| [10271] | 1 | ###########################################################################
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| 2 | #
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| [15872] | 3 | # StructuredHTMLPlugin.pm -- html plugin with extra facilities for teasing out
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| [10404] | 4 | # hierarchical structure (such as h1, h2, h3, or user-defined tags) in an
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| 5 | # HTML document
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| [10271] | 6 | #
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| 7 | # A component of the Greenstone digital library software
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| 8 | # from the New Zealand Digital Library Project at the
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| 9 | # University of Waikato, New Zealand.
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| 10 | #
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| 11 | # Copyright (C) 1999 New Zealand Digital Library Project
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| 12 | #
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| 13 | # This program is free software; you can redistribute it and/or modify
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| 14 | # it under the terms of the GNU General Public License as published by
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| 15 | # the Free Software Foundation; either version 2 of the License, or
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| 16 | # (at your option) any later version.
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| 17 | #
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| 18 | # This program is distributed in the hope that it will be useful,
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| 19 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 20 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 21 | # GNU General Public License for more details.
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| 22 | #
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| 23 | # You should have received a copy of the GNU General Public License
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| 24 | # along with this program; if not, write to the Free Software
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| 25 | # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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| 26 | #
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| 27 | ###########################################################################
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| [10404] | 28 | # This plugin is to process an HTML file where sections are divided by
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| 29 | # user-defined headings tags. As it is difficult to predict what user's definition
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| 30 | # this plugin allows to detect the user-defined titles up to three levels (level1, level2, level3...)
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| 31 | # as well as allows to get rid of user-defined Table of Content (TOC)...
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| 32 | # format:e.g. level1 (Abstract_title|ChapterTitle|Referencing Heading) level2(SectionHeading)...
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| 33 |
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| [15872] | 34 | package StructuredHTMLPlugin;
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| [10271] | 35 |
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| [15872] | 36 | use HTMLPlugin;
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| 37 | use ImageConverter; # want the identify method
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| [24600] | 38 | use util;
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| [10271] | 39 |
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| [15872] | 40 | use strict; # every perl program should have this!
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| 41 | no strict 'refs'; # make an exception so we can use variables as filehandles
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| [10404] | 42 |
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| [10271] | 43 | sub BEGIN {
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| [15872] | 44 | @StructuredHTMLPlugin::ISA = ('HTMLPlugin');
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| [10271] | 45 | }
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| 46 |
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| [11849] | 47 | my $arguments =
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| 48 | [
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| 49 | { 'name' => "level1_header",
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| [15872] | 50 | 'desc' => "{StructuredHTMLPlugin.level1_header}",
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| [11849] | 51 | 'type' => "regexp",
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| 52 | 'reqd' => "no",
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| 53 | 'deft' => "" },
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| 54 | { 'name' => "level2_header",
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| [15872] | 55 | 'desc' => "{StructuredHTMLPlugin.level2_header}",
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| [11849] | 56 | 'type' => "regexp",
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| 57 | 'reqd' => "no",
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| 58 | 'deft' => "" },
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| 59 | { 'name' => "level3_header",
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| [15872] | 60 | 'desc' => "{StructuredHTMLPlugin.level3_header}",
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| [11849] | 61 | 'type' => "regexp",
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| 62 | 'reqd' => "no",
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| 63 | 'deft' => "" },
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| 64 | { 'name' => "title_header",
