| 1 | ###########################################################################
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| 2 | #
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| 3 | # mgbuildproc.pm --
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| 4 | # A component of the Greenstone digital library software
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| 5 | # from the New Zealand Digital Library Project at the
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| 6 | # University of Waikato, New Zealand.
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| 7 | #
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| 8 | # Copyright (C) 1999 New Zealand Digital Library Project
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| 9 | #
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| 10 | # This program is free software; you can redistribute it and/or modify
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| 11 | # it under the terms of the GNU General Public License as published by
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| 12 | # the Free Software Foundation; either version 2 of the License, or
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| 13 | # (at your option) any later version.
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| 14 | #
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| 15 | # This program is distributed in the hope that it will be useful,
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| 16 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 17 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 18 | # GNU General Public License for more details.
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| 19 | #
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| 20 | # You should have received a copy of the GNU General Public License
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| 21 | # along with this program; if not, write to the Free Software
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| 22 | # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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| 23 | #
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| 24 | ###########################################################################
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| 25 |
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| 26 | # This document processor outputs a document
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| 27 | # for mg to process
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| 28 |
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| 29 |
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| 30 | package mgbuildproc;
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| 31 |
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| 32 | eval {require bytes};
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| 33 |
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| 34 | use classify;
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| 35 | use doc;
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| 36 | use docproc;
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| 37 | use util;
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| 38 |
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| 39 | BEGIN {
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| 40 | @ISA = ('docproc');
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| 41 | }
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| 42 |
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| 43 |
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| 44 | sub new {
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| 45 | my ($class, $collection, $source_dir, $build_dir,
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| 46 | $verbosity, $outhandle) = @_;
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| 47 | my $self = new docproc ();
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| 48 |
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| 49 | # outhandle is where all the debugging info goes
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| 50 | # output_handle is where the output of the plugins is piped
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| 51 | # to (i.e. mg, gdbm etc.)
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| 52 | $outhandle = STDERR unless defined $outhandle;
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| 53 |
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| 54 | $self->{'collection'} = $collection;
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| 55 | $self->{'source_dir'} = $source_dir;
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| 56 | $self->{'build_dir'} = $build_dir;
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| 57 | $self->{'verbosity'} = $verbosity;
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| 58 | $self->{'classifiers'} = [];
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| 59 | $self->{'mode'} = "text";
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| 60 | $self->{'assocdir'} = $build_dir;
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| 61 | $self->{'dontgdbm'} = {};
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| 62 | $self->{'index'} = "section:text";
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| 63 | $self->{'indexexparr'} = [];
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| 64 | $self->{'output_handle'} = "STDOUT";
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| 65 | $self->{'num_docs'} = 0;
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| 66 | $self->{'num_sections'} = 0;
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| 67 | $self->{'num_bytes'} = 0;
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| 68 | $self->{'num_processed_bytes'} = 0;
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| 69 | $self->{'store_text'} = 1;
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| 70 | $self->{'outhandle'} = $outhandle;
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| 71 |
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| 72 | #used by browse interface
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| 73 | $self->{'doclist'} = [];
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| 74 |
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| 75 | $self->{'indexing_text'} = 0;
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| 76 |
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| 77 | return bless $self, $class;
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| 78 | }
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| 79 |
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| 80 | sub reset {
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| 81 | my $self = shift (@_);
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| 82 |
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| 83 | $self->{'num_docs'} = 0;
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| 84 | $self->{'num_sections'} = 0;
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| 85 | $self->{'num_processed_bytes'} = 0;
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| 86 | $self->{'num_bytes'} = 0;
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| 87 | }
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| 88 |
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| 89 | sub get_num_docs {
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| 90 | my $self = shift (@_);
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| 91 |
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| 92 | return $self->{'num_docs'};
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| 93 | }
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| 94 |
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| 95 | sub get_num_sections {
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| 96 | my $self = shift (@_);
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| 97 |
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| 98 | return $self->{'num_sections'};
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| 99 | }
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| 100 |
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| 101 | # num_bytes is the actual number of bytes in the collection
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| 102 | # this is normally the same as what's processed during text compression
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| 103 | sub get_num_bytes {
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| 104 | my $self = shift (@_);
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| 105 |
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| 106 | return $self->{'num_bytes'};
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| 107 | }
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| 108 |
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| 109 | # num_processed_bytes is the number of bytes actually passed
