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dpavlin |
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#!/usr/bin/perl -w |
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package FormatResult; |
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use strict; |
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=head1 NAME |
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FormatResult - functions to pretty print results from search engine |
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=head1 SYNOPSIS |
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print FormatResult::get_snippet($text, @words); |
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print FormatResult::highlite_words(\$text, \@words); |
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=head1 DESCRIPTION |
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Big brown hack in current stage. |
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=head2 get_snippet |
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FormatResult::context_chars = 20; |
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my $text = FormatResult::get_snippet($text, @words); |
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This functions will return snippet with words in it, showing |
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C<FormatResult::context_chars> characters around each searched word. |
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It's clever enough to find word delimiters and generally do the right thing. |
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It will call C<highlite_words> automatically. |
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=cut |
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# maximum length of context in characters |
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my $context_chars = 50; |
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sub get_snippet { |
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my $desc = shift || return ''; |
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# construct regex |
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my $re = qq/^(.*?\\b)(/ . join('|', @_) . qq/)/; |
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my $ellip = ' ... '; |
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my $snippet = ''; |
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#print "<ul>"; |
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while ($desc =~ s/$re//si) { |
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my ($foo, $match) = ($1,$2); |
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#print "<br>desc: <small>$desc</small>\n"; |
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#print "<br>foo: <small>$foo<b>$match</b></small>\n"; |
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if (length($foo) < $context_chars * 2) { |
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$snippet .= $foo . $match; |
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} else { |
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if ($foo =~ m/^(.{0,$context_chars})(\s.*?\s|\s|)?(.{0,$context_chars})$/) { |
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# print "<li><small>$snippet</small><br> |
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# ",length($1),": <i>$1</i><br> |
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# ",length($2),": <span style=\"color:grey\">$2</span><br> |
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# ",length($3),": <i>$3</i><br> |
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# <b>$match</b>\n"; |
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if ($snippet) { |
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$snippet .= $1 . $ellip . $3 . $match; |
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} else { |
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$snippet = $ellip . $3 . $match ; |
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} |
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} else { |
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# print "<li> <big>SKIP</big> $foo\n"; |
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print STDERR "this shouldn't happen!\n"; |
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} |
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} |
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} |
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#print "</ul>"; |
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$snippet .= $ellip if ($snippet); |
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return highlite_words(\$snippet,\@_); |
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} |
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=head2 highlite_words |
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my $text = FormatResult::highlite_words(\$text, \@words); |
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This is stand-alone function which does highlite. It cycle colors |
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and generate html. Have in mind that it takes ref arguments. |
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=cut |
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sub highlite_words { |
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my ($snip_ref,$words_ref) = @_; |
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return '' if (! $snip_ref || ! $words_ref); |
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# sort words from longer to shorter (for hilighting later) |
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my @words = sort { length($b) <=> length($a) } @{$words_ref}; |
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# colors to highlite |
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my @colors = qw{#ffff66 #a0ffff #99ff99 #ff9999 #ff66ff}; |
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# color offset |
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my $i = 0; |
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foreach my $w (@words) { |
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$$snip_ref =~ s,(\b\Q$w\E),<span style="background: $colors[$i]; color:black;">$1</span>,gsi; |
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$i++; |
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$i = 0 if ($i > $#colors); |
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} |
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return $$snip_ref; |
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} |
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=head1 AUTHOR |
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Dobrica Pavlinusic C<dpavlin@rot13.org>, L<http://www.rot13.org/~dpavlin/> |
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=cut |
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