| 1 | ###########################################################################
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| 2 | #
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| 3 | # StructuredHTMLPlugin.pm -- html plugin with extra facilities for teasing out
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| 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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| 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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| 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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| 34 | package StructuredHTMLPlugin;
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| 35 |
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| 36 | use HTMLPlugin;
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| 37 | use ImageConverter; # want the identify method
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| 38 |
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| 39 | use strict; # every perl program should have this!
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| 40 | no strict 'refs'; # make an exception so we can use variables as filehandles
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| 41 |
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| 42 | sub BEGIN {
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| 43 | @StructuredHTMLPlugin::ISA = ('HTMLPlugin');
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| 44 | }
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| 45 |
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| 46 | my $arguments =
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| 47 | [
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| 48 | { 'name' => "level1_header",
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| 49 | 'desc' => "{StructuredHTMLPlugin.level1_header}",
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| 50 | 'type' => "regexp",
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| 51 | 'reqd' => "no",
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| 52 | 'deft' => "" },
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| 53 | { 'name' => "level2_header",
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| 54 | 'desc' => "{StructuredHTMLPlugin.level2_header}",
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| 55 | 'type' => "regexp",
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| 56 | 'reqd' => "no",
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| 57 | 'deft' => "" },
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| 58 | { 'name' => "level3_header",
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| 59 | 'desc' => "{StructuredHTMLPlugin.level3_header}",
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| 60 | 'type' => "regexp",
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| 61 | 'reqd' => "no",
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| 62 | 'deft' => "" },
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| 63 | { 'name' => "title_header",
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| 64 | 'desc' => "{StructuredHTMLPlugin.title_header}",
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| 65 | 'type' => "regexp",
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| 66 | 'reqd' => "no",
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| 67 | 'deft' => "" },
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| 68 | { 'name' => "delete_toc",
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| 69 | 'desc' => "{StructuredHTMLPlugin.delete_toc}",
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| 70 | 'type' => "flag",
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| 71 | 'reqd' => "no"},
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| 72 | { 'name' => "toc_header",
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| 73 | 'desc' => "{StructuredHTMLPlugin.toc_header}",
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| 74 | 'type' => "regexp",
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| 75 | 'reqd' => "no",
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| 76 | 'deft' => "" }
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| 77 | ];
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| 78 |
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| 79 | my $options = { 'name' => "StructuredHTMLPlugin",
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| 80 | 'desc' => "{StructuredHTMLPlugin.desc}",
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| 81 | 'abstract' => "no",
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| 82 | 'inherits' => "yes",
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| 83 | 'args' => $arguments };
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| 84 |
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| 85 | sub new {
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| 86 | my ($class) = shift (@_);
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| 87 | my ($pluginlist,$inputargs,$hashArgOptLists) = @_;
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| 88 | push(@$pluginlist, $class);
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| 89 |
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| 90 | push(@{$hashArgOptLists->{"ArgList"}},@{$arguments});
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| 91 | push(@{$hashArgOptLists->{"OptList"}},$options);
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| 92 |
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| 93 | my $self = new HTMLPlugin($pluginlist, $inputargs, $hashArgOptLists);
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| 94 |
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| 95 | return bless $self, $class;
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| 96 | }
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| 97 |
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| 98 |
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| 99 | sub process {
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| 100 | my $self = shift (@_);
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| 101 | my ($textref, $pluginfo, $base_dir, $file, $metadata, $doc_obj, $gli) = @_;
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| 102 | my $outhandle = $self->{'outhandle'};
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| 103 |
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| 104 | print $outhandle "StructuredHTMLPlugin: processing $file\n"
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| 105 | if $self->{'verbosity'} > 1;
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| 106 |
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| 107 | my @head_and_body = split(/<body/i,$$textref);
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| 108 | my $head = shift(@head_and_body);
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| 109 | my $body_text = join("<body", @head_and_body);
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| 110 | $head =~ m/<title>(.+)<\/title>/i;
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| 111 | my $doctitle = $1 if defined $1;
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| 112 | if (defined $self->{'metadata_fields'} && $self->{'metadata_fields'}=~ /\S/) {
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| 113 | my @doc_properties = split(/<xml>/i,$head);
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| 114 | my $doc_heading = shift(@doc_properties);
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| 115 | my $rest_doc_properties = join(" ", @doc_properties);
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| 116 |
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| 117 | my @extracted_metadata = split(/<\/xml>/i, $rest_doc_properties);
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| 118 | my $extracted_metadata = shift (@extracted_metadata);
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| 119 | $self->extract_metadata($extracted_metadata, $metadata, $doc_obj);
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| 120 | }
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| 121 |
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| 122 | # set the title here if we haven't found it yet
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| 123 | if (!defined $doc_obj->get_metadata_element ($doc_obj->get_top_section(), "Title")) {
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| 124 | if (defined $doctitle && $doctitle =~ /\S/) {
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| 125 | $doc_obj->add_metadata($doc_obj->get_top_section(), "Title", $doctitle);
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| 126 | } else {
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| 127 | $self->title_fallback($doc_obj,$doc_obj->get_top_section(),$file);
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| 128 | }
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| 129 | }
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| 130 |
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| 131 | # If delete_toc is enabled, it means to get rid of toc and tof contents.
