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1
16
17
18 package org.apache.taglibs.standard.lang.jpath.expression;
19
20
24
25 public final class ASCII_CharStream
26 {
27 public static final boolean staticFlag = false;
28 int bufsize;
29 int available;
30 int tokenBegin;
31 public int bufpos = -1;
32 private int bufline[];
33 private int bufcolumn[];
34
35 private int column = 0;
36 private int line = 1;
37
38 private boolean prevCharIsCR = false;
39 private boolean prevCharIsLF = false;
40
41 private java.io.Reader  inputStream;
42
43 private char[] buffer;
44 private int maxNextCharInd = 0;
45 private int inBuf = 0;
46
47 private final void ExpandBuff(boolean wrapAround)
48 {
49 char[] newbuffer = new char[bufsize + 2048];
50 int newbufline[] = new int[bufsize + 2048];
51 int newbufcolumn[] = new int[bufsize + 2048];
52
53 try
54 {
55 if (wrapAround)
56 {
57 System.arraycopy(buffer, tokenBegin, newbuffer, 0, bufsize - tokenBegin);
58 System.arraycopy(buffer, 0, newbuffer,
59 bufsize - tokenBegin, bufpos);
60 buffer = newbuffer;
61
62 System.arraycopy(bufline, tokenBegin, newbufline, 0, bufsize - tokenBegin);
63 System.arraycopy(bufline, 0, newbufline, bufsize - tokenBegin, bufpos);
64 bufline = newbufline;
65
66 System.arraycopy(bufcolumn, tokenBegin, newbufcolumn, 0, bufsize - tokenBegin);
67 System.arraycopy(bufcolumn, 0, newbufcolumn, bufsize - tokenBegin, bufpos);
68 bufcolumn = newbufcolumn;
69
70 maxNextCharInd = (bufpos += (bufsize - tokenBegin));
71 }
72 else
73 {
74 System.arraycopy(buffer, tokenBegin, newbuffer, 0, bufsize - tokenBegin);
75 buffer = newbuffer;
76
77 System.arraycopy(bufline, tokenBegin, newbufline, 0, bufsize - tokenBegin);
78 bufline = newbufline;
79
80 System.arraycopy(bufcolumn, tokenBegin, newbufcolumn, 0, bufsize - tokenBegin);
81 bufcolumn = newbufcolumn;
82
83 maxNextCharInd = (bufpos -= tokenBegin);
84 }
85 }
86 catch (Throwable t)
87 {
88 throw new Error (t.getMessage());
89 }
90
91
92 bufsize += 2048;
93 available = bufsize;
94 tokenBegin = 0;
95 }
96
97 private final void FillBuff() throws java.io.IOException
98 {
99 if (maxNextCharInd == available)
100 {
101 if (available == bufsize)
102 {
103 if (tokenBegin > 2048)
104 {
105 bufpos = maxNextCharInd = 0;
106 available = tokenBegin;
107 }
108 else if (tokenBegin < 0)
109 bufpos = maxNextCharInd = 0;
110 else
111 ExpandBuff(false);
112 }
113 else if (available > tokenBegin)
114 available = bufsize;
115 else if ((tokenBegin - available) < 2048)
116 ExpandBuff(true);
117 else
118 available = tokenBegin;
119 }
120
121 int i;
122 try {
123 if ((i = inputStream.read(buffer, maxNextCharInd,
124 available - maxNextCharInd)) == -1)
125 {
126 inputStream.close();
127 throw new java.io.IOException ();
128 }
129 else
130 maxNextCharInd += i;
131 return;
132 }
133 catch(java.io.IOException e) {
134 --bufpos;
135 backup(0);
136 if (tokenBegin == -1)
137 tokenBegin = bufpos;
138 throw e;
139 }
140 }
141
142 public final char BeginToken() throws java.io.IOException
143 {
144 tokenBegin = -1;
145 char c = readChar();
146 tokenBegin = bufpos;
147
148 return c;
149 }
150
151 private final void UpdateLineColumn(char c)
152 {
153 column++;
154
155 if (prevCharIsLF)
156 {
157 prevCharIsLF = false;
158 line += (column = 1);
159 }
160 else if (prevCharIsCR)
161 {
162 prevCharIsCR = false;
163 if (c == '\n')
164 {
165 prevCharIsLF = true;
166 }
167 else
168 line += (column = 1);
169 }
170
171 switch (c)
172 {
173 case '\r' :
174 prevCharIsCR = true;
175 break;
176 case '\n' :
177 prevCharIsLF = true;
178 break;
179 case '\t' :
180 column--;
181 column += (8 - (column & 07));
182 break;
183 default :
184 break;
185 }
186
187 bufline[bufpos] = line;
188 bufcolumn[bufpos] = column;
189 }
190
191 public final char readChar() throws java.io.IOException
192 {
193 if (inBuf > 0)
194 {
195 --inBuf;
196 return (char)((char)0xff & buffer[(bufpos == bufsize - 1) ? (bufpos = 0) : ++bufpos]);
197 }
198
199 if (++bufpos >= maxNextCharInd)
200 FillBuff();
201
202 char c = (char)((char)0xff & buffer[bufpos]);
203
204 UpdateLineColumn(c);
205 return (c);
206 }
207
208
212
213 public final int getColumn() {
214 return bufcolumn[bufpos];
215 }
