1 | # $Id: Node.pm 7909 2004-08-06 05:11:55Z mdewsnip $
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2 |
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3 | package XML::XPath::Node;
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4 |
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5 | use strict;
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6 | use vars qw(@ISA @EXPORT $AUTOLOAD %EXPORT_TAGS @EXPORT_OK);
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7 | use Exporter;
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8 | use Carp;
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9 | @ISA = ('Exporter');
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10 |
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11 | sub UNKNOWN_NODE () {0;}
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12 | sub ELEMENT_NODE () {1;}
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13 | sub ATTRIBUTE_NODE () {2;}
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14 | sub TEXT_NODE () {3;}
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15 | sub CDATA_SECTION_NODE () {4;}
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16 | sub ENTITY_REFERENCE_NODE () {5;}
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17 | sub ENTITY_NODE () {6;}
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18 | sub PROCESSING_INSTRUCTION_NODE () {7;}
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19 | sub COMMENT_NODE () {8;}
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20 | sub DOCUMENT_NODE () {9;}
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21 | sub DOCUMENT_TYPE_NODE () {10;}
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22 | sub DOCUMENT_FRAGMENT_NODE () {11;}
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23 | sub NOTATION_NODE () {12;}
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24 |
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25 | # Non core DOM stuff
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26 | sub ELEMENT_DECL_NODE () {13;}
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27 | sub ATT_DEF_NODE () {14;}
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28 | sub XML_DECL_NODE () {15;}
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29 | sub ATTLIST_DECL_NODE () {16;}
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30 | sub NAMESPACE_NODE () {17;}
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31 |
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32 | # per-node constants
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33 |
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34 | # All
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35 | sub node_parent () { 0; }
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36 | sub node_pos () { 1; }
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37 | sub node_global_pos () { 2; }
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38 |
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39 | # Element
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40 | sub node_prefix () { 3; }
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41 | sub node_children () { 4; }
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42 | sub node_name () { 5; }
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43 | sub node_attribs () { 6; }
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44 | sub node_namespaces () { 7; }
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45 | sub node_ids () { 8; }
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46 |
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47 | # Char
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48 | sub node_text () { 3; }
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49 |
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50 | # PI
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51 | sub node_target () { 3; }
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52 | sub node_data () { 4; }
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53 |
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54 | # Comment
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55 | sub node_comment () { 3; }
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56 |
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57 | # Attribute
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58 | # sub node_prefix () { 3; }
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59 | sub node_key () { 4; }
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60 | sub node_value () { 5; }
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61 |
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62 | # Namespaces
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63 | # sub node_prefix () { 3; }
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64 | sub node_expanded () { 4; }
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65 |
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66 | @EXPORT = qw(
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67 | UNKNOWN_NODE
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68 | ELEMENT_NODE
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69 | ATTRIBUTE_NODE
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70 | TEXT_NODE
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71 | CDATA_SECTION_NODE
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72 | ENTITY_REFERENCE_NODE
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73 | ENTITY_NODE
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74 | PROCESSING_INSTRUCTION_NODE
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75 | COMMENT_NODE
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76 | DOCUMENT_NODE
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77 | DOCUMENT_TYPE_NODE
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78 | DOCUMENT_FRAGMENT_NODE
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79 | NOTATION_NODE
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80 | ELEMENT_DECL_NODE
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81 | ATT_DEF_NODE
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82 | XML_DECL_NODE
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83 | ATTLIST_DECL_NODE
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84 | NAMESPACE_NODE
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85 | );
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86 |
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87 | @EXPORT_OK = qw(
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88 | node_parent
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89 | node_pos
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90 | node_global_pos
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91 | node_prefix
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92 | node_children
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93 | node_name
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94 | node_attribs
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95 | node_namespaces
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96 | node_text
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97 | node_target
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98 | node_data
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99 | node_comment
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100 | node_key
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101 | node_value
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102 | node_expanded
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103 | node_ids
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104 | );
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105 |
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106 | %EXPORT_TAGS = (
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107 | 'node_keys' => [
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108 | qw(
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109 | node_parent
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110 | node_pos
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111 | node_global_pos
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112 | node_prefix
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113 | node_children
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114 | node_name
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115 | node_attribs
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116 | node_namespaces
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117 | node_text
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118 | node_target
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119 | node_data
