1 | ###########################################################################
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2 | #
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3 | # XMLPlug.pm -- base class for XML plugins
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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) 2001 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 | package XMLPlug;
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27 |
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28 | use BasPlug;
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29 | use doc;
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30 | use strict;
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31 | no strict 'refs'; # allow filehandles to be variables and viceversa
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32 |
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33 | sub BEGIN {
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34 | @XMLPlug::ISA = ('BasPlug');
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35 | unshift (@INC, "$ENV{'GSDLHOME'}/perllib/cpan");
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36 | }
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37 |
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38 | use XMLParser;
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39 |
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40 | my $arguments =
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41 | [ { 'name' => "process_exp",
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42 | 'desc' => "{BasPlug.process_exp}",
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43 | 'type' => "regexp",
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44 | 'deft' => &get_default_process_exp(),
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45 | 'reqd' => "no" },
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46 | { 'name' => "xslt",
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47 | 'desc' => "{XMLPlug.xslt}",
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48 | 'type' => "string",
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49 | 'deft' => "",
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50 | 'reqd' => "no" } ];
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51 |
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52 | my $options = { 'name' => "XMLPlug",
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53 | 'desc' => "{XMLPlug.desc}",
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54 | 'abstract' => "yes",
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55 | 'inherits' => "yes",
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56 | 'args' => $arguments };
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57 |
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58 |
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59 | our ($self);
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60 | sub new {
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61 | my ($class) = shift (@_);
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62 | my ($pluginlist,$inputargs,$hashArgOptLists) = @_;
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63 | push(@$pluginlist, $class);
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64 |
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65 | if(defined $arguments){ push(@{$hashArgOptLists->{"ArgList"}},@{$arguments});}
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66 | if(defined $options) { push(@{$hashArgOptLists->{"OptList"}},$options)};
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67 |
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68 | # $self is global for use within subroutines called by XML::Parser
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69 | $self = (defined $hashArgOptLists)? new BasPlug($pluginlist,$inputargs,$hashArgOptLists): new BasPlug($pluginlist,$inputargs);
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70 |
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71 | if ($self->{'info_only'}) {
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72 | # don't worry about any options etc
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73 | return bless $self, $class;
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74 | }
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75 |
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76 | my $parser = new XML::Parser('Style' => 'Stream',
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77 | 'Handlers' => {'Char' => \&Char,
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78 | 'XMLDecl' => \&XMLDecl,
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79 | 'Entity' => \&Entity,
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80 | 'Doctype' => \&Doctype,
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81 | 'Default' => \&Default
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82 | });
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83 | $self->{'parser'} = $parser;
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84 |
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85 | return bless $self, $class;
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86 | }
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87 |
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88 | sub apply_xslt
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89 | {
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90 | my $self = shift @_;
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91 | my ($xslt,$filename) = @_;
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92 |
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93 | my $outhandle = $self->{'outhandle'};
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94 |
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95 | my $xslt_filename = $xslt;
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96 |
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97 | if (! -e $xslt_filename) {
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98 | # Look in main site directory
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99 | my $gsdlhome = $ENV{'GSDLHOME'};
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100 | $xslt_filename = &util::filename_cat($gsdlhome,$xslt);
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101 | }
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102 |
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103 | if (! -e $xslt_filename) {
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104 | # Look in collection directory
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105 | my $coldir = $ENV{'COLLECTDIR'};
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106 | $xslt_filename = &util::filename_cat($coldir,$xslt);
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107 | }
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108 |
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109 | if (! -e $xslt_filename) {
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110 | print $outhandle "Warning: Unable to find XSLT $xslt\n";
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111 | if (open(XMLIN,"<$filename")) {
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112 |
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113 | my $untransformed_xml = "";
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114 | while (defined (my $line = <XMLIN>)) {
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115 |
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116 | $untransformed_xml .= $line;
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117 | }
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118 | close(XMLIN);
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119 |
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120 | return $untransformed_xml;
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121 | }
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122 | else {
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123 | print $outhandle "Error: Unable to open file $filename\n";
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124 | print $outhandle " $!\n";
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125 | return "";
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126 | }
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127 |
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128 | }
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129 |
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130 | my $bin_java = &util::filename_cat($ENV{'GSDLHOME'},"bin","java");
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131 | my $jar_filename = &util::filename_cat($bin_java,"xalan.jar");
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132 | my $xslt_base_cmd = "java -jar $jar_filename";
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133 | my $xslt_cmd = "$xslt_base_cmd -IN \"$filename\" -XSL \"$xslt_filename\"";
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134 |
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135 | my $transformed_xml = "";
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136 |
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137 | if (open(XSLT_IN,"$xslt_cmd |")) {
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138 | while (defined (my $line = <XSLT_IN>)) {
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139 |
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140 | $transformed_xml .= $line;
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141 | }
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142 | close(XSLT_IN);
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143 | }
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144 | else {
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145 | print $outhandle "Error: Unable to run command $xslt_cmd\n";
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146 | print $outhandle " $!\n";
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147 | }
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148 |
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149 | return $transformed_xml;
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150 |
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151 | }
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152 |
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153 |
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154 | sub read {
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155 | # $self must be global to work with XML callback routines.