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| 132 | # get rid of TOC and TOF sections and their title
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| 133 | if (defined $self->{'delete_toc'} && ($self->{'delete_toc'} == 1)){
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| 134 | if (defined $self->{'toc_header'}&& $self->{'toc_header'} =~ /\S/){
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| 135 | $body_text =~ s/<p class=(($self->{'toc_header'})[^>]*)>(.+?)<\/p>//isg;
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| 136 | }
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| 137 | }
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| 138 |
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| 139 | if (defined $self->{'title_header'} && $self->{'title_header'}=~ /\S/){
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| 140 | $self->{'title_header'} =~ s/^(\()(.*)(\))/$2/is;
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| 141 | $body_text =~ s/<p class=(($self->{'title_header'})[^>]*)>(.+?)<\/p>/<p class=$1><h1>$3<\/h1><\/p>/isg;
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| 142 | }
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| 143 |
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| 144 | if (defined $self->{'level1_header'} && $self->{'level1_header'}=~ /\S/ ){
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| 145 | $self->{'level1_header'} =~ s/^\((.*)\)/$1/i;
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| 146 | $body_text =~ s/<p class=(($self->{'level1_header'})[^>]*)>(.+?)<\/p>/<p class=$1><h1>$3<\/h1><\/p>/isg;
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| 147 | }
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| 148 |
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| 149 | if (defined $self->{'level2_header'} && $self->{'level2_header'}=~ /\S/){
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| 150 | $self->{'level2_header'} =~ s/^\((.*)\)/$1/i;
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| 151 | $body_text =~ s/<p class=(($self->{'level2_header'})[^>]*)>(.+?)<\/p>/<p class=$1><h2>$3<\/h2><\/p>/isg;
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| 152 | }
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| 153 |
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| 154 | if (defined $self->{'level3_header'} && $self->{'level3_header'}=~ /\S/ ){
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| 155 | $self->{'level3_header'} =~ s/^\((.*)\)/$1/is;
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| 156 | $body_text =~ s/<p class=(($self->{'level3_header'})[^>]*)>(.+?)<\/p>/<p class=$1><h3>$3<\/h3><\/p>/isg;
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| 157 | }
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| 158 |
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| 159 | # Tidy up extra new lines
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| 160 | $body_text =~ s/(<p[^>]*><span[^>]*><o:p> <\/o:p><\/span><\/p>)//isg;
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| 161 | $body_text =~ s/(<p[^>]*><o:p> <\/o:p><\/p>)//isg;
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| 162 |
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| 163 | # what was the following line for. effectively unused. do we need it??
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| 164 | #$section_text .= "<!--\n<Section>\n-->\n";
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| 165 | #my $top_section_tag = "<!--\n<Section>\n-->\n";
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| 166 | #$body_text =~ s/(<div.*)/$top_section_text$doctitle$1/i;
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| 167 | #$body_text =~ s/(<div.*)/$top_section_tag$1/i;
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| 168 | my $body = "<body".$body_text;
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| 169 |
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| 170 | my $section_text = $head;
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| 171 |
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| 172 | # split HTML text on <h1>, <h2> etc tags
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| 173 | my @h_split = split(/<h/i,$body);
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| 174 |
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| 175 | my $hnum = 0;
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| 176 |
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| 177 | my $sectionh1 = 0;
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| 178 | $section_text .= shift(@h_split);
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| 179 |
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| 180 | my $hc;
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| 181 | foreach $hc ( @h_split )
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| 182 | {
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| 183 | if ($hc =~ m/^([1-3])\s*.*?>(.*)$/s)
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| 184 | {
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| 185 | my $new_hnum = $1;
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| 186 | my $hc_after = $2;
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| 187 |
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| 188 | if ($hc_after =~ m/^(.*?)<\/h$new_hnum>/is)
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| 189 | {
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| 190 | my $h_text = $1;
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| 191 | $hc =~ s/^(\ \;)+/\ \;/g;
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| 192 | # boil HTML down to some interesting text
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| 193 | $h_text =~ s/^[1-3]>//;
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| 194 | $h_text =~ s/<\/?.*?>//sg;
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| 195 | $h_text =~ s/\s+/ /sg;
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| 196 | $h_text =~ s/^\s$//s;
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| 197 | $h_text =~ s/( )+\W*/ /sg;
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| 198 |
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| 199 | if ($h_text =~ m/\w+/)
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| 200 | {
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| 201 | if ($new_hnum > $hnum)
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| 202 | {
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| 203 | # increase section nesting
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| 204 | $hnum++;
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| 205 | while ($hnum < $new_hnum)
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| 206 | {
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| 207 | my $spacing = " " x $hnum;
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| 208 | $section_text .= "<!--\n";
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| 209 | $section_text .= $spacing."<Section>\n";
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| 210 | $section_text .= "-->\n";
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| 211 | $hnum++;
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| 212 | }
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| 213 | }
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| 214 | else # ($new_hnum <= $hnum)
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| 215 | {
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| 216 | # descrease section nesting
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| 217 | while ($hnum >= $new_hnum)
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| 218 | {
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| 219 | my $spacing = " " x $hnum;
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| 220 | $section_text .= "<!--\n";
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| 221 | $section_text .= $spacing."</Section>\n";
