1 | <?php |
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2 | |
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3 | // |
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4 | // +----------------------------------------------------------------------+ |
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5 | // | <phpXML/> version 1.0 | |
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6 | // | Copyright (c) 2001 Michael P. Mehl. All rights reserved. | |
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7 | // +----------------------------------------------------------------------+ |
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8 | // | Latest releases are available at http://phpxml.org/. For feedback or | |
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9 | // | bug reports, please contact the author at mpm@phpxml.org. Thanks! | |
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10 | // +----------------------------------------------------------------------+ |
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11 | // | The contents of this file are subject to the Mozilla Public License | |
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12 | // | Version 1.1 (the "License"); you may not use this file except in | |
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13 | // | compliance with the License. You may obtain a copy of the License at | |
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14 | // | http://www.mozilla.org/MPL/ | |
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15 | // | | |
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16 | // | Software distributed under the License is distributed on an "AS IS" | |
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17 | // | basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See | |
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18 | // | the License for the specific language governing rights and | |
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19 | // | limitations under the License. | |
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20 | // | | |
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21 | // | The Original Code is <phpXML/>. | |
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22 | // | | |
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23 | // | The Initial Developer of the Original Code is Michael P. Mehl. | |
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24 | // | Portions created by Michael P. Mehl are Copyright (C) 2001 Michael | |
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25 | // | P. Mehl. All Rights Reserved. | |
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26 | // +----------------------------------------------------------------------+ |
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27 | // | Authors: | |
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28 | // | Michael P. Mehl <mpm@phpxml.org> | |
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29 | // +----------------------------------------------------------------------+ |
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30 | // |
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31 | |
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32 | /** |
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33 | * Class for accessing XML data through the XPath language. |
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34 | * |
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35 | * This class offers methods for accessing the nodes of a XML document using |
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36 | * the XPath language. You can add or remove nodes, set or modify their |
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37 | * content and their attributes. No additional PHP extensions like DOM XML |
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38 | * or something similar are required to use these features. |
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39 | * |
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40 | * @link http://www.phpxml.org/ Latest release of this class |
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41 | * @link http://www.w3.org/TR/xpath W3C XPath Recommendation |
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42 | * @copyright Copyright (c) 2001 Michael P. Mehl. All rights reserved. |
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43 | * @author Michael P. Mehl <mpm@phpxml.org> |
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44 | * @version 1.0 (2001-03-08) |
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45 | * @access public |
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46 | */ |
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47 | |
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48 | class XML |
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49 | { |
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50 | /** |
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51 | * List of all document nodes. |
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52 | * |
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53 | * This array contains a list of all document nodes saved as an |
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54 | * associative array. |
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55 | * |
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56 | * @access private |
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57 | * @var array |
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58 | */ |
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59 | var $nodes = array(); |
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60 | |
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61 | /** |
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62 | * List of document node IDs. |
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63 | * |
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64 | * This array contains a list of all IDs of all document nodes that |
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65 | * are used for counting when adding a new node. |
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66 | * |
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67 | * @access private |
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68 | * @var array |
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69 | */ |
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70 | var $ids = array(); |
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71 | |
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72 | /** |
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73 | * Current document path. |
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74 | * |
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75 | * This variable saves the current path while parsing a XML file and adding |
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76 | * the nodes being read from the file. |
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77 | * |
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78 | * @access private |
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79 | * @var string |
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80 | */ |
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81 | var $path = ""; |
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82 | |
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83 | /** |
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84 | * Current document position. |
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85 | * |
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86 | * This variable counts the current document position while parsing a XML |
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87 | * file and adding the nodes being read from the file. |
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88 | * |
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89 | * @access private |
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90 | * @var int |
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91 | */ |
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92 | var $position = 0; |
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93 | |
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94 | /** |
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95 | * Path of the document root. |
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96 | * |
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97 | * This string contains the full path to the node that acts as the root |
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98 | * node of the whole document. |
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99 | * |
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100 | * @access private |
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101 | * @var string |
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102 | */ |
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103 | var $root = ""; |
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104 | |
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105 | /** |
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106 | * Current XPath expression. |
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107 | * |
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108 | * This string contains the full XPath expression being parsed currently. |
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109 | * |
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110 | * @access private |
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111 | * @var string |
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112 | */ |
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113 | var $xpath = ""; |
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114 | |
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115 | /** |
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116 | * List of entities to be converted. |
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117 | * |
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118 | * This array contains a list of entities to be converted when an XPath |
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119 | * expression is evaluated. |
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120 | * |
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121 | * @access private |
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122 | * @var array |
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123 | */ |
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124 | var $entities = array ( "&" => "&", "<" => "<", ">" => ">", |
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125 | "'" => "&apos", '"' => """ ); |
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126 | |
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127 | /** |
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128 | * List of supported XPath axes. |
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129 | * |
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130 | * This array contains a list of all valid axes that can be evaluated in an |
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131 | * XPath expression. |
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132 | * |
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133 | * @access private |
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134 | * @var array |
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135 | */ |
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136 | var $axes = array ( "child", "descendant", "parent", "ancestor", |
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137 | "following-sibling", "preceding-sibling", "following", "preceding", |
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138 | "attribute", "namespace", "self", "descendant-or-self", |
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139 | "ancestor-or-self" ); |
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140 | |
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141 | /** |
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142 | * List of supported XPath functions. |
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143 | * |
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144 | * This array contains a list of all valid functions that can be evaluated |
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145 | * in an XPath expression. |
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146 | * |
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147 | * @access private |
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148 | * @var array |
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149 | */ |
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150 | var $functions = array ( "last", "position", "count", "id", "name", |
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151 | "string", "concat", "starts-with", "contains", "substring-before", |
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152 | "substring-after", "substring", "string-length", "translate", |
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153 | "boolean", "not", "true", "false", "lang", "number", "sum", "floor", |
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154 | "ceiling", "round", "text" ); |
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155 | |
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156 | /** |
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157 | * List of supported XPath operators. |
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158 | * |
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159 | * This array contains a list of all valid operators that can be evaluated |
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160 | * in a predicate of an XPath expression. The list is ordered by the |
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161 | * precedence of the operators (lowest precedence first). |
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162 | * |
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163 | * @access private |
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164 | * @var array |
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165 | */ |
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166 | var $operators = array( " or ", " and ", "=", "!=", "<=", "<", ">=", ">", |
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167 | "+", "-", "*", " div ", " mod " ); |
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168 | |
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169 | /** |
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170 | * Constructor of the class. |
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171 | * |
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172 | * This constructor initializes the class and, when a filename is given, |
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173 | * tries to read and parse the given file. |
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174 | * |
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175 | * @access public |
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176 | * @author Michael P. Mehl <mpm@phpxml.org> |
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177 | * @param string $file Path and name of the file to read and parsed. |
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178 | * @see load_file() |
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179 | */ |
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180 | function XML ( $file = "" ) |
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181 | { |
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182 | // Check whether a file was given. |
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183 | if ( !empty($file) ) |
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184 | { |
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185 | // Load the XML file. |
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186 | $this->load_file($file); |
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187 | } |
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188 | } |
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189 | |
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190 | /** |
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191 | * Reads a file and parses the XML data. |
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192 | * |
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193 | * This method reads the content of a XML file, tries to parse its |
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194 | * content and upon success stores the information retrieved from |
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195 | * the file into an array. |
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196 | * |
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197 | * @access public |
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198 | * @author Michael P. Mehl <mpm@phpxml.org> |
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199 | * @param string $file Path and name of the file to be read and parsed. |
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200 | * @see handle_start_element(), handle_end_element(), |
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201 | * handle_character_data() |
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202 | */ |
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203 | function load_file ( $file ) |
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204 | { |
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205 | // Check whether the file exists and is readable. |
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206 | if ( file_exists($file) && is_readable($file) ) |
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207 | { |
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208 | // Read the content of the file. |
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209 | $content = implode("", file($file)); |
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210 | |
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211 | // Check whether content has been read. |
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212 | if ( !empty($content) ) |
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213 | { |
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214 | // Create an XML parser. |
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215 | $parser = xml_parser_create(); |
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216 | |
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217 | // Set the options for parsing the XML data. |
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218 | xml_parser_set_option($parser, XML_OPTION_SKIP_WHITE, 1); |
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219 | xml_parser_set_option($parser, XML_OPTION_CASE_FOLDING, 0); |
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220 | |
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221 | // Set the object for the parser. |
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222 | xml_set_object($parser, &$this); |
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223 | |
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224 | // Set the element handlers for the parser. |
