[2356] | 1 | ###########################################################################
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| 2 | #
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| 3 | # BookPlug.pm (formally called HBSPlug) -- plugin for processing simple
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| 4 | # html (or text) books
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| 5 | #
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| 6 | # A component of the Greenstone digital library software
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| 7 | # from the New Zealand Digital Library Project at the
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| 8 | # University of Waikato, New Zealand.
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| 9 | #
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| 10 | # Copyright (C) 1999 New Zealand Digital Library Project
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| 11 | #
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| 12 | # This program is free software; you can redistribute it and/or modify
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| 13 | # it under the terms of the GNU General Public License as published by
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| 14 | # the Free Software Foundation; either version 2 of the License, or
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| 15 | # (at your option) any later version.
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| 16 | #
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| 17 | # This program is distributed in the hope that it will be useful,
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| 18 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 20 | # GNU General Public License for more details.
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| 21 | #
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| 22 | # You should have received a copy of the GNU General Public License
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| 23 | # along with this program; if not, write to the Free Software
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| 24 | # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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| 25 | #
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| 26 | ###########################################################################
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| 27 |
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| 28 | # creates multi-level document from document containing
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| 29 | # <<TOC>> level tags. Metadata for each section is taken from any
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| 30 | # other tags on the same line as the <<TOC>>. e.g. <<Title>>xxxx<</Title>>
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| 31 | # sets Title metadata.
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| 32 |
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| 33 | # Everything else between TOC tags is treated as simple html (i.e. no
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| 34 | # processing of html links or any other HTMLPlug type stuff is done).
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| 35 |
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| 36 | # expects input files to have a .hb file extension by default (this can be
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| 37 | # changed by adding a -process_exp option
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| 38 |
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| 39 | # a file with the same name as the hb file but a .jpg extension is
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| 40 | # taken as the cover image (jpg files are blocked by this plugin)
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| 41 |
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| 42 | # BookPlug is a simplification (and extension) of the HBPlug used
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| 43 | # by the Humanity Library collections. BookPlug is faster as it expects
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| 44 | # the input files to be cleaner (The input to the HDL collections
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| 45 | # contains lots of excess html tags around <<TOC>> tags, uses <<I>>
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| 46 | # tags to specify images, and simply takes all text between <<TOC>>
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| 47 | # tags and start of text to be Title metadata). If you're marking up
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| 48 | # documents to be displayed in the same way as the HDL collections,
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| 49 | # use this plugin instead of HBPlug.
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| 50 |
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| 51 | package BookPlug;
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| 52 |
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| 53 | use BasPlug;
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| 54 | use util;
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| 55 |
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| 56 | sub BEGIN {
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| 57 | @ISA = ('BasPlug');
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| 58 | }
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| 59 |
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| 60 | sub new {
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| 61 | my ($class) = @_;
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| 62 | my $self = new BasPlug ("BookPlug", @_);
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| 63 |
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| 64 | return bless $self, $class;
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| 65 | }
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| 66 |
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| 67 | sub get_default_block_exp {
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| 68 | my $self = shift (@_);
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| 69 |
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| 70 | return q^\.jpg$^;
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| 71 | }
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| 72 |
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| 73 | sub get_default_process_exp {
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| 74 | my $self = shift (@_);
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| 75 |
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| 76 | return q^(?i)\.hb$^;
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| 77 | }
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| 78 |
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| 79 | # do plugin specific processing of doc_obj
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| 80 | sub process {
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| 81 | my $self = shift (@_);
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| 82 | my ($textref, $pluginfo, $base_dir, $file, $metadata, $doc_obj) = @_;
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| 83 | my $outhandle = $self->{'outhandle'};
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| 84 |
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| 85 | print $outhandle "BookPlug: processing $file\n"
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| 86 | if $self->{'verbosity'} > 1;
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| 87 |
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| 88 | my $cursection = $doc_obj->get_top_section();
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| 89 |
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| 90 | my $filename = &util::filename_cat($base_dir, $file);
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| 91 | my $absdir = $filename;
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| 92 | $absdir =~ s/[^\/\\]*$//;
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| 93 |
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| 94 | # add the cover image
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| 95 | my $coverimage = $filename;
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| 96 | $coverimage =~ s/\.[^\.]*$/\.jpg/i;
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| 97 | $doc_obj->associate_file($coverimage, "cover.jpg", "image/jpeg");
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| 98 |
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| 99 | my $title = "";
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| 100 |
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| 101 | # remove any leading rubbish
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| 102 | $$textref =~ s/^.*?(<<TOC)/$1/ios;
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| 103 |
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| 104 | my $curtoclevel = 1;
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| 105 | my $firstsection = 1;
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| 106 | my $toccount = 0;
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| 107 | while ($$textref =~ /\w/) {
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| 108 | $$textref =~ s/^<<TOC(\d+)>>([^\n]*)\n(.*?)(<<TOC|\Z)/$4/ios;
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| 109 | my $toclevel = $1;
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| 110 | my $metadata = $2;
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| 111 | my $sectiontext = $3;
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| 112 |
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| 113 | if ($toclevel == 2) {
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| 114 | $toccount ++;
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| 115 | }
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| 116 |
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| 117 | # close any sections below the current level and
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| 118 | # create a new section (special case for the firstsection)
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| 119 | while (($curtoclevel > $toclevel) ||
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| 120 | (!$firstsection && $curtoclevel == $toclevel)) {
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| 121 | $cursection = $doc_obj->get_parent_section ($cursection);
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| 122 | $curtoclevel--;
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| 123 | }
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| 124 | if ($curtoclevel+1 < $toclevel) {
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| 125 | print $outhandle "WARNING - jump in toc levels in $filename " .
