| 1 | ###########################################################################
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| 2 | #
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| 3 | # mgppbuildproc.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 mgpp to process
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| 28 |
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| 29 |
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| 30 | package mgppbuildproc;
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| 31 |
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| 32 | use basebuildproc;
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| 33 | use cnseg;
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| 34 |
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| 35 | use strict;
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| 36 | no strict 'refs'; # allow filehandles to be variables and viceversa
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| 37 |
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| 38 |
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| 39 | BEGIN {
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| 40 | @mgppbuildproc::ISA = ('basebuildproc');
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| 41 | }
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| 42 |
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| 43 | #this must be the same as in mgppbuilder
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| 44 | our %level_map = ('document'=>'Doc',
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| 45 | 'section'=>'Sec',
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| 46 | 'paragraph'=>'Para');
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| 47 |
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| 48 | sub new {
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| 49 | my $class = shift @_;
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| 50 | my $self = new basebuildproc (@_);
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| 51 |
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| 52 | # use a different index specification to the default
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| 53 | $self->{'index'} = "text";
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| 54 |
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| 55 | $self->{'dontindex'} = {};
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| 56 | $self->{'indexfieldmap'} = {};
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| 57 | $self->{'indexfields'} = {}; # only put in the ones that are not specified directly in the index
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| 58 | $self->{'strip_html'}=1;
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| 59 |
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| 60 | return bless $self, $class;
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| 61 | }
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| 62 |
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| 63 |
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| 64 | sub set_indexfieldmap {
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| 65 | my $self = shift (@_);
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| 66 | my ($indexmap) = @_;
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| 67 |
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| 68 | $self->{'indexfieldmap'} = $indexmap;
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| 69 | }
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| 70 |
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| 71 | sub get_indexfieldmap {
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| 72 | my $self = shift (@_);
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| 73 |
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| 74 | return $self->{'indexfieldmap'};
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| 75 | }
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| 76 |
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| 77 | sub set_levels {
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| 78 | my $self = shift (@_);
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| 79 | my ($levels) = @_;
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| 80 |
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| 81 | $self->{'levels'} = $levels;
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| 82 | }
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| 83 |
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| 84 | sub set_strip_html {
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| 85 | my $self = shift (@_);
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| 86 | my ($strip) = @_;
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| 87 | $self->{'strip_html'}=$strip;
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| 88 | }
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| 89 |
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| 90 | #sub find_paragraphs {
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| 91 | # $_[1] =~ s/(<p\b)/<Paragraph>$1/gi;
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| 92 | #}
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| 93 |
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| 94 | sub remove_gtlt {
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| 95 | my $self =shift(@_);
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| 96 | my ($text, $para) = @_;
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| 97 | $text =~s/[<>]//g;
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| 98 | return "$para$text$para";
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| 99 | }
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| 100 |
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| 101 | sub process_tags {
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| 102 | my $self = shift(@_);
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| 103 | my ($text, $para) = @_;
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| 104 | if ($text =~ /^p\b/i) {
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| 105 | return $para;
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| 106 | }
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| 107 | return "";
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| 108 | }
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| 109 |
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| 110 | sub preprocess_text {
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| 111 | my $self = shift (@_);
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| 112 | my ($text, $strip_html, $para) = @_;
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| 113 | # at this stage, we do not do paragraph tags unless have strip_html -
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| 114 | # it will result in a huge mess of non-xml
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| 115 | return unless $strip_html;
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| 116 |
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| 117 | my $new_text = $text;
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| 118 |
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| 119 | # if we have <pre> tags, we can have < > inside them, need to delete
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| 120 | # the <> before stripping tags
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| 121 | $new_text =~ s/<pre>(.*?)<\/pre>/$self->remove_gtlt($1,$para)/gse;
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| 122 |
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| 123 | if ($para eq "") {
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| 124 | # just remove all tags
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| 125 | $new_text =~ s/<[^>]*>//gs;
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| 126 | } else {
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| 127 | # strip all tags except <p> tags which get turned into $para
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| 128 | $new_text =~ s/<([^>]*)>/$self->process_tags($1, $para)/gse;
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| 129 |
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| 130 | }
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| 131 | return $new_text;
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| 132 | }
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| 133 | #this function strips the html tags from the doc if ($strip_html) and
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| 134 | # if ($para) replaces <p> with <Paragraph> tags.