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225 | xml_set_element_handler($parser, "handle_start_element", |
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226 | "handle_end_element"); |
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227 | xml_set_character_data_handler($parser, |
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228 | "handle_character_data"); |
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229 | |
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230 | // Parse the XML file. |
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231 | if ( !xml_parse($parser, $content, true) ) |
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232 | { |
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233 | // Display an error message. |
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234 | $this->display_error("XML error in file %s, line %d: %s", |
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235 | $file, xml_get_current_line_number($parser), |
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236 | xml_error_string(xml_get_error_code($parser))); |
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237 | } |
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238 | |
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239 | // Free the parser. |
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240 | xml_parser_free($parser); |
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241 | } |
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242 | } |
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243 | else |
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244 | { |
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245 | // Display an error message. |
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246 | $this->display_error("File %s could not be found or read.", $file); |
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247 | } |
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248 | } |
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249 | |
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250 | /** |
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251 | * Generates a XML file with the content of the current document. |
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252 | * |
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253 | * This method creates a string containing the XML data being read |
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254 | * and modified by this class before. This string can be used to save |
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255 | * a modified document back to a file or doing other nice things with |
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256 | * it. |
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257 | * |
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258 | * @access public |
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259 | * @author Michael P. Mehl <mpm@phpxml.org> |
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260 | * @param array $highlight Array containing a list of full document |
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261 | * paths of nodes to be highlighted by <font>...</font> tags |
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262 | * in the generated XML string. |
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263 | * @param string $root While doing a recursion with this method, this |
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264 | * parameter is used for internal purpose. |
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265 | * @param int $level While doing a recursion with this method, this |
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266 | * parameter is used for internal purpose. |
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267 | * @return string The returned string contains well-formed XML data |
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268 | * representing the content of this document. |
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269 | * @see load_file(), evaluate(), get_content() |
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270 | */ |
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271 | function get_file ( $highlight = array(), $root = "", $level = 0 ) |
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272 | { |
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273 | // Create a string to save the generated XML data. |
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274 | $xml = ""; |
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275 | |
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276 | // Create two strings containing the tags for highlighting a node. |
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277 | $highlight_start = "<font color=\"#FF0000\"><b>"; |
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278 | $highlight_end = "</b></font>"; |
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279 | |
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280 | // Generate a string to be displayed before the tags. |
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281 | $before = ""; |
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282 | |
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283 | // Calculate the amount of whitespaces to display. |
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284 | for ( $i = 0; $i < ( $level * 2 ); $i++ ) |
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285 | { |
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286 | // Add a whitespaces to the string. |
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287 | $before .= " "; |
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288 | } |
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289 | |
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290 | // Check whether a root node is given. |
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291 | if ( empty($root) ) |
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292 | { |
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293 | // Set it to the document root. |
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294 | $root = $this->root; |
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295 | } |
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296 | |
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297 | // Check whether the node is selected. |
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298 | $selected = in_array($root, $highlight); |
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299 | |
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300 | // Now add the whitespaces to the XML data. |
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301 | $xml .= $before; |
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302 | |
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303 | // Check whether the node is selected. |
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304 | if ( $selected ) |
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305 | { |
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306 | // Add the highlight code to the XML data. |
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307 | $xml .= $highlight_start; |
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308 | } |
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309 | |
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310 | // Now open the tag. |
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311 | $xml .= "<".$this->nodes[$root]["name"]; |
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312 | |
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313 | // Check whether there are attributes for this node. |
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314 | if ( count($this->nodes[$root]["attributes"]) > 0 ) |
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315 | { |
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316 | // Run through all attributes. |
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317 | foreach ( $this->nodes[$root]["attributes"] as $key => $value ) |
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318 | { |
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319 | // Check whether this attribute is highlighted. |
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320 | if ( in_array($root."/attribute::".$key, $highlight) ) |
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321 | { |
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322 | // Add the highlight code to the XML data. |
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323 | $xml .= $highlight_start; |
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324 | } |
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325 | |
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326 | // Add the attribute to the XML data. |
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327 | $xml .= " ".$key."=\"".trim(stripslashes($value))."\""; |
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328 | |
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329 | // Check whether this attribute is highlighted. |
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330 | if ( in_array($root."/attribute::".$key, $highlight) ) |
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331 | { |
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332 | // Add the highlight code to the XML data. |
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333 | $xml .= $highlight_end; |
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334 | } |
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335 | } |
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336 | } |
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337 | |
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338 | // Check whether the node contains character data or has children. |
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339 | if ( empty($this->nodes[$root]["text"]) && |
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340 | !isset($this->nodes[$root]["children"]) ) |
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341 | { |
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342 | // Add the end to the tag. |
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343 | $xml .= "/"; |
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344 | } |
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345 | |
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346 | // Close the tag. |
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347 | $xml .= ">\n"; |
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348 | |
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349 | // Check whether the node is selected. |
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350 | if ( $selected ) |
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351 | { |
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352 | // Add the highlight code to the XML data. |
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353 | $xml .= $highlight_end; |
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354 | } |
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355 | |
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356 | // Check whether the node contains character data. |
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357 | if ( !empty($this->nodes[$root]["text"]) ) |
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358 | { |
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359 | // Add the character data to the XML data. |
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360 | $xml .= $before." ".$this->nodes[$root]["text"]."\n"; |
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361 | } |
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362 | |
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363 | // Check whether the node has children. |
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364 | if ( isset($this->nodes[$root]["children"]) ) |
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365 | { |
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366 | // Run through all children with different names. |
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367 | foreach ( $this->nodes[$root]["children"] as $child => $pos ) |
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368 | { |
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369 | // Run through all children with the same name. |
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370 | for ( $i = 1; $i <= $pos; $i++ ) |
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371 | { |
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372 | // Generate the full path of the child. |
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373 | $fullchild = $root."/".$child."[".$i."]"; |
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374 | |
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375 | // Add the child's XML data to the existing data. |
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376 | $xml .= $this->get_file($highlight, $fullchild, |
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377 | $level + 1); |
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378 | } |
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379 | } |
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380 | } |
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381 | |
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382 | // Check whether there are attributes for this node. |
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383 | if ( !empty($this->nodes[$root]["text"]) || |
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384 | isset($this->nodes[$root]["children"]) ) |
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385 | { |
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386 | // Add the whitespaces to the XML data. |
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387 | $xml .= $before; |
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388 | |
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389 | // Check whether the node is selected. |
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390 | if ( $selected ) |
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391 | { |
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392 | // Add the highlight code to the XML data. |
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393 | $xml .= $highlight_start; |
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394 | } |
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395 | |
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396 | // Add the closing tag. |
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397 | $xml .= "</".$this->nodes[$root]["name"].">"; |
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398 | |
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399 | // Check whether the node is selected. |
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400 | if ( $selected ) |
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401 | { |
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402 | // Add the highlight code to the XML data. |
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403 | $xml .= $highlight_end; |
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404 | } |
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405 | |
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406 | // Add a linebreak. |
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407 | $xml .= "\n"; |
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408 | } |
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409 | |
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410 | // Return the XML data. |
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411 | return $xml; |
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412 | } |
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413 | |
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414 | /** |
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415 | * Adds a new node to the XML document. |
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416 | * |
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417 | * This method adds a new node to the tree of nodes of the XML document |
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418 | * being handled by this class. The new node is created according to the |
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419 | * parameters passed to this method. |
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420 | * |
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421 | * @access public |
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422 | * @author Michael P. Mehl <mpm@phpxml.org> |
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423 | * @param string $content Full path of the parent, to which the new |
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424 | * node should be added as a child. |
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425 | * @param string $name Name of the new node. |
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426 | * @return string The string returned by this method will contain the |
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427 | * full document path of the created node. |
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428 | * @see remove_node(), evaluate() |
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429 | */ |
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430 | function add_node ( $context, $name ) |
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431 | { |
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432 | // Check whether a name for this element is already set. |
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433 | if ( empty($this->root) ) |
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434 | { |
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435 | // Use this tag as the root element. |
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436 | $this->root = "/".$name."[1]"; |
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437 | } |
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438 | |
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439 | // Calculate the full path for this element. |
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440 | $path = $context."/".$name; |
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441 | |
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442 | // Set the relative context and the position. |
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443 | $position = ++$this->ids[$path]; |
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444 | $relative = $name."[".$position."]"; |
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445 | |
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446 | // Calculate the full path. |
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447 | $fullpath = $context."/".$relative; |
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448 | |
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449 | // Calculate the context position, which is the position of this |
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450 | // element within elements of the same name in the parent node. |
