|
163
|
1 using Implab;
|
|
|
2 using Implab.Parsing;
|
|
|
3 using System;
|
|
|
4 using System.Collections.Generic;
|
|
|
5 using System.Globalization;
|
|
|
6 using System.IO;
|
|
|
7 using System.Linq;
|
|
|
8 using System.Text;
|
|
|
9 using System.Threading.Tasks;
|
|
|
10 using System.Xml;
|
|
|
11
|
|
|
12 namespace Implab.JSON {
|
|
|
13 public class JSONXmlReader : XmlReader {
|
|
|
14
|
|
|
15 enum ValueContext {
|
|
|
16 Undefined,
|
|
|
17 ElementStart,
|
|
|
18 ElementValue,
|
|
|
19 ElementEnd,
|
|
|
20 ElementEmpty
|
|
|
21 }
|
|
|
22
|
|
|
23 struct LocalNameContext {
|
|
|
24 public string localName;
|
|
|
25 public bool isArray;
|
|
|
26 }
|
|
|
27
|
|
|
28 JSONParser m_parser;
|
|
|
29 ValueContext m_valueContext;
|
|
|
30 ReadState m_state = ReadState.Initial;
|
|
|
31 Stack<LocalNameContext> m_localNameStack = new Stack<LocalNameContext>();
|
|
|
32 LocalNameContext m_localName;
|
|
|
33 int m_depthCorrection = 0;
|
|
|
34
|
|
|
35 readonly string m_rootName;
|
|
|
36 readonly string m_prefix;
|
|
|
37 readonly string m_namespaceUri;
|
|
|
38 readonly bool m_flattenArrays;
|
|
|
39 readonly string m_arrayItemName;
|
|
|
40 readonly XmlNameTable m_nameTable;
|
|
|
41
|
|
|
42 JSONXmlReader(JSONParser parser, JSONXmlReaderOptions options) {
|
|
|
43 m_parser = parser;
|
|
|
44
|
|
|
45 if (options != null) {
|
|
|
46 m_prefix = options.NodesPrefix ?? String.Empty;
|
|
|
47 m_namespaceUri = options.NamespaceURI ?? String.Empty;
|
|
|
48 m_rootName = options.RootName ?? "json";
|
|
|
49 m_flattenArrays = options.FlattenArrays;
|
|
|
50 m_arrayItemName = options.ArrayItemName ?? "item";
|
|
|
51 m_nameTable = options.NameTable ?? new NameTable();
|
|
|
52 } else {
|
|
|
53 m_prefix = String.Empty;
|
|
|
54 m_namespaceUri = String.Empty;
|
|
|
55 m_rootName = "json";
|
|
|
56 m_flattenArrays = false;
|
|
|
57 m_arrayItemName = "item";
|
|
|
58 m_nameTable = new NameTable();
|
|
|
59 }
|
|
|
60 }
|
|
|
61
|
|
|
62 /// <summary>
|
|
|
63 /// Always 0, JSON doesn't support attributes
|
|
|
64 /// </summary>
|
|
|
65 public override int AttributeCount {
|
|
|
66 get { return 0; }
|
|
|
67 }
|
|
|
68
|
|
|
69 public override string BaseURI {
|
|
|
70 get { return String.Empty; }
|
|
|
71 }
|
|
|
72
|
|
|
73 public override int Depth {
|
|
|
74 get {
|
|
|
75 return m_localNameStack.Count + m_depthCorrection;
|
|
|
76 }
|
|
|
77 }
|
|
|
78
|
|
|
79 public override bool EOF {
|
|
|
80 get { return m_parser.EOF; }
|
|
|
81 }
|
|
|
82
|
|
|
83 /// <summary>
|
|
|
84 /// Always throws an exception
|
|
|
85 /// </summary>
|
|
|
86 /// <param name="i"></param>
|
|
|
87 /// <returns></returns>
|
|
|
88 public override string GetAttribute(int i) {
|
|
|
89 throw new ArgumentOutOfRangeException();
|
|
|
90 }
|
|
|
91
|
|
|
92 /// <summary>
|
|
|
93 /// Always returns empty string
|
|
|
94 /// </summary>
|
|
|
95 /// <param name="name"></param>
|
|
|
96 /// <param name="namespaceURI"></param>
|
|
|
97 /// <returns></returns>
|
|
|
98 public override string GetAttribute(string name, string namespaceURI) {
|
|
|
99 return String.Empty;
|
|
|
100 }
|
|
|
101
|
|
|
102 /// <summary>
|
|
|
103 /// Always returns empty string
|
|
|
104 /// </summary>
|
|
|
105 /// <param name="name"></param>
|
|
|
106 /// <returns></returns>
|
|
|
107 public override string GetAttribute(string name) {
|
|
|
108 return String.Empty;
|
|
|
109 }
|
|
|
110
|
|
|
111 public override bool IsEmptyElement {
|
|
|
112 get { return m_parser.ElementType == JSONElementType.Value && m_valueContext == ValueContext.ElementEmpty; }
|
|
|
113 }
|
|
|
114
|
|
|
115 public override string LocalName {
|
|
|
116 get { return m_localName.localName; }
|
|
|
117 }
|
|
|
118
