| 1 | /* Generated by: ParserGeneratorCC: Do not edit this line. AbstractCharStream.java Version 1.1 */ |
|---|---|
| 2 | /* ParserGeneratorCCOptions:SUPPORT_CLASS_VISIBILITY_PUBLIC=true */ |
| 3 | /* |
| 4 | * Copyright (C) 2007-2010 Júlio Vilmar Gesser. |
| 5 | * Copyright (C) 2011, 2013-2020 The JavaParser Team. |
| 6 | * |
| 7 | * This file is part of JavaParser. |
| 8 | * |
| 9 | * JavaParser can be used either under the terms of |
| 10 | * a) the GNU Lesser General Public License as published by |
| 11 | * the Free Software Foundation, either version 3 of the License, or |
| 12 | * (at your option) any later version. |
| 13 | * b) the terms of the Apache License |
| 14 | * |
| 15 | * You should have received a copy of both licenses in LICENCE.LGPL and |
| 16 | * LICENCE.APACHE. Please refer to those files for details. |
| 17 | * |
| 18 | * JavaParser is distributed in the hope that it will be useful, |
| 19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 21 | * GNU Lesser General Public License for more details. |
| 22 | */ |
| 23 | package com.github.javaparser; |
| 24 | |
| 25 | /** |
| 26 | * An implementation of interface CharStream, where the stream is assumed to |
| 27 | * contain only ASCII characters (without unicode processing). |
| 28 | */ |
| 29 | |
| 30 | public |
| 31 | abstract class AbstractCharStream |
| 32 | implements CharStream |
| 33 | { |
| 34 | /** Default buffer size if nothing is specified */ |
| 35 | public static final int DEFAULT_BUF_SIZE = 4096; |
| 36 | |
| 37 | static final int hexval (final char c) throws java.io.IOException |
| 38 | { |
| 39 | switch (c) |
| 40 | { |
| 41 | case '0': |
| 42 | return 0; |
| 43 | case '1': |
| 44 | return 1; |
| 45 | case '2': |
| 46 | return 2; |
| 47 | case '3': |
| 48 | return 3; |
| 49 | case '4': |
| 50 | return 4; |
| 51 | case '5': |
| 52 | return 5; |
| 53 | case '6': |
| 54 | return 6; |
| 55 | case '7': |
| 56 | return 7; |
| 57 | case '8': |
| 58 | return 8; |
| 59 | case '9': |
| 60 | return 9; |
| 61 | case 'a': |
| 62 | case 'A': |
| 63 | return 10; |
| 64 | case 'b': |
| 65 | case 'B': |
| 66 | return 11; |
| 67 | case 'c': |
| 68 | case 'C': |
| 69 | return 12; |
| 70 | case 'd': |
| 71 | case 'D': |
| 72 | return 13; |
| 73 | case 'e': |
| 74 | case 'E': |
| 75 | return 14; |
| 76 | case 'f': |
| 77 | case 'F': |
| 78 | return 15; |
| 79 | default: |
| 80 | throw new java.io.IOException ("Invalid hex char '" + c + "' (=" + (int) c + ") provided!"); |
| 81 | } |
| 82 | } |
| 83 | |
| 84 | /** Tab size for formatting. Usually in the range 1 to 8. */ |
| 85 | private int m_nTabSize = 1; |
| 86 | |
| 87 | /** Internal circular buffer */ |
| 88 | protected char[] buffer; |
| 89 | |
| 90 | /** Overall buffer size - same as buffer.length */ |
| 91 | protected int bufsize; |
| 92 | |
| 93 | /** Current read position in buffer. */ |
| 94 | protected int bufpos; |
| 95 | |
| 96 | /** The number of unoccupied buffer array positions */ |
| 97 | protected int available; |
| 98 | |
| 99 | /** The first array index (of `buffer`) that the current token starts */ |
| 100 | protected int tokenBegin; |
| 101 | |
| 102 | /** Characters in the backup/pushBack buffer */ |
| 103 | protected int inBuf; |
| 104 | protected int maxNextCharInd; |
| 105 | |
| 106 | private int[] m_aBufLine; |
| 107 | private int[] m_aBufColumn; |
| 108 | |
| 109 | // Current line number |
| 110 | private int m_nLineNo; |
