--- trunk/lib/WebPAC/Normalize.pm	2006/06/26 16:39:51	536
+++ trunk/lib/WebPAC/Normalize.pm	2009/05/29 20:32:13	1205
@@ -1,31 +1,61 @@
 package WebPAC::Normalize;
 use Exporter 'import';
-@EXPORT = qw/
-	set_rec set_lookup
-	get_ds clean_ds
-	tag search display
+our @EXPORT = qw/
+	_set_ds _set_lookup
+	_set_load_row
+	_get_ds _clean_ds
+	_debug
+	_pack_subfields_hash
+
+	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;
 use strict;
 
 #use base qw/WebPAC::Common/;
-use Data::Dumper;
+use Data::Dump qw/dump/;
+use Carp qw/confess/;
 
-=head1 NAME
+# 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
+/);
 
-WebPAC::Normalize - describe normalisaton rules using sets
+use Storable qw/dclone/;
 
-=head1 VERSION
+=head1 NAME
 
-Version 0.04
+WebPAC::Normalize - describe normalisaton rules using sets
 
 =cut
 
-our $VERSION = '0.04';
+our $VERSION = '0.36';
 
 =head1 SYNOPSIS
 
@@ -38,89 +68,270 @@
 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> and C<search>.
+types (on the left side of definition) are: C<search_display>, C<display>, C<search> and
+C<marc>.
 
 =head1 FUNCTIONS
 
+Functions which start with C<_> are private and used by WebPAC internally.
+All other functions are available for use within normalisation rules.
+
 =head2 data_structure
 
 Return data structure
 
-  my $ds = WebPAC::Normalize(
-  	lookup => $lookup->lookup_hash,
+  my $ds = WebPAC::Normalize::data_structure(
+	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<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 
+C<WebPAC::Normalize::data_structure>.
+
 =cut
 
+my $load_row_coderef;
+
 sub data_structure {
 	my $arg = {@_};
 
 	die "need row argument" unless ($arg->{row});
 	die "need normalisation argument" unless ($arg->{rules});
 
+	_set_lookup( $arg->{lookup} ) if defined($arg->{lookup});
+	_set_ds( $arg->{row} );
+	_set_config( $arg->{config} ) if defined($arg->{config});
+	_clean_ds( %{ $arg } );
+	$load_row_coderef = $arg->{load_row_coderef};
+
 	no strict 'subs';
-	set_lookup( $arg->{lookup} );
-	set_rec( $arg->{row} );
-	clean_ds();
-	eval "$arg->{rules}";
+	no warnings 'redefine';
+	eval "$arg->{rules};";
 	die "error evaling $arg->{rules}: $@\n" if ($@);
-	return get_ds();
+
+	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 tag
+=head2
 
-Define new tag for I<search> and I<display>.
+  my $rec = _get_rec();
 
-  tag('Title', rec('200','a') );
+=cut
 
+sub _get_rec { $rec };
+
+sub rec_array {
+	my $d = $rec->{ $_[0] };
+	return @$d if ref($d) eq 'ARRAY';
+	die "field $_[0] not array: ",dump( $d );
+}
+
+=head2 _set_config
+
+Set current config hash
+
+  _set_config( $config );
+
+Magic keys are:
+
+=over 4
+
+=item _
+
+Code of current database
+
+=item _mfn
+
+Current MFN
+
+=back
+
+=cut
+
+my $config;
+
+sub _set_config {
+	$config = shift;
+}
+
+=head2 _get_ds
+
+Return hash formatted as data structure
+
+  my $ds = _get_ds();
 
 =cut
 
 my $out;
 
-sub tag {
-	my $name = shift or die "tag needs name as first argument";
+sub _get_ds {
+#warn "## out = ",dump($out);
+	return $out;
+}
+
+=head2 _clean_ds
+
+Clean data structure hash for next record
+
+  _clean_ds();
+
+=cut
+
+sub _clean_ds {
+	my $a = {@_};
+	$out = undef;
+	WebPAC::Normalize::MARC::_clean();
+}
+
+=head2 _set_lookup
+
+Set current lookup hash
+
+  _set_lookup( $lookup );
+
+=cut
+
+my $lookup;
+
+sub _set_lookup {
+	$lookup = shift;
+}
+
+=head2 _get_lookup
+
+Get current lookup hash
+
+  my $lookup = _get_lookup();
+
+=cut
+
+sub _get_lookup {
+	return $lookup;
+}
+
+=head2 _set_load_row
+
+Setup code reference which will return L<data_structure> from
+L<WebPAC::Store>
+
+  _set_load_row(sub {
+		my ($database,$input,$mfn) = @_;
+		$store->load_row( database => $database, input => $input, id => $mfn );
+  });
+
+=cut
+
+sub _set_load_row {
+	my $coderef = shift;
+	confess "argument isn't CODE" unless ref($coderef) eq 'CODE';
+
+	$load_row_coderef = $coderef;
+}
+
+=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;
+	$WebPAC::Normalize::MARC::debug = $debug;
+}
+
+=head1 Functions to create C<data_structure>
+
+Those functions generally have to first in your normalization file.
+
+=head2 to
+
+Generic way to set values for some name
+
+  to('field-name', 'name-value' => rec('200','a') );
+
+There are many helpers defined below which might be easier to use.
+
+=cut
+
+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') );
+  search_display('Title', rec('200','a') );
 