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| 110 | # to mg for the current index
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| 111 | sub get_num_processed_bytes {
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| 112 | my $self = shift (@_);
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| 113 |
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| 114 | return $self->{'num_processed_bytes'};
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| 115 | }
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| 116 |
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| 117 | sub set_output_handle {
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| 118 | my $self = shift (@_);
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| 119 | my ($handle) = @_;
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| 120 |
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| 121 | $self->{'output_handle'} = $handle;
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| 122 | }
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| 123 |
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| 124 | sub set_mode {
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| 125 | my $self = shift (@_);
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| 126 | my ($mode) = @_;
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| 127 |
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| 128 | $self->{'mode'} = $mode;
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| 129 | }
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| 130 |
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| 131 | sub set_assocdir {
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| 132 | my $self = shift (@_);
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| 133 | my ($assocdir) = @_;
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| 134 |
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| 135 | $self->{'assocdir'} = $assocdir;
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| 136 | }
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| 137 |
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| 138 | sub set_dontgdbm {
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| 139 | my $self = shift (@_);
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| 140 | my ($dontgdbm) = @_;
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| 141 |
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| 142 | $self->{'dontgdbm'} = $dontgdbm;
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| 143 | }
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| 144 |
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| 145 | sub set_index {
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| 146 | my $self = shift (@_);
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| 147 | my ($index, $indexexparr) = @_;
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| 148 |
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| 149 | $self->{'index'} = $index;
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| 150 | $self->{'indexexparr'} = $indexexparr if defined $indexexparr;
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| 151 | }
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| 152 |
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| 153 | sub get_index {
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| 154 | my $self = shift (@_);
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| 155 |
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| 156 | return $self->{'index'};
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| 157 | }
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| 158 |
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| 159 | sub set_classifiers {
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| 160 | my $self = shift (@_);
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| 161 | my ($classifiers) = @_;
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| 162 |
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| 163 | $self->{'classifiers'} = $classifiers;
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| 164 | }
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| 165 |
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| 166 | sub set_indexing_text {
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| 167 | my $self = shift (@_);
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| 168 | my ($indexing_text) = @_;
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| 169 |
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| 170 | $self->{'indexing_text'} = $indexing_text;
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| 171 | }
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| 172 |
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| 173 | sub get_indexing_text {
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| 174 | my $self = shift (@_);
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| 175 |
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| 176 | return $self->{'indexing_text'};
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| 177 | }
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| 178 |
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| 179 | sub set_store_text {
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| 180 | my $self = shift (@_);
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| 181 | my ($store_text) = @_;
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| 182 |
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| 183 | $self->{'store_text'} = $store_text;
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| 184 | }
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| 185 |
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| 186 | sub get_doc_list {
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| 187 | my $self = shift(@_);
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| 188 |
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| 189 | return @{$self->{'doclist'}};
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| 190 | }
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| 191 |
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| 192 |
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| 193 | sub process {
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| 194 | my $self = shift (@_);
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| 195 | my $method = $self->{'mode'};
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| 196 |
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| 197 | $self->$method(@_);
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| 198 | }
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| 199 |
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| 200 | # use 'Paged' if document has no more than 2 levels
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| 201 | # and each section at second level has a number for
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| 202 | # Title metadata
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| 203 | #also use Paged if gsdlthistype metadata is set to Paged
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| 204 | sub get_document_type {
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| 205 | my $self = shift (@_);
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| 206 | my ($doc_obj) = @_;
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| 207 |
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| 208 | my $thistype = "VList";
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| 209 | my $childtype = "VList";
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| 210 | my $title;
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| 211 | my @tmp = ();
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| 212 |
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| 213 | my $section = $doc_obj->get_top_section ();
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| 214 |
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| 215 | my $gsdlthistype = $doc_obj->get_metadata_element ($section, "gsdlthistype");
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| 216 | if (defined $gsdlthistype) {
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| 217 | if ($gsdlthistype eq "Paged") {
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| 218 | $thistype = "Paged";
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| 219 | $childtype = "Paged";
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| 220 | return ($thistype, $childtype);
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| 221 | } elsif ($gsdlthistype eq "Hierarchy") {
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| 222 | return ($thistype, $childtype); # use VList, VList
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| 223 | }
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| 224 | }