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120 | node_comment
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121 | node_key
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122 | node_value
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123 | node_expanded
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124 | node_ids
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125 | ), @EXPORT,
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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 $global_pos = 0;
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131 |
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132 | sub nextPos {
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133 | my $class = shift;
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134 | return $global_pos += 5;
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135 | }
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136 |
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137 | sub resetPos {
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138 | $global_pos = 0;
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139 | }
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140 |
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141 | my %DecodeDefaultEntity =
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142 | (
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143 | '"' => """,
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144 | ">" => ">",
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145 | "<" => "<",
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146 | "'" => "'",
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147 | "&" => "&"
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148 | );
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149 |
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150 | sub XMLescape {
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151 | my ($str, $default) = @_;
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152 | return undef unless defined $str;
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153 | $default ||= '';
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154 |
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155 | if ($XML::XPath::EncodeUtf8AsEntity) {
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156 | $str =~ s/([\xC0-\xDF].|[\xE0-\xEF]..|[\xF0-\xFF]...)|([$default])|(]]>)/
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157 | defined($1) ? XmlUtf8Decode ($1) :
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158 | defined ($2) ? $DecodeDefaultEntity{$2} : "]]>" /egsx;
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159 | }
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160 | else {
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161 | $str =~ s/([$default])|(]]>)/
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162 | defined ($1) ? $DecodeDefaultEntity{$1} : ']]>' /gsex;
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163 | }
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164 |
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165 | #?? could there be references that should not be expanded?
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166 | # e.g. should not replace &#nn; ¯ and &abc;
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167 | # $str =~ s/&(?!($ReName|#[0-9]+|#x[0-9a-fA-F]+);)/&/go;
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168 |
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169 | $str;
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170 | }
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171 |
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172 | #
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173 | # Opposite of XmlUtf8Decode plus it adds prefix "&#" or "&#x" and suffix ";"
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174 | # The 2nd parameter ($hex) indicates whether the result is hex encoded or not.
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175 | #
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176 | sub XmlUtf8Decode
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177 | {
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178 | my ($str, $hex) = @_;
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179 | my $len = length ($str);
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180 | my $n;
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181 |
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182 | if ($len == 2) {
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183 | my @n = unpack "C2", $str;
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184 | $n = (($n[0] & 0x3f) << 6) + ($n[1] & 0x3f);
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185 | }
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186 | elsif ($len == 3) {
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187 | my @n = unpack "C3", $str;
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188 | $n = (($n[0] & 0x1f) << 12) + (($n[1] & 0x3f) << 6) +
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189 | ($n[2] & 0x3f);
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190 | }
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191 | elsif ($len == 4) {
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192 | my @n = unpack "C4", $str;
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193 | $n = (($n[0] & 0x0f) << 18) + (($n[1] & 0x3f) << 12) +
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194 | (($n[2] & 0x3f) << 6) + ($n[3] & 0x3f);
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195 | }
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196 | elsif ($len == 1) { # just to be complete...
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197 | $n = ord ($str);
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198 | }
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199 | else {
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200 | die "bad value [$str] for XmlUtf8Decode";
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201 | }
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202 | $hex ? sprintf ("&#x%x;", $n) : "&#$n;";
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203 | }
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204 |
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205 | sub new {
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206 | my $class = shift;
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207 | no strict 'refs';
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208 | my $impl = $class . "Impl";
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209 | my $this = $impl->new(@_);
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210 | if ($XML::XPath::SafeMode) {
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211 | return $this;
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212 | }
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213 | my $self = \$this;
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214 | return bless $self, $class;
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215 | }
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216 |
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217 | sub AUTOLOAD {
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218 | my $method = $AUTOLOAD;
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219 | $method =~ s/.*:://;
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220 | # warn "AUTOLOAD $method!\n";
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221 | no strict 'refs';
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222 | *{$AUTOLOAD} = sub {
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223 | my $self = shift;
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224 | my $olderror = $@; # store previous exceptions
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225 | my $obj = eval { $$self };
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226 | if ($@) {
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227 | if ($@ =~ /Not a SCALAR reference/) {
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228 | croak("No such method $method in " . ref($self));
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229 | }
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230 | croak $@;
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231 | }
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232 | if ($obj) {
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233 | # make sure $@ propogates if this method call was the result
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234 | # of losing scope because of a die().
