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\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; |