|
|
|
119 public override string LookupNamespace(string prefix) {
|
|
|
120 if (String.IsNullOrEmpty(prefix) || prefix == m_prefix)
|
|
|
121 return m_namespaceUri;
|
|
|
122 else
|
|
|
123 return String.Empty;
|
|
|
124 }
|
|
|
125
|
|
|
126 public override bool MoveToAttribute(string name, string ns) {
|
|
|
127 return false;
|
|
|
128 }
|
|
|
129
|
|
|
130 public override bool MoveToAttribute(string name) {
|
|
|
131 return false;
|
|
|
132 }
|
|
|
133
|
|
|
134 public override bool MoveToElement() {
|
|
|
135 return false;
|
|
|
136 }
|
|
|
137
|
|
|
138 public override bool MoveToFirstAttribute() {
|
|
|
139 return false;
|
|
|
140 }
|
|
|
141
|
|
|
142 public override bool MoveToNextAttribute() {
|
|
|
143 return false;
|
|
|
144 }
|
|
|
145
|
|
|
146 public override XmlNameTable NameTable {
|
|
|
147 get { return m_nameTable; }
|
|
|
148 }
|
|
|
149
|
|
|
150 public override string NamespaceURI {
|
|
|
151 get { return m_namespaceUri; }
|
|
|
152 }
|
|
|
153
|
|
|
154 public override XmlNodeType NodeType {
|
|
|
155 get {
|
|
|
156 switch (m_parser.ElementType) {
|
|
|
157 case JSONElementType.BeginObject:
|
|
|
158 case JSONElementType.BeginArray:
|
|
|
159 return XmlNodeType.Element;
|
|
|
160 case JSONElementType.EndObject:
|
|
|
161 case JSONElementType.EndArray:
|
|
|
162 return XmlNodeType.EndElement;
|
|
|
163 case JSONElementType.Value:
|
|
|
164 switch (m_valueContext) {
|
|
|
165 case ValueContext.ElementStart:
|
|
|
166 case ValueContext.ElementEmpty:
|
|
|
167 return XmlNodeType.Element;
|
|
|
168 case ValueContext.ElementValue:
|
|
|
169 return XmlNodeType.Text;
|
|
|
170 case ValueContext.ElementEnd:
|
|
|
171 return XmlNodeType.EndElement;
|
|
|
172 default:
|
|
|
173 throw new InvalidOperationException();
|
|
|
174 }
|
|
|
175 default:
|
|
|
176 throw new InvalidOperationException();
|
|
|
177 }
|
|
|
178 }
|
|
|
179 }
|
|
|
180
|
|
|
181 public override string Prefix {
|
|
|
182 get { return m_prefix; }
|
|
|
183 }
|
|
|
184
|
|
|
185 public override bool Read() {
|
|
|
186 if (m_state != System.Xml.ReadState.Interactive && m_state != System.Xml.ReadState.Initial)
|
|
|
187 return false;
|
|
|
188
|
|
|
189 if (m_state == ReadState.Initial)
|
|
|
190 m_state = System.Xml.ReadState.Interactive;
|
|
|
191
|
|
|
192 try {
|
|
|
193 switch (m_parser.ElementType) {
|
|
|
194 case JSONElementType.Value:
|
|
|
195 switch (m_valueContext) {
|
|
|
196 case ValueContext.ElementStart:
|
|
|
197 SetLocalName(String.Empty);
|
|
|
198 m_valueContext = ValueContext.ElementValue;
|
|
|
199 return true;
|
|
|
200 case ValueContext.ElementValue:
|
|
|
201 RestoreLocalName();
|
|
|
202 m_valueContext = ValueContext.ElementEnd;
|
|
|
203 return true;
|
|
|
204 case ValueContext.ElementEmpty:
|
|
|
205 case ValueContext.ElementEnd:
|
|
|
206 RestoreLocalName();
|
|
|
207 break;
|
|
|
208 }
|
|
|
209 break;
|
|
|
210 case JSONElementType.EndArray:
|
|
|
211 case JSONElementType.EndObject:
|
|
|
212 RestoreLocalName();
|
|
|
213 break;
|
|
|
214 }
|
|
|
215 string itemName = m_parser.ElementType == JSONElementType.None ? m_rootName : m_flattenArrays ? m_localName.localName : m_arrayItemName;
|
|
|
216 while (m_parser.Read()) {
|
|
|
217 if (!String.IsNullOrEmpty(m_parser.ElementName))
|
|
|
218 itemName = m_parser.ElementName;
|
|
|
219
|
|
|
220 switch (m_parser.ElementType) {
|
|
|
221 case JSONElementType.BeginArray:
|
|
|
222 if (m_flattenArrays && !m_localName.isArray) {
|
|
|
223 m_depthCorrection--;
|
|
|
224 SetLocalName(itemName, true);
|
|
|
225 continue;
|
|
|
226 } else {
|
|
|
227 SetLocalName(itemName, true);
|
|
|
228 }
|
|
|
229 break;
|
|
|
230 case JSONElementType.BeginObject:
|
|
|
231 SetLocalName(itemName);
