| 1 | ###########################################################################
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| 2 | #
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| 3 | # HBPlug.pm --
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| 4 | # A component of the Greenstone digital library software
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| 5 | # from the New Zealand Digital Library Project at the
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| 6 | # University of Waikato, New Zealand.
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| 7 | #
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| 8 | # Copyright (C) 1999 New Zealand Digital Library Project
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| 9 | #
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| 10 | # This program is free software; you can redistribute it and/or modify
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| 11 | # it under the terms of the GNU General Public License as published by
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| 12 | # the Free Software Foundation; either version 2 of the License, or
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| 13 | # (at your option) any later version.
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| 14 | #
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| 15 | # This program is distributed in the hope that it will be useful,
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| 16 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 17 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 18 | # GNU General Public License for more details.
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| 19 | #
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| 20 | # You should have received a copy of the GNU General Public License
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| 21 | # along with this program; if not, write to the Free Software
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| 22 | # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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| 23 | #
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| 24 | ###########################################################################
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| 25 |
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| 26 | # plugin which processes an HTML book directory
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| 27 |
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| 28 | # This plugin is used by the Humanity Library collections and does not handle
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| 29 | # input encodings other than ascii or extended ascii
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| 30 |
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| 31 | # this code is kind of ugly and could no doubt be made to run faster, by leaving
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| 32 | # it in this state I hope to encourage people to make their collections use
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| 33 | # HBSPlug instead ;-)
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| 34 |
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| 35 | # Use HBSPlug if creating a new collection and marking up files like the
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| 36 | # Humanity Library collections. HBSPlug accepts all input encodings but
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| 37 | # expects the marked up files to be cleaner than those used by the
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| 38 | # Humanity Library collections
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| 39 |
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| 40 | package HBPlug;
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| 41 |
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| 42 | use ghtml;
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| 43 | use BasPlug;
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| 44 | use util;
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| 45 | use doc;
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| 46 |
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| 47 |
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| 48 | sub BEGIN {
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| 49 | @ISA = ('BasPlug');
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| 50 | }
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| 51 |
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| 52 | sub new {
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| 53 | my ($class) = @_;
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| 54 | my $self = new BasPlug ("HBPlug", @_);
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| 55 |
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| 56 | return bless $self, $class;
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| 57 | }
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| 58 |
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| 59 | sub init {
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| 60 | my $self = shift (@_);
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| 61 | my ($verbosity, $outhandle) = @_;
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| 62 |
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| 63 | $self->BasPlug::init($verbosity, $outhandle);
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| 64 |
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| 65 | # this plugin only handles ascii encodings
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| 66 | if ($self->{'input_encoding'} !~ /^(iso_8859_1|ascii)$/) {
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| 67 | die "ERROR: HBPlug can handle only iso_8859_1 or ascii encodings.\n" .
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| 68 | $self->{'input_encoding'} . " is not an acceptable input_encoding value\n";
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| 69 | }
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| 70 | }
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| 71 |
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| 72 | # this is included only to prevent warnings being printed out
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| 73 | # from BasPlug::init. The process_exp is not used by this plugin
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| 74 | sub get_default_process_exp {
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| 75 | my $self = shift (@_);
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| 76 |
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| 77 | return "This plugin does not use a process_exp\n";
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| 78 | }
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| 79 |
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| 80 |
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| 81 | sub HB_read_html_file {
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| 82 | my $self = shift (@_);
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| 83 | my ($htmlfile, $text) = @_;
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| 84 |
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| 85 | # load in the file
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| 86 | if (!open (FILE, $htmlfile)) {
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| 87 | my $outhandle = $self->{'outhandle'};
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| 88 | print $outhandle "ERROR - could not open $htmlfile\n";
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| 89 | return;
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| 90 | }
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| 91 |
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| 92 | my $foundbody = 0;
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| 93 | $self->HB_gettext (\$foundbody, $text, "FILE");
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| 94 | close FILE;
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| 95 |
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| 96 | # just in case there was no <body> tag
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| 97 | if (!$foundbody) {
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| 98 | $foundbody = 1;
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| 99 | open (FILE, $htmlfile) || return;
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| 100 | $self->HB_gettext (\$foundbody, $text, "FILE");
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| 101 | close FILE;
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| 102 | }
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| 103 | }
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| 104 |
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| 105 | sub HB_gettext {
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| 106 | my $self = shift (@_);
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| 107 | my ($foundbody, $text, $handle) = @_;
