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1
2 package org.w3c.flute.parser;
3
4
8
9 public final class Generic_CharStream implements CharStream
10 {
11 public static final boolean staticFlag = false;
12 int bufsize;
13 int available;
14 int tokenBegin;
15 public int bufpos = -1;
16 private int bufline[];
17 private int bufcolumn[];
18
19 private int column = 0;
20 private int line = 1;
21
22 private boolean prevCharIsCR = false;
23 private boolean prevCharIsLF = false;
24
25 private java.io.Reader  reader;
26
27 private char[] buffer;
28 private int maxNextCharInd = 0;
29 private int inBuf = 0;
30
31 private final void ExpandBuff(boolean wrapAround)
32 {
33 char[] newbuffer = new char[bufsize + 2048];
34 int newbufline[] = new int[bufsize + 2048];
35 int newbufcolumn[] = new int[bufsize + 2048];
36
37 try
38 {
39 if (wrapAround)
40 {
41 System.arraycopy(buffer, tokenBegin, newbuffer, 0, bufsize - tokenBegin);
42 System.arraycopy(buffer, 0, newbuffer,
43 bufsize - tokenBegin, bufpos);
44 buffer = newbuffer;
45
46 System.arraycopy(bufline, tokenBegin, newbufline, 0, bufsize - tokenBegin);
47 System.arraycopy(bufline, 0, newbufline, bufsize - tokenBegin, bufpos);
48 bufline = newbufline;
49
50 System.arraycopy(bufcolumn, tokenBegin, newbufcolumn, 0, bufsize - tokenBegin);
51 System.arraycopy(bufcolumn, 0, newbufcolumn, bufsize - tokenBegin, bufpos);
52 bufcolumn = newbufcolumn;
53
54 maxNextCharInd = (bufpos += (bufsize - tokenBegin));
55 }
56 else
57 {
58 System.arraycopy(buffer, tokenBegin, newbuffer, 0, bufsize - tokenBegin);
59 buffer = newbuffer;
60
61 System.arraycopy(bufline, tokenBegin, newbufline, 0, bufsize - tokenBegin);
62 bufline = newbufline;
63
64 System.arraycopy(bufcolumn, tokenBegin, newbufcolumn, 0, bufsize - tokenBegin);
65 bufcolumn = newbufcolumn;
66
67 maxNextCharInd = (bufpos -= tokenBegin);
68 }
69 }
70 catch (Throwable t)
71 {
72 throw new Error (t.getMessage());
73 }
74
75
76 bufsize += 2048;
77 available = bufsize;
78 tokenBegin = 0;
79 }
80
81 private final void FillBuff() throws java.io.IOException
82 {
83 if (maxNextCharInd == available)
84 {
85 if (available == bufsize)
86 {
87 if (tokenBegin > 2048)
88 {
89 bufpos = maxNextCharInd = 0;
90 available = tokenBegin;
91 }
92 else if (tokenBegin < 0)
93 bufpos = maxNextCharInd = 0;
94 else
95 ExpandBuff(false);
96 }
97 else if (available > tokenBegin)
98 available = bufsize;
99 else if ((tokenBegin - available) < 2048)
100 ExpandBuff(true);
101 else
102 available = tokenBegin;
103 }
104
105 int i;
106 try {
107 if ((i = reader.read(buffer, maxNextCharInd,
108 available - maxNextCharInd)) == -1)
109 {
110 reader.close();
111 throw new java.io.IOException ();
112 }
113 else
114 maxNextCharInd += i;
115 return;
116 }
117 catch(java.io.IOException e) {
118 --bufpos;
119 backup(0);
120 if (tokenBegin == -1)
121 tokenBegin = bufpos;
122 throw e;
123 }
124 }
125
126 public final char BeginToken() throws java.io.IOException
127 {
128 tokenBegin = -1;
129 char c = readChar();
130 tokenBegin = bufpos;
131
132 return c;
133 }
134
135 private final void UpdateLineColumn(char c)
136 {
137 column++;
138
139 if (prevCharIsLF)
140 {
141 prevCharIsLF = false;
142 line += (column = 1);
143 }
144 else if (prevCharIsCR)
145 {
146 prevCharIsCR = false;
147 if (c == '\n')
148 {
149 prevCharIsLF = true;
150 }
151 else
152 line += (column = 1);
153 }
154
155 switch (c)
156 {
157 case '\r' :
158 prevCharIsCR = true;
159 break;
160 case '\n' :
161 prevCharIsLF = true;
162 break;
163 case '\t' :
164 column--;
165 column += (8 - (column & 07));
166 break;
167 default :
168 break;
169 }
170
171 bufline[bufpos] = line;
172 bufcolumn[bufpos] = column;
173 }
174
175 public final char readChar() throws java.io.IOException
176 {
177 if (inBuf > 0)
178 {
179 --inBuf;
