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package WebPAC; |
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use Carp; |
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use Text::Iconv; |
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use Config::IniFiles; |
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use Data::Dumper; |
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=head1 NAME |
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WebPAC - base class for WebPAC |
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=head1 DESCRIPTION |
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This module implements methods used by WebPAC. |
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=head1 METHODS |
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=head2 new |
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This will create new instance of WebPAC using configuration specified by C<config_file>. |
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my $webpac = new WebPAC( |
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config_file => 'name.conf', |
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[code_page => 'ISO-8859-2',] |
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); |
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Default C<code_page> is C<ISO-8859-2>. |
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It will also read configuration files |
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C<global.conf> (used by indexer and Web font-end) |
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and configuration file specified by C<config_file> |
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which describes databases to be indexed. |
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=cut |
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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, $class); |
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# fill in default values |
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# output codepage |
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$self->{'code_page'} = 'ISO-8859-2' if (! $self->{'code_page'}); |
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# |
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# read global.conf |
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# |
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$self->{global_config_file} = new Config::IniFiles( -file => 'global.conf' ) || croak "can't open 'global.conf'"; |
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# read global config parametars |
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foreach my $var (qw( |
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dbi_dbd |
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dbi_dsn |
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dbi_user |
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dbi_passwd |
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show_progress |
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my_unac_filter |
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)) { |
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$self->{global_config}->{$var} = $self->{global_config_file}->val('global', $var); |
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} |
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# |
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# read indexer config file |
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# |
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$self->{indexer_config_file} = new Config::IniFiles( -file => $self->{config_file} ) || croak "can't open '$self->{config_file}'"; |
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# read global config parametars |
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foreach my $var (qw( |
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dbi_dbd |
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dbi_dsn |
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dbi_user |
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dbi_passwd |
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show_progress |
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my_unac_filter |
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)) { |
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$self->{global_config}->{$var} = $self->{global_config_file}->val('global', $var); |
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} |
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return $self; |
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} |
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=head2 open_isis |
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Open CDS/ISIS database using OpenIsis module and read all records to memory. |
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$webpac->open_isis( |
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filename => '/data/ISIS/ISIS', |
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code_page => '852', |
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limit_mfn => '500', |
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lookup => [ ... ], |
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); |
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By default, ISIS code page is assumed to be C<852>. |
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If optional parametar C<limit_mfn> is set, it will read just 500 records |
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from database in example above. |
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Returns number of last record read into memory (size of database, really). |
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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 index. |
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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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=cut |
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sub open_isis { |
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my $self = shift; |
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my $arg = {@_}; |
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croak "need filename" if (! $arg->{'filename'}); |
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my $code_page = $arg->{'code_page'} || '852'; |
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use OpenIsis; |
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#$self->{'isis_code_page'} = $code_page; |
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# create Text::Iconv object |
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my $cp = Text::Iconv->new($code_page,$self->{'code_page'}); |
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my $isis_db = OpenIsis::open($arg->{'filename'}); |
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my $maxmfn = OpenIsis::maxRowid( $isis_db ) || 1; |
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$maxmfn = $self->{limit_mfn} if ($self->{limit_mfn}); |
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# read database |
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for (my $mfn = 1; $mfn <= $maxmfn; $mfn++) { |
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# read record |
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my $row = OpenIsis::read( $isis_db, $mfn ); |
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foreach my $k (keys %{$row}) { |
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if ($k ne "mfn") { |
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foreach my $l (@{$row->{$k}}) { |
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$l = $cp->convert($l); |
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# has subfields? |
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my $val; |
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if ($l =~ m/\^/) { |
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foreach my $t (split(/\^/,$l)) { |
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next if (! $t); |
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$val->{substr($t,0,1)} = substr($t,1); |
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} |
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} else { |
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$val = $l; |
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} |
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push @{$self->{'data'}->{$mfn}->{$k}}, $val; |
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} |
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} |
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} |
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# create lookup |
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my $rec = $self->{'data'}->{$mfn}; |
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$self->create_lookup($rec, @{$arg->{'lookup'}}); |
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} |
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# store max mfn and return it. |
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return $self->{'max_mfn'} = $maxmfn; |
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} |
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=head2 create_lookup |
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Create lookup from record using lookup definition. |
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=cut |
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sub create_lookup { |
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my $self = shift; |
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my $rec = shift || confess "need record to create lookup"; |
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confess("need HASH as first argument!") if ($rec !~ /HASH/o); |
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foreach my $i (@_) { |
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if ($i->{'eval'}) { |
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my $eval = $self->fill_in($rec,$i->{'eval'}); |
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my $key = $self->fill_in($rec,$i->{'key'}); |
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my @val = $self->fill_in($rec,$i->{'val'}); |
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if ($key && @val && eval $eval) { |
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push @{$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'}); |
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my @val = $self->fill_in($rec,$i->{'val'}); |
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if ($key && @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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} |
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=head2 get_data |
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Returns value from record. |
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$self->get_data(\$rec,$f,$sf,$i,\$found); |
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Arguments are: |
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record reference C<$rec>, |
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field C<$f>, |
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optional subfiled C<$sf>, |
