Mercurial > repos > IBBoard

annotate Xml/XmlTools.cs @ 81:09f71d10c249

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* Fix documentation - we're now using ISO codes (or should be, although we do handle invalid ones) no-open-ticket
author IBBoard <dev@ibboard.co.uk>
date Sun, 18 Apr 2010 14:09:16 +0000
parents 8fe11cd7d3bf
children 7ca4acc659bb de0ed24eb961
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1 // This file (XmlTools.cs) is a part of the IBBoard library and is copyright 2009 IBBoard
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2 //
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3 // The file and the library/program it is in are licensed under the GNU LGPL license, either version 3 of the License or (at your option) any later version. Please see COPYING.LGPL for more information and the full license.
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4 //
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5
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6 using System;
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7 using System.Globalization;
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8 using System.Text.RegularExpressions;
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9 using System.Xml;
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10
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11 namespace IBBoard.Xml
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12 {
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13 /// <summary>
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14 /// Some basic tools for handling XML files and retrieving their values
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15 /// </summary>
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16 public class XmlTools
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17 {
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18 private static Regex idRegex;
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19 private static Regex multiUnderscoreRegex;
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20 private static NumberFormatInfo doubleFormat;
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21
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22 /// <summary>
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23 /// Gets the value of an attribute of an element as a boolean. Throws a FormatException if the attribute is not a boolean.
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24 /// </summary>
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25 /// <param name="elem">
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26 /// The <see cref="XmlElement"/> to get the attribute value of
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27 /// </param>
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28 /// <param name="attributeName">
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29 /// The name of the attribute to get as a boolean
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30 /// </param>
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31 /// <returns>
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32 /// The value of the attribute as an boolean
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33 /// </returns>
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34 public static bool GetBoolValueFromAttribute(XmlElement elem, string attributeName)
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35 {
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36 try
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37 {
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38 return bool.Parse(elem.GetAttribute(attributeName));
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39 }
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40 catch(FormatException)
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41 {
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42 throw new FormatException(String.Format("Attribute '{0}' of {1} with ID {2} was not a valid boolean", attributeName, elem.Name, elem.GetAttribute("id")));
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43 }
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44 }
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45
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46 /// <summary>
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47 /// Gets the value of an attribute of an element as an integer. Throws a FormatException if the attribute is not an integer.
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48 /// </summary>
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49 /// <param name="elem">
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50 /// The <see cref="XmlElement"/> to get the attribute value of
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51 /// </param>
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52 /// <param name="attributeName">
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53 /// The name of the attribute to get as an integer
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54 /// </param>
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55 /// <returns>
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56 /// The value of the attribute as an integer
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57 /// </returns>
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58 public static int GetIntValueFromAttribute(XmlElement elem, string attributeName)
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59 {
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60 try
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61 {
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62 return int.Parse(elem.GetAttribute(attributeName));
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63 }
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64 catch(FormatException)
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65 {
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66 throw new FormatException(String.Format("Attribute '{0}' of {1} with ID {2} was not a valid number", attributeName, elem.Name, elem.GetAttribute("id")));
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67 }
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68 }
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69
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70 /// <summary>
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71 /// Gets the value of an attribute of an element as a double. Throws a FormatException if the attribute is not a double.
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72 /// </summary>
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73 /// <param name="elem">
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74 /// The <see cref="XmlElement"/> to get the attribute value of
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75 /// </param>
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76 /// <param name="attributeName">
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77 /// The name of the attribute to get as a double
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78 /// </param>
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79 /// <returns>
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80 /// The value of the attribute as an double
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81 /// </returns>
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82 public static double GetDoubleValueFromAttribute(XmlElement elem, string attributeName)
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83 {
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84 double doubleVal = double.NaN;
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85 string attribValue = elem.GetAttribute(attributeName);
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86
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87 if (attribValue == "INF")
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88 {
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89 doubleVal = double.PositiveInfinity;
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90 }
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91 else
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92 {
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93 try
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94 {
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95 return double.Parse(attribValue, GetNumberFormatInfo());
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96 }
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97 catch(FormatException)
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98 {
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99 throw new FormatException(String.Format("Attribute '{0}' of {1} with ID {2} was not a valid number", attributeName, elem.Name, elem.GetAttribute("id")));
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100 }
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101 }
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102
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103 return doubleVal;
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104 }
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105
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106 public static T GetEnumValueFromAttribute<T>(XmlElement elem, string attributeName)
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107 {
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108 return GetEnumValueFromAttribute<T>(elem, attributeName, true);
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109 }
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110
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111 public static T GetEnumValueFromAttribute<T>(XmlElement elem, string attributeName, bool ignoreCase)
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112 {
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113 string attribValue = elem.GetAttribute (attributeName);
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114
62
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115 try
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116 {
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117 return EnumTools.ParseEnum<T>(attribValue, ignoreCase);
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118 }
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119 catch(ArgumentException)
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120 {
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121 throw new FormatException(String.Format("Attribute '{0}' with value {1} for {2} with ID '{3}' was not a valid {4} enum", attributeName, attribValue, elem.Name, elem.GetAttribute("id"), typeof(T).Name));
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122 }
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123 }
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124
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125 private static NumberFormatInfo GetNumberFormatInfo()
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126 {
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127 if (doubleFormat == null)
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128 {
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129 doubleFormat = NumberFormatInfo.InvariantInfo;
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130 }
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131
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132 return doubleFormat;
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133 }
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134
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135 private static Regex GetIdRegex()
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136 {
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137 if (idRegex == null)
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138 {
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139 idRegex = new Regex("[^a-zA-Z0-9:\\._-]+");
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140 }
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141
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142 return idRegex;
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143 }
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144
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145 private static Regex GetMultiUnderscoreRegex()
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146 {
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147 if (multiUnderscoreRegex == null)
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148 {
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149 multiUnderscoreRegex = new Regex("_{2,}");
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150 }
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151
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152 return multiUnderscoreRegex;
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153 }
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154
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155 /// <summary>
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156 /// Gets a valid XML ID for a given string that does not contain accented and non-ASCII characters. Matches the allowed characters
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157 /// in the XML spec (http://www.w3.org/TR/xml/#NT-NameStartChar) where the characters do not use Unicode character codes. If the ID
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158 /// starts with an invalid character then it will be prepended with an underscore.
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159 /// </summary>
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160 /// <param name="str">
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161 /// The <see cref="System.String"/> to turn in to a valid ID
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162 /// </param>
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163 /// <returns>
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164 /// The valid XML ID with all series of invalid characters replaced with an underscore
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165 /// </returns>
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166 public static string GetAsciiXmlIdForString(string str)
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167 {
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168 string id = GetIdRegex().Replace(str, "_");
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169 id = GetMultiUnderscoreRegex().Replace(id, "_");
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170
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171 if (!IdStartsWithValidCharacter(id))
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172 {
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173 id = "_" + id;
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174 }
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175
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176 return id;
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177 }
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178
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179 private static bool IdStartsWithValidCharacter(string id)
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180 {
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181 bool valid = false;
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182
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183 if (id.Length > 0)
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184 {
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185 char firstChar = id[0];
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186 valid = ('A' <= firstChar && firstChar <= 'Z') || ('a' <= firstChar && firstChar <= 'z') || firstChar == '_' || firstChar == ':';
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187 }
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188
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189 return valid;
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190 }
24
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191 }
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192 }