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| 222 | $section_text .= "-->\n";
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| 223 | $hnum--;
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| 224 | }
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| 225 | $hnum++;
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| 226 | }
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| 227 |
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| 228 | my $spacing = " " x $hnum;
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| 229 | $section_text .= "<!--\n";
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| 230 | $section_text .= $spacing."<Section>\n";
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| 231 | $section_text .= $spacing." <Description>\n";
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| 232 | $section_text .= $spacing." <Metadata name=\"Title\">$h_text</Metadata>";
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| 233 | $section_text .= $spacing." </Description>\n";
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| 234 | $section_text .= "-->\n";
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| 235 |
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| 236 | #print $outhandle $spacing."$h_text\n"
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| 237 | # if $self->{'verbosity'} > 2;
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| 238 |
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| 239 | $sectionh1++ if ($hnum==1);
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| 240 | }
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| 241 | }
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| 242 | else {
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| 243 | ### print STDERR "***** hc = <h$hc\n\n";
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| 244 | }
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| 245 | $section_text .= "<h$hc";
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| 246 | }
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| 247 | else
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| 248 | {
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| 249 | $section_text .= "<h$hc";
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| 250 | }
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| 251 | }
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| 252 |
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| 253 | while ($hnum >= 1)
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| 254 | {
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| 255 | my $spacing = " " x $hnum;
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| 256 | $section_text .= "<!--\n";
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| 257 | $section_text .= $spacing."</Section>\n";
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| 258 | $section_text .= "-->\n";
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| 259 | $hnum--;
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| 260 | }
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| 261 |
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| 262 | $section_text .= "<!--\n</Section>\n-->\n";
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| 263 |
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| 264 | $$textref = $section_text;
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| 265 |
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| 266 | # if ($sectionh1>0)
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| 267 | # {
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| 268 | # print $outhandle " Located section headings ..."
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| 269 | # if $self->{'verbosity'} > 1;
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| 270 | # }
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| 271 |
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| 272 | $$textref =~ s/<!\[if !vml\]>/<![if vml]>/g;
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| 273 |
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| 274 | $$textref =~ s/( )+/ /sg;
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| 275 |
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| 276 | ## $$textref =~ s/<o:p> <\/o:p>//g; # used with VML to space figures?
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| 277 |
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| 278 | $self->SUPER::process(@_);
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| 279 |
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| 280 | }
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| 281 |
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| 282 |
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| 283 | sub resize_if_necessary
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| 284 | {
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| 285 | my ($self,$front,$back,$base_dir,$href) = @_;
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| 286 |
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| 287 | # dig out width and height of image, if there
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| 288 | my $img_attributes = "$front back";
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| 289 | my ($img_width) = ($img_attributes =~ m/\s+width=\"?(\d+)\"?/i);
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| 290 | my ($img_height) = ($img_attributes =~ m/\s+height=\"?(\d+)\"?/i);
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| 291 |
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| 292 | # derive local filename for image based on its URL
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| 293 | my $img_filename = $href;
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| 294 | $img_filename =~ s/^[^:]*:\/\///;
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| 295 | $img_filename = &util::filename_cat($base_dir, $img_filename);
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| 296 |
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| 297 | # Replace %20's in URL with a space if required. Note that the filename
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| 298 | # may include the %20 in some situations
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| 299 | if ($img_filename =~ /\%20/) {
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| 300 | if (!-e $img_filename) {
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| 301 | $img_filename =~ s/\%20/ /g;
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| 302 | }
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| 303 | }
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| 304 | if ((-e $img_filename) && (defined $img_width) && (defined $img_height)) {
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| 305 | # get image info on width and height
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| 306 |
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| 307 | my $outhandle = $self->{'outhandle'};
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| 308 | my $verbosity = $self->{'verbosity'};
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| 309 |
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| 310 | my ($image_type, $actual_width, $actual_height, $image_size)
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| 311 | = &ImageConverter::identify($img_filename, $outhandle, $verbosity);
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| 312 |
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| 313 | #print STDERR "**** $actual_width x $actual_height";
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| 314 | #print STDERR " (requested: $img_width x $img_height)\n";
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| 315 |
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| 316 | if (($img_width < $actual_width) || ($img_height < $actual_height)) {
