--- trunk/IsisDB.pm	2004/12/29 17:03:52	11
+++ trunk/IsisDB.pm	2004/12/29 20:10:11	12
@@ -7,7 +7,7 @@
 BEGIN {
 	use Exporter ();
 	use vars qw ($VERSION @ISA @EXPORT @EXPORT_OK %EXPORT_TAGS);
-	$VERSION     = 0.03;
+	$VERSION     = 0.04;
 	@ISA         = qw (Exporter);
 	#Give a hoot don't pollute, do not export more than needed by default
 	@EXPORT      = qw ();
@@ -70,8 +70,12 @@
  my $isis = new IsisDB(
  	isisdb => './cds/cds',
 	read_fdt => 1,
-	debug => 1,
 	include_deleted => 1,
+	hash_filter => sub {
+		my $v = shift;
+		$v =~ s#foo#bar#g;
+	},
+	debug => 1,
  );
 
 Options are described below:
@@ -88,14 +92,18 @@
 Boolean flag to specify if field definition table should be read. It's off
 by default.
 
-=item debug
-
-Dump a C<lot> of debugging output.
-
 =item include_deleted
 
 Don't skip logically deleted records in ISIS.
 
+=item hash_filter
+
+Filter code ref which will be used before data is converted to hash.
+
+=item debug
+
+Dump a B<lot> of debugging output.
+
 =back
 
 It will also set C<$isis-E<gt>{'maxmfn'}> which is maximum MFN stored in database.
@@ -109,7 +117,7 @@
 
 	croak "new needs database name (isisdb) as argument!" unless ({@_}->{isisdb});
 
-	foreach my $v (qw{isisdb debug include_deleted}) {
+	foreach my $v (qw{isisdb debug include_deleted hash_filter}) {
 		$self->{$v} = {@_}->{$v};
 	}
 
@@ -223,7 +231,7 @@
   my $rec = $isis->fetch(55);
 
 Returns hash with keys which are field names and values are unpacked values
-for that field.
+for that field (like C<^asometing^bsomething else>)
 
 =cut
 
@@ -378,6 +386,69 @@
 	return $out;
 }
 
+=head2 to_hash
+
+Read mfn and convert it to hash
+
+  my $hash = $isis->to_hash($mfn);
+
+It has ability to convert characters (using C<hash_filter> from ISIS
+database before creating structures enabling character remapping or quick
+fixup of data.
+
+This function returns hash which is like this:
+
+  $hash = {
+    '210' => [
+               {
+                 'c' => 'New York University press',
+                 'a' => 'New York',
+                 'd' => 'cop. 1988'
+               }
+             ],
+    '990' => [
+               '2140',
+               '88',
+               'HAY'
+             ],
+  };
+
+You can later use that has to produce any output from ISIS data.
+
+=cut
+
+sub to_hash {
+	my $self = shift;
+
+	my $mfn = shift || confess "need mfn!";
+
+	my $rec;
+	my $row = $self->fetch($mfn);
+
+	foreach my $k (keys %{$row}) {
+		foreach my $l (@{$row->{$k}}) {
+
+			# filter output
+			$l = $self->{'hash_filter'}->($l) if ($self->{'hash_filter'});
+
+			# has subfields?
+			my $val;
+			if ($l =~ m/\^/) {
+				foreach my $t (split(/\^/,$l)) {
+					next if (! $t);
+					$val->{substr($t,0,1)} = substr($t,1);
+				}
+			} else {
+				$val = $l;
+			}
+
+			push @{$rec->{$k}}, $val;
+		}
+	}
+
+	return $rec;
+}
+
 #
 # XXX porting from php left-over:
 #