 =cut
 
-sub display {
-	my $name = shift or die "display 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 tag
+
+Old name for L<search_display>, it will probably be removed at one point.
+
+=cut
+
+sub tag {
+	search_display( @_ );
+}
+
+=head2 display
+
+Define output just for I<display>
+
+  @v = display('Title', rec('200','a') );
+
+=cut
+
+sub display { to( 'display', @_ ) }
+
 =head2 search
 
 Prepare values just for I<search>
@@ -129,50 +340,99 @@
 
 =cut
 
-sub search {
-	my $name = shift or die "search needs name as first argument";
-	my @o = grep { defined($_) && $_ ne '' } @_;
-	return unless (@o);
-	$out->{$name}->{tag} = $name;
-	$out->{$name}->{search} = \@o;
-}
+sub search { to( 'search', @_ ) }
 
-=head2 get_ds
+=head2 sorted
 
-Return hash formatted as data structure
+Insert into lists which will be automatically sorted
 
-  my $ds = get_ds();
+ sorted('Title', rec('200','a') );
 
 =cut
 
-sub get_ds {
-	return $out;
-}
+sub sorted { to( 'sorted', @_ ) }
 
-=head2 clean_ds
+=head2 row
 
-Clean data structure hash for next record
+Insert new row of data into output module
 
-  clean_ds();
+  row( column => 'foo', column2 => 'bar' );
 
 =cut
 
-sub clean_ds {
-	$out = undef;
+use Data::Dump qw/dump/;
+
+sub row {
+	die "array doesn't have even number of elements but $#_: ",dump( @_ ) if $#_ % 2 != 1;
+
+	push @{ $out->{'_rows'} }, {@_};
 }
 
-=head2 set_lookup
 
-Set current lookup hash
+=head1 Functions to extract data from input
+
+This function should be used inside functions to create C<data_structure> described
+above.
+
+=head2 _pack_subfields_hash
+
+ @subfields = _pack_subfields_hash( $h );
+ $subfields = _pack_subfields_hash( $h, 1 );
 
-  set_lookup( $lookup );
+Return each subfield value in array or pack them all together and return scalar
+with subfields (denoted by C<^>) and values.
 
 =cut
 
-my $lookup;
+sub _pack_subfields_hash {
 
-sub set_lookup {
-	$lookup = shift;
+	warn "## _pack_subfields_hash( ",dump(@_), " )\n" if ($debug > 1);
+
+	my ($hash,$include_subfields) = @_;
+
+	# sanity and ease of use
+	return $hash if (ref($hash) ne 'HASH');
+
+	my $h = dclone( $hash );
+
+	if ( defined($h->{subfields}) ) {
+		my $sfs = delete $h->{subfields} || die "no subfields?";
+		my @out;
+		while (@$sfs) {
+			my $sf = shift @$sfs;
+			push @out, '^' . $sf if ($include_subfields);
+			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";
+
+				push @out, $h->{$sf};
+			} else {
+#warn "====> $sf $o / $#$sfs ", dump( $sfs, $h->{$sf} ), "\n";
+				push @out, $h->{$sf}->[$o];
+			}
+		}
+		if ($include_subfields) {
+			return join('', @out);
+		} else {
+			return @out;
+		}
+	} else {
+		if ($include_subfields) {
+			my $out = '';
+			foreach my $sf (sort keys %$h) {
+				if (ref($h->{$sf}) eq 'ARRAY') {
+					$out .= '^' . $sf . join('^' . $sf, @{ $h->{$sf} });
+				} else {
+					$out .= '^' . $sf . $h->{$sf};
+				}
+			}
+			return $out;
+		} else {
+			# FIXME this should probably be in alphabetical order instead of hash order
+			values %{$h};
+		}
+	}
 }
 
