@@ -1,310 +1,322 | |||
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1 | 1 | using Implab; |
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2 | 2 | using Implab.Parsing; |
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3 | 3 | using System; |
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4 | 4 | using System.Collections.Generic; |
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5 | using System.Globalization; | |
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5 | 6 | using System.IO; |
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6 | 7 | using System.Linq; |
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7 | 8 | using System.Text; |
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8 | 9 | using System.Threading.Tasks; |
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9 | 10 | using System.Xml; |
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10 | 11 | |
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11 | 12 | namespace Implab.JSON { |
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12 | 13 | public class JSONXmlReader : XmlReader { |
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13 | 14 | |
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14 | 15 | enum ValueContext { |
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15 | 16 | Undefined, |
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16 | 17 | ElementStart, |
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17 | 18 | ElementValue, |
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18 | 19 | ElementEnd, |
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19 | 20 | ElementEmpty |
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20 | 21 | } |
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21 | 22 | |
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22 | 23 | struct LocalNameContext { |
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23 | 24 | public string localName; |
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24 | 25 | public bool isArray; |
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25 | 26 | } |
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26 | 27 | |
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27 | 28 | JSONParser m_parser; |
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28 | 29 | ValueContext m_valueContext; |
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29 | 30 | ReadState m_state = ReadState.Initial; |
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30 | 31 | Stack<LocalNameContext> m_localNameStack = new Stack<LocalNameContext>(); |
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31 | 32 | LocalNameContext m_localName; |
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32 | 33 | int m_depthCorrection = 0; |
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33 | 34 | |
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34 | 35 | readonly string m_rootName; |
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35 | 36 | readonly string m_prefix; |
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36 | 37 | readonly string m_namespaceUri; |
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37 | 38 | readonly bool m_flattenArrays; |
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38 | 39 | readonly string m_arrayItemName; |
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39 | 40 | readonly XmlNameTable m_nameTable; |
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41 | readonly bool m_disposeParser; | |
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40 | 42 | |
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41 | 43 | public JSONXmlReader(JSONParser parser, JSONXmlReaderOptions options) { |
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42 | 44 | Safe.ArgumentNotNull(parser, "parser"); |
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43 | 45 | m_parser = parser; |
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44 | 46 | |
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45 | 47 | if (options != null) { |
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46 | 48 | m_prefix = options.NodesPrefix ?? String.Empty; |
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47 | 49 | m_namespaceUri = options.NamespaceURI ?? String.Empty; |
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48 | 50 | m_rootName = options.RootName ?? "json"; |
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49 | 51 | m_flattenArrays = options.FlattenArrays; |
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50 | 52 | m_arrayItemName = options.ArrayItemName ?? "item"; |
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51 | 53 | m_nameTable = options.NameTable ?? new NameTable(); |
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54 | m_disposeParser = options.DisposeParser; | |
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52 | 55 | } else { |
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53 | 56 | m_prefix = String.Empty; |
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54 | 57 | m_namespaceUri = String.Empty; |
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55 | 58 | m_rootName = "json"; |
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56 | 59 | m_flattenArrays = false; |
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57 | 60 | m_arrayItemName = "item"; |
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58 | 61 | m_nameTable = new NameTable(); |
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62 | m_disposeParser = false; | |
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59 | 63 | } |
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60 | 64 | } |
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61 | 65 | |
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62 | 66 | /// <summary> |
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63 | 67 | /// Always 0, JSON doesn't support attributes |
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64 | 68 | /// </summary> |
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65 | 69 | public override int AttributeCount { |
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66 | 70 | get { return 0; } |
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67 | 71 | } |
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68 | 72 | |
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69 | 73 | public override string BaseURI { |
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70 | 74 | get { return String.Empty; } |
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71 | 75 | } |
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72 | 76 | |
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73 | 77 | public override int Depth { |
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74 | 78 | get { |
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75 | 79 | return m_localNameStack.Count+m_depthCorrection; |
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76 | 80 | } |
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77 | 81 | } |
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78 | 82 | |
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79 | 83 | public override bool EOF { |
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80 | 84 | get { return m_parser.EOF; } |
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81 | 85 | } |
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82 | 86 | |
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83 | 87 | /// <summary> |
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84 | 88 | /// Always throws an exception |
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85 | 89 | /// </summary> |
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86 | 90 | /// <param name="i"></param> |
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87 | 91 | /// <returns></returns> |
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88 | 92 | public override string GetAttribute(int i) { |
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89 | 93 | throw new ArgumentOutOfRangeException(); |
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90 | 94 | } |
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91 | 95 | |
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92 | 96 | /// <summary> |
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93 | 97 | /// Always returns empty string |
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94 | 98 | /// </summary> |
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95 | 99 | /// <param name="name"></param> |
