[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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[10271] | 38 |
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[15872] | 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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[10404] | 41 |
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[10271] | 42 | sub BEGIN {
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[15872] | 43 | @StructuredHTMLPlugin::ISA = ('HTMLPlugin');
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[10271] | 44 | }
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| 45 |
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[11849] | 46 | my $arguments =
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| 47 | [
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| 48 | { 'name' => "level1_header",
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[15872] | 49 | 'desc' => "{StructuredHTMLPlugin.level1_header}",
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[11849] | 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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[15872] | 54 | 'desc' => "{StructuredHTMLPlugin.level2_header}",
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[11849] | 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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[15872] | 59 | 'desc' => "{StructuredHTMLPlugin.level3_header}",
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[11849] | 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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[15872] | 64 | 'desc' => "{StructuredHTMLPlugin.title_header}",
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[11849] | 65 | 'type' => "regexp",
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| 66 | 'reqd' => "no",
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| 67 | 'deft' => "" },
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[11884] | 68 | { 'name' => "delete_toc",
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[15872] | 69 | 'desc' => "{StructuredHTMLPlugin.delete_toc}",
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[11884] | 70 | 'type' => "flag",
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| 71 | 'reqd' => "no"},
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[11849] | 72 | { 'name' => "toc_header",
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[15872] | 73 | 'desc' => "{StructuredHTMLPlugin.toc_header}",
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[11849] | 74 | 'type' => "regexp",
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| 75 | 'reqd' => "no",
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[11884] | 76 | 'deft' => "" }
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[11849] | 77 | ];
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[10271] | 78 |
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[15872] | 79 | my $options = { 'name' => "StructuredHTMLPlugin",
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| 80 | 'desc' => "{StructuredHTMLPlugin.desc}",
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[10271] | 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, $class);
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| 89 |
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[15872] | 90 | push(@{$hashArgOptLists->{"ArgList"}},@{$arguments});
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| 91 | push(@{$hashArgOptLists->{"OptList"}},$options);
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[10271] | 92 |
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[15872] | 93 | my $self = new HTMLPlugin($pluginlist, $inputargs, $hashArgOptLists);
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[10271] | 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 $self = shift (@_);
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[10404] | 101 | my ($textref, $pluginfo, $base_dir, $file, $metadata, $doc_obj, $gli) = @_;
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[10271] | 102 | my $outhandle = $self->{'outhandle'};
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| 103 |
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| 104 | my @head_and_body = split(/<body/i,$$textref);
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| 105 | my $head = shift(@head_and_body);
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| 106 | my $body_text = join("<body", @head_and_body);
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[10600] | 107 | $head =~ m/<title>(.+)<\/title>/i;
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| 108 | my $doctitle = $1 if defined $1;
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[10723] | 109 | if (defined $self->{'metadata_fields'} && $self->{'metadata_fields'}=~ /\S/) {
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[10426] | 110 | my @doc_properties = split(/<xml>/i,$head);
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| 111 | my $doc_heading = shift(@doc_properties);
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| 112 | my $rest_doc_properties = join(" ", @doc_properties);
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[11380] | 113 |
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[10426] | 114 | my @extracted_metadata = split(/<\/xml>/i, $rest_doc_properties);
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| 115 | my $extracted_metadata = shift (@extracted_metadata);
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| 116 | $self->extract_metadata($extracted_metadata, $metadata, $doc_obj);
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| 117 | }
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| 118 |
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[11893] | 119 | # set the title here if we haven't found it yet
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| 120 | if (!defined $doc_obj->get_metadata_element ($doc_obj->get_top_section(), "Title")) {
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| 121 | if (defined $doctitle && $doctitle =~ /\S/) {
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| 122 | $doc_obj->add_metadata($doc_obj->get_top_section(), "Title", $doctitle);
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| 123 | } else {
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| 124 | $self->title_fallback($doc_obj,$doc_obj->get_top_section(),$file);
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| 125 | }
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| 126 | }
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| 127 |
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| 128 | # If delete_toc is enabled, it means to get rid of toc and tof contents.