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| [15872] | 65 | 'desc' => "{StructuredHTMLPlugin.title_header}",
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| [11849] | 66 | 'type' => "regexp",
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| 67 | 'reqd' => "no",
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| 68 | 'deft' => "" },
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| [11884] | 69 | { 'name' => "delete_toc",
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| [15872] | 70 | 'desc' => "{StructuredHTMLPlugin.delete_toc}",
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| [11884] | 71 | 'type' => "flag",
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| 72 | 'reqd' => "no"},
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| [11849] | 73 | { 'name' => "toc_header",
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| [15872] | 74 | 'desc' => "{StructuredHTMLPlugin.toc_header}",
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| [11849] | 75 | 'type' => "regexp",
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| 76 | 'reqd' => "no",
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| [11884] | 77 | 'deft' => "" }
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| [11849] | 78 | ];
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| [10271] | 79 |
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| [15872] | 80 | my $options = { 'name' => "StructuredHTMLPlugin",
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| 81 | 'desc' => "{StructuredHTMLPlugin.desc}",
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| [10271] | 82 | 'abstract' => "no",
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| 83 | 'inherits' => "yes",
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| 84 | 'args' => $arguments };
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| 85 |
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| 86 | sub new {
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| 87 | my ($class) = shift (@_);
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| 88 | my ($pluginlist,$inputargs,$hashArgOptLists) = @_;
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| 89 | push(@$pluginlist, $class);
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| 90 |
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| [15872] | 91 | push(@{$hashArgOptLists->{"ArgList"}},@{$arguments});
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| 92 | push(@{$hashArgOptLists->{"OptList"}},$options);
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| [10271] | 93 |
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| [15872] | 94 | my $self = new HTMLPlugin($pluginlist, $inputargs, $hashArgOptLists);
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| [10271] | 95 |
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| 96 | return bless $self, $class;
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| 97 | }
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| 98 |
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| 99 |
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| 100 | sub process {
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| 101 | my $self = shift (@_);
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| [10404] | 102 | my ($textref, $pluginfo, $base_dir, $file, $metadata, $doc_obj, $gli) = @_;
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| [10271] | 103 | my $outhandle = $self->{'outhandle'};
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| 104 |
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| 105 | my @head_and_body = split(/<body/i,$$textref);
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| 106 | my $head = shift(@head_and_body);
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| [33301] | 107 | my $body_text = join("<body", @head_and_body); # won't actually work to prefix "<body" to just the body remaining in @head_and_body array, since only 1 element (the body) remains in @head_and_body
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| [10600] | 108 | $head =~ m/<title>(.+)<\/title>/i;
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| 109 | my $doctitle = $1 if defined $1;
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| [10723] | 110 | if (defined $self->{'metadata_fields'} && $self->{'metadata_fields'}=~ /\S/) {
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| [10426] | 111 | my @doc_properties = split(/<xml>/i,$head);
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| 112 | my $doc_heading = shift(@doc_properties);
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| 113 | my $rest_doc_properties = join(" ", @doc_properties);
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| [11380] | 114 |
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| [10426] | 115 | my @extracted_metadata = split(/<\/xml>/i, $rest_doc_properties);
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| 116 | my $extracted_metadata = shift (@extracted_metadata);
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| 117 | $self->extract_metadata($extracted_metadata, $metadata, $doc_obj);
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| 118 | }
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| 119 |
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| [11893] | 120 | # set the title here if we haven't found it yet
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| 121 | if (!defined $doc_obj->get_metadata_element ($doc_obj->get_top_section(), "Title")) {
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| 122 | if (defined $doctitle && $doctitle =~ /\S/) {
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| 123 | $doc_obj->add_metadata($doc_obj->get_top_section(), "Title", $doctitle);
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| 124 | } else {
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| 125 | $self->title_fallback($doc_obj,$doc_obj->get_top_section(),$file);
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| 126 | }
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| 127 | }
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| 128 |
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| 129 | # If delete_toc is enabled, it means to get rid of toc and tof contents.