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| 225 | my $first = 1;
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| 226 | while (defined $section) {
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| 227 | @tmp = split /\./, $section;
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| 228 | if (scalar(@tmp) > 1) {
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| 229 | return ($thistype, $childtype);
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| 230 | }
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| 231 | if (!$first) {
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| 232 | $title = $doc_obj->get_metadata_element ($section, "Title");
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| 233 | if (!defined $title || $title !~ /^\d+$/) {
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| 234 | return ($thistype, $childtype);
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| 235 | }
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| 236 | }
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| 237 | $first = 0;
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| 238 | $section = $doc_obj->get_next_section($section);
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| 239 | }
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| 240 | if ($doc_obj->get_text_length ($doc_obj->get_top_section())) {
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| 241 | $thistype = "Paged";
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| 242 | } else {
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| 243 | $thistype = "Invisible";
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| 244 | }
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| 245 | $childtype = "Paged";
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| 246 | return ($thistype, $childtype);
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| 247 | }
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| 248 |
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| 249 | sub assoc_files {
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| 250 | my $self = shift (@_);
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| 251 | my ($doc_obj, $archivedir) = @_;
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| 252 | my ($afile);
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| 253 |
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| 254 | foreach my $assoc_file (@{$doc_obj->get_assoc_files()}) {
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| 255 | # if assoc file starts with a slash, we put it relative to the assoc
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| 256 | # dir, otherwise it is relative to the HASH... directory
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| 257 | if ($assoc_file->[1] =~ m@^[/\\]@) {
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| 258 | $afile = &util::filename_cat($self->{'assocdir'},$assoc_file->[1]);
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| 259 | } else {
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| 260 | $afile = &util::filename_cat($self->{'assocdir'}, $archivedir, $assoc_file->[1]);
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| 261 | }
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| 262 | &util::hard_link ($assoc_file->[0], $afile);
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| 263 | }
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| 264 | }
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| 265 |
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| 266 | sub infodb {
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| 267 | my $self = shift (@_);
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| 268 | my ($doc_obj, $filename) = @_;
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| 269 | my $handle = $self->{'output_handle'};
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| 270 | # $handle = "main::STDOUT";
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| 271 |
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| 272 | my $doctype = $doc_obj->get_doc_type();
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| 273 |
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| 274 | # only output this document if it is one to be indexed
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| 275 | return if ($doctype ne "indexed_doc");
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| 276 |
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| 277 | my ($archivedir) = $filename =~ /^(.*?)(?:\/|\\)[^\/\\]*$/;
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| 278 | $archivedir = "" unless defined $archivedir;
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| 279 | $archivedir =~ s/\\/\//g;
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| 280 | $archivedir =~ s/^\/+//;
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| 281 | $archivedir =~ s/\/+$//;
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| 282 |
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| 283 | $self->assoc_files ($doc_obj, $archivedir);
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| 284 |
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| 285 | # this is another document
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| 286 | $self->{'num_docs'} += 1 unless ($doctype eq "classification");
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| 287 |
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| 288 | # is this a paged or a hierarchical document
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| 289 | my ($thistype, $childtype) = $self->get_document_type ($doc_obj);
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| 290 |
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| 291 | my $section = $doc_obj->get_top_section ();
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| 292 | my $doc_OID = $doc_obj->get_OID();
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| 293 | my $first = 1;
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| 294 | my $url = "";
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| 295 | while (defined $section) {
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| 296 | # update a few statistics
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| 297 | $self->{'num_bytes'} += $doc_obj->get_text_length ($section);
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| 298 | $self->{'num_sections'} += 1 unless ($doctype eq "classification");
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| 299 |
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| 300 | # output the section name
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| 301 | if ($section eq "") { print $handle "[$doc_OID]\n"; }
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| 302 | else { print $handle "[$doc_OID.$section]\n"; }
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| 303 |
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| 304 | # output the fact that this document is a document (unless doctype
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| 305 | # has been set to something else from within a plugin
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| 306 | my $dtype = $doc_obj->get_metadata_element ($section, "doctype");
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| 307 | if (!defined $dtype || $dtype !~ /\w/) {
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| 308 | print $handle "<doctype>doc\n";
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| 309 | }
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| 310 |
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| 311 | # output whether this node contains text
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| 312 | if ($doc_obj->get_text_length($section) > 0) {
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| 313 | print $handle "<hastxt>1\n";
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| 314 | } else {
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| 315 | print $handle "<hastxt>0\n";
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| 316 | }
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| 317 |
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| 318 | # output all the section metadata
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| 319 | my $metadata = $doc_obj->get_all_metadata ($section);
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| 320 | foreach my $pair (@$metadata) {
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| 321 | my ($field, $value) = (@$pair);
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| 322 |
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| 323 | if ($field ne "Identifier" && $field !~ /^gsdl/ &&
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| 324 | defined $value && $value ne "") {
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| 325 |
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| 326 | # escape problematic stuff