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[10271] | 129 | # get rid of TOC and TOF sections and their title
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[11380] | 130 | if (defined $self->{'delete_toc'} && ($self->{'delete_toc'} == 1)){
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[10496] | 131 | if (defined $self->{'toc_header'}&& $self->{'toc_header'} =~ /\S/){
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| 132 | $body_text =~ s/<p class=(($self->{'toc_header'})[^>]*)>(.+?)<\/p>//isg;
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| 133 | }
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[10443] | 134 | }
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[10600] | 135 |
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[10496] | 136 | if (defined $self->{'title_header'} && $self->{'title_header'}=~ /\S/){
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[10271] | 137 | $self->{'title_header'} =~ s/^(\()(.*)(\))/$2/is;
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[10600] | 138 | $body_text =~ s/<p class=(($self->{'title_header'})[^>]*)>(.+?)<\/p>/<p class=$1><h1>$3<\/h1><\/p>/isg;
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[10271] | 139 | }
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[10443] | 140 |
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| 141 | if (defined $self->{'level1_header'} && $self->{'level1_header'}=~ /\S/ ){
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| 142 | $self->{'level1_header'} =~ s/^\((.*)\)/$1/i;
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[10595] | 143 | $body_text =~ s/<p class=(($self->{'level1_header'})[^>]*)>(.+?)<\/p>/<p class=$1><h1>$3<\/h1><\/p>/isg;
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[10271] | 144 | }
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[10443] | 145 |
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[10496] | 146 | if (defined $self->{'level2_header'} && $self->{'level2_header'}=~ /\S/){
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[10443] | 147 | $self->{'level2_header'} =~ s/^\((.*)\)/$1/i;
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[10595] | 148 | $body_text =~ s/<p class=(($self->{'level2_header'})[^>]*)>(.+?)<\/p>/<p class=$1><h2>$3<\/h2><\/p>/isg;
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[10271] | 149 | }
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| 150 |
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[10496] | 151 | if (defined $self->{'level3_header'} && $self->{'level3_header'}=~ /\S/ ){
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[10443] | 152 | $self->{'level3_header'} =~ s/^\((.*)\)/$1/is;
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[10271] | 153 | $body_text =~ s/<p class=(($self->{'level3_header'})[^>]*)>(.+?)<\/p>/<p class=$1><h3>$3<\/h3><\/p>/isg;
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| 154 | }
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[11893] | 155 |
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[10271] | 156 | # Tidy up extra new lines
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| 157 | $body_text =~ s/(<p[^>]*><span[^>]*><o:p> <\/o:p><\/span><\/p>)//isg;
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| 158 | $body_text =~ s/(<p[^>]*><o:p> <\/o:p><\/p>)//isg;
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[10426] | 159 |
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[15872] | 160 | # what was the following line for. effectively unused. do we need it??
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| 161 | #$section_text .= "<!--\n<Section>\n-->\n";
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[10600] | 162 | #my $top_section_tag = "<!--\n<Section>\n-->\n";
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| 163 | #$body_text =~ s/(<div.*)/$top_section_text$doctitle$1/i;
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| 164 | #$body_text =~ s/(<div.*)/$top_section_tag$1/i;
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[10271] | 165 | my $body = "<body".$body_text;
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| 166 |
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| 167 | my $section_text = $head;
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[10426] | 168 |
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[10271] | 169 | # split HTML text on <h1>, <h2> etc tags
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| 170 | my @h_split = split(/<h/i,$body);
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[10426] | 171 |
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[10271] | 172 | my $hnum = 0;
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| 173 |
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| 174 | my $sectionh1 = 0;
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| 175 | $section_text .= shift(@h_split);
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[10426] | 176 |
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[10271] | 177 | my $hc;
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| 178 | foreach $hc ( @h_split )
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| 179 | {
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| 180 | if ($hc =~ m/^([1-3])\s*.*?>(.*)$/s)
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| 181 | {
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| 182 | my $new_hnum = $1;
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| 183 | my $hc_after = $2;
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| 184 |
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| 185 | if ($hc_after =~ m/^(.*?)<\/h$new_hnum>/is)
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| 186 | {
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| 187 | my $h_text = $1;
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| 188 | $hc =~ s/^(\ \;)+/\ \;/g;
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| 189 | # boil HTML down to some interesting text
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| 190 | $h_text =~ s/^[1-3]>//;
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| 191 | $h_text =~ s/<\/?.*?>//sg;
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| 192 | $h_text =~ s/\s+/ /sg;
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| 193 | $h_text =~ s/^\s$//s;
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| 194 | $h_text =~ s/( )+\W*/ /sg;
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[10426] | 195 |
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[10271] | 196 | if ($h_text =~ m/\w+/)
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| 197 | {
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| 198 | if ($new_hnum > $hnum)
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| 199 | {
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| 200 | # increase section nesting
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| 201 | $hnum++;
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| 202 | while ($hnum < $new_hnum)
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| 203 | {
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| 204 | my $spacing = " " x $hnum;
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| 205 | $section_text .= "<!--\n";
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| 206 | $section_text .= $spacing."<Section>\n";
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| 207 | $section_text .= "-->\n";
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| 208 | $hnum++;
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| 209 | }
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| 210 | }
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| 211 | else # ($new_hnum <= $hnum)
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| 212 | {
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| 213 | # descrease section nesting
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| 214 | while ($hnum >= $new_hnum)
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| 215 | {
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| 216 | my $spacing = " " x $hnum;
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| 217 | $section_text .= "<!--\n";
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| 218 | $section_text .= $spacing."</Section>\n";
