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package org.webmacro.parser; |
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public final class ASCII_CharStream |
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{ |
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private static final class Buffer |
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{ |
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int size; |
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int dataLen, curPos; |
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char[] buffer; |
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int[] bufline, bufcolumn; |
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public Buffer (int n) |
| 24 | 0 | { |
| 25 | 0 | size = n; |
| 26 | 0 | dataLen = 0; |
| 27 | 0 | curPos = -1; |
| 28 | 0 | buffer = new char[n]; |
| 29 | 0 | bufline = new int[n]; |
| 30 | 0 | bufcolumn = new int[n]; |
| 31 | 0 | } |
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public void expand (int n) |
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{ |
| 35 | 0 | char[] newbuffer = new char[size + n]; |
| 36 | 0 | int newbufline[] = new int[size + n]; |
| 37 | 0 | int newbufcolumn[] = new int[size + n]; |
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try |
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{ |
| 41 | 0 | System.arraycopy(buffer, 0, newbuffer, 0, size); |
| 42 | 0 | buffer = newbuffer; |
| 43 | 0 | System.arraycopy(bufline, 0, newbufline, 0, size); |
| 44 | 0 | bufline = newbufline; |
| 45 | 0 | System.arraycopy(bufcolumn, 0, newbufcolumn, 0, size); |
| 46 | 0 | bufcolumn = newbufcolumn; |
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} |
| 48 | 0 | catch (Throwable t) |
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{ |
| 50 | 0 | throw new Error(t.getMessage()); |
| 51 | 0 | } |
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| 53 | 0 | size += n; |
| 54 | 0 | } |
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} |
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private Buffer bufA, bufB, curBuf, otherBuf, tokenBeginBuf; |
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private int tokenBeginPos; |
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private int backupChars; |
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public static final boolean staticFlag = false; |
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| 63 | 0 | private int column = 0; |
| 64 | 0 | private int line = 1; |
| 65 | 0 | private boolean prevCharIsCR = false; |
| 66 | 0 | private boolean prevCharIsLF = false; |
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private java.io.Reader inputStream; |
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private final void swapBuf () |
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{ |
| 72 | 0 | Buffer tmp = curBuf; |
| 73 | 0 | curBuf = otherBuf; |
| 74 | 0 | otherBuf = tmp; |
| 75 | 0 | } |
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private final void FillBuff () throws java.io.IOException |
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{ |
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| 88 | 0 | if (curBuf.size - curBuf.dataLen < 2048) |
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{ |
| 90 | 0 | if (tokenBeginPos >= 0 |
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&& ((tokenBeginBuf == curBuf && tokenBeginPos < 2048) |
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|| tokenBeginBuf != curBuf)) |
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{ |
| 94 | 0 | curBuf.expand(2048); |
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} |
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else |
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{ |
| 98 | 0 | swapBuf(); |
| 99 | 0 | curBuf.curPos = curBuf.dataLen = 0; |
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} |
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} |
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try |
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{ |
| 105 | 0 | int i = inputStream.read(curBuf.buffer, curBuf.dataLen, |
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curBuf.size - curBuf.dataLen); |
| 107 | 0 | if (i == -1) |
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{ |
| 109 | 0 | inputStream.close(); |
| 110 | 0 | throw new java.io.IOException(); |
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} |
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else |
| 113 | 0 | curBuf.dataLen += i; |
| 114 | 0 | return; |
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} |
| 116 | 0 | catch (java.io.IOException e) |
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{ |
| 118 | 0 | if (curBuf.curPos > 0) |
| 119 | 0 | --curBuf.curPos; |
| 120 | 0 | if (tokenBeginPos == -1) |
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{ |
| 122 | 0 | tokenBeginPos = curBuf.curPos; |
| 123 | 0 | tokenBeginBuf = curBuf; |
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} |
| 125 | 0 | throw e; |
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} |
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} |
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public final char BeginToken () throws java.io.IOException |
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{ |
| 131 | 0 | tokenBeginPos = -1; |
| 132 | 0 | char c = readChar(); |
| 133 | 0 | tokenBeginBuf = curBuf; |
| 134 | 0 | tokenBeginPos = curBuf.curPos; |
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| 136 | 0 | return c; |
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} |
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private final void UpdateLineColumn (char c) |
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{ |
| 141 | 0 | column++; |
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| 143 | 0 | if (prevCharIsLF) |
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{ |
| 145 | 0 | prevCharIsLF = false; |
| 146 | 0 | line += (column = 1); |
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} |
| 148 | 0 | else if (prevCharIsCR) |
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{ |
| 150 | 0 | prevCharIsCR = false; |
| 151 | 0 | if (c == '\n') |
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{ |
| 153 | 0 | prevCharIsLF = true; |
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} |
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else |
| 156 | 0 | line += (column = 1); |
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} |
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|
| 159 | 0 | switch (c) |
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{ |
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case '\r': |
| 162 | 0 | prevCharIsCR = true; |
| 163 | 0 | break; |
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case '\n': |
| 165 | 0 | prevCharIsLF = true; |
| 166 | 0 | break; |
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case '\t': |
| 168 | 0 | column--; |
| 169 | 0 | column += (8 - (column & 07)); |
| 170 | 0 | break; |
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default : |
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break; |
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} |
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| 175 | 0 | curBuf.bufline[curBuf.curPos] = line; |
| 176 | 0 | curBuf.bufcolumn[curBuf.curPos] = column; |
| 177 | 0 | } |
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public final char readChar () throws java.io.IOException |
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{ |
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| 183 | 0 | if (++curBuf.curPos >= curBuf.dataLen) |
