1 /* Generated By:JavaCC: Do not edit this line. SimpleCharStream.java Version 4.0 */ 2 /* 3 * Copyright 2004 the mime4j project 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 package org.apache.james.mime4j.field.address.parser; 18 19 /** 20 * An implementation of interface CharStream, where the stream is assumed to 21 * contain only ASCII characters (without unicode processing). 22 */ 23 24 public class SimpleCharStream 25 { 26 public static final boolean staticFlag = false; 27 int bufsize; 28 int available; 29 int tokenBegin; 30 public int bufpos = -1; 31 protected int bufline[]; 32 protected int bufcolumn[]; 33 34 protected int column = 0; 35 protected int line = 1; 36 37 protected boolean prevCharIsCR = false; 38 protected boolean prevCharIsLF = false; 39 40 protected java.io.Reader inputStream; 41 42 protected char[] buffer; 43 protected int maxNextCharInd = 0; 44 protected int inBuf = 0; 45 protected int tabSize = 8; 46 47 protected void setTabSize(int i) { tabSize = i; } 48 protected int getTabSize(int i) { return tabSize; } 49 50 51 protected void ExpandBuff(boolean wrapAround) 52 { 53 char[] newbuffer = new char[bufsize + 2048]; 54 int newbufline[] = new int[bufsize + 2048]; 55 int newbufcolumn[] = new int[bufsize + 2048]; 56 57 try 58 { 59 if (wrapAround) 60 { 61 System.arraycopy(buffer, tokenBegin, newbuffer, 0, bufsize - tokenBegin); 62 System.arraycopy(buffer, 0, newbuffer, 63 bufsize - tokenBegin, bufpos); 64 buffer = newbuffer; 65 66 System.arraycopy(bufline, tokenBegin, newbufline, 0, bufsize - tokenBegin); 67 System.arraycopy(bufline, 0, newbufline, bufsize - tokenBegin, bufpos); 68 bufline = newbufline; 69 70 System.arraycopy(bufcolumn, tokenBegin, newbufcolumn, 0, bufsize - tokenBegin); 71 System.arraycopy(bufcolumn, 0, newbufcolumn, bufsize - tokenBegin, bufpos); 72 bufcolumn = newbufcolumn; 73 74 maxNextCharInd = (bufpos += (bufsize - tokenBegin)); 75 } 76 else 77 { 78 System.arraycopy(buffer, tokenBegin, newbuffer, 0, bufsize - tokenBegin); 79 buffer = newbuffer; 80 81 System.arraycopy(bufline, tokenBegin, newbufline, 0, bufsize - tokenBegin); 82 bufline = newbufline; 83 84 System.arraycopy(bufcolumn, tokenBegin, newbufcolumn, 0, bufsize - tokenBegin); 85 bufcolumn = newbufcolumn; 86 87 maxNextCharInd = (bufpos -= tokenBegin); 88 } 89 } 90 catch (Throwable t) 91 { 92 throw new Error(t.getMessage()); 93 } 94 95 96 bufsize += 2048; 97 available = bufsize; 98 tokenBegin = 0; 99 } 100 101 protected void FillBuff() throws java.io.IOException 102 { 103 if (maxNextCharInd == available) 104 { 105 if (available == bufsize) 106 { 107 if (tokenBegin > 2048) 108 { 109 bufpos = maxNextCharInd = 0; 110 available = tokenBegin; 111 } 112 else if (tokenBegin < 0) 113 bufpos = maxNextCharInd = 0; 114 else 115 ExpandBuff(false); 116 } 117 else if (available > tokenBegin) 118 available = bufsize; 119 else if ((tokenBegin - available) < 2048) 120 ExpandBuff(true); 121 else 122 available = tokenBegin; 123 } 124 125 int i; 126 try { 127 if ((i = inputStream.read(buffer, maxNextCharInd, 128 available - maxNextCharInd)) == -1) 129 { 130 inputStream.close(); 131 throw new java.io.IOException(); 132 } 133 else 134 maxNextCharInd += i; 135 return; 136 } 137 catch(java.io.IOException e) { 138 --bufpos; 139 backup(0); 140 if (tokenBegin == -1) 141 tokenBegin = bufpos; 142 throw e; 143 } 144 } 145 146 public char BeginToken() throws java.io.IOException 147 { 148 tokenBegin = -1; 149 char c = readChar(); 150 tokenBegin = bufpos; 151 152 return c; 153 } 154 155 protected void UpdateLineColumn(char c) 156 { 157 