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| 219 | $section_text .= "-->\n";
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| 220 | $hnum--;
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| 221 | }
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| 222 | $hnum++;
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| 223 | }
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| 224 |
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[10600] | 225 | my $spacing = " " x $hnum;
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[10271] | 226 | $section_text .= "<!--\n";
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| 227 | $section_text .= $spacing."<Section>\n";
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| 228 | $section_text .= $spacing." <Description>\n";
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| 229 | $section_text .= $spacing." <Metadata name=\"Title\">$h_text</Metadata>";
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| 230 | $section_text .= $spacing." </Description>\n";
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| 231 | $section_text .= "-->\n";
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| 232 |
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[11893] | 233 | #print $outhandle $spacing."$h_text\n"
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| 234 | # if $self->{'verbosity'} > 2;
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[10426] | 235 |
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[10271] | 236 | $sectionh1++ if ($hnum==1);
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| 237 | }
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| 238 | }
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| 239 | else {
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| 240 | ### print STDERR "***** hc = <h$hc\n\n";
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| 241 | }
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| 242 | $section_text .= "<h$hc";
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| 243 | }
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| 244 | else
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| 245 | {
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| 246 | $section_text .= "<h$hc";
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| 247 | }
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| 248 | }
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| 249 |
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| 250 | while ($hnum >= 1)
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| 251 | {
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| 252 | my $spacing = " " x $hnum;
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| 253 | $section_text .= "<!--\n";
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| 254 | $section_text .= $spacing."</Section>\n";
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| 255 | $section_text .= "-->\n";
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| 256 | $hnum--;
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| 257 | }
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| 258 |
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| 259 | $section_text .= "<!--\n</Section>\n-->\n";
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| 260 |
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| 261 | $$textref = $section_text;
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[10426] | 262 |
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[11893] | 263 | # if ($sectionh1>0)
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| 264 | # {
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| 265 | # print $outhandle " Located section headings ..."
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| 266 | # if $self->{'verbosity'} > 1;
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| 267 | # }
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[10426] | 268 |
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[10271] | 269 | $$textref =~ s/<!\[if !vml\]>/<![if vml]>/g;
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[10426] | 270 |
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[10271] | 271 | $$textref =~ s/( )+/ /sg;
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| 272 |
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[10426] | 273 | ## $$textref =~ s/<o:p> <\/o:p>//g; # used with VML to space figures?
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| 274 |
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[10271] | 275 | $self->SUPER::process(@_);
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[10426] | 276 |
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[10271] | 277 | }
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| 278 |
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| 279 |
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| 280 | sub resize_if_necessary
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| 281 | {
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| 282 | my ($self,$front,$back,$base_dir,$href) = @_;
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[10426] | 283 |
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[10271] | 284 | # dig out width and height of image, if there
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| 285 | my $img_attributes = "$front back";
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| 286 | my ($img_width) = ($img_attributes =~ m/\s+width=\"?(\d+)\"?/i);
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| 287 | my ($img_height) = ($img_attributes =~ m/\s+height=\"?(\d+)\"?/i);
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[10426] | 288 |
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[10271] | 289 | # derive local filename for image based on its URL
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| 290 | my $img_filename = $href;
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| 291 | $img_filename =~ s/^[^:]*:\/\///;
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| 292 | $img_filename = &util::filename_cat($base_dir, $img_filename);
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[10426] | 293 |
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[10271] | 294 | # Replace %20's in URL with a space if required. Note that the filename
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| 295 | # may include the %20 in some situations
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| 296 | if ($img_filename =~ /\%20/) {
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| 297 | if (!-e $img_filename) {
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| 298 | $img_filename =~ s/\%20/ /g;
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| 299 | }
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| 300 | }
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| 301 | if ((-e $img_filename) && (defined $img_width) && (defined $img_height)) {
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| 302 | # get image info on width and height
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[10426] | 303 |
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[10271] | 304 | my $outhandle = $self->{'outhandle'};
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| 305 | my $verbosity = $self->{'verbosity'};
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| 306 |
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| 307 | my ($image_type, $actual_width, $actual_height, $image_size)
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[15872] | 308 | = &ImageConverter::identify($img_filename, $outhandle, $verbosity);
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[10426] | 309 |
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[10356] | 310 | #print STDERR "**** $actual_width x $actual_height";
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| 311 | #print STDERR " (requested: $img_width x $img_height)\n";
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[10271] | 312 |
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| 313 | if (($img_width < $actual_width) || ($img_height < $actual_height)) {
