trunk/spider/filter.pm

sub filter {
        my $contents = shift || return;

#       my $verbose = 1;
        
        # if you don't want content to be indexed, include it in
        # <noindex> foobar </noindex> tags or surround it with comments
        # <!-- noindex --> foobar <!-- /noindex -->
        # <!-- noindex --> foobar <!-- index --> (also supported by swish)
        $contents =~ s,<noindex>.+?</noindex>,,isg;
        $contents =~ s,<!--\s*noindex\s*-->.+?<!--\s*/noindex\s*-->,,isg;
        $contents =~ s,<!--\s*noindex\s*-->.+?<!--\s*index\s*-->,,isg;
        # this will remove all script from indexing content
        $contents =~ s,<script[^>]*>.+?</script>,,isg;
        # remap Windows charset to ISO-8859-2
        $contents =~ tr/ðèæÐÈÆ/¹ð¾èæ©Ð®ÈÆ/; # 1250 -> iso8859-2
        # this will fix badly formatted html in form:
        # <head><title>some text</title
        # ></head>
        # which will confuse indexer (or libxml2?)
        $contents =~ s/[\n\r]^(>)/$1\n/msg;
        # remove comments between <html> and <head> texi2html inserts them
        # there and swish can't find document title then (libxml or swish bug?)
        while ($contents =~ s/(<html>.*)<!--.*?-->(.*<head>)/$1$2/msi) { };

        # remote TPJ left column
        if ($contents =~ s,<!-- BEGIN LEFT SIDE BAR CELL -->.+?<!-- END LEFT SIDE BAR CELL -->,,isg) {
                my $title;
                # extract title and add to title
                if ($contents =~ m,<!-- the article goes here -->\s*<h2[^>]*>(.+?)</h2>,si) {
                        $title = $1;
                } elsif ($contents =~ m,<h1[^>]*>(.+?)</h1>,is) {
                        $title = $1;
                } elsif ($contents =~ m,<h2[^>]*>(.+?)</h2>,is) {
                        $title = $1;
                } else {
                        $title = "no detail title";
                }
                $contents =~ s,(<title>)([^<]+)(</title>),$1$2: $title$3,gsi if ($title);

        }

        # is second argument collection?
        my $collection = shift || return $contents;

        # construct new title (from various parts of DocBook if available)
        my $new_title;

        if ($contents =~ m,<!--SafTocEntry="([^"]+)"-->,is) {
                $new_title = $1;
        } elsif ($contents =~ m,<h\d\sclass="docPartTitle"[^>]*>([^<]+)</h\d>,is) {
                $new_title = $1;
        } elsif ($contents =~ m,<h\d\sclass="docChapterTitle"[^>]*>([^<]+)</h\d>,is) {
                $new_title = $1;
        } elsif ($contents =~ m,<h\d\sclass="docSection1Title"[^>]*>([^<]+)</h\d>,is) {
                $new_title = $1;
        } else {
                if ($contents =~ m,<title>([^<]+)</title>,is) {
                        $new_title = $1;
                } elsif ($contents =~ m,<h\d[^>]*>([^<]+)</h\d>,is) {
                        $new_title = $1;
                }
        }

        if ($new_title) {
                # check if new title is same as collection name
                my ($a,$b) = ($new_title,$collection);
                $a =~ s/([^a-zA-Z])+/ /gs;
                $b =~ s/([^a-zA-Z])+/ /gs;
                if ($a =~ m/$b/i) {
                        $new_title = $collection;
                } else {
                        $new_title = "$collection :: $new_title";
                }
        } else {
                # fall-back to collection title
                $new_title = $collection;
        }

        $new_title =~ s/\s\s+/ /g;

        if ($contents =~ s,<title>(.*)</title>,<title>$new_title</title>,is) {
                print STDERR "replace title '$1' with '$new_title'\n" if ($verbose);
        } elsif (
                        # try to insert after <head>, <html> or at top
                $contents =~ s,(<head>),$1<title>$new_title</title>,is ||
                $contents =~ s,(<html>),$1<title>$new_title</title>,is ||
                        $contents =~ s,^,<title>$new_title</title>, ) {
                print STDERR "adding new title '$new_title'\n" if ($verbose);
        }