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156 | $self = shift (@_);
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157 |
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158 | my ($pluginfo, $base_dir, $file, $metadata, $processor, $maxdocs, $total_count, $gli) = @_;
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159 |
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160 | # Make sure we're processing the correct file, do blocking etc
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161 | my ($block_status,$filename) = $self->read_block(@_);
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162 | return $block_status if ((!defined $block_status) || ($block_status==0));
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163 |
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164 | $file =~ s/^[\/\\]+//; # $file often begins with / so we'll tidy it up
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165 | $self->{'file'} = $file;
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166 | $self->{'filename'} = $filename;
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167 | $self->{'processor'} = $processor;
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168 | $self->{'metadata'} = $metadata;
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169 | $self->{'gli'} = $gli;
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170 |
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171 | eval {
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172 | my $xslt = $self->{'xslt'};
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173 | if (defined $xslt && ($xslt ne "")) {
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174 | # perform xslt
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175 | my $transformed_xml = $self->apply_xslt($xslt,$filename);
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176 |
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177 | # feed transformed file (now in memory as string) into XML parser
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178 | $self->{'parser'}->parse($transformed_xml);
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179 | }
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180 | else {
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181 | $self->{'parser'}->parsefile($filename);
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182 | }
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183 | };
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184 |
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185 | if ($@) {
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186 |
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187 | # parsefile may either croak somewhere in XML::Parser (e.g. because
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188 | # the document is not well formed) or die somewhere in XMLPlug or a
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189 | # derived plugin (e.g. because we're attempting to process a
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190 | # document whose DOCTYPE is not meant for this plugin). For the
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191 | # first case we'll print a warning and continue, for the second
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192 | # we'll just continue quietly
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193 |
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194 | print STDERR "**** Error is: $@\n";
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195 |
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196 | my ($msg) = $@ =~ /Carp::croak\(\'(.*?)\'\)/;
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197 | if (defined $msg) {
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198 | my $outhandle = $self->{'outhandle'};
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199 | my $plugin_name = ref ($self);
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200 | print $outhandle "$plugin_name failed to process $file ($msg)\n";
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201 | }
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202 |
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203 | # reset ourself for the next document
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204 | $self->{'section_level'}=0;
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205 | print STDERR "<ProcessingError n='$file'>\n" if ($gli);
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206 | return -1; # error during processing
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207 | }
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208 |
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209 | return 1; # processed the file
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210 | }
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211 |
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212 | # the following two methods are for if you want to do the parsing from a
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213 | # plugin that inherits from this. it seems that you can't call the parse
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214 | # methods directly. WHY???
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215 | sub parse_file {
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216 | $self = shift (@_);
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217 | my ($filename) = @_;
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218 | $self->{'parser'}->parsefile($filename);
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219 | }
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220 |
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221 | sub parse_string {
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222 | $self = shift (@_);
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223 | my ($xml_string) = @_;
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224 | $self->{'parser'}->parse($xml_string);
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225 | }
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226 |
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227 | sub get_default_process_exp {
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228 | my $self = shift (@_);
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229 |
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230 | return q^(?i)\.xml$^;
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231 | }
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232 |
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233 | sub StartDocument {$self->xml_start_document(@_);}
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234 | sub XMLDecl {$self->xml_xmldecl(@_);}
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235 | sub Entity {$self->xml_entity(@_);}
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236 | sub Doctype {$self->xml_doctype(@_);}
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237 | sub StartTag {$self->xml_start_tag(@_);}
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238 | sub EndTag {$self->xml_end_tag(@_);}
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239 | sub Text {$self->xml_text(@_);}
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240 | sub PI {$self->xml_pi(@_);}
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241 | sub EndDocument {$self->xml_end_document(@_);}
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242 | sub Default {$self->xml_default(@_);}
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243 |
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244 | # This Char function overrides the one in XML::Parser::Stream to overcome a
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245 | # problem where $expat->{Text} is treated as the return value, slowing
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246 | # things down significantly in some cases.
