1. Project Clover database Fri Dec 6 2024 13:47:14 GMT
  2. Package org.json

File XMLTokener.java

 

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Classes

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XMLTokener 36 192 84
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1    package org.json;
2   
3    /*
4    Copyright (c) 2002 JSON.org
5   
6    Permission is hereby granted, free of charge, to any person obtaining a copy
7    of this software and associated documentation files (the "Software"), to deal
8    in the Software without restriction, including without limitation the rights
9    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10    copies of the Software, and to permit persons to whom the Software is
11    furnished to do so, subject to the following conditions:
12   
13    The above copyright notice and this permission notice shall be included in all
14    copies or substantial portions of the Software.
15   
16    The Software shall be used for Good, not Evil.
17   
18    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
21    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
22    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
23    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
24    SOFTWARE.
25    */
26   
27    import java.io.Reader;
28   
29    /**
30    * The XMLTokener extends the JSONTokener to provide additional methods for the
31    * parsing of XML texts.
32    *
33    * @author JSON.org
34    * @version 2015-12-09
35    */
 
36    public class XMLTokener extends JSONTokener
37    {
38   
39    /**
40    * The table of entity values. It initially contains Character values for amp,
41    * apos, gt, lt, quot.
42    */
43    public static final java.util.HashMap<String, Character> entity;
44   
 
45  0 toggle static
46    {
47  0 entity = new java.util.HashMap<String, Character>(8);
48  0 entity.put("amp", XML.AMP);
49  0 entity.put("apos", XML.APOS);
50  0 entity.put("gt", XML.GT);
51  0 entity.put("lt", XML.LT);
52  0 entity.put("quot", XML.QUOT);
53    }
54   
55    /**
56    * Construct an XMLTokener from a Reader.
57    *
58    * @param r
59    * A source reader.
60    */
 
61  0 toggle public XMLTokener(Reader r)
62    {
63  0 super(r);
64    }
65   
66    /**
67    * Construct an XMLTokener from a string.
68    *
69    * @param s
70    * A source string.
71    */
 
72  0 toggle public XMLTokener(String s)
73    {
74  0 super(s);
75    }
76   
77    /**
78    * Get the text in the CDATA block.
79    *
80    * @return The string up to the <code>]]&gt;</code>.
81    * @throws JSONException
82    * If the <code>]]&gt;</code> is not found.
83    */
 
84  0 toggle public String nextCDATA() throws JSONException
85    {
86  0 char c;
87  0 int i;
88  0 StringBuilder sb = new StringBuilder();
89  0 while (more())
90    {
91  0 c = next();
92  0 sb.append(c);
93  0 i = sb.length() - 3;
94  0 if (i >= 0 && sb.charAt(i) == ']' && sb.charAt(i + 1) == ']'
95    && sb.charAt(i + 2) == '>')
96    {
97  0 sb.setLength(i);
98  0 return sb.toString();
99    }
100    }
101  0 throw syntaxError("Unclosed CDATA");
102    }
103   
104    /**
105    * Get the next XML outer token, trimming whitespace. There are two kinds of
106    * tokens: the '<' character which begins a markup tag, and the content text
107    * between markup tags.
108    *
109    * @return A string, or a '<' Character, or null if there is no more source
110    * text.
111    * @throws JSONException
112    */
 
113  0 toggle public Object nextContent() throws JSONException
114    {
115  0 char c;
116  0 StringBuilder sb;
117  0 do
118    {
119  0 c = next();
120  0 } while (Character.isWhitespace(c));
121  0 if (c == 0)
122    {
123  0 return null;
124    }
125  0 if (c == '<')
126    {
127  0 return XML.LT;
128    }
129  0 sb = new StringBuilder();
130  0 for (;;)
131    {
132  0 if (c == 0)
133    {
134  0 return sb.toString().trim();
135    }
136  0 if (c == '<')
137    {
138  0 back();
139  0 return sb.toString().trim();
140    }
141  0 if (c == '&')
142    {
143  0 sb.append(nextEntity(c));
144    }
145    else
146    {
147  0 sb.append(c);
148    }
149  0 c = next();
150    }
151    }
152   
153    /**
154    * Return the next entity. These entities are translated to Characters:
155    * <code>&amp; &apos; &gt; &lt; &quot;</code>.
156    *
157    * @param ampersand
158    * An ampersand character.
159    * @return A Character or an entity String if the entity is not recognized.
160    * @throws JSONException
161    * If missing ';' in XML entity.
162    */
 
