| 1 | ###########################################################################
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| 2 | #
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| 3 | # W3ImgPlug.pm -- Context-based image indexing plugin for HTML documents
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| 4 | #
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| 5 | # A component of the Greenstone digital library software
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| 6 | # from the New Zealand Digital Library Project at the
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| 7 | # University of Waikato, New Zealand.
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| 8 | #
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| 9 | # Copyright (C) 2001 New Zealand Digital Library Project
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| 10 | #
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| 11 | # This program is free software; you can redistribute it and/or modify
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| 12 | # it under the terms of the GNU General Public License as published by
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| 13 | # the Free Software Foundation; either version 2 of the License, or
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| 14 | # (at your option) any later version.
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| 15 | #
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| 16 | # This program is distributed in the hope that it will be useful,
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| 17 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 18 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 19 | # GNU General Public License for more details.
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| 20 | #
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| 21 | # You should have received a copy of the GNU General Public License
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| 22 | # along with this program; if not, write to the Free Software
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| 23 | # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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| 24 | #
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| 25 | ###########################################################################
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| 26 |
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| 27 | # DESCRIPTION:
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| 28 | #
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| 29 | # Extracts images and associated text and metadata from
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| 30 | # web pages as individual documents for indexing. Thumbnails
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| 31 | # are created from each image for browsing purposes.
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| 32 | #
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| 33 | # Options are available for configuring the aggressiveness of the
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| 34 | # associated text extraction mechanisms. A higher level of
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| 35 | # aggressiveness will extract more text and consequently
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| 36 | # may mean lower accuracy (precision); however, it may also
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| 37 | # retrieve more of the relevant images from the collection (recall).
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| 38 | # Lower levels of aggressiveness maybe result in slightly faster
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| 39 | # collection builds at the import stage.
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| 40 | #
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| 41 | # W3ImgPlug is a subclass of HTMLPlug (i.e. it will index pages also
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| 42 | # if required). It can be used in place of HTMLPlug to index both
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| 43 | # pages and their images.
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| 44 | #
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| 45 | # REQUIREMENTS:
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| 46 | #
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| 47 | # The ImageMagick image manipulation is used to create
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| 48 | # thumbnails and extract some image metadata. (Available
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| 49 | # from http://www.imagemagick.org/)
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| 50 | #
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| 51 | # Unix:
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| 52 | # Many Linux distributions contain ImageMagick.
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| 53 | #
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| 54 | # Windows:
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| 55 | # ImageMagick can be downloaded from the website above.
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| 56 | # Make sure the system path includes the ImageMagick binaries
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| 57 | # before using W3ImgPlug.
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| 58 | #
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| 59 | # NOTE: NT/2000/XP contain a filesystem utility 'convert.exe'
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| 60 | # with the same name as the image conversion utility. The
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| 61 | # ImageMagick FAQ recommends renaming the filesystem
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| 62 | # utility (e.g. to 'fsconvert.exe') to avoid this clash.
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| 63 | #
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| 64 | # USAGE:
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| 65 | #
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| 66 | # An image document consists of metadata elements:
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| 67 | #
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| 68 | # OriginalFilename, FilePath, Filename, FileExt, FileSize,
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| 69 | # Width, Height, URL, PageURL, ThumbURL, CacheURL, CachePageURL
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| 70 | # ImageText, PageTitle
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| 71 | #
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| 72 | # Most of these are only useful in format strings (e.g. ThumbURL,
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| 73 | # Filename, URL, PageURL, CachePageURL).
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| 74 | #
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| 75 | # ImageText, as the name suggests contains the indexable text.
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| 76 | # (unless using the -document_text plugin option)
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| 77 | #
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| 78 | # Since image documents are made up of metadata elements
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| 79 | # alone, format strings are needed to display them properly.
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| 80 | # NOTE: The receptionist will only display results (e.g. thumbnails)
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| 81 | # in 4 columns if the format string begins with "<td><table>".
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| 82 | #
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| 83 | # The example below takes the user to the image within the
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| 84 | # source HTML document rather than using a format string
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| 85 | # on DocumentText to display the image document itself.
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| 86 | #
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| 87 | # Example collect.cfg:
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| 88 | #
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| 89 | # ...
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| 90 | #
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| 91 | # indexes document:ImageText document:text
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| 92 | # defaultindex document:ImageText
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| 93 | #
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| 94 | # collectionmeta .document:ImageText "images"
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| 95 | # collectionmeta .document:text "documents"
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| 96 | #
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| 97 | # ...
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| 98 | #
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| 99 | # plugin W3ImgPlug -index_pages -aggressiveness 6
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| 100 | #
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| 101 | # ...
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| 102 | #
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| 103 | # format SearchVList '<td>{If}{[Title],[link][icon] [Title][[/link],
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| 104 | # <table><tr><td align="center"><a href="[CachePageURL]">
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| 105 | # <img src="[ThumbURL]"></a></td></tr><tr><td align="center">
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| 106 | # <a href="[CachePageURL]"><font size="-1">[OriginalFilename]</font></a>
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| 107 | # <br>[Width]x[Height]</td></tr></table>}</td>'
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| 108 | #
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| 109 | # ...
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| 110 | #
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| 111 |
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| 112 | package W3ImgPlug;
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| 113 |
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| 114 | use HTMLPlug;
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| 115 | use ghtml;
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| 116 | use unicode;
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| 117 | use util;
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| 118 | use parsargv;
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| 119 | use strict 'subs';
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| 120 |
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| 121 | sub BEGIN {
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| 122 | @ISA = qw( HTMLPlug );
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| 123 | }
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| 124 |
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| 125 | my $aggressiveness_list =
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| 126 | [ { 'name' => "1",
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| 127 | 'desc' => "{W3ImgPlug.aggressiveness.1}" },
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| 128 | { 'name' => "2",
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| 129 | 'desc' => "{W3ImgPlug.aggressiveness.2}" },
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| 130 | { 'name' => "3",
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| 131 | 'desc' => "{W3ImgPlug.aggressiveness.3}" },
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| 132 | { 'name' => "4",
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| 133 | 'desc' => "{W3ImgPlug.aggressiveness.4}" },
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| 134 | { 'name' => "5",
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| 135 | 'desc' => "{W3ImgPlug.aggressiveness.5}" },
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| 136 | { 'name' => "6",
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| 137 | 'desc' => "{W3ImgPlug.aggressiveness.6}" },
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| 138 | { 'name' => "7",
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| 139 | 'desc' => "{W3ImgPlug.aggressiveness.7}" },
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| 140 | { 'name' => "8",
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| 141 | 'desc' => "{W3ImgPlug.aggressiveness.8}" },
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| 142 | { 'name' => "9",
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| 143 | 'desc' => "{W3ImgPlug.aggressiveness.9}" } ];
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| 144 |
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| 145 | my $arguments =
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| 146 | [ { 'name' => "aggressiveness",