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96 | 100 | /// <param name="namespaceURI"></param> |
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97 | 101 | /// <returns></returns> |
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98 | 102 | public override string GetAttribute(string name, string namespaceURI) { |
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99 | 103 | return String.Empty; |
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100 | 104 | } |
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101 | 105 | |
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102 | 106 | /// <summary> |
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103 | 107 | /// Always returns empty string |
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104 | 108 | /// </summary> |
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105 | 109 | /// <param name="name"></param> |
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106 | 110 | /// <returns></returns> |
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107 | 111 | public override string GetAttribute(string name) { |
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108 | 112 | return String.Empty; |
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109 | 113 | } |
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110 | 114 | |
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111 | 115 | public override bool IsEmptyElement { |
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112 | 116 | get { return m_parser.ElementType == JSONElementType.Value && m_valueContext == ValueContext.ElementEmpty; } |
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113 | 117 | } |
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114 | 118 | |
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115 | 119 | public override string LocalName { |
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116 | 120 | get { return m_localName.localName; } |
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117 | 121 | } |
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118 | 122 | |
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119 | 123 | public override string LookupNamespace(string prefix) { |
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120 | 124 | if (String.IsNullOrEmpty(prefix) || prefix == m_prefix) |
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121 | 125 | return m_namespaceUri; |
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122 | 126 | else |
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123 | 127 | return String.Empty; |
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124 | 128 | } |
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125 | 129 | |
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126 | 130 | public override bool MoveToAttribute(string name, string ns) { |
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127 | 131 | return false; |
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128 | 132 | } |
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129 | 133 | |
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130 | 134 | public override bool MoveToAttribute(string name) { |
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131 | 135 | return false; |
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132 | 136 | } |
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133 | 137 | |
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134 | 138 | public override bool MoveToElement() { |
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135 | 139 | return false; |
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136 | 140 | } |
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137 | 141 | |
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138 | 142 | public override bool MoveToFirstAttribute() { |
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139 | 143 | return false; |
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140 | 144 | } |
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141 | 145 | |
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142 | 146 | public override bool MoveToNextAttribute() { |
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143 | 147 | return false; |
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144 | 148 | } |
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145 | 149 | |
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146 | 150 | public override XmlNameTable NameTable { |
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147 | 151 | get { return m_nameTable; } |
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148 | 152 | } |
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149 | 153 | |
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150 | 154 | public override string NamespaceURI { |
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151 | 155 | get { return m_namespaceUri; } |
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152 | 156 | } |
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153 | 157 | |
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154 | 158 | public override XmlNodeType NodeType { |
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155 | 159 | get { |
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156 | 160 | switch (m_parser.ElementType) { |
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157 | 161 | case JSONElementType.BeginObject: |
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158 | 162 | case JSONElementType.BeginArray: |
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159 | 163 | return XmlNodeType.Element; |
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160 | 164 | case JSONElementType.EndObject: |
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161 | 165 | case JSONElementType.EndArray: |
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162 | 166 | return XmlNodeType.EndElement; |
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163 | 167 | case JSONElementType.Value: |
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164 | 168 | switch (m_valueContext) { |
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165 | 169 | case ValueContext.ElementStart: |
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166 | 170 | case ValueContext.ElementEmpty: |
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167 | 171 | return XmlNodeType.Element; |
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168 | 172 | case ValueContext.ElementValue: |
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169 | 173 | return XmlNodeType.Text; |
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170 | 174 | case ValueContext.ElementEnd: |
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171 | 175 | return XmlNodeType.EndElement; |
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172 | 176 | default: |
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173 | 177 | throw new InvalidOperationException(); |
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174 | 178 | } |
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175 | 179 | default: |
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176 | 180 | throw new InvalidOperationException(); |
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177 | 181 | } |
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178 | 182 | } |
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179 | 183 | } |
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180 | 184 | |
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181 | 185 | public override string Prefix { |
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182 | 186 | get { return m_prefix; } |
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183 | 187 | } |
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184 | 188 | |
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185 | 189 | public override bool Read() { |
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186 | 190 | if (m_state != System.Xml.ReadState.Interactive && m_state != System.Xml.ReadState.Initial) |
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187 | 191 | return false; |
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188 | 192 | |
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189 | 193 | if (m_state == ReadState.Initial) |
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190 | 194 | m_state = System.Xml.ReadState.Interactive; |
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191 | 195 | |