216
217
221
222 public final int getLine() {
223 return bufline[bufpos];
224 }
225
226 public final int getEndColumn() {
227 return bufcolumn[bufpos];
228 }
229
230 public final int getEndLine() {
231 return bufline[bufpos];
232 }
233
234 public final int getBeginColumn() {
235 return bufcolumn[tokenBegin];
236 }
237
238 public final int getBeginLine() {
239 return bufline[tokenBegin];
240 }
241
242 public final void backup(int amount) {
243
244 inBuf += amount;
245 if ((bufpos -= amount) < 0)
246 bufpos += bufsize;
247 }
248
249 public ASCII_CharStream(java.io.Reader dstream, int startline,
250 int startcolumn, int buffersize)
251 {
252 inputStream = dstream;
253 line = startline;
254 column = startcolumn - 1;
255
256 available = bufsize = buffersize;
257 buffer = new char[buffersize];
258 bufline = new int[buffersize];
259 bufcolumn = new int[buffersize];
260 }
261
262 public ASCII_CharStream(java.io.Reader dstream, int startline,
263 int startcolumn)
264 {
265 this(dstream, startline, startcolumn, 4096);
266 }
267 public void ReInit(java.io.Reader dstream, int startline,
268 int startcolumn, int buffersize)
269 {
270 inputStream = dstream;
271 line = startline;
272 column = startcolumn - 1;
273
274 if (buffer == null || buffersize != buffer.length)
275 {
276 available = bufsize = buffersize;
277 buffer = new char[buffersize];
278 bufline = new int[buffersize];
279 bufcolumn = new int[buffersize];
280 }
281 prevCharIsLF = prevCharIsCR = false;
282 tokenBegin = inBuf = maxNextCharInd = 0;
283 bufpos = -1;
284 }
285
286 public void ReInit(java.io.Reader dstream, int startline,
287 int startcolumn)
288 {
289 ReInit(dstream, startline, startcolumn, 4096);
290 }
291 public ASCII_CharStream(java.io.InputStream dstream, int startline,
292 int startcolumn, int buffersize)
293 {
294 this(new java.io.InputStreamReader (dstream), startline, startcolumn, 4096);
295 }
296
297 public ASCII_CharStream(java.io.InputStream dstream, int startline,
298 int startcolumn)
299 {
300 this(dstream, startline, startcolumn, 4096);
301 }
302
303 public void ReInit(java.io.InputStream dstream, int startline,
304 int startcolumn, int buffersize)
305 {
306 ReInit(new java.io.InputStreamReader (dstream), startline, startcolumn, 4096);
307 }
308 public void ReInit(java.io.InputStream dstream, int startline,
309 int startcolumn)
310 {
311 ReInit(dstream, startline, startcolumn, 4096);
312 }
313 public final String GetImage()
314 {
315 if (bufpos >= tokenBegin)
316 return new String (buffer, tokenBegin, bufpos - tokenBegin + 1);
317 else
318 return new String (buffer, tokenBegin, bufsize - tokenBegin) +
319 new String (buffer, 0, bufpos + 1);
320 }
321
322 public final char[] GetSuffix(int len)
323 {
324 char[] ret = new char[len];
325
326 if ((bufpos + 1) >= len)
327 System.arraycopy(buffer, bufpos - len + 1, ret, 0, len);
328 else
329 {
330 System.arraycopy(buffer, bufsize - (len - bufpos - 1), ret, 0,
331 len - bufpos - 1);
332 System.arraycopy(buffer, 0, ret, len - bufpos - 1, bufpos + 1);
333 }
334
335 return ret;
336 }
337
338 public void Done()
339 {
340 buffer = null;
341 bufline = null;
342 bufcolumn = null;
343 }
344
345
348 public void adjustBeginLineColumn(int newLine, int newCol)
349 {
350 int start = tokenBegin;
351 int len;
352
353 if (bufpos >= tokenBegin)
354 {
355 len = bufpos - tokenBegin + inBuf + 1;
356 }
357 else
358 {
359 len = bufsize - tokenBegin + bufpos + 1 + inBuf;
360 }
361
362 int i = 0, j = 0, k = 0;
363 int nextColDiff = 0, columnDiff = 0;
364
365 while (i < len &&
366 bufline[j = start % bufsize] == bufline[k = ++start % bufsize])
367 {
368 bufline[j] = newLine;
369 nextColDiff = columnDiff + bufcolumn[k] - bufcolumn[j];
370 bufcolumn[j] = newCol + columnDiff;
371 columnDiff = nextColDiff;
372 i++;
373 }
374
375 if (i < len)
376 {
377 bufline[j] = newLine++;
378 bufcolumn[j] = newCol + columnDiff;
379
380 while (i++ < len)
381 {
382 if (bufline[j = start % bufsize] != bufline[++start % bufsize])
383 bufline[j] = newLine++;
384 else
385 bufline[j] = newLine;
386 }
387 }
388
389 line = bufline[j];
390 column = bufcolumn[j];
391 }
392
393 }
394 |
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