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| 147 | 'desc' => "{W3ImgPlug.aggressiveness}",
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| 148 | 'type' => "int",
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| 149 | 'list' => $aggressiveness_list,
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| 150 | 'deft' => "3",
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| 151 | 'reqd' => "no" },
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| 152 | { 'name' => "index_pages",
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| 153 | 'desc' => "{W3ImgPlug.index_pages}",
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| 154 | 'type' => "flag",
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| 155 | 'reqd' => "no" },
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| 156 | { 'name' => "no_cache_images",
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| 157 | 'desc' => "{W3ImgPlug.no_cache_images}",
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| 158 | 'type' => "flag",
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| 159 | 'reqd' => "no" },
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| 160 | { 'name' => "min_size",
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| 161 | 'desc' => "{W3ImgPlug.min_size}",
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| 162 | 'type' => "int",
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| 163 | 'deft' => "2000",
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| 164 | 'reqd' => "no" },
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| 165 | { 'name' => "min_width",
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| 166 | 'desc' => "{W3ImgPlug.min_width}",
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| 167 | 'type' => "int",
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| 168 | 'deft' => "50",
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| 169 | 'reqd' => "no" },
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| 170 | { 'name' => "min_height",
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| 171 | 'desc' => "{W3ImgPlug.min_height}",
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| 172 | 'type' => "int",
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| 173 | 'deft' => "50",
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| 174 | 'reqd' => "no" },
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| 175 | { 'name' => "thumb_size",
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| 176 | 'desc' => "{W3ImgPlug.thumb_size}",
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| 177 | 'type' => "int",
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| 178 | 'deft' => "100",
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| 179 | 'reqd' => "no" },
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| 180 | { 'name' => "convert_params",
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| 181 | 'desc' => "{W3ImgPlug.convert_params}",
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| 182 | 'type' => "string",
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| 183 | 'deft' => "",
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| 184 | 'reqd' => "no" },
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| 185 | { 'name' => "min_near_text",
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| 186 | 'desc' => "{W3ImgPlug.min_near_text}",
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| 187 | 'type' => "int",
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| 188 | 'deft' => "10",
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| 189 | 'reqd' => "no" },
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| 190 | { 'name' => "max_near_text",
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| 191 | 'desc' => "{W3ImgPlug.max_near_text}",
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| 192 | 'type' => "int",
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| 193 | 'deft' => "400",
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| 194 | 'reqd' => "no" },
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| 195 | { 'name' => "smallpage_threshold",
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| 196 | 'desc' => "{W3ImgPlug.smallpage_threshold}",
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| 197 | 'type' => "int",
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| 198 | 'deft' => "2048",
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| 199 | 'reqd' => "no" },
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| 200 | { 'name' => "textrefs_threshold",
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| 201 | 'desc' => "{W3ImgPlug.textrefs_threshold}",
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| 202 | 'type' => "int",
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| 203 | 'deft' => "2",
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| 204 | 'reqd' => "no" },
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| 205 | { 'name' => "caption_length",
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| 206 | 'desc' => "{W3ImgPlug.caption_length}",
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| 207 | 'type' => "int",
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| 208 | 'deft' => "80",
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| 209 | 'reqd' => "no" },
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| 210 | { 'name' => "neartext_length",
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| 211 | 'desc' => "{W3ImgPlug.neartext_length}",
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| 212 | 'type' => "int",
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| 213 | 'deft' => "300",
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| 214 | 'reqd' => "no" },
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| 215 | { 'name' => "document_text",
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| 216 | 'desc' => "{W3ImgPlug.document_text}",
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| 217 | 'type' => "flag",
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| 218 | 'reqd' => "no" } ];
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| 219 |
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| 220 | my $options = { 'name' => "W3ImgPlug",
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| 221 | 'desc' => "{W3ImgPlug.desc}",
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| 222 | 'abstract' => "no",
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| 223 | 'inherits' => "yes",
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| 224 | 'args' => $arguments };
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| 225 |
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| 226 |
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| 227 | # sub print_usage {
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| 228 | # print STDERR "\nUsage: plugin W3ImgPlug [options]\n\n";
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| 229 | # print STDERR " options:\n";
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| 230 | # print STDERR " -aggressiveness Range of related text extraction techniques to use [4]\n";
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| 231 | # print STDERR " 1: Filename, path, ALT text only\n";
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| 232 | # print STDERR " 2: All of 1, plus caption where available\n";
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| 233 | # print STDERR " 3: All of 2, plus near paragraphs where available\n";
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| 234 | # print STDERR " 4: All of 3, plus previous headers (<h1>, <h2>...)\n";
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| 235 | # print STDERR " where available\n";
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| 236 | # print STDERR " 5: All of 4, plus textual references where available\n";
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| 237 | # print STDERR " 6: All of 4, plus page metatags (title, keywords, etc)\n";
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| 238 | # print STDERR " 7: All of 6, 5 and 4 combined\n";
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| 239 | # print STDERR " 8: All of 7, plus repeat caption, filename, etc (raise \n";
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| 240 | # print STDERR " ranking of more relevant results)\n";
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| 241 | # print STDERR " 10: All of 1, plus full text of source page\n";
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| 242 | # print STDERR "\n";
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| 243 | # print STDERR " -no_cache_images Don't cache images (point to URL of original)\n";
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| 244 | # print STDERR " -index_pages Index the pages along with the images.\n";
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| 245 | # print STDERR " Otherwise reference the pages at the source URL\n";
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| 246 | # print STDERR " -min_size Bytes. Skip images smaller than this [2000]\n";
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| 247 | # print STDERR " -min_width Pixels. Skip images narrower than this [50 pixels]\n";
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| 248 | # print STDERR " -min_height Pixels. Skip images shorter than this [50 pixels]\n";
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| 249 | # print STDERR " -thumb_size Max thumbnail size. Both width and height [100 pixels]\n";
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| 250 | # print STDERR " -convert_params Additional parameters for ImageMagicK convert on\n";
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| 251 | # print STDERR " thumbnail creation. For example, '-raise' will give\n";
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| 252 | # print STDERR " a three dimensional effect to thumbnail images.\n";
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| 253 | # print STDERR " -document_text Add image text as document:text (otherwise IndexedText\n";
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| 254 | # print STDERR " metadata field)\n";
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| 255 | # print STDERR "\n";
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| 256 | # print STDERR " Advanced Options (applicability depends on aggressiveness level)\n";
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| 257 | # print STDERR " -smallpage_threshold Images on pages smaller than this (bytes) will have\n";
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| 258 | # print STDERR " the page (title, keywords, etc) meta-data added [2048]\n";
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| 259 | # print STDERR " -textrefs_threshold Threshold for textual references. Lower values mean\n";
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| 260 | # print STDERR " the algorithm is less strict [2]\n";
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| 261 | # print STDERR " -caption_length Maximum length of captions (in characters) [100]\n";
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| 262 | # print STDERR " -neartext_length Target length of near text (in characters) [300]\n";
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| 263 | # print STDERR " -max_near_text Maximum characters near images to extract [400]\n";
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| 264 | # print STDERR " -min_near_text Minimum characters of near text or caption to extract [10]\n";
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| 265 | # print STDERR "\n";
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| 266 | # print STDERR " Tag set configuration file (XML format):\n";
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| 267 | # print STDERR " <collectionpath>/etc/W3ImgPlug.cfg \n";
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| 268 | # print STDERR "\n";
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| 269 | # print STDERR "\n";
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| 270 | # print STDERR "W3ImgPlug inherits all of HTMLPlug's functionality and options:\n";
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| 271 | # HTMLPlug::print_usage();
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| 272 | # print STDERR "\n";
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| 273 | # }
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| 274 |
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| 275 | sub new {
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| 276 | my $class = shift (@_);
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| 277 | my $self = new HTMLPlug ($class, @_);
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| 278 | $self->{'plugin_type'} = "W3ImgPlug";
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| 279 | # 14-05-02 To allow for proper inheritance of arguments - John Thompson
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| 280 | my $option_list = $self->{'option_list'};
