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adcroft |
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#======================================================================= |
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# Simple Highlighting Code |
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# $Id: SimpleHighlight.pm,v 1.1 2001/12/06 07:32:11 whmoseley Exp $ |
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#======================================================================= |
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package SimpleHighlight; |
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use strict; |
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sub new { |
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my ( $class, $results, $metaname ) = @_; |
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my $self = bless { |
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results => $results, # just in case we need a method |
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settings=> $results->config('highlight'), |
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metaname=> $metaname, |
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}, $class; |
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# parse out the query into words |
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my $query = $results->extract_query_match; |
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# Do words exist for this layer (all text at this time) and metaname? |
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# This is a reference to an array of phrases and words |
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if ( $query && exists $query->{text}{$metaname} ) { |
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$self->{query} = $query->{text}{$metaname}; |
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$self->set_match_regexp; |
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} |
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return $self; |
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} |
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sub highlight { |
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my ( $self, $properties ) = @_; |
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return unless $self->{query}; |
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my $phrase_array = $self->{query}; |
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my $settings = $self->{settings}; |
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my $metaname = $self->{metaname}; |
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# Do we care about this meta? |
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return unless exists $settings->{meta_to_prop_map}{$metaname}; |
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# Get the related properties |
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my @props = @{ $settings->{meta_to_prop_map}{$metaname} }; |
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for ( @props ) { |
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if ( $properties->{$_} ) { |
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$self->highlight_text( \$properties->{$_}, $phrase_array ); |
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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 highlight_text { |
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my ( $self, $text_ref, $phrase_array ) = @_; |
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my $settings = $self->{settings}; |
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my $Show_Words = $settings->{show_words} || 10; |
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my $Occurrences = $settings->{occurrences} || 5; |
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my $Max_Words = $settings->{max_words} || 100; |
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my $On = $settings->{highlight_on} || '<b>'; |
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my $Off = $settings->{highlight_off} || '</b>'; |
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my @words = split /\s+/, $$text_ref; |
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if ( @words > $Max_Words ) { |
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$$text_ref = join ' ', @words[0..$Max_Words], '<b>...</b>'; |
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} |
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for ( @{ $self->{matches} } ) { |
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$$text_ref =~ s/($_)/$On$1$Off/g; |
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} |
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} |
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#============================================ |
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# Returns compiled regular expressions for matching |
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# |
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# This builds a list of expressions to match against the text. |
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sub set_match_regexp { |
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my $self = shift; |
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my $results = $self->{results}; |
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my $wc = $results->header('wordcharacters'); |
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$wc = quotemeta $wc; |
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my @matches; |
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# loop through all the phrase |
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for ( @{$self->{query}} ) { |
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# Fix up wildcards |
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my $exp = join '[^$wc]+', |
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map { '\b' . $_ . '\b' } |
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map { substr( $_, -1, 1 ) eq '*' |
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? quotemeta( substr( $_, 0, -1) ) . "[$wc]*?" |
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: quotemeta |
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} @$_; |
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push @matches, qr/$exp/i; |
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} |
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$self->{matches} = \@matches; |
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} |
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1; |
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