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

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Revision 205 - (hide annotations)
Sun Jan 18 21:11:39 2004 UTC (20 years, 2 months ago) by dpavlin
File size: 2442 byte(s)
support for unrolling thesaurus entries which have data only about parent
term, so that we can display child terms for each entry

1 dpavlin 205 # 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\n";
35     }
36     } elsif (/^(.*)\[([^\[]*)\[([^\[\]]+)\]([^\]]*)\](.*)$/) {
37     # indirect lookup [prefix[key]suffix]
38     my ($pre,$prek,$k,$postk,$post) = ($1,$2,$3,$4,$5);
39     if ($main::cache->{mem_lookup}->{$k}) {
40     my @keys = @{$main::cache->{mem_lookup}->{$k}};
41     #print STDERR "## mem_lookup fetch keys $k == ".join("|",@keys)."\n";
42     foreach my $k2 (@keys) {
43     if ($main::cache->{mem_lookup}->{$prek.$k2.$postk}) {
44     foreach my $v (@{$main::cache->{mem_lookup}->{$prek.$k2.$postk}}) {
45     push @out,$pre.$v.$post;
46     }
47     }
48     }
49     #print STDERR "## mem_lookup return values $k == ".join("|",@out)."\n";
50    
51     }
52     } elsif (/^(.*)\[([^\[\]]+)\](.*)$/) {
53     # direct lookup [key]
54     my ($pre,$k,$post) = ($1,$2,$3);
55     if ($main::cache->{mem_lookup}->{$k}) {
56     #print STDERR "## mem_lookup fetch $k == ".join("|",@{$main::cache->{mem_lookup}->{$k}})."\n";
57     foreach my $v (@{$main::cache->{mem_lookup}->{$k2}}) {
58     push @out,$pre.$v.$post;
59     }
60     }
61     #print STDERR "## mem_lookup return values $k == ".join("|",@out)."\n";
62    
63     } else {
64     # value is undef
65     #warn "mem_lookup: invalid filter specification: '$_'";
66     }
67     }
68     #print STDERR "mem_lookup dump: ",Dumper($main::cache->{mem_lookup}),"\n";
69     return @out;
70     }
71    
72     1;

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