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| 327 | $value =~ s/\\/\\\\/g;
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| 328 | $value =~ s/\n/\\n/g;
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| 329 | $value =~ s/\r/\\r/g;
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| 330 | if ($value =~ /-{70,}/) {
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| 331 | # if value contains 70 or more hyphens in a row we need
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| 332 | # to escape them to prevent txt2db from treating them
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| 333 | # as a separator
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| 334 | $value =~ s/-/&\#045;/gi;
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| 335 | }
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| 336 |
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| 337 | # special case for URL metadata
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| 338 | if ($field =~ /^URL$/i) {
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| 339 | $url .= "[$value]\n";
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| 340 | if ($section eq "") {$url .= "<section>$doc_OID\n";}
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| 341 | else {$url .= "<section>$doc_OID.$section\n";}
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| 342 | $url .= '-' x 70 . "\n";
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| 343 | }
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| 344 |
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| 345 | if (!defined $self->{'dontgdbm'}->{$field}) {
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| 346 | print $handle "<$field>$value\n";
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| 347 | }
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| 348 | }
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| 349 | }
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| 350 |
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| 351 | # output archivedir if at top level
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| 352 | if ($section eq $doc_obj->get_top_section()) {
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| 353 | print $handle "<archivedir>$archivedir\n";
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| 354 | }
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| 355 |
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| 356 | # output document display type
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| 357 | if ($first) {
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| 358 | print $handle "<thistype>$thistype\n";
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| 359 | }
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| 360 |
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| 361 | # output a list of children
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| 362 | my $children = $doc_obj->get_children ($section);
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| 363 | if (scalar(@$children) > 0) {
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| 364 | print $handle "<childtype>$childtype\n";
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| 365 | print $handle "<contains>";
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| 366 | my $firstchild = 1;
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| 367 | foreach my $child (@$children) {
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| 368 | print $handle ";" unless $firstchild;
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| 369 | $firstchild = 0;
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| 370 | if ($child =~ /^.*?\.(\d+)$/) {
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| 371 | print $handle "\".$1";
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| 372 | } else {
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| 373 | print $handle "\".$child";
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| 374 | }
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| 375 | # if ($child eq "") { print $handle "$doc_OID"; }
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| 376 | # elsif ($section eq "") { print $handle "$doc_OID.$child"; }
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| 377 | # else { print $handle "$doc_OID.$section.$child"; }
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| 378 | }
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| 379 | print $handle "\n";
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| 380 | }
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| 381 |
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| 382 | # output the matching document number
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| 383 | print $handle "<docnum>$self->{'num_sections'}\n";
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| 384 |
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| 385 | print $handle '-' x 70, "\n";
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| 386 |
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| 387 |
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| 388 | # output a database entry for the document number
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| 389 | print $handle "[$self->{'num_sections'}]\n";
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| 390 | if ($section eq "") { print $handle "<section>$doc_OID\n"; }
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| 391 | else { print $handle "<section>$doc_OID.$section\n"; }
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| 392 | print $handle '-' x 70, "\n";
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| 393 |
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| 394 | # output entry for url
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| 395 | if ($url ne "") {
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| 396 | print $handle $url;
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| 397 | }
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| 398 |
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| 399 | $first = 0;
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| 400 | $section = $doc_obj->get_next_section($section);
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| 401 | }
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| 402 |
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| 403 | #add this document to the browse structure
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| 404 | push(@{$self->{'doclist'}},$doc_obj->get_OID())
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| 405 | unless ($doctype eq "classification");
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| 406 |
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| 407 | # classify this document
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| 408 | &classify::classify_doc ($self->{'classifiers'}, $doc_obj);
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| 409 |
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| 410 | }
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| 411 |
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| 412 | sub find_paragraphs {
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| 413 | $_[1] =~ s/(<p\b)/\cC$1/gi;
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| 414 | }
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| 415 |
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| 416 | sub filter_text {
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| 417 | # $self->filter_text ($field, $new_text);
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| 418 | # don't want to do anything for this version, however,
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| 419 | # in a particular collection you might want to override
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| 420 | # this method to post-process certain fields depending on
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| 421 | # the field, or whether we are outputting it for indexing
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| 422 | }
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| 423 |
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| 424 | sub text {
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| 425 | my $self = shift (@_);
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| 426 | my ($doc_obj) = @_;
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| 427 | my $handle = $self->{'output_handle'};
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| 428 | my $indexed_doc = 1;
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| 429 |
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| 430 | # only output this document if it is one to be indexed
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| 431 | return if ($doc_obj->get_doc_type() ne "indexed_doc");
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| 432 |