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| 126 | "from $curtoclevel to $toclevel\n";
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| 127 | }
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| 128 | while ($curtoclevel < $toclevel) {
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| 129 | $curtoclevel++;
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| 130 | $cursection =
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| 131 | $doc_obj->insert_section($doc_obj->get_end_child($cursection));
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| 132 | }
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| 133 |
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| 134 | # sort out metadata
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| 135 | while ($metadata =~ s/^.*?<<([^>]*)>>(.*?)<<[^>]*>>//) {
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| 136 | my $metakey = $1;
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| 137 | my $metavalue = $2;
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| 138 |
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| 139 | if ($metavalue ne "" && $metakey ne "") {
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| 140 | # make sure key fits in with gsdl naming scheme
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| 141 | $metakey =~ tr/[A-Z]/[a-z]/;
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| 142 | $metakey = ucfirst ($metakey);
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| 143 | $doc_obj->add_utf8_metadata ($cursection, $metakey, $metavalue);
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| 144 | }
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| 145 | }
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| 146 |
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| 147 | # remove header rubbish
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| 148 | $sectiontext =~ s/^.*?<body[^>]*>//ios;
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| 149 |
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| 150 | # and any other unwanted tags
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| 151 | $sectiontext =~ s/<(\/p|\/html|\/body)>//isg;
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| 152 |
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| 153 | # fix up the image links
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| 154 | $sectiontext =~ s/(<img[^>]*?src\s*=\s*\"?)([^\">]+)(\"?[^>]*>)/
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| 155 | &replace_image_links($absdir, $doc_obj, $1, $2, $3)/isge;
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| 156 |
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| 157 | # add the text
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| 158 | $doc_obj->add_utf8_text($cursection, $sectiontext);
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| 159 |
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| 160 | $firstsection = 0;
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| 161 |
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| 162 | $$textref =~ s/^\s+//s;
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| 163 | }
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| 164 |
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| 165 | return 1;
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| 166 | }
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| 167 |
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| 168 | sub replace_image_links {
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| 169 | my ($dir, $doc_obj, $front, $link, $back) = @_;
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| 170 | my $outhandle = $self->{'outhandle'};
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| 171 |
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| 172 | my ($filename, $error);
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| 173 | my $foundimage = 0;
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| 174 |
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| 175 | $link =~ s/\/\///;
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| 176 | my ($imagetype) = $link =~ /([^\.]*)$/;
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| 177 | $imagetype =~ tr/[A-Z]/[a-z]/;
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| 178 | if ($imagetype eq "jpg") {$imagetype = "jpeg";}
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| 179 | if ($imagetype !~ /^(jpeg|gif|png)$/) {
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| 180 | print $outhandle "BookPlug: Warning - unknown image type ($imagetype)\n";
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| 181 | }
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| 182 | my ($imagefile) = $link =~ /([^\/]*)$/;
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| 183 | my ($imagepath) = $link =~ /^[^\/]*(.*)$/;
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| 184 |
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| 185 | if (defined $imagepath && $imagepath =~ /\w/) {
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| 186 | # relative link
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| 187 | $filename = &util::filename_cat ($dir, $imagepath);
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| 188 | if (-e $filename) {
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| 189 | $doc_obj->associate_file ($filename, $imagefile, "image/$imagetype");
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| 190 | $foundimage = 1;
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| 191 | } else {
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| 192 | $error = "BookPlug: Warning - couldn't find image file $imagefile in either $filename or";
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| 193 | }
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| 194 | }
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| 195 |
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| 196 | if (!$foundimage) {
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| 197 | $filename = &util::filename_cat ($dir, $imagefile);
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| 198 | if (-e $filename) {
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| 199 | $doc_obj->associate_file ($filename, $imagefile, "image/$imagetype");
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| 200 | $foundimage = 1;
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| 201 | } elsif (defined $error) {
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| 202 | print $outhandle "$error $filename\n";
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| 203 | } else {
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| 204 | print $outhandle "BookPlug: Warning - couldn't find image file $imagefile in $filename\n";
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| 205 | }
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| 206 | }
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| 207 |
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| 208 | if ($foundimage) {
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| 209 | return "${front}_httpdocimg_/${imagefile}${back}";
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| 210 | } else {
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| 211 | return "";
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| 212 | }
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| 213 | }
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| 214 |
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| 215 | 1;
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