| 1 | package org.apache.velocity.runtime.parser; |
| 2 | |
| 3 | /** |
| 4 | * NOTE : This class was originally an ASCII_CharStream autogenerated |
| 5 | * by Javacc. It was then modified via changing class name with appropriate |
| 6 | * fixes for CTORS, and mods to readChar(). |
| 7 | * |
| 8 | * This is safe because we *always* use Reader with this class, and never a |
| 9 | * InputStream. This guarantees that we have a correct stream of 16-bit |
| 10 | * chars - all encoding transformations have been done elsewhere, so we |
| 11 | * believe that there is no risk in doing this. Time will tell :) |
| 12 | */ |
| 13 | |
| 14 | /** |
| 15 | * An implementation of interface CharStream, where the stream is assumed to |
| 16 | * contain only ASCII characters (without unicode processing). |
| 17 | */ |
| 18 | |
| 19 | public final class VelocityCharStream |
| 20 | implements CharStream |
| 21 | { |
| 22 | public static final boolean staticFlag = false; |
| 23 | int bufsize; |
| 24 | int available; |
| 25 | int tokenBegin; |
| 26 | public int bufpos = -1; |
| 27 | private int bufline[]; |
| 28 | private int bufcolumn[]; |
| 29 | |
| 30 | private int column = 0; |
| 31 | private int line = 1; |
| 32 | |
| 33 | private boolean prevCharIsCR = false; |
| 34 | private boolean prevCharIsLF = false; |
| 35 | |
| 36 | private java.io.Reader inputStream; |
| 37 | |
| 38 | private char[] buffer; |
| 39 | private int maxNextCharInd = 0; |
| 40 | private int inBuf = 0; |
| 41 | |
| 42 | private final void ExpandBuff(boolean wrapAround) |
| 43 | { |
| 44 | char[] newbuffer = new char[bufsize + 2048]; |
| 45 | int newbufline[] = new int[bufsize + 2048]; |
| 46 | int newbufcolumn[] = new int[bufsize + 2048]; |
| 47 | |
| 48 | try |
| 49 | { |
| 50 | if (wrapAround) |
| 51 | { |
| 52 | System.arraycopy(buffer, tokenBegin, newbuffer, 0, bufsize - tokenBegin); |
| 53 | System.arraycopy(buffer, 0, newbuffer, |
| 54 | bufsize - tokenBegin, bufpos); |
| 55 | buffer = newbuffer; |
| 56 | |
| 57 | System.arraycopy(bufline, tokenBegin, newbufline, 0, bufsize - tokenBegin); |
| 58 | System.arraycopy(bufline, 0, newbufline, bufsize - tokenBegin, bufpos); |
| 59 | bufline = newbufline; |
| 60 | |
| 61 | System.arraycopy(bufcolumn, tokenBegin, newbufcolumn, 0, bufsize - tokenBegin); |
| 62 | System.arraycopy(bufcolumn, 0, newbufcolumn, bufsize - tokenBegin, bufpos); |
| 63 | bufcolumn = newbufcolumn; |
| 64 | |
| 65 | maxNextCharInd = (bufpos += (bufsize - tokenBegin)); |
| 66 | } |
| 67 | else |
| 68 | { |
| 69 | System.arraycopy(buffer, tokenBegin, newbuffer, 0, bufsize - tokenBegin); |
| 70 | buffer = newbuffer; |
| 71 | |
| 72 | System.arraycopy(bufline, tokenBegin, newbufline, 0, bufsize - tokenBegin); |
| 73 | bufline = newbufline; |
| 74 | |
| 75 | System.arraycopy(bufcolumn, tokenBegin, newbufcolumn, 0, bufsize - tokenBegin); |
| 76 | bufcolumn = newbufcolumn; |
| 77 | |
