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163
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1 using Implab;
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2 using System;
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3 using System.Collections.Generic;
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4 using System.Globalization;
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5 using System.IO;
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6 using System.Xml;
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7
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180
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8 namespace Implab.Formats.JSON {
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163
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9 public class JSONXmlReader : XmlReader {
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10
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11 enum ValueContext {
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12 Undefined,
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13 ElementStart,
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14 ElementValue,
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15 ElementEnd,
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16 ElementEmpty
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17 }
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18
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19 struct LocalNameContext {
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20 public string localName;
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21 public bool isArray;
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22 }
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23
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24 JSONParser m_parser;
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25 ValueContext m_valueContext;
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26 ReadState m_state = ReadState.Initial;
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27 Stack<LocalNameContext> m_localNameStack = new Stack<LocalNameContext>();
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28 LocalNameContext m_localName;
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180
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29 int m_depthCorrection;
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163
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30
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31 readonly string m_rootName;
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32 readonly string m_prefix;
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33 readonly string m_namespaceUri;
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34 readonly bool m_flattenArrays;
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35 readonly string m_arrayItemName;
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36 readonly XmlNameTable m_nameTable;
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37
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38 JSONXmlReader(JSONParser parser, JSONXmlReaderOptions options) {
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39 m_parser = parser;
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40
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41 if (options != null) {
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42 m_prefix = options.NodesPrefix ?? String.Empty;
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43 m_namespaceUri = options.NamespaceURI ?? String.Empty;
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44 m_rootName = options.RootName ?? "json";
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45 m_flattenArrays = options.FlattenArrays;
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46 m_arrayItemName = options.ArrayItemName ?? "item";
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47 m_nameTable = options.NameTable ?? new NameTable();
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48 } else {
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49 m_prefix = String.Empty;
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50 m_namespaceUri = String.Empty;
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51 m_rootName = "json";
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52 m_flattenArrays = false;
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53 m_arrayItemName = "item";
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54 m_nameTable = new NameTable();
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55 }
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56 }
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57
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58 /// <summary>
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59 /// Always 0, JSON doesn't support attributes
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60 /// </summary>
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61 public override int AttributeCount {
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62 get { return 0; }
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63 }
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64
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65 public override string BaseURI {
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66 get { return String.Empty; }
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67 }
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68
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69 public override int Depth {
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70 get {
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71 return m_localNameStack.Count + m_depthCorrection;
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72 }
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73 }
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74
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75 public override bool EOF {
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76 get { return m_parser.EOF; }
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77 }
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78
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79 /// <summary>
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80 /// Always throws an exception
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81 /// </summary>
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82 /// <param name="i"></param>
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83 /// <returns></returns>
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84 public override string GetAttribute(int i) {
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85 throw new ArgumentOutOfRangeException();
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86 }
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87
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88 /// <summary>
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89 /// Always returns empty string
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90 /// </summary>
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91 /// <param name="name"></param>
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92 /// <param name="namespaceURI"></param>
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93 /// <returns></returns>
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94 public override string GetAttribute(string name, string namespaceURI) {
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95 return String.Empty;
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96 }
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97
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98 /// <summary>
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99 /// Always returns empty string
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100 /// </summary>
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101 /// <param name="name"></param>
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102 /// <returns></returns>
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103 public override string GetAttribute(string name) {
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104 return String.Empty;
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105 }
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106
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107 public override bool IsEmptyElement {
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108 get { return m_parser.ElementType == JSONElementType.Value && m_valueContext == ValueContext.ElementEmpty; }
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109 }
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110
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111 public override string LocalName {
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112 get { return m_localName.localName; }
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113 }
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114
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115 public override string LookupNamespace(string prefix) {
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116 if (String.IsNullOrEmpty(prefix) || prefix == m_prefix)
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117 return m_namespaceUri;
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180
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118
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119 return String.Empty;
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163
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120 }
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121
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122 public override bool MoveToAttribute(string name, string ns) {
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123 return false;
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124 }
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125
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126 public override bool MoveToAttribute(string name) {
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127 return false;
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128 }
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129
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130 public override bool MoveToElement() {
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131 return false;
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132 }
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133
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134 public override bool MoveToFirstAttribute() {
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135 return false;
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136 }
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137
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138 public override bool MoveToNextAttribute() {
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139 return false;
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140 }
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141
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142 public override XmlNameTable NameTable {
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143 get { return m_nameTable; }
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144 }
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145
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146 public override string NamespaceURI {
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147 get { return m_namespaceUri; }
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148 }
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149
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150 public override XmlNodeType NodeType {
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151 get {
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152 switch (m_parser.ElementType) {
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153 case JSONElementType.BeginObject:
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154 case JSONElementType.BeginArray:
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155 return XmlNodeType.Element;
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156 case JSONElementType.EndObject:
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157 case JSONElementType.EndArray:
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158 return XmlNodeType.EndElement;
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159 case JSONElementType.Value:
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160 switch (m_valueContext) {
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161 case ValueContext.ElementStart:
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162 case ValueContext.ElementEmpty:
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163 return XmlNodeType.Element;
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164 case ValueContext.ElementValue:
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165 return XmlNodeType.Text;
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166 case ValueContext.ElementEnd:
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167 return XmlNodeType.EndElement;
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168 default:
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169 throw new InvalidOperationException();
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170 }
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171 default:
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172 throw new InvalidOperationException();
