/[webpac]/trunk/filter/mem_lookup.pm
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Contents of /trunk/filter/mem_lookup.pm

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Revision 351 - (show annotations)
Tue Jun 15 22:14:41 2004 UTC (17 years, 11 months ago) by dpavlin
File size: 2052 byte(s)
back-ported unlimited recursive mem_lookup from webpac v2.
Now you can say something like [[[900]]] and it will produce
tripple lookup (as opposed to double which was maximum in old
version).

1 # this filter is used to find narrower terms in thesaurus which has
2 # only broader terms defined
3 #
4 # it's general purpose memory lookup filter actually with following
5 # sintax:
6 #
7 # prefix syntax before key value is arbitrary. I use here "d" to denote
8 # display value and "a" to denote array (although they are stored the
9 # same: as array with one or more elements)
10 #
11 # store operations:
12 # key: d900, val: 250 (what to display)
13 # <isis filter="mem_lookup">d900 => 250</isis>
14 # key: a4611, val: 900 (parent fields has childs)
15 # <isis filter="mem_lookup">a4611 => 900</isis>
16 #
17 # lookup:
18 # key: a900 (lookup array, delimited by delimiters in one line)
19 # <isis filter="mem_lookup" type="display">[a900]</isis>
20 #
21 # - each key can have more than one value
22 # - storing something into lookup WON'T return any value to
23 # indexer, so it's save to leave type="" undefiend
24 # - lookup will (of course) return one or more values
25
26 sub mem_lookup {
27 my @out;
28 foreach (@_) {
29 if (/^(.+)\s=>\s(.+)$/) {
30 my ($k,$v) = ($1,$2);
31 # store in array if it doesn't exist
32 if (! grep(/^$v$/, @{$main::cache->{mem_lookup}->{$k}})) {
33 push @{$main::cache->{mem_lookup}->{$k}}, $v;
34 #print STDERR "## mem_lookup store: $k => $v [",join("|",@{$main::cache->{mem_lookup}->{$k}}),"]\n";
35 }
36 } elsif (/\[[^\[\]]+\]/) {
37 # lookup [key] recursivly
38 my @in = ( $_ );
39 #print STDERR "mem_lookup: $_\n";
40 while (my $f = shift @in) {
41 if ($f =~ /\[([^\[\]]+)\]/) {
42 my $k = $1;
43 if ($main::cache->{mem_lookup}->{$k}) {
44 #print STDERR "mem_lookup key: $k = ";
45 foreach my $nv (@{$main::cache->{mem_lookup}->{$k}}) {
46 #print STDERR "\t$nv\n";
47 my $tmp = $f;
48 $tmp =~ s/\[$k\]/$nv/g;
49 push @in, $tmp;
50 }
51 } else {
52 undef $f;
53 }
54 } elsif ($f) {
55 push @out, $f;
56 }
57 }
58 } else {
59 # value is undef
60 #warn "mem_lookup: invalid filter specification: '$_'";
61 }
62 }
63 #print STDERR "mem_lookup dump: ",Dumper($main::cache->{mem_lookup}),"\n";
64 #print STDERR "out: ".Dumper(@out)."\n" if (@out);
65 return @out;
66 }
67
68 1;

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