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235 | if ($method =~ /^(DESTROY|del_parent_link)$/) {
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236 | $obj->$method(@_);
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237 | $@ = $olderror if $olderror;
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238 | return;
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239 | }
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240 | return $obj->$method(@_);
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241 | }
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242 | };
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243 | goto &$AUTOLOAD;
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244 | }
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245 |
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246 | package XML::XPath::NodeImpl;
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247 |
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248 | use vars qw/@ISA $AUTOLOAD/;
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249 | @ISA = ('XML::XPath::Node');
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250 |
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251 | sub new {
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252 | die "Virtual base method";
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253 | }
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254 |
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255 | sub getNodeType {
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256 | my $self = shift;
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257 | return XML::XPath::Node::UNKNOWN_NODE;
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258 | }
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259 |
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260 | sub isElementNode {}
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261 | sub isAttributeNode {}
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262 | sub isNamespaceNode {}
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263 | sub isTextNode {}
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264 | sub isProcessingInstructionNode {}
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265 | sub isPINode {}
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266 | sub isCommentNode {}
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267 |
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268 | sub getNodeValue {
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269 | return;
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270 | }
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271 |
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272 | sub getValue {
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273 | shift->getNodeValue(@_);
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274 | }
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275 |
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276 | sub setNodeValue {
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277 | return;
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278 | }
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279 |
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280 | sub setValue {
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281 | shift->setNodeValue(@_);
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282 | }
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283 |
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284 | sub getParentNode {
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285 | my $self = shift;
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286 | return $self->[XML::XPath::Node::node_parent];
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287 | }
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288 |
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289 | sub getRootNode {
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290 | my $self = shift;
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291 | while (my $parent = $self->getParentNode) {
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292 | $self = $parent;
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293 | }
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294 | return $self;
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295 | }
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296 |
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297 | sub getElementById {
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298 | my $self = shift;
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299 | my ($id) = @_;
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300 | # warn "getElementById: $id\n";
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301 | my $root = $self->getRootNode;
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302 | my $node = $root->[XML::XPath::Node::node_ids]{$id};
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303 | # warn "returning node: ", $node->getName, "\n";
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304 | return $node;
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305 | }
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306 |
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307 | sub getName { }
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308 | sub getData { }
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309 |
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310 | sub getChildNodes {
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311 | return wantarray ? () : [];
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312 | }
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313 |
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314 | sub getChildNode {
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315 | return;
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316 | }
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317 |
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318 | sub getAttribute {
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319 | return;
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320 | }
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321 |
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322 | sub getAttributes {
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323 | return wantarray ? () : [];
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324 | }
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325 |
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326 | sub getAttributeNodes {
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327 | shift->getAttributes(@_);
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328 | }
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329 |
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330 | sub getNamespaceNodes {
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331 | return wantarray ? () : [];
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332 | }
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333 |
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334 | sub getNamespace {
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335 | return;
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336 | }
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337 |
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338 | sub getLocalName {
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339 | return;
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340 | }
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341 |
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342 | sub string_value { return; }