| 111 | // Current column number |
| 112 | private int m_nColumnNo; |
| 113 | |
| 114 | // Was the previous character a "\r" char? |
| 115 | private boolean m_bPrevCharIsCR; |
| 116 | // Was the previous character a "\n" char? |
| 117 | private boolean m_bPrevCharIsLF; |
| 118 | |
| 119 | // Is line/column tracking enabled? |
| 120 | private boolean m_bTrackLineColumn = true; |
| 121 | |
| 122 | |
| 123 | /** Constructor. */ |
| 124 | public AbstractCharStream(final int nStartLine, |
| 125 | final int nStartColumn, |
| 126 | final int nBufferSize) |
| 127 | { |
| 128 | reInit (nStartLine, nStartColumn, nBufferSize); |
| 129 | } |
| 130 | |
| 131 | /** Reinitialise. */ |
| 132 | public final void reInit(final int nStartLine, |
| 133 | final int nStartColumn, |
| 134 | final int nBufferSize) |
| 135 | { |
| 136 | m_nLineNo = nStartLine; |
| 137 | m_nColumnNo = nStartColumn - 1; |
| 138 | m_bPrevCharIsCR = false; |
| 139 | m_bPrevCharIsLF = false; |
| 140 | if (buffer == null || nBufferSize != buffer.length) |
| 141 | { |
| 142 | bufsize = nBufferSize; |
| 143 | available = nBufferSize; |
| 144 | buffer = new char[nBufferSize]; |
| 145 | m_aBufLine = new int[nBufferSize]; |
| 146 | m_aBufColumn = new int[nBufferSize]; |
| 147 | } |
| 148 | maxNextCharInd = 0; |
| 149 | inBuf = 0; |
| 150 | tokenBegin = 0; |
| 151 | bufpos = -1; |
| 152 | } |
| 153 | |
| 154 | /** |
| 155 | * Read from the underlying stream. |
| 156 | * @param aBuf the buffer to be filled |
| 157 | * @param nOfs The offset into the buffer. 0-based |
| 158 | * @param nLen Number of chars to read. |
| 159 | * @return Number of effective chars read, or -1 on error. |
| 160 | */ |
| 161 | protected abstract int streamRead (char[] aBuf, int nOfs, int nLen) throws java.io.IOException; |
| 162 | |
| 163 | /** |
| 164 | * Close the underlying stream. |
| 165 | * @throws java.io.IOException If closing fails. |
| 166 | */ |
| 167 | protected abstract void streamClose () throws java.io.IOException; |
| 168 | |
| 169 | // Override this method if you need more aggressive buffer size expansion |
| 170 | protected int getBufSizeAfterExpansion () |
| 171 | { |
| 172 | // Double the size by default |
| 173 | return bufsize * 2; |
| 174 | } |
| 175 | |
| 176 | protected void expandBuff (final boolean bWrapAround) |
| 177 | { |
| 178 | // Get the new buffer size |
| 179 | final int nNewBufSize = getBufSizeAfterExpansion (); |
| 180 | |
| 181 | final char[] newbuffer = new char[nNewBufSize]; |
| 182 | final int[] newbufline = new int[nNewBufSize]; |
| 183 | final int[] newbufcolumn = new int[nNewBufSize]; |
| 184 | |
| 185 | // Number of chars to be preserved |
| 186 | final int nPreservedChars = bufsize - tokenBegin; |
| 187 | |
| 188 | if (bWrapAround) |
| 189 | { |
| 190 | // Move from offset "tokenBegin" to offset 0 |
| 191 | // arraycopy(src, srcPos, dest, destPos, length) |
| 192 | |
| 193 | // copy the "tail end" to the "start" (index 0) of the new buffer array |
| 194 | System.arraycopy(buffer, tokenBegin, newbuffer, 0, nPreservedChars); |
| 195 | |
| 196 | // copy the remaining "wrap around" content of the buffer from the start of the original buffer (starting at srcPos index 0) |
| 197 | System.arraycopy(buffer, 0, newbuffer, nPreservedChars, bufpos); |
| 198 | |
| 199 | // swap the new buffer in place of the old buffer |
| 200 | buffer = newbuffer; |
| 201 | |