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| 281 | push( @{$option_list}, $options );
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| 282 |
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| 283 | if (!parsargv::parse(\@_,
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| 284 | q^aggressiveness/\d/3^, \$self->{'aggressiveness'},
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| 285 | q^index_pages^, \$self->{'index_pages'},
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| 286 | q^no_cache_images^, \$self->{'no_cache_images'},
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| 287 | q^min_size/\d*/2000^, \$self->{'min_img_filesize'},
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| 288 | q^min_width/\d*/50^, \$self->{'min_img_width'},
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| 289 | q^min_height/\d*/50^, \$self->{'min_img_height'},
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| 290 | q^thumb_size/\d*/100^, \$self->{'thumbnail_size'},
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| 291 | q^convert_params/.*/ ^, \$self->{'img_convert_param'},
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| 292 | q^max_near_text/\d*/400^, \$self->{'maxtext'},
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| 293 | q^min_near_text/\d*/10^, \$self->{'mintext'},
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| 294 | q^smallpage_threshold/\d*/2048^, \$self->{'smallpage_threshold'},
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| 295 | q^textrefs_threshold/\d*/2^, \$self->{'textref_threshold'},
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| 296 | q^caption_length/\d*/80^, \$self->{'caption_len'},
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| 297 | q^neartext_length/\d*/300^, \$self->{'neartext_len'},
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| 298 | q^document_text^, \$self->{'document_text'},
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| 299 | "allow_extra_options"
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| 300 | )) {
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| 301 |
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| 302 | print STDERR "\nIncorrect options passed to W3ImgPlug, check your collect.cfg configuration file\n";
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| 303 | $self->print_txt_usage(""); # Use default resource bundle
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| 304 | die "\n";
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| 305 | }
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| 306 |
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| 307 | # init class variables
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| 308 | $self->{'textref'} = undef; # init by read_file fn
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| 309 | $self->{'htdoc_obj'} = undef; # init by process fn
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| 310 | $self->{'htpath'} = undef; # init by process fn
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| 311 | $self->{'hturl'} = undef; # init by process fn
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| 312 | $self->{'plaintext'} = undef; # HTML stripped version - only init if needed by raw_neartext sub
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| 313 | $self->{'smallpage'} = 0; # set by process fn
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| 314 | $self->{'images_indexed'} = undef; # num of images indexed - if 1 or 2 then we know page is small
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| 315 | $self->{'initialised'} = undef; # flag (see set_extraction_options())
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| 316 |
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| 317 | return bless $self, $class;
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| 318 | }
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| 319 |
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| 320 | # if indexing pages, let HTMLPlug do it's stuff
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| 321 | # image extraction done through read()
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| 322 | sub process {
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| 323 | my ($self, $textref, $pluginfo, $base_dir, $file, $metadata, $doc_obj) = @_;
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| 324 | $self->{'imglist'} = ();
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| 325 | if ( $self->{'index_pages'} ) {
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| 326 | my $ok = $self->SUPER::process($textref, $pluginfo, $base_dir, $file, $metadata, $doc_obj);
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| 327 | if ( ! $ok ) { return $ok }
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| 328 | $self->{'htdoc_obj'} = $doc_obj;
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| 329 | }
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| 330 | # else use URL for referencing
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| 331 | #if ( $file =~ /(.*)[\/\\]/ ) { $self->{'htpath'} = $1; } else { $self->{'htpath'} = $file; }
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| 332 |
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| 333 | $self->{'htpath'} = $base_dir if (-d $base_dir);
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| 334 | if ( $file =~ /(.*)[\/\\]/ ) { $self->{'htpath'} .= "/$1"; }
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| 335 | $self->{'htpath'} =~ s/\\/\//g; # replace \ with /
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| 336 |
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| 337 | $self->{'hturl'} = "http://$file";
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| 338 | $self->{'hturl'} =~ s/\\/\//g; # for windows
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| 339 | ($self->{'filename'}) = $file =~ /.*[\/\\](.*)/;
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| 340 | ($self->{'base_path'}) = $file =~ /(.*)[\/\\]/i;
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| 341 | if ( ( -s "$base_dir/$file") <= $self->{'smallpage_threshold'} ) {
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| 342 | $self->{'smallpage'} = 1;
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| 343 | } else { $self->{'smallpage'} = 0; }
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| 344 |
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| 345 | if ( defined($self->{'initialised'}) ) { return 1; }
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| 346 | else {
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| 347 | $self->{'initialised'} = $self->set_extraction_options($base_dir =~ /^(.*?)\/import/i);
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| 348 | return $self->{'initialised'};
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| 349 | }
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| 350 | }
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| 351 |
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| 352 | # get complex configuration options from configuration files
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| 353 | # -- $GSDLCOLLECTION/etc/W3ImgPlug.cfg (tag sets for aggr 2+)
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| 354 | # -- $GSDLHOME/etc/packages/phind/stopword/en/brown.sw (stopwords for aggr 5+)
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| 355 |
|
|---|
| 356 | # If there's no W3ImgPlug.cfg file we'll use the following default values
|
|---|
| 357 | my $defaultcfg = '
|
|---|
| 358 | <delimitertagset>
|
|---|
| 359 | <setname>Caption</setname>
|
|---|
| 360 | <taggroup>font</taggroup>
|
|---|
| 361 | <taggroup>tt</taggroup>
|
|---|
| 362 | <taggroup>small</taggroup>
|
|---|
| 363 | <taggroup>b</taggroup>
|
|---|
| 364 | <taggroup>i</taggroup>
|
|---|
| 365 | <taggroup>u</taggroup>
|
|---|
| 366 | <taggroup>em</taggroup>
|
|---|
| 367 | <taggroup>td</taggroup>
|
|---|
| 368 | <taggroup>li</taggroup>
|
|---|
| 369 | <taggroup>a</taggroup>
|
|---|
| 370 | <taggroup>p</taggroup>
|
|---|
| 371 | <taggroup>tr</taggroup>
|
|---|
| 372 | <taggroup>center</taggroup>
|
|---|
| 373 | <taggroup>div</taggroup>
|
|---|
| 374 | <taggroup>caption</taggroup>
|
|---|
| 375 | <taggroup>br</taggroup>
|
|---|
| 376 | <taggroup>ul</taggroup>
|
|---|
| 377 | <taggroup>ol</taggroup>
|
|---|
| 378 | <taggroup>table</taggroup>
|
|---|
| 379 | <taggroup>hr</taggroup>
|
|---|
| 380 | </delimitertagset>
|
|---|
| 381 |
|
|---|
| 382 | <delimitertagset>
|
|---|
| 383 | <setname>Neartext</setname>
|
|---|
| 384 | <taggroup>tr|hr|table|h\d|img|body</taggroup>
|
|---|
| 385 | <taggroup>td|tr|hr|table|h\d|img|body</taggroup>
|
|---|
| 386 | <taggroup>p|br|td|tr|hr|table|h\d|img|body</taggroup>
|
|---|
| 387 | <taggroup>font|p|i|b|em|img</taggroup>
|
|---|
| 388 | </delimitertagset>
|
|---|
| 389 | ';
|
|---|
| 390 |
|
|---|
| 391 | sub set_extraction_options() {
|
|---|
| 392 | my ($self, $collpath) = @_;
|
|---|
| 393 | my ($filepath);
|
|---|
| 394 |
|
|---|
| 395 | print {$self->{'outhandle'}} "W3ImgPlug: Initialising\n"
|
|---|
| 396 | if $self->{'verbosity'} > 1;
|
|---|
| 397 | # etc/W3ImgPlug.cfg (XML)
|
|---|
| 398 | # tag sets for captions and neartext
|
|---|
| 399 | if ( $self->{'aggressiveness'} > 1 && $self->{'aggressiveness'} != 9 ) {
|
|---|
| 400 | $self->{'delims'} = [];
|
|---|
| 401 | $self->{'cdelims'} = [];
|
|---|
| 402 | my ($cfg, @tagsets, $tagset, $type, @delims);
|
|---|
| 403 |
|
|---|
| 404 | $filepath = "$collpath/etc/W3ImgPlug.cfg";
|
|---|
| 405 | if ( open CFG, "<$filepath" ) {
|
|---|
| 406 | while (<CFG>) { $cfg .= $_ }
|
|---|
| 407 | close CFG;
|
|---|
| 408 | } else {
|
|---|
| 409 | $cfg = $defaultcfg;
|
|---|
| 410 | }
|
|---|
| 411 |
|
|---|
| 412 | (@tagsets) =
|
|---|
| 413 | $cfg =~ /<delimitertagset>(.*?)<\/delimitertagset>/igs;
|
|---|
| 414 | foreach $tagset ( @tagsets ) {
|
|---|
| 415 | ($type) = $tagset =~ /<setname>(.*?)<\/setname>/i;
|
|---|
| 416 | if ( lc($type) eq "caption" ) {
|
|---|
| 417 | (@{$self->{'cdelims'}}) = $tagset =~ /<taggroup>(.*?)<\/taggroup>/igs;
|
|---|
| 418 | }
|
|---|
| 419 | elsif ( lc($type) eq "neartext" ) {
|
|---|
| 420 | (@{$self->{'delims'}}) = $tagset =~ /<taggroup>(.*?)<\/taggroup>/igs;
|
|---|
| 421 | }
|
|---|
| 422 | }
|
|---|
| 423 |
|
|---|
| 424 | # output a warning if there seem to be no delimiters
|
|---|
| 425 | if ( scalar(@{$self->{'cdelims'}} == 0)) {
|
|---|
| 426 | print {$self->{'outhandle'}} "W3ImgPlug: Warning: no caption delimiters found in $filepath\n";
|
|---|
| 427 | }
|
|---|
| 428 | if ( scalar(@{$self->{'delims'}} == 0)) {
|
|---|
| 429 | print {$self->{'outhandle'}} "W3ImgPlug: Warning: no neartext delimiters found in $filepath\n";
|
|---|
| 430 | }
|
|---|
| 431 | }
|
|---|
| 432 |
|
|---|
| 433 | # get stop words for textual reference extraction
|
|---|
| 434 | # TODO: warnings scroll off. Would be best to output them again at end of import
|
|---|
| 435 | if ( $self->{'aggressiveness'} >=5 && $self->{'aggressiveness'} != 9 ) {
|
|---|
| 436 | $self->{'stopwords'} = ();
|
|---|
| 437 | $filepath = &util::filename_cat($ENV{'GSDLHOME'}, "etc", "packages", "phind", "stopword", "en", "brown.sw");
|
|---|
| 438 | if ( open STOPWORDS, "<$filepath" ) {
|
|---|
| 439 | while ( <STOPWORDS> ) {
|
|---|
| 440 | chomp;
|
|---|
| 441 | $self->{'stopwords'}{$_} = 1;
|
|---|
| 442 | }
|
|---|
| 443 | close STOPWORDS;
|
|---|
| 444 | } else {
|
|---|
| 445 | print {$self->{'outhandle'}} "W3ImgPlug: Warning: couldn't open stopwords file at $filepath ($!)\n";
|
|---|
| 446 | }
|
|---|
| 447 |
|
|---|
| 448 | }
|
|---|
| 449 |
|
|---|
| 450 | if ( $self->{'neartext_len'} > $self->{'maxtext'} ) {
|
|---|
| 451 | $self->{'maxtext'} = $self->{'neartext_len'} * 1.33;
|
|---|
| 452 | print {$self->{'outhandle'}} "W3ImgPlug: Warning: adjusted max_text to $self->{'maxtext'}\n";
|
|---|
| 453 | }
|
|---|
| 454 | if ( $self->{'caption_len'} > $self->{'maxtext'} ) {
|
|---|
| 455 | $self->{'maxtext'} = $self->{'caption_len'} * 1.33;
|
|---|
| 456 | print {$self->{'outhandle'}} "W3ImgPlug: Warning: adjusted max_text to $self->{'maxtext'}\n";
|
|---|
| 457 | }
|
|---|
| 458 |
|
|---|
| 459 | return 1;
|
|---|
| 460 | }
|
|---|
| 461 |
|
|---|
| 462 | # return number of files processed, undef if can't process
|
|---|
| 463 | # Note that $base_dir might be "" and that $file might
|
|---|
| 464 | # include directories
|
|---|
| 465 | sub read {
|
|---|
| 466 | my ($self, $pluginfo, $base_dir, $file, $metadata, $processor, $maxdocs) = (@_);
|
|---|
| 467 | my ($doc_obj, $section, $filepath, $imgtag, $pos, $context, $numdocs, $tndir, $imgs);
|
|---|
| 468 | # forward normal read (runs HTMLPlug if index_pages T)
|
|---|
| 469 | my $ok = $self->SUPER::read($pluginfo, $base_dir, $file, $metadata, $processor, $maxdocs);
|
|---|
| 470 | if ( ! $ok ) { return $ok }
|
|---|
| 471 |
|
|---|
| 472 | my $outhandle = $self->{'outhandle'};
|
|---|
| 473 | my $textref = $self->{'textref'};
|
|---|
| 474 | my $htdoc_obj = $self->{'htdoc_obj'};
|
|---|
| 475 | $numdocs = 0;
|
|---|
| 476 | $base_dir =~ /(.*)\/.*/;
|
|---|
| 477 | $tndir = "$1/archives/thumbnails"; # TODO: this path shouldn't be hardcoded?
