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='<!DOCTYPE doc [<!ENTITY real_doc SYSTEM "' . $file . '">] >
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56 | <__root__>
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57 | &real_doc;
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58 | </__root__>
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59 | ';
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60 | # Parse the data using XML::Parser
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61 | my $data = new XML::Parser (Style => 'Tree')->parse ($xml);
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62 |
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63 | sub tidy {
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64 | my %hash;
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65 | # If the element has attributes, add them to the hash
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66 | my $attr = shift;
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67 | if (scalar keys %$attr > 0) {
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68 | $hash{'.attr'} = $attr;
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69 | }
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70 | # Read any child elements or text value
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71 | while (@_) {
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72 | my $element = shift;
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73 | my $value = shift;
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74 | if ($element eq 0) {
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75 | $value =~ /^\s*$/ || ($hash{'.value'} .= $value);
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76 | } else {
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77 | # If there is more than one of a single tupe of child element,
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78 | # That child element must become an array
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79 | if (defined $hash{$element}) {
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80 | unless (ref $hash{$element} eq 'ARRAY') {
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81 | $hash{$element} = [ $hash{$element} ];
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82 | }
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83 | push @{$hash{$element}}, tidy (@{$value});
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84 | } else {
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85 | $hash{$element} = tidy (@{$value});
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86 | }
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87 | }
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88 | }
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89 | # If the element only has a value, it can become a scalar
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90 | if (scalar keys %hash == 1 and defined $hash{'.value'}) {
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91 | return $hash{'.value'};
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92 | }
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93 | return \%hash;
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94 | }
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95 | return tidy (@{@$data[1]});
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96 | }
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97 |
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98 | # Writes a data structure to an XML file
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99 | sub write_servlets {
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100 | my ($hash, $file) = @_;
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101 | my $OUT;
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102 | if ($file ne '-') {
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103 | open $OUT, '>', $file;
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104 | select $OUT;
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105 | }
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106 | sub open_tag {
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107 | my ($indent, $tag, $attr) = @_;
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108 | print $indent, "<", $tag;
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109 | if (defined $attr) {
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110 | for my $key (sort keys %$attr) {
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111 | print " ", $key, '="', $attr->{$key}, '"';
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112 | }
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113 | }
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114 | print ">";
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115 | }
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116 | sub write_xml {
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117 | my ($indent, $hash) = @_;
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118 | for my $key (sort keys %$hash) {
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119 | $key eq '.attr' && next;
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120 | my $val = $hash->{$key};
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121 | $key eq '.value' && do {
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122 | print $val, "\n";
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123 | next;
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124 | };
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125 | for (ref $val) {
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126 | /^ARRAY$/ && do {
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127 | for my $element (@$val) {
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128 | open_tag ($indent, $key, $element->{'.attr'});
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129 | for (ref $element) {
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130 | /^HASH$/ && do {
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131 | print "\n";
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132 | write_xml (" $indent", $element);
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133 | print $indent, "</", $key, ">\n";
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134 | last;
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135 | };
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136 | print $element, "</", $key, ">\n";
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137 | }
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138 | }
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139 | last;
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140 | };
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141 | /^HASH$/ && do {
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142 | open_tag ($indent, $key, $val->{'.attr'});
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143 | # If the element only has a value with attributes,
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144 | # it can be formatted on one line
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145 | if (scalar keys %$val == 2 and defined $val->{'.value'}) {
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146 | print $val->{'.value'}, "</", $key, ">\n";
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147 | } else {
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148 | print "\n";
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149 | write_xml (" $indent", $val);
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150 | print $indent, "</", $key, ">\n";
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151 | }
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152 | last;
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153 | };
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154 | open_tag ($indent, $key);
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155 | print $val;
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156 | print "</", $key, ">\n";
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157 | }
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158 | }
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159 | }
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160 | write_xml ("", $hash);
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161 | if (defined $OUT) {
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162 | close $OUT;
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163 | }
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164 | select STDOUT;
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165 | }
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166 | # The code above is for generic XML read/writing
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167 | # The code below is specific to Greenstone's servlets.xml
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168 |
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169 | my $hash;
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170 | # Hackish non-interactive CLI parser
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171 | while (@ARGV) {
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172 | for (shift) {
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173 | /^read$/i && do {
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174 | $hash = read_servlets (shift);
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175 | last;
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176 | };
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177 | /^write$/i && do {
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178 | write_servlets ($hash, shift);
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179 | last;
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180 | };
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181 | /^debug$/i && do {
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182 | print Dumper $hash;
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183 | last;
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184 | };
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185 | /^count$/i && do {
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186 | my $servlets = $hash->{servlet};
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187 | my $count = 1;
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188 | if (ref $servlets eq 'ARRAY') {
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189 | $count = scalar @{$hash->{servlet}};
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190 | }
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191 | print "Found ", $count, " servlets\n";
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192 | last;
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193 | };
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194 | /^list$/i && do {
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195 | print "Servlets:\n";
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196 | my $servlets = $hash->{servlet};
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197 | if (ref $servlets eq 'ARRAY') {
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198 | for my $servlet (@{$hash->{servlet}}) {
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199 | print " ", $servlet->{'servlet-name'}, "\n";
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200 | }
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201 | } else {
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202 | print " ", $servlets->{'servlet-name'}, "\n";
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203 | }
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204 | last;
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205 | };
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206 | }
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207 | }
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