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173 }
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174 }
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175 }
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176
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177 public override string Prefix {
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178 get { return m_prefix; }
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179 }
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180
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181 public override bool Read() {
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180
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182 if (m_state != ReadState.Interactive && m_state != ReadState.Initial)
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163
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183 return false;
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184
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185 if (m_state == ReadState.Initial)
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180
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186 m_state = ReadState.Interactive;
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163
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187
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188 try {
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189 switch (m_parser.ElementType) {
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190 case JSONElementType.Value:
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191 switch (m_valueContext) {
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192 case ValueContext.ElementStart:
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193 SetLocalName(String.Empty);
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194 m_valueContext = ValueContext.ElementValue;
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195 return true;
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196 case ValueContext.ElementValue:
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197 RestoreLocalName();
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198 m_valueContext = ValueContext.ElementEnd;
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199 return true;
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200 case ValueContext.ElementEmpty:
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201 case ValueContext.ElementEnd:
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202 RestoreLocalName();
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203 break;
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204 }
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205 break;
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206 case JSONElementType.EndArray:
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207 case JSONElementType.EndObject:
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208 RestoreLocalName();
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209 break;
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210 }
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211 string itemName = m_parser.ElementType == JSONElementType.None ? m_rootName : m_flattenArrays ? m_localName.localName : m_arrayItemName;
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212 while (m_parser.Read()) {
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213 if (!String.IsNullOrEmpty(m_parser.ElementName))
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214 itemName = m_parser.ElementName;
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215
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216 switch (m_parser.ElementType) {
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217 case JSONElementType.BeginArray:
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218 if (m_flattenArrays && !m_localName.isArray) {
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219 m_depthCorrection--;
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220 SetLocalName(itemName, true);
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221 continue;
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222 }
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180
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223 SetLocalName(itemName, true);
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163
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224 break;
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225 case JSONElementType.BeginObject:
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226 SetLocalName(itemName);
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227 break;
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228 case JSONElementType.EndArray:
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229 if (m_flattenArrays && !m_localNameStack.Peek().isArray) {
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230 RestoreLocalName();
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231 m_depthCorrection++;
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232 continue;
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233 }
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234 break;
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235 case JSONElementType.EndObject:
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236 break;
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237 case JSONElementType.Value:
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238 SetLocalName(itemName);
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239 m_valueContext = m_parser.ElementValue == null ? ValueContext.ElementEmpty : ValueContext.ElementStart;
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240 break;
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241 }
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242 return true;
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243 }
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244
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180
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245 m_state = ReadState.EndOfFile;
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163
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246 return false;
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247 } catch {
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180
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248 m_state = ReadState.Error;
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163
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249 throw;
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250 }
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251 }
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252
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253 public override bool ReadAttributeValue() {
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254 return false;
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255 }
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256
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257 public override ReadState ReadState {
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258 get { return m_state; }
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259 }
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260
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261 public override void ResolveEntity() {
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262 // do nothing
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263 }
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264
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265 public override string Value {
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266 get {
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267 if (m_parser.ElementValue == null)
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268 return String.Empty;
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269 if (Convert.GetTypeCode(m_parser.ElementValue) == TypeCode.Double)
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270 return ((double)m_parser.ElementValue).ToString(CultureInfo.InvariantCulture);
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180
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271 return m_parser.ElementValue.ToString();
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163
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272 }
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273 }
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274
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275 void SetLocalName(string name) {
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276 m_localNameStack.Push(m_localName);
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277 m_localName.localName = name;
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278 m_localName.isArray = false;
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279 }
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280
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281 void SetLocalName(string name, bool isArray) {
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282 m_localNameStack.Push(m_localName);
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283 m_localName.localName = name;
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284 m_localName.isArray = isArray;
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285 }
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286
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287 void RestoreLocalName() {
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288 m_localName = m_localNameStack.Pop();
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289 }
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290
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291 public override void Close() {
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292
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293 }
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294
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295 protected override void Dispose(bool disposing) {
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296 #if MONO
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297 disposing = true;
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298 #endif
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299 if (disposing) {
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300 m_parser.Dispose();
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301 }
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302 base.Dispose(disposing);
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303 }
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304
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305 public static JSONXmlReader Create(string file, JSONXmlReaderOptions options) {
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306 return Create(File.OpenText(file), options);
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307 }
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308
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309 /// <summary>
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310 /// Creates the XmlReader for the specified text stream with JSON data.
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311 /// </summary>
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312 /// <param name="reader">Text reader.</param>
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313 /// <param name="options">Options.</param>
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314 /// <remarks>
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315 /// The reader will be disposed when the XmlReader is disposed.
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316 /// </remarks>
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317 public static JSONXmlReader Create(TextReader reader, JSONXmlReaderOptions options) {
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180
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318 return new JSONXmlReader(new JSONParser(reader), options);
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163
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319 }
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320
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321 /// <summary>
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322 /// Creates the XmlReader for the specified stream with JSON data.
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323 /// </summary>
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324 /// <param name="stream">Stream.</param>
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325 /// <param name="options">Options.</param>
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326 /// <remarks>
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327 /// The stream will be disposed when the XmlReader is disposed.
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328 /// </remarks>
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329 public static JSONXmlReader Create(Stream stream, JSONXmlReaderOptions options) {
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330 Safe.ArgumentNotNull(stream, "stream");
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331 // HACK don't dispose StreaReader to keep stream opened
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332 return Create(new StreamReader(stream), options);
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333 }
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334 }
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335 }
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