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1
5 package org.h2.tools.doc;
6
7 public class XMLParser {
8
9 public static final int ERROR = 0;
10 public static final int START_ELEMENT=1;
11 public static final int END_ELEMENT=2;
12 public static final int PROCESSING_INSTRUCTION=3;
13 public static final int CHARACTERS=4;
14 public static final int COMMENT=5;
15 public static final int SPACE=6;
16 public static final int START_DOCUMENT=7;
17 public static final int END_DOCUMENT=8;
18 public static final int ENTITY_REFERENCE=9;
19 public static final int ATTRIBUTE=10;
20 public static final int DTD=11;
21 public static final int CDATA=12;
22 public static final int NAMESPACE=13;
23 public static final int NOTATION_DECLARATION=14;
24 public static final int ENTITY_DECLARATION=15;
25
26 private String  xml;
27 private int index;
28 private int eventType;
29 private String currentText;
30 private String prefix, localName;
31 private String [] attributeValues = new String [3];
32 private int currentAttribute;
33 private boolean endElement;
34
35 public XMLParser(String xml) {
36 this.xml = xml;
37 eventType = START_DOCUMENT;
38 }
39
40 void addAttributeName(String prefix, String localName) {
41 if(attributeValues.length <= currentAttribute) {
42 String [] temp = new String [attributeValues.length * 2];
43 System.arraycopy(attributeValues, 0, temp, 0, attributeValues.length);
44 attributeValues = temp;
45 }
46 attributeValues[currentAttribute++] = prefix;
47 attributeValues[currentAttribute++] = localName;
48 }
49
50 void addAttributeValue(String v) {
51 attributeValues[currentAttribute++] = v;
52 }
53
54 private int readChar() {
55 if (index >= xml.length()) {
56 return -1;
57 }
58 return xml.charAt(index++);
59 }
60
61 private void back() {
62 index--;
63 }
64
65 private void error(String expected) {
66 throw new Error ("expected: " + expected + " got: " + xml.substring(index));
67 }
68
69 private void read(String chars) {
70 for (int i = 0; i < chars.length(); i++) {
71 if (readChar() != chars.charAt(i)) {
72 error(chars);
73 }
74 }
75 }
76
77 private void skipSpaces() {
78 while (index < xml.length() && xml.charAt(index) <= ' ') {
79 index++;
80 }
81 }
82
83 private void read() {
84 currentText = null;
85 currentAttribute = 0;
86 int currentStart = index;
87 int ch = readChar();
88 if (ch < 0) {
89 eventType = END_DOCUMENT;
90 return;
91 }
92 if (ch == '<') {
93 currentStart = index;
94 ch = readChar();
95 if (ch < 0) {
96 eventType = ERROR;
97 return;
98 } else if (ch == '?') {
99 eventType = PROCESSING_INSTRUCTION;
100 currentStart = index;
101 while (true) {
102 ch = readChar();
103 if (ch < 0) {
104 error("?>");
105 }
106 if (ch == '?' && readChar() == '>') {
107 break;
108 }
109 }
110 if(xml.substring(currentStart).startsWith("xml")) {
111 read();
112 return;
113 }
114 currentText = xml.substring(currentStart, index - 1);
115 } else if (ch == '!') {
116 ch = readChar();
117 if (ch == '-') {
118 eventType = COMMENT;
119 if (readChar() != '-') {
120 error("-");
121 }
122 currentStart = index;
123 while (true) {
124 ch = readChar();
125 if (ch < 0) {
126 error("-->");
127 }
128 if (ch == '-' && readChar() == '-') {
129 read(">");
130 break;
131 }
132 }
133 currentText = xml.substring(currentStart, index - 1);
134 } else if (ch == 'D') {
135 read("OCTYPE");
136 eventType = DTD;
137 while (true) {
138 ch = readChar();
139 if (ch < 0) {
140 break;
141 }
142 if (ch == '>') {
143 break;
144 }
145 }
146 } else if(ch == '[') {
147 read("CDATA[");
148 currentStart = index;
149 eventType = CHARACTERS;
150 while(true) {
151 ch = readChar();
152 if(ch < 0) {
153 error("]]>");
154 } else if(ch != ']') {
155 continue;
156 }
157 ch = readChar();
158 if(ch < 0) {
159 error("]]>");
160 } else if(ch == ']') {
161 do {
162 ch = readChar();
163 if(ch < 0) {
164 error("]]>");
165 }
166 } while(ch == ']');
167 if(ch == '>') {
168 currentText = xml.substring(currentStart, index - 3);
169 break;
170 }
171 }
172 }
173 }
174 } else if(ch == '/') {
175 currentStart = index;
176 prefix = null;
177 eventType = END_ELEMENT;
178 while (true) {
179 ch = readChar();
180 if (ch < 0) {
181 error(">");
182 } else if(ch == ':') {
183 prefix = xml.substring(currentStart, index - 1);
184 currentStart = index + 1;