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index for repeatable values C<$i>. |
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Optinal variable C<$found> will be incremeted if thre |
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is field. |
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Returns value or empty string. |
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=cut |
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sub get_data { |
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my $self = shift; |
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my ($rec,$f,$sf,$i,$found) = @_; |
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if ($$rec->{$f}) { |
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if ($sf && $$rec->{$f}->[$i]->{$sf}) { |
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$$found++ if (defined($$found)); |
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return $$rec->{$f}->[$i]->{$sf}; |
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} elsif ($$rec->{$f}->[$i]) { |
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$$found++ if (defined($$found)); |
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return $$rec->{$f}->[$i]; |
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} |
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} else { |
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return ''; |
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} |
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} |
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=head2 fill_in |
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Workhourse of all: takes record from in-memory structure of database and |
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strings with placeholders and returns string or array of with substituted |
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values from record. |
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$webpac->fill_in($rec,'v250^a'); |
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Optional argument is ordinal number for repeatable fields. By default, |
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it's assume to be first repeatable field (fields are perl array, so first |
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element is 0). |
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Following example will read second value from repeatable field. |
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$webpac->fill_in($rec,'Title: v250^a',1); |
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This function B<does not> perform parsing of format to inteligenty skip |
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delimiters before fields which aren't used. |
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=cut |
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sub fill_in { |
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my $self = shift; |
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my $rec = shift || confess "need data record"; |
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my $format = shift || confess "need format to parse"; |
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# iteration (for repeatable fields) |
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my $i = shift || 0; |
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# FIXME remove for speedup? |
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confess("need HASH as first argument!") if ($rec !~ /HASH/o); |
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my $found = 0; |
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my $eval_code; |
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# remove eval{...} from beginning |
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$eval_code = $1 if ($format =~ s/^eval{([^}]+)}//s); |
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# do actual replacement of placeholders |
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$format =~ s/v(\d+)(?:\^(\w))*/$self->get_data(\$rec,$1,$2,$i,\$found)/ges; |
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if ($found) { |
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if ($eval_code) { |
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my $eval = $self->fill_in($rec,$eval_code,$i); |
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return if (! eval $eval); |
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} |
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# do we have lookups? |
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if ($format =~ /\[[^\[\]]+\]/o) { |
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return $self->lookup($format); |
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} else { |
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return $format; |
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} |
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} else { |
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return; |
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} |
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} |
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=head2 lookup |
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Perform lookups on format supplied to it. |
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my $txt = $self->lookup('[v900]'); |
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Lookups can be nested (like C<[d:[a:[v900]]]>). |
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=cut |
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sub lookup { |
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my $self = shift; |
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my $tmp = shift || confess "need format"; |
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if ($tmp =~ /\[[^\[\]]+\]/o) { |
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my @in = ( $tmp ); |
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#print "##lookup $tmp\n"; |
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my @out; |
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while (my $f = shift @in) { |
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if ($f =~ /\[([^\[\]]+)\]/) { |
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my $k = $1; |
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if ($self->{'lookup'}->{$k}) { |
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#print "## lookup key = $k\n"; |
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foreach my $nv (@{$self->{'lookup'}->{$k}}) { |
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my $tmp2 = $f; |
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$tmp2 =~ s/\[$k\]/$nv/g; |
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push @in, $tmp2; |
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#print "## lookup in => $tmp2\n"; |
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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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#print "## lookup out => $f\n"; |
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} |
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} |
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return @out; |
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} else { |
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return $tmp; |
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} |
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} |
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=head2 parse |
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Perform smart parsing of string, skipping delimiters for fields which aren't |
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defined. It can also eval code in format starting with C<eval{...}> and |
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return output or nothing depending on eval code. |
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$webpac->parse($rec,'eval{"v901^a" eq "Deskriptor"}descriptor: v250^a', $i); |
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=cut |
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sub parse { |
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my $self = shift; |
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my ($rec, $format, $i) = @_; |
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confess("need HASH as first argument!") if ($rec !~ /HASH/o); |
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$i = 0 if (! $i); |
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my @out; |
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my $eval_code; |
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# remove eval{...} from beginning |
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$eval_code = $1 if ($format =~ s/^eval{([^}]+)}//s); |
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my $prefix; |
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my $all_found=0; |
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#print "## $format\n"; |
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while ($format =~ s/^(.*?)v(\d+)(?:\^(\w))*//s) { |
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#print "## [ $1 | $2 | $3 ] $format\n"; |
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my $del = $1 || ''; |
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$prefix ||= $del if ($all_found == 0); |
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my $found = 0; |
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my $tmp = $self->get_data(\$rec,$2,$3,$i,\$found); |
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if ($found) { |
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push @out, $del; |
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push @out, $tmp; |
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$all_found += $found; |
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dpavlin |
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} |
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} |
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dpavlin |
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return if (! $all_found); |
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dpavlin |
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dpavlin |
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my $out = join('',@out) . $format; |
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# add prefix if not there |
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$out = $prefix . $out if ($out !~ m/^\Q$prefix\E/); |
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dpavlin |
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if ($eval_code) { |
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my $eval = $self->fill_in($rec,$eval_code,$i); |
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return if (! eval $eval); |
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} |
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dpavlin |
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return $out; |
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dpavlin |
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} |
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dpavlin |
352 |
1; |