column++; 158 159 if (prevCharIsLF) 160 { 161 prevCharIsLF = false; 162 line += (column = 1); 163 } 164 else if (prevCharIsCR) 165 { 166 prevCharIsCR = false; 167 if (c == '\n') 168 { 169 prevCharIsLF = true; 170 } 171 else 172 line += (column = 1); 173 } 174 175 switch (c) 176 { 177 case '\r' : 178 prevCharIsCR = true; 179 break; 180 case '\n' : 181 prevCharIsLF = true; 182 break; 183 case '\t' : 184 column--; 185 column += (tabSize - (column % tabSize)); 186 break; 187 default : 188 break; 189 } 190 191 bufline[bufpos] = line; 192 bufcolumn[bufpos] = column; 193 } 194 195 public char readChar() throws java.io.IOException 196 { 197 if (inBuf > 0) 198 { 199 --inBuf; 200 201 if (++bufpos == bufsize) 202 bufpos = 0; 203 204 return buffer[bufpos]; 205 } 206 207 if (++bufpos >= maxNextCharInd) 208 FillBuff(); 209 210 char c = buffer[bufpos]; 211 212 UpdateLineColumn(c); 213 return (c); 214 } 215 216 /** 217 * @deprecated 218 * @see #getEndColumn 219 */ 220 @Deprecated 221 public int getColumn() { 222 return bufcolumn[bufpos]; 223 } 224 225 /** 226 * @deprecated 227 * @see #getEndLine 228 */ 229 @Deprecated 230 public int getLine() { 231 return bufline[bufpos]; 232 } 233 234 public int getEndColumn() { 235 return bufcolumn[bufpos]; 236 } 237 238 public int getEndLine() { 239 return bufline[bufpos]; 240 } 241 242 public int getBeginColumn() { 243 return bufcolumn[tokenBegin]; 244 } 245 246 public int getBeginLine() { 247 return bufline[tokenBegin]; 248 } 249 250 public void backup(int amount) { 251 252 inBuf += amount; 253 if ((bufpos -= amount) < 0) 254 bufpos += bufsize; 255 } 256 257 public SimpleCharStream(java.io.Reader dstream, int startline, 258 int startcolumn, int buffersize) 259 { 260 inputStream = dstream; 261 line = startline; 262 column = startcolumn - 1; 263 264 available = bufsize = buffersize; 265 buffer = new char[buffersize]; 266 bufline = new int[buffersize]; 267 bufcolumn = new int[buffersize]; 268 } 269 270 public SimpleCharStream(java.io.Reader dstream, int startline, 271 int startcolumn) 272 { 273 this(dstream, startline, startcolumn, 4096); 274 } 275 276 public SimpleCharStream(java.io.Reader dstream) 277 { 278 this(dstream, 1, 1, 4096); 279 } 280 public void ReInit(java.io.Reader dstream, int startline, 281 int startcolumn, int buffersize) 282 { 283 inputStream = dstream; 284 line = startline; 285 column = startcolumn - 1; 286 287 if (buffer == null || buffersize != buffer.length) 288 { 289 available = bufsize = buffersize; 290 buffer = new char[buffersize]; 291 bufline = new int[buffersize]; 292 bufcolumn = new int[buffersize]; 293 } 294 prevCharIsLF = prevCharIsCR = false; 295 tokenBegin = inBuf = maxNextCharInd = 0; 296 bufpos = -1; 297 } 298 299 public void ReInit(java.io.Reader dstream, int startline, 300 int startcolumn) 301 { 302 ReInit(dstream, startline, startcolumn, 4096); 303 } 304 305 public void ReInit(java.io.Reader dstream) 306 { 307 ReInit(dstream, 1, 1, 4096); 308 } 309 public SimpleCharStream(java.io.InputStream dstream, String encoding, int startline, 310 int startcolumn, int buffersize) throws java.io.UnsupportedEncodingException 311 { 312 this(encoding == null ? new java.io.InputStreamReader(dstream) : new java.io.InputStreamReader(dstream, encoding), startline, startcolumn, buffersize); 313 } 314 315 public SimpleCharStream(java.io.InputStream dstream, int startline, 316 int startcolumn, int buffersize) 317 { 318 this(new java.io.InputStreamReader(dstream), startline, startcolumn, buffersize); 319 } 320 321 public SimpleCharStream(java.io.InputStream dstream, String