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# -*- Mode: Perl -*- |
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# $Basename: Wais.pm $ |
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# $Revision: 1.5 $ |
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# Author : Ulrich Pfeifer |
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# Created On : Mon Sep 16 11:08:04 1996 |
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# Last Modified By: Ulrich Pfeifer |
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# Last Modified On: Sat Apr 15 15:51:49 2000 |
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# Language : CPerl |
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# |
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# (C) Copyright 1997-2000, Ulrich Pfeifer |
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# |
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|
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package WAIT::Wais; |
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|
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require WAIT::Query::Wais; |
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require WAIT::Database; |
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use Fcntl; |
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use strict; |
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use vars qw(%DB %TB); |
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|
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my %FORMATTER; |
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|
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BEGIN { # check for available formatters |
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%FORMATTER = qw(text WAIT::Format::Base); |
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for my $inc (@INC) { |
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if (-d "$inc/WAIT/Format") { |
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for my $format ( <$inc/WAIT/Format/*.pm>) { |
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my ($name) = ($format =~ /(\w+)\.pm$/); |
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my $module = "WAIT::Format::$name"; |
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$name = lc $name; |
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$FORMATTER{$name} = $module; |
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} |
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} |
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} |
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} |
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|
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|
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sub _database { |
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my $path = shift; |
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my ($dir, $dn, $tn) = ($path =~ m:(.*)/([^/]+)/([^/]+)$:); |
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|
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return $DB{"$dir/$dn"} if exists $DB{"$dir/$dn"}; |
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$DB{"$dir/$dn"} = WAIT::Database->open(name => $dn, directory => $dir, |
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mode => O_RDONLY); |
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return $DB{"$dir/$dn"}; |
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} |
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|
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sub _table { |
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my $path = shift; |
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|
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return $TB{$path} if exists $TB{$path}; |
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my $db = _database($path); |
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my ($dir, $dn, $tn) = ($path =~ m:(.*)/([^/]+)/([^/]+)$:); |
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$TB{$path} = $db->table(name => $tn); |
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$TB{$path}; |
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} |
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|
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sub Search { |
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my (@requests) = @_; |
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my $request; |
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my $result = new WAIT::Wais::Result; |
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for $request (@requests) { |
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my $query = $request->{'query'}; |
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my $database = $request->{'database'}; |
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my $tag = $request->{'tag'} || $request->{'database'}; |
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my ($dir, $dn, $tn) = ($database =~ m:(.*)/([^/]+)/([^/]+)$:); |
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my $tb = _table($database); |
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unless (defined $tb) { |
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$result->add(Tag => $tag, Error => 'Could not open database'); |
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return $result; |
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} |
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my $wquery; |
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eval {$wquery = WAIT::Query::Wais::query($tb, $query)}; |
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if ($@ ne '') { |
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$result->add(Tag => $tag, Error => $@); |
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return $result; |
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} |
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my %po = $wquery->execute(); |
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$result->add(Tag => $tag, Database => $database, |
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Table => $tb, Postings => \%po) |
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} |
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$result; |
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} |
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|
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sub Retrieve { |
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my %parm = @_; |
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my $result = new WAIT::Wais::Result; |
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my $tb = _table($parm{database}); |
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|
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unless (defined $tb) { |
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$result->add(Tag => 'document', Error => 'Could not open database'); |
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return $result; |
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} |
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|
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my $did = ref($parm{docid})?$parm{docid}->did:$parm{docid}; |
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|
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my %rec = $tb->fetch($did); |
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|
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# another CPAN hack |
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if ($rec{docid} =~ m(^data/)) { |
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$rec{docid} = $tb->dir . '/' . $rec{docid}; |
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} |
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|
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my $text = $tb->fetch_extern($rec{docid}); |
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|
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my @txt; |
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$tb->open; |
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if ($parm{query}) { |
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@txt = WAIT::Query::Wais::query($tb,$parm{query})->hilight($text); |
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} else { |
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@txt = $tb->layout->tag($text); |
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} |
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|
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if ($parm{lines}) { |
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@txt = filter($parm{lines}, @txt); |
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} |
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|
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my $type = lc $parm{type}; |
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|
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my $module = (exists $FORMATTER{$type})?$FORMATTER{$type}:$FORMATTER{text}; |
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my $path = $module; |
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$path =~ s(::)(/)g; |
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|
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require "$path.pm"; |
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my $format = new $module; |
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$text = $format->as_string(\@txt, sub {$tb->fetch($did)}); |
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$result->add(Tag => 'document', Text => $text); |
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} |
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|
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sub filter { |
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my $filter = shift; |
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my @result; |
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my @context; |
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my $lines = 0; |
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my $clines = 0; |
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my $elipsis = 0; |
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|
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while (@_) { |
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my %tag = %{shift @_}; |
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my $txt = shift @_; |
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|
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for (split /(\n)/, $txt) { |
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if ($_ eq "\n") { |
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if (exists $tag{_qt}) { |
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#die "Weird!"; |