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343 |
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344 | sub get_pos {
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345 | my $self = shift;
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346 | return $self->[XML::XPath::Node::node_pos];
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347 | }
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348 |
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349 | sub set_pos {
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350 | my $self = shift;
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351 | $self->[XML::XPath::Node::node_pos] = shift;
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352 | }
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353 |
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354 | sub get_global_pos {
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355 | my $self = shift;
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356 | return $self->[XML::XPath::Node::node_global_pos];
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357 | }
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358 |
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359 | sub set_global_pos {
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360 | my $self = shift;
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361 | $self->[XML::XPath::Node::node_global_pos] = shift;
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362 | }
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363 |
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364 | sub renumber {
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365 | my $self = shift;
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366 | my $search = shift;
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367 | my $diff = shift;
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368 |
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369 | foreach my $node ($self->findnodes($search)) {
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370 | $node->set_global_pos(
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371 | $node->get_global_pos + $diff
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372 | );
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373 | }
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374 | }
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375 |
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376 | sub insertAfter {
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377 | my $self = shift;
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378 | my $newnode = shift;
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379 | my $posnode = shift;
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380 |
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381 | my $pos_number = eval { $posnode->[XML::XPath::Node::node_children][-1]->get_global_pos() + 1; };
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382 | if (!defined $pos_number) {
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383 | $pos_number = $posnode->get_global_pos() + 1;
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384 | }
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385 |
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386 | eval {
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387 | if ($pos_number ==
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388 | $posnode->findnodes(
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389 | 'following::node()'
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390 | )->get_node(1)->get_global_pos()) {
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391 | $posnode->renumber('following::node()', +5);
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392 | }
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393 | };
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394 |
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395 | my $pos = $posnode->get_pos;
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396 |
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397 | $newnode->setParentNode($self);
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398 | splice @{$self->[XML::XPath::Node::node_children]}, $pos + 1, 0, $newnode;
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399 |
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400 | for (my $i = $pos + 1; $i < @{$self->[XML::XPath::Node::node_children]}; $i++) {
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401 | $self->[XML::XPath::Node::node_children][$i]->set_pos($i);
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402 | }
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403 |
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404 | $newnode->set_global_pos($pos_number);
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405 | }
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406 |
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407 | sub insertBefore {
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408 | my $self = shift;
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409 | my $newnode = shift;
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410 | my $posnode = shift;
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411 |
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412 | my $pos_number = ($posnode->getPreviousSibling() || $posnode->getParentNode)->get_global_pos();
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413 | if ($pos_number == $posnode->get_global_pos()) {
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414 | $posnode->renumber('self::node() | descendant::node() | following::node()', +5);
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415 | }
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416 |
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417 | my $pos = $posnode->get_pos;
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418 |
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419 | $newnode->setParentNode($self);
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420 | splice @{$self->[XML::XPath::Node::node_children]}, $pos, 0, $newnode;
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421 |
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422 | for (my $i = $pos; $i < @{$self->[XML::XPath::Node::node_children]}; $i++) {
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423 | $self->[XML::XPath::Node::node_children][$i]->set_pos($i);
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424 | }
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425 |
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426 | $newnode->set_global_pos($pos_number);
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427 | }
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428 |
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429 | sub getPreviousSibling {
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430 | my $self = shift;
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431 | my $pos = $self->[XML::XPath::Node::node_pos];
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432 | return unless $self->[XML::XPath::Node::node_parent];
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433 | return $self->[XML::XPath::Node::node_parent]->getChildNode($pos);
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434 | }
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435 |
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436 | sub getNextSibling {
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437 | my $self = shift;
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438 | my $pos = $self->[XML::XPath::Node::node_pos];
