--- trunk/lib/WebPAC/Normalize.pm	2006/09/11 14:28:56	668
+++ trunk/lib/WebPAC/Normalize.pm	2007/11/27 22:31:09	1066
@@ -1,22 +1,26 @@
 package WebPAC::Normalize;
 use Exporter 'import';
-@EXPORT = qw/
-	_set_rec _set_lookup
+our @EXPORT = qw/
+	_set_ds _set_lookup
+	_set_load_row
 	_get_ds _clean_ds
 	_debug
 	_pack_subfields_hash
 
-	tag search display
-	marc marc_indicators marc_repeatable_subfield
-	marc_compose marc_leader
-	marc_duplicate marc_remove
-	marc_original_order
+	to
+	search_display search display sorted
 
 	rec1 rec2 rec
+	frec frec_eq frec_ne
 	regex prefix suffix surround
 	first lookup join_with
+	save_into_lookup
 
 	split_rec_on
+
+	get set
+	count
+
 /;
 
 use warnings;
@@ -24,23 +28,32 @@
 
 #use base qw/WebPAC::Common/;
 use Data::Dump qw/dump/;
-use Storable qw/dclone/;
+use Carp qw/confess/;
 
 # debugging warn(s)
 my $debug = 0;
+_debug( $debug );
 
+# FIXME
+use WebPAC::Normalize::ISBN;
+push @EXPORT, ( 'isbn_10', 'isbn_13' );
+
+use WebPAC::Normalize::MARC;
+push @EXPORT, ( qw/
+	marc marc_indicators marc_repeatable_subfield
+	marc_compose marc_leader marc_fixed
+	marc_duplicate marc_remove marc_count
+	marc_original_order
+	marc_template
+/);
 
 =head1 NAME
 
 WebPAC::Normalize - describe normalisaton rules using sets
 
-=head1 VERSION
-
-Version 0.19
-
 =cut
 
-our $VERSION = '0.19';
+our $VERSION = '0.36';
 
 =head1 SYNOPSIS
 
@@ -53,7 +66,7 @@
 C<perl -c normalize.pl>.
 
 Normalisation can generate multiple output normalized data. For now, supported output
-types (on the left side of definition) are: C<tag>, C<display>, C<search> and
+types (on the left side of definition) are: C<search_display>, C<display>, C<search> and
 C<marc>.
 
 =head1 FUNCTIONS
@@ -66,16 +79,23 @@
 Return data structure
 
   my $ds = WebPAC::Normalize::data_structure(
-  	lookup => $lookup->lookup_hash,
+	lookup => $lookup_hash,
 	row => $row,
 	rules => $normalize_pl_config,
 	marc_encoding => 'utf-8',
 	config => $config,
+	load_row_coderef => sub {
+		my ($database,$input,$mfn) = @_;
+		$store->load_row( database => $database, input => $input, id => $mfn );
+	},
   );
 
-Options C<lookup>, C<row>, C<rules> and C<log> are mandatory while all
+Options C<row>, C<rules> and C<log> are mandatory while all
 other are optional.
 
+C<load_row_coderef> is closure only used when executing lookups, so they will
+die if it's not defined.
+
 This function will B<die> if normalizastion can't be evaled.
 
 Since this function isn't exported you have to call it with 
@@ -83,37 +103,51 @@
 
 =cut
 
+my $load_row_coderef;
+
 sub data_structure {
 	my $arg = {@_};
 
 	die "need row argument" unless ($arg->{row});
 	die "need normalisation argument" unless ($arg->{rules});
 
