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package WebPAC::Lookup; |
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|
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use warnings; |
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use strict; |
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|
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use WebPAC::Common; |
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|
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use base qw/WebPAC::Common/; |
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use File::Slurp; |
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use Data::Dumper; |
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|
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my $LOOKUP_REGEX = 'lookup{[^\{\}]+}'; |
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my $LOOKUP_REGEX_SAVE = 'lookup{([^\{\}]+)}'; |
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|
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=head1 NAME |
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|
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WebPAC::Lookup - simple normalisation plugin to produce lookup |
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|
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=head1 VERSION |
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|
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Version 0.01 |
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|
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=cut |
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|
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our $VERSION = '0.01'; |
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|
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=head1 SYNOPSIS |
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|
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This module will produce in-memory lookups for easy resolution of lookups |
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to different records in source files. This will enable you to resolve |
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relational data in source format. |
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|
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It can also be use with C<WebPAC::Tree> to produce tree hierarchies. |
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|
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Lookups are defined in C<conf/lookup/isis.pm>. |
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|
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C<lookup> argument is an array of lookups to create. Each lookup must have C<key> and |
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C<val>. Optional parametar C<eval> is perl code to evaluate before storing |
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value in lookup. |
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|
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@lookup = [ |
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{ 'key' => 'd:v900', 'val' => 'v250^a' }, |
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{ 'eval' => '"v901^a" eq "Podruèje"', |
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'key' => 'pa:v561^4:v562^4:v461^1', |
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'val' => 'v900' }, |
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]; |
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|
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|
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=head1 FUNCTIONS |
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|
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=head2 new |
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|
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Create new lookup object. |
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|
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my $lookup = new WebPAC::Lookup( |
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lookup_file => '/path/to/conf/lookup/lookup.pm', |
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); |
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|
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=cut |
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|
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sub new { |
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my $class = shift; |
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my $self = {@_}; |
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bless($self, $class); |
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|
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my $log = $self->_get_logger(); |
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|
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my $lookup_file = $self->{'lookup_file'} || $log->logconfess("need path to lookup file in lookup_file parametar"); |
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|
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my $lookup_code = read_file($lookup_file) || $log->logconfess("can't read lookup file $lookup_file: $!"); |
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|
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{ |
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no strict 'vars'; |
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do $lookup_file or $log->logdie("Failed to read configuration parameters '$lookup_file' $! $@"); |
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$self->{'lookup_def'} = \@lookup || $log->logdie("lookup config $lookup_file doesn't produce \@lookup array"); |
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} |
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|
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$log->logconfess("lookup config file isn't ARRAY", sub { Dumper( $self->{'lookup_def'} ) }) if ($self->{'lookup_def'} !~ /ARRAY/o); |
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|
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$self ? return $self : return undef; |
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} |
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|
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=head2 add |
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|
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Create lookup from record using lookup definition. |
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|
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$self->add($rec); |
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|
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Returns true if this record produced lookup. |
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|
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=cut |
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|
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sub add($) { |
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my $self = shift; |
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|
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my $log = $self->_get_logger(); |
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|
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my $rec = shift || $log->logconfess("need record to create lookup"); |
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$log->logconfess("need HASH as first argument!") if ($rec !~ /HASH/o); |
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$log->logconfess("need HASH as first argument!") if ($self->{'lookup_def'} !~ /ARRAY/o); |
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|
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my $n = 0; |
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|
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foreach my $i (@{ $self->{'lookup_def'} }) { |
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$log->logconfess("need key") unless defined($i->{'key'}); |
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$log->logconfess("need val") unless defined($i->{'val'}); |
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|
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$n++; |
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|
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if (defined($i->{'eval'})) { |
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# eval first, so we can skip fill_in for key and val |
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my $eval = $self->fill_in($rec,$i->{'eval'}) || next; |
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if ($self->_eval($eval)) { |
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my $key = $self->fill_in($rec,$i->{'key'}) || next; |
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my @val = $self->fill_in($rec,$i->{'val'}) || next; |
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$log->debug("stored $key = ",sub { join(" | ",@val) }); |
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push @{$self->{'lookup'}->{$key}}, @val; |
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} |
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} else { |
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my $key = $self->fill_in($rec,$i->{'key'}) || next; |
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my @val = $self->fill_in($rec,$i->{'val'}) || next; |
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$log->debug("stored $key = ",sub { join(" | ",@val) }); |
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push @{$self->{'lookup'}->{$key}}, @val; |
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} |
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} |
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|
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return $n; |
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} |
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|
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=head2 lookup |
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|
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Perform lookups on format supplied to it. |
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|
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my $text = $lookup->lookup('[v900]'); |
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|
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Lookups can be nested (like C<[d:[a:[v900]]]>). |
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|
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=cut |
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|
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sub lookup { |
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my $self = shift; |
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|
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my $log = $self->_get_logger(); |
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|
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my $tmp = shift || $log->logconfess("need format"); |
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|
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if ($tmp =~ /$LOOKUP_REGEX/o) { |
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my @in = ( $tmp ); |
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|
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$log->debug("lookup for: ",$tmp); |
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|
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my @out; |
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while (my $f = shift @in) { |
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if ($f =~ /$LOOKUP_REGEX_SAVE/o) { |
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my $k = $1; |
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if ($self->{'lookup'}->{$k}) { |
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foreach my $nv (@{$self->{'lookup'}->{$k}}) { |
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my $tmp2 = $f; |
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$tmp2 =~ s/lookup{$k}/$nv/g; |
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push @in, $tmp2; |
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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, $f; |
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} |
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} |
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$log->logconfess("return is array and it's not expected!") unless wantarray; |
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return @out; |
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} else { |
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return $tmp; |
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} |
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} |
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|
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=head1 AUTHOR |
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|
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Dobrica Pavlinusic, C<< <dpavlin@rot13.org> >> |
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|
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=head1 COPYRIGHT & LICENSE |
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|
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Copyright 2005 Dobrica Pavlinusic, All Rights Reserved. |
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This program is free software; you can redistribute it and/or modify it |
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under the same terms as Perl itself. |
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|
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=cut |
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|
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1; # End of WebPAC::Lookup |
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