| 78 | maxNextCharInd = (bufpos -= tokenBegin); |
| 79 | } |
| 80 | } |
| 81 | catch (Throwable t) |
| 82 | { |
| 83 | throw new Error(t.getMessage()); |
| 84 | } |
| 85 | |
| 86 | |
| 87 | bufsize += 2048; |
| 88 | available = bufsize; |
| 89 | tokenBegin = 0; |
| 90 | } |
| 91 | |
| 92 | private final void FillBuff() throws java.io.IOException |
| 93 | { |
| 94 | if (maxNextCharInd == available) |
| 95 | { |
| 96 | if (available == bufsize) |
| 97 | { |
| 98 | if (tokenBegin > 2048) |
| 99 | { |
| 100 | bufpos = maxNextCharInd = 0; |
| 101 | available = tokenBegin; |
| 102 | } |
| 103 | else if (tokenBegin < 0) |
| 104 | bufpos = maxNextCharInd = 0; |
| 105 | else |
| 106 | ExpandBuff(false); |
| 107 | } |
| 108 | else if (available > tokenBegin) |
| 109 | available = bufsize; |
| 110 | else if ((tokenBegin - available) < 2048) |
| 111 | ExpandBuff(true); |
| 112 | else |
| 113 | available = tokenBegin; |
| 114 | } |
| 115 | |
| 116 | int i; |
| 117 | try { |
| 118 | if ((i = inputStream.read(buffer, maxNextCharInd, |
| 119 | available - maxNextCharInd)) == -1) |
| 120 | { |
| 121 | inputStream.close(); |
| 122 | throw new java.io.IOException(); |
| 123 | } |
| 124 | else |
| 125 | maxNextCharInd += i; |
| 126 | return; |
| 127 | } |
| 128 | catch(java.io.IOException e) { |
| 129 | --bufpos; |
| 130 | backup(0); |
| 131 | if (tokenBegin == -1) |
| 132 | tokenBegin = bufpos; |
| 133 | throw e; |
| 134 | } |
| 135 | } |
| 136 | |
| 137 | public final char BeginToken() throws java.io.IOException |
| 138 | { |
| 139 | tokenBegin = -1; |
| 140 | char c = readChar(); |
| 141 | tokenBegin = bufpos; |
| 142 | |
| 143 | return c; |
| 144 | } |
| 145 | |
| 146 | private final void UpdateLineColumn(char c) |
| 147 | { |
| 148 | column++; |
| 149 | |
| 150 | if (prevCharIsLF) |
| 151 | { |
| 152 | prevCharIsLF = false; |
| 153 | line += (column = 1); |
| 154 | } |
| 155 | else if (prevCharIsCR) |
| 156 | { |
| 157 | prevCharIsCR = false; |
| 158 | if (c == '\n') |
| 159 | { |
| 160 | prevCharIsLF = true; |
| 161 | } |
| 162 | else |
| 163 | line += (column = 1); |
| 164 | } |
| 165 | |
| 166 | switch (c) |
| 167 | { |
| 168 | case '\r' : |
| 169 | prevCharIsCR = true; |
| 170 | break; |
| 171 | case '\n' : |
| 172 | prevCharIsLF = true; |
| 173 | break; |
| 174 | case '\t' : |
| 175 | column--; |
| 176 | column += (8 - (column & 07)); |
| 177 | break; |
| 178 | default : |
| 179 | break; |
| 180 | } |
| 181 | |
| 182 | bufline[bufpos] = line; |
| 183 | bufcolumn[bufpos] = column; |
| 184 | } |
| 185 | |
| 186 | public final char readChar() throws java.io.IOException |
| 187 | { |
| 188 | if (inBuf > 0) |
| 189 | { |
| 190 | --inBuf; |
| 191 | |
| 192 | /* |
| 193 | * was : return (char)((char)0xff & buffer[(bufpos == bufsize - 1) ? (bufpos = 0) : ++bufpos]); |
| 194 | */ |
| 195 | return buffer[(bufpos == bufsize - 1) ? (bufpos = 0) : ++bufpos]; |
| 196 | } |