-	no strict 'subs';
-	_set_lookup( $arg->{lookup} );
-	_set_rec( $arg->{row} );
-	_set_config( $arg->{config} );
+	_set_lookup( $arg->{lookup} ) if defined($arg->{lookup});
+	_set_ds( $arg->{row} );
+	_set_config( $arg->{config} ) if defined($arg->{config});
 	_clean_ds( %{ $arg } );
-	eval "$arg->{rules}";
+	$load_row_coderef = $arg->{load_row_coderef};
+
+	no strict 'subs';
+	no warnings 'redefine';
+	eval "$arg->{rules};";
 	die "error evaling $arg->{rules}: $@\n" if ($@);
 
 	return _get_ds();
 }
 
-=head2 _set_rec
+=head2 _set_ds
 
 Set current record hash
 
-  _set_rec( $rec );
+  _set_ds( $rec );
 
 =cut
 
 my $rec;
 
-sub _set_rec {
+sub _set_ds {
 	$rec = shift or die "no record hash";
+	$WebPAC::Normalize::MARC::rec = $rec;
 }
 
+=head2
+
+  my $rec = _get_rec();
+
+=cut
+
+sub _get_rec { $rec };
+
 =head2 _set_config
 
 Set current config hash
@@ -150,10 +184,10 @@
 
 =cut
 
-my ($out, $marc_record, $marc_encoding, $marc_repeatable_subfield, $marc_indicators);
-my ($marc_record_offset, $marc_fetch_offset) = (0, 0);
+my $out;
 
 sub _get_ds {
+#warn "## out = ",dump($out);
 	return $out;
 }
 
@@ -167,9 +201,8 @@
 
 sub _clean_ds {
 	my $a = {@_};
-	($out,$marc_record, $marc_encoding, $marc_repeatable_subfield, $marc_indicators) = ();
-	($marc_record_offset, $marc_fetch_offset) = (0,0);
-	$marc_encoding = $a->{marc_encoding};
+	$out = undef;
+	WebPAC::Normalize::MARC::_clean();
 }
 
 =head2 _set_lookup
@@ -186,178 +219,35 @@
 	$lookup = shift;
 }
 
-=head2 _get_marc_fields
-
-Get all fields defined by calls to C<marc>
-
-	$marc->add_fields( WebPAC::Normalize:_get_marc_fields() );
-
-We are using I<magic> 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:
-
-  marc('900','a', rec('200','a') );
-  marc('900','b', rec('200','b') );
-  marc('900','c', rec('200','c') );
-
-which might not be what you have in mind. If you need repeatable subfield,
-define it using C<marc_repeatable_subfield> like this:
-
-  marc_repeatable_subfield('900','a');
-  marc('900','a', rec('200','a') );
-  marc('900','b', rec('200','b') );
-  marc('900','c', rec('200','c') );
-
-will create:
-
-  900a-1 900a-2 900a-3 900b-1 900c-1
-  900b-2
-
-There is also support for returning next or specific using:
-
-  while (my $mf = WebPAC::Normalize:_get_marc_fields( fetch_next => 1 ) ) {
-  	# do something with $mf
-  }
-
-will always return fields from next MARC record or
+=head2 _get_lookup
 
-  my $mf = WebPAC::Normalize::_get_marc_fields( offset => 42 );
+Get current lookup hash
 
-will return 42th copy record (if it exists).
+  my $lookup = _get_lookup();
 
 =cut
 
-sub _get_marc_fields {
-
-	my $arg = {@_};
-	warn "### _get_marc_fields arg: ", dump($arg), $/ if ($debug > 2);
-	my $offset = $marc_fetch_offset;
-	if ($arg->{offset}) {
-		$offset = $arg->{offset};
-	} elsif($arg->{fetch_next}) {
-		$marc_fetch_offset++;
-	}
-
-	return if (! $marc_record || ref($marc_record) ne 'ARRAY');
-
-	warn "### full marc_record = ", dump( @{ $marc_record }), $/ if ($debug > 2);
-
-	my $marc_rec = $marc_record->[ $offset ];
-
-	warn "## _get_marc_fields (at offset: $offset) -- marc_record = ", dump( @$marc_rec ), $/ if ($debug > 1);
-
-	return if (! $marc_rec || ref($marc_rec) ne 'ARRAY' || $#{ $marc_rec } < 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_rec };
-
-	@sorted_marc_record = @{ $marc_rec };	### FIXME disable sorting
-	
-	# output marc fields
-	my @m;
-
-	# 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 ), $/ if ( $marc_repeatable_subfield );
-		warn "## marc_record[$offset] = ", dump( $marc_rec ), $/;
-		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);
-		}
-
-		# mark it visited
-		$visited->{$i}++;
-
-		my $row = dclone( $sorted_marc_record[$i] );
+sub _get_lookup {
+	return $lookup;
+}
 
