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comparison Implab/JSON/JSONXmlReader.cs @ 58:1710dcda34bb

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Added JSONXmlReader
author cin
date Tue, 17 Jun 2014 19:40:43 +0400
parents
children 21611344d366
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57:7759c80cad95 58:1710dcda34bb
1 using Implab;
2 using Implab.JSON;
3 using Implab.Parsing;
4 using System;
5 using System.Collections.Generic;
6 using System.Linq;
7 using System.Text;
8 using System.Threading.Tasks;
9 using System.Xml;
10
11 namespace ConsPlay {
12 public class JSONXmlReader : XmlReader {
13
14 enum ValueContext {
15 Undefined,
16 ElementStart,
17 ElementValue,
18 ElementEnd,
19 ElementEmpty
20 }
21
22 struct LocalNameContext {
23 public string localName;
24 public bool isArray;
25 }
26
27 JSONParser m_parser;
28 ValueContext m_valueContext;
29 ReadState m_state = ReadState.Initial;
30 Stack<LocalNameContext> m_localNameStack = new Stack<LocalNameContext>();
31 LocalNameContext m_localName;
32 string m_rootName = "json";
33 string m_prefix = String.Empty;
34 string m_namespaceUri = String.Empty;
35 bool m_flattenArrays = false;
36 NameTable m_nameTable = new NameTable();
37 int m_depthCorrection = 0;
38
39 public JSONXmlReader(JSONParser parser) {
40 Safe.ArgumentNotNull(parser, "parser");
41 m_parser = parser;
42 }
43
44 /// <summary>
45 /// Always 0, JSON doesn't support attributes
46 /// </summary>
47 public override int AttributeCount {
48 get { return 0; }
49 }
50
51 public override string BaseURI {
52 get { return String.Empty; }
53 }
54
55 public override int Depth {
56 get {
57 return m_localNameStack.Count+m_depthCorrection;
58 }
59 }
60
61 public override bool EOF {
62 get { return m_parser.EOF; }
63 }
64
65 /// <summary>
66 /// Always throws an exception
67 /// </summary>
68 /// <param name="i"></param>
69 /// <returns></returns>
70 public override string GetAttribute(int i) {
71 throw new ArgumentOutOfRangeException();
72 }
73
74 /// <summary>
75 /// Always returns empty string
76 /// </summary>
77 /// <param name="name"></param>
78 /// <param name="namespaceURI"></param>
79 /// <returns></returns>
80 public override string GetAttribute(string name, string namespaceURI) {
81 return String.Empty;
82 }
83
84 /// <summary>
85 /// Always returns empty string
86 /// </summary>
87 /// <param name="name"></param>
88 /// <returns></returns>
89 public override string GetAttribute(string name) {
90 return String.Empty;
91 }
92
93 public override bool IsEmptyElement {
94 get { return m_parser.ElementType == JSONElementType.Value && m_valueContext == ValueContext.ElementEmpty; }
95 }
96
97 public override string LocalName {
98 get { return m_localName.localName; }
99 }
100
101 public override string LookupNamespace(string prefix) {
102 if (String.IsNullOrEmpty(prefix) || prefix == m_prefix)
103 return m_namespaceUri;
104 else
105 return String.Empty;
106 }
107
108 public override bool MoveToAttribute(string name, string ns) {
109 return false;
110 }
111
112 public override bool MoveToAttribute(string name) {
113 return false;
114 }
115
116 public override bool MoveToElement() {
117 return false;
118 }
119
120 public override bool MoveToFirstAttribute() {
121 return false;
122 }
123
124 public override bool MoveToNextAttribute() {
125 return false;
126 }
127
128 public override XmlNameTable NameTable {
129 get { return m_nameTable; }
130 }
131
132 public override string NamespaceURI {
133 get { return m_namespaceUri; }
134 }
135
136 public override XmlNodeType NodeType {
137 get {
138 switch (m_parser.ElementType) {
