[29665] | 1 | #!/usr/bin/env perl
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| 2 |
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| 3 | use strict;
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| 4 | use warnings;
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| 5 | use utf8;
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| 6 |
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| 7 | use XML::Parser;
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| 8 | use Data::Dumper;
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| 9 |
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| 10 | # Reads the servlets partial XML file using XML::Parser,
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| 11 | # Then converts the obtained data structure to a more readable one
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| 12 | # Example conversion:
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| 13 | =xml
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| 14 | <servlet>
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| 15 | <servlet-name>library</servlet-name>
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| 16 | <description attribute="example">The standard gsdl3 library program</description>
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| 17 | <servlet-class>org.greenstone.gsdl3.LibraryServlet</servlet-class>
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| 18 | <init-param>
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| 19 | <param-name>library_name</param-name>
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| 20 | <param-value>library</param-value>
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| 21 | </init-param>
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| 22 | <init-param>
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| 23 | <param-name>site_name</param-name>
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| 24 | <param-value>localsite</param-value>
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| 25 | </init-param>
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| 26 | </servlet>
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| 27 | =cut
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| 28 | =data_structure
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| 29 | {
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| 30 | 'servlet' => {
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| 31 | 'servlet-class' => 'org.greenstone.gsdl3.LibraryServlet',
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| 32 | 'servlet-name' => 'library',
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| 33 | 'description' => {
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| 34 | '.value' => 'The standard gsdl3 library program',
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| 35 | '.attr' => {
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| 36 | 'attribute' => 'example'
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| 37 | }
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| 38 | },
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| 39 | 'init-param' => [
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| 40 | {
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| 41 | 'param-value' => 'library',
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| 42 | 'param-name' => 'library_name'
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| 43 | },
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| 44 | {
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| 45 | 'param-name' => 'site_name',
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| 46 | 'param-value' => 'localsite'
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| 47 | }
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| 48 | ]
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| 49 | }
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| 50 | }
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| 51 | =cut
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| 52 | sub read_servlets {
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| 53 | my $file = shift;
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| 54 | # The xml needs a root element, so we wrap it in one
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| 55 | my $xml='
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| 56 | <!DOCTYPE doc [<!ENTITY real_doc SYSTEM "' . $file . '">] >
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| 57 | <__root__>
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| 58 | &real_doc;
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| 59 | </__root__>
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| 60 | ';
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| 61 | # Parse the data using XML::Parser
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| 62 | my $data = new XML::Parser (Style => 'Tree')->parse ($xml);
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| 63 |
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| 64 | sub tidy {
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| 65 | my %hash;
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| 66 | # If the element has attributes, add them to the hash
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| 67 | my $attr = shift;
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| 68 | if (scalar keys %$attr > 0) {
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| 69 | $hash{'.attr'} = $attr;
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| 70 | }
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| 71 | # Read any child elements or text value
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| 72 | while (@_) {
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| 73 | my $element = shift;
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| 74 | my $value = shift;
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| 75 | if ($element eq 0) {
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| 76 | $value =~ /^\s*$/ || ($hash{'.value'} .= $value);
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| 77 | } else {
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| 78 | # If there is more than one of a single tupe of child element,
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| 79 | # That child element must become an array
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| 80 | if (defined $hash{$element}) {
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| 81 | unless (ref $hash{$element} eq 'ARRAY') {
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| 82 | $hash{$element} = [ $hash{$element} ];
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| 83 | }
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| 84 | push @{$hash{$element}}, tidy (@{$value});
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| 85 | } else {
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| 86 | $hash{$element} = tidy (@{$value});
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| 87 | }
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| 88 | }
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| 89 | }
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| 90 | # If the element only has a value, it can become a scalar
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| 91 | if (scalar keys %hash == 1 and defined $hash{'.value'}) {
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| 92 | return $hash{'.value'};
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| 93 | }
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| 94 | return \%hash;
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| 95 | }
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| 96 | return tidy (@{@$data[1]});
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| 97 | }
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| 98 |
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| 99 | # Writes a data structure to an XML file
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| 100 | sub write_servlets {
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| 101 | my ($hash, $file) = @_;
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| 102 | open OUT, '>', $file;
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| 103 | sub open_tag {
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| 104 | my ($indent, $tag, $attr) = @_;
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| 105 | print OUT $indent, "<", $tag;
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| 106 | if (defined $attr) {
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| 107 | for my $key (sort keys %$attr) {
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| 108 | print OUT " ", $key, '="', $attr->{$key}, '"';
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| 109 | }
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| 110 | }
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| 111 | print OUT ">";
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| 112 | }
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| 113 | sub write_xml {
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| 114 | my ($indent, $hash) = @_;
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| 115 | for my $key (sort keys %$hash) {
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| 116 | $key eq '.attr' && next;
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| 117 | my $val = $hash->{$key};
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| 118 | $key eq '.value' && do {
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| 119 | print OUT $val, "\n";
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| 120 | next;
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| 121 | };
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| 122 | for (ref $val) {
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| 123 | /^ARRAY$/ && do {
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| 124 | for my $element (@$val) {
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| 125 | open_tag ($indent, $key, $element->{'.attr'});
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| 126 | for (ref $element) {
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| 127 | /^HASH$/ && do {
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| 128 | print OUT "\n";
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| 129 | write_xml (" $indent", $element);
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| 130 | print OUT $indent, "</", $key, ">\n";
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| 131 | last;
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| 132 | };
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| 133 | print OUT $element, "</", $key, ">\n";
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| 134 | }
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| 135 | }
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| 136 | last;
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| 137 | };
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| 138 | /^HASH$/ && do {
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| 139 | open_tag ($indent, $key, $val->{'.attr'});
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| 140 | # If the element only has a value with attributes,
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| 141 | # it can be formatted on one line
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| 142 | if (scalar keys %$val == 2 and defined $val->{'.value'}) {
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| 143 | print OUT $val->{'.value'}, "</", $key, ">\n";
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| 144 | } else {
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| 145 | print OUT "\n";
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| 146 | write_xml (" $indent", $val);
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| 147 | print OUT $indent, "</", $key, ">\n";
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| 148 | }
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| 149 | last;
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| 150 | };
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| 151 | open_tag ($indent, $key);
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| 152 | print OUT $val;
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| 153 | print OUT "</", $key, ">\n";
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| 154 | }
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| 155 | }
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| 156 | }
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| 157 | write_xml ("", $hash);
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| 158 | close OUT;
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| 159 | }
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| 160 |
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| 161 | my $hash;
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| 162 | # Hackish non-interactive CLI parser
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| 163 | while (@ARGV) {
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| 164 | for (shift) {
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| 165 | /^read$/i && do {
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| 166 | $hash = read_servlets (shift);
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| 167 | last;
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| 168 | };
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| 169 | /^write$/i && do {
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| 170 | write_servlets ($hash, shift);
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| 171 | last;
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| 172 | };
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| 173 | /^debug$/i && do {
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| 174 | print Dumper $hash;
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| 175 | last;
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| 176 | };
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| 177 | /^count$/i && do {
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| 178 | print "Found ", scalar @{$hash->{servlet}}, " servlets\n";
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| 179 | last;
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| 180 | };
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| 181 | /^list$/i && do {
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| 182 | print "Servlets:\n";
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| 183 | for my $servlet (@{$hash->{servlet}}) {
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| 184 | print " ", $servlet->{'servlet-name'}, "\n";
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| 185 | }
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| 186 | last;
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| 187 | };
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| 188 | }
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| 189 | }
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