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451 | $this->nodes[$fullpath]["context-position"] = $position; |
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452 | |
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453 | // Calculate the position for the following and preceding axis |
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454 | // detection. |
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455 | $this->nodes[$fullpath]["document-position"] = |
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456 | $this->nodes[$context]["document-position"] + 1; |
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457 | |
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458 | // Save the information about the node. |
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459 | $this->nodes[$fullpath]["name"] = $name; |
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460 | $this->nodes[$fullpath]["text"] = ""; |
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461 | $this->nodes[$fullpath]["parent"] = $context; |
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462 | |
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463 | // Add this element to the element count array. |
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464 | if ( !$this->nodes[$context]["children"][$name] ) |
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465 | { |
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466 | // Set the default name. |
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467 | $this->nodes[$context]["children"][$name] = 1; |
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468 | } |
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469 | else |
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470 | { |
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471 | // Calculate the name. |
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472 | $this->nodes[$context]["children"][$name] = |
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473 | $this->nodes[$context]["children"][$name] + 1; |
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474 | } |
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475 | |
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476 | // Return the path of the new node. |
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477 | return $fullpath; |
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478 | } |
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479 | |
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480 | /** |
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481 | * Removes a node from the XML document. |
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482 | * |
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483 | * This method removes a node from the tree of nodes of the XML document. |
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484 | * If the node is a document node, all children of the node and its |
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485 | * character data will be removed. If the node is an attribute node, |
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486 | * only this attribute will be removed, the node to which the attribute |
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487 | * belongs as well as its children will remain unmodified. |
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488 | * |
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489 | * @access public |
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490 | * @author Michael P. Mehl <mpm@phpxml.org> |
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491 | * @param string $node Full path of the node to be removed. |
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492 | * @see add_node(), evaluate() |
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493 | */ |
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494 | function remove_node ( $node ) |
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495 | { |
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496 | // Check whether the node is an attribute node. |
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497 | if ( ereg("/attribute::", $node) ) |
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498 | { |
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499 | // Get the path to the attribute node's parent. |
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500 | $parent = $this->prestr($node, "/attribute::"); |
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501 | |
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502 | // Get the name of the attribute. |
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503 | $attribute = $this->afterstr($node, "/attribute::"); |
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504 | |
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505 | // Check whether the attribute exists. |
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506 | if ( isset($this->nodes[$parent]["attributes"][$attribute]) ) |
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507 | { |
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508 | // Create a new array. |
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509 | $new = array(); |
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510 | |
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511 | // Run through the existing attributes. |
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512 | foreach ( $this->nodes[$parent]["attributes"] |
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513 | as $key => $value ) |
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514 | { |
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515 | // Check whether it's the attribute to remove. |
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516 | if ( $key != $attribute ) |
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517 | { |
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518 | // Add it to the new array again. |
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519 | $new[$key] = $value; |
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520 | } |
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521 | } |
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522 | |
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523 | // Save the new attributes. |
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524 | $this->nodes[$parent]["attributes"] = $new; |
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525 | } |
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526 | } |
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527 | else |
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528 | { |
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529 | // Create an associative array, which contains information about |
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530 | // all nodes that required to be renamed. |
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531 | $rename = array(); |
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532 | |
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533 | // Get the name, the parent and the siblings of current node. |
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534 | $name = $this->nodes[$node]["name"]; |
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535 | $parent = $this->nodes[$node]["parent"]; |
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536 | $siblings = $this->nodes[$parent]["children"][$name]; |
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537 | |
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538 | // Decrease the number of children. |
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539 | $this->nodes[$parent]["children"][$name]--; |
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540 | |
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541 | // Create a counter for renumbering the siblings. |
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542 | $counter = 1; |
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543 | |
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544 | // Now run through the siblings. |
---|
545 | for ( $i = 1; $i <= $siblings; $i++ ) |
---|
546 | { |
---|
547 | // Create the name of the sibling. |
---|
548 | $sibling = $parent."/".$name."[".$i."]"; |
---|
549 | |
---|
550 | // Check whether it's the name of the current node. |
---|
551 | if ( $sibling != $node ) |
---|
552 | { |
---|
553 | // Create the new name for the sibling. |
---|
554 | $new = $parent."/".$name."[".$counter."]"; |
---|
555 | |
---|
556 | // Increase the counter. |
---|
557 | $counter++; |
---|
558 | |
---|
559 | // Add the old and the new name to the list of nodes |
---|
560 | // to be renamed. |
---|
561 | $rename[$sibling] = $new; |
---|
562 | } |
---|
563 | } |
---|
564 | |
---|
565 | // Create an array for saving the new node-list. |
---|
566 | $nodes = array(); |
---|
567 | |
---|
568 | // Now run through through the existing nodes. |
---|
569 | foreach ( $this->nodes as $name => $values ) |
---|
570 | { |
---|
571 | // Check the position of the path of the node to be deleted |
---|
572 | // in the path of the current node. |
---|
573 | $position = strpos($name, $node); |
---|
574 | |
---|
575 | // Check whether it's not the node to be deleted. |
---|
576 | if ( $position === false ) |
---|
577 | { |
---|
578 | // Run through the array of nodes to be renamed. |
---|
579 | foreach ( $rename as $old => $new ) |
---|
580 | { |
---|
581 | // Check whether this node and it's parent requires to |
---|
582 | // be renamed. |
---|
583 | $name = str_replace($old, $new, $name); |
---|
584 | $values["parent"] = str_replace($old, $new, |
---|
585 | $values["parent"]); |
---|
586 | } |
---|
587 | |
---|
588 | // Add the node to the list of nodes. |
---|
589 | $nodes[$name] = $values; |
---|
590 | } |
---|
591 | } |
---|
592 | |
---|
593 | // Save the new array of nodes. |
---|
594 | $this->nodes = $nodes; |
---|
595 | } |
---|
596 | } |
---|
597 | |
---|
598 | /** |
---|
599 | * Add content to a node. |
---|
600 | * |
---|
601 | * This method adds content to a node. If it's an attribute node, then |
---|
602 | * the value of the attribute will be set, otherwise the character data of |
---|
603 | * the node will be set. The content is appended to existing content, |
---|
604 | * so nothing will be overwritten. |
---|
605 | * |
---|
606 | * @access public |
---|
607 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
608 | * @param string $path Full document path of the node. |
---|
609 | * @param string $value String containing the content to be added. |
---|
610 | * @see get_content(), evaluate() |
---|
611 | */ |
---|
612 | function add_content ( $path, $value ) |
---|
613 | { |
---|
614 | // Check whether it's an attribute node. |
---|
615 | if ( ereg("/attribute::", $path) ) |
---|
616 | { |
---|
617 | // Get the path to the attribute node's parent. |
---|
618 | $parent = $this->prestr($path, "/attribute::"); |
---|
619 | |
---|
620 | // Get the parent node. |
---|
621 | $parent = $this->nodes[$parent]; |
---|
622 | |
---|
623 | // Get the name of the attribute. |
---|
624 | $attribute = $this->afterstr($path, "/attribute::"); |
---|
625 | |
---|
626 | // Set the attribute. |
---|
627 | $parent["attributes"][$attribute] .= $value; |
---|
628 | } |
---|
629 | else |
---|
630 | { |
---|
631 | // Set the character data of the node. |
---|
632 | $this->nodes[$path]["text"] .= $value; |
---|
633 | } |
---|
634 | } |
---|
635 | |
---|
636 | /** |
---|
637 | * Set the content of a node. |
---|
638 | * |
---|
639 | * This method sets the content of a node. If it's an attribute node, then |
---|
640 | * the value of the attribute will be set, otherwise the character data of |
---|
641 | * the node will be set. Existing content will be overwritten. |
---|
642 | * |
---|
643 | * @access public |
---|
644 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
645 | * @param string $path Full document path of the node. |
---|
646 | * @param string $value String containing the content to be set. |
---|
647 | * @see get_content(), evaluate() |
---|
648 | */ |
---|
649 | function set_content ( $path, $value ) |
---|
650 | { |
---|
651 | // Check whether it's an attribute node. |
---|
652 | if ( ereg("/attribute::", $path) ) |
---|
653 | { |
---|
654 | // Get the path to the attribute node's parent. |
---|
655 | $parent = $this->prestr($path, "/attribute::"); |
---|
656 | |
---|
657 | // Get the parent node. |
---|
658 | $parent = $this->nodes[$parent]; |
---|
659 | |
---|
660 | // Get the name of the attribute. |
---|
661 | $attribute = $this->afterstr($path, "/attribute::"); |
---|
662 | |
---|
663 | // Set the attribute. |
---|
664 | $parent["attributes"][$attribute] = $value; |
---|
665 | } |
---|
666 | else |
---|
667 | { |
---|
668 | // Set the character data of the node. |
---|
669 | $this->nodes[$path]["text"] = $value; |
---|
670 | } |
---|
671 | } |
---|
672 | |
---|
673 | /** |
---|
674 | * Retrieves the content of a node. |
---|
675 | * |
---|
676 | * This method retrieves the content of a node. If it's an attribute |
---|
677 | * node, then the value of the attribute will be retrieved, otherwise |
---|
678 | * it'll be the character data of the node. |
---|
679 | * |
---|
680 | * @access public |
---|
681 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
682 | * @param string $path Full document path of the node, from which the |
---|
683 | * content should be retrieved. |
---|
684 | * @return string The returned string contains either the value or the |
---|
685 | * character data of the node. |
---|
686 | * @see set_content(), evaluate() |
---|
687 | */ |
---|
688 | function get_content ( $path ) |
---|
689 | { |
---|
690 | // Check whether it's an attribute node. |
---|
691 | if ( ereg("/attribute::", $path) ) |
---|
692 | { |
---|
693 | // Get the path to the attribute node's parent. |
---|
694 | $parent = $this->prestr($path, "/attribute::"); |
---|
695 | |
---|
696 | // Get the parent node. |
---|
697 | $parent = $this->nodes[$parent]; |
---|
698 | |
---|
699 | // Get the name of the attribute. |
---|
700 | $attribute = $this->afterstr($path, "/attribute::"); |
---|
701 | |
---|
702 | // Get the attribute. |
---|
703 | $attribute = $parent["attributes"][$attribute]; |
---|
704 | |
---|
705 | // Return the value of the attribute. |
---|
706 | return $attribute; |
---|
707 | } |
---|
708 | else |
---|
709 | { |
---|
710 | // Return the cdata of the node. |
---|
711 | return stripslashes($this->nodes[$path]["text"]); |
---|
712 | } |
---|
713 | } |
---|
714 | |
---|
715 | /** |
---|
716 | * Add attributes to a node. |
---|
717 | * |
---|
718 | * This method adds attributes to a node. Existing attributes will not be |
---|
719 | * overwritten. |
---|
720 | * |
---|
721 | * @access public |
---|
722 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
723 | * @param string $path Full document path of the node, the attributes |
---|
724 | * should be added to. |
---|
725 | * @param array $attributes Associative array containing the new |
---|
726 | * attributes for the node. |
---|
727 | * @see set_content(), get_content() |
---|
728 | */ |
---|
729 | function add_attributes ( $path, $attributes ) |
---|
730 | { |
---|
731 | // Add the attributes to the node. |
---|
732 | $this->nodes[$path]["attributes"] = array_merge($attributes, |
---|
733 | $this->nodes[$path]["attributes"]); |
---|
734 | } |
---|
735 | |
---|
736 | /** |
---|
737 | * Sets the attributes of a node. |
---|
738 | * |
---|
739 | * This method sets the attributes of a node and overwrites all existing |
---|
740 | * attributes by doing this. |
---|
741 | * |
---|
742 | * @access public |
---|
743 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
744 | * @param string $path Full document path of the node, the attributes |
---|
745 | * of which should be set. |
---|
746 | * @param array $attributes Associative array containing the new |
---|
747 | * attributes for the node. |
---|
748 | * @see set_content(), get_content() |
---|
749 | */ |
---|
750 | function set_attributes ( $path, $attributes ) |
---|
751 | { |
---|
752 | // Set the attributes of the node. |
---|
753 | $this->nodes[$path]["attributes"] = $attributes; |
---|
754 | } |
---|
755 | |
---|
756 | /** |
---|
757 | * Retrieves a list of all attributes of a node. |
---|
758 | * |
---|
759 | * This method retrieves a list of all attributes of the node specified in |
---|
760 | * the argument. |
---|
761 | * |
---|
762 | * @access public |
---|
763 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
764 | * @param string $path Full document path of the node, from which the |
---|
765 | * list of attributes should be retrieved. |
---|
766 | * @return array The returned associative array contains the all |
---|
767 | * attributes of the specified node. |
---|
768 | * @see get_content(), $nodes, $ids |
---|
769 | */ |
---|
770 | function get_attributes ( $path ) |
---|
771 | { |
---|
772 | // Return the attributes of the node. |
---|
773 | return $this->nodes[$path]["attributes"]; |
---|
774 | } |
---|
775 | |
---|
776 | /** |
---|
777 | * Retrieves the name of a document node. |
---|
778 | * |
---|
779 | * This method retrieves the name of document node specified in the |
---|
780 | * argument. |
---|
781 | * |
---|
782 | * @access public |
---|
783 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
784 | * @param string $path Full document path of the node, from which the |
---|
785 | * name should be retrieved. |
---|
786 | * @return string The returned array contains the name of the specified |
---|
787 | * node. |
---|
788 | * @see get_content(), $nodes, $ids |
---|
789 | */ |
---|
790 | function get_name ( $path ) |
---|
791 | { |
---|
792 | // Return the name of the node. |
---|
793 | return $this->nodes[$path]["name"]; |
---|
794 | } |
---|
795 | |
---|
796 | /** |
---|
797 | * Evaluates an XPath expression. |
---|
798 | * |
---|
799 | * This method tries to evaluate an XPath expression by parsing it. A |
---|
800 | * XML document has to be read before this method is able to work. |
---|
801 | * |
---|
802 | * @access public |
---|
803 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
804 | * @param string $path XPath expression to be evaluated. |
---|
805 | * @param string $context Full path of a document node, starting |
---|
806 | * from which the XPath expression should be evaluated. |
---|
807 | * @return array The returned array contains a list of the full |
---|
808 | * document paths of all nodes that match the evaluated |
---|
809 | * XPath expression. |
---|
810 | * @see $nodes, $ids |
---|
811 | */ |
---|
812 | function evaluate ( $path, $context = "" ) |
---|
813 | { |
---|
814 | // Remove slashes and quote signs. |
---|
815 | $path = stripslashes($path); |
---|
816 | $path = str_replace("\"", "", $path); |
---|
817 | $path = str_replace("'", "", $path); |
---|
818 | |
---|
819 | // Split the paths into different paths. |
---|
820 | $paths = $this->split_paths($path); |
---|
821 | |
---|
822 | // Create an empty set to save the result. |
---|
823 | $result = array(); |
---|
824 | |
---|
825 | // Run through all paths. |
---|
826 | foreach ( $paths as $path ) |
---|
827 | { |
---|
828 | // Trim the path. |
---|
829 | $path = trim($path); |
---|
830 | |
---|
831 | // Save the current path. |
---|
832 | $this->xpath = $path; |
---|
833 | |
---|
834 | // Convert all entities. |
---|
835 | $path = strtr($path, array_flip($this->entities)); |