-		# 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);
+=head2 _set_load_row
 
-		}
+Setup code reference which will return L<data_structure> from
+L<WebPAC::Store>
 
-		# 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 = $row;
+  _set_load_row(sub {
+		my ($database,$input,$mfn) = @_;
+		$store->load_row( database => $database, input => $input, id => $mfn );
+  });
 
-			} 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);
-		}
-	}
+=cut
 
-	if ($#$field >= 0) {
-		push @m, $field;
-		warn "## saved/3 ", dump( $field ),$/ if ($debug);
-	}
+sub _set_load_row {
+	my $coderef = shift;
+	confess "argument isn't CODE" unless ref($coderef) eq 'CODE';
 
-	return \@m;
+	$load_row_coderef = $coderef;
 }
 
 =head2 _debug
@@ -373,346 +263,86 @@
 	return $debug unless defined($l);
 	warn "debug level $l",$/ if ($l > 0);
 	$debug = $l;
+	$WebPAC::Normalize::MARC::debug = $debug;
 }
 
 =head1 Functions to create C<data_structure>
 
 Those functions generally have to first in your normalization file.
 
-=head2 tag
+=head2 to
 
-Define new tag for I<search> and I<display>.
+Generic way to set values for some name
 
-  tag('Title', rec('200','a') );
+  to('field-name', 'name-value' => rec('200','a') );
 
+There are many helpers defined below which might be easier to use.
 
 =cut
 
-sub tag {
-	my $name = shift or die "tag needs name as first argument";
+sub to {
+	my $type = shift or confess "need type -- BUG?";
+	my $name = shift or confess "needs name as first argument";
 	my @o = grep { defined($_) && $_ ne '' } @_;
 	return unless (@o);
-	$out->{$name}->{tag} = $name;
-	$out->{$name}->{search} = \@o;
-	$out->{$name}->{display} = \@o;
+	$out->{$name}->{$type} = \@o;
 }
 
-=head2 display
+=head2 search_display
 
-Define tag just for I<display>
+Define output for L<search> and L<display> at the same time
 
-  @v = display('Title', rec('200','a') );
-
-=cut
-
-sub display {
-	my $name = shift or die "display needs name as first argument";
-	my @o = grep { defined($_) && $_ ne '' } @_;
-	return unless (@o);
-	$out->{$name}->{tag} = $name;
-	$out->{$name}->{display} = \@o;
-}
-
-=head2 search
-
-Prepare values just for I<search>
-
-  @v = search('Title', rec('200','a') );
+  search_display('Title', rec('200','a') );
 
 =cut
 
-sub search {
-	my $name = shift or die "search needs name as first argument";
+sub search_display {
+	my $name = shift or die "search_display needs name as first argument";
 	my @o = grep { defined($_) && $_ ne '' } @_;
 	return unless (@o);
-	$out->{$name}->{tag} = $name;
 	$out->{$name}->{search} = \@o;
+	$out->{$name}->{display} = \@o;
 }
 