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192 | 196 | try { |
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193 | 197 | switch (m_parser.ElementType) { |
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194 | 198 | case JSONElementType.Value: |
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195 | 199 | switch (m_valueContext) { |
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196 | 200 | case ValueContext.ElementStart: |
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197 | 201 | SetLocalName(String.Empty); |
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198 | 202 | m_valueContext = ValueContext.ElementValue; |
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199 | 203 | return true; |
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200 | 204 | case ValueContext.ElementValue: |
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201 | 205 | RestoreLocalName(); |
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202 | 206 | m_valueContext = ValueContext.ElementEnd; |
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203 | 207 | return true; |
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204 | 208 | case ValueContext.ElementEmpty: |
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205 | 209 | case ValueContext.ElementEnd: |
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206 | 210 | RestoreLocalName(); |
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207 | 211 | break; |
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208 | 212 | } |
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209 | 213 | break; |
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210 | 214 | case JSONElementType.EndArray: |
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211 | 215 | case JSONElementType.EndObject: |
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212 | 216 | RestoreLocalName(); |
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213 | 217 | break; |
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214 | 218 | } |
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215 | 219 | string itemName = m_parser.ElementType == JSONElementType.None ? m_rootName : m_flattenArrays ? m_localName.localName : m_arrayItemName; |
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216 | 220 | while (m_parser.Read()) { |
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217 | 221 | if (!String.IsNullOrEmpty(m_parser.ElementName)) |
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218 | 222 | itemName = m_parser.ElementName; |
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219 | 223 | |
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220 | 224 | switch (m_parser.ElementType) { |
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221 | 225 | case JSONElementType.BeginArray: |
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222 | 226 | if (m_flattenArrays && !m_localName.isArray) { |
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223 | 227 | m_depthCorrection--; |
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224 | 228 | SetLocalName(itemName, true); |
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225 | 229 | continue; |
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226 | 230 | } else { |
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227 | 231 | SetLocalName(itemName, true); |
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228 | 232 | } |
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229 | 233 | break; |
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230 | 234 | case JSONElementType.BeginObject: |
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231 | 235 | SetLocalName(itemName); |
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232 | 236 | break; |
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233 | 237 | case JSONElementType.EndArray: |
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234 | 238 | if (m_flattenArrays && !m_localNameStack.Peek().isArray) { |
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235 | 239 | RestoreLocalName(); |
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236 | 240 | m_depthCorrection++; |
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237 | 241 | continue; |
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238 | 242 | } |
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239 | 243 | break; |
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240 | 244 | case JSONElementType.EndObject: |
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241 | 245 | break; |
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242 | 246 | case JSONElementType.Value: |
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243 | 247 | SetLocalName(itemName); |
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244 | 248 | m_valueContext = m_parser.ElementValue == null ? ValueContext.ElementEmpty : ValueContext.ElementStart; |
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245 | 249 | break; |
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246 | 250 | default: |
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247 | 251 | break; |
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248 | 252 | } |
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249 | 253 | return true; |
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250 | 254 | } |
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251 | 255 | |
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252 | 256 | m_state = System.Xml.ReadState.EndOfFile; |
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253 | 257 | return false; |
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254 | 258 | } catch { |
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255 | 259 | m_state = System.Xml.ReadState.Error; |
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256 | 260 | throw; |
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257 | 261 | } |
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258 | 262 | } |
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259 | 263 | |
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260 | 264 | public override bool ReadAttributeValue() { |
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261 | 265 | return false; |
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262 | 266 | } |
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263 | 267 | |
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264 | 268 | public override ReadState ReadState { |
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265 | 269 | get { return m_state; } |
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266 | 270 | } |
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267 | 271 | |
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268 | 272 | public override void ResolveEntity() { |
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269 | 273 | // do nothing |
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270 | 274 | } |
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271 | 275 | |
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272 | 276 | public override string Value { |
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273 | get { return m_parser.ElementValue == null ? String.Empty : m_parser.ElementValue.ToString(); } | |
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277 | get { | |
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278 | if (m_parser.ElementValue == null) | |
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279 | return String.Empty; | |
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280 | if (Convert.GetTypeCode(m_parser.ElementValue) == TypeCode.Double) | |
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281 | return ((double)m_parser.ElementValue).ToString(CultureInfo.InvariantCulture); | |
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282 | else | |
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283 | return (string)m_parser.ElementValue; | |
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284 | } | |
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274 | 285 | } |
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275 | 286 | |
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276 | 287 | void SetLocalName(string name) { |
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277 | 288 | m_localNameStack.Push(m_localName); |
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278 | 289 | m_localName.localName = name; |
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279 | 290 | m_localName.isArray = false; |