|
|---|
| 478 | &util::mk_all_dir($tndir) unless -e "$tndir";
|
|---|
| 479 |
|
|---|
| 480 | $imgs = \%{$self->{'imglist'}};
|
|---|
| 481 | my $nimgs = $self->get_img_list($textref);
|
|---|
| 482 | $self->{'images_indexed'} = $nimgs;
|
|---|
| 483 | if ( $nimgs > 0 ) {
|
|---|
| 484 | my @fplist = (sort { $imgs->{$a}{'pos'} <=> $imgs->{$b}{'pos'} } keys %{$imgs});
|
|---|
| 485 | my $i = 0;
|
|---|
| 486 | foreach $filepath ( @fplist ) {
|
|---|
| 487 | $pos = $imgs->{$filepath}{'pos'};
|
|---|
| 488 | $context = substr ($$textref, $pos - 50, $pos + 50); # grab context (quicker)
|
|---|
| 489 | ($imgtag) = ($context =~ /(<(?:img|a|body)\s[^>]*$filepath[^>]*>)/is );
|
|---|
| 490 | if (! defined($imgtag)) { $imgtag = $filepath }
|
|---|
| 491 | print $outhandle "W3ImgPlug: extracting $filepath\n"
|
|---|
| 492 | if ( $self->{'verbosity'} > 1 );
|
|---|
| 493 | $doc_obj = new doc ("", "indexed_doc");
|
|---|
| 494 | $section = $doc_obj->get_top_section();
|
|---|
| 495 | $prevpos = ( $i == 0 ? 0 : $imgs->{$fplist[$i - 1]}{'pos'});
|
|---|
| 496 | $nextpos = ( $i >= ($nimgs -1) ? -1 : $imgs->{$fplist[$i + 1]}{'pos'} );
|
|---|
| 497 |
|
|---|
| 498 | $self->extract_image_info($imgtag, $filepath, $textref, $doc_obj, $section, $tndir, $prevpos, $nextpos);
|
|---|
| 499 | $processor->process($doc_obj);
|
|---|
| 500 | $numdocs++;
|
|---|
| 501 | $i++;
|
|---|
| 502 | }
|
|---|
| 503 | return $numdocs;
|
|---|
| 504 | } else {
|
|---|
| 505 | print $outhandle "W3ImgPlug: No images from $file indexed\n"
|
|---|
| 506 | if ( $self->{'verbosity'} > 2 );
|
|---|
| 507 | return 1;
|
|---|
| 508 | }
|
|---|
| 509 |
|
|---|
| 510 | }
|
|---|
| 511 |
|
|---|
| 512 | # for every valid image tag
|
|---|
| 513 | # 1. extract related text and image metadata
|
|---|
| 514 | # 2. add this as document meta-data
|
|---|
| 515 | # 3. add assoc image(s) as files
|
|---|
| 516 | #
|
|---|
| 517 | sub extract_image_info {
|
|---|
| 518 | my $self = shift (@_);
|
|---|
| 519 | my ($tag, $id, $textref, $doc_obj, $section, $tndir, $prevpos, $nextpos) = (@_);
|
|---|
| 520 | my ($filename, $orig_fp, $fn, $ext, $reltext, $relreltext, $crcid, $imgs,
|
|---|
| 521 | $thumbfp, $pagetitle, $alttext, $filepath, $aggr);
|
|---|
| 522 | $aggr = $self->{'aggressiveness'};
|
|---|
| 523 | $imgs = \%{$self->{'imglist'}};
|
|---|
| 524 | $filepath = $imgs->{$id}{'relpath'};
|
|---|
| 525 | ($filename) = $filepath =~ /([^\/\\]+)$/s;
|
|---|
| 526 | ($orig_fp) = "$self->{'base_path'}/$filepath";
|
|---|
| 527 | $orig_fp =~ tr/+/ /;
|
|---|
| 528 | $orig_fp =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C", hex($1))/eg; # translate %2E to space, etc
|
|---|
| 529 | $orig_fp =~ s/\\/\//g;
|
|---|
| 530 | $filepath = "$self->{'htpath'}/$filepath";
|
|---|
| 531 | ($onlyfn) = $filename =~ /([^\\\/]*)$/;
|
|---|
| 532 | ($fn, $ext) = $onlyfn =~ /(.*)\.(.*)/;
|
|---|
| 533 | $fn = lc $fn; $ext = lc $ext;
|
|---|
| 534 | ($reltext) = "<tr><td>GifComment</td><td>" . `identify $filepath -ping -format "%c"` . "</td></tr>\n"
|
|---|
| 535 | if ($ext eq "gif");
|
|---|
| 536 | $reltext .= "<tr><td>FilePath</td><td>$orig_fp</td></tr>\n";
|
|---|
| 537 |
|
|---|
| 538 | if ($ENV{'GSDLOS'} =~ /^windows$/i) {
|
|---|
| 539 | $crcid = "$fn.$ext." . $self->{'next_crcid'}++;
|
|---|
| 540 | } else { ($crcid) = `cksum $filepath` =~ /^(\d+)/; }
|
|---|
| 541 | $thumbfp = "$tndir/tn_$crcid.jpg";
|
|---|
| 542 | `convert -flatten -filter Hanning $self->{'img_convert_param'} -geometry "$self->{'thumbnail_size'}x$self->{'thumbnail_size'}>" $filepath $thumbfp` unless -e $thumbfp;
|
|---|
| 543 | if ( ! (-e $thumbfp) ) {
|
|---|
| 544 | print STDERR "W3ImgPlug: 'convert' failed. Check ImageMagicK binaries are installed and working correctly\n"; return 0;
|
|---|
| 545 | }
|
|---|
| 546 |
|
|---|
| 547 | # shove in full text (tag stripped or unstripped) if settings require it
|
|---|
| 548 | if ( $aggr == 10) {
|
|---|
| 549 | $reltext = "<tr><td>AllPage</td><td>" . $$textref . "</td><tr>\n"; # level 10 (all text, verbatim)
|
|---|
| 550 | } else {
|
|---|
| 551 | $pagetitle = $self->get_meta_value("title", $textref);
|
|---|
| 552 | ($alttext) = $tag =~ /\salt\s*=\s*(?:\"|\')(.+?)(?:\"|\')/is;
|
|---|
| 553 | if ( defined($alttext) && length($alttext) > 1) {
|
|---|
| 554 | $reltext .= "<tr><td>ALTtext</td><td>$alttext</td></tr>\n"; }
|
|---|
| 555 | $reltext .= "<tr><td>SplitCapitalisation</td><td>" .
|
|---|
| 556 | $self->split_filepath($orig_fp) . "</td></tr>\n";
|
|---|
| 557 |
|
|---|
| 558 | # get caption/tag based near text (if appropriate)
|
|---|
| 559 | if ( $aggr > 1 ) {
|
|---|
| 560 | if ( $aggr >= 2 ) {
|
|---|
| 561 | $reltext .=
|
|---|
| 562 | $self->extract_caption_text($tag, $textref, $prevpos, $imgs->{$id}{'pos'}, $nextpos);
|
|---|
| 563 | $relreltext = $reltext;
|
|---|
| 564 | }
|
|---|
| 565 | # repeat the filepath, alt-text, caption, etc
|
|---|
| 566 | if ( $aggr == 8 ) {
|
|---|
| 567 | $reltext .= $relreltext;
|
|---|
| 568 | }
|
|---|
| 569 | if ( $aggr >= 3 ) {
|
|---|
| 570 | $reltext .=
|
|---|
| 571 | $self->extract_near_text($tag, $textref, $prevpos, $imgs->{$id}{'pos'}, $nextpos);
|
|---|
| 572 | }
|
|---|
| 573 |
|
|---|
| 574 | # get page metadata (if appropriate)
|
|---|
| 575 | if ( $aggr >= 6 || ( $aggr >= 2 &&
|
|---|
| 576 | ( $self->{'images_indexed'} < 2 ||
|
|---|
| 577 | ($self->{'smallpage'} == 1 && $self->{'images_indexed'} < 6 )))) {
|
|---|
| 578 | $reltext .= $self->get_page_metadata($textref);
|
|---|
| 579 | }
|
|---|
| 580 | # textual references
|
|---|
| 581 | if ( $aggr == 5 || $aggr >= 7) {
|
|---|
| 582 | if ( length($relreltext) > ($self->{'caption_len'} * 2) ) {
|
|---|
| 583 | $reltext .= $self->get_textrefs($relreltext, $textref, $prevpos, $imgs->{$id}{'pos'}, $nextpos); }
|
|---|
| 584 | else {
|
|---|
| 585 | $reltext .= $self->get_textrefs($reltext, $textref, $prevpos, $imgs->{$id}{'pos'}, $nextpos);
|
|---|
| 586 | }
|
|---|
| 587 | }
|
|---|
| 588 | } # aggr > 1
|
|---|
| 589 | } # aggr != 10
|
|---|
| 590 |
|
|---|
| 591 | $doc_obj->set_OID($crcid);
|
|---|
| 592 | $doc_obj->associate_file($thumbfp, "$fn.thumb.jpg", undef, $section);
|
|---|
| 593 | $doc_obj->add_metadata($section, "OriginalFilename", $filename);