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| 135 | # if both are false, the original text is returned
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| 136 | #assumes that <pre> and </pre> have no spaces, and removes all < and > inside
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| 137 | #these tags
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| 138 | sub preprocess_text_old_and_slow {
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| 139 | my $self = shift (@_);
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| 140 | my ($text, $strip_html, $para) = @_;
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| 141 | my ($outtext) = "";
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| 142 | if ($strip_html) {
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| 143 | while ($text =~ /<([^>]*)>/ && $text ne "") {
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| 144 |
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| 145 | my $tag = $1;
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| 146 | $outtext .= $`." "; #add everything before the matched tag
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| 147 | $text = $'; #'everything after the matched tag
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| 148 | if ($para && $tag =~ /^\s*p\s/i) {
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| 149 | $outtext .= $para;
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| 150 | }
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| 151 | elsif ($tag =~ /^pre$/) { # a pre tag
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| 152 | $text =~ /<\/pre>/; # find the closing pre tag
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| 153 | my $tmp_text = $`; #everything before the closing pre tag
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| 154 | $text = $'; #'everything after the </pre>
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| 155 | $tmp_text =~ s/[<>]//g; # remove all < and >
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| 156 | $outtext.= $tmp_text . " ";
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| 157 | }
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| 158 | }
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| 159 |
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| 160 | $outtext .= $text; # add any remaining text
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| 161 | return $outtext;
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| 162 | } #if strip_html
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| 163 |
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| 164 | #if ($para) {
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| 165 | #$text =~ s/(<p\b)/$para$1/gi;
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| 166 | #return $text;
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| 167 | # }
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| 168 | return $text;
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| 169 | }
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| 170 |
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| 171 | sub text {
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| 172 | my $self = shift (@_);
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| 173 | my ($doc_obj) = @_;
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| 174 | my $handle = $self->{'output_handle'};
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| 175 | my $outhandle = $self->{'outhandle'};
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| 176 |
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| 177 | # only output this document if it is one to be indexed
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| 178 | return if ($doc_obj->get_doc_type() ne "indexed_doc");
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| 179 |
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| 180 | my $indexed_doc = $self->is_subcollection_doc($doc_obj);
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| 181 |
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| 182 | # this is another document
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| 183 | $self->{'num_docs'} += 1;
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| 184 |
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| 185 | # get the parameters for the output
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| 186 | # split on : just in case there is subcoll and lang stuff
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| 187 | my ($fields) = split (/:/, $self->{'index'});
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| 188 |
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| 189 | # we always do text and index on Doc and Sec levels
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| 190 | my ($documenttag) = "\n<". $level_map{'document'} . ">\n";
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| 191 | my ($documentendtag) = "\n</". $level_map{'document'} . ">\n";
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| 192 | my ($sectiontag) = "\n<". $level_map{'section'} . ">\n";
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| 193 | my ($sectionendtag) = "\n</". $level_map{'section'} . ">\n";
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| 194 |
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| 195 | my ($paratag) = "";
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| 196 |
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| 197 | # paragraph tags will only be used for indexing (can't retrieve
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| 198 | # paragraphs), and can ony be used if we are stripping HTML tags
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| 199 | if ($self->{'indexing_text'} && $self->{'levels'}->{'paragraph'}) {
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| 200 | if ($self->{'strip_html'}) {
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| 201 | $paratag = "<". $level_map{'paragraph'} . ">";
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| 202 | } else {
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| 203 | print $outhandle "Paragraph level can not be used with no_strip_html!. Not indexing Paragraphs.\n";
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| 204 | }
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| 205 | }
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| 206 |
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| 207 | my $doc_section = 0; # just for this document
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| 208 |
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| 209 | my $text = $documenttag;
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| 210 |
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| 211 | # get the text for this document
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| 212 | my $section = $doc_obj->get_top_section();
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| 213 |
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| 214 | while (defined $section) {
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| 215 | # update a few statistics