-=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
-
-  marc('900','a', rec('200','a') );
-  marc('001', rec('000') );
-
-=cut
-
-sub marc {
-	my $f = shift or die "marc needs field";
-	die "marc field must be numer" unless ($f =~ /^\d+$/);
-
-	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) && $v !~ /^\s*$/);
-		my ($i1,$i2) = defined($marc_indicators->{$f}) ? @{ $marc_indicators->{$f} } : (' ',' ');
-		if (defined $sf) {
-			push @{ $marc_record->[ $marc_record_offset ] }, [ $f, $i1, $i2, $sf => $v ];
-		} else {
-			push @{ $marc_record->[ $marc_record_offset ] }, [ $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')
-  );
+=head2 tag
 
-If you specify C<+> for subfield, value will be appended
-to previous defined subfield.
+Old name for L<search_display>, it will probably be removed at one point.
 
 =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, $i2 ];
-
-	warn "### marc_compose input subfields = ", dump(@_),$/ if ($debug > 2);
-
-	if ($#_ % 2 != 1) {
-		die "ERROR: marc_compose",dump($f,@_)," not valid (must be even).\nDo you need to add first() or join() around some argument?\n";
-	}
-
-	while (@_) {
-		my $sf = shift;
-		my $v = shift;
-
-		next unless (defined($v) && $v !~ /^\s*$/);
-		warn "## ++ marc_compose($f,$sf,$v) ", dump( $m ),$/ if ($debug > 1);
-		if ($sf ne '+') {
-			push @$m, ( $sf, $v );
-		} else {
-			$m->[ $#$m ] .= $v;
-		}
-	}
-
-	warn "## marc_compose current marc = ", dump( $m ),$/ if ($debug > 1);
-
-	push @{ $marc_record->[ $marc_record_offset ] }, $m if ($#{$m} > 2);
+sub tag {
+	search_display( @_ );
 }
 
-=head2 marc_duplicate
-
-Generate copy of current MARC record and continue working on copy
+=head2 display
 
-  marc_duplicate();
+Define output just for I<display>
 
-Copies can be accessed using C<< _get_marc_fields( fetch_next => 1 ) >> or
-C<< _get_marc_fields( offset => 42 ) >>.
+  @v = display('Title', rec('200','a') );
 
 =cut
 
-sub marc_duplicate {
-	 my $m = $marc_record->[ -1 ];
-	 die "can't duplicate record which isn't defined" unless ($m);
-	 push @{ $marc_record }, dclone( $m );
-	 warn "## marc_duplicate = ", dump(@$marc_record), $/ if ($debug > 1);
-	 $marc_record_offset = $#{ $marc_record };
-	 warn "## marc_record_offset = $marc_record_offset", $/ if ($debug > 1);
-}
-
-=head2 marc_remove
+sub display { to( 'display', @_ ) }
 
-Remove some field or subfield from MARC record.
-
-  marc_remove('200');
-  marc_remove('200','a');
-
-This will erase field C<200> or C<200^a> from current MARC record.
+=head2 search
 
-This is useful after calling C<marc_duplicate> or on it's own (but, you
-should probably just remove that subfield definition if you are not
-using C<marc_duplicate>).
+Prepare values just for I<search>
 
-FIXME: support fields < 10.
+  @v = search('Title', rec('200','a') );
 
 =cut
 
-sub marc_remove {
-	my ($f, $sf) = @_;
-
-	die "marc_remove needs record number" unless defined($f);
-
-	my $marc = $marc_record->[ $marc_record_offset ];
+sub search { to( 'search', @_ ) }
 