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247 | sub Char {
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248 | use bytes; # Necessary to prevent encoding issues with XML::Parser 2.31+
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249 | $_[0]->{'Text'} .= $_[1];
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250 | return undef;
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251 | }
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252 |
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253 | # Called at the beginning of the XML document.
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254 | sub xml_start_document {
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255 | my $self = shift(@_);
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256 | my ($expat) = @_;
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257 |
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258 | $self->open_document();
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259 | }
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260 |
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261 | # Called for XML declarations
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262 | sub xml_xmldecl {
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263 | my $self = shift(@_);
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264 | my ($expat, $version, $encoding, $standalone) = @_;
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265 | }
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266 |
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267 | # Called for XML entities
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268 | sub xml_entity {
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269 | my $self = shift(@_);
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270 | my ($expat, $name, $val, $sysid, $pubid, $ndata) = @_;
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271 | }
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272 |
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273 | # Called for DOCTYPE declarations - use die to bail out if this doctype
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274 | # is not meant for this plugin
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275 | sub xml_doctype {
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276 | my $self = shift(@_);
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277 | my ($expat, $name, $sysid, $pubid, $internal) = @_;
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278 | die "XMLPlug Cannot process XML document with DOCTYPE of $name";
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279 | }
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280 |
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281 | # Called for every start tag. The $_ variable will contain a copy of the
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282 | # tag and the %_ variable will contain the element's attributes.
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283 | sub xml_start_tag {
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284 | my $self = shift(@_);
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285 | my ($expat, $element) = @_;
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286 | }
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287 |
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288 | # Called for every end tag. The $_ variable will contain a copy of the tag.
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289 | sub xml_end_tag {
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290 | my $self = shift(@_);
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291 | my ($expat, $element) = @_;
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292 | }
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293 |
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294 | # Called just before start or end tags with accumulated non-markup text in
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295 | # the $_ variable.
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296 | sub xml_text {
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297 | my $self = shift(@_);
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298 | my ($expat) = @_;
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299 | }
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300 |
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301 | # Called for processing instructions. The $_ variable will contain a copy
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302 | # of the pi.
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303 | sub xml_pi {
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304 | my $self = shift(@_);
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305 | my ($expat, $target, $data) = @_;
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306 | }
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307 |
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308 | # Called at the end of the XML document.
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309 | sub xml_end_document {
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310 | my $self = shift(@_);
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311 | my ($expat) = @_;
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312 |
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313 | $self->close_document();
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314 | }
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315 |
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316 | # Called for any characters not handled by the above functions.
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317 | sub xml_default {
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318 | my $self = shift(@_);
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319 | my ($expat, $text) = @_;
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320 | }
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321 |
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322 | sub open_document {
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323 | my $self = shift(@_);
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324 |
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325 | # create a new document
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326 | $self->{'doc_obj'} = new doc ($self->{'filename'}, "indexed_doc");
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327 | $self->{'doc_obj'}->set_OIDtype ($self->{'processor'}->{'OIDtype'});
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328 | }
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329 |
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330 | sub close_document {
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331 | my $self = shift(@_);
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332 | my $doc_obj = $self->{'doc_obj'};
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333 | # include any metadata passed in from previous plugins
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334 | # note that this metadata is associated with the top level section
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335 | $self->extra_metadata ($doc_obj,
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336 | $doc_obj->get_top_section(),
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337 | $self->{'metadata'});
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338 |
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339 | # do any automatic metadata extraction
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340 | $self->auto_extract_metadata ($doc_obj);
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341 |
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342 | # add an OID
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343 | $doc_obj->set_OID();
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344 |
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345 | $doc_obj->add_utf8_metadata($doc_obj->get_top_section(), "Plugin", "$self->{'plugin_type'}");
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346 | $doc_obj->add_metadata($doc_obj->get_top_section(), "FileFormat", "XML");
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347 |
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348 | # process the document
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349 | $self->{'processor'}->process($doc_obj);
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350 |
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351 | $self->{'num_processed'} ++;
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352 | }
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353 |
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354 | 1;
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355 |
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356 |
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357 |
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358 |
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