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