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| [10271] | 130 | # get rid of TOC and TOF sections and their title
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| [11380] | 131 | if (defined $self->{'delete_toc'} && ($self->{'delete_toc'} == 1)){
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| [10496] | 132 | if (defined $self->{'toc_header'}&& $self->{'toc_header'} =~ /\S/){
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| 133 | $body_text =~ s/<p class=(($self->{'toc_header'})[^>]*)>(.+?)<\/p>//isg;
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| 134 | }
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| [10443] | 135 | }
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| [10600] | 136 |
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| [10496] | 137 | if (defined $self->{'title_header'} && $self->{'title_header'}=~ /\S/){
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| [10271] | 138 | $self->{'title_header'} =~ s/^(\()(.*)(\))/$2/is;
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| [10600] | 139 | $body_text =~ s/<p class=(($self->{'title_header'})[^>]*)>(.+?)<\/p>/<p class=$1><h1>$3<\/h1><\/p>/isg;
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| [10271] | 140 | }
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| [10443] | 141 |
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| 142 | if (defined $self->{'level1_header'} && $self->{'level1_header'}=~ /\S/ ){
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| 143 | $self->{'level1_header'} =~ s/^\((.*)\)/$1/i;
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| [10595] | 144 | $body_text =~ s/<p class=(($self->{'level1_header'})[^>]*)>(.+?)<\/p>/<p class=$1><h1>$3<\/h1><\/p>/isg;
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| [10271] | 145 | }
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| [10443] | 146 |
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| [10496] | 147 | if (defined $self->{'level2_header'} && $self->{'level2_header'}=~ /\S/){
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| [10443] | 148 | $self->{'level2_header'} =~ s/^\((.*)\)/$1/i;
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| [10595] | 149 | $body_text =~ s/<p class=(($self->{'level2_header'})[^>]*)>(.+?)<\/p>/<p class=$1><h2>$3<\/h2><\/p>/isg;
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| [10271] | 150 | }
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| 151 |
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| [10496] | 152 | if (defined $self->{'level3_header'} && $self->{'level3_header'}=~ /\S/ ){
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| [10443] | 153 | $self->{'level3_header'} =~ s/^\((.*)\)/$1/is;
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| [10271] | 154 | $body_text =~ s/<p class=(($self->{'level3_header'})[^>]*)>(.+?)<\/p>/<p class=$1><h3>$3<\/h3><\/p>/isg;
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| 155 | }
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| [11893] | 156 |
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| [10271] | 157 | # Tidy up extra new lines
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| 158 | $body_text =~ s/(<p[^>]*><span[^>]*><o:p> <\/o:p><\/span><\/p>)//isg;
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| 159 | $body_text =~ s/(<p[^>]*><o:p> <\/o:p><\/p>)//isg;
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| [33301] | 160 |
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| 161 | # what was the following line for. effectively unused. do we need it??
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| [15872] | 162 | #$section_text .= "<!--\n<Section>\n-->\n";
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| [10600] | 163 | #my $top_section_tag = "<!--\n<Section>\n-->\n";
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| 164 | #$body_text =~ s/(<div.*)/$top_section_text$doctitle$1/i;
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| 165 | #$body_text =~ s/(<div.*)/$top_section_tag$1/i;
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| [10271] | 166 | my $body = "<body".$body_text;
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| [33301] | 167 |
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| [33309] | 168 | # remove empty headings that Word's windows_scripting may insert for multiple new lines around headings
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| 169 | # have heading markup, e.g. <h2><o:p> </o:p></h2>
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| 170 | $body =~ s@<h[1-6]>(<o:p>)?( )+(</o:p>)?</h[1-6]>@@gis;
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| 171 |
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| [10271] | 172 | my $section_text = $head;
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| [10426] | 173 |
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| [10271] | 174 | # split HTML text on <h1>, <h2> etc tags
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| 175 | my @h_split = split(/<h/i,$body);
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| [10426] | 176 |
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| [10271] | 177 | my $hnum = 0;
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| 178 |
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| 179 | my $sectionh1 = 0;
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| 180 | $section_text .= shift(@h_split);
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| [33301] | 181 |
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| 182 | # When windows_scripting is on, WordPlugin invokes Word to convert the doc(x) file to HTML which is then
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| 183 | # processed by this StructuredHTMLPlugin. However, Word will embed the entire HTML body content inside a <div>
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| 184 | # This <div> becomes problematic, since in sectioned documents, the first section would end up starting with a div
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| 185 | # but not contain a matching closing div, while the final section will end with an unmatched closing div.
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| 186 | # So, as a hack, we remove any opening <div> appearing immediately after the <body> before the first <h>eading.
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| 187 | # And we'll set a flag to remember to remove any corresponding closing </div> before the closing </body>.