---|
836 | |
---|
837 | // Split the path at every slash. |
---|
838 | $steps = $this->split_steps($path); |
---|
839 | |
---|
840 | // Check whether the first element is empty. |
---|
841 | if ( empty($steps[0]) ) |
---|
842 | { |
---|
843 | // Remove the first and empty element. |
---|
844 | array_shift($steps); |
---|
845 | } |
---|
846 | |
---|
847 | // Start to evaluate the steps. |
---|
848 | $nodes = $this->evaluate_step($context, $steps); |
---|
849 | |
---|
850 | // Remove duplicated nodes. |
---|
851 | $nodes = array_unique($nodes); |
---|
852 | |
---|
853 | // Add the nodes to the result set. |
---|
854 | $result = array_merge($result, $nodes); |
---|
855 | } |
---|
856 | |
---|
857 | // Return the result. |
---|
858 | return $result; |
---|
859 | } |
---|
860 | |
---|
861 | /** |
---|
862 | * Handles opening XML tags while parsing. |
---|
863 | * |
---|
864 | * While parsing a XML document for each opening tag this method is |
---|
865 | * called. It'll add the tag found to the tree of document nodes. |
---|
866 | * |
---|
867 | * @access private |
---|
868 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
869 | * @param int $parser Handler for accessing the current XML parser. |
---|
870 | * @param string $name Name of the opening tag found in the document. |
---|
871 | * @param array $attributes Associative array containing a list of |
---|
872 | * all attributes of the tag found in the document. |
---|
873 | * @see handle_end_element(), handle_character_data(), $nodes, $ids |
---|
874 | */ |
---|
875 | function handle_start_element ( $parser, $name, $attributes ) |
---|
876 | { |
---|
877 | // Add a node. |
---|
878 | $this->path = $this->add_node($this->path, $name); |
---|
879 | |
---|
880 | // Set the attributes. |
---|
881 | $this->set_attributes($this->path, $attributes); |
---|
882 | } |
---|
883 | |
---|
884 | /** |
---|
885 | * Handles closing XML tags while parsing. |
---|
886 | * |
---|
887 | * While parsing a XML document for each closing tag this method is |
---|
888 | * called. |
---|
889 | * |
---|
890 | * @access private |
---|
891 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
892 | * @param int $parser Handler for accessing the current XML parser. |
---|
893 | * @param string $name Name of the closing tag found in the document. |
---|
894 | * @see handle_start_element(), handle_character_data(), $nodes, $ids |
---|
895 | */ |
---|
896 | function handle_end_element ( $parser, $name ) |
---|
897 | { |
---|
898 | // Jump back to the parent element. |
---|
899 | $this->path = substr($this->path, 0, strrpos($this->path, "/")); |
---|
900 | } |
---|
901 | |
---|
902 | /** |
---|
903 | * Handles character data while parsing. |
---|
904 | * |
---|
905 | * While parsing a XML document for each character data this method |
---|
906 | * is called. It'll add the character data to the document tree. |
---|
907 | * |
---|
908 | * @access private |
---|
909 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
910 | * @param int $parser Handler for accessing the current XML parser. |
---|
911 | * @param string $text Character data found in the document. |
---|
912 | * @see handle_start_element(), handle_end_element(), $nodes, $ids |
---|
913 | */ |
---|
914 | function handle_character_data ( $parser, $text ) |
---|
915 | { |
---|
916 | // Replace entities. |
---|
917 | $text = strtr($text, $this->entities); |
---|
918 | |
---|
919 | // Save the text. |
---|
920 | $this->add_content($this->path, addslashes(trim($text))); |
---|
921 | } |
---|
922 | |
---|
923 | /** |
---|
924 | * Splits an XPath expression into its different expressions. |
---|
925 | * |
---|
926 | * This method splits an XPath expression. Each expression can consists of |
---|
927 | * list of expression being separated from each other by a | character. |
---|
928 | * |
---|
929 | * @access private |
---|
930 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
931 | * @param string $expression The complete expression to be splitted |
---|
932 | * into its different expressions. |
---|
933 | * @return array The array returned from this method contains a list |
---|
934 | * of all expressions found in the expression passed to this |
---|
935 | * method as a parameter. |
---|
936 | * @see evalute() |
---|
937 | */ |
---|
938 | function split_paths ( $expression ) |
---|
939 | { |
---|
940 | // Create an empty array. |
---|
941 | $paths = array(); |
---|
942 | |
---|
943 | // Save the position of the slash. |
---|
944 | $position = -1; |
---|
945 | |
---|
946 | // Run through the expression. |
---|
947 | do |
---|
948 | { |
---|
949 | // Search for a slash. |
---|
950 | $position = $this->search_string($expression, "|"); |
---|
951 | |
---|
952 | // Check whether a | was found. |
---|
953 | if ( $position >= 0 ) |
---|
954 | { |
---|
955 | // Get the left part of the expression. |
---|
956 | $left = substr($expression, 0, $position); |
---|
957 | $right = substr($expression, $position + 1); |
---|
958 | |
---|
959 | // Add the left value to the steps. |
---|
960 | $paths[] = $left; |
---|
961 | |
---|
962 | // Reduce the expression to the right part. |
---|
963 | $expression = $right; |
---|
964 | } |
---|
965 | } |
---|
966 | while ( $position > -1 ); |
---|
967 | |
---|
968 | // Add the remaing expression to the list of steps. |
---|
969 | $paths[] = $expression; |
---|
970 | |
---|
971 | // Return the steps. |
---|
972 | return $paths; |
---|
973 | } |
---|
974 | |
---|
975 | /** |
---|
976 | * Splits an XPath expression into its different steps. |
---|
977 | * |
---|
978 | * This method splits an XPath expression. Each expression can consists of |
---|
979 | * list of steps being separated from each other by a / character. |
---|
980 | * |
---|
981 | * @access private |
---|
982 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
983 | * @param string $expression The complete expression to be splitted |
---|
984 | * into its different steps. |
---|
985 | * @return array The array returned from this method contains a list |
---|
986 | * of all steps found in the expression passed to this |
---|
987 | * method as a parameter. |
---|
988 | * @see evalute() |
---|
989 | */ |
---|
990 | function split_steps ( $expression ) |
---|
991 | { |
---|
992 | // Create an empty array. |
---|
993 | $steps = array(); |
---|
994 | |
---|
995 | // Replace a double slashes, because they'll cause problems otherwise. |
---|
996 | $expression = str_replace("//@", "/descendant::*/@", $expression); |
---|
997 | $expression = str_replace("//", "/descendant::", $expression); |
---|
998 | |
---|
999 | // Save the position of the slash. |
---|
1000 | $position = -1; |
---|
1001 | |
---|
1002 | // Run through the expression. |
---|
1003 | do |
---|
1004 | { |
---|
1005 | // Search for a slash. |
---|
1006 | $position = $this->search_string($expression, "/"); |
---|
1007 | |
---|
1008 | // Check whether a slash was found. |
---|
1009 | if ( $position >= 0 ) |
---|
1010 | { |
---|
1011 | // Get the left part of the expression. |
---|
1012 | $left = substr($expression, 0, $position); |
---|
1013 | $right = substr($expression, $position + 1); |
---|
1014 | |
---|
1015 | // Add the left value to the steps. |
---|
1016 | $steps[] = $left; |
---|
1017 | |
---|
1018 | // Reduce the expression to the right part. |
---|
1019 | $expression = $right; |
---|
1020 | } |
---|
1021 | } |
---|
1022 | while ( $position > -1 ); |
---|
1023 | |
---|
1024 | // Add the remaing expression to the list of steps. |
---|
1025 | $steps[] = $expression; |
---|
1026 | |
---|
1027 | // Return the steps. |
---|
1028 | return $steps; |
---|
1029 | } |
---|
1030 | |
---|
1031 | /** |
---|
1032 | * Retrieves axis information from an XPath expression step. |
---|
1033 | * |
---|
1034 | * This method tries to extract the name of the axis and its node-test |
---|
1035 | * from a given step of an XPath expression at a given node. |
---|
1036 | * |
---|
1037 | * @access private |
---|
1038 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
1039 | * @param string $step String containing a step of an XPath expression. |
---|
1040 | * @param string $node Full document path of the node on which the |
---|
1041 | * step is executed. |
---|
1042 | * @return array This method returns an array containing information |
---|
1043 | * about the axis found in the step. |
---|
1044 | * @see evaluate_step() |
---|
1045 | */ |
---|
1046 | function get_axis ( $step, $node ) |
---|
1047 | { |
---|
1048 | // Create an array to save the axis information. |
---|
1049 | $axis = array( |
---|
1050 | "axis" => "", |
---|
1051 | "node-test" => "", |
---|
1052 | "predicate" => array() |
---|
1053 | ); |
---|
1054 | |
---|
1055 | // Check whether there are predicates. |
---|
1056 | if ( ereg("\[", $step) ) |
---|
1057 | { |
---|
1058 | // Get the predicates. |
---|
1059 | $predicates = substr($step, strpos($step, "[")); |
---|
1060 | |
---|
1061 | // Reduce the step. |
---|
1062 | $step = $this->prestr($step, "["); |
---|
1063 | |
---|
1064 | // Try to split the predicates. |
---|
1065 | $predicates = str_replace("][", "]|[", $predicates); |
---|
1066 | $predicates = explode("|", $predicates); |
---|
1067 | |
---|
1068 | // Run through all predicates. |
---|
1069 | foreach ( $predicates as $predicate ) |
---|
1070 | { |
---|
1071 | // Remove the brackets. |
---|
1072 | $predicate = substr($predicate, 1, strlen($predicate) - 2); |
---|
1073 | |
---|
1074 | // Add the predicate to the list of predicates. |
---|
1075 | $axis["predicate"][] = $predicate; |
---|
1076 | } |
---|
1077 | } |
---|
1078 | |
---|
1079 | // Check whether the axis is given in plain text. |
---|
1080 | if ( $this->search_string($step, "::") > -1 ) |
---|
1081 | { |
---|
1082 | // Split the step to extract axis and node-test. |
---|
1083 | $axis["axis"] = $this->prestr($step, "::"); |
---|
1084 | $axis["node-test"] = $this->afterstr($step, "::"); |
---|
1085 | } |
---|
1086 | else |
---|
1087 | { |
---|
1088 | // Check whether the step is empty. |
---|
1089 | if ( empty($step) ) |
---|
1090 | { |
---|
1091 | // Set it to the default value. |
---|
1092 | $step = "."; |
---|
1093 | } |
---|
1094 | |
---|
1095 | // Check whether is an abbreviated syntax. |
---|
1096 | if ( $step == "*" ) |
---|
1097 | { |
---|
1098 | // Use the child axis and select all children. |
---|
1099 | $axis["axis"] = "child"; |
---|
1100 | $axis["node-test"] = "*"; |
---|
1101 | } |
---|
1102 | elseif ( ereg("\(", $step) ) |
---|
1103 | { |
---|
1104 | // Check whether it's a function. |
---|
1105 | if ( $this->is_function($this->prestr($step, "(")) ) |
---|
1106 | { |
---|
1107 | // Get the position of the first bracket. |
---|
1108 | $start = strpos($step, "("); |
---|
1109 | $end = strpos($step, ")", $start); |
---|
1110 | |
---|
1111 | // Get everything before, between and after the brackets. |
---|
1112 | $before = substr($step, 0, $start); |
---|
1113 | $between = substr($step, $start + 1, $end - $start - 1); |
---|
1114 | $after = substr($step, $end + 1); |
---|
1115 | |
---|
1116 | // Trim each string. |
---|
1117 | $before = trim($before); |
---|
1118 | $between = trim($between); |
---|
1119 | $after = trim($after); |
---|
1120 | |
---|
1121 | // Save the evaluated function. |
---|
1122 | $axis["axis"] = "function"; |
---|
1123 | $axis["node-test"] = $this->evaluate_function($before, |
---|
1124 | $between, $node); |
---|
1125 | } |
---|
1126 | else |
---|
1127 | { |
---|
1128 | // Use the child axis and a function. |
---|
1129 | $axis["axis"] = "child"; |
---|
1130 | $axis["node-test"] = $step; |
---|
1131 | } |
---|
1132 | } |
---|
1133 | elseif ( eregi("^@", $step) ) |
---|
1134 | { |
---|
1135 | // Use the attribute axis and select the attribute. |
---|
1136 | $axis["axis"] = "attribute"; |
---|
1137 | $axis["node-test"] = substr($step, 1); |
---|
1138 | } |
---|
1139 | elseif ( eregi("\]$", $step) ) |
---|
1140 | { |
---|
1141 | // Use the child axis and select a position. |
---|
1142 | $axis["axis"] = "child"; |
---|
1143 | $axis["node-test"] = substr($step, strpos($step, "[")); |
---|
1144 | } |
---|
1145 | elseif ( $step == "." ) |
---|
1146 | { |
---|
1147 | // Select the self axis. |
---|
1148 | $axis["axis"] = "self"; |
---|
1149 | $axis["node-test"] = "*"; |
---|
1150 | } |
---|
1151 | elseif ( $step == ".." ) |
---|
1152 | { |
---|
1153 | // Select the parent axis. |
---|
1154 | $axis["axis"] = "parent"; |
---|
1155 | $axis["node-test"] = "*"; |
---|
1156 | } |
---|
1157 | elseif ( ereg("^[a-zA-Z0-9\-_]+$", $step) ) |
---|
1158 | { |
---|
1159 | // Select the child axis and the child. |
---|
1160 | $axis["axis"] = "child"; |
---|
1161 | $axis["node-test"] = $step; |
---|
1162 | } |
---|
1163 | else |
---|
1164 | { |
---|
1165 | // Use the child axis and a name. |
---|
1166 | $axis["axis"] = "child"; |
---|
1167 | $axis["node-test"] = $step; |
---|
1168 | } |
---|
1169 | } |
---|
1170 | |
---|
1171 | // Check whether it's a valid axis. |
---|
1172 | if ( !in_array($axis["axis"], array_merge($this->axes, |
---|
1173 | array("function"))) ) |
---|
1174 | { |
---|
1175 | // Display an error message. |
---|
1176 | $this->display_error("While parsing an XPath expression, in ". |
---|
1177 | "the step \"%s\" the invalid axis \"%s\" was found.", |
---|
1178 | str_replace($step, "<b>".$step."</b>", $this->xpath),# |
---|
1179 | $axis["axis"]); |
---|
1180 | } |
---|
1181 | |
---|
1182 | // Return the axis information. |
---|
1183 | return $axis; |
---|
1184 | } |
---|
1185 | |
---|
1186 | /** |
---|
1187 | * Looks for a string within another string. |
---|
1188 | * |
---|
1189 | * This method looks for a string within another string. Brackets in the |
---|
1190 | * string the method is looking through will be respected, which means that |
---|
1191 | * only if the string the method is looking for is located outside of |
---|
1192 | * brackets, the search will be successful. |
---|
1193 | * |
---|
1194 | * @access private |
---|
1195 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
1196 | * @param string $term String in which the search shall take place. |
---|
1197 | * @param string $expression String that should be searched. |
---|
1198 | * @return int This method returns -1 if no string was found, otherwise |
---|
1199 | * the offset at which the string was found. |
---|
1200 | * @see evaluate_step() |
---|
1201 | */ |
---|
1202 | function search_string ( $term, $expression ) |
---|
1203 | { |
---|
1204 | // Create a new counter for the brackets. |
---|
1205 | $brackets = 0; |
---|
1206 | |
---|
1207 | // Run through the string. |
---|
1208 | for ( $i = 0; $i < strlen($term); $i++ ) |
---|
1209 | { |
---|
1210 | // Get the character at the position of the string. |
---|
1211 | $character = substr($term, $i, 1); |
---|
1212 | |
---|
1213 | // Check whether it's a breacket. |
---|
1214 | if ( ( $character == "(" ) || ( $character == "[" ) ) |
---|
1215 | { |
---|
1216 | // Increase the number of brackets. |
---|
1217 | $brackets++; |
---|
1218 | } |
---|
1219 | elseif ( ( $character == ")" ) || ( $character == "]" ) ) |
---|
1220 | { |
---|
1221 | // Decrease the number of brackets. |
---|
1222 | $brackets--; |
---|
1223 | } |
---|
1224 | elseif ( $brackets == 0 ) |
---|
1225 | { |
---|
1226 | // Check whether we can find the expression at this index. |
---|
1227 | if ( substr($term, $i, strlen($expression)) == $expression ) |
---|
1228 | { |
---|
1229 | // Return the current index. |
---|
1230 | return $i; |
---|
1231 | } |
---|
1232 | } |
---|
1233 | } |
---|
1234 | |
---|
1235 | // Check whether we had a valid number of brackets. |
---|
1236 | if ( $brackets != 0 ) |
---|
1237 | { |
---|
1238 | // Display an error message. |
---|
1239 | $this->display_error("While parsing an XPath expression, in the ". |
---|
1240 | "predicate \"%s\", there was an invalid number of brackets.", |
---|
1241 | str_replace($term, "<b>".$term."</b>", $this->xpath)); |
---|
1242 | } |
---|
1243 | |
---|
1244 | // Nothing was found. |
---|
1245 | return (-1); |
---|
1246 | } |
---|
1247 | |
---|
1248 | /** |
---|
1249 | * Checks for a valid function name. |
---|
1250 | * |
---|
1251 | * This method check whether an expression contains a valid name of an |
---|
1252 | * XPath function. |
---|
1253 | * |
---|
1254 | * @access private |
---|
1255 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
1256 | * @param string $expression Name of the function to be checked. |
---|
1257 | * @return boolean This method returns true if the given name is a valid |
---|
1258 | * XPath function name, otherwise false. |
---|
1259 | * @see evaluate() |
---|
1260 | */ |
---|
1261 | function is_function ( $expression ) |
---|
1262 | { |
---|
1263 | // Check whether it's in the list of supported functions. |
---|
1264 | if ( in_array($expression, $this->functions) ) |
---|
1265 | { |
---|
1266 | // It's a function. |
---|
1267 | return true; |
---|
1268 | } |
---|
1269 | else |
---|
1270 | { |
---|
1271 | // It's not a function. |
---|
1272 | return false; |
---|
1273 | } |
---|
1274 | } |
---|
1275 | |
---|
1276 | /** |
---|
1277 | * Evaluates a step of an XPath expression. |
---|
1278 | * |
---|
1279 | * This method tries to evaluate a step from an XPath expression at a |
---|
1280 | * specific context. |
---|
1281 | * |
---|
1282 | * @access private |
---|
1283 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
1284 | * @param string $context Full document path of the context from |
---|
1285 | * which starting the step should be evaluated. |
---|
1286 | * @param array $steps Array containing the remaining steps of the |
---|
1287 | * current XPath expression. |
---|
1288 | * @return array This method returns an array containing all nodes |
---|
1289 | * that are the result of evaluating the given XPath step. |
---|
1290 | * @see evaluate() |
---|
1291 | */ |
---|
1292 | function evaluate_step ( $context, $steps ) |
---|
1293 | { |
---|
1294 | // Create an empty array for saving the nodes found. |
---|
1295 | $nodes = array(); |
---|
1296 | |
---|
1297 | // Check whether the context is an array of contexts. |
---|
1298 | if ( is_array($context) ) |
---|
1299 | { |
---|
1300 | // Run through the array. |
---|
1301 | foreach ( $context as $path ) |
---|
1302 | { |
---|
1303 | // Call this method for this single path. |
---|
1304 | $nodes = array_merge($nodes, |
---|
1305 | $this->evaluate_step($path, $steps)); |
---|
1306 | } |
---|
1307 | } |
---|
1308 | else |
---|
1309 | { |
---|
1310 | // Get this step. |
---|
1311 | $step = array_shift($steps); |
---|
1312 | |
---|
1313 | // Create an array to save the new contexts. |
---|
1314 | $contexts = array(); |
---|
1315 | |
---|
1316 | // Get the axis of the current step. |
---|
1317 | $axis = $this->get_axis($step, $context); |
---|
1318 | |
---|
1319 | // Check whether it's a function. |
---|
1320 | if ( $axis["axis"] == "function" ) |
---|
1321 | { |
---|
1322 | // Check whether an array was return by the function. |
---|
1323 | if ( is_array($axis["node-test"]) ) |
---|
1324 | { |
---|
1325 | // Add the results to the list of contexts. |
---|
1326 | $contexts = array_merge($contexts, $axis["node-test"]); |
---|
1327 | } |
---|
1328 | else |
---|
1329 | { |
---|
1330 | // Add the result to the list of contexts. |
---|
1331 | $contexts[] = $axis["node-test"]; |
---|
1332 | } |
---|
1333 | } |
---|
1334 | else |
---|
1335 | { |
---|
1336 | // Create the name of the method. |
---|
1337 | $method = "handle_axis_".str_replace("-", "_", $axis["axis"]); |
---|
1338 | |
---|
1339 | // Check whether the axis handler is defined. |
---|
1340 | if ( !method_exists(&$this, $method) ) |
---|
1341 | { |
---|