| 202 | System.arraycopy(m_aBufLine, tokenBegin, newbufline, 0, nPreservedChars); |
| 203 | System.arraycopy(m_aBufLine, 0, newbufline, nPreservedChars, bufpos); |
| 204 | m_aBufLine = newbufline; |
| 205 | |
| 206 | System.arraycopy(m_aBufColumn, tokenBegin, newbufcolumn, 0, nPreservedChars); |
| 207 | System.arraycopy(m_aBufColumn, 0, newbufcolumn, nPreservedChars, bufpos); |
| 208 | m_aBufColumn = newbufcolumn; |
| 209 | |
| 210 | bufpos += nPreservedChars; |
| 211 | maxNextCharInd = bufpos; |
| 212 | } |
| 213 | else |
| 214 | { |
| 215 | // Move from offset "tokenBegin" to offset 0 |
| 216 | |
| 217 | System.arraycopy(buffer, tokenBegin, newbuffer, 0, nPreservedChars); |
| 218 | buffer = newbuffer; |
| 219 | |
| 220 | System.arraycopy(m_aBufLine, tokenBegin, newbufline, 0, nPreservedChars); |
| 221 | m_aBufLine = newbufline; |
| 222 | |
| 223 | System.arraycopy(m_aBufColumn, tokenBegin, newbufcolumn, 0, nPreservedChars); |
| 224 | m_aBufColumn = newbufcolumn; |
| 225 | |
| 226 | bufpos -= tokenBegin; |
| 227 | maxNextCharInd = bufpos; |
| 228 | } |
| 229 | |
| 230 | // Increase buffer size |
| 231 | bufsize = nNewBufSize; |
| 232 | available = nNewBufSize; |
| 233 | tokenBegin = 0; |
| 234 | } |
| 235 | |
| 236 | protected final void internalAdjustBuffSize() |
| 237 | { |
| 238 | final int nHalfBufferSize = bufsize / 2; |
| 239 | if (available == bufsize) |
| 240 | { |
| 241 | if (tokenBegin < 0) |
| 242 | { |
| 243 | // If this method is called from "beginToken()" |
| 244 | // Just refill the buffer from the start |
| 245 | bufpos = 0; |
| 246 | maxNextCharInd = 0; |
| 247 | } |
| 248 | else |
| 249 | if (tokenBegin > nHalfBufferSize) |
| 250 | { |
| 251 | // The token started in the second half - fill the front part |
| 252 | bufpos = 0; |
| 253 | maxNextCharInd = 0; |
| 254 | |
| 255 | // Available bytes are > 50% |
| 256 | available = tokenBegin; |
| 257 | } |
| 258 | else |
| 259 | { |
| 260 | // Token starts in the first half |
| 261 | // just append to existing buffer |
| 262 | expandBuff (false); |
| 263 | } |
| 264 | } |
| 265 | else |
| 266 | { |
| 267 | // A token was read across array boundaries |
| 268 | if (available > tokenBegin) |
| 269 | { |
| 270 | available = bufsize; |
| 271 | } |
| 272 | else |
| 273 | if ((tokenBegin - available) < nHalfBufferSize) |
| 274 | { |
| 275 | expandBuff (true); |
| 276 | } |
| 277 | else |
| 278 | { |
| 279 | available = tokenBegin; |
| 280 | } |
| 281 | } |
| 282 | } |
| 283 | |
| 284 | protected void fillBuff() throws java.io.IOException |
| 285 | { |
| 286 | if (maxNextCharInd == available) |
| 287 | internalAdjustBuffSize(); |
| 288 | |
| 289 | try |
| 290 | { |
| 291 | // Read from underlying stream |
| 292 | final int nCharsRead = streamRead (buffer, maxNextCharInd, available - maxNextCharInd); |
| 293 | if (nCharsRead == -1) |
| 294 | { |
| 295 | // We reached the end of the file |
| 296 | streamClose (); |
| 297 | |
| 298 | // Caught down below and re-thrown |
| 299 | throw new java.io.IOException("PGCC end of stream"); |
| 300 | } |
| 301 | maxNextCharInd += nCharsRead; |
| 302 | } |
| 303 | catch (final java.io.IOException ex) |
| 304 | { |
| 305 | --bufpos; |
| 306 | // ?What is the reason of this? Backup of 0 does nothing |
| 307 | backup (0); |
| 308 | if (tokenBegin == -1) |
| 309 | { |
| 310 | // Error occurred in "beginToken()" |
| 311 | tokenBegin = bufpos; |
| 312 | } |
| 313 | throw ex; |
| 314 | } |
