/[swish]/trunk/spider/filter.pm
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Contents of /trunk/spider/filter.pm

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Revision 74 - (show annotations)
Wed Apr 7 12:54:21 2004 UTC (15 years, 10 months ago) by dpavlin
File size: 4833 byte(s)
fix title extraction (again)

1 sub filter {
2 my $contents = shift || return;
3
4 my $verbose = 0;
5
6 # 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,<!--\s*noindex\s*-->.+?<!--\s*/noindex\s*-->,,isg;
12 $contents =~ s,<!--\s*noindex\s*-->.+?<!--\s*index\s*-->,,isg;
13 # this will remove all script from indexing content
14 $contents =~ s,<script[^>]*>.+?</script>,,isg;
15 # remap Windows charset to ISO-8859-2
16 $contents =~ tr/šðžèæŠÐŽÈÆ/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 # remove empty lines before/after <html>
27 $contents =~ s/^\s+(<html>)/$1/is;
28 $contents =~ s/(<\/html>)\s+$/$1/is;
29 # remove cr
30 $contents =~ s/\r//gs;
31
32 # remove SQL Magazine header and footer
33 $contents =~ s/<!-- begin topnav area -->.+?<!-- end topnav area -->/<\/table>/is;
34 $contents =~ s/<!--Begin Footer-->.+?<\/table>/<\/table>/is;
35
36 # remote TPJ left column
37 if ($contents =~ s,<!-- BEGIN LEFT SIDE BAR CELL -->.+?<!-- END LEFT SIDE BAR CELL -->,,isg) {
38 my $title;
39 # extract title and add to title
40 if ($contents =~ m,<!-- the article goes here -->\s*<h2[^>]*>(.+?)</h2>,si) {
41 $title = $1;
42 } elsif ($contents =~ m,<h1[^>]*>(.+?)</h1>,is) {
43 $title = $1;
44 } elsif ($contents =~ m,<h2[^>]*>(.+?)</h2>,is) {
45 $title = $1;
46 } else {
47 $title = "no detail title";
48 }
49 $contents =~ s,(<title>)([^<]+)(</title>),$1$2: $title$3,gsi if ($title);
50
51 }
52
53 # is second argument collection?
54 my $collection = shift || return $contents;
55
56 # construct new title (from various parts of DocBook if available)
57 my $new_title;
58
59 if ($contents =~ m,<!--SafTocEntry="([^"]+)"-->,is) {
60 $new_title = $1;
61 print STDERR "using title '$new_title' from <!--SafTocEntry-->\n" if ($verbose);
62 } elsif ($contents =~ m,<(h\d)\s+class="docPartTitle"[^>]*>(.+?)</\1>,is) {
63 $new_title = $2;
64 print STDERR "using title '$new_title' from docPartTitle\n" if ($verbose);
65 } elsif ($contents =~ m,<(h\d)\s+class="docChapterTitle"[^>]*>(.+?)</\1>,is) {
66 $new_title = $2;
67 print STDERR "using title '$new_title' from docChapterTitle\n" if ($verbose);
68 } elsif ($contents =~ m,<(h\d)\s+class="docSection1Title"[^>]*>(.+?)</\1>,is) {
69 $new_title = $2;
70 print STDERR "using title '$new_title' from docSection1Title\n" if ($verbose);
71 } elsif ($contents =~ m,<(h\d)\s+class="doc[^"]*Title"[^>]*>(.+?)</\1>,is) {
72 $new_title = $2;
73 print STDERR "using title '$new_title' from doc.+Title\n" if ($verbose);
74 } elsif ($contents =~ m,<(h\d)\s+class="chapter"[^>]*>(.+?)</\1>,is) {
75 $new_title = $2;
76 print STDERR "using title '$new_title' from chapter\n" if ($verbose);
77 } elsif ($contents =~ m,<(h\d)\s+class="sect1"[^>]*>(.+?)</\1>,is) {
78 $new_title = $2;
79 print STDERR "using title '$new_title' from sect1\n" if ($verbose);
80 } else {
81 if ($contents =~ m,<title>([^<]+)</title>,is) {
82 $new_title = $1;
83 print STDERR "using title '$new_title' from <title>\n" if ($verbose);
84 } elsif ($contents =~ m,<h\d[^>]*>([^<]+)</h\d>,is) {
85 $new_title = $1;
86 print STDERR "using title '$new_title' from <h_>\n" if ($verbose);
87 }
88 }
89
90 if ($new_title) {
91 # nuke html in title
92 $new_title =~ s/<br>\s+/: /gs;
93 $new_title =~ s/<\/*[^>]+>//gs;
94
95 # check if new title is same as collection name
96 my ($a,$b) = ($new_title,$collection);
97 $a =~ s/([^a-zA-Z])+/ /gs;
98 $b =~ s/([^a-zA-Z])+/ /gs;
99 if ($a =~ m/$b/i) {
100 $new_title = $collection;
101 print STDERR "new_title and collection are same! [$new_title]\n" if ($verbose);
102 } else {
103 $new_title = "$collection :: $new_title";
104 }
105 } else {
106 # fall-back to collection title
107 $new_title = $collection;
108 }
109
110 $new_title =~ s/\s\s+/ /g;
111
112 if ($contents =~ s,<title>(.*)</title>,<title>$new_title</title>,is) {
113 print STDERR "replace title '$1' with '$new_title'\n" if ($verbose);
114 } elsif ($contents =~ s,(<head>),$1<title>$new_title</title>,is) {
115 print STDERR "adding title '$new_title' after <head>\n" if ($verbose);
116
117 } elsif ($contents =~ s,(<html>),$1<head><title>$new_title</title></head>,is) {
118 print STDERR "adding title '$new_title' after <html>\n" if ($verbose);
119
120 } elsif ($contents =~ s,^,<title>$new_title</title>,) {
121 print STDERR "adding new title '$new_title'\n" if ($verbose);
122 } else {
123 print STDERR "WARNING: filter couldn't add new title '$new_title' anywhere!";
124 }
125
126 return $contents;
127 }
128
129 1;

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