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push @result, {_i=>1}, "[WEIRD]"; |
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} elsif ($lines) { |
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push @result, {}, $_; |
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$lines--; |
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} else { |
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push @context, {}, $_; |
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$clines++; |
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} |
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} else { |
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if (exists $tag{_qt}) { |
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push @result, {_i=>1}, "\n[ $elipsis lines ]\n" if $elipsis; |
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push @result, @context, {%tag}, $_; |
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delete $tag{_qt}; |
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@context = (); $clines = 0; $elipsis=0; |
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$lines = $filter+1; |
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} elsif ($lines) { |
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push @result, \%tag, $_; |
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} else { |
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push @context, \%tag, $_; |
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} |
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} |
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if ($clines>$filter) { |
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my (%tag, $txt); |
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while ($clines>$filter) { |
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%tag = %{shift @context}; |
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$txt = shift @context; |
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if ($txt =~ /\n/) { |
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$clines--; |
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$elipsis++; |
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} |
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} |
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} |
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} |
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} |
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@result; |
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} |
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|
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package WAIT::Wais::Result; |
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|
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sub new { |
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my $type = shift; |
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my %par = @_; |
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my $self = {'header' => [], 'diagnostics' => [], 'text' => ''}; |
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|
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bless $self, $type; |
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} |
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|
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sub _header { |
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my ($database, $did, $score) = @_; |
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my $types; |
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my $tb = WAIT::Wais::_table($database); |
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my %rec = $tb->fetch($did); |
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my $lines = $rec{'lines'} || 0; |
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my $length = $rec{'size'} || 0; |
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unless ($length) { |
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($length) = ($rec{docid} =~ /(\d+)$/) |
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} |
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unless ($rec{docid} =~ m(^/)) { |
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$rec{docid} = $tb->dir . '/' . $rec{docid}; |
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} |
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my $headline = $rec{headline} || ''; |
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if (exists $rec{types}) { |
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$types = [split ',', $rec{types}] |
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} else { |
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$types = [keys %FORMATTER]; |
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} |
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|
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[$score, $lines, $length, $headline, $types, |
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WAIT::Wais::Docid->new('wait',$database, $did)]; |
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} |
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|
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sub add { |
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my $self = shift; |
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my %parm = @_; |
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my $tag = $parm{Tag}; |
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my $docid; |
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|
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if ($parm{Postings}) { |
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my @result; |
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my @left = @{$self->{'header'}}; |
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my @right; |
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for (keys %{$parm{Postings}}) { |
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push @right, _header($parm{Database}, $_, $parm{Postings}->{$_}) |
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} |
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while (($#left >= $[) or ($#right >= $[)) { |
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if ($#left < $[) { |
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for (@right) { |
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push @result, [$tag, @{$_}]; |
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} |
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last; |
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} |
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if ($#right < $[) { |
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push @result, @left; |
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last; |
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} |
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if ($left[0]->[1] > $right[0]->[0]) { |
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push @result, shift @left; |
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} else { |
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push @result, [$tag, @{shift @right}]; |
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} |
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} |
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$self->{'header'} = \@result; |
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} |
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if ($parm{Errors}) { |
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my %diag = %{$parm{Errors}}; |
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for (keys %diag) { |
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push(@{$self->{'diagnostics'}}, [$tag, $_, $diag{$_}]); |
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} |
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} |
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if ($parm{Text}) { |
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$self->{'text'} .= $parm{Text}; |
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} |
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|
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$self; |
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} |
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|
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|
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sub diagnostics { |
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my $self = shift; |
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|
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@{$self->{'diagnostics'}}; |
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} |
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|
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sub header { |
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my $self = shift; |
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|
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@{$self->{'header'}}; |
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} |
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|
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sub text { |
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my $self = shift; |
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|
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$self->{'text'}; |
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} |
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|
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package WAIT::Wais::Docid; |
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|
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sub new { |
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my $type = shift; |
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my ($server, $database, $dodid) = @_; |
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my $self = join ';', $server, $database, $dodid; |
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bless \$self, $type; |
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} |
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|
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sub did { |
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($_[0]->split)[2]; |
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} |
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|
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sub split { |
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my $self = shift; |
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|
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split /;/, $$self; |
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} |
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|
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