-	warn "### marc_remove before = ", dump( $marc ), $/ if ($debug > 2);
-
-	my $i = 0;
-	foreach ( 0 .. $#{ $marc } ) {
-		last unless (defined $marc->[$i]);
-		warn "#### working on ",dump( @{ $marc->[$i] }), $/ if ($debug > 3);
-		if ($marc->[$i]->[0] eq $f) {
-			if (! defined $sf) {
-				# remove whole field
-				splice @$marc, $i, 1;
-				warn "#### slice \@\$marc, $i, 1 = ",dump( @{ $marc }), $/ if ($debug > 3);
-				$i--;
-			} else {
-				foreach my $j ( 0 .. (( $#{ $marc->[$i] } - 3 ) / 2) ) {
-					my $o = ($j * 2) + 3;
-					if ($marc->[$i]->[$o] eq $sf) {
-						# remove subfield
-						splice @{$marc->[$i]}, $o, 2;
-						warn "#### slice \@{\$marc->[$i]}, $o, 2 = ", dump( @{ $marc }), $/ if ($debug > 3);
-						# is record now empty?
-						if ($#{ $marc->[$i] } == 2) {
-							splice @$marc, $i, 1;
-							warn "#### slice \@\$marc, $i, 1 = ", dump( @{ $marc }), $/ if ($debug > 3);
-							$i--;
-						};
-					}
-				}
-			}
-		}
-		$i++;
-	}
+=head2 sorted
 
-	warn "### marc_remove($f", $sf ? ",$sf" : "", ") after = ", dump( $marc ), $/ if ($debug > 2);
-
-	$marc_record->[ $marc_record_offset ] = $marc;
-
-	warn "## full marc_record = ", dump( @{ $marc_record }), $/ if ($debug > 1);
-}
-
-=head2 marc_original_order
-
-Copy all subfields preserving original order to marc field.
-
-  marc_original_order( marc_field_number, original_input_field_number );
-
-Please note that field numbers are consistent with other commands (marc
-field number first), but somewhat counter-intuitive (destination and then
-source).
-
-You might want to use this command if you are just renaming subfields or
-using pre-processing modify_record in C<config.yml> and don't need any
-post-processing or want to preserve order of original subfields.
+Insert into lists which will be automatically sorted
 
+ sorted('Title', rec('200','a') );
 
 =cut
 
-sub marc_original_order {
-
-	my ($to, $from) = @_;
-	die "marc_original_order needs from and to fields\n" unless ($from && $to);
-
-	return unless defined($rec->{$from});
-
-	my $r = $rec->{$from};
-	die "record field $from isn't array\n" unless (ref($r) eq 'ARRAY');
-
-	my ($i1,$i2) = defined($marc_indicators->{$to}) ? @{ $marc_indicators->{$to} } : (' ',' ');
-	warn "## marc_original_order($to,$from) source = ", dump( $r ),$/ if ($debug > 1);
-
-	foreach my $d (@$r) {
-
-		if (! defined($d->{subfields}) && ref($d->{subfields}) ne 'ARRAY') {
-			warn "# marc_original_order($to,$from): field $from doesn't have subfields specification\n";
-			next;
-		}
-	
-		my @sfs = @{ $d->{subfields} };
-
-		die "field $from doesn't have even number of subfields specifications\n" unless($#sfs % 2 == 1);
-
-		warn "#--> d: ",dump($d), "\n#--> sfs: ",dump(@sfs),$/ if ($debug > 2);
-
-		my $m = [ $to, $i1, $i2 ];
-
-		while (my $sf = shift @sfs) {
-
-			warn "#--> sf: ",dump($sf), $/ if ($debug > 2);
-			my $offset = shift @sfs;
-			die "corrupted sufields specification for field $from\n" unless defined($offset);
-
-			my $v;
-			if (ref($d->{$sf}) eq 'ARRAY') {
-				$v = $d->{$sf}->[$offset] if (defined($d->{$sf}->[$offset]));
-			} elsif ($offset == 0) {
-				$v = $d->{$sf};
-			} else {
-				die "field $from subfield '$sf' need occurence $offset which doesn't exist", dump($d->{$sf});
-			}
-			push @$m, ( $sf, $v ) if (defined($v));
-		}
-
-		if ($#{$m} > 2) {
-			push @{ $marc_record->[ $marc_record_offset ] }, $m;
-		}
-	}
-
-	warn "## marc_record = ", dump( $marc_record ),$/ if ($debug > 1);
-}
+sub sorted { to( 'sorted', @_ ) }
 
 
 =head1 Functions to extract data from input
@@ -722,7 +352,11 @@
 
 =head2 _pack_subfields_hash
 
- @values = _pack_subfields_hash( $h, $include_subfields )
+ @subfields = _pack_subfields_hash( $h );
+ $subfields = _pack_subfields_hash( $h, 1 );
+
+Return each subfield value in array or pack them all together and return scalar
+with subfields (denoted by C<^>) and values.
 
