1 | package XML::Tidy;
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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 | use XML::Parser;
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7 | use base 'Exporter';
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8 |
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9 | our $VERSION = 1.00;
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10 | our @EXPORT = ( 'read_xml', 'write_xml' );
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11 |
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12 | # Reads the servlets partial XML file using XML::Parser,
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13 | # Then converts the obtained data structure to a more readable one
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14 | # Example conversion:
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15 | =xml
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16 | <servlet>
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17 | <servlet-name>library</servlet-name>
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18 | <description attribute="example">The standard gsdl3 library program</description>
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19 | <servlet-class>org.greenstone.gsdl3.LibraryServlet</servlet-class>
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20 | <init-param>
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21 | <param-name>library_name</param-name>
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22 | <param-value>library</param-value>
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23 | </init-param>
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24 | <init-param>
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25 | <param-name>site_name</param-name>
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26 | <param-value>localsite</param-value>
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27 | </init-param>
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28 | </servlet>
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29 | =cut
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30 | =data_structure
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31 | {
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32 | 'servlet' => {
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33 | 'servlet-class' => 'org.greenstone.gsdl3.LibraryServlet',
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34 | 'servlet-name' => 'library',
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35 | 'description' => {
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36 | '.value' => 'The standard gsdl3 library program',
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37 | '.attr' => {
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38 | 'attribute' => 'example'
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39 | }
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40 | },
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41 | 'init-param' => [
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42 | {
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43 | 'param-value' => 'library',
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44 | 'param-name' => 'library_name'
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45 | },
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46 | {
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47 | 'param-name' => 'site_name',
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48 | 'param-value' => 'localsite'
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49 | }
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50 | ]
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51 | }
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52 | }
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53 | =cut
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54 | sub read_xml {
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55 | my $FH = shift;
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56 | local $/ = undef;
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57 | my $xml = <$FH>;
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58 | # The xml needs a root element, so we wrap it in one
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59 | $xml='<__root__>' . $xml . '</__root__>';
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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_xml {
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100 | my ($hash, $FH) = @_;
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101 | select $FH;
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102 | sub open_tag {
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103 | my ($indent, $tag, $attr) = @_;
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104 | print $indent, "<", $tag;
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105 | if (defined $attr) {
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106 | for my $key (sort keys %$attr) {
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107 | print " ", $key, '="', $attr->{$key}, '"';
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108 | }
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109 | }
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110 | print ">";
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111 | }
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112 | sub write_element {
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113 | my ($indent, $hash) = @_;
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114 | for my $key (sort keys %$hash) {
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115 | $key eq '.attr' && next;
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116 | my $val = $hash->{$key};
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117 | $key eq '.value' && do {
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118 | print $val, "\n";
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119 | next;
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120 | };
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121 | for (ref $val) {
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122 | /^ARRAY$/ && do {
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123 | for my $element (@$val) {
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124 | open_tag ($indent, $key, $element->{'.attr'});
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125 | for (ref $element) {
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126 | /^HASH$/ && do {
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127 | print "\n";
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128 | write_element (" $indent", $element);
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129 | print $indent, "</", $key, ">\n";
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130 | last;
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131 | };
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132 | print $element, "</", $key, ">\n";
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133 | }
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134 | }
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135 | last;
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136 | };
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137 | /^HASH$/ && do {
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138 | open_tag ($indent, $key, $val->{'.attr'});
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139 | # If the element only has a value with attributes,
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140 | # it can be formatted on one line
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141 | if (scalar keys %$val == 2 and defined $val->{'.value'}) {
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142 | print $val->{'.value'}, "</", $key, ">\n";
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143 | } else {
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144 | print "\n";
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145 | write_element (" $indent", $val);
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146 | print $indent, "</", $key, ">\n";
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147 | }
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148 | last;
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149 | };
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150 | open_tag ($indent, $key);
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151 | print $val;
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152 | print "</", $key, ">\n";
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153 | }
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154 | }
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155 | }
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156 | write_element ("", $hash);
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157 | select STDOUT;
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158 | }
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