/[swish]/trunk/spider/filter.pm
This is repository of my old source code which isn't updated any more. Go to git.rot13.org for current projects!
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Contents of /trunk/spider/filter.pm

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Revision 71 - (show annotations)
Sat Apr 3 15:15:36 2004 UTC (19 years, 11 months ago) by dpavlin
File size: 3962 byte(s)
remove empty lines before <html> so that swish parser will catch <title>
correctly

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 = $1;
61 } elsif ($contents =~ m,<(h\d)\sclass="docPartTitle"[^>]*>(.+?)<\1>,is) {
62 $new_title = $2;
63 } elsif ($contents =~ m,<(h\d)\sclass="docChapterTitle"[^>]*>(.+?)<\1>,is) {
64 $new_title = $2;
65 } elsif ($contents =~ m,<(h\d)\sclass="docSection1Title"[^>]*>(.+?)<\1>,is) {
66 $new_title = $2;
67 } elsif ($contents =~ m,<(h\d)\sclass="chapter"[^>]*>(.+?)<\1>,is) {
68 $new_title = $2;
69 } elsif ($contents =~ m,<(h\d)\sclass="sect1"[^>]*>(.+?)<\1>,is) {
70 $new_title = $2;
71 } else {
72 if ($contents =~ m,<title>([^<]+)</title>,is) {
73 $new_title = $1;
74 } elsif ($contents =~ m,<h\d[^>]*>([^<]+)</h\d>,is) {
75 $new_title = $1;
76 }
77 }
78
79 if ($new_title) {
80 # nuke html in title
81 $new_title =~ s/<br>\s+/: /gs;
82 $new_title =~ s/<\/*[^>]+>//gs;
83
84 # check if new title is same as collection name
85 my ($a,$b) = ($new_title,$collection);
86 $a =~ s/([^a-zA-Z])+/ /gs;
87 $b =~ s/([^a-zA-Z])+/ /gs;
88 if ($a =~ m/$b/i) {
89 $new_title = $collection;
90 } else {
91 $new_title = "$collection :: $new_title";
92 }
93 } else {
94 # fall-back to collection title
95 $new_title = $collection;
96 }
97
98 $new_title =~ s/\s\s+/ /g;
99
100 if ($contents =~ s,<title>(.*)</title>,<title>$new_title</title>,is) {
101 print STDERR "replace title '$1' with '$new_title'\n" if ($verbose);
102 } elsif ($contents =~ s,(<head>),$1<title>$new_title</title>,is) {
103 print STDERR "adding title '$new_title' after <head>\n" if ($verbose);
104
105 } elsif ($contents =~ s,(<html>),$1<head><title>$new_title</title></head>,is) {
106 print STDERR "adding title '$new_title' after <html>\n" if ($verbose);
107
108 } elsif ($contents =~ s,^,<title>$new_title</title>,) {
109 print STDERR "adding new title '$new_title'\n" if ($verbose);
110 } else {
111 print STDERR "WARNING: filter couldn't add new title '$new_title' anywhere!";
112 }
113
114 return $contents;
115 }
116
117 1;

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