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22
23 package org.apache.cayenne.wocompat.parser;
24
25
29
30 public class SimpleCharStream
31 {
32 public static final boolean staticFlag = false;
33 int bufsize;
34 int available;
35 int tokenBegin;
36 public int bufpos = -1;
37 protected int bufline[];
38 protected int bufcolumn[];
39
40 protected int column = 0;
41 protected int line = 1;
42
43 protected boolean prevCharIsCR = false;
44 protected boolean prevCharIsLF = false;
45
46 protected java.io.Reader  inputStream;
47
48 protected char[] buffer;
49 protected int maxNextCharInd = 0;
50 protected int inBuf = 0;
51
52 protected void ExpandBuff(boolean wrapAround)
53 {
54 char[] newbuffer = new char[bufsize + 2048];
55 int newbufline[] = new int[bufsize + 2048];
56 int newbufcolumn[] = new int[bufsize + 2048];
57
58 try
59 {
60 if (wrapAround)
61 {
62 System.arraycopy(buffer, tokenBegin, newbuffer, 0, bufsize - tokenBegin);
63 System.arraycopy(buffer, 0, newbuffer,
64 bufsize - tokenBegin, bufpos);
65 buffer = newbuffer;
66
67 System.arraycopy(bufline, tokenBegin, newbufline, 0, bufsize - tokenBegin);
68 System.arraycopy(bufline, 0, newbufline, bufsize - tokenBegin, bufpos);
69 bufline = newbufline;
70
71 System.arraycopy(bufcolumn, tokenBegin, newbufcolumn, 0, bufsize - tokenBegin);
72 System.arraycopy(bufcolumn, 0, newbufcolumn, bufsize - tokenBegin, bufpos);
73 bufcolumn = newbufcolumn;
74
75 maxNextCharInd = (bufpos += (bufsize - tokenBegin));
76 }
77 else
78 {
79 System.arraycopy(buffer, tokenBegin, newbuffer, 0, bufsize - tokenBegin);
80 buffer = newbuffer;
81
82 System.arraycopy(bufline, tokenBegin, newbufline, 0, bufsize - tokenBegin);
83 bufline = newbufline;
84
85 System.arraycopy(bufcolumn, tokenBegin, newbufcolumn, 0, bufsize - tokenBegin);
86 bufcolumn = newbufcolumn;
87
88 maxNextCharInd = (bufpos -= tokenBegin);
89 }
90 }
91 catch (Throwable t)
92 {
93 throw new Error (t.getMessage());
94 }
95
96
97 bufsize += 2048;
98 available = bufsize;
99 tokenBegin = 0;
100 }
101
102 protected void FillBuff() throws java.io.IOException
103 {
104 if (maxNextCharInd == available)
105 {
106 if (available == bufsize)
107 {
108 if (tokenBegin > 2048)
109 {
110 bufpos = maxNextCharInd = 0;
111 available = tokenBegin;
112 }
113 else if (tokenBegin < 0)
114 bufpos = maxNextCharInd = 0;
115 else
116 ExpandBuff(false);
117 }
118 else if (available > tokenBegin)
119 available = bufsize;
120 else if ((tokenBegin - available) < 2048)
121 ExpandBuff(true);
122 else
123 available = tokenBegin;
124 }
125
126 int i;
127 try {
128 if ((i = inputStream.read(buffer, maxNextCharInd,
129 available - maxNextCharInd)) == -1)
130 {
131 inputStream.close();
132 throw new java.io.IOException ();
133 }
134 else
135 maxNextCharInd += i;
136 return;
137 }
138 catch(java.io.IOException e) {
139 --bufpos;
140 backup(0);
141 if (tokenBegin == -1)
142 tokenBegin = bufpos;
143 throw e;
144 }
145 }
146
147 public char BeginToken() throws java.io.IOException
148 {
149 tokenBegin = -1;
150 char c = readChar();
151 tokenBegin = bufpos;
152
153 return c;
154 }
155
156 protected void UpdateLineColumn(char c)
157 {
158 column++;
159
160 if (prevCharIsLF)
161 {
162 prevCharIsLF = false;
163 line += (column = 1);
164 }
165 else if (prevCharIsCR)
166 {
167 prevCharIsCR = false;
168 if (c == '\n')
169 {
170 prevCharIsLF = true;
171 }
172 else
173 line += (column = 1);
174 }
175
176 switch (c)
177 {
178 case '\r' :
179 prevCharIsCR = true;
180 break;
181 case '\n' :
182 prevCharIsLF = true;
183 break;
184 case '\t' :
185 column--;
186 column += (8 - (column & 07));
187 break;
188 default :
189 break;
190 }
191
192 bufline[bufpos] = line;
193 bufcolumn[bufpos] = column;
194 }
195
196 public char readChar() throws java.io.IOException
197 {
198 if (inBuf > 0)
199 {
200 --inBuf;
201
202 if (++bufpos == bufsize)
203 bufpos = 0;
204
205 return buffer[bufpos];
206 }
207
208 if (++bufpos >= maxNextCharInd)
209 FillBuff();
210
211 char c = buffer[bufpos];
212
213 UpdateLineColumn(c);
214 return (c);
215 }
216
217
221
222 public int getColumn() {
223 return bufcolumn[bufpos];
224 }
225
226
230
231 public int getLine() {
232 return bufline[bufpos];
233 }
234
235 public int getEndColumn() {
236 return bufcolumn[bufpos];
237 }
238
239 public int getEndLine() {
240 return bufline[bufpos];
