { @@ -331,7 +555,7 @@ sub regex { my $r = shift; my @out; - #warn "r: $r\n",Dumper(\@_); + #warn "r: $r\n", dump(\@_); foreach my $t (@_) { next unless ($t); eval "\$t =~ $r"; @@ -425,5 +649,41 @@ return join($d, grep { defined($_) && $_ ne '' } @_); } +=head2 split_rec_on + +Split record subfield on some regex and take one of parts out + + $a_before_semi_column = + split_rec_on('200','a', /\s*;\s*/, $part); + +C<$part> is optional number of element. First element is +B<1>, not 0! + +If there is no C<$part> parameter or C<$part> is 0, this function will +return all values produced by splitting. + +=cut + +sub split_rec_on { + die "split_rec_on need (fld,sf,regex[,part]" if ($#_ < 2); + + my ($fld, $sf, $regex, $part) = @_; + warn "### regex ", ref($regex), $regex, $/ if ($debug > 2); + + my @r = rec( $fld, $sf ); + my $v = shift @r; + warn "### first rec($fld,$sf) = ",dump($v),$/ if ($debug > 2); + + return '' if( ! defined($v) || $v =~ /^\s*$/); + + my @s = split( $regex, $v ); + warn "## split_rec_on($fld,$sf,$regex,$part) = ",dump(@s),$/ if ($debug > 1); + if ($part && $part > 0) { + return $s[ $part - 1 ]; + } else { + return @s; + } +} + # END 1;