 =cut
 
@@ -732,6 +366,9 @@
 
 	my ($h,$include_subfields) = @_;
 
+	# sanity and ease of use
+	return $h if (ref($h) ne 'HASH');
+
 	if ( defined($h->{subfields}) ) {
 		my $sfs = delete $h->{subfields} || die "no subfields?";
 		my @out;
@@ -741,11 +378,11 @@
 			my $o = shift @$sfs;
 			if ($o == 0 && ref( $h->{$sf} ) ne 'ARRAY' ) {
 				# single element subfields are not arrays
-warn "====> $sf $o / $#$sfs ", dump( $sfs, $h->{$sf} ), "\n";
+#warn "====> $sf $o / $#$sfs ", dump( $sfs, $h->{$sf} ), "\n";
 
 				push @out, $h->{$sf};
 			} else {
-warn "====> $sf $o / $#$sfs ", dump( $sfs, $h->{$sf} ), "\n";
+#warn "====> $sf $o / $#$sfs ", dump( $sfs, $h->{$sf} ), "\n";
 				push @out, $h->{$sf}->[$o];
 			}
 		}
@@ -821,7 +458,7 @@
 		} else {
 			$_->{$sf};
 		}
-	} grep { ref($_) eq 'HASH' && $_->{$sf} } @{ $rec->{$f} };
+	} grep { ref($_) eq 'HASH' && defined $_->{$sf} } @{ $rec->{$f} };
 }
 
 =head2 rec
@@ -831,6 +468,9 @@
   @v = rec('200')
   @v = rec('200','a')
 
+If rec() returns just single value, it will
+return scalar, not array.
+
 =cut
 
 sub rec {
@@ -840,13 +480,63 @@
 	} elsif ($#_ == 1) {
 		@out = rec2(@_);
 	}
-	if (@out) {
+	if ($#out == 0 && ! wantarray) {
+		return $out[0];
+	} elsif (@out) {
 		return @out;
 	} else {
 		return '';
 	}
 }
 
+=head2 frec
+
+Returns first value from field
+
+  $v = frec('200');
+  $v = frec('200','a');
+
+=cut
+
+sub frec {
+	my @out = rec(@_);
+	warn "rec(",dump(@_),") has more than one return value, ignoring\n" if $#out > 0;
+	return shift @out;
+}
+
+=head2 frec_eq
+
+=head2 frec_ne
+
+Check if first values from two fields are same or different
+
+  if ( frec_eq( 900 => 'a', 910 => 'c' ) ) {
+  	# values are same
+  } else {
+    # values are different
+  }
+
+Strictly speaking C<frec_eq> and C<frec_ne> wouldn't be needed if you
+could write something like:
+
+  if ( frec( '900','a' ) eq frec( '910','c' ) ) {
+  	# yada tada
+  }
+
+but you can't since our parser L<WebPAC::Parser> will remove all whitespaces
+in order to parse text and create invalid function C<eqfrec>.
+
+=cut
+
+sub frec_eq {
+	my ( $f1,$sf1, $f2, $sf2 ) = @_;
+	return (rec( $f1, $sf1 ))[0] eq (rec( $f2, $sf2 ))[0];
+}
+
+sub frec_ne {
+	return ! frec_eq( @_ );
+}
+
 =head2 regex
 
