root/main/trunk/greenstone2/perllib/docprint.pm @ 32518

Revision 32518, 4.1 KB (checked in by ak19, 21 months ago)

Untested first attempt at MySQLPlugout that is meant to write metadata and/or fulltext to a mysql db rather than to doc.xml. We're switching over to using perl mysql libs, dbd (mysql) for drivers and dbi (mysql), for db access. However, I still want to commit this initial attempt at manually doing database operations in perl.

  • Property svn:executable set to *
  • Property svn:keywords set to Author Date Id Revision
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1###########################################################################
2#
3# docprint.pm --
4# A component of the Greenstone digital library software
5# from the New Zealand Digital Library Project at the
6# University of Waikato, New Zealand.
7#
8# Copyright (C) 2006 New Zealand Digital Library Project
9#
10# This program is free software; you can redistribute it and/or modify
11# it under the terms of the GNU General Public License as published by
12# the Free Software Foundation; either version 2 of the License, or
13# (at your option) any later version.
14#
15# This program is distributed in the hope that it will be useful,
16# but WITHOUT ANY WARRANTY; without even the implied warranty of
17# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18# GNU General Public License for more details.
19#
20# You should have received a copy of the GNU General Public License
21# along with this program; if not, write to the Free Software
22# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23#
24###########################################################################
25
26# This is used to output an XML representation of a doc_obj - this will be
27# Greenstone XML format.
28# This is used by GreenstoneXMLPlugout and doc.pm
29
30package docprint;
31
32use constant OUTPUT_NONE => 0;
33use constant OUTPUT_META_ONLY => 1;
34use constant OUTPUT_TEXT_ONLY => 2;
35use constant OUTPUT_ALL => 3;
36
37use strict;
38
39sub get_section_xml {
40    return &get_section_xml_from_root(@_);
41}
42
43sub get_section_xml_from_root {
44    my ($doc_obj, $options) = @_;
45    return &recursive_get_section_xml($doc_obj, $doc_obj->get_top_section(), $options);
46}
47
48sub recursive_get_section_xml {   
49    my ($doc_obj, $section, $options) = @_;
50   
51    # 'output' can be OUTPUT_ALL|OUTPUT_META_ONLY|OUTPUT_TEXT_ONLY|OUTPUT_NONE
52    # If not provided, it defaults to OUTPUT_ALL.
53    # If OUTPUT_ALL, the metadata and full text both go into doc.xml
54    # If OUTPUT_META_ONLY, the metadata goes into doc.xml and full text goes elsewhere (mysql db).
55    # If OUTPUT_TEXT_ONLY, the full text goes into doc.xml and metadata goes elsewhere (mysql db).
56    # If OUTPUT_NONE, the full text and metadata goes elsewhere (mysql db)
57    # In the last 3 cases, an XML comment is left behind as a 'breadcrumb' to indicate
58    # that the "missing" doc information is stored elsewhere.
59    if(!defined $options) {
60    $options = { 'output' => OUTPUT_ALL };
61    }
62   
63    my $section_ptr = $doc_obj->_lookup_section ($section);
64    return "" unless defined $section_ptr;
65
66    my $all_text = "<Section>\n";
67    $all_text .= "  <Description>\n";
68
69    # scalar comparisons on a constant is allowed (but not string evaluation of scalars)
70    # https://www.perlmonks.org/?node_id=559456
71    if($options->{'output'} == OUTPUT_ALL || $options->{'output'} == OUTPUT_META_ONLY) {
72    # output metadata
73    foreach my $data (@{$section_ptr->{'metadata'}}) {
74        my $escaped_value = &escape_text($data->[1]);
75        $all_text .= '    <Metadata name="' . $data->[0] . '">' . $escaped_value . "</Metadata>\n";
76    }
77    } else {
78    $all_text .= "<!-- metadata is stored elsewhere (MySQL database) -->\n";
79    }
80
81    $all_text .= "  </Description>\n";
82
83    # output the text
84    $all_text .= "  <Content>";
85    if($options->{'output'} == OUTPUT_ALL || $options->{'output'} == OUTPUT_TEXT_ONLY) {
86    $all_text .= &escape_text($section_ptr->{'text'});
87    } else {
88    $all_text .= "<!-- full text is stored elsewhere (MySQL database) -->\n";
89    }
90    $all_text .= "</Content>\n";
91   
92    # output all the subsections
93    foreach my $subsection (@{$section_ptr->{'subsection_order'}}) {
94    $all_text .= &recursive_get_section_xml($doc_obj, "$section.$subsection");
95    }
96   
97    $all_text .=  "</Section>\n";
98
99    # make sure no nasty control characters have snuck through
100    # (XML::Parser will barf on anything it doesn't consider to be
101    # valid UTF-8 text, including things like \c@, \cC etc.)
102    $all_text =~ s/[\x00-\x09\x0B\x0C\x0E-\x1F]//g;
103
104    return $all_text;
105}
106
107sub escape_text {
108    my ($text) = @_;
109    # special characters in the xml encoding
110    $text =~ s/&&/& &/g;
111    $text =~ s/&/&amp;/g; # this has to be first...
112    $text =~ s/</&lt;/g;
113    $text =~ s/>/&gt;/g;
114    $text =~ s/\"/&quot;/g;
115
116    return $text;
117}
118
1191;
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