| 315 | } |
| 316 | |
| 317 | protected final void internalSetBufLineColumn (final int nLine, final int nColumn) |
| 318 | { |
| 319 | m_aBufLine[bufpos] = nLine; |
| 320 | m_aBufColumn[bufpos] = nColumn; |
| 321 | } |
| 322 | |
| 323 | protected final void internalUpdateLineColumn(final char c) |
| 324 | { |
| 325 | m_nColumnNo++; |
| 326 | |
| 327 | if (m_bPrevCharIsLF) |
| 328 | { |
| 329 | // It's a "\r\n" or "\n" |
| 330 | // Start of a new line |
| 331 | m_bPrevCharIsLF = false; |
| 332 | m_nColumnNo = 1; |
| 333 | m_nLineNo++; |
| 334 | } |
| 335 | else |
| 336 | if (m_bPrevCharIsCR) |
| 337 | { |
| 338 | m_bPrevCharIsCR = false; |
| 339 | if (c == '\n') |
| 340 | { |
| 341 | // It's a "\r\n" |
| 342 | m_bPrevCharIsLF = true; |
| 343 | } |
| 344 | else |
| 345 | { |
| 346 | // It's only a "\r" |
| 347 | m_nColumnNo = 1; |
| 348 | m_nLineNo++; |
| 349 | } |
| 350 | } |
| 351 | |
| 352 | switch (c) |
| 353 | { |
| 354 | case '\r': |
| 355 | m_bPrevCharIsCR = true; |
| 356 | break; |
| 357 | case '\n': |
| 358 | m_bPrevCharIsLF = true; |
| 359 | break; |
| 360 | case '\t': |
| 361 | m_nColumnNo--; |
| 362 | m_nColumnNo += (m_nTabSize - (m_nColumnNo % m_nTabSize)); |
| 363 | break; |
| 364 | } |
| 365 | |
| 366 | internalSetBufLineColumn (m_nLineNo, m_nColumnNo); |
| 367 | } |
| 368 | |
| 369 | public char readChar() throws java.io.IOException |
| 370 | { |
| 371 | if (inBuf > 0) |
| 372 | { |
| 373 | // Something is left from last backup |
| 374 | --inBuf; |
| 375 | |
| 376 | ++bufpos; |
| 377 | if (bufpos == bufsize) |
| 378 | { |
| 379 | // Buffer overflow |
| 380 | bufpos = 0; |
| 381 | } |
| 382 | |
| 383 | return buffer[bufpos]; |
| 384 | } |
| 385 | |
| 386 | ++bufpos; |
| 387 | if (bufpos >= maxNextCharInd) |
| 388 | fillBuff(); |
| 389 | |
| 390 | final char c = buffer[bufpos]; |
| 391 | |
| 392 | if (m_bTrackLineColumn) |
| 393 | internalUpdateLineColumn(c); |
| 394 | return c; |
| 395 | } |
| 396 | |
| 397 | public char beginToken() throws java.io.IOException |
| 398 | { |
| 399 | tokenBegin = -1; |
| 400 | final char c = readChar(); |
| 401 | tokenBegin = bufpos; |
| 402 | return c; |
| 403 | } |
| 404 | |
| 405 | public int getBeginColumn () |
| 406 | { |
| 407 | return m_aBufColumn[tokenBegin]; |
| 408 | } |
| 409 | |
| 410 | public int getBeginLine () |
| 411 | { |
| 412 | return m_aBufLine[tokenBegin]; |
| 413 | } |
| 414 | |
| 415 | public int getEndColumn () |
| 416 | { |
| 417 | return m_aBufColumn[bufpos]; |
| 418 | } |
| 419 | |
| 420 | public int getEndLine () |
| 421 | { |
| 422 | return m_aBufLine[bufpos]; |
| 423 | } |
| 424 | |
| 425 | public void backup (final int nAmount) |
| 426 | { |
| 427 | if (nAmount > bufsize) |
| 428 | throw new IllegalStateException ("Cannot back " + nAmount + " chars which is larger than the internal buffer size (" + bufsize + ")"); |
| 429 | |
| 430 | inBuf += nAmount; |
| 431 | bufpos -= nAmount; |
| 432 | if (bufpos < 0) |
| 433 | { |
| 434 | // Buffer underflow (modulo) |
| 435 | bufpos += bufsize; |
| 436 | } |
| 437 | } |
| 438 | |
| 439 | public String getImage() |
| 440 | { |
| 441 | if (bufpos >= tokenBegin) |
| 442 | { |
| 443 | // from tokenBegin to bufpos |
| 444 | return new String (buffer, tokenBegin, bufpos - tokenBegin + 1); |
| 445 | } |
| 446 | |
| 447 | // from tokenBegin to bufsize, and from 0 to bufpos |
| 448 | return new String (buffer, tokenBegin, bufsize - tokenBegin) + |
