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 | #$%^
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31 | use parse2;
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32 |
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33 | sub BEGIN {
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34 | @XMLPlug::ISA = ('BasPlug');
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35 | unshift (@INC, "$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 | my $parser = new XML::Parser('Style' => 'Stream',
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72 | 'Handlers' => {'Char' => \&Char,
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73 | 'XMLDecl' => \&XMLDecl,
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74 | 'Entity' => \&Entity,
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75 | 'Doctype' => \&Doctype,
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76 | 'Default' => \&Default
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77 | });
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78 | $self->{'parser'} = $parser;
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79 |
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80 | return bless $self, $class;
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81 | }
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82 |
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83 | sub apply_xslt
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84 | {
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85 | my $self = shift @_;
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86 | my ($xslt,$filename) = @_;
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87 |
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88 | my $outhandle = $self->{'outhandle'};
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89 |
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90 | my $xslt_filename = $xslt;
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91 |
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92 | if (! -e $xslt_filename) {
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93 | # Look in main site directory
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94 | my $gsdlhome = $ENV{'GSDLHOME'};
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95 | $xslt_filename = &util::filename_cat($gsdlhome,$xslt);
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96 | }
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97 |
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98 | if (! -e $xslt_filename) {
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99 | # Look in collection directory
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100 | my $coldir = $ENV{'COLLECTDIR'};
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101 | $xslt_filename = &util::filename_cat($coldir,$xslt);
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102 | }
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103 |
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104 | if (! -e $xslt_filename) {
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105 | print $outhandle "Warning: Unable to find XSLT $xslt\n";
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106 | if (open(XMLIN,"<$filename")) {
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107 |
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108 | $untransformed_xml = "";
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109 | while (defined (my $line = <XMLIN>)) {
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110 |
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111 | $untransformed_xml .= $line;
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112 | }
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113 | close(XMLIN);
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114 |
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115 | return $untransformed_xml;
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116 | }
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117 | else {
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118 | print $outhandle "Error: Unable to open file $filename\n";
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119 | print $outhandle " $!\n";
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120 | return "";
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121 | }
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122 |
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123 | }
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124 |
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125 | my $bin_java = &util::filename_cat($ENV{'GSDLHOME'},"bin","java");
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126 | my $jar_filename = &util::filename_cat($bin_java,"xalan.jar");
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127 | my $xslt_base_cmd = "java -jar $jar_filename";
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128 | my $xslt_cmd = "$xslt_base_cmd -IN \"$filename\" -XSL \"$xslt_filename\"";
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129 |
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130 | my $transformed_xml = "";
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131 |
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132 | if (open(XSLT_IN,"$xslt_cmd |")) {
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133 | while (defined (my $line = <XSLT_IN>)) {
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134 |
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135 | $transformed_xml .= $line;
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136 | }
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137 | close(XSLT_IN);
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138 | }
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139 | else {
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140 | print $outhandle "Error: Unable to run command $xsl_cmd\n";
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141 | print $outhandle " $!\n";
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142 | }
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143 |
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144 | return $transformed_xml;
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145 |
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146 | }
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147 |
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148 |
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149 | sub read {
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150 | # $self must be global to work with XML callback routines.
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151 | $self = shift (@_);
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152 |
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153 | my ($pluginfo, $base_dir, $file, $metadata, $processor, $maxdocs, $total_count, $gli) = @_;
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154 |
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155 | my $filename = $file;
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156 | $filename = &util::filename_cat ($base_dir, $file) if $base_dir =~ /\w/;
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157 |
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158 | if ($self->{'block_exp'} ne "" && $filename =~ /$self->{'block_exp'}/) {
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159 | $self->{'num_blocked'} ++;
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160 | return 0;
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161 | }
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162 | if ($filename !~ /$self->{'process_exp'}/ || !-f $filename) {
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163 | return undef;
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164 | }
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165 |
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166 | $file =~ s/^[\/\\]+//; # $file often begins with / so we'll tidy it up
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167 | $self->{'file'} = $file;
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168 | $self->{'filename'} = $filename;
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169 | $self->{'processor'} = $processor;
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170 | $self->{'metadata'} = $metadata;
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171 | $self->{'gli'} = $gli;
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172 |
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173 | eval {
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174 | my $xslt = $self->{'xslt'};
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175 | if (defined $xslt && ($xslt ne "")) {
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176 | # perform xslt
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177 | my $transformed_xml = $self->apply_xslt($xslt,$filename);
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178 |
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179 | # feed transformed file (now in memory as string) into XML parser
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180 | $self->{'parser'}->parse($transformed_xml);
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181 | }
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182 | else {
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183 | $self->{'parser'}->parsefile($filename);
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184 | }
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185 | };
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186 |
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187 | if ($@) {
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188 |
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189 | # parsefile may either croak somewhere in XML::Parser (e.g. because
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190 | # the document is not well formed) or die somewhere in XMLPlug or a
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191 | # derived plugin (e.g. because we're attempting to process a
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192 | # document whose DOCTYPE is not meant for this plugin). For the
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193 | # first case we'll print a warning and continue, for the second
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194 | # we'll just continue quietly
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195 |
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196 | print STDERR "**** Error is: $@\n";
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197 |
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198 | my ($msg) = $@ =~ /Carp::croak\(\'(.*?)\'\)/;
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199 | if (defined $msg) {
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200 | my $outhandle = $self->{'outhandle'};
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201 | my $plugin_name = ref ($self);
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202 | print $outhandle "$plugin_name failed to process $file ($msg)\n";
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203 | }
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204 |
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205 | # reset ourself for the next document
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206 | $self->{'section_level'}=0;
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207 | print STDERR "<ProcessingError n='$file'>\n" if ($gli);
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208 | return -1; # error during processing
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209 | }
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210 |
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211 | return 1; # processed the file
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212 | }
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213 |
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214 | # the following two methods are for if you want to do the parsing from a
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215 | # plugin that inherits from this. it seems that you can't call the parse
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216 | # methods directly. WHY???