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439 | return unless $self->[XML::XPath::Node::node_parent];
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440 | return $self->[XML::XPath::Node::node_parent]->getChildNode($pos + 2);
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441 | }
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442 |
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443 | sub setParentNode {
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444 | my $self = shift;
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445 | my $parent = shift;
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446 | # warn "SetParent of ", ref($self), " to ", $parent->[XML::XPath::Node::node_name], "\n";
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447 | $self->[XML::XPath::Node::node_parent] = $parent;
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448 | }
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449 |
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450 | sub del_parent_link {
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451 | my $self = shift;
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452 | $self->[XML::XPath::Node::node_parent] = undef;
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453 | }
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454 |
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455 | sub dispose {
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456 | my $self = shift;
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457 | foreach my $kid ($self->getChildNodes) {
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458 | $kid->dispose;
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459 | }
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460 | foreach my $kid ($self->getAttributeNodes) {
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461 | $kid->dispose;
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462 | }
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463 | foreach my $kid ($self->getNamespaceNodes) {
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464 | $kid->dispose;
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465 | }
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466 | $self->[XML::XPath::Node::node_parent] = undef;
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467 | }
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468 |
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469 | sub to_number {
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470 | my $num = shift->string_value;
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471 | return XML::XPath::Number->new($num);
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472 | }
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473 |
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474 | sub find {
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475 | my $node = shift;
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476 | my ($path) = @_;
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477 | my $xp = XML::XPath->new(); # new is v. lightweight
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478 | return $xp->find($path, $node);
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479 | }
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480 |
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481 | sub findvalue {
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482 | my $node = shift;
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483 | my ($path) = @_;
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484 | my $xp = XML::XPath->new();
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485 | return $xp->findvalue($path, $node);
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486 | }
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487 |
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488 | sub findnodes {
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489 | my $node = shift;
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490 | my ($path) = @_;
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491 | my $xp = XML::XPath->new();
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492 | return $xp->findnodes($path, $node);
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493 | }
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494 |
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495 | sub matches {
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496 | my $node = shift;
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497 | my ($path, $context) = @_;
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498 | my $xp = XML::XPath->new();
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499 | return $xp->matches($node, $path, $context);
|
---|
500 | }
|
---|
501 |
|
---|
502 | sub to_sax {
|
---|
503 | my $self = shift;
|
---|
504 | unshift @_, 'Handler' if @_ == 1;
|
---|
505 | my %handlers = @_;
|
---|
506 |
|
---|
507 | my $doch = $handlers{DocumentHandler} || $handlers{Handler};
|
---|
508 | my $dtdh = $handlers{DTDHandler} || $handlers{Handler};
|
---|
509 | my $enth = $handlers{EntityResolver} || $handlers{Handler};
|
---|
510 |
|
---|
511 | $self->_to_sax ($doch, $dtdh, $enth);
|
---|
512 | }
|
---|
513 |
|
---|
514 | sub DESTROY {}
|
---|
515 |
|
---|
516 | use Carp;
|
---|
517 |
|
---|
518 | sub _to_sax {
|
---|
519 | carp "_to_sax not implemented in ", ref($_[0]);
|
---|
520 | }
|
---|
521 |
|
---|
522 | 1;
|
---|
523 | __END__
|
---|
524 |
|
---|
525 | =head1 NAME
|
---|
526 |
|
---|
527 | XML::XPath::Node - internal representation of a node
|
---|
528 |
|
---|
529 | =head1 API
|
---|
530 |
|
---|
531 | The Node API aims to emulate DOM to some extent, however the API
|
---|
532 | isn't quite compatible with DOM. This is to ease transition from
|
---|
533 | XML::DOM programming to XML::XPath. Compatibility with DOM may
|
---|
534 | arise once XML::DOM gets namespace support.
|
---|
535 |
|
---|
536 | =head2 new
|
---|
537 |
|
---|
538 | Creates a new node. See the sub-classes for parameters to pass to new().
|
---|
539 |
|
---|
540 | =head2 getNodeType
|
---|
541 |
|
---|
542 | Returns one of ELEMENT_NODE, TEXT_NODE, COMMENT_NODE, ATTRIBUTE_NODE,
|
---|
543 | PROCESSING_INSTRUCTION_NODE or NAMESPACE_NODE. UNKNOWN_NODE is returned
|
---|
544 | if the sub-class doesn't implement getNodeType - but that means
|
---|
545 | something is broken! The constants are exported by default from
|
---|
546 | XML::XPath::Node. The constants have the same numeric value as the
|
---|
547 | XML::DOM versions.
|
---|
548 |
|
---|
549 | =head2 getParentNode
|
---|
550 |
|
---|
551 | Returns the parent of this node, or undef if this is the root node. Note
|
---|
552 | that the root node is the root node in terms of XPath - not the root
|
---|
553 | element node.
|
---|
554 |
|
---|
555 | =head2 to_sax ( $handler | %handlers )
|
---|
556 |
|
---|
557 | Generates sax calls to the handler or handlers. See the PerlSAX docs for
|
---|
558 | details (not yet implemented correctly).
|
---|
559 |
|
---|
560 | =head1 MORE INFO
|
---|
561 |
|
---|
562 | See the sub-classes for the meaning of the rest of the API:
|
---|
563 |
|
---|
564 | =over 4
|
---|
565 |
|
---|
566 | =item *
|
---|
567 |
|
---|
568 | L<XML::XPath::Node::Element>
|
---|
569 |
|
---|
570 | =item *
|
---|
571 |
|
---|
572 | L<XML::XPath::Node::Attribute>
|
---|
573 |
|
---|
574 | =item *
|
---|
575 |
|
---|
576 | L<XML::XPath::Node::Namespace>
|
---|
577 |
|
---|
578 | =item *
|
---|
579 |
|
---|
580 | L<XML::XPath::Node::Text>
|
---|
581 |
|
---|
582 | =item *
|
---|
583 |
|
---|
584 | L<XML::XPath::Node::Comment>
|
---|
585 |
|
---|
586 | =item *
|
---|
587 |
|
---|
588 | L<XML::XPath::Node::PI>
|
---|
589 |
|
---|
590 | =back
|
---|
591 |
|
---|
592 | =cut
|
---|