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| 317 | #print $outhandle "Resizing $img_filename\n" if ($verbosity > 0);
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| 318 |
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| 319 | # derive new image name based on current image
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| 320 | my ($tailname, $dirname, $suffix)
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| 321 | = &File::Basename::fileparse($img_filename, "\\.[^\\.]+\$");
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| 322 |
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| 323 | my $resized_filename
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| 324 | = &util::filename_cat($dirname, $tailname."_resized".$suffix);
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| 325 |
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| 326 | #print STDERR "**** suffix = $suffix\n";
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| 327 |
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| 328 | # Generate smaller image with convert
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| 329 | my $newsize = "$img_width"."x$img_height";
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| 330 | my $command = "convert -interlace plane -verbose "
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| 331 | ."-geometry $newsize \"$img_filename\" \"$resized_filename\"";
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| 332 | #print $outhandle "ImageResize: $command\n" if ($verbosity > 2);
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| 333 | #my $result = '';
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| 334 | #print $outhandle "ImageResize result: $result\n" if ($verbosity > 2);
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| 335 | }
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| 336 | }
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| 337 | return $href;
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| 338 | }
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| 339 |
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| 340 | sub replace_images {
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| 341 | my $self = shift (@_);
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| 342 | my ($front, $link, $back, $base_dir,
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| 343 | $file, $doc_obj, $section) = @_;
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| 344 | # remove quotes from link at start and end if necessary
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| 345 | if ($link=~/^\"/) {
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| 346 | $link=~s/^\"//;$link=~s/\"$//;
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| 347 | $front.='"';
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| 348 | $back="\"$back";
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| 349 | }
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| 350 |
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| 351 | $link =~ s/\n/ /g;
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| 352 |
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| 353 | my ($href, $hash_part, $rl) = $self->format_link ($link, $base_dir, $file);
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| 354 |
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| 355 | ## $href = $self->resize_if_necessary($front,$back,$base_dir,$href);
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| 356 |
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| 357 | my $middle = $self->add_file ($href, $rl, $hash_part, $base_dir, $doc_obj, $section);
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| 358 |
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| 359 | return $front . $middle . $back;
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| 360 | }
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| 361 |
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| 362 | sub extract_metadata
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| 363 | {
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| 364 | my $self = shift (@_);
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| 365 | my ($textref, $metadata, $doc_obj) = @_;
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| 366 | my $outhandle = $self->{'outhandle'};
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| 367 |
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| 368 | return if (!defined $textref);
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| 369 |
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| 370 | # metadata fields to extract/save. 'key' is the (lowercase) name of the
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| 371 | # html meta, 'value' is the metadata name for greenstone to use
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| 372 | my %find_fields = ();
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| 373 | my ($tag,$value);
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| 374 |
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| 375 | my $orig_field = "";
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| 376 | foreach my $field (split /,/, $self->{'metadata_fields'}) {
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| 377 | # support tag<tagname>
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| 378 | if ($field =~ /^(.*?)<(.*?)>$/) {
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| 379 | # "$2" is the user's preferred gs metadata name
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| 380 | $find_fields{lc($1)}=$2; # lc = lowercase
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| 381 | $orig_field = $1;
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| 382 | } else { # no <tagname> for mapping
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| 383 | # "$field" is the user's preferred gs metadata name
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| 384 | $find_fields{lc($field)}=$field; # lc = lowercase
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| 385 | $orig_field = $field;
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| 386 | }
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| 387 |
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| 388 | if ($textref =~ m/<o:$orig_field>(.*)<\/o:$orig_field>/i){
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| 389 | $tag = $orig_field;
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| 390 | $value = $1;
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| 391 | if (!defined $value || !defined $tag){
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| 392 | #print $outhandle "StructuredHTMLPlugin: can't find VALUE in \"$tag\"\n";
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| 393 | next;
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| 394 | } else {
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| 395 | # clean up and add
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| 396 | chomp($value); # remove trailing \n, if any
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| 397 | $tag = $find_fields{lc($tag)};
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| 398 | #print $outhandle " extracted \"$tag\" metadata \"$value\"\n"
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| 399 | # if ($self->{'verbosity'} > 2);
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| 400 | $doc_obj->add_utf8_metadata($doc_obj->get_top_section(), $tag, $value);
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| 401 | }
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| 402 | }
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| 403 | }
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| 404 | }
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| 405 |
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| 406 | 1;
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