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| 108 | my $outhandle = $self->{'outhandle'};
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| 109 |
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| 110 | my $line = "";
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| 111 | while (defined ($line = <$handle>)) {
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| 112 | # look for body tag
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| 113 | if (!$$foundbody) {
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| 114 | if ($line =~ s/^.*<body[^>]*>//i) {
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| 115 | $$foundbody = 1;
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| 116 | } else {
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| 117 | next;
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| 118 | }
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| 119 | }
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| 120 |
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| 121 | # check for symbol fonts
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| 122 | if ($line =~ /<font [^>]*?face\s*=\s*\"?(\w+)\"?/i) {
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| 123 | my $font = $1;
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| 124 | print $outhandle "HBPlug::HB_gettext - warning removed font $font\n"
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| 125 | if ($font !~ /^arial$/i);
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| 126 | }
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| 127 |
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| 128 | $line =~ s/<\/p>//ig; # remove </p> tags
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| 129 | $line =~ s/<\/?(body|html|font)\b[^>]*>//ig; # remove any unwanted tags
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| 130 |
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| 131 | # convert any alphanumeric character entities to their extended
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| 132 | # ascii equivalent for indexing purposes
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| 133 | &ghtml::convertcharentities ($line);
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| 134 |
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| 135 | $$text .= $line;
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| 136 | }
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| 137 | $$text =~ s/\s+/ /g; # remove \n's
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| 138 | }
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| 139 |
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| 140 | sub HB_clean_section {
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| 141 | my $self = shift (@_);
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| 142 | my ($section) = @_;
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| 143 |
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| 144 | # remove tags without a starting tag from the section
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| 145 | my ($tag, $tagstart);
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| 146 | while ($section =~ /<\/([^>]{1,10})>/) {
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| 147 | $tag = $1;
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| 148 | $tagstart = index($section, "<$tag");
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| 149 | last if (($tagstart >= 0) && ($tagstart < index($section, "<\/$tag")));
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| 150 | $section =~ s/<\/$tag>//;
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| 151 | }
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| 152 |
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| 153 | # remove extra paragraph tags
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| 154 | while ($section =~ s/<p\b[^>]*>\s*<p\b/<p/ig) {}
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| 155 |
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| 156 | # remove extra stuff at the end of the section
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| 157 | while ($section =~ s/(<u>|<i>|<b>|<p\b[^>]*>| |\s)$//i) {}
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| 158 |
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| 159 | # add a newline at the beginning of each paragraph
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| 160 | $section =~ s/(.)\s*<p\b/$1\n\n<p/gi;
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| 161 |
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| 162 | # add a newline every 80 characters at a word boundary
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| 163 | # Note: this regular expression puts a line feed before
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| 164 | # the last word in each section, even when it is not
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| 165 | # needed.
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| 166 | $section =~ s/(.{1,80})\s/$1\n/g;
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| 167 |
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| 168 | # fix up the image links
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| 169 | $section =~ s/<img[^>]*?src=\"?([^\">]+)\"?[^>]*>/
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| 170 | <center><img src=\"_httpdocimg_\/$1\"><\/center><br>/ig;
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| 171 | $section =~ s/<<I>>\s*([^\.]+\.(png|jpg|gif))/
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| 172 | <center><img src=\"_httpdocimg_\/$1\"><\/center><br>/ig;
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| 173 |
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| 174 | return $section;
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| 175 | }
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| 176 |
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| 177 |
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| 178 | sub shorten {
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| 179 | my $self = shift (@_);
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| 180 | my ($text) = @_;
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| 181 |
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| 182 | return "\"$text\"" if (length($text) < 100);
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| 183 |
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| 184 | return "\"" . substr ($text, 0, 50) . "\" ... \"" .
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| 185 | substr ($text, length($text)-50) . "\"";
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| 186 | }
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| 187 |
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| 188 | # if input_encoding is ascii we can call add_utf8_metadata
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| 189 | # directly but if it's iso_8859_1 (the default) we need to call
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| 190 | # add_metadata so that the ascii2utf8 conversion is done first
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| 191 | # this should speed things up a little if processing an ascii only
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| 192 | # document with input_encoding set to ascii
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| 193 | sub HB_add_metadata {
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| 194 | my $self = shift (@_);
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| 195 | my ($doc_obj, $cursection, $field, $value) = @_;
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| 196 |
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| 197 | if ($self->{'input_encoding'} eq "ascii") {
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| 198 | $doc_obj->add_utf8_metadata ($cursection, $field, $value);
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| 199 | } else {
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| 200 | $doc_obj->add_metadata ($cursection, $field, $value);
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| 201 | }
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| 202 | }
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| 203 |
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| 204 | # return number of files processed, undef if can't process
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| 205 | # Note that $base_dir might be "" and that $file might
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| 206 | # include directories
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| 207 | sub read {
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| 208 | my $self = shift (@_);
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| 209 | my ($pluginfo, $base_dir, $file, $metadata, $processor) = @_;
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| 210 | my $outhandle = $self->{'outhandle'};
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| 211 |
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| 212 | # get the html filename and see if this is an HTML Book...
