/[webpac]/branches/humanistika/filter/mem_lookup.pm
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Contents of /branches/humanistika/filter/mem_lookup.pm

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Revision 458 - (show annotations)
Tue Sep 21 16:53:44 2004 UTC (15 years, 2 months ago) by dpavlin
File size: 2774 byte(s)
update branches with bugfixes from HEAD

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 use warnings;
27 use strict;
28
29 sub mem_lookup {
30 my @out;
31 foreach (@_) {
32 if (/^(.+)\s=>\s(.+)$/) {
33 my ($k,$v) = ($1,$2);
34 # store in array if it doesn't exist
35 if (! grep(/^$v$/, @{$main::cache->{mem_lookup}->{$k}})) {
36 push @{$main::cache->{mem_lookup}->{$k}}, $v;
37 #print STDERR "## mem_lookup store: $k => $v [",join("|",@{$main::cache->{mem_lookup}->{$k}}),"]\n";
38 }
39 } elsif (/^(.*)\[([^\[]*)\[([^\[\]]+)\]([^\]]*)\](.*)$/) {
40 # indirect lookup [prefix[key]suffix]
41 my ($pre,$prek,$k,$postk,$post) = ($1,$2,$3,$4,$5);
42 if ($main::cache->{mem_lookup}->{$k}) {
43 my @keys = @{$main::cache->{mem_lookup}->{$k}};
44 #print STDERR "## mem_lookup fetch keys $pre|$prek|$k|$postk|$post == [".join("|",@keys)."]\n";
45 foreach my $k2 (@keys) {
46 my $full_k = $prek.$k2.$postk;
47 if ($main::cache->{mem_lookup}->{$full_k}) {
48 foreach my $v (@{$main::cache->{mem_lookup}->{$full_k}}) {
49 my ($pret,$postt) = ($pre,$post);
50 $pret=~s/\[$k\]/$k2/g;
51 $postt=~s/\[$k\]/$k2/g;
52 push @out,$pret.$v.$postt;
53 }
54 }
55 }
56 #print STDERR "## mem_lookup return values $pre\[$prek\[$k\]$postk\]$post == [".join("|",@out)."]\n";
57
58 }
59 } elsif (/^(.*)\[([^\[\]]+)\](.*)$/) {
60 # direct lookup [key]
61 my ($pre,$k,$post) = ($1,$2,$3);
62 if ($main::cache->{mem_lookup}->{$k}) {
63 #print STDERR "## mem_lookup fetch $k == ".join("|",@{$main::cache->{mem_lookup}->{$k}})."\n";
64 foreach my $v (@{$main::cache->{mem_lookup}->{$k}}) {
65 push @out,$pre.$v.$post;
66 }
67 }
68 #print STDERR "## mem_lookup return values $k == ".join("|",@out)."\n";
69
70 } else {
71 # value is undef
72 #warn "mem_lookup: invalid filter specification: '$_'";
73 }
74 }
75 #print STDERR "mem_lookup dump: ",Dumper($main::cache->{mem_lookup}),"\n";
76 #print STDERR "out: ".Dumper(@out)."\n" if (@out);
77 return wantarray ? @out : shift @out;
78 }
79
80 1;

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