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