/[webpac]/branches/lezbib/filter/mem_lookup.pm
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Annotation of /branches/lezbib/filter/mem_lookup.pm

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Revision 458 - (hide annotations)
Tue Sep 21 16:53:44 2004 UTC (15 years, 4 months ago) by dpavlin
File size: 2774 byte(s)
update branches with bugfixes from HEAD

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 dpavlin 458 use warnings;
27     use strict;
28    
29 dpavlin 205 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 dpavlin 207 #print STDERR "## mem_lookup store: $k => $v [",join("|",@{$main::cache->{mem_lookup}->{$k}}),"]\n";
38 dpavlin 205 }
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 dpavlin 207 #print STDERR "## mem_lookup fetch keys $pre|$prek|$k|$postk|$post == [".join("|",@keys)."]\n";
45 dpavlin 205 foreach my $k2 (@keys) {
46 dpavlin 207 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 dpavlin 205 }
54     }
55     }
56 dpavlin 207 #print STDERR "## mem_lookup return values $pre\[$prek\[$k\]$postk\]$post == [".join("|",@out)."]\n";
57 dpavlin 205
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 dpavlin 458 foreach my $v (@{$main::cache->{mem_lookup}->{$k}}) {
65 dpavlin 205 push @out,$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 dpavlin 207 #print STDERR "out: ".Dumper(@out)."\n" if (@out);
77 dpavlin 458 return wantarray ? @out : shift @out;
78 dpavlin 205 }
79    
80     1;

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