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| 188 | # So, now we look for any unclosed <div> elements in the preamble (pre-Headings) html that is in $section_text
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| 189 | my $remove_global_div = 0;
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| 190 | if($section_text =~ m/^(.*?)\s*<div[^>]*>\s*$/is) {
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| 191 | $section_text = $1;
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| 192 | $remove_global_div = 1;
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| 193 | print $outhandle "********** Found and removed a global opening <div> at start of html body, will monitor for closing div too.\n"
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| 194 | if $self->{'verbosity'} > 2;
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| 195 | }
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| 196 |
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| [10271] | 197 | my $hc;
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| 198 | foreach $hc ( @h_split )
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| 199 | {
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| [33299] | 200 | if ($hc =~ m/^([1-3])\s*.*?>(.*)$/s)
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| [10271] | 201 | {
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| [33299] | 202 | my $new_hnum = $1;
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| 203 | my $hc_after = $2;
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| 204 | my $filtered_hc = undef;
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| 205 |
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| 206 | if ($hc_after =~ m/^(.*?)<\/h$new_hnum>(.*)$/is)
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| [10271] | 207 | {
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| [33299] | 208 | my $h_text = $1;
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| 209 | $filtered_hc = $2; # This represents the remainder of $hc, after the (e.g.) <h2>xxxx</h2> element
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| 210 |
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| 211 | $hc =~ s/^(\ \;)+/\ \;/g;
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| 212 | # boil HTML down to some interesting text
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| 213 | $h_text =~ s/^[1-3]>//;
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| 214 | $h_text =~ s/<\/?.*?>//sg;
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| 215 | $h_text =~ s/\s+/ /sg;
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| 216 | $h_text =~ s/^\s$//s;
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| 217 | $h_text =~ s/( )+\W*/ /sg;
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| 218 |
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| 219 | if ($h_text =~ m/\w+/)
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| 220 | {
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| 221 | if ($new_hnum > $hnum)
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| 222 | {
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| 223 | # increase section nesting
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| 224 | $hnum++;
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| 225 | while ($hnum < $new_hnum)
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| 226 | {
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| 227 | my $spacing = " " x $hnum;
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| 228 | $section_text .= "<!--\n";
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| 229 | $section_text .= $spacing."<Section>\n";
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| 230 | $section_text .= "-->\n";
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| 231 | $hnum++;
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| 232 | }
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| 233 | }
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| 234 | else # ($new_hnum <= $hnum)
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| 235 | {
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| 236 | # descrease section nesting
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| 237 | while ($hnum >= $new_hnum)
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| 238 | {
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| 239 | my $spacing = " " x $hnum;
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| 240 | $section_text .= "<!--\n";
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| 241 | $section_text .= $spacing."</Section>\n";
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| 242 | $section_text .= "-->\n";
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| 243 | $hnum--;
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| 244 | }
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| 245 | $hnum++;
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| 246 | }
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| 247 |
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| 248 | my $spacing = " " x $hnum;
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| 249 | $section_text .= "<!--\n";
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| 250 | $section_text .= $spacing."<Section>\n";
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| 251 | $section_text .= $spacing." <Description>\n";
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| 252 | $section_text .= $spacing." <Metadata name=\"Title\">$h_text</Metadata>";
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| 253 | $section_text .= $spacing." </Description>\n";
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| 254 | $section_text .= "-->\n";
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| 255 |
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| 256 | #print $outhandle $spacing."$h_text\n"
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| 257 | # if $self->{'verbosity'} > 2;
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| 258 |
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| 259 | $sectionh1++ if ($hnum==1);
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| 260 | }
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| [10271] | 261 | }
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| [33299] | 262 | else {
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| 263 | ### print STDERR "***** hc = <h$hc\n\n";
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| [10271] | 264 | }
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| [33299] | 265 |
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| 266 | # This can probably be replaced by the first statement in the if-statement, because
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| 267 | # $filtered_hc should always be defined when it is assigned above (even if it resolves
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| 268 | # to be an empty string)
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| 269 | if (defined $filtered_hc) {
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| 270 | $section_text .= $filtered_hc;
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| 271 | }
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| 272 | else {
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| 273 | $section_text .= "<h$hc";
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| 274 | }
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| [10271] | 275 | }
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| [33299] | 276 | else
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| 277 | {
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| 278 | $section_text .= "<h$hc";
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| 279 | }
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| [10271] | 280 | }
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| [33301] | 281 |
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| 282 | if($remove_global_div) { # then need to also handle a closing </div> tag for the global div too, and if one is present, remove it
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| 283 | $section_text =~ s@\s*</div[^>]*>(\s*</body>\s*</html>\s*)$@$1@is;
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| 284 | print $outhandle "********** Removing any matching closing global divider element\n"
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| 285 | if $self->{'verbosity'} > 2;
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| 286 | }
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| 287 |
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| 288 |
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| 289 | while ($hnum >= 1)
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| [10271] | 290 | {
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| 291 | my $spacing = " " x $hnum;
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| 292 | $section_text .= "<!--\n";
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| 293 | $section_text .= $spacing."</Section>\n";
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| 294 | $section_text .= "-->\n";
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| 295 | $hnum--;
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| 296 | }
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| 297 |
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| 298 | $section_text .= "<!--\n</Section>\n-->\n";
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| [33301] | 299 |
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| [10271] | 300 | $$textref = $section_text;
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| [10426] | 301 |
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| [11893] | 302 | # if ($sectionh1>0)
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| 303 | # {
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| 304 | # print $outhandle " Located section headings ..."