| 197 | |
| 198 | if (++bufpos >= maxNextCharInd) |
| 199 | FillBuff(); |
| 200 | |
| 201 | /* |
| 202 | * was : char c = (char)((char)0xff & buffer[bufpos]); |
| 203 | */ |
| 204 | char c = buffer[bufpos]; |
| 205 | |
| 206 | UpdateLineColumn(c); |
| 207 | return (c); |
| 208 | } |
| 209 | |
| 210 | /** |
| 211 | * @deprecated |
| 212 | * @see #getEndColumn |
| 213 | */ |
| 214 | |
| 215 | public final int getColumn() { |
| 216 | return bufcolumn[bufpos]; |
| 217 | } |
| 218 | |
| 219 | /** |
| 220 | * @deprecated |
| 221 | * @see #getEndLine |
| 222 | */ |
| 223 | |
| 224 | public final int getLine() { |
| 225 | return bufline[bufpos]; |
| 226 | } |
| 227 | |
| 228 | public final int getEndColumn() { |
| 229 | return bufcolumn[bufpos]; |
| 230 | } |
| 231 | |
| 232 | public final int getEndLine() { |
| 233 | return bufline[bufpos]; |
| 234 | } |
| 235 | |
| 236 | public final int getBeginColumn() { |
| 237 | return bufcolumn[tokenBegin]; |
| 238 | } |
| 239 | |
| 240 | public final int getBeginLine() { |
| 241 | return bufline[tokenBegin]; |
| 242 | } |
| 243 | |
| 244 | public final void backup(int amount) { |
| 245 | |
| 246 | inBuf += amount; |
| 247 | if ((bufpos -= amount) < 0) |
| 248 | bufpos += bufsize; |
| 249 | } |
| 250 | |
| 251 | public VelocityCharStream(java.io.Reader dstream, int startline, |
| 252 | int startcolumn, int buffersize) |
| 253 | { |
| 254 | inputStream = dstream; |
| 255 | line = startline; |
| 256 | column = startcolumn - 1; |
| 257 | |
| 258 | available = bufsize = buffersize; |
| 259 | buffer = new char[buffersize]; |
| 260 | bufline = new int[buffersize]; |
| 261 | bufcolumn = new int[buffersize]; |
| 262 | } |
| 263 | |
| 264 | public VelocityCharStream(java.io.Reader dstream, int startline, |
| 265 | int startcolumn) |
| 266 | { |
| 267 | this(dstream, startline, startcolumn, 4096); |
| 268 | } |
| 269 | public void ReInit(java.io.Reader dstream, int startline, |
| 270 | int startcolumn, int buffersize) |
| 271 | { |
| 272 | inputStream = dstream; |
| 273 | line = startline; |
| 274 | column = startcolumn - 1; |
| 275 | |
| 276 | if (buffer == null || buffersize != buffer.length) |
| 277 | { |
| 278 | available = bufsize = buffersize; |
| 279 | buffer = new char[buffersize]; |
| 280 | bufline = new int[buffersize]; |
| 281 | bufcolumn = new int[buffersize]; |
| 282 | } |
| 283 | prevCharIsLF = prevCharIsCR = false; |
| 284 | tokenBegin = inBuf = maxNextCharInd = 0; |
| 285 | bufpos = -1; |
| 286 | } |
| 287 | |
| 288 | public void ReInit(java.io.Reader dstream, int startline, |
| 289 | int startcolumn) |
| 290 | { |
| 291 | ReInit(dstream, startline, startcolumn, 4096); |
| 292 | } |
| 293 | public VelocityCharStream(java.io.InputStream dstream, int startline, |
| 294 | int startcolumn, int buffersize) |
| 295 | { |
| 296 | this(new java.io.InputStreamReader(dstream), startline, startcolumn, 4096); |
| 297 | } |