| 449 | new String (buffer, 0, bufpos + 1); |
| 450 | } |
| 451 | |
| 452 | public char[] getSuffix (final int len) |
| 453 | { |
| 454 | char[] ret = new char[len]; |
| 455 | if ((bufpos + 1) >= len) |
| 456 | { |
| 457 | // one piece |
| 458 | System.arraycopy(buffer, bufpos - len + 1, ret, 0, len); |
| 459 | } |
| 460 | else |
| 461 | { |
| 462 | // Wrap around |
| 463 | final int nPart1 = len - bufpos - 1; |
| 464 | System.arraycopy(buffer, bufsize - nPart1, ret, 0, nPart1); |
| 465 | System.arraycopy(buffer, 0, ret, nPart1, bufpos + 1); |
| 466 | } |
| 467 | return ret; |
| 468 | } |
| 469 | |
| 470 | public void done() |
| 471 | { |
| 472 | buffer = null; |
| 473 | m_aBufLine = null; |
| 474 | m_aBufColumn = null; |
| 475 | } |
| 476 | |
| 477 | public final int getTabSize() |
| 478 | { |
| 479 | return m_nTabSize; |
| 480 | } |
| 481 | |
| 482 | public final void setTabSize (final int nTabSize) |
| 483 | { |
| 484 | m_nTabSize = nTabSize; |
| 485 | } |
| 486 | |
| 487 | /** |
| 488 | * Method to adjust line and column numbers for the start of a token. |
| 489 | * This is used internally to |
| 490 | */ |
| 491 | public final void adjustBeginLineColumn(final int nNewLine, final int newCol) |
| 492 | { |
| 493 | int start = tokenBegin; |
| 494 | int newLine = nNewLine; |
| 495 | |
| 496 | int len; |
| 497 | if (bufpos >= tokenBegin) |
| 498 | { |
| 499 | len = bufpos - tokenBegin + inBuf + 1; |
| 500 | } |
| 501 | else |
| 502 | { |
| 503 | len = bufsize - tokenBegin + bufpos + 1 + inBuf; |
| 504 | } |
| 505 | |
| 506 | int i = 0; |
| 507 | int j = 0; |
| 508 | int k = 0; |
| 509 | int nextColDiff = 0; |
| 510 | int columnDiff = 0; |
| 511 | |
| 512 | // TODO disassemble meaning and split up |
| 513 | while (i < len && m_aBufLine[j = start % bufsize] == m_aBufLine[k = ++start % bufsize]) |
| 514 | { |
| 515 | m_aBufLine[j] = newLine; |
| 516 | nextColDiff = columnDiff + m_aBufColumn[k] - m_aBufColumn[j]; |
| 517 | m_aBufColumn[j] = newCol + columnDiff; |
| 518 | columnDiff = nextColDiff; |
| 519 | i++; |
| 520 | } |
| 521 | |
| 522 | if (i < len) |
| 523 | { |
| 524 | m_aBufLine[j] = newLine++; |
| 525 | m_aBufColumn[j] = newCol + columnDiff; |
| 526 | |
| 527 | while (i++ < len) |
| 528 | { |
| 529 | // TODO disassemble meaning and split up |
| 530 | if (m_aBufLine[j = start % bufsize] != m_aBufLine[++start % bufsize]) |
| 531 | m_aBufLine[j] = newLine++; |
| 532 | else |
| 533 | m_aBufLine[j] = newLine; |
| 534 | } |
| 535 | } |
| 536 | |
| 537 | m_nLineNo = m_aBufLine[j]; |
| 538 | m_nColumnNo = m_aBufColumn[j]; |
| 539 | } |
| 540 | |
| 541 | /** |
| 542 | * @return the current line number. 0-based. |
| 543 | */ |
| 544 | protected final int getLine () |
| 545 | { |
| 546 | return m_nLineNo; |
| 547 | } |
| 548 | |
| 549 | /** |
| 550 | * @return the current column number. 0-based. |
| 551 | */ |
| 552 | protected final int getColumn () |
| 553 | { |
| 554 | return m_nColumnNo; |
| 555 | } |
| 556 | |
| 557 | public final boolean isTrackLineColumn () |
| 558 | { |
| 559 | return m_bTrackLineColumn; |
| 560 | } |
| 561 | |
| 562 | public final void setTrackLineColumn (final boolean bTrackLineColumn) |
| 563 | { |
| 564 | m_bTrackLineColumn = bTrackLineColumn; |
| 565 | } |
| 566 | } |
| 567 | /* ParserGeneratorCC - OriginalChecksum=af6292cb319b03fbec025497678ca090 (do not edit this line) */ |
| 568 |
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