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| 216 | $doc_section++;
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| 217 | $self->{'num_sections'} += 1;
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| 218 | $text .= "$sectiontag";
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| 219 |
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| 220 | my $indexed_section = $doc_obj->get_metadata_element($section, "gsdldoctype") || "indexed_section";
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| 221 | if (($indexed_doc == 0) || ($indexed_section ne "indexed_section" && $indexed_section ne "indexed_doc")) {
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| 222 | # we are not actually indexing anything for this document,
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| 223 | # but we want to keep the section numbers the same, so we just
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| 224 | # output section tags for each section (which is done above)
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| 225 | $text .= "$sectionendtag";
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| 226 | $section = $doc_obj->get_next_section($section);
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| 227 | next;
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| 228 | }
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| 229 |
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| 230 | $self->{'num_bytes'} += $doc_obj->get_text_length ($section);
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| 231 | foreach my $field (split (/;/, $fields)) {
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| 232 | # only deal with this field if it doesn't start with top or
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| 233 | # this is the first section
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| 234 | my $real_field = $field;
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| 235 | next if (($real_field =~ s/^top//) && ($doc_section != 1));
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| 236 |
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| 237 | my $new_text = "";
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| 238 |
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| 239 | # we get allfields by default - do nothing
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| 240 | if ($real_field eq "allfields") {
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| 241 |
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| 242 | }
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| 243 |
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| 244 | # metadata - output all metadata we know about except gsdl stuff
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| 245 | elsif ($real_field eq "metadata") {
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| 246 | my $shortname = "";
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| 247 | my $metadata = $doc_obj->get_all_metadata ($section);
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| 248 | foreach my $pair (@$metadata) {
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| 249 | my ($mfield, $mvalue) = (@$pair);
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| 250 | # check fields here, maybe others dont want - change to use dontindex!!
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| 251 | if ($mfield ne "Identifier"
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| 252 | && $mfield !~ /^gsdl/
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| 253 | && $mfield ne "classifytype"
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| 254 | && $mfield ne "assocfilepath"
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| 255 | && defined $mvalue && $mvalue ne "") {
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| 256 |
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| 257 | if (defined $self->{'indexfieldmap'}->{$mfield}) {
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| 258 | $shortname = $self->{'indexfieldmap'}->{$mfield};
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| 259 | }
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| 260 | else {
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| 261 | $shortname = $self->create_shortname($mfield);
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| 262 | $self->{'indexfieldmap'}->{$mfield} = $shortname;
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| 263 | $self->{'indexfieldmap'}->{$shortname} = 1;
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| 264 | }
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| 265 | $new_text .= "$paratag<$shortname>$mvalue</$shortname>\n";
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| 266 | if (!defined $self->{'indexfields'}->{$mfield}) {
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| 267 | $self->{'indexfields'}->{$mfield} = 1;
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| 268 | }
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| 269 | }
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| 270 | }
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| 271 | }
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| 272 | else {
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| 273 | #individual metadata and or text specified - could be
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| 274 | # a comma separated list
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| 275 | my $shortname="";
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| 276 | if (defined $self->{'indexfieldmap'}->{$real_field}) {
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| 277 | $shortname = $self->{'indexfieldmap'}->{$real_field};
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| 278 | }
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| 279 | else {
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| 280 | $shortname = $self->create_shortname($real_field);
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| 281 | $self->{'indexfieldmap'}->{$real_field} = $shortname;
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| 282 | $self->{'indexfieldmap'}->{$shortname} = 1;
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| 283 | }
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| 284 | # we only want one tag around the index
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| 285 | $new_text .= "$paratag<$shortname>";
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| 286 | my @metadata_list = ();
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| 287 | foreach my $submeta (split /,/, $real_field) {
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| 288 | if ($submeta eq "text") {
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| 289 | my $section_text = $doc_obj->get_text($section);
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| 290 | if ($self->{'indexing_text'}) {
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| 291 | if ($paratag ne "") {
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| 292 | # we fiddle around with splitting text into paragraphs
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| 293 | $new_text .= "</$shortname>$paratag<$shortname>\n";