|
|---|
| 594 | $doc_obj->add_metadata($section, "FilePath", $orig_fp);
|
|---|
| 595 | $doc_obj->add_metadata($section, "Filename", $fn);
|
|---|
| 596 | $doc_obj->add_metadata($section, "FileExt", $ext);
|
|---|
| 597 | $doc_obj->add_metadata($section, "FileSize", $imgs->{$id}{'filesize'});
|
|---|
| 598 | $doc_obj->add_metadata($section, "Width", $imgs->{$id}{'width'});
|
|---|
| 599 | $doc_obj->add_metadata($section, "Height", $imgs->{$id}{'height'});
|
|---|
| 600 | $doc_obj->add_metadata($section, "URL", "http://$orig_fp");
|
|---|
| 601 | $doc_obj->add_metadata($section, "PageURL", $self->{'hturl'});
|
|---|
| 602 | $doc_obj->add_metadata($section, "PageTitle", $pagetitle);
|
|---|
| 603 | $doc_obj->add_metadata($section, "ThumbURL",
|
|---|
| 604 | "_httpcollection_/index/assoc/[archivedir]/$fn.thumb.jpg");
|
|---|
| 605 |
|
|---|
| 606 | if ( $self->{'document_text'} ) {
|
|---|
| 607 | $doc_obj->add_utf8_text($section, "<table border=1>\n$reltext</table>");
|
|---|
| 608 | } else {
|
|---|
| 609 | $doc_obj->add_metadata($section, "ImageText", "<table border=1>\n$reltext</table>\n");
|
|---|
| 610 | }
|
|---|
| 611 |
|
|---|
| 612 | if ( $self->{'index_pages'} ) {
|
|---|
| 613 | my ($cache_url) = "_httpdoc_&d=" . $self->{'htdoc_obj'}->get_OID();
|
|---|
| 614 | if ( $imgs->{$id}{'anchored'} ) {
|
|---|
| 615 | my $a_name = $id;
|
|---|
| 616 | $a_name =~ s/[\/\\\:\&]/_/g;
|
|---|
| 617 | $cache_url .= "#gsdl_$a_name" ;
|
|---|
| 618 | }
|
|---|
| 619 | $doc_obj->add_utf8_metadata($section, "CachePageURL", $cache_url);
|
|---|
| 620 | }
|
|---|
| 621 | if ( ! $self->{'no_cache_images'} ) {
|
|---|
| 622 | $onlyfn = lc $onlyfn;
|
|---|
| 623 | $doc_obj->associate_file($filepath, $onlyfn, undef, $section);
|
|---|
| 624 | $doc_obj->add_utf8_metadata($section, "CacheURL",
|
|---|
| 625 | "_httpcollection_/index/assoc/[archivedir]/$onlyfn");
|
|---|
| 626 | }
|
|---|
| 627 | return 1;
|
|---|
| 628 | }
|
|---|
| 629 |
|
|---|
| 630 | sub get_page_metadata {
|
|---|
| 631 | my ($self, $textref) = (@_);
|
|---|
| 632 | my (@rval);
|
|---|
| 633 | $rval[0] = $self->get_meta_value("title", $textref);
|
|---|
| 634 | $rval[1] = $self->get_meta_value("keywords", $textref);
|
|---|
| 635 | $rval[2] = $self->get_meta_value("description", $textref);
|
|---|
| 636 | $rval[3] = $self->{'filename'};
|
|---|
| 637 |
|
|---|
| 638 | return wantarray ? @rval : "<tr><td>PageMeta</td><td>@rval</td></tr>\n" ;
|
|---|
| 639 | }
|
|---|
| 640 |
|
|---|
| 641 | # turns LargeCatFish into Large,Cat,Fish so MG sees the separate words
|
|---|
| 642 | sub split_filepath {
|
|---|
| 643 | my ($self, $filepath) = (@_);
|
|---|
| 644 | my (@words) = $filepath =~ /([A-Z][a-z]+)/g;
|
|---|
| 645 | return join(',', @words);
|
|---|
| 646 | }
|
|---|
| 647 |
|
|---|
| 648 | # finds and extracts sentences
|
|---|
| 649 | # that seem to be on the same topic
|
|---|
| 650 | # as other related text (correlations)
|
|---|
| 651 | # and textual references (e.g. in figure 3 ...)
|
|---|
| 652 | sub get_textrefs {
|
|---|
| 653 | my ($self, $reltext, $textref, $prevpos, $pos, $nextpos) = (@_);
|
|---|
| 654 | my ($maxtext, $mintext, $startpos, $context_size, $context);
|
|---|
| 655 |
|
|---|
| 656 | my (@relwords, @refwords, %sentences, @pagemeta);
|
|---|
| 657 |
|
|---|
| 658 | # extract larger context
|
|---|
| 659 | $maxtext = $self->{'maxtext'};
|
|---|
| 660 | $startpos = $pos - ($maxtext * 4);
|
|---|
| 661 | $context_size = $maxtext*10;
|
|---|
| 662 | if ($startpos < $prevpos ) { $startpos = $prevpos }
|
|---|
| 663 | if ($nextpos != -1 && $context_size > ( $nextpos - $startpos )) { $context_size = ($nextpos - $startpos) }
|
|---|
| 664 | $context = substr ( $$textref, $startpos, $context_size );
|
|---|
| 665 | $context =~ s/<.*?>//gs;
|
|---|
| 666 | $context =~ s/^.*>(.*)/$1/gs;
|
|---|
| 667 | $context =~ s/(.*)<.*$/$1/gs;
|
|---|
| 668 |
|
|---|
| 669 | # get page meta-data (if not already included)
|
|---|
| 670 | if ( $self->{'aggressiveness'} == 5 && ! $self->{'smallpage'} ) {
|
|---|
| 671 | @pagemeta = $self->get_page_metadata($textref);
|
|---|
| 672 | foreach $value ( @pagemeta ) {
|
|---|
| 673 | $context .= "$value."; # make each into psuedo-sentence
|
|---|
| 674 | }
|
|---|
| 675 | }
|
|---|
| 676 |
|
|---|
| 677 | # TODO: this list is not exhaustive
|
|---|
| 678 | @refwords = ( '(?:is|are)? ?(?:show(?:s|n)|demonstrate(?:d|s)|explains|features) (?:in|by|below|above|here)',
|
|---|
| 679 | '(?:see)? (?:figure|table)? (?:below|above)');
|
|---|
| 680 |
|
|---|
| 681 | # extract general references
|
|---|
| 682 | foreach $rw ( @refwords ) {
|
|---|
| 683 | while ( $context =~ /[\.\?\!\,](.*?$rw\W.*?[\.\?\!\,])/ig ) {
|
|---|
| 684 | $sentence = $1;
|
|---|
| 685 | $sentence =~ s/\s+/ /g;
|
|---|
| 686 | $sentences{$sentence}+=2;
|
|---|
| 687 | }
|
|---|
| 688 | }
|
|---|
| 689 | # extract specific (figure, table) references by number
|
|---|
| 690 | my ($fignum) = $context =~ /[\.\?\!].*?(?:figure|table)s?[\-\_\ \.](\d+\w*)\W.*?[\.\?\!]/ig;
|
|---|
| 691 | if ( $fignum ) {
|
|---|
| 692 | foreach $rw ( @refwords ) {
|
|---|
| 693 | while ( $context =~ /[\.\?\!](.*?(figure|table)[\-\_\ \.]$fignum\W.*?[\.\?\!])/ig ) {
|
|---|
| 694 | $sentence = $1;
|
|---|
| 695 | $sentence =~ s/\s+/ /g;
|
|---|
| 696 | $sentences{$sentence}+=4;
|
|---|
| 697 | }
|
|---|
| 698 | }
|
|---|
| 699 | }
|
|---|
| 700 |
|
|---|
| 701 | # sentences with occurances of important words
|
|---|
| 702 | @relwords = $reltext =~ /([a-zA-Z]{4,})/g; # take out small words
|
|---|
| 703 | foreach $word ( @relwords ) {
|
|---|
| 704 | if ( $self->{'stopwords'}{$word} ) { next } # skip stop words
|
|---|
| 705 | while ( $context =~ /([^\.\?\!]*?$word\W.*?[\.\?\!])/ig ) {
|
|---|
| 706 | $sentence = $1;
|
|---|
| 707 | $sentence =~ s/\s+/ /g;
|
|---|
| 708 | $sentences{$sentence}++;
|
|---|
| 709 | }
|
|---|
| 710 | }
|
|---|
| 711 | foreach $sentence ( keys %sentences ) {
|
|---|
| 712 | if ($sentences{$sentence} < $self->{'textref_threshold'}) {
|
|---|
| 713 | delete $sentences{$sentence};
|
|---|
| 714 | }
|
|---|
| 715 | }
|
|---|
| 716 | my ($rval) = join "<br>\n", (keys %sentences);
|
|---|
| 717 | if ( $rval && length($rval) > 5 ) {