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| 305 | # if $self->{'verbosity'} > 1;
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| 306 | # }
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| [10426] | 307 |
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| [10271] | 308 | $$textref =~ s/<!\[if !vml\]>/<![if vml]>/g;
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| [10426] | 309 |
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| [10271] | 310 | $$textref =~ s/( )+/ /sg;
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| 311 |
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| [10426] | 312 | ## $$textref =~ s/<o:p> <\/o:p>//g; # used with VML to space figures?
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| 313 |
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| [10271] | 314 | $self->SUPER::process(@_);
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| [10426] | 315 |
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| [10271] | 316 | }
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| 317 |
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| 318 |
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| 319 | sub resize_if_necessary
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| 320 | {
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| 321 | my ($self,$front,$back,$base_dir,$href) = @_;
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| [10426] | 322 |
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| [10271] | 323 | # dig out width and height of image, if there
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| 324 | my $img_attributes = "$front back";
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| 325 | my ($img_width) = ($img_attributes =~ m/\s+width=\"?(\d+)\"?/i);
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| 326 | my ($img_height) = ($img_attributes =~ m/\s+height=\"?(\d+)\"?/i);
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| [10426] | 327 |
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| [10271] | 328 | # derive local filename for image based on its URL
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| 329 | my $img_filename = $href;
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| 330 | $img_filename =~ s/^[^:]*:\/\///;
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| 331 | $img_filename = &util::filename_cat($base_dir, $img_filename);
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| [10426] | 332 |
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| [10271] | 333 | # Replace %20's in URL with a space if required. Note that the filename
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| 334 | # may include the %20 in some situations
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| 335 | if ($img_filename =~ /\%20/) {
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| 336 | if (!-e $img_filename) {
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| 337 | $img_filename =~ s/\%20/ /g;
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| 338 | }
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| 339 | }
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| 340 | if ((-e $img_filename) && (defined $img_width) && (defined $img_height)) {
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| 341 | # get image info on width and height
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| [10426] | 342 |
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| [10271] | 343 | my $outhandle = $self->{'outhandle'};
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| 344 | my $verbosity = $self->{'verbosity'};
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| 345 |
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| 346 | my ($image_type, $actual_width, $actual_height, $image_size)
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| [15872] | 347 | = &ImageConverter::identify($img_filename, $outhandle, $verbosity);
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| [10426] | 348 |
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| [10356] | 349 | #print STDERR "**** $actual_width x $actual_height";
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| 350 | #print STDERR " (requested: $img_width x $img_height)\n";
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| [10271] | 351 |
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| 352 | if (($img_width < $actual_width) || ($img_height < $actual_height)) {
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| [11893] | 353 | #print $outhandle "Resizing $img_filename\n" if ($verbosity > 0);
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| [10426] | 354 |
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| [10271] | 355 | # derive new image name based on current image
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| 356 | my ($tailname, $dirname, $suffix)
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| [15872] | 357 | = &File::Basename::fileparse($img_filename, "\\.[^\\.]+\$");
