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58
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1 using Implab;
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2 using Implab.Parsing;
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3 using System;
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4 using System.Collections.Generic;
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60
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5 using System.IO;
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58
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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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60
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11 namespace Implab.JSON {
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58
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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 int m_depthCorrection = 0;
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33
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60
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34 readonly string m_rootName;
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35 readonly string m_prefix;
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36 readonly string m_namespaceUri;
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37 readonly bool m_flattenArrays;
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38 readonly string m_arrayItemName;
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39 readonly XmlNameTable m_nameTable;
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40
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41 public JSONXmlReader(JSONParser parser, JSONXmlReaderOptions options) {
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58
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42 Safe.ArgumentNotNull(parser, "parser");
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43 m_parser = parser;
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60
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44
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45 if (options != null) {
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46 m_prefix = options.NodesPrefix ?? String.Empty;
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47 m_namespaceUri = options.NamespaceURI ?? String.Empty;
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48 m_rootName = options.RootName ?? "json";
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49 m_flattenArrays = options.FlattenArrays;
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50 m_arrayItemName = options.ArrayItemName ?? "item";
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51 m_nameTable = options.NameTable ?? new NameTable();
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52 } else {
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53 m_prefix = String.Empty;
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54 m_namespaceUri = String.Empty;
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55 m_rootName = "json";
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56 m_flattenArrays = false;
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57 m_arrayItemName = "item";
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58 m_nameTable = new NameTable();
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59 }
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58
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60 }
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61
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62 /// <summary>
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63 /// Always 0, JSON doesn't support attributes
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64 /// </summary>
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65 public override int AttributeCount {
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66 get { return 0; }
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67 }
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68
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69 public override string BaseURI {
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70 get { return String.Empty; }
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71 }
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72
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73 public override int Depth {
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74 get {
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75 return m_localNameStack.Count+m_depthCorrection;
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76 }
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77 }
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78
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79 public override bool EOF {
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80 get { return m_parser.EOF; }
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81 }
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82
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83 /// <summary>
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84 /// Always throws an exception
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85 /// </summary>
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86 /// <param name="i"></param>
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87 /// <returns></returns>
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88 public override string GetAttribute(int i) {
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89 throw new ArgumentOutOfRangeException();
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90 }
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91
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92 /// <summary>
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93 /// Always returns empty string
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94 /// </summary>
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95 /// <param name="name"></param>
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96 /// <param name="namespaceURI"></param>
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97 /// <returns></returns>
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98 public override string GetAttribute(string name, string namespaceURI) {
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99 return String.Empty;
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100 }
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101
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102 /// <summary>
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103 /// Always returns empty string
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104 /// </summary>
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105 /// <param name="name"></param>
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106 /// <returns></returns>
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107 public override string GetAttribute(string name) {
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108 return String.Empty;
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109 }
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110
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111 public override bool IsEmptyElement {
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112 get { return m_parser.ElementType == JSONElementType.Value && m_valueContext == ValueContext.ElementEmpty; }
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113 }
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114
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115 public override string LocalName {
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116 get { return m_localName.localName; }
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117 }
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118
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119 public override string LookupNamespace(string prefix) {
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120 if (String.IsNullOrEmpty(prefix) || prefix == m_prefix)
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121 return m_namespaceUri;
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122 else
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123 return String.Empty;
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124 }
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125
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126 public override bool MoveToAttribute(string name, string ns) {
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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 MoveToAttribute(string name) {
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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 MoveToElement() {
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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 MoveToFirstAttribute() {
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139 return false;
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140 }
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141
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142 public override bool MoveToNextAttribute() {
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143 return false;
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144 }
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145
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146 public override XmlNameTable NameTable {
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147 get { return m_nameTable; }
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148 }
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149
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150 public override string NamespaceURI {
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151 get { return m_namespaceUri; }
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152 }
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153
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154 public override XmlNodeType NodeType {
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155 get {
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156 switch (m_parser.ElementType) {
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157 case JSONElementType.BeginObject:
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158 case JSONElementType.BeginArray:
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159 return XmlNodeType.Element;
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160 case JSONElementType.EndObject:
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161 case JSONElementType.EndArray:
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162 return XmlNodeType.EndElement;
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163 case JSONElementType.Value:
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164 switch (m_valueContext) {
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165 case ValueContext.ElementStart:
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166 case ValueContext.ElementEmpty:
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167 return XmlNodeType.Element;
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168 case ValueContext.ElementValue:
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169 return XmlNodeType.Text;
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170 case ValueContext.ElementEnd:
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171 return XmlNodeType.EndElement;
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172 default:
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173 throw new InvalidOperationException();
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174 }
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175 default:
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176 throw new InvalidOperationException();
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177 }
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178 }
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179 }
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180
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181 public override string Prefix {
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182 get { return m_prefix; }
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183 }
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184
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185 public override bool Read() {
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186 if (m_state != System.Xml.ReadState.Interactive && m_state != System.Xml.ReadState.Initial)
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187 return false;
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188
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189 if (m_state == ReadState.Initial)
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190 m_state = System.Xml.ReadState.Interactive;
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191
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192 try {
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193 switch (m_parser.ElementType) {
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194 case JSONElementType.Value:
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195 switch (m_valueContext) {
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196 case ValueContext.ElementStart:
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197 SetLocalName(String.Empty);
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198 m_valueContext = ValueContext.ElementValue;
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199 return true;
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200 case ValueContext.ElementValue:
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201 RestoreLocalName();
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202 m_valueContext = ValueContext.ElementEnd;
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203 return true;
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204 case ValueContext.ElementEmpty:
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205 case ValueContext.ElementEnd:
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206 RestoreLocalName();
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207 break;
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208 }
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209 break;
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210 case JSONElementType.EndArray:
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211 case JSONElementType.EndObject:
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212 RestoreLocalName();
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213 break;
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214 }
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60
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215 string itemName = m_parser.ElementType == JSONElementType.None ? m_rootName : m_flattenArrays ? m_localName.localName : m_arrayItemName;
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58
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216 while (m_parser.Read()) {
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217 if (!String.IsNullOrEmpty(m_parser.ElementName))
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218 itemName = m_parser.ElementName;
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219
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220 switch (m_parser.ElementType) {
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221 case JSONElementType.BeginArray:
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222 if (m_flattenArrays && !m_localName.isArray) {
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223 m_depthCorrection--;
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224 SetLocalName(itemName, true);
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225 continue;
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226 } else {
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227 SetLocalName(itemName, true);
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228 }
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229 break;
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230 case JSONElementType.BeginObject:
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231 SetLocalName(itemName);
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232 break;
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233 case JSONElementType.EndArray:
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234 if (m_flattenArrays && !m_localNameStack.Peek().isArray) {
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235 RestoreLocalName();
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236 m_depthCorrection++;
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237 continue;
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238 }
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239 break;
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240 case JSONElementType.EndObject:
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241 break;
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242 case JSONElementType.Value:
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243 SetLocalName(itemName);
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244 m_valueContext = m_parser.ElementValue == null ? ValueContext.ElementEmpty : ValueContext.ElementStart;
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245 break;
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246 default:
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247 break;
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248 }
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249 return true;
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250 }
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251
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252 m_state = System.Xml.ReadState.EndOfFile;
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253 return false;
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254 } catch {
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255 m_state = System.Xml.ReadState.Error;
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256 throw;
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257 }
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258 }
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259
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260 public override bool ReadAttributeValue() {
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261 return false;
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262 }
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263
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264 public override ReadState ReadState {
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265 get { return m_state; }
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266 }
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267
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268 public override void ResolveEntity() {
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269 // do nothing
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270 }
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271
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272 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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274 }
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275
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276 void SetLocalName(string name) {
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277 m_localNameStack.Push(m_localName);
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278 m_localName.localName = name;
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279 m_localName.isArray = false;
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280 }
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281
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282 void SetLocalName(string name, bool isArray) {
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283 m_localNameStack.Push(m_localName);
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284 m_localName.localName = name;
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285 m_localName.isArray = isArray;
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286 }
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287
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288 void RestoreLocalName() {
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289 m_localName = m_localNameStack.Pop();
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290 }
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291
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292 public override void Close() {
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59
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293
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58
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294 }
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59
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295
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296 protected override void Dispose(bool disposing) {
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297 if (disposing) {
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298 m_parser.Dispose();
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299 }
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300 base.Dispose(disposing);
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301 }
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302
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60
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303
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304 public static JSONXmlReader OpenFile(string file, JSONXmlReaderOptions options) {
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305 var stream = File.OpenText(file);
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306 var parser = new JSONParser(stream, true);
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307 return new JSONXmlReader(parser, options);
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308 }
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58
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309 }
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310 }
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