185 } else if(ch == '>') {
186 localName = xml.substring(currentStart, index - 1);
187 break;
188 } else if(ch <= ' ') {
189 localName = xml.substring(currentStart, index - 1);
190 skipSpaces();
191 read(">");
192 break;
193 }
194 }
195 } else {
196 prefix = null;
197 localName = null;
198 eventType = START_ELEMENT;
199 while (true) {
200 ch = readChar();
201 if (ch < 0) {
202 error(">");
203 } else if(ch == ':') {
204 prefix = xml.substring(currentStart, index - 1);
205 currentStart = index + 1;
206 } else if (ch <= ' ') {
207 localName = xml.substring(currentStart, index - 1);
208 readAttributeValues();
209 ch = readChar();
210 }
211 if (ch == '/') {
212 if(localName == null) {
213 localName = xml.substring(currentStart, index - 1);
214 }
215 read(">");
216 endElement = true;
217 break;
218 } else if(ch == '>') {
219 if(localName == null) {
220 localName = xml.substring(currentStart, index - 1);
221 }
222 break;
223 }
224 }
225 }
226 } else {
227 eventType = CHARACTERS;
228 while (true) {
229 ch = readChar();
230 if(ch < 0) {
231 break;
232 } else if(ch == '<') {
233 back();
234 break;
235 }
236 }
237 currentText = xml.substring(currentStart, index);
238 }
239 }
240
241 private void readAttributeValues() {
242 while(true) {
243 int start = index;
244 int ch = readChar();
245 if(ch < 0) {
246 error(">");
247 } else if(ch <= ' ') {
248 continue;
249 } else if(ch == '/' || ch == '>') {
250 back();
251 return;
252 }
253 int end;
254 int localNameStart = start;
255 while(true) {
256 end = index;
257 ch = readChar();
258 if(ch < 0) {
259 error("=");
260 } else if(ch <= ' ') {
261 skipSpaces();
262 ch = readChar();
263 if(ch != '=') {
264 error("=");
265 }
266 break;
267 } else if(ch == '=') {
268 break;
269 } else if(ch == ':') {
270 localNameStart = index;
271 }
272 }
273 if(localNameStart == start) {
274 addAttributeName("", xml.substring(localNameStart, end));
275 } else {
276 addAttributeName(xml.substring(start, localNameStart - 1), xml.substring(localNameStart, end));
277 }
278 skipSpaces();
279 ch = readChar();
280 if(ch != '\"') {
281 error("\"");
282 }
283 start = index;
284 while(true) {
285 end = index;
286 ch = readChar();
287 if(ch < 0) {
288 error("\"");
289 } else if(ch == '\"') {
290 break;
291 }
292 }
293 addAttributeValue(xml.substring(start, end));
294 }
295 }
296
297 public boolean hasNext() {
298 return index < xml.length();
299 }
300
301 public int next() {
302 if(endElement) {
303 endElement = false;
304 eventType = END_ELEMENT;
305 } else {
306 read();
307 }
308 return eventType;
309 }
310
311 public int nextTag() {
312 while (true) {
313 int type = next();
314 if (type != COMMENT && type != DTD && type != PROCESSING_INSTRUCTION) {
315 return type;
316 }
317 }
318 }
319
320 public int getEventType() {
321 return eventType;
322 }
323
324 public String getText() {
325 return currentText;
326 }
327
328 public int getAttributeCount() {
329 return currentAttribute / 3;
330 }
331
332 public String getAttributePrefix(int index) {
333 return attributeValues[index * 3];
334 }
335
336 public String getAttributeLocalName(int index) {
337 return attributeValues[index * 3 + 1];
338 }
339
340 public String getAttributeName(int index) {
341 String prefix = getAttributePrefix(index);
342 String localName = getAttributeLocalName(index);
343 return prefix == null || prefix.length() == 0 ? localName : prefix + ":" + localName;
344 }
345
346 public String getAttributeValue(int index) {
347 return attributeValues[index * 3 + 2];
348 }
349
350 public String getAttributeValue(String namespaceURI, String localName) {
351 int len = getAttributeCount();
352 for(int i=0; i<len; i ++) {
353 if(getAttributeLocalName(i).equals(localName)) {
354 return getAttributeValue(i);
355 }
356 }
357 return null;
358 }
359
360 public String getName() {
361 return prefix == null || prefix.length() == 0 ? localName : prefix + ":" + localName;
362 }
363
364 public String getLocalName() {
365 return localName;
366 }
367
368 public String getPrefix() {
369 return prefix;
370 }
371
372 public boolean isWhiteSpace() {
373 return getText().trim().length() == 0;
374 }
375
376 public String getRemaining() {
377 return xml.substring(index);
378 }
379
380 }
381 |
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