163  0 toggle public Object nextEntity(char ampersand) throws JSONException
164    {
165  0 StringBuilder sb = new StringBuilder();
166  0 for (;;)
167    {
168  0 char c = next();
169  0 if (Character.isLetterOrDigit(c) || c == '#')
170    {
171  0 sb.append(Character.toLowerCase(c));
172    }
173  0 else if (c == ';')
174    {
175  0 break;
176    }
177    else
178    {
179  0 throw syntaxError("Missing ';' in XML entity: &" + sb);
180    }
181    }
182  0 String string = sb.toString();
183  0 return unescapeEntity(string);
184    }
185   
186    /**
187    * Unescapes an XML entity encoding;
188    *
189    * @param e
190    * entity (only the actual entity value, not the preceding & or
191    * ending ;
192    * @return
193    */
 
194  0 toggle static String unescapeEntity(String e)
195    {
196    // validate
197  0 if (e == null || e.isEmpty())
198    {
199  0 return "";
200    }
201    // if our entity is an encoded unicode point, parse it.
202  0 if (e.charAt(0) == '#')
203    {
204  0 int cp;
205  0 if (e.charAt(1) == 'x')
206    {
207    // hex encoded unicode
208  0 cp = Integer.parseInt(e.substring(2), 16);
209    }
210    else
211    {
212    // decimal encoded unicode
213  0 cp = Integer.parseInt(e.substring(1));
214    }
215  0 return new String(new int[] { cp }, 0, 1);
216    }
217  0 Character knownEntity = entity.get(e);
218  0 if (knownEntity == null)
219    {
220    // we don't know the entity so keep it encoded
221  0 return '&' + e + ';';
222    }
223  0 return knownEntity.toString();
224    }
225   
226    /**
227    * Returns the next XML meta token. This is used for skipping over <!...> and
228    * <?...?> structures.
229    *
230    * @return Syntax characters (<code>< > / = ! ?</code>) are returned as
231    * Character, and strings and names are returned as Boolean. We don't
232    * care what the values actually are.
233    * @throws JSONException
234    * If a string is not properly closed or if the XML is badly
235    * structured.
236    */
 
237  0 toggle public Object nextMeta() throws JSONException
238    {
239  0 char c;
240  0 char q;
241  0 do
242    {
243  0 c = next();
244  0 } while (Character.isWhitespace(c));
245  0 switch (c)
246    {
247  0 case 0:
248  0 throw syntaxError("Misshaped meta tag");
249  0 case '<':
250  0 return XML.LT;
251  0 case '>':
252  0 return XML.GT;
253  0 case '/':
254  0 return XML.SLASH;
255  0 case '=':
256  0 return XML.EQ;
257  0 case '!':
258  0 return XML.BANG;
259  0 case '?':
260  0 return XML.QUEST;
261  0 case '"':
262  0 case '\'':
263  0 q = c;
264  0 for (;;)
265    {
266  0 c = next();
267  0 if (c == 0)
268    {
269  0 throw syntaxError("Unterminated string");
270    }
271  0 if (c == q)
272    {
273  0 return Boolean.TRUE;
274    }
275    }
276  0 default:
277  0 for (;;)
278    {
279  0 c = next();
280  0 if (Character.isWhitespace(c))
281    {
282  0 return Boolean.TRUE;
283    }
284  0 switch (c)
285    {
286  0 case 0:
287  0 case '<':
288  0 case '>':
289  0 case '/':
290  0 case '=':
291  0 case '!':
292  0 case '?':
293  0 case '"':
294  0 case '\'':
295  0 back();
296  0 return Boolean.TRUE;
297    }
298    }
299    }
300    }
301   
302    /**
303    * Get the next XML Token. These tokens are found inside of angle brackets. It
304    * may be one of these characters: <code>/ > = ! ?</code> or it may be a
305    * string wrapped in single quotes or double quotes, or it may be a name.
306    *
307    * @return a String or a Character.
308    * @throws JSONException
309    * If the XML is not well formed.
310    */
 