180 return (char)((char)0xff & buffer[(bufpos == bufsize - 1) ? (bufpos = 0) : ++bufpos]);
181 }
182
183 if (++bufpos >= maxNextCharInd)
184 FillBuff();
185
186 char c = (char)((char)0xff & buffer[bufpos]);
187
188 UpdateLineColumn(c);
189 return (c);
190 }
191
192
196
197 public final int getColumn() {
198 return bufcolumn[bufpos];
199 }
200
201
205
206 public final int getLine() {
207 return bufline[bufpos];
208 }
209
210 public final int getEndColumn() {
211 return bufcolumn[bufpos];
212 }
213
214 public final int getEndLine() {
215 return bufline[bufpos];
216 }
217
218 public final int getBeginColumn() {
219 return bufcolumn[tokenBegin];
220 }
221
222 public final int getBeginLine() {
223 return bufline[tokenBegin];
224 }
225
226 public final void backup(int amount) {
227
228 inBuf += amount;
229 if ((bufpos -= amount) < 0)
230 bufpos += bufsize;
231 }
232
233 public Generic_CharStream(java.io.Reader dstream, int startline,
234 int startcolumn, int buffersize)
235 {
236 reader = dstream;
237 line = startline;
238 column = startcolumn - 1;
239
240 available = bufsize = buffersize;
241 buffer = new char[buffersize];
242 bufline = new int[buffersize];
243 bufcolumn = new int[buffersize];
244 }
245
246 public Generic_CharStream(java.io.Reader dstream, int startline,
247 int startcolumn)
248 {
249 this(dstream, startline, startcolumn, 4096);
250 }
251 public void ReInit(java.io.Reader dstream, int startline,
252 int startcolumn, int buffersize)
253 {
254 reader = dstream;
255 line = startline;
256 column = startcolumn - 1;
257
258 if (buffer == null || buffersize != buffer.length)
259 {
260 available = bufsize = buffersize;
261 buffer = new char[buffersize];
262 bufline = new int[buffersize];
263 bufcolumn = new int[buffersize];
264 }
265 prevCharIsLF = prevCharIsCR = false;
266 tokenBegin = inBuf = maxNextCharInd = 0;
267 bufpos = -1;
268 }
269
270 public void ReInit(java.io.Reader dstream, int startline,
271 int startcolumn)
272 {
273 ReInit(dstream, startline, startcolumn, 4096);
274 }
275
276 public final String GetImage()
277 {
278 if (bufpos >= tokenBegin)
279 return new String (buffer, tokenBegin, bufpos - tokenBegin + 1);
280 else
281 return new String (buffer, tokenBegin, bufsize - tokenBegin) +
282 new String (buffer, 0, bufpos + 1);
283 }
284
285 public final char[] GetSuffix(int len)
286 {
287 char[] ret = new char[len];
288
289 if ((bufpos + 1) >= len)
290 System.arraycopy(buffer, bufpos - len + 1, ret, 0, len);
291 else
292 {
293 System.arraycopy(buffer, bufsize - (len - bufpos - 1), ret, 0,
294 len - bufpos - 1);
295 System.arraycopy(buffer, 0, ret, len - bufpos - 1, bufpos + 1);
296 }
297 return ret;
298 }
299
300 public void Done()
301 {
302 buffer = null;
303 bufline = null;
304 bufcolumn = null;
305 }
306
307
310 public void adjustBeginLineColumn(int newLine, int newCol)
311 {
312 int start = tokenBegin;
313 int len;
314
315 if (bufpos >= tokenBegin)
316 {
317 len = bufpos - tokenBegin + inBuf + 1;
318 }
319 else
320 {
321 len = bufsize - tokenBegin + bufpos + 1 + inBuf;
322 }
323
324 int i = 0, j = 0, k = 0;
325 int nextColDiff = 0, columnDiff = 0;
326
327 while (i < len &&
328 bufline[j = start % bufsize] == bufline[k = ++start % bufsize])
329 {
330 bufline[j] = newLine;
331 nextColDiff = columnDiff + bufcolumn[k] - bufcolumn[j];
332 bufcolumn[j] = newCol + columnDiff;
333 columnDiff = nextColDiff;
334 i++;
335 }
336
337 if (i < len)
338 {
339 bufline[j] = newLine++;
340 bufcolumn[j] = newCol + columnDiff;
341
342 while (i++ < len)
343 {
344 if (bufline[j = start % bufsize] != bufline[++start % bufsize])
345 bufline[j] = newLine++;
346 else
347 bufline[j] = newLine;
348 }
349 }
350
351 line = bufline[j];
352 column = bufcolumn[j];
353 }
354
355 }
356 |
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