1342 | // Display an error message. |
---|
1343 | $this->display_error("While parsing an XPath expression, ". |
---|
1344 | "the axis \"%s\" could not be handled, because this ". |
---|
1345 | "version does not support this axis.", $axis["axis"]); |
---|
1346 | } |
---|
1347 | |
---|
1348 | // Perform an axis action. |
---|
1349 | $contexts = call_user_method($method, &$this, $axis, $context); |
---|
1350 | |
---|
1351 | // Check whether there are predicates. |
---|
1352 | if ( count($axis["predicate"]) > 0 ) |
---|
1353 | { |
---|
1354 | // Check whether each node fits the predicates. |
---|
1355 | $contexts = $this->check_predicates($contexts, |
---|
1356 | $axis["predicate"]); |
---|
1357 | } |
---|
1358 | } |
---|
1359 | |
---|
1360 | // Check whether there are more steps left. |
---|
1361 | if ( count($steps) > 0 ) |
---|
1362 | { |
---|
1363 | // Continue the evaluation of the next steps. |
---|
1364 | $nodes = $this->evaluate_step($contexts, $steps); |
---|
1365 | } |
---|
1366 | else |
---|
1367 | { |
---|
1368 | // Save the found contexts. |
---|
1369 | $nodes = $contexts; |
---|
1370 | } |
---|
1371 | } |
---|
1372 | |
---|
1373 | // Return the nodes found. |
---|
1374 | return $nodes; |
---|
1375 | } |
---|
1376 | |
---|
1377 | /** |
---|
1378 | * Evaluates an XPath function |
---|
1379 | * |
---|
1380 | * This method evaluates a given XPath function with its arguments on a |
---|
1381 | * specific node of the document. |
---|
1382 | * |
---|
1383 | * @access private |
---|
1384 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
1385 | * @param string $function Name of the function to be evaluated. |
---|
1386 | * @param string $arguments String containing the arguments being |
---|
1387 | * passed to the function. |
---|
1388 | * @param string $node Full path to the document node on which the |
---|
1389 | * function should be evaluated. |
---|
1390 | * @return mixed This method returns the result of the evaluation of |
---|
1391 | * the function. Depending on the function the type of the |
---|
1392 | * return value can be different. |
---|
1393 | * @see evaluate() |
---|
1394 | */ |
---|
1395 | function evaluate_function ( $function, $arguments, $node ) |
---|
1396 | { |
---|
1397 | // Remove whitespaces. |
---|
1398 | $function = trim($function); |
---|
1399 | $arguments = trim($arguments); |
---|
1400 | |
---|
1401 | // Create the name of the function handling function. |
---|
1402 | $method = "handle_function_".str_replace("-", "_", $function); |
---|
1403 | |
---|
1404 | // Check whether the function handling function is available. |
---|
1405 | if ( !method_exists(&$this, $method) ) |
---|
1406 | { |
---|
1407 | // Display an error message. |
---|
1408 | $this->display_error("While parsing an XPath expression, ". |
---|
1409 | "the function \"%s\" could not be handled, because this ". |
---|
1410 | "version does not support this function.", $function); |
---|
1411 | } |
---|
1412 | |
---|
1413 | // Return the result of the function. |
---|
1414 | return call_user_method($method, &$this, $node, $arguments); |
---|
1415 | } |
---|
1416 | |
---|
1417 | /** |
---|
1418 | * Evaluates a predicate on a node. |
---|
1419 | * |
---|
1420 | * This method tries to evaluate a predicate on a given node. |
---|
1421 | * |
---|
1422 | * @access private |
---|
1423 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
1424 | * @param string $node Full path of the node on which the predicate |
---|
1425 | * should be evaluated. |
---|
1426 | * @param string $predicate String containing the predicate expression |
---|
1427 | * to be evaluated. |
---|
1428 | * @return mixed This method is called recursively. The first call should |
---|
1429 | * return a boolean value, whether the node matches the predicate |
---|
1430 | * or not. Any call to the method being made during the recursion |
---|
1431 | * may also return other types for further processing. |
---|
1432 | * @see evaluate() |
---|
1433 | */ |
---|
1434 | function evaluate_predicate ( $node, $predicate ) |
---|
1435 | { |
---|
1436 | // Set the default position and the type of the operator. |
---|
1437 | $position = 0; |
---|
1438 | $operator = ""; |
---|
1439 | |
---|
1440 | // Run through all operators and try to find them. |
---|
1441 | foreach ( $this->operators as $expression ) |
---|
1442 | { |
---|
1443 | // Check whether a position was already found. |
---|
1444 | if ( $position <= 0 ) |
---|
1445 | { |
---|
1446 | // Try to find the operator. |
---|
1447 | $position = $this->search_string($predicate, $expression); |
---|
1448 | |
---|
1449 | // Check whether a operator was found. |
---|
1450 | if ( $position > 0 ) |
---|
1451 | { |
---|
1452 | // Save the operator. |
---|
1453 | $operator = $expression; |
---|
1454 | |
---|
1455 | // Check whether it's the equal operator. |
---|
1456 | if ( $operator == "=" ) |
---|
1457 | { |
---|
1458 | // Also look for other operators containing the |
---|
1459 | // equal sign. |
---|
1460 | if ( $this->search_string($predicate, "!=") == |
---|
1461 | ( $position - 1 ) ) |
---|
1462 | { |
---|
1463 | // Get the new position. |
---|
1464 | $position = $this->search_string($predicate, "!="); |
---|
1465 | |
---|
1466 | // Save the new operator. |
---|
1467 | $operator = "!="; |
---|
1468 | } |
---|
1469 | if ( $this->search_string($predicate, "<=") == |
---|
1470 | ( $position - 1 ) ) |
---|
1471 | { |
---|
1472 | // Get the new position. |
---|
1473 | $position = $this->search_string($predicate, "<="); |
---|
1474 | |
---|
1475 | // Save the new operator. |
---|
1476 | $operator = "<="; |
---|
1477 | } |
---|
1478 | if ( $this->search_string($predicate, ">=") == |
---|
1479 | ( $position - 1 ) ) |
---|
1480 | { |
---|
1481 | // Get the new position. |
---|
1482 | $position = $this->search_string($predicate, ">="); |
---|
1483 | |
---|
1484 | // Save the new operator. |
---|
1485 | $operator = ">="; |
---|
1486 | } |
---|
1487 | } |
---|
1488 | } |
---|
1489 | } |
---|
1490 | } |
---|
1491 | |
---|
1492 | // Check whether the operator is a - sign. |
---|
1493 | if ( $operator == "-" ) |
---|
1494 | { |
---|
1495 | // Check whether it's not a function containing a - in its name. |
---|
1496 | foreach ( $this->functions as $function ) |
---|
1497 | { |
---|
1498 | // Check whether there's a - sign in the function name. |
---|
1499 | if ( ereg("-", $function) ) |
---|
1500 | { |
---|
1501 | // Get the position of the - in the function name. |
---|
1502 | $sign = strpos($function, "-"); |
---|
1503 | |
---|
1504 | // Extract a substring from the predicate. |
---|
1505 | $sub = substr($predicate, $position - $sign, |
---|
1506 | strlen($function)); |
---|
1507 | |
---|
1508 | // Check whether it's the function. |
---|
1509 | if ( $sub == $function ) |
---|
1510 | { |
---|
1511 | // Don't use the operator. |
---|
1512 | $operator = ""; |
---|
1513 | $position = -1; |
---|
1514 | } |
---|
1515 | } |
---|
1516 | } |
---|
1517 | } |
---|
1518 | elseif ( $operator == "*" ) |
---|
1519 | { |
---|
1520 | // Get some substrings. |
---|
1521 | $character = substr($predicate, $position - 1, 1); |
---|
1522 | $attribute = substr($predicate, $position - 11, 11); |
---|
1523 | |
---|
1524 | // Check whether it's an attribute selection. |
---|
1525 | if ( ( $character == "@" ) || ( $attribute == "attribute::" ) ) |
---|
1526 | { |
---|
1527 | // Don't use the operator. |
---|
1528 | $operator = ""; |
---|
1529 | $position = -1; |
---|
1530 | } |
---|
1531 | } |
---|
1532 | |
---|
1533 | // Check whether an operator was found. |
---|
1534 | if ( $position > 0 ) |
---|
1535 | { |
---|
1536 | // Get the left and the right part of the expression. |
---|
1537 | $left = substr($predicate, 0, $position); |
---|
1538 | $right = substr($predicate, $position + strlen($operator)); |
---|
1539 | |
---|
1540 | // Remove whitespaces. |
---|
1541 | $left = trim($left); |
---|
1542 | $right = trim($right); |
---|
1543 | |
---|
1544 | // Evaluate the left and the right part. |
---|
1545 | $left = $this->evaluate_predicate($node, $left); |
---|
1546 | $right = $this->evaluate_predicate($node, $right); |
---|
1547 | |
---|
1548 | // Check the kind of operator. |
---|
1549 | switch ( $operator ) |
---|
1550 | { |
---|
1551 | case " or ": |
---|
1552 | // Return the two results connected by an "or". |
---|
1553 | return ( $left or $right ); |
---|
1554 | |
---|
1555 | case " and ": |
---|
1556 | // Return the two results connected by an "and". |
---|
1557 | return ( $left and $right ); |
---|
1558 | |
---|
1559 | case "=": |
---|
1560 | // Compare the two results. |
---|
1561 | return ( $left == $right ); |
---|
1562 | |
---|
1563 | case "!=": |
---|
1564 | // Check whether the two results are not equal. |
---|
1565 | return ( $left != $right ); |
---|
1566 | |
---|
1567 | case "<=": |
---|
1568 | // Compare the two results. |
---|
1569 | return ( $left <= $right ); |
---|
1570 | |
---|
1571 | case "<": |
---|
1572 | // Compare the two results. |
---|
1573 | return ( $left < $right ); |
---|
1574 | |
---|
1575 | case ">=": |
---|
1576 | // Compare the two results. |
---|
1577 | return ( $left >= $right ); |
---|
1578 | |
---|
1579 | case ">": |
---|
1580 | // Compare the two results. |
---|
1581 | return ( $left > $right ); |
---|
1582 | |
---|
1583 | case "+": |
---|
1584 | // Return the result by adding one result to the other. |
---|
1585 | return ( $left + $right ); |
---|
1586 | |
---|
1587 | case "-": |
---|
1588 | // Return the result by decrease one result by the other. |
---|
1589 | return ( $left - $right ); |
---|
1590 | |
---|
1591 | case "*": |
---|
1592 | // Return a multiplication of the two results. |
---|
1593 | return ( $left * $right ); |
---|
1594 | |
---|
1595 | case " div ": |
---|
1596 | // Return a division of the two results. |
---|
1597 | if ( $right == 0 ) |
---|
1598 | { |
---|
1599 | // Display an error message. |
---|
1600 | $this->display_error("While parsing an XPath ". |
---|
1601 | "predicate, a error due a division by zero ". |
---|
1602 | "occured."); |
---|
1603 | } |
---|
1604 | else |
---|
1605 | { |
---|
1606 | // Return the result of the division. |
---|
1607 | return ( $left / $right ); |
---|
1608 | } |
---|
1609 | break; |
---|
1610 | |
---|
1611 | case " mod ": |
---|
1612 | // Return a modulo of the two results. |
---|
1613 | return ( $left % $right ); |
---|
1614 | } |
---|
1615 | } |
---|
1616 | |
---|
1617 | // Check whether the predicate is a function. |
---|
1618 | if ( ereg("\(", $predicate) ) |
---|
1619 | { |
---|
1620 | // Get the position of the first bracket. |
---|
1621 | $start = strpos($predicate, "("); |
---|
1622 | $end = strpos($predicate, ")", $start); |
---|
1623 | |
---|
1624 | // Get everything before, between and after the brackets. |
---|
1625 | $before = substr($predicate, 0, $start); |
---|
1626 | $between = substr($predicate, $start + 1, $end - $start - 1); |
---|
1627 | $after = substr($predicate, $end + 1); |
---|
1628 | |
---|
1629 | // Trim each string. |
---|
1630 | $before = trim($before); |
---|
1631 | $between = trim($between); |
---|
1632 | $after = trim($after); |
---|
1633 | |
---|
1634 | // Check whether there's something after the bracket. |
---|
1635 | if ( !empty($after) ) |
---|
1636 | { |
---|
1637 | // Display an error message. |
---|
1638 | $this->display_error("While parsing an XPath expression ". |
---|
1639 | "there was found an error in the predicate \"%s\", ". |
---|
1640 | "because after a closing bracket there was found ". |
---|
1641 | "something unknown.", str_replace($predicate, |
---|
1642 | "<b>".$predicate."</b>", $this->xpath)); |
---|
1643 | } |
---|
1644 | |
---|
1645 | // Check whether it's a function. |
---|
1646 | if ( empty($before) && empty($after) ) |
---|
1647 | { |
---|
1648 | // Evaluate the content of the brackets. |
---|
1649 | return $this->evaluate_predicate($node, $between); |
---|
1650 | } |
---|
1651 | elseif ( $this->is_function($before) ) |
---|
1652 | { |
---|
1653 | // Return the evaluated function. |
---|
1654 | return $this->evaluate_function($before, $between, $node); |
---|
1655 | } |
---|
1656 | else |
---|
1657 | { |
---|
1658 | // Display an error message. |
---|
1659 | $this->display_error("While parsing a predicate in an XPath ". |
---|
1660 | "expression, a function \"%s\" was found, which is not ". |
---|
1661 | "yet supported by the parser.", str_replace($before, |
---|
1662 | "<b>".$before."</b>", $this->xpath)); |
---|
1663 | } |
---|
1664 | } |
---|
1665 | |
---|
1666 | // Check whether the predicate is just a digit. |
---|
1667 | if ( ereg("^[0-9]+(\.[0-9]+)?$", $predicate) || |
---|
1668 | ereg("^\.[0-9]+$", $predicate) ) |
---|
1669 | { |
---|
1670 | // Return the value of the digit. |
---|
1671 | return doubleval($predicate); |
---|
1672 | } |
---|
1673 | |
---|
1674 | // Check whether it's an XPath expression. |
---|
1675 | $result = $this->evaluate($predicate, $node); |
---|
1676 | if ( count($result) > 0 ) |
---|
1677 | { |
---|
1678 | // Convert the array. |
---|
1679 | $result = explode("|", implode("|", $result)); |
---|
1680 | |
---|
1681 | // Get the value of the first result. |
---|
1682 | $value = $this->get_content($result[0]); |
---|
1683 | |
---|
1684 | // Return the value. |
---|
1685 | return $value; |
---|
1686 | } |
---|
1687 | |
---|
1688 | // Return the predicate as a string. |
---|
1689 | return $predicate; |
---|
1690 | } |
---|
1691 | |
---|
1692 | /** |
---|
1693 | * Checks whether a node matches predicates. |
---|
1694 | * |
---|
1695 | * This method checks whether a list of nodes passed to this method match |
---|
1696 | * a given list of predicates. |
---|
1697 | * |
---|
1698 | * @access private |
---|
1699 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
1700 | * @param array $nodes Array of full paths of all nodes to be tested. |
---|
1701 | * @param array $predicates Array of predicates to use. |
---|
1702 | * @return array The array returned by this method contains a list of |
---|
1703 | * all nodes matching the given predicates. |
---|
1704 | * @see evaluate_step() |
---|
1705 | */ |
---|
1706 | function check_predicates ( $nodes, $predicates ) |
---|
1707 | { |
---|
1708 | // Create an empty set of nodes. |
---|
1709 | $result = array(); |
---|
1710 | |
---|
1711 | // Run through all nodes. |
---|
1712 | foreach ( $nodes as $node ) |
---|
1713 | { |
---|
1714 | // Create a variable whether to add this node to the node-set. |
---|
1715 | $add = true; |
---|
1716 | |
---|
1717 | // Run through all predicates. |
---|
1718 | foreach ( $predicates as $predicate ) |
---|
1719 | { |
---|
1720 | // Check whether the predicate is just an number. |
---|
1721 | if ( ereg("^[0-9]+$", $predicate) ) |
---|
1722 | { |
---|
1723 | // Enhance the predicate. |
---|
1724 | $predicate .= "=position()"; |
---|
1725 | } |
---|
1726 | |
---|
1727 | // Do the predicate check. |
---|
1728 | $check = $this->evaluate_predicate($node, $predicate); |
---|
1729 | |
---|
1730 | // Check whether it's a string. |
---|
1731 | if ( is_string($check) && ( ( $check == "" ) || |
---|
1732 | ( $check == $predicate ) ) ) |
---|
1733 | { |
---|
1734 | // Set the result to false. |
---|
1735 | $check = false; |
---|
1736 | } |
---|
1737 | |
---|
1738 | // Check whether it's an integer. |
---|
1739 | if ( is_int($check) ) |
---|
1740 | { |
---|
1741 | // Check whether it's the current position. |
---|
1742 | if ( $check == $this->handle_function_position($node, "") ) |
---|
1743 | { |
---|
1744 | // Set it to true. |
---|
1745 | $check = true; |
---|
1746 | } |
---|
1747 | else |
---|
1748 | { |
---|
1749 | // Set it to false. |
---|
1750 | $check = false; |
---|
1751 | } |
---|
1752 | } |
---|
1753 | |
---|
1754 | // Check whether the predicate is OK for this node. |
---|
1755 | $add = $add && $check; |
---|
1756 | } |
---|
1757 | |
---|
1758 | // Check whether to add this node to the node-set. |
---|
1759 | if ( $add ) |
---|
1760 | { |
---|
1761 | // Add the node to the node-set. |
---|
1762 | $result[] = $node; |
---|
1763 | } |
---|
1764 | } |
---|
1765 | |
---|
1766 | // Return the array of nodes. |
---|
1767 | return $result; |
---|
1768 | } |
---|
1769 | |
---|
1770 | /** |
---|
1771 | * Checks whether a node matches a node-test. |
---|
1772 | * |
---|
1773 | * This method checks whether a node in the document matches a given |
---|
1774 | * node-test. |
---|
1775 | * |
---|
1776 | * @access private |
---|
1777 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
1778 | * @param string $context Full path of the node, which should be tested |
---|
1779 | * for matching the node-test. |
---|
1780 | * @param string $node_test String containing the node-test for the |
---|
1781 | * node. |
---|
1782 | * @return boolean This method returns true if the node matches the |
---|
1783 | * node-test, otherwise false. |
---|
1784 | * @see evaluate() |
---|
1785 | */ |
---|
1786 | function check_node_test ( $context, $node_test ) |
---|
1787 | { |
---|
1788 | // Check whether it's a function. |
---|
1789 | if ( ereg("\(", $node_test) ) |
---|
1790 | { |
---|
1791 | // Get the type of function to use. |
---|
1792 | $function = $this->prestr($node_test, "("); |
---|
1793 | |
---|
1794 | // Check whether the node fits the method. |
---|
1795 | switch ( $function ) |
---|
1796 | { |
---|
1797 | case "node": |
---|
1798 | // Add this node to the list of nodes. |
---|
1799 | return true; |
---|
1800 | |
---|
1801 | case "text": |
---|
1802 | // Check whether the node has some text. |
---|
1803 | if ( !empty($this->nodes[$context]["text"]) ) |
---|
1804 | { |
---|
1805 | // Add this node to the list of nodes. |
---|
1806 | return true; |
---|
1807 | } |
---|
1808 | break; |
---|
1809 | |
---|
1810 | case "comment": |
---|
1811 | // Check whether the node has some comment. |
---|
1812 | if ( !empty($this->nodes[$context]["comment"]) ) |
---|
1813 | { |
---|
1814 | // Add this node to the list of nodes. |
---|
1815 | return true; |
---|
1816 | } |
---|
1817 | break; |
---|
1818 | |
---|
1819 | case "processing-instruction": |
---|
1820 | // Get the literal argument. |
---|
1821 | $literal = $this->afterstr($axis["node-test"], "("); |
---|
1822 | |
---|
1823 | // Cut the literal. |
---|
1824 | $literal = substr($literal, 0, strlen($literal) - 1); |
---|
1825 | |
---|
1826 | // Check whether a literal was given. |
---|
1827 | if ( !empty($literal) ) |
---|
1828 | { |
---|
1829 | // Check whether the node's processing instructions |
---|
1830 | // are matching the literals given. |
---|
1831 | if ( $this->nodes[$context] |
---|
1832 | ["processing-instructions"] == $literal ) |
---|
1833 | { |
---|
1834 | // Add this node to the node-set. |
---|
1835 | return true; |
---|
1836 | } |
---|
1837 | } |
---|
1838 | else |
---|
1839 | { |
---|
1840 | // Check whether the node has processing |
---|
1841 | // instructions. |
---|
1842 | if ( !empty($this->nodes[$context] |
---|
1843 | ["processing-instructions"]) ) |
---|
1844 | { |
---|
1845 | // Add this node to the node-set. |
---|
1846 | return true; |
---|
1847 | } |
---|
1848 | } |
---|
1849 | break; |
---|
1850 | |
---|
1851 | default: |
---|
1852 | // Display an error message. |
---|
1853 | $this->display_error("While parsing an XPath ". |
---|
1854 | "expression there was found an undefined ". |
---|
1855 | "function called \"%s\".", |
---|
1856 | str_replace($function, "<b>".$function."</b>", |
---|
1857 | $this->xpath)); |
---|
1858 | } |
---|
1859 | } |
---|
1860 | elseif ( $node_test == "*" ) |
---|
1861 | { |
---|
1862 | // Add this node to the node-set. |
---|
1863 | return true; |
---|
1864 | } |
---|
1865 | elseif ( ereg("^[a-zA-Z0-9\-_]+", $node_test) ) |