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| 213 | my $jobnumber = $file;
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| 214 | if ($file =~ /[\\\/]/) {
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| 215 | ($jobnumber) = $file =~ /[\\\/]([^\\\/]+)$/;
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| 216 | }
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| 217 | return undef unless defined $jobnumber;
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| 218 | my $htmlfile = &util::filename_cat($base_dir, $file, "$jobnumber.htm");
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| 219 | return undef unless -e $htmlfile;
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| 220 |
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| 221 | print $outhandle "HBPlug: processing $file\n";
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| 222 |
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| 223 | # read in the file and do basic html cleaning (removing header etc)
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| 224 | my $html = "";
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| 225 | $self->HB_read_html_file ($htmlfile, \$html);
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| 226 |
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| 227 | # create a new document
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| 228 | my $doc_obj = new doc ($file, "indexed_doc");
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| 229 | $doc_obj->set_OIDtype ($processor->{'OIDtype'});
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| 230 |
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| 231 | # copy the book cover if it exists
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| 232 | my $bookcover = &util::filename_cat($base_dir, $file, "$jobnumber.jpg");
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| 233 | $doc_obj->associate_file($bookcover, "cover.jpg", "image/jpeg");
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| 234 |
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| 235 | my $cursection = $doc_obj->get_top_section();
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| 236 |
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| 237 | # add metadata for top level of document
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| 238 | foreach my $field (keys(%$metadata)) {
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| 239 | # $metadata->{$field} may be an array reference
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| 240 | if (ref ($metadata->{$field}) eq "ARRAY") {
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| 241 | map {
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| 242 | $self->HB_add_metadata ($doc_obj, $cursection, $field, $_);
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| 243 | } @{$metadata->{$field}};
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| 244 | } else {
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| 245 | $self->HB_add_metadata ($doc_obj, $cursection, $field, $metadata->{$field});
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| 246 | }
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| 247 | }
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| 248 |
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| 249 | # process the file one section at a time
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| 250 | my $curtoclevel = 1;
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| 251 | my $firstsection = 1;
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| 252 | while (length ($html) > 0) {
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| 253 | if ($html =~ s/^.*?(?:<p\b[^>]*>)?((<b>|<i>|<u>|\s)*)<<TOC(\d+)>>\s*(.*?)<p\b/<p/i) {
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| 254 | my $toclevel = $3;
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| 255 | my $title = $4;
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| 256 | my $sectiontext = "";
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| 257 | if ($html =~ s/^(.*?)((?:<p\b[^>]*>)?((<b>|<i>|<u>|\s)*)<<TOC\d+>>)/$2/i) {
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| 258 | $sectiontext = $1;
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| 259 | } else {
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| 260 | $sectiontext = $html;
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| 261 | $html = "";
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| 262 | }
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| 263 |
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| 264 | # remove tags and extra spaces from the title
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| 265 | $title =~ s/<\/?[^>]+>//g;
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| 266 | $title =~ s/^\s+|\s+$//g;
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| 267 |
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| 268 | # close any sections below the current level and
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| 269 | # create a new section (special case for the firstsection)
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| 270 | while (($curtoclevel > $toclevel) ||
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| 271 | (!$firstsection && $curtoclevel == $toclevel)) {
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| 272 | $cursection = $doc_obj->get_parent_section ($cursection);
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| 273 | $curtoclevel--;
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| 274 | }
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| 275 | if ($curtoclevel+1 < $toclevel) {
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| 276 | print $outhandle "WARNING - jump in toc levels in $htmlfile " .
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| 277 | "from $curtoclevel to $toclevel\n";
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| 278 | }
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| 279 | while ($curtoclevel < $toclevel) {
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| 280 | $curtoclevel++;
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| 281 | $cursection =
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| 282 | $doc_obj->insert_section($doc_obj->get_end_child($cursection));
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| 283 | }
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| 284 |
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| 285 | # add the metadata to this section
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| 286 | $self->HB_add_metadata ($doc_obj, $cursection, "Title", $title);
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| 287 |
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| 288 | # clean up the section html
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| 289 | $sectiontext = $self->HB_clean_section($sectiontext);
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| 290 |
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| 291 | # associate any files
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| 292 | map { $doc_obj->associate_file(&util::filename_cat ($base_dir, $file, $1), $1)
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| 293 | if /_httpdocimg_\/([^\"]+)\"/; 0; }
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| 294 | split (/(_httpdocimg_\/[^\"]+\")/, $sectiontext);
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| 295 |
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| 296 | # add the text for this section
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| 297 | if ($self->{'input_encoding'} eq "ascii") {
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| 298 | $doc_obj->add_utf8_text ($cursection, $sectiontext);
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| 299 | } else {
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| 300 | $doc_obj->add_text ($cursection, $sectiontext);
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| 301 | }
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| 302 | } else {
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| 303 | print $outhandle "WARNING - leftover text\n" , $self->shorten($html),
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| 304 | "\nin $htmlfile\n";
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| 305 | last;
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| 306 | }
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| 307 | $firstsection = 0;
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| 308 | }
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| 309 |
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| 310 | # add a OID
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| 311 | $doc_obj->set_OID ();
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| 312 |
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| 313 | # process the document
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| 314 | $processor->process($doc_obj, &util::filename_cat($file, "$jobnumber.htm"));
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| 315 |
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| 316 | return 1; # processed the file
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| 317 | }
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| 318 |
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| 319 |
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| 320 | 1;
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