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| 294 | $section_text = $self->preprocess_text($section_text, $self->{'strip_html'}, "</$shortname>$paratag<$shortname>");
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| 295 | }
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| 296 | else {
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| 297 | $section_text = $self->preprocess_text($section_text, $self->{'strip_html'}, "");
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| 298 | }
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| 299 | $new_text .= "$section_text</$shortname><$shortname>\n";
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| 300 | }
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| 301 | else {
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| 302 | # leave html stuff in, and don't add Paragraph tags - never retrieve paras at the moment
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| 303 | $new_text .= $section_text;
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| 304 | }
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| 305 | }
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| 306 | else {
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| 307 | my @section_metadata = @{$doc_obj->get_metadata ($section, $submeta)};
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| 308 | if ($section ne $doc_obj->get_top_section() && $self->{'indexing_text'} && defined ($self->{'sections_index_document_metadata'})) {
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| 309 | if ($self->{'sections_index_document_metadata'} eq "always" || ( scalar(@section_metadata) == 0 && $self->{'sections_index_document_metadata'} eq "unless_section_metadata_exists")) {
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| 310 | push (@section_metadata, @{$doc_obj->get_metadata ($doc_obj->get_top_section(), $submeta)});
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| 311 | }
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| 312 | }
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| 313 | push (@metadata_list, @section_metadata);
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| 314 | }
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| 315 | }
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| 316 | foreach my $item (@metadata_list) {
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| 317 | #$new_text .= "$paratag<$shortname>$item</$shortname>\n";
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| 318 | $new_text .= "$item ";
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| 319 | }
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| 320 | $new_text .= "</$shortname>";
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| 321 | }
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| 322 |
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| 323 | # filter the text
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| 324 | $new_text = $self->filter_text ($field, $new_text);
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| 325 |
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| 326 | $self->{'num_processed_bytes'} += length ($new_text);
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| 327 | $text .= "$new_text";
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| 328 | } # foreach field
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| 329 |
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| 330 | $text .= "$sectionendtag";
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| 331 | $section = $doc_obj->get_next_section($section);
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| 332 | } # while defined section
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| 333 | print $handle "$text\n$documentendtag";
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| 334 |
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| 335 | }
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| 336 |
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| 337 | #chooses the first two letters or digits for the shortname
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| 338 | #now ignores non-letdig characters
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| 339 | sub create_shortname {
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| 340 | my $self = shift(@_);
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| 341 |
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| 342 | my ($realname) = @_;
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| 343 | #take the first two chars
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| 344 | my $shortname;
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| 345 | if ($realname =~ /^[^\w]*(\w)[^\w]*(\w)/) {
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| 346 | $shortname = "$1$2";
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| 347 | } else {
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| 348 | # there aren't two letdig's in the field - try arbitrary combinations
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| 349 | $realname = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
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| 350 | $shortname = "AB";
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| 351 | }
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| 352 | $shortname =~ tr/a-z/A-Z/;
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| 353 |
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| 354 | #if already used, take the first and third letdigs and so on
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| 355 | my $count = 1;
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| 356 | while (defined $self->{'indexfieldmap'}->{$shortname}) {
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| 357 | if ($realname =~ /^[^\w]*(\w)([^\w]*\w){$count}[^\w]*(\w)/) {
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| 358 | $shortname = "$1$3";
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| 359 | $count++;
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| 360 | $shortname =~ tr/a-z/A-Z/;
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| 361 |
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| 362 | }
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| 363 | else {
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| 364 | #remove up to and incl the first letdig
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| 365 | $realname =~ s/^[^\w]*\w//;
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| 366 | $count = 0;
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| 367 | }
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| 368 | }
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| 369 |
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| 370 | return $shortname;
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| 371 | }
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| 372 |
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| 373 | 1;
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| 374 |
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