encoding, int startline, 322 int startcolumn) throws java.io.UnsupportedEncodingException 323 { 324 this(dstream, encoding, startline, startcolumn, 4096); 325 } 326 327 public SimpleCharStream(java.io.InputStream dstream, int startline, 328 int startcolumn) 329 { 330 this(dstream, startline, startcolumn, 4096); 331 } 332 333 public SimpleCharStream(java.io.InputStream dstream, String encoding) throws java.io.UnsupportedEncodingException 334 { 335 this(dstream, encoding, 1, 1, 4096); 336 } 337 338 public SimpleCharStream(java.io.InputStream dstream) 339 { 340 this(dstream, 1, 1, 4096); 341 } 342 343 public void ReInit(java.io.InputStream dstream, String encoding, int startline, 344 int startcolumn, int buffersize) throws java.io.UnsupportedEncodingException 345 { 346 ReInit(encoding == null ? new java.io.InputStreamReader(dstream) : new java.io.InputStreamReader(dstream, encoding), startline, startcolumn, buffersize); 347 } 348 349 public void ReInit(java.io.InputStream dstream, int startline, 350 int startcolumn, int buffersize) 351 { 352 ReInit(new java.io.InputStreamReader(dstream), startline, startcolumn, buffersize); 353 } 354 355 public void ReInit(java.io.InputStream dstream, String encoding) throws java.io.UnsupportedEncodingException 356 { 357 ReInit(dstream, encoding, 1, 1, 4096); 358 } 359 360 public void ReInit(java.io.InputStream dstream) 361 { 362 ReInit(dstream, 1, 1, 4096); 363 } 364 public void ReInit(java.io.InputStream dstream, String encoding, int startline, 365 int startcolumn) throws java.io.UnsupportedEncodingException 366 { 367 ReInit(dstream, encoding, startline, startcolumn, 4096); 368 } 369 public void ReInit(java.io.InputStream dstream, int startline, 370 int startcolumn) 371 { 372 ReInit(dstream, startline, startcolumn, 4096); 373 } 374 public String GetImage() 375 { 376 if (bufpos >= tokenBegin) 377 return new String(buffer, tokenBegin, bufpos - tokenBegin + 1); 378 else 379 return new String(buffer, tokenBegin, bufsize - tokenBegin) + 380 new String(buffer, 0, bufpos + 1); 381 } 382 383 public char[] GetSuffix(int len) 384 { 385 char[] ret = new char[len]; 386 387 if ((bufpos + 1) >= len) 388 System.arraycopy(buffer, bufpos - len + 1, ret, 0, len); 389 else 390 { 391 System.arraycopy(buffer, bufsize - (len - bufpos - 1), ret, 0, 392 len - bufpos - 1); 393 System.arraycopy(buffer, 0, ret, len - bufpos - 1, bufpos + 1); 394 } 395 396 return ret; 397 } 398 399 public void Done() 400 { 401 buffer = null; 402 bufline = null; 403 bufcolumn = null; 404 } 405 406 /** 407 * Method to adjust line and column numbers for the start of a token. 408 */ 409 public void adjustBeginLineColumn(int newLine, int newCol) 410 { 411 int start = tokenBegin; 412 int len; 413 414 if (bufpos >= tokenBegin) 415 { 416 len = bufpos - tokenBegin + inBuf + 1; 417 } 418 else 419 { 420 len = bufsize - tokenBegin + bufpos + 1 + inBuf; 421 } 422 423 int i = 0, j = 0, k = 0; 424 int nextColDiff = 0, columnDiff = 0; 425 426 while (i < len && 427 bufline[j = start % bufsize] == bufline[k = ++start % bufsize]) 428 { 429 bufline[j] = newLine; 430 nextColDiff = columnDiff + bufcolumn[k] - bufcolumn[j]; 431 bufcolumn[j] = newCol + columnDiff; 432 columnDiff = nextColDiff; 433 i++; 434 } 435 436 if (i < len) 437 { 438 bufline[j] = newLine++; 439 bufcolumn[j] = newCol + columnDiff; 440 441 while (i++ < len) 442 { 443 if (bufline[j = start % bufsize] != bufline[++start % bufsize]) 444 bufline[j] = newLine++; 445 else 446 bufline[j] = newLine; 447 } 448 } 449 450 line = bufline[j]; 451 column = bufcolumn[j]; 452 } 453 454 } 455