 =head2 rec1
@@ -187,15 +447,19 @@
 
 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($_) eq 'HASH') {
-				values %{$_};
+		my @out;
+		foreach my $h ( @{ $rec->{$f} } ) {
+			if (ref($h) eq 'HASH') {
+				push @out, ( _pack_subfields_hash( $h ) );
 			} else {
-				$_;
+				push @out, $h;
 			}
-		} @{ $rec->{$f} };
+		}
+		return @out;
 	} elsif( defined($rec->{$f}) ) {
 		return $rec->{$f};
 	}
@@ -213,7 +477,14 @@
 	my $f = shift;
 	return unless (defined($rec && $rec->{$f}));
 	my $sf = shift;
-	return map { $_->{$sf} } grep { ref($_) eq 'HASH' && $_->{$sf} } @{ $rec->{$f} };
+	warn "rec2($f,$sf) = ", dump( $rec->{$f} ), $/ if ($debug > 1);
+	return map {
+		if (ref($_->{$sf}) eq 'ARRAY') {
+			@{ $_->{$sf} };
+		} else {
+			$_->{$sf};
+		}
+	} grep { ref($_) eq 'HASH' && defined $_->{$sf} } @{ $rec->{$f} };
 }
 
 =head2 rec
@@ -223,16 +494,75 @@
   @v = rec('200')
   @v = rec('200','a')
 
+If rec() returns just single value, it will
+return scalar, not array.
+
 =cut
 
 sub rec {
+	my @out;
 	if ($#_ == 0) {
-		return rec1(@_);
+		@out = rec1(@_);
 	} elsif ($#_ == 1) {
-		return rec2(@_);
+		@out = rec2(@_);
+	}
+	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
@@ -244,7 +574,7 @@
 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";
@@ -262,7 +592,8 @@
 =cut
 
 sub prefix {
-	my $p = shift or die "prefix needs string as first argument";
+	my $p = shift;
+	return @_ unless defined( $p );
 	return map { $p . $_ } grep { defined($_) } @_;
 }
 
@@ -275,7 +606,8 @@
 =cut
 
 sub suffix {
-	my $s = shift or die "suffix needs string as first argument";
+	my $s = shift;
+	return @_ unless defined( $s );
 	return map { $_ . $s } grep { defined($_) } @_;
 }
 
@@ -288,8 +620,10 @@
 =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 . $_ . $s } grep { defined($_) } @_;
 }
 
@@ -310,19 +644,221 @@
 
 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 @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>
+
+  # return database code (key under databases in yaml)
+  $database_code = config();	# use _ from hash
+  $database_name = config('name');
+  $database_input_name = config('input name');
+
+Up to three levels are supported.
+
+=cut
+
+sub config {
+	return unless ($config);
+
+	my $p = shift;
+
+	$p ||= '';
+
+	my $v;
+
+	warn "### getting config($p)\n" if ($debug > 1);
+
+	my @p = split(/\s+/,$p);
+	if ($#p < 0) {
+		$v = $config->{ '_' };	# special, database code
 	} else {
-		return $lookup->{$k};
+
+		my $c = dclone( $config );
+
+		foreach my $k (@p) {
+			warn "### k: $k c = ",dump($c),$/ if ($debug > 1);
+			if (ref($c) eq 'ARRAY') {
+				$c = shift @$c;
+				warn "config($p) taking first occurence of '$k', probably not what you wanted!\n";
+				last;
+			}
+
+			if (! defined($c->{$k}) ) {
+				$c = undef;
+				last;
+			} else {
+				$c = $c->{$k};
+			}
+		}
+		$v = $c if ($c);
+
 	}
+
+	warn "## config( '$p' ) = ",dump( $v ),$/ if ($v && $debug);
+	warn "config( '$p' ) is empty\n" if (! $v);
+
+	return $v;
+}
+
+=head2 id
+
+Returns unique id of this record
+
+  $id = id();
+
+Returns C<42/2> for 2nd occurence of MFN 42.
+
+=cut
+
+sub id {
+	my $mfn = $config->{_mfn} || die "no _mfn in config data";
+	return $mfn . ( WebPAC::Normalize::MARC::_created_marc_records() || '' );
 }
 
 =head2 join_with
@@ -335,7 +871,86 @@
 
 sub join_with {
 	my $d = shift;
-	return join($d, grep { defined($_) && $_ ne '' } @_);
+	warn "### join_with('$d',",dump(@_),")\n" if ($debug > 2);
+	my $v = join($d, grep { defined($_) && $_ ne '' } @_);
+	return '' unless defined($v);
+	return $v;
+}
+
+=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;
+	}
+}
+
+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