311  0 toggle public Object nextToken() throws JSONException
312    {
313  0 char c;
314  0 char q;
315  0 StringBuilder sb;
316  0 do
317    {
318  0 c = next();
319  0 } while (Character.isWhitespace(c));
320  0 switch (c)
321    {
322  0 case 0:
323  0 throw syntaxError("Misshaped element");
324  0 case '<':
325  0 throw syntaxError("Misplaced '<'");
326  0 case '>':
327  0 return XML.GT;
328  0 case '/':
329  0 return XML.SLASH;
330  0 case '=':
331  0 return XML.EQ;
332  0 case '!':
333  0 return XML.BANG;
334  0 case '?':
335  0 return XML.QUEST;
336   
337    // Quoted string
338   
339  0 case '"':
340  0 case '\'':
341  0 q = c;
342  0 sb = new StringBuilder();
343  0 for (;;)
344    {
345  0 c = next();
346  0 if (c == 0)
347    {
348  0 throw syntaxError("Unterminated string");
349    }
350  0 if (c == q)
351    {
352  0 return sb.toString();
353    }
354  0 if (c == '&')
355    {
356  0 sb.append(nextEntity(c));
357    }
358    else
359    {
360  0 sb.append(c);
361    }
362    }
363  0 default:
364   
365    // Name
366   
367  0 sb = new StringBuilder();
368  0 for (;;)
369    {
370  0 sb.append(c);
371  0 c = next();
372  0 if (Character.isWhitespace(c))
373    {
374  0 return sb.toString();
375    }
376  0 switch (c)
377    {
378  0 case 0:
379  0 return sb.toString();
380  0 case '>':
381  0 case '/':
382  0 case '=':
383  0 case '!':
384  0 case '?':
385  0 case '[':
386  0 case ']':
387  0 back();
388  0 return sb.toString();
389  0 case '<':
390  0 case '"':
391  0 case '\'':
392  0 throw syntaxError("Bad character in a name");
393    }
394    }
395    }
396    }
397   
398    /**
399    * Skip characters until past the requested string. If it is not found, we are
400    * left at the end of the source with a result of false.
401    *
402    * @param to
403    * A string to skip past.
404    */
405    // The Android implementation of JSONTokener has a public method of public
406    // void skipPast(String to)
407    // even though ours does not have that method, to have API compatibility, our
408    // method in the subclass
409    // should match.
 
410  0 toggle public void skipPast(String to)
411    {
412  0 boolean b;
413  0 char c;
414  0 int i;
415  0 int j;
416  0 int offset = 0;
417  0 int length = to.length();
418  0 char[] circle = new char[length];
419   
420    /*
421    * First fill the circle buffer with as many characters as are in the
422    * to string. If we reach an early end, bail.
423    */
424   
425  0 for (i = 0; i < length; i += 1)
426    {
427  0 c = next();
428  0 if (c == 0)
429    {
430  0 return;
431    }
432  0 circle[i] = c;
433    }
434   
435    /* We will loop, possibly for all of the remaining characters. */
436   
437  0 for (;;)
438    {
439  0 j = offset;
440  0 b = true;
441   
442    /* Compare the circle buffer with the to string. */
443   
444  0 for (i = 0; i < length; i += 1)
445    {
446  0 if (circle[j] != to.charAt(i))
447    {
448  0 b = false;
449  0 break;
450    }
451  0 j += 1;
452  0 if (j >= length)
453    {
454  0 j -= length;
455    }
456    }
457   
458    /* If we exit the loop with b intact, then victory is ours. */
459   
460  0 if (b)
461    {
462  0 return;
463    }
464   
465    /* Get the next character. If there isn't one, then defeat is ours. */
466   
467  0 c = next();
468  0 if (c == 0)
469    {
470  0 return;
471    }
472    /*
473    * Shove the character in the circle buffer and advance the
474    * circle offset. The offset is mod n.
475    */
476  0 circle[offset] = c;
477  0 offset += 1;
478  0 if (offset >= length)
479    {
480  0 offset -= length;
481    }
482    }
483    }
484    }