annotate Implab/Formats/JSON/JSONXmlReader.cs @ 187:dd4a3590f9c6 ref20160224

Reworked cancelation handling, if the cancel handler isn't specified the OperationCanceledException will be handled by the error handler Any unhandled OperationCanceledException will cause the promise cancelation
author cin
date Tue, 19 Apr 2016 17:35:20 +0300
parents c32688129f14
children 8222a2ab3ab7
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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8 namespace Implab.Formats.JSON {
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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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29 int m_depthCorrection;
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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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118
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119 return String.Empty;
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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() {
180
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182 if (m_state != ReadState.Interactive && m_state != ReadState.Initial)
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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186 m_state = ReadState.Interactive;
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 }
180
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223 SetLocalName(itemName, true);
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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diff changeset
229 if (m_flattenArrays && !m_localNameStack.Peek().isArray) {
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
230 RestoreLocalName();
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
231 m_depthCorrection++;
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
232 continue;
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
233 }
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
234 break;
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
235 case JSONElementType.EndObject:
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
236 break;
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
237 case JSONElementType.Value:
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
238 SetLocalName(itemName);
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
239 m_valueContext = m_parser.ElementValue == null ? ValueContext.ElementEmpty : ValueContext.ElementStart;
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
240 break;
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
241 }
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
242 return true;
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
243 }
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
244
180
c32688129f14 refactoring complete, JSONParser rewritten
cin
parents: 163
diff changeset
245 m_state = ReadState.EndOfFile;
163
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
246 return false;
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
247 } catch {
180
c32688129f14 refactoring complete, JSONParser rewritten
cin
parents: 163
diff changeset
248 m_state = ReadState.Error;
163
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
249 throw;
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
250 }
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
251 }
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
252
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
253 public override bool ReadAttributeValue() {
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
254 return false;
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
255 }
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
256
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
257 public override ReadState ReadState {
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
258 get { return m_state; }
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
259 }
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
260
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
261 public override void ResolveEntity() {
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
262 // do nothing
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
263 }
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
264
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
265 public override string Value {
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
266 get {
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
267 if (m_parser.ElementValue == null)
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
268 return String.Empty;
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
269 if (Convert.GetTypeCode(m_parser.ElementValue) == TypeCode.Double)
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
270 return ((double)m_parser.ElementValue).ToString(CultureInfo.InvariantCulture);
180
c32688129f14 refactoring complete, JSONParser rewritten
cin
parents: 163
diff changeset
271 return m_parser.ElementValue.ToString();
163
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
272 }
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
273 }
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
274
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
275 void SetLocalName(string name) {
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
276 m_localNameStack.Push(m_localName);
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
277 m_localName.localName = name;
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
278 m_localName.isArray = false;
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
279 }
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
280
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
281 void SetLocalName(string name, bool isArray) {
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
282 m_localNameStack.Push(m_localName);
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
283 m_localName.localName = name;
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
284 m_localName.isArray = isArray;
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
285 }
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
286
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
287 void RestoreLocalName() {
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
288 m_localName = m_localNameStack.Pop();
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
289 }
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
290
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
291 public override void Close() {
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
292
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
293 }
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
294
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
295 protected override void Dispose(bool disposing) {
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
296 #if MONO
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
297 disposing = true;
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
298 #endif
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
299 if (disposing) {
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
300 m_parser.Dispose();
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
301 }
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
302 base.Dispose(disposing);
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
303 }
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
304
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
305 public static JSONXmlReader Create(string file, JSONXmlReaderOptions options) {
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
306 return Create(File.OpenText(file), options);
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
307 }
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
308
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
309 /// <summary>
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
310 /// Creates the XmlReader for the specified text stream with JSON data.
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
311 /// </summary>
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
312 /// <param name="reader">Text reader.</param>
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
313 /// <param name="options">Options.</param>
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
314 /// <remarks>
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
315 /// The reader will be disposed when the XmlReader is disposed.
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
316 /// </remarks>
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
317 public static JSONXmlReader Create(TextReader reader, JSONXmlReaderOptions options) {
180
c32688129f14 refactoring complete, JSONParser rewritten
cin
parents: 163
diff changeset
318 return new JSONXmlReader(new JSONParser(reader), options);
163
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
319 }
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
320
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
321 /// <summary>
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
322 /// Creates the XmlReader for the specified stream with JSON data.
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
323 /// </summary>
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
324 /// <param name="stream">Stream.</param>
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
325 /// <param name="options">Options.</param>
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
326 /// <remarks>
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
327 /// The stream will be disposed when the XmlReader is disposed.
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
328 /// </remarks>
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
329 public static JSONXmlReader Create(Stream stream, JSONXmlReaderOptions options) {
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
330 Safe.ArgumentNotNull(stream, "stream");
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
331 // HACK don't dispose StreaReader to keep stream opened
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
332 return Create(new StreamReader(stream), options);
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
333 }
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
334 }
419aa51b04fd JSON moved to Formats namespace
cin
parents:
diff changeset
335 }