---|
1866 | { |
---|
1867 | // Check whether the node-test can be fulfilled. |
---|
1868 | if ( $this->nodes[$context]["name"] == $node_test ) |
---|
1869 | { |
---|
1870 | // Add this node to the node-set. |
---|
1871 | return true; |
---|
1872 | } |
---|
1873 | } |
---|
1874 | else |
---|
1875 | { |
---|
1876 | // Display an error message. |
---|
1877 | $this->display_error("While parsing the XPath expression \"%s\" ". |
---|
1878 | "an empty and therefore invalid node-test has been found.", |
---|
1879 | $this->xpath); |
---|
1880 | } |
---|
1881 | |
---|
1882 | // Don't add this context. |
---|
1883 | return false; |
---|
1884 | } |
---|
1885 | |
---|
1886 | /** |
---|
1887 | * Handles the XPath child axis. |
---|
1888 | * |
---|
1889 | * This method handles the XPath child axis. |
---|
1890 | * |
---|
1891 | * @access private |
---|
1892 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
1893 | * @param array $axis Array containing information about the axis. |
---|
1894 | * @param string $context Node from which starting the axis should |
---|
1895 | * be processed. |
---|
1896 | * @return array This method returns an array containing all nodes |
---|
1897 | * that were found during the evaluation of the given axis. |
---|
1898 | * @see evaluate() |
---|
1899 | */ |
---|
1900 | function handle_axis_child ( $axis, $context ) |
---|
1901 | { |
---|
1902 | // Create an empty node-set. |
---|
1903 | $nodes = array(); |
---|
1904 | |
---|
1905 | // Get a list of all children. |
---|
1906 | $children = $this->nodes[$context]["children"]; |
---|
1907 | |
---|
1908 | // Check whether there are children. |
---|
1909 | if ( !empty($children) ) |
---|
1910 | { |
---|
1911 | // Run through all children. |
---|
1912 | foreach ( $children as $child_name => $child_position ) |
---|
1913 | { |
---|
1914 | // Run through all childs with this name. |
---|
1915 | for ( $i = 1; $i <= $child_position; $i++ ) |
---|
1916 | { |
---|
1917 | // Create the path of the child. |
---|
1918 | $child = $context."/".$child_name."[".$i."]"; |
---|
1919 | |
---|
1920 | // Check whether |
---|
1921 | if ( $this->check_node_test($child, $axis["node-test"]) ) |
---|
1922 | { |
---|
1923 | // Add the child to the node-set. |
---|
1924 | $nodes[] = $child; |
---|
1925 | } |
---|
1926 | } |
---|
1927 | } |
---|
1928 | } |
---|
1929 | |
---|
1930 | // Return the nodeset. |
---|
1931 | return $nodes; |
---|
1932 | } |
---|
1933 | |
---|
1934 | /** |
---|
1935 | * Handles the XPath parent axis. |
---|
1936 | * |
---|
1937 | * This method handles the XPath parent axis. |
---|
1938 | * |
---|
1939 | * @access private |
---|
1940 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
1941 | * @param array $axis Array containing information about the axis. |
---|
1942 | * @param string $context Node from which starting the axis should |
---|
1943 | * be processed. |
---|
1944 | * @return array This method returns an array containing all nodes |
---|
1945 | * that were found during the evaluation of the given axis. |
---|
1946 | * @see evaluate() |
---|
1947 | */ |
---|
1948 | function handle_axis_parent ( $axis, $context ) |
---|
1949 | { |
---|
1950 | // Create an empty node-set. |
---|
1951 | $nodes = array(); |
---|
1952 | |
---|
1953 | // Check whether the parent matches the node-test. |
---|
1954 | if ( $this->check_node_test($this->nodes[$context]["parent"], |
---|
1955 | $axis["node-test"]) ) |
---|
1956 | { |
---|
1957 | // Add this node to the list of nodes. |
---|
1958 | $nodes[] = $this->nodes[$context]["parent"]; |
---|
1959 | } |
---|
1960 | |
---|
1961 | // Return the nodeset. |
---|
1962 | return $nodes; |
---|
1963 | } |
---|
1964 | |
---|
1965 | /** |
---|
1966 | * Handles the XPath attribute axis. |
---|
1967 | * |
---|
1968 | * This method handles the XPath attribute axis. |
---|
1969 | * |
---|
1970 | * @access private |
---|
1971 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
1972 | * @param array $axis Array containing information about the axis. |
---|
1973 | * @param string $context Node from which starting the axis should |
---|
1974 | * be processed. |
---|
1975 | * @return array This method returns an array containing all nodes |
---|
1976 | * that were found during the evaluation of the given axis. |
---|
1977 | * @see evaluate() |
---|
1978 | */ |
---|
1979 | function handle_axis_attribute ( $axis, $context ) |
---|
1980 | { |
---|
1981 | // Create an empty node-set. |
---|
1982 | $nodes = array(); |
---|
1983 | |
---|
1984 | // Check whether all nodes should be selected. |
---|
1985 | if ( $axis["node-test"] == "*" ) |
---|
1986 | { |
---|
1987 | // Check whether there are attributes. |
---|
1988 | if ( count($this->nodes[$context]["attributes"]) > 0 ) |
---|
1989 | { |
---|
1990 | // Run through the attributes. |
---|
1991 | foreach ( $this->nodes[$context]["attributes"] as |
---|
1992 | $key => $value ) |
---|
1993 | { |
---|
1994 | // Add this node to the node-set. |
---|
1995 | $nodes[] = $context."/attribute::".$key; |
---|
1996 | } |
---|
1997 | } |
---|
1998 | } |
---|
1999 | elseif ( !empty($this->nodes[$context]["attributes"] |
---|
2000 | [$axis["node-test"]]) ) |
---|
2001 | { |
---|
2002 | // Add this node to the node-set. |
---|
2003 | $nodes[] = $context."/attribute::".$axis["node-test"]; |
---|
2004 | } |
---|
2005 | |
---|
2006 | // Return the nodeset. |
---|
2007 | return $nodes; |
---|
2008 | } |
---|
2009 | |
---|
2010 | /** |
---|
2011 | * Handles the XPath self axis. |
---|
2012 | * |
---|
2013 | * This method handles the XPath self axis. |
---|
2014 | * |
---|
2015 | * @access private |
---|
2016 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
2017 | * @param array $axis Array containing information about the axis. |
---|
2018 | * @param string $context Node from which starting the axis should |
---|
2019 | * be processed. |
---|
2020 | * @return array This method returns an array containing all nodes |
---|
2021 | * that were found during the evaluation of the given axis. |
---|
2022 | * @see evaluate() |
---|
2023 | */ |
---|
2024 | function handle_axis_self ( $axis, $context ) |
---|
2025 | { |
---|
2026 | // Create an empty node-set. |
---|
2027 | $nodes = array(); |
---|
2028 | |
---|
2029 | // Check whether the context match the node-test. |
---|
2030 | if ( $this->check_node_test($context, $axis["node-test"]) ) |
---|
2031 | { |
---|
2032 | // Add this node to the node-set. |
---|
2033 | $nodes[] = $context; |
---|
2034 | } |
---|
2035 | |
---|
2036 | // Return the nodeset. |
---|
2037 | return $nodes; |
---|
2038 | } |
---|
2039 | |
---|
2040 | /** |
---|
2041 | * Handles the XPath descendant axis. |
---|
2042 | * |
---|
2043 | * This method handles the XPath descendant axis. |
---|
2044 | * |
---|
2045 | * @access private |
---|
2046 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
2047 | * @param array $axis Array containing information about the axis. |
---|
2048 | * @param string $context Node from which starting the axis should |
---|
2049 | * be processed. |
---|
2050 | * @return array This method returns an array containing all nodes |
---|
2051 | * that were found during the evaluation of the given axis. |
---|
2052 | * @see evaluate() |
---|
2053 | */ |
---|
2054 | function handle_axis_descendant ( $axis, $context ) |
---|
2055 | { |
---|
2056 | // Create an empty node-set. |
---|
2057 | $nodes = array(); |
---|
2058 | |
---|
2059 | // Check whether the current node has children. |
---|
2060 | if ( count($this->nodes[$context]["children"]) > 0 ) |
---|
2061 | { |
---|
2062 | // Get a list of children. |
---|
2063 | $children = $this->nodes[$context]["children"]; |
---|
2064 | |
---|
2065 | // Run through all children. |
---|
2066 | foreach ( $children as $child_name => $child_position ) |
---|
2067 | { |
---|
2068 | // Run through all children of this name. |
---|
2069 | for ( $i = 1; $i <= $child_position; $i++ ) |
---|
2070 | { |
---|
2071 | // Create the full path for the children. |
---|
2072 | $child = $context."/".$child_name."[".$i."]"; |
---|
2073 | |
---|
2074 | // Check whether the child matches the node-test. |
---|
2075 | if ( $this->check_node_test($child, $axis["node-test"]) ) |
---|
2076 | { |
---|
2077 | // Add the child to the list of nodes. |
---|
2078 | $nodes[] = $child; |
---|
2079 | } |
---|
2080 | |
---|
2081 | // Recurse to the next level. |
---|
2082 | $nodes = array_merge($nodes, |
---|
2083 | $this->handle_axis_descendant($axis, $child)); |
---|
2084 | } |
---|
2085 | } |
---|
2086 | } |
---|
2087 | |
---|
2088 | // Return the nodeset. |
---|
2089 | return $nodes; |
---|
2090 | } |
---|
2091 | |
---|
2092 | /** |
---|
2093 | * Handles the XPath ancestor axis. |
---|
2094 | * |
---|
2095 | * This method handles the XPath ancestor axis. |
---|
2096 | * |
---|
2097 | * @access private |
---|
2098 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
2099 | * @param array $axis Array containing information about the axis. |
---|
2100 | * @param string $context Node from which starting the axis should |
---|
2101 | * be processed. |
---|
2102 | * @return array This method returns an array containing all nodes |
---|
2103 | * that were found during the evaluation of the given axis. |
---|
2104 | * @see evaluate() |
---|
2105 | */ |
---|
2106 | function handle_axis_ancestor ( $axis, $context ) |
---|
2107 | { |
---|
2108 | // Create an empty node-set. |
---|
2109 | $nodes = array(); |
---|
2110 | |
---|
2111 | // Get the parent of the current node. |
---|
2112 | $parent = $this->nodes[$context]["parent"]; |
---|
2113 | |
---|
2114 | // Check whether the parent isn't empty. |
---|
2115 | if ( !empty($parent) ) |
---|
2116 | { |
---|
2117 | // Check whether the parent matches the node-test. |
---|
2118 | if ( $this->check_node_test($parent, $axis["node-test"]) ) |
---|
2119 | { |
---|
2120 | // Add the parent to the list of nodes. |
---|
2121 | $nodes[] = $parent; |
---|
2122 | } |
---|
2123 | |
---|
2124 | // Handle all other ancestors. |
---|
2125 | $nodes = array_merge($nodes, |
---|
2126 | $this->handle_axis_ancestor($axis, $parent)); |
---|
2127 | } |
---|
2128 | |
---|
2129 | // Return the nodeset. |
---|
2130 | return $nodes; |
---|
2131 | } |
---|
2132 | |
---|
2133 | /** |
---|
2134 | * Handles the XPath namespace axis. |
---|
2135 | * |
---|
2136 | * This method handles the XPath namespace axis. |
---|
2137 | * |
---|
2138 | * @access private |
---|
2139 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
2140 | * @param array $axis Array containing information about the axis. |
---|
2141 | * @param string $context Node from which starting the axis should |
---|
2142 | * be processed. |
---|
2143 | * @return array This method returns an array containing all nodes |
---|
2144 | * that were found during the evaluation of the given axis. |
---|
2145 | * @see evaluate() |
---|
2146 | */ |
---|
2147 | function handle_axis_namespace ( $axis, $context ) |
---|
2148 | { |
---|
2149 | // Create an empty node-set. |
---|
2150 | $nodes = array(); |
---|
2151 | |
---|
2152 | // Check whether all nodes should be selected. |
---|
2153 | if ( !empty($this->nodes[$context]["namespace"]) ) |
---|
2154 | { |
---|
2155 | // Add this node to the node-set. |
---|
2156 | $nodes[] = $context; |
---|
2157 | } |
---|
2158 | |
---|
2159 | // Return the nodeset. |
---|
2160 | return $nodes; |
---|
2161 | } |
---|
2162 | |
---|
2163 | /** |
---|
2164 | * Handles the XPath following axis. |
---|
2165 | * |
---|
2166 | * This method handles the XPath following axis. |
---|
2167 | * |
---|
2168 | * @access private |
---|
2169 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
2170 | * @param array $axis Array containing information about the axis. |
---|
2171 | * @param string $context Node from which starting the axis should |
---|
2172 | * be processed. |
---|
2173 | * @return array This method returns an array containing all nodes |
---|
2174 | * that were found during the evaluation of the given axis. |
---|
2175 | * @see evaluate() |
---|
2176 | */ |
---|
2177 | function handle_axis_following ( $axis, $context ) |
---|
2178 | { |
---|
2179 | // Create an empty node-set. |
---|
2180 | $nodes = array(); |
---|
2181 | |
---|
2182 | // Get the current document position. |
---|
2183 | $position = $this->nodes[$context]["document-position"]; |
---|
2184 | |
---|
2185 | // Create a flag, whether we already found the context node. |
---|
2186 | $found = false; |
---|
2187 | |
---|
2188 | // Run through all nodes of the document. |
---|
2189 | foreach ( $this->nodes as $node => $data ) |
---|
2190 | { |
---|
2191 | // Check whether the context node has already been found. |
---|
2192 | if ( $found ) |
---|
2193 | { |
---|
2194 | // Check whether the position is correct. |
---|
2195 | if ( $this->nodes[$node]["document-position"] == $position ) |
---|
2196 | { |
---|
2197 | // Check whether the node fits the node-test. |
---|
2198 | if ( $this->check_node_test($node, $axis["node-test"]) ) |
---|
2199 | { |
---|
2200 | // Add the node to the list of nodes. |
---|
2201 | $nodes[] = $node; |
---|
2202 | } |
---|
2203 | } |
---|
2204 | } |
---|
2205 | |
---|
2206 | // Check whether this is the context node. |
---|
2207 | if ( $node == $context ) |
---|
2208 | { |
---|
2209 | // After this we'll look for more nodes. |
---|
2210 | $found = true; |
---|
2211 | } |
---|
2212 | } |
---|
2213 | |
---|
2214 | // Return the nodeset. |
---|
2215 | return $nodes; |
---|
2216 | } |
---|
2217 | |
---|
2218 | /** |
---|
2219 | * Handles the XPath preceding axis. |
---|
2220 | * |
---|
2221 | * This method handles the XPath preceding axis. |
---|
2222 | * |
---|
2223 | * @access private |
---|
2224 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
2225 | * @param array $axis Array containing information about the axis. |
---|
2226 | * @param string $context Node from which starting the axis should |
---|
2227 | * be processed. |
---|
2228 | * @return array This method returns an array containing all nodes |
---|
2229 | * that were found during the evaluation of the given axis. |
---|
2230 | * @see evaluate() |
---|
2231 | */ |
---|
2232 | function handle_axis_preceding ( $axis, $context ) |
---|
2233 | { |
---|
2234 | // Create an empty node-set. |
---|
2235 | $nodes = array(); |
---|
2236 | |
---|
2237 | // Get the current document position. |
---|
2238 | $position = $this->nodes[$context]["document-position"]; |
---|
2239 | |
---|
2240 | // Create a flag, whether we already found the context node. |
---|
2241 | $found = true; |
---|
2242 | |
---|
2243 | // Run through all nodes of the document. |
---|
2244 | foreach ( $this->nodes as $node => $data ) |
---|
2245 | { |
---|
2246 | // Check whether this is the context node. |
---|
2247 | if ( $node == $context ) |
---|
2248 | { |
---|
2249 | // After this we won't look for more nodes. |
---|
2250 | $found = false; |
---|
2251 | } |
---|
2252 | |
---|
2253 | // Check whether the context node has already been found. |
---|
2254 | if ( $found ) |
---|
2255 | { |
---|
2256 | // Check whether the position is correct. |
---|
2257 | if ( $this->nodes[$node]["document-position"] == $position ) |
---|
2258 | { |
---|
2259 | // Check whether the node fits the node-test. |
---|
2260 | if ( $this->check_node_test($node, $axis["node-test"]) ) |
---|
2261 | { |
---|
2262 | // Add the node to the list of nodes. |
---|
2263 | $nodes[] = $node; |
---|
2264 | } |
---|
2265 | } |
---|
2266 | } |
---|
2267 | } |
---|
2268 | |
---|
2269 | // Return the nodeset. |
---|
2270 | return $nodes; |
---|
2271 | } |
---|
2272 | |
---|
2273 | /** |
---|
2274 | * Handles the XPath following-sibling axis. |
---|
2275 | * |
---|
2276 | * This method handles the XPath following-sibling axis. |
---|
2277 | * |
---|
2278 | * @access private |
---|
2279 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
2280 | * @param array $axis Array containing information about the axis. |
---|
2281 | * @param string $context Node from which starting the axis should |
---|
2282 | * be processed. |
---|
2283 | * @return array This method returns an array containing all nodes |
---|
2284 | * that were found during the evaluation of the given axis. |
---|
2285 | * @see evaluate() |
---|
2286 | */ |
---|
2287 | function handle_axis_following_sibling ( $axis, $context ) |
---|
2288 | { |
---|
2289 | // Create an empty node-set. |
---|
2290 | $nodes = array(); |
---|
2291 | |
---|
2292 | // Get all children from the parent. |
---|
2293 | $siblings = $this->handle_axis_child($axis, |
---|
2294 | $this->nodes[$context]["parent"]); |
---|
2295 | |
---|
2296 | // Create a flag whether the context node was already found. |
---|
2297 | $found = false; |
---|
2298 | |
---|
2299 | // Run through all siblings. |
---|
2300 | foreach ( $siblings as $sibling ) |
---|
2301 | { |
---|
2302 | // Check whether the context node was already found. |
---|
2303 | if ( $found ) |
---|
2304 | { |
---|
2305 | // Check whether the sibling is a real sibling. |
---|
2306 | if ( $this->nodes[$sibling]["name"] == |
---|
2307 | $this->nodes[$context]["name"] ) |
---|
2308 | { |
---|
2309 | // Check whether the sibling matches the node-test. |
---|
2310 | if ( $this->check_node_test($sibling, $axis["node-test"]) ) |
---|
2311 | { |
---|
2312 | // Add the sibling to the list of nodes. |
---|
2313 | $nodes[] = $sibling; |
---|
2314 | } |
---|
2315 | } |
---|
2316 | } |
---|
2317 | |
---|
2318 | // Check whether this is the context node. |
---|
2319 | if ( $sibling == $context ) |
---|
2320 | { |
---|
2321 | // Continue looking for other siblings. |
---|
2322 | $found = true; |
---|
2323 | } |
---|
2324 | } |
---|
2325 | |
---|
2326 | // Return the nodeset. |
---|
2327 | return $nodes; |
---|
2328 | } |
---|
2329 | |
---|
2330 | /** |
---|
2331 | * Handles the XPath preceding-sibling axis. |
---|
2332 | * |
---|
2333 | * This method handles the XPath preceding-sibling axis. |
---|
2334 | * |
---|
2335 | * @access private |
---|
2336 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
2337 | * @param array $axis Array containing information about the axis. |
---|
2338 | * @param string $context Node from which starting the axis should |
---|
2339 | * be processed. |
---|
2340 | * @return array This method returns an array containing all nodes |
---|
2341 | * that were found during the evaluation of the given axis. |
---|
2342 | * @see evaluate() |
---|
2343 | */ |
---|
2344 | function handle_axis_preceding_sibling ( $axis, $context ) |
---|
2345 | { |
---|
2346 | // Create an empty node-set. |
---|
2347 | $nodes = array(); |
---|
2348 | |
---|
2349 | // Get all children from the parent. |
---|
2350 | $siblings = $this->handle_axis_child($axis, |
---|
2351 | $this->nodes[$context]["parent"]); |
---|
2352 | |
---|
2353 | // Create a flag whether the context node was already found. |
---|
2354 | $found = true; |
---|
2355 | |
---|
2356 | // Run through all siblings. |
---|
2357 | foreach ( $siblings as $sibling ) |
---|
2358 | { |
---|
2359 | // Check whether this is the context node. |
---|
2360 | if ( $sibling == $context ) |
---|
2361 | { |
---|
2362 | // Don't continue looking for other siblings. |
---|
2363 | $found = false; |
---|
2364 | } |
---|
2365 | |
---|
2366 | // Check whether the context node was already found. |
---|
2367 | if ( $found ) |
---|
2368 | { |
---|
2369 | // Check whether the sibling is a real sibling. |
---|
2370 | if ( $this->nodes[$sibling]["name"] == |
---|
2371 | $this->nodes[$context]["name"] ) |
---|
2372 | { |
---|
2373 | // Check whether the sibling matches the node-test. |
---|
2374 | if ( $this->check_node_test($sibling, $axis["node-test"]) ) |