|
|
|
232 break;
|
|
|
233 case JSONElementType.EndArray:
|
|
|
234 if (m_flattenArrays && !m_localNameStack.Peek().isArray) {
|
|
|
235 RestoreLocalName();
|
|
|
236 m_depthCorrection++;
|
|
|
237 continue;
|
|
|
238 }
|
|
|
239 break;
|
|
|
240 case JSONElementType.EndObject:
|
|
|
241 break;
|
|
|
242 case JSONElementType.Value:
|
|
|
243 SetLocalName(itemName);
|
|
|
244 m_valueContext = m_parser.ElementValue == null ? ValueContext.ElementEmpty : ValueContext.ElementStart;
|
|
|
245 break;
|
|
|
246 default:
|
|
|
247 break;
|
|
|
248 }
|
|
|
249 return true;
|
|
|
250 }
|
|
|
251
|
|
|
252 m_state = System.Xml.ReadState.EndOfFile;
|
|
|
253 return false;
|
|
|
254 } catch {
|
|
|
255 m_state = System.Xml.ReadState.Error;
|
|
|
256 throw;
|
|
|
257 }
|
|
|
258 }
|
|
|
259
|
|
|
260 public override bool ReadAttributeValue() {
|
|
|
261 return false;
|
|
|
262 }
|
|
|
263
|
|
|
264 public override ReadState ReadState {
|
|
|
265 get { return m_state; }
|
|
|
266 }
|
|
|
267
|
|
|
268 public override void ResolveEntity() {
|
|
|
269 // do nothing
|
|
|
270 }
|
|
|
271
|
|
|
272 public override string Value {
|
|
|
273 get {
|
|
|
274 if (m_parser.ElementValue == null)
|
|
|
275 return String.Empty;
|
|
|
276 if (Convert.GetTypeCode(m_parser.ElementValue) == TypeCode.Double)
|
|
|
277 return ((double)m_parser.ElementValue).ToString(CultureInfo.InvariantCulture);
|
|
|
278 else
|
|
|
279 return m_parser.ElementValue.ToString();
|
|
|
280 }
|
|
|
281 }
|
|
|
282
|
|
|
283 void SetLocalName(string name) {
|
|
|
284 m_localNameStack.Push(m_localName);
|
|
|
285 m_localName.localName = name;
|
|
|
286 m_localName.isArray = false;
|
|
|
287 }
|
|
|
288
|
|
|
289 void SetLocalName(string name, bool isArray) {
|
|
|
290 m_localNameStack.Push(m_localName);
|
|
|
291 m_localName.localName = name;
|
|
|
292 m_localName.isArray = isArray;
|
|
|
293 }
|
|
|
294
|
|
|
295 void RestoreLocalName() {
|
|
|
296 m_localName = m_localNameStack.Pop();
|
|
|
297 }
|
|
|
298
|
|
|
299 public override void Close() {
|
|
|
300
|
|
|
301 }
|
|
|
302
|
|
|
303 protected override void Dispose(bool disposing) {
|
|
|
304 #if MONO
|
|
|
305 disposing = true;
|
|
|
306 #endif
|
|
|
307 if (disposing) {
|
|
|
308 m_parser.Dispose();
|
|
|
309 }
|
|
|
310 base.Dispose(disposing);
|
|
|
311 }
|
|
|
312
|
|
|
313 public static JSONXmlReader Create(string file, JSONXmlReaderOptions options) {
|
|
|
314 return Create(File.OpenText(file), options);
|
|
|
315 }
|
|
|
316
|
|
|
317 /// <summary>
|
|
|
318 /// Creates the XmlReader for the specified text stream with JSON data.
|
|
|
319 /// </summary>
|
|
|
320 /// <param name="reader">Text reader.</param>
|
|
|
321 /// <param name="options">Options.</param>
|
|
|
322 /// <remarks>
|
|
|
323 /// The reader will be disposed when the XmlReader is disposed.
|
|
|
324 /// </remarks>
|
|
|
325 public static JSONXmlReader Create(TextReader reader, JSONXmlReaderOptions options) {
|
|
|
326 return new JSONXmlReader(new JSONParser(reader, true), options);
|
|
|
327 }
|
|
|
328
|
|
|
329 /// <summary>
|
|
|
330 /// Creates the XmlReader for the specified stream with JSON data.
|
|
|
331 /// </summary>
|
|
|
332 /// <param name="stream">Stream.</param>
|
|
|
333 /// <param name="options">Options.</param>
|
|
|
334 /// <remarks>
|
|
|
335 /// The stream will be disposed when the XmlReader is disposed.
|
|
|
336 /// </remarks>
|
|
|
337 public static JSONXmlReader Create(Stream stream, JSONXmlReaderOptions options) {
|
|
|
338 Safe.ArgumentNotNull(stream, "stream");
|
|
|
339 // HACK don't dispose StreaReader to keep stream opened
|
|
|
340 return Create(new StreamReader(stream), options);
|
|
|
341 }
|
|
|
342 }
|
|
|
343 }
|