|
|---|
| 718 | return ( "<tr><td>TextualReferences</td><td>" . $rval . "</td></tr>\n") }
|
|---|
| 719 | else { return "" }
|
|---|
| 720 | }
|
|---|
| 721 |
|
|---|
| 722 | # handles caption extraction
|
|---|
| 723 | # calling the extractor with different
|
|---|
| 724 | # tags and choosing the best candidate caption
|
|---|
| 725 | sub extract_caption_text {
|
|---|
| 726 | my ($self, $tag, $textref, $prevpos, $pos, $nextpos) = (@_);
|
|---|
| 727 | my (@neartext, $len, $hdelim, $goodlen,
|
|---|
| 728 | $startpos, $context, $context_size);
|
|---|
| 729 |
|
|---|
| 730 | $mintext = $self->{'mintext'};
|
|---|
| 731 | $goodlen = $self->{'caption_len'};
|
|---|
| 732 |
|
|---|
| 733 | # extract a context to extract near text from (faster)
|
|---|
| 734 | $context_size = $self->{'maxtext'}*3;
|
|---|
| 735 | $startpos = $pos - ($context_size / 2);
|
|---|
| 736 | if ($startpos < $prevpos ) { $startpos = $prevpos }
|
|---|
| 737 | if ($nextpos != -1 && $context_size > ( $nextpos - $startpos ))
|
|---|
| 738 | { $context_size = ($nextpos - $startpos) }
|
|---|
| 739 |
|
|---|
| 740 | $context = substr ( $$textref, $startpos, $context_size );
|
|---|
| 741 | $context =~ s/<!--.*?-->//gs;
|
|---|
| 742 | $context =~ s/^.*-->(.*)/$1/gs;
|
|---|
| 743 | $context =~ s/(.*)<!--.*$/$1/gs;
|
|---|
| 744 |
|
|---|
| 745 | # try stepping through markup delimiter sets
|
|---|
| 746 | # and selecting the best one
|
|---|
| 747 | foreach $hdelim ( @{ $self->{'cdelims'} } ) {
|
|---|
| 748 | @neartext = $self->extract_caption($tag, $hdelim, \$context);
|
|---|
| 749 | $len = length(join("", @neartext));
|
|---|
| 750 | last if ($len >= $mintext && $len <= $goodlen);
|
|---|
| 751 | }
|
|---|
| 752 | # reject if well over reasonable length
|
|---|
| 753 | if ( $len > $goodlen ) {
|
|---|
| 754 | @neartext = [];
|
|---|
| 755 | }
|
|---|
| 756 | $neartext[0] = " " if (! defined $neartext[0]);
|
|---|
| 757 | $neartext[1] = " " if (! defined $neartext[1]);
|
|---|
| 758 | return "<tr><td>Caption</td><td>" . (join ",", @neartext) . "</td></tr>\n"; # TODO: the | is for testing purposes
|
|---|
| 759 | } # end extract_caption_text
|
|---|
| 760 |
|
|---|
| 761 | # the previous section header often gives a bit
|
|---|
| 762 | # of context to the section that the image is
|
|---|
| 763 | # in (invariably the header is before/above the image)
|
|---|
| 764 | # so extract the text of the closest header above the image
|
|---|
| 765 | #
|
|---|
| 766 | # this fn just gets all the headers above the image, within the context window
|
|---|
| 767 | sub get_prev_header {
|
|---|
| 768 | my ($self, $pos, $textref) = (@_);
|
|---|
| 769 | my ($rhtext);
|
|---|
| 770 | while ( $$textref =~ /<h\d>(.*?)<\/h\d>/sig ) {
|
|---|
| 771 | # only headers before image
|
|---|
| 772 | if ((pos $$textref) < $pos) {
|
|---|
| 773 | $rhtext .= "$1, ";
|
|---|
| 774 | }
|
|---|
| 775 | }
|
|---|
| 776 | if ( $rhtext ) { return "Header($rhtext)" }
|
|---|
| 777 | else { return "" }
|
|---|
| 778 | }
|
|---|
| 779 |
|
|---|
| 780 | # not the most robust tag stripping
|
|---|
| 781 | # regexps (see perl.com FAQ) but good enough
|
|---|
| 782 | #
|
|---|
| 783 | # used by caption & tag-based near text algorithms
|
|---|
| 784 | sub strip_tags {
|
|---|
| 785 | my ( $self, $value ) = @_;
|
|---|
| 786 | if ( ! defined($value) ) { $value = "" } # handle nulls
|
|---|
| 787 | else {
|
|---|
| 788 | $value =~ s/<.*?>//gs; # strip all html tags
|
|---|
| 789 | $value =~ s/\s+/\ /g; # remove extra whitespace
|
|---|
| 790 | $value =~ s/\&\w+\;//g; # remove etc
|
|---|
| 791 | }
|
|---|
| 792 | return $value;
|
|---|
| 793 | }
|
|---|
| 794 |
|
|---|
| 795 | # uses the given tag(s) to identify
|
|---|
| 796 | # the caption near to the image
|
|---|
| 797 | # (below, above or both below and above)
|
|---|
| 798 | sub extract_caption {
|
|---|
| 799 | my ($self, $tag, $bound_tag, $contextref) = (@_);
|
|---|
| 800 | my (@nt, $n, $etag, $gotcap);
|
|---|
| 801 | return ("", "") if ( ! ($$contextref =~ /\Q$tag/) );
|
|---|
| 802 |
|
|---|
| 803 | $nt[0] = $`;
|
|---|
| 804 | $nt[1] = $';
|
|---|
| 805 | $gotcap = 0;
|
|---|
| 806 |
|
|---|
| 807 | # look before the image for a boundary tag
|
|---|
| 808 | ($etag, $nt[0]) = $nt[0] =~ /<($bound_tag)[\s]?.*?>(.*?)$/is;
|
|---|
| 809 | # if bound_tag too far from the image, then prob not caption
|
|---|
| 810 | # (note: have to allow for tags, so multiply by 3
|
|---|
| 811 | if ( $etag && length($nt[0]) < ($self->{'caption_len'} * 3) ) {
|
|---|
| 812 | if ( $nt[0] =~ /<\/$etag>/si ) {
|
|---|
| 813 | # the whole caption is above the image: <tag>text</tag><img>
|
|---|
| 814 | ($nt[0]) =~ /<(?:$etag)[\s]?.*?>(.*?)<\/$etag>/is;
|
|---|
| 815 | $nt[0] = $self->strip_tags($nt[0]);
|
|---|
| 816 | if ( length($nt[0]) > $self->{'mintext'} ) {
|
|---|
| 817 | $gotcap = 1;
|
|---|
| 818 | $nt[1] = "";
|
|---|
| 819 | }
|
|---|
| 820 |
|
|---|
| 821 | } elsif ( $nt[1] =~ /<\/$etag>/si) {
|
|---|
| 822 | # the caption tag covers image: <tag>text?<img>text?</tag>
|
|---|
| 823 | ($nt[1]) = $nt[1] =~ /(.*?)<\/$etag>/si;
|
|---|
| 824 | $nt[0] = $self->strip_tags($nt[0] . $nt[1]);
|
|---|
| 825 | if ( length($nt[0]) > $self->{'mintext'} ) {
|
|---|
| 826 | $gotcap = 2;
|
|---|
| 827 | $nt[1] = "";
|
|---|
| 828 | }
|
|---|
| 829 | }
|
|---|
| 830 | }
|
|---|
| 831 | # else try below the image
|
|---|
| 832 | if ( ! $gotcap ) {
|
|---|
| 833 | # the caption is after the image: <img><tag>text</tag>
|
|---|
| 834 | ($etag, $nt[1]) = $nt[1] =~ /^.*?<($bound_tag)[\s]?.*?>(.*)/is;
|
|---|
| 835 | if ( $etag && $nt[1] =~ /<\/$etag>/s) {
|
|---|
| 836 | ($nt[1]) = $nt[1] =~ /(.*?)<\/$etag>/si;
|
|---|
| 837 | $gotcap = 3;
|
|---|
| 838 | $nt[0] = "";
|
|---|
| 839 | $nt[1] = $self->strip_tags($nt[1]);
|
|---|
| 840 | }
|
|---|
| 841 | }
|
|---|
| 842 | if ( ! $gotcap ) { $nt[0] = $nt[1] = "" }
|
|---|
| 843 | else {
|
|---|
| 844 | # strip part-tags
|
|---|
| 845 | $nt[0] =~ s/^.*>//s;
|
|---|
| 846 | $nt[1] =~ s/<.*$//s;
|
|---|
| 847 | }
|
|---|
| 848 | my ($type);
|
|---|
| 849 | if ( $gotcap == 0 ) { return ("nocaption", "") }
|
|---|
| 850 | elsif ( $gotcap == 1 ) { $type = "captionabove:" }
|
|---|