---|
2375 | { |
---|
2376 | // Add the sibling to the list of nodes. |
---|
2377 | $nodes[] = $sibling; |
---|
2378 | } |
---|
2379 | } |
---|
2380 | } |
---|
2381 | } |
---|
2382 | |
---|
2383 | // Return the nodeset. |
---|
2384 | return $nodes; |
---|
2385 | } |
---|
2386 | |
---|
2387 | /** |
---|
2388 | * Handles the XPath descendant-or-self axis. |
---|
2389 | * |
---|
2390 | * This method handles the XPath descendant-or-self axis. |
---|
2391 | * |
---|
2392 | * @access private |
---|
2393 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
2394 | * @param array $axis Array containing information about the axis. |
---|
2395 | * @param string $context Node from which starting the axis should |
---|
2396 | * be processed. |
---|
2397 | * @return array This method returns an array containing all nodes |
---|
2398 | * that were found during the evaluation of the given axis. |
---|
2399 | * @see evaluate() |
---|
2400 | */ |
---|
2401 | function handle_axis_descendant_or_self ( $axis, $context ) |
---|
2402 | { |
---|
2403 | // Create an empty node-set. |
---|
2404 | $nodes = array(); |
---|
2405 | |
---|
2406 | // Read the nodes. |
---|
2407 | $nodes = array_merge( |
---|
2408 | $this->handle_axis_descendant($axis, $context), |
---|
2409 | $this->handle_axis_self($axis, $context)); |
---|
2410 | |
---|
2411 | // Return the nodeset. |
---|
2412 | return $nodes; |
---|
2413 | } |
---|
2414 | |
---|
2415 | /** |
---|
2416 | * Handles the XPath ancestor-or-self axis. |
---|
2417 | * |
---|
2418 | * This method handles the XPath ancestor-or-self axis. |
---|
2419 | * |
---|
2420 | * @access private |
---|
2421 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
2422 | * @param array $axis Array containing information about the axis. |
---|
2423 | * @param string $context Node from which starting the axis should |
---|
2424 | * be processed. |
---|
2425 | * @return array This method returns an array containing all nodes |
---|
2426 | * that were found during the evaluation of the given axis. |
---|
2427 | * @see evaluate() |
---|
2428 | */ |
---|
2429 | function handle_axis_ancestor_or_self ( $axis, $context ) |
---|
2430 | { |
---|
2431 | // Create an empty node-set. |
---|
2432 | $nodes = array(); |
---|
2433 | |
---|
2434 | // Read the nodes. |
---|
2435 | $nodes = array_merge( |
---|
2436 | $this->handle_axis_ancestor($axis, $context), |
---|
2437 | $this->handle_axis_self($axis, $context)); |
---|
2438 | |
---|
2439 | // Return the nodeset. |
---|
2440 | return $nodes; |
---|
2441 | } |
---|
2442 | |
---|
2443 | /** |
---|
2444 | * Handles the XPath function last. |
---|
2445 | * |
---|
2446 | * This method handles the XPath function last. |
---|
2447 | * |
---|
2448 | * @access private |
---|
2449 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
2450 | * @param string $node Full path of the node on which the function |
---|
2451 | * should be processed. |
---|
2452 | * @param string $arguments String containing the arguments that were |
---|
2453 | * passed to the function. |
---|
2454 | * @return mixed Depending on the type of function being processed this |
---|
2455 | * method returns different types. |
---|
2456 | * @see evaluate() |
---|
2457 | */ |
---|
2458 | function handle_function_last ( $node, $arguments ) |
---|
2459 | { |
---|
2460 | // Calculate the size of the context. |
---|
2461 | $parent = $this->nodes[$node]["parent"]; |
---|
2462 | $children = $this->nodes[$parent]["children"]; |
---|
2463 | $context = $children[$this->nodes[$node]["name"]]; |
---|
2464 | |
---|
2465 | // Return the size. |
---|
2466 | return $context; |
---|
2467 | } |
---|
2468 | |
---|
2469 | /** |
---|
2470 | * Handles the XPath function position. |
---|
2471 | * |
---|
2472 | * This method handles the XPath function position. |
---|
2473 | * |
---|
2474 | * @access private |
---|
2475 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
2476 | * @param string $node Full path of the node on which the function |
---|
2477 | * should be processed. |
---|
2478 | * @param string $arguments String containing the arguments that were |
---|
2479 | * passed to the function. |
---|
2480 | * @return mixed Depending on the type of function being processed this |
---|
2481 | * method returns different types. |
---|
2482 | * @see evaluate() |
---|
2483 | */ |
---|
2484 | function handle_function_position ( $node, $arguments ) |
---|
2485 | { |
---|
2486 | // return the context-position. |
---|
2487 | return $this->nodes[$node]["context-position"]; |
---|
2488 | } |
---|
2489 | |
---|
2490 | /** |
---|
2491 | * Handles the XPath function count. |
---|
2492 | * |
---|
2493 | * This method handles the XPath function count. |
---|
2494 | * |
---|
2495 | * @access private |
---|
2496 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
2497 | * @param string $node Full path of the node on which the function |
---|
2498 | * should be processed. |
---|
2499 | * @param string $arguments String containing the arguments that were |
---|
2500 | * passed to the function. |
---|
2501 | * @return mixed Depending on the type of function being processed this |
---|
2502 | * method returns different types. |
---|
2503 | * @see evaluate() |
---|
2504 | */ |
---|
2505 | function handle_function_count ( $node, $arguments ) |
---|
2506 | { |
---|
2507 | // Evaluate the argument of the method as an XPath and return |
---|
2508 | // the number of results. |
---|
2509 | return count($this->evaluate($arguments, $node)); |
---|
2510 | } |
---|
2511 | |
---|
2512 | /** |
---|
2513 | * Handles the XPath function id. |
---|
2514 | * |
---|
2515 | * This method handles the XPath function id. |
---|
2516 | * |
---|
2517 | * @access private |
---|
2518 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
2519 | * @param string $node Full path of the node on which the function |
---|
2520 | * should be processed. |
---|
2521 | * @param string $arguments String containing the arguments that were |
---|
2522 | * passed to the function. |
---|
2523 | * @return mixed Depending on the type of function being processed this |
---|
2524 | * method returns different types. |
---|
2525 | * @see evaluate() |
---|
2526 | */ |
---|
2527 | function handle_function_id ( $node, $arguments ) |
---|
2528 | { |
---|
2529 | // Trim the arguments. |
---|
2530 | $arguments = trim($arguments); |
---|
2531 | |
---|
2532 | // Now split the arguments. |
---|
2533 | $arguments = explode(" ", $arguments); |
---|
2534 | |
---|
2535 | // Check whether |
---|
2536 | |
---|
2537 | // Create a list of nodes. |
---|
2538 | $nodes = array(); |
---|
2539 | |
---|
2540 | // Run through all document node. |
---|
2541 | foreach ( $this->nodes as $node => $position ) |
---|
2542 | { |
---|
2543 | // Check whether the node has the ID we're looking for. |
---|
2544 | if ( in_array($this->nodes[$node]["attributes"]["id"], |
---|
2545 | $arguments) ) |
---|
2546 | { |
---|
2547 | // Add this node to the list of nodes. |
---|
2548 | $nodes[] = $node; |
---|
2549 | } |
---|
2550 | } |
---|
2551 | |
---|
2552 | // Return the list of nodes. |
---|
2553 | return $nodes; |
---|
2554 | } |
---|
2555 | |
---|
2556 | /** |
---|
2557 | * Handles the XPath function name. |
---|
2558 | * |
---|
2559 | * This method handles the XPath function name. |
---|
2560 | * |
---|
2561 | * @access private |
---|
2562 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
2563 | * @param string $node Full path of the node on which the function |
---|
2564 | * should be processed. |
---|
2565 | * @param string $arguments String containing the arguments that were |
---|
2566 | * passed to the function. |
---|
2567 | * @return mixed Depending on the type of function being processed this |
---|
2568 | * method returns different types. |
---|
2569 | * @see evaluate() |
---|
2570 | */ |
---|
2571 | function handle_function_name ( $node, $arguments ) |
---|
2572 | { |
---|
2573 | // Return the name of the node. |
---|
2574 | return $this->nodes[$node]["name"]; |
---|
2575 | } |
---|
2576 | |
---|
2577 | /** |
---|
2578 | * Handles the XPath function string. |
---|
2579 | * |
---|
2580 | * This method handles the XPath function string. |
---|
2581 | * |
---|
2582 | * @access private |
---|
2583 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
2584 | * @param string $node Full path of the node on which the function |
---|
2585 | * should be processed. |
---|
2586 | * @param string $arguments String containing the arguments that were |
---|
2587 | * passed to the function. |
---|
2588 | * @return mixed Depending on the type of function being processed this |
---|
2589 | * method returns different types. |
---|
2590 | * @see evaluate() |
---|
2591 | */ |
---|
2592 | function handle_function_string ( $node, $arguments ) |
---|
2593 | { |
---|
2594 | // Check what type of parameter is given |
---|
2595 | if ( ereg("^[0-9]+(\.[0-9]+)?$", $arguments) || |
---|
2596 | ereg("^\.[0-9]+$", $arguments) ) |
---|
2597 | { |
---|
2598 | // Convert the digits to a number. |
---|
2599 | $number = doubleval($arguments); |
---|
2600 | |
---|
2601 | // Return the number. |
---|
2602 | return strval($number); |
---|
2603 | } |
---|
2604 | elseif ( is_bool($arguments) ) |
---|
2605 | { |
---|
2606 | // Check whether it's true. |
---|
2607 | if ( $arguments == true ) |
---|
2608 | { |
---|
2609 | // Return true as a string. |
---|
2610 | return "true"; |
---|
2611 | } |
---|
2612 | else |
---|
2613 | { |
---|
2614 | // Return false as a string. |
---|
2615 | return "false"; |
---|
2616 | } |
---|
2617 | } |
---|
2618 | elseif ( !empty($arguments) ) |
---|
2619 | { |
---|
2620 | // Use the argument as an XPath. |
---|
2621 | $result = $this->evaluate($arguments, $node); |
---|
2622 | |
---|
2623 | // Get the first argument. |
---|
2624 | $result = explode("|", implode("|", $result)); |
---|
2625 | |
---|
2626 | // Return the first result as a string. |
---|
2627 | return $result[0]; |
---|
2628 | } |
---|
2629 | elseif ( empty($arguments) ) |
---|
2630 | { |
---|
2631 | // Return the current node. |
---|
2632 | return $node; |
---|
2633 | } |
---|
2634 | else |
---|
2635 | { |
---|
2636 | // Return an empty string. |
---|
2637 | return ""; |
---|
2638 | } |
---|
2639 | } |
---|
2640 | |
---|
2641 | /** |
---|
2642 | * Handles the XPath function concat. |
---|
2643 | * |
---|
2644 | * This method handles the XPath function concat. |
---|
2645 | * |
---|
2646 | * @access private |
---|
2647 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
2648 | * @param string $node Full path of the node on which the function |
---|
2649 | * should be processed. |
---|
2650 | * @param string $arguments String containing the arguments that were |
---|
2651 | * passed to the function. |
---|
2652 | * @return mixed Depending on the type of function being processed this |
---|
2653 | * method returns different types. |
---|
2654 | * @see evaluate() |
---|
2655 | */ |
---|
2656 | function handle_function_concat ( $node, $arguments ) |
---|
2657 | { |
---|
2658 | // Split the arguments. |
---|
2659 | $arguments = explode(",", $arguments); |
---|
2660 | |
---|
2661 | // Run through each argument and evaluate it. |
---|
2662 | for ( $i = 0; $i < sizeof($arguments); $i++ ) |
---|
2663 | { |
---|
2664 | // Trim each argument. |
---|
2665 | $arguments[$i] = trim($arguments[$i]); |
---|
2666 | |
---|
2667 | // Evaluate it. |
---|
2668 | $arguments[$i] = $this->evaluate_predicate($node, $arguments[$i]); |
---|
2669 | } |
---|
2670 | |
---|
2671 | // Put the string together. |
---|
2672 | $arguments = implode("", $arguments); |
---|
2673 | |
---|
2674 | // Return the string. |
---|
2675 | return $arguments; |
---|
2676 | } |
---|
2677 | |
---|
2678 | /** |
---|
2679 | * Handles the XPath function starts-with. |
---|
2680 | * |
---|
2681 | * This method handles the XPath function starts-with. |
---|
2682 | * |
---|
2683 | * @access private |
---|
2684 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
2685 | * @param string $node Full path of the node on which the function |
---|
2686 | * should be processed. |
---|
2687 | * @param string $arguments String containing the arguments that were |
---|
2688 | * passed to the function. |
---|
2689 | * @return mixed Depending on the type of function being processed this |
---|
2690 | * method returns different types. |
---|
2691 | * @see evaluate() |
---|
2692 | */ |
---|
2693 | function handle_function_starts_with ( $node, $arguments ) |
---|
2694 | { |
---|
2695 | // Get the arguments. |
---|
2696 | $first = trim($this->prestr($arguments, ",")); |
---|
2697 | $second = trim($this->afterstr($arguments, ",")); |
---|
2698 | |
---|
2699 | // Evaluate each argument. |
---|
2700 | $first = $this->evaluate_predicate($node, $first); |
---|
2701 | $second = $this->evaluate_predicate($node, $second); |
---|
2702 | |
---|
2703 | // Check whether the first string starts with the second one. |
---|
2704 | if ( ereg("^".$second, $first) ) |
---|
2705 | { |
---|
2706 | // Return true. |
---|
2707 | return true; |
---|
2708 | } |
---|
2709 | else |
---|
2710 | { |
---|
2711 | // Return false. |
---|
2712 | return false; |
---|
2713 | } |
---|
2714 | } |
---|
2715 | |
---|
2716 | /** |
---|
2717 | * Handles the XPath function contains. |
---|
2718 | * |
---|
2719 | * This method handles the XPath function contains. |
---|
2720 | * |
---|
2721 | * @access private |
---|
2722 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
2723 | * @param string $node Full path of the node on which the function |
---|
2724 | * should be processed. |
---|
2725 | * @param string $arguments String containing the arguments that were |
---|
2726 | * passed to the function. |
---|
2727 | * @return mixed Depending on the type of function being processed this |
---|
2728 | * method returns different types. |
---|
2729 | * @see evaluate() |
---|
2730 | */ |
---|
2731 | function handle_function_contains ( $node, $arguments ) |
---|
2732 | { |
---|
2733 | // Get the arguments. |
---|
2734 | $first = trim($this->prestr($arguments, ",")); |
---|
2735 | $second = trim($this->afterstr($arguments, ",")); |
---|
2736 | |
---|
2737 | // Evaluate each argument. |
---|
2738 | $first = $this->evaluate_predicate($node, $first); |
---|
2739 | $second = $this->evaluate_predicate($node, $second); |
---|
2740 | |
---|
2741 | // Check whether the first string starts with the second one. |
---|
2742 | if ( ereg($second, $first) ) |
---|
2743 | { |
---|
2744 | // Return true. |
---|
2745 | return true; |
---|
2746 | } |
---|
2747 | else |
---|
2748 | { |
---|
2749 | // Return false. |
---|
2750 | return false; |
---|
2751 | } |
---|
2752 | } |
---|
2753 | |
---|
2754 | /** |
---|
2755 | * Handles the XPath function substring-before. |
---|
2756 | * |
---|
2757 | * This method handles the XPath function substring-before. |
---|
2758 | * |
---|
2759 | * @access private |
---|
2760 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
2761 | * @param string $node Full path of the node on which the function |
---|
2762 | * should be processed. |
---|
2763 | * @param string $arguments String containing the arguments that were |
---|
2764 | * passed to the function. |
---|
2765 | * @return mixed Depending on the type of function being processed this |
---|
2766 | * method returns different types. |
---|
2767 | * @see evaluate() |
---|
2768 | */ |
---|
2769 | function handle_function_substring_before ( $node, $arguments ) |
---|
2770 | { |
---|
2771 | // Get the arguments. |
---|
2772 | $first = trim($this->prestr($arguments, ",")); |
---|
2773 | $second = trim($this->afterstr($arguments, ",")); |
---|
2774 | |
---|
2775 | // Evaluate each argument. |
---|
2776 | $first = $this->evaluate_predicate($node, $first); |
---|
2777 | $second = $this->evaluate_predicate($node, $second); |
---|
2778 | |
---|
2779 | // Return the substring. |
---|
2780 | return $this->prestr(strval($first), strval($second)); |
---|
2781 | } |
---|
2782 | |
---|
2783 | /** |
---|
2784 | * Handles the XPath function substring-after. |
---|
2785 | * |
---|
2786 | * This method handles the XPath function substring-after. |
---|
2787 | * |
---|
2788 | * @access private |
---|
2789 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
2790 | * @param string $node Full path of the node on which the function |
---|
2791 | * should be processed. |
---|
2792 | * @param string $arguments String containing the arguments that were |
---|
2793 | * passed to the function. |
---|
2794 | * @return mixed Depending on the type of function being processed this |
---|
2795 | * method returns different types. |
---|
2796 | * @see evaluate() |
---|
2797 | */ |
---|
2798 | function handle_function_substring_after ( $node, $arguments ) |
---|
2799 | { |
---|
2800 | // Get the arguments. |
---|
2801 | $first = trim($this->prestr($arguments, ",")); |
---|
2802 | $second = trim($this->afterstr($arguments, ",")); |
---|
2803 | |
---|
2804 | // Evaluate each argument. |
---|
2805 | $first = $this->evaluate_predicate($node, $first); |
---|
2806 | $second = $this->evaluate_predicate($node, $second); |
---|
2807 | |
---|
2808 | // Return the substring. |
---|
2809 | return $this->afterstr(strval($first), strval($second)); |
---|
2810 | } |
---|
2811 | |
---|
2812 | /** |
---|
2813 | * Handles the XPath function substring. |
---|
2814 | * |
---|
2815 | * This method handles the XPath function substring. |
---|
2816 | * |
---|
2817 | * @access private |
---|
2818 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
2819 | * @param string $node Full path of the node on which the function |
---|
2820 | * should be processed. |
---|
2821 | * @param string $arguments String containing the arguments that were |
---|
2822 | * passed to the function. |
---|
2823 | * @return mixed Depending on the type of function being processed this |
---|
2824 | * method returns different types. |
---|
2825 | * @see evaluate() |
---|
2826 | */ |
---|
2827 | function handle_function_substring ( $node, $arguments ) |
---|
2828 | { |
---|
2829 | // Split the arguments. |
---|
2830 | $arguments = explode(",", $arguments); |
---|
2831 | |
---|
2832 | // Run through all arguments. |
---|
2833 | for ( $i = 0; $i < sizeof($arguments); $i++ ) |
---|
2834 | { |
---|
2835 | // Trim the string. |
---|
2836 | $arguments[$i] = trim($arguments[$i]); |
---|
2837 | |
---|
2838 | // Evaluate each argument. |
---|
2839 | $arguments[$i] = $this->evaluate_predicate($node, $arguments[$i]); |
---|
2840 | } |
---|
2841 | |
---|
2842 | // Check whether a third argument was given. |
---|
2843 | if ( !empty($arguments[2]) ) |
---|
2844 | { |
---|
2845 | // Return the substring. |
---|
2846 | return substr(strval($arguments[0]), $arguments[1] - 1, |
---|
2847 | $arguments[2]); |
---|
2848 | } |
---|
2849 | else |
---|
2850 | { |
---|
2851 | // Return the substring. |
---|
2852 | return substr(strval($arguments[0]), $arguments[1] - 1); |
---|
2853 | } |
---|
2854 | } |
---|
2855 | |
---|
2856 | /** |
---|
2857 | * Handles the XPath function string-length. |
---|
2858 | * |
---|
2859 | * This method handles the XPath function string-length. |
---|
2860 | * |
---|
2861 | * @access private |
---|
2862 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
2863 | * @param string $node Full path of the node on which the function |
---|
2864 | * should be processed. |
---|
2865 | * @param string $arguments String containing the arguments that were |
---|
2866 | * passed to the function. |
---|
2867 | * @return mixed Depending on the type of function being processed this |
---|
2868 | * method returns different types. |
---|
2869 | * @see evaluate() |