139 case JSONElementType.BeginObject:
140 case JSONElementType.BeginArray:
141 return XmlNodeType.Element;
142 case JSONElementType.EndObject:
143 case JSONElementType.EndArray:
144 return XmlNodeType.EndElement;
145 case JSONElementType.Value:
146 switch (m_valueContext) {
147 case ValueContext.ElementStart:
148 case ValueContext.ElementEmpty:
149 return XmlNodeType.Element;
150 case ValueContext.ElementValue:
151 return XmlNodeType.Text;
152 case ValueContext.ElementEnd:
153 return XmlNodeType.EndElement;
154 default:
155 throw new InvalidOperationException();
156 }
157 default:
158 throw new InvalidOperationException();
159 }
160 }
161 }
162
163 public override string Prefix {
164 get { return m_prefix; }
165 }
166
167 public override bool Read() {
168 if (m_state != System.Xml.ReadState.Interactive && m_state != System.Xml.ReadState.Initial)
169 return false;
170
171 if (m_state == ReadState.Initial)
172 m_state = System.Xml.ReadState.Interactive;
173
174 try {
175 switch (m_parser.ElementType) {
176 case JSONElementType.Value:
177 switch (m_valueContext) {
178 case ValueContext.ElementStart:
179 SetLocalName(String.Empty);
180 m_valueContext = ValueContext.ElementValue;
181 return true;
182 case ValueContext.ElementValue:
183 RestoreLocalName();
184 m_valueContext = ValueContext.ElementEnd;
185 return true;
186 case ValueContext.ElementEmpty:
187 case ValueContext.ElementEnd:
188 RestoreLocalName();
189 break;
190 }
191 break;
192 case JSONElementType.EndArray:
193 case JSONElementType.EndObject:
194 RestoreLocalName();
195 break;
196 }
197 string itemName = m_parser.ElementType == JSONElementType.None ? m_rootName : m_flattenArrays ? m_localName.localName : "item";
198 while (m_parser.Read()) {
199 if (!String.IsNullOrEmpty(m_parser.ElementName))
200 itemName = m_parser.ElementName;
201
202 switch (m_parser.ElementType) {
203 case JSONElementType.BeginArray:
204 if (m_flattenArrays && !m_localName.isArray) {
205 m_depthCorrection--;
206 SetLocalName(itemName, true);
207 continue;
208 } else {
209 SetLocalName(itemName, true);
210 }
211 break;
212 case JSONElementType.BeginObject:
213 SetLocalName(itemName);
214 break;
215 case JSONElementType.EndArray:
216 if (m_flattenArrays && !m_localNameStack.Peek().isArray) {
217 RestoreLocalName();
218 m_depthCorrection++;
219 continue;
220 }
221 break;
222 case JSONElementType.EndObject:
223 break;
224 case JSONElementType.Value:
225 SetLocalName(itemName);
226 m_valueContext = m_parser.ElementValue == null ? ValueContext.ElementEmpty : ValueContext.ElementStart;
227 break;
228 default:
229 break;
230 }
231 return true;
232 }
233
234 m_state = System.Xml.ReadState.EndOfFile;
235 return false;
236 } catch {
237 m_state = System.Xml.ReadState.Error;
238 throw;
239 }
240 }
241
242 public override bool ReadAttributeValue() {
243 return false;
244 }
245
246 public override ReadState ReadState {
247 get { return m_state; }
248 }
249
250 public override void ResolveEntity() {
251 // do nothing
252 }
253
254 public override string Value {
255 get { return m_parser.ElementValue == null ? String.Empty : m_parser.ElementValue.ToString(); }
256 }
257
258 void SetLocalName(string name) {
259 m_localNameStack.Push(m_localName);
260 m_localName.localName = name;
261 m_localName.isArray = false;
262 }
263
264 void SetLocalName(string name, bool isArray) {
265 m_localNameStack.Push(m_localName);
266 m_localName.localName = name;
267 m_localName.isArray = isArray;
268 }
269
270 void RestoreLocalName() {
271 m_localName = m_localNameStack.Pop();
272 }
273
274 public override void Close() {
275 m_state = System.Xml.ReadState.EndOfFile ;
276 }
277 }
278 }