        return $contents;
}

1;
1	dpavlin	46	sub filter {
2			my $contents = shift \|\| return;
3	dpavlin	57
4			# my $verbose = 1;
5
6	dpavlin	46	# if you don't want content to be indexed, include it in
7			# <noindex> foobar </noindex> tags or surround it with comments
8			# <!-- noindex --> foobar <!-- /noindex -->
9			# <!-- noindex --> foobar <!-- index --> (also supported by swish)
10			$contents =~ s,<noindex>.+?</noindex>,,isg;
11			$contents =~ s,<!--\snoindex\s-->.+?<!--\s/noindex\s-->,,isg;
12			$contents =~ s,<!--\snoindex\s-->.+?<!--\sindex\s-->,,isg;
13			# this will remove all script from indexing content
14	dpavlin	51	$contents =~ s,<script[^>]*>.+?</script>,,isg;
15	dpavlin	46	# remap Windows charset to ISO-8859-2
16			$contents =~ tr/ðèæÐÈÆ/¹ð¾èæ©Ð®ÈÆ/; # 1250 -> iso8859-2
17			# this will fix badly formatted html in form:
18			# <head><title>some text</title
19			# ></head>
20			# which will confuse indexer (or libxml2?)
21			$contents =~ s/[\n\r]^(>)/$1\n/msg;
22			# remove comments between <html> and <head> texi2html inserts them
23			# there and swish can't find document title then (libxml or swish bug?)
24			while ($contents =~ s/(<html>.)<!--.?-->(.*<head>)/$1$2/msi) { };
25
26			# remote TPJ left column
27			if ($contents =~ s,<!-- BEGIN LEFT SIDE BAR CELL -->.+?<!-- END LEFT SIDE BAR CELL -->,,isg) {
28			my $title;
29			# extract title and add to title
30			if ($contents =~ m,<!-- the article goes here -->\s<h2[^>]>(.+?)</h2>,si) {
31			$title = $1;
32			} elsif ($contents =~ m,<h1[^>]*>(.+?)</h1>,is) {
33			$title = $1;
34			} elsif ($contents =~ m,<h2[^>]*>(.+?)</h2>,is) {
35			$title = $1;
36			} else {
37			$title = "no detail title";
38			}
39			$contents =~ s,(<title>)([^<]+)(</title>),$1$2: $title$3,gsi if ($title);
40
41			}
42	dpavlin	51
43	dpavlin	56	# is second argument collection?
44			my $collection = shift \|\| return $contents;
45
46			# construct new title (from various parts of DocBook if available)
47			my $new_title;
48
49			if ($contents =~ m,<!--SafTocEntry="([^"]+)"-->,is) {
50			$new_title = $1;
51			} elsif ($contents =~ m,<h\d\sclass="docPartTitle"[^>]*>([^<]+)</h\d>,is) {
52			$new_title = $1;
53			} elsif ($contents =~ m,<h\d\sclass="docChapterTitle"[^>]*>([^<]+)</h\d>,is) {
54			$new_title = $1;
55			} elsif ($contents =~ m,<h\d\sclass="docSection1Title"[^>]*>([^<]+)</h\d>,is) {
56			$new_title = $1;
57			} else {
58			if ($contents =~ m,<title>([^<]+)</title>,is) {
59			$new_title = $1;
60			} elsif ($contents =~ m,<h\d[^>]*>([^<]+)</h\d>,is) {
61			$new_title = $1;
62			}
63			}
64
65			if ($new_title) {
66			# check if new title is same as collection name
67			my ($a,$b) = ($new_title,$collection);
68			$a =~ s/([^a-zA-Z])+/ /gs;
69			$b =~ s/([^a-zA-Z])+/ /gs;
70			if ($a =~ m/$b/i) {
71			$new_title = $collection;
72			} else {
73			$new_title = "$collection :: $new_title";
74			}
75			} else {
76			# fall-back to collection title
77			$new_title = $collection;
78			}
79
80			$new_title =~ s/\s\s+/ /g;
81
82	dpavlin	57	if ($contents =~ s,<title>(.*)</title>,<title>$new_title</title>,is) {
83			print STDERR "replace title '$1' with '$new_title'\n" if ($verbose);
84			} elsif (
85			# try to insert after <head>, <html> or at top
86	dpavlin	56	$contents =~ s,(<head>),$1<title>$new_title</title>,is \|\|
87			$contents =~ s,(<html>),$1<title>$new_title</title>,is \|\|
88	dpavlin	57	$contents =~ s,^,<title>$new_title</title>, ) {
89			print STDERR "adding new title '$new_title'\n" if ($verbose);
90	dpavlin	56	}
91
92	dpavlin	46	return $contents;
93			}
94
95			1;