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280 | 291 | } |
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281 | 292 | |
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282 | 293 | void SetLocalName(string name, bool isArray) { |
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283 | 294 | m_localNameStack.Push(m_localName); |
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284 | 295 | m_localName.localName = name; |
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285 | 296 | m_localName.isArray = isArray; |
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286 | 297 | } |
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287 | 298 | |
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288 | 299 | void RestoreLocalName() { |
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289 | 300 | m_localName = m_localNameStack.Pop(); |
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290 | 301 | } |
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291 | 302 | |
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292 | 303 | public override void Close() { |
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293 | 304 | |
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294 | 305 | } |
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295 | 306 | |
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296 | 307 | protected override void Dispose(bool disposing) { |
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297 | 308 | if (disposing) { |
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309 | if (m_disposeParser) | |
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298 | 310 | m_parser.Dispose(); |
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299 | 311 | } |
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300 | 312 | base.Dispose(disposing); |
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301 | 313 | } |
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302 | 314 | |
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303 | 315 | |
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304 | 316 | public static JSONXmlReader OpenFile(string file, JSONXmlReaderOptions options) { |
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305 | 317 | var stream = File.OpenText(file); |
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306 | 318 | var parser = new JSONParser(stream, true); |
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307 | 319 | return new JSONXmlReader(parser, options); |
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308 | 320 | } |
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309 | 321 | } |
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310 | 322 | } |
@@ -1,61 +1,69 | |||
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1 | 1 | using System; |
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2 | 2 | using System.Collections.Generic; |
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3 | 3 | using System.Linq; |
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4 | 4 | using System.Text; |
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5 | 5 | using System.Xml; |
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6 | 6 | |
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7 | 7 | namespace Implab.JSON { |
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8 | 8 | /// <summary> |
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9 | 9 | /// Набор необязательных параметров для <see cref="JSONXmlReader"/>, позволяющий управлять процессом |
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10 | 10 | /// интерпретации <c>JSON</c> документа. |
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11 | 11 | /// </summary> |
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12 | 12 | public class JSONXmlReaderOptions { |
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13 | 13 | /// <summary> |
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14 | 14 | /// Пространство имен в котором будут располагаться читаемые элементы документа |
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15 | 15 | /// </summary> |
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16 | 16 | public string NamespaceURI { |
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17 | 17 | get; |
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18 | 18 | set; |
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19 | 19 | } |
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20 | 20 | |
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21 | 21 | /// <summary> |
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22 | 22 | /// Интерпретировать массивы как множественные элементы (убирает один уровень вложенности) |
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23 | 23 | /// </summary> |
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24 | 24 | public bool FlattenArrays { |
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25 | 25 | get; |
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26 | 26 | set; |
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27 | 27 | } |
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28 | 28 | |
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29 | 29 | /// <summary> |
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30 | 30 | /// Префикс, для узлов документа |
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31 | 31 | /// </summary> |
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32 | 32 | public string NodesPrefix { |
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33 | 33 | get; |
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34 | 34 | set; |
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35 | 35 | } |
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36 | 36 | |
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37 | 37 | /// <summary> |
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38 | 38 | /// Имя корневого элемента в xml документе |
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39 | 39 | /// </summary> |
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40 | 40 | public string RootName { |
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41 | 41 | get; |
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42 | 42 | set; |
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43 | 43 | } |
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44 | 44 | |
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45 | 45 | /// <summary> |
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46 | 46 | /// Имя элемента для массивов, если не включена опция <see cref="FlattenArrays"/>. |
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47 | 47 | /// </summary> |
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48 | 48 | public string ArrayItemName { |
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49 | 49 | get; |
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50 | 50 | set; |
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51 | 51 | } |
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52 | 52 | |
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53 | 53 | /// <summary> |
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54 | 54 | /// Таблица атомизированных строк для построения документа. |
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55 | 55 | /// </summary> |
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56 | 56 | public XmlNameTable NameTable { |
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57 | 57 | get; |
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58 | 58 | set; |
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59 | 59 | } |
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60 | ||
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61 | /// <summary> | |
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62 | /// Флаг, означающий, что неужно освободить парсер по окончанию работы. | |
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63 | /// </summary> | |
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64 | public bool DisposeParser { | |
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65 | get; | |
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66 | set; | |
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60 | 67 | } |
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61 | 68 | } |
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69 | } |
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