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[11893] | 314 | #print $outhandle "Resizing $img_filename\n" if ($verbosity > 0);
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[10426] | 315 |
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[10271] | 316 | # derive new image name based on current image
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| 317 | my ($tailname, $dirname, $suffix)
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[15872] | 318 | = &File::Basename::fileparse($img_filename, "\\.[^\\.]+\$");
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[10426] | 319 |
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[10271] | 320 | my $resized_filename
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| 321 | = &util::filename_cat($dirname, $tailname."_resized".$suffix);
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[10426] | 322 |
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[10356] | 323 | #print STDERR "**** suffix = $suffix\n";
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[10426] | 324 |
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[10271] | 325 | # Generate smaller image with convert
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[15872] | 326 | my $newsize = "$img_width"."x$img_height";
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[10271] | 327 | my $command = "convert -interlace plane -verbose "
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[15872] | 328 | ."-geometry $newsize \"$img_filename\" \"$resized_filename\"";
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[11893] | 329 | #print $outhandle "ImageResize: $command\n" if ($verbosity > 2);
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| 330 | #my $result = '';
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| 331 | #print $outhandle "ImageResize result: $result\n" if ($verbosity > 2);
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[10271] | 332 | }
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| 333 | }
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| 334 | return $href;
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| 335 | }
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| 336 |
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| 337 | sub replace_images {
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| 338 | my $self = shift (@_);
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| 339 | my ($front, $link, $back, $base_dir,
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| 340 | $file, $doc_obj, $section) = @_;
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| 341 | # remove quotes from link at start and end if necessary
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| 342 | if ($link=~/^\"/) {
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| 343 | $link=~s/^\"//;$link=~s/\"$//;
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| 344 | $front.='"';
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| 345 | $back="\"$back";
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| 346 | }
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[10426] | 347 |
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[10271] | 348 | $link =~ s/\n/ /g;
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[10426] | 349 |
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[10271] | 350 | my ($href, $hash_part, $rl) = $self->format_link ($link, $base_dir, $file);
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[10426] | 351 |
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[10271] | 352 | ## $href = $self->resize_if_necessary($front,$back,$base_dir,$href);
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[10426] | 353 |
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[10271] | 354 | my $middle = $self->add_file ($href, $rl, $hash_part, $base_dir, $doc_obj, $section);
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[10426] | 355 |
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[10271] | 356 | return $front . $middle . $back;
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| 357 | }
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| 358 |
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[10426] | 359 | sub extract_metadata
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| 360 | {
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| 361 | my $self = shift (@_);
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| 362 | my ($textref, $metadata, $doc_obj) = @_;
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| 363 | my $outhandle = $self->{'outhandle'};
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| 364 |
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[11380] | 365 | return if (!defined $textref);
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| 366 |
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[10426] | 367 | # metadata fields to extract/save. 'key' is the (lowercase) name of the
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| 368 | # html meta, 'value' is the metadata name for greenstone to use
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| 369 | my %find_fields = ();
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| 370 | my ($tag,$value);
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[10271] | 371 |
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[10426] | 372 | my $orig_field = "";
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[19993] | 373 | foreach my $field (split /\s*,\s*/, $self->{'metadata_fields'}) {
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[10426] | 374 | # support tag<tagname>
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[19993] | 375 | if ($field =~ /^(.*?)\s*<(.*?)>$/) {
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[10426] | 376 | # "$2" is the user's preferred gs metadata name
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| 377 | $find_fields{lc($1)}=$2; # lc = lowercase
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| 378 | $orig_field = $1;
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| 379 | } else { # no <tagname> for mapping
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| 380 | # "$field" is the user's preferred gs metadata name
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| 381 | $find_fields{lc($field)}=$field; # lc = lowercase
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| 382 | $orig_field = $field;
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| 383 | }
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[11380] | 384 |
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[10426] | 385 | if ($textref =~ m/<o:$orig_field>(.*)<\/o:$orig_field>/i){
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| 386 | $tag = $orig_field;
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| 387 | $value = $1;
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| 388 | if (!defined $value || !defined $tag){
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[15872] | 389 | #print $outhandle "StructuredHTMLPlugin: can't find VALUE in \"$tag\"\n";
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[10426] | 390 | next;
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| 391 | } else {
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| 392 | # clean up and add
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| 393 | chomp($value); # remove trailing \n, if any
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| 394 | $tag = $find_fields{lc($tag)};
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[11893] | 395 | #print $outhandle " extracted \"$tag\" metadata \"$value\"\n"
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| 396 | # if ($self->{'verbosity'} > 2);
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[10426] | 397 | $doc_obj->add_utf8_metadata($doc_obj->get_top_section(), $tag, $value);
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| 398 | }
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| 399 | }
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| 400 | }
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| 401 | }
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| 402 |
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[10271] | 403 | 1;
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