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| 433 | # see if this document belongs to this subcollection
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| 434 | foreach my $indexexp (@{$self->{'indexexparr'}}) {
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| 435 | $indexed_doc = 0;
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| 436 | my ($field, $exp, $options) = split /\//, $indexexp;
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| 437 | if (defined ($field) && defined ($exp)) {
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| 438 | my ($bool) = $field =~ /^(.)/;
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| 439 | $field =~ s/^.// if $bool eq '!';
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| 440 | if ($field =~ /^filename$/i) {
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| 441 | $field = $doc_obj->get_source_filename();
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| 442 | } else {
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| 443 | $field = $doc_obj->get_metadata_element($doc_obj->get_top_section(), $field);
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| 444 | }
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| 445 | next unless defined $field;
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| 446 | if ($bool eq '!') {
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| 447 | if ($options =~ /^i$/i) {
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| 448 | if ($field !~ /$exp/i) {$indexed_doc = 1; last;}
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| 449 | } else {
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| 450 | if ($field !~ /$exp/) {$indexed_doc = 1; last;}
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| 451 | }
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| 452 | } else {
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| 453 | if ($options =~ /^i$/i) {
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| 454 | if ($field =~ /$exp/i) {$indexed_doc = 1; last;}
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| 455 | } else {
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| 456 | if ($field =~ /$exp/) {$indexed_doc = 1; last;}
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| 457 | }
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| 458 | }
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| 459 | }
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| 460 | }
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| 461 |
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| 462 | # this is another document
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| 463 | $self->{'num_docs'} += 1;
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| 464 |
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| 465 | # get the parameters for the output
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| 466 | my ($level, $fields) = split (/:/, $self->{'index'});
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| 467 | $fields =~ s/\ball\b/Title,Creator,text/;
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| 468 | $fields =~ s/\btopall\b/topTitle,topCreator,toptext/;
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| 469 |
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| 470 | my $doc_section = 0; # just for this document
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| 471 | my $text = "";
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| 472 | my $text_extra = "";
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| 473 |
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| 474 | # get the text for this document
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| 475 | my $section = $doc_obj->get_top_section();
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| 476 | while (defined $section) {
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| 477 | # update a few statistics
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| 478 | $doc_section++;
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| 479 | $self->{'num_sections'} += 1;
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| 480 |
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| 481 | if ($indexed_doc) {
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| 482 | $self->{'num_bytes'} += $doc_obj->get_text_length ($section);
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| 483 | foreach my $field (split (/,/, $fields)) {
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| 484 | # only deal with this field if it doesn't start with top or
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| 485 | # this is the first section
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| 486 | my $real_field = $field;
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| 487 | if (!($real_field =~ s/^top//) || ($doc_section == 1)) {
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| 488 | my $new_text = "";
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| 489 | if ($level eq "dummy") {
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| 490 | # a dummy index is a special case used when no
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| 491 | # indexes are specified (since there must always be
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| 492 | # at least one index or we can't retrieve the
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| 493 | # compressed text) - we add a small amount of text
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| 494 | # to these dummy indexes which will never be seen
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| 495 | # but will overcome mg's problems with building
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| 496 | # empty indexes
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| 497 | $new_text = "this is dummy text to stop mg barfing";
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| 498 | $self->{'num_processed_bytes'} += length ($new_text);
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| 499 |
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| 500 | } elsif ($real_field eq "text") {
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| 501 | $new_text = $doc_obj->get_text ($section) if $self->{'store_text'};
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| 502 | $self->{'num_processed_bytes'} += length ($new_text);
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| 503 | $new_text =~ s/[\cB\cC]//g;
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| 504 | $self->find_paragraphs($new_text);
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| 505 |
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| 506 | } else {
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| 507 | my $first = 1;
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| 508 | foreach $meta (@{$doc_obj->get_metadata ($section, $real_field)}) {
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| 509 | $meta =~ s/[\cB\cC]//g;
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| 510 | $self->{'num_processed_bytes'} += length ($meta);
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| 511 | $new_text .= "\cC" unless $first;
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| 512 | $new_text .= $meta if $self->{'store_text'};
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| 513 | $first = 0;
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| 514 | }
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| 515 | }
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| 516 |
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| 517 | # filter the text
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| 518 | $self->filter_text ($field, $new_text);
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| 519 |
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| 520 | $text .= "$new_text\cC";
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| 521 | }
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| 522 | }
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| 523 | }
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| 524 |
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| 525 | if ($level eq "document") { $text_extra .= "\cB"; }
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| 526 | else { $text .= "\cB"; }
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| 527 |
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| 528 | $section = $doc_obj->get_next_section($section);
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| 529 | }
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| 530 |
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| 531 | print $handle "$text$text_extra";
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| 532 | }
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| 533 |
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| 534 | 1;
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| 535 |
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