---|
2870 | */ |
---|
2871 | function handle_function_string_length ( $node, $arguments ) |
---|
2872 | { |
---|
2873 | // Trim the argument. |
---|
2874 | $arguments = trim($arguments); |
---|
2875 | |
---|
2876 | // Evaluate the argument. |
---|
2877 | $arguments = $this->evaluate_predicate($node, $arguments); |
---|
2878 | |
---|
2879 | // Return the length of the string. |
---|
2880 | return strlen(strval($arguments)); |
---|
2881 | } |
---|
2882 | |
---|
2883 | /** |
---|
2884 | * Handles the XPath function translate. |
---|
2885 | * |
---|
2886 | * This method handles the XPath function translate. |
---|
2887 | * |
---|
2888 | * @access private |
---|
2889 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
2890 | * @param string $node Full path of the node on which the function |
---|
2891 | * should be processed. |
---|
2892 | * @param string $arguments String containing the arguments that were |
---|
2893 | * passed to the function. |
---|
2894 | * @return mixed Depending on the type of function being processed this |
---|
2895 | * method returns different types. |
---|
2896 | * @see evaluate() |
---|
2897 | */ |
---|
2898 | function handle_function_translate ( $node, $arguments ) |
---|
2899 | { |
---|
2900 | // Split the arguments. |
---|
2901 | $arguments = explode(",", $arguments); |
---|
2902 | |
---|
2903 | // Run through all arguments. |
---|
2904 | for ( $i = 0; $i < sizeof($arguments); $i++ ) |
---|
2905 | { |
---|
2906 | // Trim the argument. |
---|
2907 | $arguments[$i] = trim($arguments[$i]); |
---|
2908 | |
---|
2909 | // Evaluate the argument. |
---|
2910 | $arguments[$i] = $this->evaluate_predicate($node, $arguments[$i]); |
---|
2911 | } |
---|
2912 | |
---|
2913 | // Return the translated string. |
---|
2914 | return strtr($arguments[0], $arguments[1], $arguments[2]); |
---|
2915 | } |
---|
2916 | |
---|
2917 | /** |
---|
2918 | * Handles the XPath function boolean. |
---|
2919 | * |
---|
2920 | * This method handles the XPath function boolean. |
---|
2921 | * |
---|
2922 | * @access private |
---|
2923 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
2924 | * @param string $node Full path of the node on which the function |
---|
2925 | * should be processed. |
---|
2926 | * @param string $arguments String containing the arguments that were |
---|
2927 | * passed to the function. |
---|
2928 | * @return mixed Depending on the type of function being processed this |
---|
2929 | * method returns different types. |
---|
2930 | * @see evaluate() |
---|
2931 | */ |
---|
2932 | function handle_function_boolean ( $node, $arguments ) |
---|
2933 | { |
---|
2934 | // Trim the arguments. |
---|
2935 | $arguments = trim($arguments); |
---|
2936 | |
---|
2937 | // Check what type of parameter is given |
---|
2938 | if ( ereg("^[0-9]+(\.[0-9]+)?$", $arguments) || |
---|
2939 | ereg("^\.[0-9]+$", $arguments) ) |
---|
2940 | { |
---|
2941 | // Convert the digits to a number. |
---|
2942 | $number = doubleval($arguments); |
---|
2943 | |
---|
2944 | // Check whether the number zero. |
---|
2945 | if ( $number == 0 ) |
---|
2946 | { |
---|
2947 | // Return false. |
---|
2948 | return false; |
---|
2949 | } |
---|
2950 | else |
---|
2951 | { |
---|
2952 | // Return true. |
---|
2953 | return true; |
---|
2954 | } |
---|
2955 | } |
---|
2956 | elseif ( empty($arguments) ) |
---|
2957 | { |
---|
2958 | // Sorry, there were no arguments. |
---|
2959 | return false; |
---|
2960 | } |
---|
2961 | else |
---|
2962 | { |
---|
2963 | // Try to evaluate the argument as an XPath. |
---|
2964 | $result = $this->evaluate($arguments, $node); |
---|
2965 | |
---|
2966 | // Check whether we found something. |
---|
2967 | if ( count($result) > 0 ) |
---|
2968 | { |
---|
2969 | // Return true. |
---|
2970 | return true; |
---|
2971 | } |
---|
2972 | else |
---|
2973 | { |
---|
2974 | // Return false. |
---|
2975 | return false; |
---|
2976 | } |
---|
2977 | } |
---|
2978 | } |
---|
2979 | |
---|
2980 | /** |
---|
2981 | * Handles the XPath function not. |
---|
2982 | * |
---|
2983 | * This method handles the XPath function not. |
---|
2984 | * |
---|
2985 | * @access private |
---|
2986 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
2987 | * @param string $node Full path of the node on which the function |
---|
2988 | * should be processed. |
---|
2989 | * @param string $arguments String containing the arguments that were |
---|
2990 | * passed to the function. |
---|
2991 | * @return mixed Depending on the type of function being processed this |
---|
2992 | * method returns different types. |
---|
2993 | * @see evaluate() |
---|
2994 | */ |
---|
2995 | function handle_function_not ( $node, $arguments ) |
---|
2996 | { |
---|
2997 | // Trim the arguments. |
---|
2998 | $arguments = trim($arguments); |
---|
2999 | |
---|
3000 | // Return the negative value of the content of the brackets. |
---|
3001 | return !$this->evaluate_predicate($node, $arguments); |
---|
3002 | } |
---|
3003 | |
---|
3004 | /** |
---|
3005 | * Handles the XPath function true. |
---|
3006 | * |
---|
3007 | * This method handles the XPath function true. |
---|
3008 | * |
---|
3009 | * @access private |
---|
3010 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
3011 | * @param string $node Full path of the node on which the function |
---|
3012 | * should be processed. |
---|
3013 | * @param string $arguments String containing the arguments that were |
---|
3014 | * passed to the function. |
---|
3015 | * @return mixed Depending on the type of function being processed this |
---|
3016 | * method returns different types. |
---|
3017 | * @see evaluate() |
---|
3018 | */ |
---|
3019 | function handle_function_true ( $node, $arguments ) |
---|
3020 | { |
---|
3021 | // Return true. |
---|
3022 | return true; |
---|
3023 | } |
---|
3024 | |
---|
3025 | /** |
---|
3026 | * Handles the XPath function false. |
---|
3027 | * |
---|
3028 | * This method handles the XPath function false. |
---|
3029 | * |
---|
3030 | * @access private |
---|
3031 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
3032 | * @param string $node Full path of the node on which the function |
---|
3033 | * should be processed. |
---|
3034 | * @param string $arguments String containing the arguments that were |
---|
3035 | * passed to the function. |
---|
3036 | * @return mixed Depending on the type of function being processed this |
---|
3037 | * method returns different types. |
---|
3038 | * @see evaluate() |
---|
3039 | */ |
---|
3040 | function handle_function_false ( $node, $arguments ) |
---|
3041 | { |
---|
3042 | // Return false. |
---|
3043 | return false; |
---|
3044 | } |
---|
3045 | |
---|
3046 | /** |
---|
3047 | * Handles the XPath function lang. |
---|
3048 | * |
---|
3049 | * This method handles the XPath function lang. |
---|
3050 | * |
---|
3051 | * @access private |
---|
3052 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
3053 | * @param string $node Full path of the node on which the function |
---|
3054 | * should be processed. |
---|
3055 | * @param string $arguments String containing the arguments that were |
---|
3056 | * passed to the function. |
---|
3057 | * @return mixed Depending on the type of function being processed this |
---|
3058 | * method returns different types. |
---|
3059 | * @see evaluate() |
---|
3060 | */ |
---|
3061 | function handle_function_lang ( $node, $arguments ) |
---|
3062 | { |
---|
3063 | // Trim the arguments. |
---|
3064 | $arguments = trim($arguments); |
---|
3065 | |
---|
3066 | // Check whether the node has an language attribute. |
---|
3067 | if ( empty($this->nodes[$node]["attributes"]["xml:lang"]) ) |
---|
3068 | { |
---|
3069 | // Run through the ancestors. |
---|
3070 | while ( !empty($node) ) |
---|
3071 | { |
---|
3072 | // Select the parent node. |
---|
3073 | $node = $this->nodes[$node]["parent"]; |
---|
3074 | |
---|
3075 | // Check whether there's a language definition. |
---|
3076 | if ( !empty($this->nodes[$node]["attributes"]["xml:lang"]) ) |
---|
3077 | { |
---|
3078 | // Check whether it's the language, the user asks for. |
---|
3079 | if ( eregi("^".$arguments, $this->nodes[$node] |
---|
3080 | ["attributes"]["xml:lang"]) ) |
---|
3081 | { |
---|
3082 | // Return true. |
---|
3083 | return true; |
---|
3084 | } |
---|
3085 | else |
---|
3086 | { |
---|
3087 | // Return false. |
---|
3088 | return false; |
---|
3089 | } |
---|
3090 | } |
---|
3091 | } |
---|
3092 | |
---|
3093 | // Return false. |
---|
3094 | return false; |
---|
3095 | } |
---|
3096 | else |
---|
3097 | { |
---|
3098 | // Check whether it's the language, the user asks for. |
---|
3099 | if ( eregi("^".$arguments, $this->nodes[$node]["attributes"] |
---|
3100 | ["xml:lang"]) ) |
---|
3101 | { |
---|
3102 | // Return true. |
---|
3103 | return true; |
---|
3104 | } |
---|
3105 | else |
---|
3106 | { |
---|
3107 | // Return false. |
---|
3108 | return false; |
---|
3109 | } |
---|
3110 | } |
---|
3111 | } |
---|
3112 | |
---|
3113 | /** |
---|
3114 | * Handles the XPath function number. |
---|
3115 | * |
---|
3116 | * This method handles the XPath function number. |
---|
3117 | * |
---|
3118 | * @access private |
---|
3119 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
3120 | * @param string $node Full path of the node on which the function |
---|
3121 | * should be processed. |
---|
3122 | * @param string $arguments String containing the arguments that were |
---|
3123 | * passed to the function. |
---|
3124 | * @return mixed Depending on the type of function being processed this |
---|
3125 | * method returns different types. |
---|
3126 | * @see evaluate() |
---|
3127 | */ |
---|
3128 | function handle_function_number ( $node, $arguments ) |
---|
3129 | { |
---|
3130 | // Check the type of argument. |
---|
3131 | if ( ereg("^[0-9]+(\.[0-9]+)?$", $arguments) || |
---|
3132 | ereg("^\.[0-9]+$", $arguments) ) |
---|
3133 | { |
---|
3134 | // Return the argument as a number. |
---|
3135 | return doubleval($arguments); |
---|
3136 | } |
---|
3137 | elseif ( is_bool($arguments) ) |
---|
3138 | { |
---|
3139 | // Check whether it's true. |
---|
3140 | if ( $arguments == true ) |
---|
3141 | { |
---|
3142 | // Return 1. |
---|
3143 | return 1; |
---|
3144 | } |
---|
3145 | else |
---|
3146 | { |
---|
3147 | // Return 0. |
---|
3148 | return 0; |
---|
3149 | } |
---|
3150 | } |
---|
3151 | } |
---|
3152 | |
---|
3153 | /** |
---|
3154 | * Handles the XPath function sum. |
---|
3155 | * |
---|
3156 | * This method handles the XPath function sum. |
---|
3157 | * |
---|
3158 | * @access private |
---|
3159 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
3160 | * @param string $node Full path of the node on which the function |
---|
3161 | * should be processed. |
---|
3162 | * @param string $arguments String containing the arguments that were |
---|
3163 | * passed to the function. |
---|
3164 | * @return mixed Depending on the type of function being processed this |
---|
3165 | * method returns different types. |
---|
3166 | * @see evaluate() |
---|
3167 | */ |
---|
3168 | function handle_function_sum ( $node, $arguments ) |
---|
3169 | { |
---|
3170 | // Trim the arguments. |
---|
3171 | $arguments = trim($arguments); |
---|
3172 | |
---|
3173 | // Evaluate the arguments as an XPath expression. |
---|
3174 | $results = $this->evaluate($arguments, $node); |
---|
3175 | |
---|
3176 | // Create a variable to save the sum. |
---|
3177 | $sum = 0; |
---|
3178 | |
---|
3179 | // Run through all results. |
---|
3180 | foreach ( $results as $result ) |
---|
3181 | { |
---|
3182 | // Get the value of the node. |
---|
3183 | $result = $this->get_content($result); |
---|
3184 | |
---|
3185 | // Add it to the sum. |
---|
3186 | $sum += doubleval($result); |
---|
3187 | } |
---|
3188 | |
---|
3189 | // Return the sum. |
---|
3190 | return $sum; |
---|
3191 | } |
---|
3192 | |
---|
3193 | /** |
---|
3194 | * Handles the XPath function floor. |
---|
3195 | * |
---|
3196 | * This method handles the XPath function floor. |
---|
3197 | * |
---|
3198 | * @access private |
---|
3199 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
3200 | * @param string $node Full path of the node on which the function |
---|
3201 | * should be processed. |
---|
3202 | * @param string $arguments String containing the arguments that were |
---|
3203 | * passed to the function. |
---|
3204 | * @return mixed Depending on the type of function being processed this |
---|
3205 | * method returns different types. |
---|
3206 | * @see evaluate() |
---|
3207 | */ |
---|
3208 | function handle_function_floor ( $node, $arguments ) |
---|
3209 | { |
---|
3210 | // Trim the arguments. |
---|
3211 | $arguments = trim($arguments); |
---|
3212 | |
---|
3213 | // Convert the arguments to a number. |
---|
3214 | $arguments = doubleval($arguments); |
---|
3215 | |
---|
3216 | // Return the result |
---|
3217 | return floor($arguments); |
---|
3218 | } |
---|
3219 | |
---|
3220 | /** |
---|
3221 | * Handles the XPath function ceiling. |
---|
3222 | * |
---|
3223 | * This method handles the XPath function ceiling. |
---|
3224 | * |
---|
3225 | * @access private |
---|
3226 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
3227 | * @param string $node Full path of the node on which the function |
---|
3228 | * should be processed. |
---|
3229 | * @param string $arguments String containing the arguments that were |
---|
3230 | * passed to the function. |
---|
3231 | * @return mixed Depending on the type of function being processed this |
---|
3232 | * method returns different types. |
---|
3233 | * @see evaluate() |
---|
3234 | */ |
---|
3235 | function handle_function_ceiling ( $node, $arguments ) |
---|
3236 | { |
---|
3237 | // Trim the arguments. |
---|
3238 | $arguments = trim($arguments); |
---|
3239 | |
---|
3240 | // Convert the arguments to a number. |
---|
3241 | $arguments = doubleval($arguments); |
---|
3242 | |
---|
3243 | // Return the result |
---|
3244 | return ceil($arguments); |
---|
3245 | } |
---|
3246 | |
---|
3247 | /** |
---|
3248 | * Handles the XPath function round. |
---|
3249 | * |
---|
3250 | * This method handles the XPath function round. |
---|
3251 | * |
---|
3252 | * @access private |
---|
3253 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
3254 | * @param string $node Full path of the node on which the function |
---|
3255 | * should be processed. |
---|
3256 | * @param string $arguments String containing the arguments that were |
---|
3257 | * passed to the function. |
---|
3258 | * @return mixed Depending on the type of function being processed this |
---|
3259 | * method returns different types. |
---|
3260 | * @see evaluate() |
---|
3261 | */ |
---|
3262 | function handle_function_round ( $node, $arguments ) |
---|
3263 | { |
---|
3264 | // Trim the arguments. |
---|
3265 | $arguments = trim($arguments); |
---|
3266 | |
---|
3267 | // Convert the arguments to a number. |
---|
3268 | $arguments = doubleval($arguments); |
---|
3269 | |
---|
3270 | // Return the result |
---|
3271 | return round($arguments); |
---|
3272 | } |
---|
3273 | |
---|
3274 | /** |
---|
3275 | * Handles the XPath function text. |
---|
3276 | * |
---|
3277 | * This method handles the XPath function text. |
---|
3278 | * |
---|
3279 | * @access private |
---|
3280 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
3281 | * @param string $node Full path of the node on which the function |
---|
3282 | * should be processed. |
---|
3283 | * @param string $arguments String containing the arguments that were |
---|
3284 | * passed to the function. |
---|
3285 | * @return mixed Depending on the type of function being processed this |
---|
3286 | * method returns different types. |
---|
3287 | * @see evaluate() |
---|
3288 | */ |
---|
3289 | function handle_function_text ( $node, $arguments ) |
---|
3290 | { |
---|
3291 | // Return the character data of the node. |
---|
3292 | return $this->nodes[$node]["text"]; |
---|
3293 | } |
---|
3294 | |
---|
3295 | /** |
---|
3296 | * Retrieves a substring before a delimiter. |
---|
3297 | * |
---|
3298 | * This method retrieves everything from a string before a given delimiter, |
---|
3299 | * not including the delimiter. |
---|
3300 | * |
---|
3301 | * @access private |
---|
3302 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
3303 | * @param string $string String, from which the substring should be |
---|
3304 | * extracted. |
---|
3305 | * @param string $delimiter String containing the delimiter to use. |
---|
3306 | * @return string Substring from the original string before the |
---|
3307 | * delimiter. |
---|
3308 | * @see afterstr() |
---|
3309 | */ |
---|
3310 | function prestr ( $string, $delimiter ) |
---|
3311 | { |
---|
3312 | // Return the substring. |
---|
3313 | return substr($string, 0, strlen($string) - strlen(strstr($string, |
---|
3314 | "$delimiter"))); |
---|
3315 | } |
---|
3316 | |
---|
3317 | /** |
---|
3318 | * Retrieves a substring after a delimiter. |
---|
3319 | * |
---|
3320 | * This method retrieves everything from a string after a given delimiter, |
---|
3321 | * not including the delimiter. |
---|
3322 | * |
---|
3323 | * @access private |
---|
3324 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
3325 | * @param string $string String, from which the substring should be |
---|
3326 | * extracted. |
---|
3327 | * @param string $delimiter String containing the delimiter to use. |
---|
3328 | * @return string Substring from the original string after the |
---|
3329 | * delimiter. |
---|
3330 | * @see prestr() |
---|
3331 | */ |
---|
3332 | function afterstr ( $string, $delimiter ) |
---|
3333 | { |
---|
3334 | // Return the substring. |
---|
3335 | return substr($string, |
---|
3336 | strpos($string, $delimiter) + strlen($delimiter)); |
---|
3337 | } |
---|
3338 | |
---|
3339 | /** |
---|
3340 | * Displays an error message. |
---|
3341 | * |
---|
3342 | * This method displays an error messages and stops the execution of the |
---|
3343 | * script. This method is called exactly in the same way as the printf |
---|
3344 | * function. The first argument contains the message and additional |
---|
3345 | * arguments of various types may be passed to this method to be inserted |
---|
3346 | * into the message. |
---|
3347 | * |
---|
3348 | * @access private |
---|
3349 | * @author Michael P. Mehl <mpm@phpxml.org> |
---|
3350 | * @param string $message Error message to be displayed. |
---|
3351 | */ |
---|
3352 | function display_error ( $message ) |
---|
3353 | { |
---|
3354 | // Check whether more than one argument was given. |
---|
3355 | if ( func_num_args() > 1 ) |
---|
3356 | { |
---|
3357 | // Read all arguments. |
---|
3358 | $arguments = func_get_args(); |
---|
3359 | |
---|
3360 | // Create a new string for the inserting command. |
---|
3361 | $command = "\$message = sprintf(\$message, "; |
---|
3362 | |
---|
3363 | // Run through the array of arguments. |
---|
3364 | for ( $i = 1; $i < sizeof($arguments); $i++ ) |
---|
3365 | { |
---|
3366 | // Add the number of the argument to the command. |
---|
3367 | $command .= "\$arguments[".$i."], "; |
---|
3368 | } |
---|
3369 | |
---|
3370 | // Replace the last separator. |
---|
3371 | $command = eregi_replace(", $", ");", $command); |
---|
3372 | |
---|
3373 | // Execute the command. |
---|
3374 | eval($command); |
---|
3375 | } |
---|
3376 | |
---|
3377 | // Display the error message. |
---|
3378 | echo "<b>phpXML error:</b> ".$message; |
---|
3379 | |
---|
3380 | // End the execution of this script. |
---|
3381 | exit; |
---|
3382 | } |
---|
3383 | } |
---|
3384 | |
---|
3385 | ?> |
---|