 Apply regex to some or all values
@@ -876,7 +566,8 @@
 =cut
 
 sub prefix {
-	my $p = shift or return;
+	my $p = shift;
+	return @_ unless defined( $p );
 	return map { $p . $_ } grep { defined($_) } @_;
 }
 
@@ -889,7 +580,8 @@
 =cut
 
 sub suffix {
-	my $s = shift or die "suffix needs string as first argument";
+	my $s = shift;
+	return @_ unless defined( $s );
 	return map { $_ . $s } grep { defined($_) } @_;
 }
 
@@ -902,8 +594,10 @@
 =cut
 
 sub surround {
-	my $p = shift or die "surround need prefix as first argument";
-	my $s = shift or die "surround needs suffix as second argument";
+	my $p = shift;
+	my $s = shift;
+	$p = '' unless defined( $p );
+	$s = '' unless defined( $s );
 	return map { $p . $_ . $s } grep { defined($_) } @_;
 }
 
@@ -924,21 +618,152 @@
 
 Consult lookup hashes for some value
 
-  @v = lookup( $v );
-  @v = lookup( @v );
+  @v = lookup(
+  	sub {
+		'ffkk/peri/mfn'.rec('000')
+	},
+	'ffkk','peri','200-a-200-e',
+	sub {
+		first(rec(200,'a')).' '.first(rec('200','e'))
+	}
+  );
+
+Code like above will be B<automatically generated> using L<WebPAC::Parse> from
+normal lookup definition in C<conf/lookup/something.pl> which looks like:
+
+  lookup(
+	# which results to return from record recorded in lookup
+	sub { 'ffkk/peri/mfn' . rec('000') },
+	# from which database and input
+	'ffkk','peri',
+	# such that following values match
+	sub { first(rec(200,'a')) . ' ' . first(rec('200','e')) },
+	# if this part is missing, we will try to match same fields
+	# from lookup record and current one, or you can override
+	# which records to use from current record using
+	sub { rec('900','x') . ' ' . rec('900','y') },
+  )
+
+You can think about this lookup as SQL (if that helps):
+
+  select
+  	sub { what }
+  from
+  	database, input
+  where
+    sub { filter from lookuped record }
+  having
+    sub { optional filter on current record }
+
+Easy as pie, right?
 
 =cut
 
 sub lookup {
-	my $k = shift or return;
-	return unless (defined($lookup->{$k}));
-	if (ref($lookup->{$k}) eq 'ARRAY') {
-		return @{ $lookup->{$k} };
+	my ($what, $database, $input, $key, $having) = @_;
+
+	confess "lookup needs 5 arguments: what, database, input, key, having\n" unless ($#_ == 4);
+
+	warn "## lookup ($database, $input, $key)", $/ if ($debug > 1);
+	return unless (defined($lookup->{$database}->{$input}->{$key}));
+
+	confess "lookup really need load_row_coderef added to data_structure\n" unless ($load_row_coderef);
+
+	my $mfns;
+	my @having = $having->();
+
+	warn "## having = ", dump( @having ) if ($debug > 2);
+
+	foreach my $h ( @having ) {
+		if (defined($lookup->{$database}->{$input}->{$key}->{$h})) {
+			warn "lookup for $database/$input/$key/$h return ",dump($lookup->{$database}->{$input}->{$key}->{$h}),"\n" if ($debug);
+			$mfns->{$_}++ foreach keys %{ $lookup->{$database}->{$input}->{$key}->{$h} };
+		}
+	}
+
+	return unless ($mfns);
+
+	my @mfns = sort keys %$mfns;
+
+	warn "# lookup loading $database/$input/$key mfn ", join(",",@mfns)," having ",dump(@having),"\n" if ($debug);
+
+	my $old_rec = $rec;
+	my @out;
+
+	foreach my $mfn (@mfns) {
+		$rec = $load_row_coderef->( $database, $input, $mfn );
+
+		warn "got $database/$input/$mfn = ", dump($rec), $/ if ($debug);
+
+		my @vals = $what->();
+
+		push @out, ( @vals );
+
+		warn "lookup for mfn $mfn returned ", dump(@vals), $/ if ($debug);
+	}
+
+#	if (ref($lookup->{$k}) eq 'ARRAY') {
+#		return @{ $lookup->{$k} };
+#	} else {
+#		return $lookup->{$k};
+#	}
+
+	$rec = $old_rec;
+
+	warn "## lookup returns = ", dump(@out), $/ if ($debug);
+
+	if ($#out == 0) {
+		return $out[0];
 	} else {
-		return $lookup->{$k};
+		return @out;
 	}
 }
 