| 851 | elsif ( $gotcap == 2 ) { $type = "captioncovering:" }
|
|---|
| 852 | elsif ( $gotcap == 3 ) { $type = "captionbelow:" }
|
|---|
| 853 | return ($type, $nt[0], $nt[1]);
|
|---|
| 854 | }
|
|---|
| 855 |
|
|---|
| 856 | # tag-based near text
|
|---|
| 857 | #
|
|---|
| 858 | # tries different tag sets
|
|---|
| 859 | # and chooses the best one
|
|---|
| 860 | sub extract_near_text {
|
|---|
| 861 | my ($self, $tag, $textref, $prevpos, $pos, $nextpos) = (@_);
|
|---|
| 862 | my (@neartext, $len, $hdelim, $maxtext, $mintext, $goodlen,
|
|---|
| 863 | @bestlen, @best, $startpos, $context, $context_size,
|
|---|
| 864 | $dist, $bdist, $best1, $i, $nt);
|
|---|
| 865 | $bestlen[0] = $bestlen[1] = 0; $bestlen[2] = $bdist = 999999;
|
|---|
| 866 | $best[0] = $best[1] = $best[2] = "";
|
|---|
| 867 | $maxtext = $self->{'maxtext'};
|
|---|
| 868 | $mintext = $self->{'mintext'};
|
|---|
| 869 | $goodlen = $self->{'neartext_len'};
|
|---|
| 870 |
|
|---|
| 871 | # extract a context to extract near text from (faster)
|
|---|
| 872 | $context_size = $maxtext*4;
|
|---|
| 873 | $startpos = $pos - ($context_size / 2);
|
|---|
| 874 | if ($startpos < $prevpos ) { $startpos = $prevpos }
|
|---|
| 875 | if ($nextpos != -1 && $context_size > ( $nextpos - $startpos ))
|
|---|
| 876 | { $context_size = ($nextpos - $startpos) }
|
|---|
| 877 | $context = substr ( $$textref, $startpos, $context_size );
|
|---|
| 878 | $context =~ s/<!--.*?-->//gs;
|
|---|
| 879 | $context =~ s/^.*-->(.*)/$1/gs;
|
|---|
| 880 | $context =~ s/(.*)<!--.*$/$1/gs;
|
|---|
| 881 |
|
|---|
| 882 | # try stepping through markup delimiter sets
|
|---|
| 883 | # and selecting the best one
|
|---|
| 884 | foreach $hdelim ( @{ $self->{'delims'} } ) {
|
|---|
| 885 | @neartext = $self->extract_tagged_neartext($tag, $hdelim, \$context);
|
|---|
| 886 | $nt = join("", @neartext);
|
|---|
| 887 | $len = length($nt);
|
|---|
| 888 | # Priorities:
|
|---|
| 889 | # 1. Greater than mintext
|
|---|
| 890 | # 2. Less than maxtext
|
|---|
| 891 | # 3. Closest to goodlen
|
|---|
| 892 | if ( $len <= $goodlen && $len > $bestlen[0] ) {
|
|---|
| 893 | $bestlen[0] = $len;
|
|---|
| 894 | $best[0] = $hdelim;
|
|---|
| 895 | } elsif ( $len >= $maxtext && $len < $bestlen[2] ) {
|
|---|
| 896 | $bestlen[2] = $len;
|
|---|
| 897 | $best[2] = $hdelim;
|
|---|
| 898 | } elsif ( $len >= $bestlen[0] && $len <= $bestlen[2] ) {
|
|---|
| 899 | $dist = abs($goodlen - $len);
|
|---|
| 900 | if ( $dist < $bdist ) {
|
|---|
| 901 | $bestlen[1] = $len;
|
|---|
| 902 | $best[1] = $hdelim;
|
|---|
| 903 | $bdist = $dist;
|
|---|
| 904 | }
|
|---|
| 905 | }
|
|---|
| 906 | }
|
|---|
| 907 | $best1 = 2;
|
|---|
| 908 | foreach $i ( 0..2 ) {
|
|---|
| 909 | if ( $bestlen[$i] == 999999 ) { $bestlen[$i] = 0 }
|
|---|
| 910 | $dist = abs($goodlen - $bestlen[$i]);
|
|---|
| 911 | if ( $bestlen[$i] > $mintext && $dist <= $bdist ) {
|
|---|
| 912 | $best1 = $i;
|
|---|
| 913 | $bdist = $dist;
|
|---|
| 914 | }
|
|---|
| 915 | }
|
|---|
| 916 | @neartext = $self->extract_tagged_neartext($tag, $best[$best1], \$context);
|
|---|
| 917 | if ( $bestlen[$best1] > $maxtext ) {
|
|---|
| 918 | # truncate on word boundary if too much text
|
|---|
| 919 | my $hmax = $maxtext / 2;
|
|---|
| 920 | ($neartext[0]) = $neartext[0] =~ /([^\s]*.{1,$hmax})$/s;
|
|---|
| 921 | ($neartext[1]) = $neartext[1] =~ /^(.{1,$hmax}[^\s]*)/s;
|
|---|
| 922 | } elsif ( $bestlen[$best1] < $mintext ) {
|
|---|
| 923 | # use plain text extraction if tags failed (e.g. usable tag outside context)
|
|---|
| 924 | print {$self->{'outhandle'}} "W3ImgPlug: Fallback to plain-text extraction for $tag\n"
|
|---|
| 925 | if $self->{'verbosity'} > 2;
|
|---|
| 926 | $neartext[0] = "<tr><td>RawNeartext</td><td>" . $self->extract_raw_neartext($tag, $textref) . "</td></tr>";
|
|---|
| 927 | $neartext[1] = "";
|
|---|
| 928 | }
|
|---|
| 929 | # get previous header if available
|
|---|
| 930 | $neartext[0] .= "<br>\n" .
|
|---|
| 931 | $self->get_prev_header($pos, \$context) if ( $self->{'aggressiveness'} >= 4 );
|
|---|
| 932 | $neartext[0] = " " if (! defined $neartext[0]);
|
|---|
| 933 | $neartext[1] = " " if (! defined $neartext[1]);
|
|---|
| 934 |
|
|---|
| 935 | return "<tr><td>NearText</td><td>" . (join "|", @neartext) . "</td></tr>\n"; # TODO: the | is for testing purposes
|
|---|
| 936 | } # end extract_near_text
|
|---|
| 937 |
|
|---|
| 938 | # actually captures tag-based
|
|---|
| 939 | # near-text given a tag set
|
|---|
| 940 | sub extract_tagged_neartext {
|
|---|
| 941 | my ($self, $tag, $bound_tag, $textref) = (@_);
|
|---|
| 942 | return "" if ( ! ($$textref =~ /\Q$tag/) );
|
|---|
| 943 | my (@nt, $delim, $pre_tag, $n);
|
|---|
| 944 | $nt[0] = $`;
|
|---|
| 945 | $nt[1] = $';
|
|---|
| 946 |
|
|---|
| 947 | # get text after previous image tag
|
|---|
| 948 | $nt[0] =~ s/.*<($bound_tag)[^>]*>(.*)/$2/is; # get rid of preceding text
|
|---|
| 949 | if (defined($1)) { $delim = $1 }
|
|---|
| 950 | $pre_tag = $bound_tag;
|
|---|
| 951 |
|
|---|
| 952 | if (defined($delim)) {
|
|---|
| 953 | # we want to try and use the end tag of the previous delimiter
|
|---|
| 954 | # (put it on the front of the list)
|
|---|
| 955 | $pre_tag =~ s/(^|\|)($delim)($|\|)//i; # take it out
|
|---|
| 956 | $pre_tag =~ s/\|\|/\|/i; # replace || with |
|
|---|
| 957 | $pre_tag = $delim . "|" . $pre_tag; # put it on the front
|
|---|
| 958 | }
|
|---|
| 959 |
|
|---|
| 960 | # get text before next image tag
|
|---|
| 961 | $nt[1] =~ s/<\/?(?:$pre_tag)[^>]*>.*//is; # get rid of stuff after first delimiter
|
|---|
| 962 |
|
|---|
| 963 | # process related text
|
|---|
| 964 | for $n (0..1) {
|
|---|
| 965 | if ( defined($nt[$n]) ) {
|
|---|
| 966 | $nt[$n] =~ s/<.*?>//gs; # strip all html tags
|
|---|
| 967 | $nt[$n] =~ s/\s+/\ /gs; # remove extra whitespace
|
|---|
| 968 | $nt[$n] =~ s/\&\w+\;//sg; # remove etc
|
|---|
| 969 | # strip part-tags
|
|---|
| 970 | if ( $n == 0 ) { $nt[0] =~ s/^.*>//s }
|
|---|
| 971 | if ( $n == 1 ) { $nt[1] =~ s/<.*$//s }
|
|---|
| 972 | } else { $nt[$n] = ""; } # handle nulls
|
|---|
| 973 | }
|
|---|
| 974 | return @nt;
|
|---|
| 975 | }
|
|---|
| 976 |
|
|---|
| 977 | # this function is fall-back
|
|---|
| 978 | # if tags aren't suitable.