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217 | sub parse_file {
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218 | $self = shift (@_);
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219 | my ($filename) = @_;
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220 | $self->{'parser'}->parsefile($filename);
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221 | }
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222 |
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223 | sub parse_string {
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224 | $self = shift (@_);
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225 | my ($xml_string) = @_;
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226 | $self->{'parser'}->parse($xml_string);
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227 | }
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228 |
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229 | sub get_default_process_exp {
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230 | my $self = shift (@_);
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231 |
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232 | return q^(?i)\.xml$^;
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233 | }
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234 |
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235 | sub StartDocument {$self->xml_start_document(@_);}
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236 | sub XMLDecl {$self->xml_xmldecl(@_);}
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237 | sub Entity {$self->xml_entity(@_);}
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238 | sub Doctype {$self->xml_doctype(@_);}
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239 | sub StartTag {$self->xml_start_tag(@_);}
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240 | sub EndTag {$self->xml_end_tag(@_);}
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241 | sub Text {$self->xml_text(@_);}
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242 | sub PI {$self->xml_pi(@_);}
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243 | sub EndDocument {$self->xml_end_document(@_);}
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244 | sub Default {$self->xml_default(@_);}
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245 |
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246 | # This Char function overrides the one in XML::Parser::Stream to overcome a
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247 | # problem where $expat->{Text} is treated as the return value, slowing
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248 | # things down significantly in some cases.
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249 | sub Char {
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250 | use bytes; # Necessary to prevent encoding issues with XML::Parser 2.31+
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251 | $_[0]->{'Text'} .= $_[1];
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252 | return undef;
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253 | }
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254 |
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255 | # Called at the beginning of the XML document.
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256 | sub xml_start_document {
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257 | my $self = shift(@_);
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258 | my ($expat) = @_;
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259 |
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260 | $self->open_document();
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261 | }
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262 |
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263 | # Called for XML declarations
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264 | sub xml_xmldecl {
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265 | my $self = shift(@_);
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266 | my ($expat, $version, $encoding, $standalone) = @_;
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267 | }
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268 |
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269 | # Called for XML entities
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270 | sub xml_entity {
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271 | my $self = shift(@_);
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272 | my ($expat, $name, $val, $sysid, $pubid, $ndata) = @_;
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273 | }
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274 |
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275 | # Called for DOCTYPE declarations - use die to bail out if this doctype
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276 | # is not meant for this plugin
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277 | sub xml_doctype {
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278 | my $self = shift(@_);
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279 | my ($expat, $name, $sysid, $pubid, $internal) = @_;
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280 | die "XMLPlug Cannot process XML document with DOCTYPE of $name";
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281 | }
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282 |
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283 | # Called for every start tag. The $_ variable will contain a copy of the
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284 | # tag and the %_ variable will contain the element's attributes.
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285 | sub xml_start_tag {
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286 | my $self = shift(@_);
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287 | my ($expat, $element) = @_;
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288 | }
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289 |
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290 | # Called for every end tag. The $_ variable will contain a copy of the tag.
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291 | sub xml_end_tag {
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292 | my $self = shift(@_);
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293 | my ($expat, $element) = @_;
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294 | }
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295 |
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296 | # Called just before start or end tags with accumulated non-markup text in
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297 | # the $_ variable.
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298 | sub xml_text {
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299 | my $self = shift(@_);
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300 | my ($expat) = @_;
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301 | }
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302 |
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303 | # Called for processing instructions. The $_ variable will contain a copy
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304 | # of the pi.
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305 | sub xml_pi {
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306 | my $self = shift(@_);
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307 | my ($expat, $target, $data) = @_;
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308 | }
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309 |
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310 | # Called at the end of the XML document.
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311 | sub xml_end_document {
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312 | my $self = shift(@_);
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313 | my ($expat) = @_;
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314 |
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315 | $self->close_document();
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316 | }
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317 |
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318 | # Called for any characters not handled by the above functions.
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319 | sub xml_default {
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320 | my $self = shift(@_);
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321 | my ($expat, $text) = @_;
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322 | }
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323 |
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324 | sub open_document {
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325 | my $self = shift(@_);
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326 |
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327 | # create a new document
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328 | $self->{'doc_obj'} = new doc ($self->{'filename'}, "indexed_doc");
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329 | $self->{'doc_obj'}->set_OIDtype ($self->{'processor'}->{'OIDtype'});
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330 | }
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331 |
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332 | sub close_document {
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333 | my $self = shift(@_);
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334 | my $doc_obj = $self->{'doc_obj'};
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335 | # include any metadata passed in from previous plugins
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336 | # note that this metadata is associated with the top level section
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337 | $self->extra_metadata ($doc_obj,
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338 | $doc_obj->get_top_section(),
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339 | $self->{'metadata'});
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340 |
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341 | # do any automatic metadata extraction
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342 | $self->auto_extract_metadata ($doc_obj);
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343 |
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344 | # add an OID
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345 | $doc_obj->set_OID();
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346 |
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347 | $doc_obj->add_utf8_metadata($doc_obj->get_top_section(), "Plugin", "$self->{'plugin_type'}");
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348 | $doc_obj->add_metadata($doc_obj->get_top_section(), "FileFormat", "XML");
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349 |
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350 | # process the document
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351 | $self->{'processor'}->process($doc_obj);
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352 |
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353 | $self->{'num_processed'} ++;
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354 | }
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355 |
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356 | 1;
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357 |
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358 |
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359 |
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360 |
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