+=head2 save_into_lookup
+
+Save value into lookup. It associates current database, input
+and specific keys with one or more values which will be
+associated over MFN.
+
+MFN will be extracted from first occurence current of field 000
+in current record, or if it doesn't exist from L<_set_config> C<_mfn>.
+
+  my $nr = save_into_lookup($database,$input,$key,sub {
+ 	# code which produce one or more values 
+  });
+
+It returns number of items saved.
+
+This function shouldn't be called directly, it's called from code created by
+L<WebPAC::Parser>. 
+
+=cut
+
+sub save_into_lookup {
+	my ($database,$input,$key,$coderef) = @_;
+	die "save_into_lookup needs database" unless defined($database);
+	die "save_into_lookup needs input" unless defined($input);
+	die "save_into_lookup needs key" unless defined($key);
+	die "save_into_lookup needs CODE" unless ( defined($coderef) && ref($coderef) eq 'CODE' );
+
+	warn "## save_into_lookup rec = ", dump($rec), " config = ", dump($config), $/ if ($debug > 2);
+
+	my $mfn = 
+		defined($rec->{'000'}->[0])	?	$rec->{'000'}->[0]	:
+		defined($config->{_mfn})	?	$config->{_mfn}		:
+										die "mfn not defined or zero";
+
+	my $nr = 0;
+
+	foreach my $v ( $coderef->() ) {
+		$lookup->{$database}->{$input}->{$key}->{$v}->{$mfn}++;
+		warn "# saved lookup $database/$input/$key [$v] $mfn\n" if ($debug > 1);
+		$nr++;
+	}
+
+	return $nr;
+}
+
 =head2 config
 
 Consult config values stored in C<config.yml>
@@ -947,7 +772,6 @@
   $database_code = config();	# use _ from hash
   $database_name = config('name');
   $database_input_name = config('input name');
-  $tag = config('input normalize tag');
 
 Up to three levels are supported.
 
@@ -1008,7 +832,7 @@
 
 sub id {
 	my $mfn = $config->{_mfn} || die "no _mfn in config data";
-	return $mfn . $#{$marc_record} ? $#{$marc_record} + 1 : '';
+	return $mfn . ( WebPAC::Normalize::MARC::_created_marc_records() || '' );
 }
 
 =head2 join_with
@@ -1063,5 +887,45 @@
 	}
 }
 
+my $hash;
+
+=head2 set
+
+  set( key => 'value' );
+
+=cut
+
+sub set {
+	my ($k,$v) = @_;
+	warn "## set ( $k => ", dump($v), " )", $/ if ( $debug );
+	$hash->{$k} = $v;
+};
+
+=head2 get
+
+  get( 'key' );
+
+=cut
+
+sub get {
+	my $k = shift || return;
+	my $v = $hash->{$k};
+	warn "## get $k = ", dump( $v ), $/ if ( $debug );
+	return $v;
+}
+
+=head2 count
+
+  if ( count( @result ) == 1 ) {
+  	# do something if only 1 result is there
+  }
+
+=cut
+
+sub count {
+	warn "## count ",dump(@_),$/ if ( $debug );
+	return @_ . '';
+}
+
 # END
 1;