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# this filter is used to find narrower terms in thesaurus which has |
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# only broader terms defined |
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# |
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# it's general purpose memory lookup filter actually with following |
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# sintax: |
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# |
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# prefix syntax before key value is arbitrary. I use here "d" to denote |
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# display value and "a" to denote array (although they are stored the |
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# same: as array with one or more elements) |
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# |
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# store operations: |
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# key: d900, val: 250 (what to display) |
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# <isis filter="mem_lookup">d900 => 250</isis> |
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# key: a4611, val: 900 (parent fields has childs) |
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# <isis filter="mem_lookup">a4611 => 900</isis> |
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# |
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# lookup: |
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# key: a900 (lookup array, delimited by delimiters in one line) |
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# <isis filter="mem_lookup" type="display">[a900]</isis> |
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# |
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# - each key can have more than one value |
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# - storing something into lookup WON'T return any value to |
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# indexer, so it's save to leave type="" undefiend |
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# - lookup will (of course) return one or more values |
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|
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sub mem_lookup { |
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my @out; |
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foreach (@_) { |
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if (/^(.+)\s=>\s(.+)$/) { |
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my ($k,$v) = ($1,$2); |
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# store in array if it doesn't exist |
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if (! grep(/^$v$/, @{$main::cache->{mem_lookup}->{$k}})) { |
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push @{$main::cache->{mem_lookup}->{$k}}, $v; |
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#print STDERR "## mem_lookup store: $k => $v [",join("|",@{$main::cache->{mem_lookup}->{$k}}),"]\n"; |
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} |
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} elsif (/\[[^\[\]]+\]/) { |
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# lookup [key] recursivly |
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my @in = ( $_ ); |
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#print STDERR "mem_lookup: $_\n"; |
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while (my $f = shift @in) { |
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if ($f =~ /\[([^\[\]]+)\]/) { |
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my $k = $1; |
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if ($main::cache->{mem_lookup}->{$k}) { |
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#print STDERR "mem_lookup key: $k = "; |
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foreach my $nv (@{$main::cache->{mem_lookup}->{$k}}) { |
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#print STDERR "\t$nv\n"; |
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my $tmp = $f; |
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$tmp =~ s/\[$k\]/$nv/g; |
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push @in, $tmp; |
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} |
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} else { |
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undef $f; |
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} |
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} elsif ($f) { |
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push @out, $f; |
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} |
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} |
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} else { |
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# value is undef |
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#warn "mem_lookup: invalid filter specification: '$_'"; |
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} |
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} |
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#print STDERR "mem_lookup dump: ",Dumper($main::cache->{mem_lookup}),"\n"; |
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#print STDERR "out: ".Dumper(@out)."\n" if (@out); |
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return @out; |
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} |
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|
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1; |