241 }
242
243 public int getBeginColumn() {
244 return bufcolumn[tokenBegin];
245 }
246
247 public int getBeginLine() {
248 return bufline[tokenBegin];
249 }
250
251 public void backup(int amount) {
252
253 inBuf += amount;
254 if ((bufpos -= amount) < 0)
255 bufpos += bufsize;
256 }
257
258 public SimpleCharStream(java.io.Reader dstream, int startline,
259 int startcolumn, int buffersize)
260 {
261 inputStream = dstream;
262 line = startline;
263 column = startcolumn - 1;
264
265 available = bufsize = buffersize;
266 buffer = new char[buffersize];
267 bufline = new int[buffersize];
268 bufcolumn = new int[buffersize];
269 }
270
271 public SimpleCharStream(java.io.Reader dstream, int startline,
272 int startcolumn)
273 {
274 this(dstream, startline, startcolumn, 4096);
275 }
276
277 public SimpleCharStream(java.io.Reader dstream)
278 {
279 this(dstream, 1, 1, 4096);
280 }
281 public void ReInit(java.io.Reader dstream, int startline,
282 int startcolumn, int buffersize)
283 {
284 inputStream = dstream;
285 line = startline;
286 column = startcolumn - 1;
287
288 if (buffer == null || buffersize != buffer.length)
289 {
290 available = bufsize = buffersize;
291 buffer = new char[buffersize];
292 bufline = new int[buffersize];
293 bufcolumn = new int[buffersize];
294 }
295 prevCharIsLF = prevCharIsCR = false;
296 tokenBegin = inBuf = maxNextCharInd = 0;
297 bufpos = -1;
298 }
299
300 public void ReInit(java.io.Reader dstream, int startline,
301 int startcolumn)
302 {
303 ReInit(dstream, startline, startcolumn, 4096);
304 }
305
306 public void ReInit(java.io.Reader dstream)
307 {
308 ReInit(dstream, 1, 1, 4096);
309 }
310 public SimpleCharStream(java.io.InputStream dstream, int startline,
311 int startcolumn, int buffersize)
312 {
313 this(new java.io.InputStreamReader (dstream), startline, startcolumn, 4096);
314 }
315
316 public SimpleCharStream(java.io.InputStream dstream, int startline,
317 int startcolumn)
318 {
319 this(dstream, startline, startcolumn, 4096);
320 }
321
322 public SimpleCharStream(java.io.InputStream dstream)
323 {
324 this(dstream, 1, 1, 4096);
325 }
326
327 public void ReInit(java.io.InputStream dstream, int startline,
328 int startcolumn, int buffersize)
329 {
330 ReInit(new java.io.InputStreamReader (dstream), startline, startcolumn, 4096);
331 }
332
333 public void ReInit(java.io.InputStream dstream)
334 {
335 ReInit(dstream, 1, 1, 4096);
336 }
337 public void ReInit(java.io.InputStream dstream, int startline,
338 int startcolumn)
339 {
340 ReInit(dstream, startline, startcolumn, 4096);
341 }
342 public String GetImage()
343 {
344 if (bufpos >= tokenBegin)
345 return new String (buffer, tokenBegin, bufpos - tokenBegin + 1);
346 else
347 return new String (buffer, tokenBegin, bufsize - tokenBegin) +
348 new String (buffer, 0, bufpos + 1);
349 }
350
351 public char[] GetSuffix(int len)
352 {
353 char[] ret = new char[len];
354
355 if ((bufpos + 1) >= len)
356 System.arraycopy(buffer, bufpos - len + 1, ret, 0, len);
357 else
358 {
359 System.arraycopy(buffer, bufsize - (len - bufpos - 1), ret, 0,
360 len - bufpos - 1);
361 System.arraycopy(buffer, 0, ret, len - bufpos - 1, bufpos + 1);
362 }
363
364 return ret;
365 }
366
367 public void Done()
368 {
369 buffer = null;
370 bufline = null;
371 bufcolumn = null;
372 }
373
374
377 public void adjustBeginLineColumn(int newLine, int newCol)
378 {
379 int start = tokenBegin;
380 int len;
381
382 if (bufpos >= tokenBegin)
383 {
384 len = bufpos - tokenBegin + inBuf + 1;
385 }
386 else
387 {
388 len = bufsize - tokenBegin + bufpos + 1 + inBuf;
389 }
390
391 int i = 0, j = 0, k = 0;
392 int nextColDiff = 0, columnDiff = 0;
393
394 while (i < len &&
395 bufline[j = start % bufsize] == bufline[k = ++start % bufsize])
396 {
397 bufline[j] = newLine;
398 nextColDiff = columnDiff + bufcolumn[k] - bufcolumn[j];
399 bufcolumn[j] = newCol + columnDiff;
400 columnDiff = nextColDiff;
401 i++;
402 }
403
404 if (i < len)
405 {
406 bufline[j] = newLine++;
407 bufcolumn[j] = newCol + columnDiff;
408
409 while (i++ < len)
410 {
411 if (bufline[j = start % bufsize] != bufline[++start % bufsize])
412 bufline[j] = newLine++;
413 else
414 bufline[j] = newLine;
415 }
416 }
417
418 line = bufline[j];
419 column = bufcolumn[j];
420 }
421
422 }
423 |
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