| 298 | |
| 299 | public VelocityCharStream(java.io.InputStream dstream, int startline, |
| 300 | int startcolumn) |
| 301 | { |
| 302 | this(dstream, startline, startcolumn, 4096); |
| 303 | } |
| 304 | |
| 305 | public void ReInit(java.io.InputStream dstream, int startline, |
| 306 | int startcolumn, int buffersize) |
| 307 | { |
| 308 | ReInit(new java.io.InputStreamReader(dstream), startline, startcolumn, 4096); |
| 309 | } |
| 310 | public void ReInit(java.io.InputStream dstream, int startline, |
| 311 | int startcolumn) |
| 312 | { |
| 313 | ReInit(dstream, startline, startcolumn, 4096); |
| 314 | } |
| 315 | public final String GetImage() |
| 316 | { |
| 317 | if (bufpos >= tokenBegin) |
| 318 | return new String(buffer, tokenBegin, bufpos - tokenBegin + 1); |
| 319 | else |
| 320 | return new String(buffer, tokenBegin, bufsize - tokenBegin) + |
| 321 | new String(buffer, 0, bufpos + 1); |
| 322 | } |
| 323 | |
| 324 | public final char[] GetSuffix(int len) |
| 325 | { |
| 326 | char[] ret = new char[len]; |
| 327 | |
| 328 | if ((bufpos + 1) >= len) |
| 329 | System.arraycopy(buffer, bufpos - len + 1, ret, 0, len); |
| 330 | else |
| 331 | { |
| 332 | System.arraycopy(buffer, bufsize - (len - bufpos - 1), ret, 0, |
| 333 | len - bufpos - 1); |
| 334 | System.arraycopy(buffer, 0, ret, len - bufpos - 1, bufpos + 1); |
| 335 | } |
| 336 | |
| 337 | return ret; |
| 338 | } |
| 339 | |
| 340 | public void Done() |
| 341 | { |
| 342 | buffer = null; |
| 343 | bufline = null; |
| 344 | bufcolumn = null; |
| 345 | } |
| 346 | |
| 347 | /** |
| 348 | * Method to adjust line and column numbers for the start of a token.<BR> |
| 349 | */ |
| 350 | public void adjustBeginLineColumn(int newLine, int newCol) |
| 351 | { |
| 352 | int start = tokenBegin; |
| 353 | int len; |
| 354 | |
| 355 | if (bufpos >= tokenBegin) |
| 356 | { |
| 357 | len = bufpos - tokenBegin + inBuf + 1; |
| 358 | } |
| 359 | else |
| 360 | { |
| 361 | len = bufsize - tokenBegin + bufpos + 1 + inBuf; |
| 362 | } |
| 363 | |
| 364 | int i = 0, j = 0, k = 0; |
| 365 | int nextColDiff = 0, columnDiff = 0; |
| 366 | |
| 367 | while (i < len && |
| 368 | bufline[j = start % bufsize] == bufline[k = ++start % bufsize]) |
| 369 | { |
| 370 | bufline[j] = newLine; |
| 371 | nextColDiff = columnDiff + bufcolumn[k] - bufcolumn[j]; |
| 372 | bufcolumn[j] = newCol + columnDiff; |
| 373 | columnDiff = nextColDiff; |
| 374 | i++; |
| 375 | } |
| 376 | |
| 377 | if (i < len) |
| 378 | { |
| 379 | bufline[j] = newLine++; |
| 380 | bufcolumn[j] = newCol + columnDiff; |
| 381 | |
| 382 | while (i++ < len) |
| 383 | { |
| 384 | if (bufline[j = start % bufsize] != bufline[++start % bufsize]) |
| 385 | bufline[j] = newLine++; |
| 386 | else |
| 387 | bufline[j] = newLine; |
| 388 | } |
| 389 | } |
| 390 | |
| 391 | line = bufline[j]; |
| 392 | column = bufcolumn[j]; |
| 393 | } |
| 394 | |
| 395 | } |