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| [10426] | 358 |
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| [10271] | 359 | my $resized_filename
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| 360 | = &util::filename_cat($dirname, $tailname."_resized".$suffix);
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| [10426] | 361 |
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| [10356] | 362 | #print STDERR "**** suffix = $suffix\n";
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| [10426] | 363 |
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| [10271] | 364 | # Generate smaller image with convert
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| [15872] | 365 | my $newsize = "$img_width"."x$img_height";
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| [10271] | 366 | my $command = "convert -interlace plane -verbose "
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| [15872] | 367 | ."-geometry $newsize \"$img_filename\" \"$resized_filename\"";
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| [24600] | 368 | $command = "\"".&util::get_perl_exec()."\" -S gs-magick.pl $command";
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| [11893] | 369 | #print $outhandle "ImageResize: $command\n" if ($verbosity > 2);
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| 370 | #my $result = '';
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| 371 | #print $outhandle "ImageResize result: $result\n" if ($verbosity > 2);
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| [10271] | 372 | }
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| 373 | }
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| 374 | return $href;
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| 375 | }
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| 376 |
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| 377 |
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| [10426] | 378 | sub extract_metadata
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| 379 | {
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| 380 | my $self = shift (@_);
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| 381 | my ($textref, $metadata, $doc_obj) = @_;
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| 382 | my $outhandle = $self->{'outhandle'};
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| 383 |
|
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| [11380] | 384 | return if (!defined $textref);
|
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| 385 |
|
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| [21801] | 386 | my $separator = $self->{'metadata_field_separator'};
|
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| 387 | if ($separator eq "") {
|
|---|
| 388 | undef $separator;
|
|---|
| 389 | }
|
|---|
| [10426] | 390 | # metadata fields to extract/save. 'key' is the (lowercase) name of the
|
|---|
| 391 | # html meta, 'value' is the metadata name for greenstone to use
|
|---|
| 392 | my %find_fields = ();
|
|---|
| 393 | my ($tag,$value);
|
|---|
| [10271] | 394 |
|
|---|
| [10426] | 395 | my $orig_field = "";
|
|---|
| [19993] | 396 | foreach my $field (split /\s*,\s*/, $self->{'metadata_fields'}) {
|
|---|
| [10426] | 397 | # support tag<tagname>
|
|---|
| [19993] | 398 | if ($field =~ /^(.*?)\s*<(.*?)>$/) {
|
|---|
| [10426] | 399 | # "$2" is the user's preferred gs metadata name
|
|---|
| 400 | $find_fields{lc($1)}=$2; # lc = lowercase
|
|---|
| 401 | $orig_field = $1;
|
|---|
| 402 | } else { # no <tagname> for mapping
|
|---|
| 403 | # "$field" is the user's preferred gs metadata name
|
|---|
| 404 | $find_fields{lc($field)}=$field; # lc = lowercase
|
|---|
| 405 | $orig_field = $field;
|
|---|
| 406 | }
|
|---|
| [11380] | 407 |
|
|---|
| [10426] | 408 | if ($textref =~ m/<o:$orig_field>(.*)<\/o:$orig_field>/i){
|
|---|
| 409 | $tag = $orig_field;
|
|---|
| 410 | $value = $1;
|
|---|
| 411 | if (!defined $value || !defined $tag){
|
|---|
| [15872] | 412 | #print $outhandle "StructuredHTMLPlugin: can't find VALUE in \"$tag\"\n";
|
|---|
| [10426] | 413 | next;
|
|---|
| 414 | } else {
|
|---|
| 415 | # clean up and add
|
|---|
| 416 | chomp($value); # remove trailing \n, if any
|
|---|
| 417 | $tag = $find_fields{lc($tag)};
|
|---|
| [11893] | 418 | #print $outhandle " extracted \"$tag\" metadata \"$value\"\n"
|
|---|
| 419 | # if ($self->{'verbosity'} > 2);
|
|---|
| [21801] | 420 | if (defined $separator) {
|
|---|
| 421 | my @values = split($separator, $value);
|
|---|
| 422 | foreach my $v (@values) {
|
|---|
| 423 | $doc_obj->add_utf8_metadata($doc_obj->get_top_section(), $tag, $v) if $v =~ /\S/;
|
|---|
| 424 | }
|
|---|
| 425 | }
|
|---|
| 426 | else {
|
|---|
| 427 | $doc_obj->add_utf8_metadata($doc_obj->get_top_section(), $tag, $value);
|
|---|
| 428 | }
|
|---|
| [10426] | 429 | }
|
|---|
| 430 | }
|
|---|
| 431 | }
|
|---|
| 432 | }
|
|---|
| 433 |
|
|---|
| [10271] | 434 | 1;
|
|---|