|
|---|
| 979 | #
|
|---|
| 980 | # extracts a fixed length of characters
|
|---|
| 981 | # either side of image tag (on word boundary)
|
|---|
| 982 | sub extract_raw_neartext {
|
|---|
| 983 | my ($self, $tag, $textref) = (@_);
|
|---|
| 984 | my ($rawtext, $startpos, $fp);
|
|---|
| 985 | my $imgs = \%{$self->{'imglist'}};
|
|---|
| 986 | ($fp) = $tag =~ /([\w\\\/]+\.(?:gif|jpe?g|png))/is;
|
|---|
| 987 | if (! $fp) { return " " };
|
|---|
| 988 | # if the cached, plain-text version isn't there, then create it
|
|---|
| 989 | $self->init_plaintext($textref) unless defined($self->{'plaintext'});
|
|---|
| 990 |
|
|---|
| 991 | # take the closest maxtext/2 characters
|
|---|
| 992 | # either side of the tag (by word boundary)
|
|---|
| 993 | return "" if ( ! exists $imgs->{$fp}{'rawpos'} );
|
|---|
| 994 | $startpos = $imgs->{$fp}{'rawpos'} - (($self->{'maxtext'} / 2) + 20);
|
|---|
| 995 | if ( $startpos < 0 ) { $startpos = 0 }
|
|---|
| 996 | $rawtext = substr $self->{'plaintext'}, $startpos, $self->{'maxtext'} + 20;
|
|---|
| 997 | $rawtext =~ s/\s\s/ /g;
|
|---|
| 998 |
|
|---|
| 999 | return $rawtext;
|
|---|
| 1000 | }
|
|---|
| 1001 |
|
|---|
| 1002 | # init plaintext variable for HTML-stripped version
|
|---|
| 1003 | # (for full text index/raw assoc text extraction)
|
|---|
| 1004 | sub init_plaintext {
|
|---|
| 1005 | my ($self, $textref) = (@_);
|
|---|
| 1006 | my ($page, $fp);
|
|---|
| 1007 | my $imgs = \%{$self->{'imglist'}};
|
|---|
| 1008 | $page = $$textref; # make a copy of original
|
|---|
| 1009 |
|
|---|
| 1010 | # strip tags around image filenames so they don't get zapped
|
|---|
| 1011 | $page =~ s/<\w+\s+.*?([\w\/\\]+\.(?:gif|jpe?g|png))[^>]*>/\"$1\"/gsi;
|
|---|
| 1012 | $page =~ s/<.*?>//gs;
|
|---|
| 1013 | $page =~ s/ / /gs;
|
|---|
| 1014 | $page =~ s/&/&/gs; #TODO: more &zzz; replacements (except <, $gt;)
|
|---|
| 1015 |
|
|---|
| 1016 | # get positions and strip images
|
|---|
| 1017 | while ( $page =~ /([^\s\'\"]+\.(jpe?g|gif|png))/ig ) {
|
|---|
| 1018 | $fp = $1;
|
|---|
| 1019 | if ( $imgs->{$fp}{'exists'} ) {
|
|---|
| 1020 | $imgs->{$fp}{'rawpos'} = pos $page;
|
|---|
| 1021 | }
|
|---|
| 1022 | $page =~ s/\"$fp\"//gs;
|
|---|
| 1023 | }
|
|---|
| 1024 | $self->{'plaintext'} = $page;
|
|---|
| 1025 | }
|
|---|
| 1026 |
|
|---|
| 1027 | # finds and filters images based on size
|
|---|
| 1028 | # (dimensions, height, filesize) and existence
|
|---|
| 1029 | #
|
|---|
| 1030 | # looks for image filenames (.jpg, .gif, etc)
|
|---|
| 1031 | # and checks for existence on disk
|
|---|
| 1032 | # (hence supports most JavaScript images)
|
|---|
| 1033 | sub get_img_list {
|
|---|
| 1034 | my $self = shift (@_);
|
|---|
| 1035 | my ($textref) = (@_);
|
|---|
| 1036 | my ($filepath, $relpath, $abspath, $pos, $num, $width, $height, $filesize);
|
|---|
| 1037 | my $imgs = \%{$self->{'imglist'}};
|
|---|
| 1038 | while ( $$textref =~ /([^\s\'\"]+\.(jpe?g|gif|png))/ig ) {
|
|---|
| 1039 | $filepath = $1;
|
|---|
| 1040 | $pos = pos $$textref;
|
|---|
| 1041 | next if ( $imgs->{$filepath}{'relpath'} );
|
|---|
| 1042 | $relpath = $filepath;
|
|---|
| 1043 | $relpath =~ s/^http\:\/\///; # remove http:// in case we have mirrored it
|
|---|
| 1044 | $relpath =~ s/\\/\//g; # replace \ with /
|
|---|
| 1045 | $relpath =~ s/^\.\///s; # make "./filepath" into "filepath"
|
|---|
| 1046 | $imgs->{$filepath}{'relpath'} = $relpath;
|
|---|
| 1047 | $abspath = "$self->{'htpath'}/$relpath";
|
|---|
| 1048 |
|
|---|
| 1049 | if (! -e $abspath) { next }
|
|---|
| 1050 |
|
|---|
| 1051 | # can't modify real filepath var because it
|
|---|
| 1052 | # then can't be located in the page for tag recognition later
|
|---|
| 1053 | ($width, $height) =
|
|---|
| 1054 | `identify $abspath -ping -format "%wx%h"` =~ /^(\d*)x(\d*)$/m;
|
|---|
| 1055 | if (! ($width && $height)) {
|
|---|
| 1056 | print STDERR "W3ImgPlug: ($abspath) 'identify' failed. Check ImageMagicK binaries are installed and working correctly\n"; next;
|
|---|
| 1057 | }
|
|---|
| 1058 | $filesize = (-s $abspath);
|
|---|
| 1059 | if ( $filesize >= $self->{'min_img_filesize'}
|
|---|
| 1060 | && ( $width >= $self->{'min_img_width'} )
|
|---|
| 1061 | && ( $height >= $self->{'min_img_height'} ) ) {
|
|---|
| 1062 |
|
|---|
| 1063 | $imgs->{$filepath}{'exists'} = 1;
|
|---|
| 1064 | $imgs->{$filepath}{'pos'} = $pos;
|
|---|
| 1065 | $imgs->{$filepath}{'width'} = $width;
|
|---|
| 1066 | $imgs->{$filepath}{'height'} = $height;
|
|---|
| 1067 | $imgs->{$filepath}{'filesize'} = $filesize;
|
|---|
| 1068 | } else {
|
|---|
| 1069 | print {$self->{'outhandle'}} "W3ImgPlug: skipping $self->{'base_path'}/$relpath: $filesize, $width x $height\n"
|
|---|
| 1070 | if $self->{'verbosity'} > 2;
|
|---|
| 1071 | }
|
|---|
| 1072 | }
|
|---|
| 1073 | $num = 0;
|
|---|
| 1074 | foreach $i ( keys %{$imgs} ) {
|
|---|
| 1075 | if ( $imgs->{$i}{'pos'} ) {
|
|---|
| 1076 | $num++;
|
|---|
| 1077 | } else { delete $imgs->{$i} }
|
|---|
| 1078 | }
|
|---|
| 1079 | return $num;
|
|---|
| 1080 | }
|
|---|
| 1081 |
|
|---|
| 1082 | # make the text available to the read function
|
|---|
| 1083 | # by making it an object variable
|
|---|
| 1084 | sub read_file {
|
|---|
| 1085 | my ($self, $filename, $encoding, $language, $textref) = @_;
|
|---|
| 1086 | $self->SUPER::read_file($filename, $encoding, $language, $textref);
|
|---|
| 1087 |
|
|---|
| 1088 | # if HTMLplug has run through, then it will
|
|---|
| 1089 | # have replaced references so we have to
|
|---|
| 1090 | # make a copy of the text before processing
|
|---|
| 1091 | if ( $self->{'index_pages'} ) {
|
|---|
| 1092 | $self->{'text'} = $$textref;
|
|---|
| 1093 | $self->{'textref'} = \($self->{'text'});
|
|---|
| 1094 | } else {
|
|---|
| 1095 | $self->{'textref'} = $textref;
|
|---|
| 1096 | }
|
|---|
| 1097 | $self->{'plaintext'} = undef;
|
|---|
| 1098 | }
|
|---|
| 1099 |
|
|---|
| 1100 | # HTMLPlug only extracts meta-data if it is specified in plugin options
|
|---|
| 1101 | # hence a special function to do it here
|
|---|
| 1102 | sub get_meta_value {
|
|---|
| 1103 | my ($self, $name, $textref) = @_;
|
|---|
| 1104 | my ($value);
|
|---|
| 1105 | $name = lc $name;
|
|---|
| 1106 | if ($name eq "title") {
|
|---|
| 1107 | ($value) = $$textref =~ /<title>(.*?)<\/title>/is
|
|---|
| 1108 | } else {
|
|---|
| 1109 | my $qm = "(?:\"|\')";
|
|---|
| 1110 | ($value) = $$textref =~ /<meta name\s*=\s*$qm?$name$qm?\s+content\s*=\s*$qm?(.*?)$qm?\s*>/is
|
|---|
| 1111 | }
|
|---|
| 1112 | $value = "" unless $value;
|
|---|
| 1113 | return $value;
|
|---|
| 1114 | }
|
|---|
| 1115 |
|
|---|
| 1116 | # make filename an anchor reference
|
|---|
| 1117 | # so we can go straight to the image
|
|---|
| 1118 | # within the cached version of the source page
|
|---|
| 1119 | # (augment's HTMLPlug sub)
|
|---|
| 1120 | sub replace_images {
|
|---|
| 1121 | my $self = shift (@_);
|
|---|
| 1122 | my ($front, $link, $back, $base_dir,
|
|---|
| 1123 | $file, $doc_obj, $section) = @_;
|
|---|
| 1124 | $link =~ s/\"//g;
|
|---|
| 1125 | my ($a_name) = $link;
|
|---|
| 1126 | $a_name =~ s/[\/\\\:\&]/_/g;
|
|---|
| 1127 | # keep a list so we don't repeat the same anchor
|
|---|
| 1128 | if ( ! $self->{'imglist'}{$link}{'anchored'} ) {
|
|---|
| 1129 | $front = "<a name=\"gsdl_$a_name\">$front";
|
|---|
| 1130 | $back = "$back</a>";
|
|---|
| 1131 | $self->{'imglist'}{$link}{'anchored'} = 1;
|
|---|
| 1132 | }
|
|---|
| 1133 | return $self->SUPER::replace_images($front, $link, $back, $base_dir,
|
|---|
| 1134 | $file, $doc_obj, $section);
|
|---|
| 1135 | }
|
|---|
| 1136 |
|
|---|
| 1137 | 1;
|
|---|