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{ |
| 185 | 0 | if (backupChars > 0) |
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{ |
| 187 | 0 | --curBuf.curPos; |
| 188 | 0 | swapBuf(); |
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} |
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else |
| 191 | 0 | FillBuff(); |
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} |
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; |
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| 195 | 0 | char c = (char) ((char) 0xff & curBuf.buffer[curBuf.curPos]); |
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| 198 | 0 | if (backupChars > 0) |
| 199 | 0 | --backupChars; |
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else |
| 201 | 0 | UpdateLineColumn(c); |
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| 203 | 0 | return (c); |
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} |
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public final int getColumn () |
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{ |
| 213 | 0 | return curBuf.bufcolumn[curBuf.curPos]; |
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} |
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public final int getLine () |
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{ |
| 223 | 0 | return curBuf.bufline[curBuf.curPos]; |
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} |
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public final int getEndColumn () |
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{ |
| 228 | 0 | return curBuf.bufcolumn[curBuf.curPos]; |
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} |
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public final int getEndLine () |
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{ |
| 233 | 0 | return curBuf.bufline[curBuf.curPos]; |
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} |
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public final int getBeginColumn () |
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{ |
| 238 | 0 | return tokenBeginBuf.bufcolumn[tokenBeginPos]; |
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} |
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public final int getBeginLine () |
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{ |
| 243 | 0 | return tokenBeginBuf.bufline[tokenBeginPos]; |
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} |
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public final void backup (int amount) |
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{ |
| 248 | 0 | backupChars += amount; |
| 249 | 0 | if (curBuf.curPos - amount < 0) |
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{ |
| 251 | 0 | int addlChars = amount - 1 - curBuf.curPos; |
| 252 | 0 | curBuf.curPos = 0; |
| 253 | 0 | swapBuf(); |
| 254 | 0 | curBuf.curPos = curBuf.dataLen - addlChars - 1; |
| 255 | 0 | } |
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else |
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{ |
| 258 | 0 | curBuf.curPos -= amount; |
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} |
| 260 | 0 | } |
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public ASCII_CharStream (java.io.Reader dstream, int startline, |
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int startcolumn, int buffersize) |
| 264 | 0 | { |
| 265 | 0 | ReInit(dstream, startline, startcolumn, buffersize); |
| 266 | 0 | } |
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public ASCII_CharStream (java.io.Reader dstream, int startline, |
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int startcolumn) |
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{ |
| 271 | 0 | this(dstream, startline, startcolumn, 4096); |
| 272 | 0 | } |
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public void ReInit (java.io.Reader dstream, int startline, |
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int startcolumn, int buffersize) |
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{ |
| 277 | 0 | inputStream = dstream; |
| 278 | 0 | line = startline; |
| 279 | 0 | column = startcolumn - 1; |
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|
| 281 | 0 | if (bufA == null || bufA.size != buffersize) |
| 282 | 0 | bufA = new Buffer(buffersize); |
| 283 | 0 | if (bufB == null || bufB.size != buffersize) |
| 284 | 0 | bufB = new Buffer(buffersize); |
| 285 | 0 | curBuf = bufA; |
| 286 | 0 | otherBuf = bufB; |
| 287 | 0 | curBuf.curPos = otherBuf.dataLen = -1; |
| 288 | 0 | curBuf.dataLen = otherBuf.dataLen = 0; |
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|
| 290 | 0 | prevCharIsLF = prevCharIsCR = false; |
| 291 | 0 | tokenBeginPos = -1; |
| 292 | 0 | tokenBeginBuf = null; |
| 293 | 0 | backupChars = 0; |
| 294 | 0 | } |
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public void ReInit (java.io.Reader dstream, int startline, |
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int startcolumn) |
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{ |
| 299 | 0 | ReInit(dstream, startline, startcolumn, 4096); |
| 300 | 0 | } |
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public ASCII_CharStream (java.io.InputStream dstream, int startline, |
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int startcolumn, int buffersize) |
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{ |
| 305 | 0 | this(new java.io.InputStreamReader(dstream), startline, startcolumn, 4096); |
| 306 | 0 | } |
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public ASCII_CharStream (java.io.InputStream dstream, int startline, |
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int startcolumn) |
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{ |
| 311 | 0 | this(dstream, startline, startcolumn, 4096); |
| 312 | 0 | } |
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public void ReInit (java.io.InputStream dstream, int startline, |
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int startcolumn, int buffersize) |
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{ |
| 317 | 0 | ReInit(new java.io.InputStreamReader(dstream), startline, startcolumn, |
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4096); |
| 319 | 0 | } |
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public void ReInit (java.io.InputStream dstream, int startline, |
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int startcolumn) |
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{ |
| 324 | 0 | ReInit(dstream, startline, startcolumn, 4096); |
| 325 | 0 | } |
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public final String GetImage () |
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{ |
| 329 | 0 | if (tokenBeginBuf == curBuf) |
| 330 | 0 | return new String(curBuf.buffer, tokenBeginPos, |
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curBuf.curPos - tokenBeginPos + 1); |
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else |
| 333 | 0 | return new String(otherBuf.buffer, tokenBeginPos, |
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otherBuf.dataLen - tokenBeginPos) |
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+ new String(curBuf.buffer, 0, curBuf.curPos + 1); |
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} |
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public final char[] GetSuffix (int len) |
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{ |
| 340 | 0 | char[] ret = new char[len]; |
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|
| 342 | 0 | if ((curBuf.curPos + 1) >= len) |
| 343 | 0 | System.arraycopy(curBuf.buffer, curBuf.curPos - len + 1, ret, 0, len); |
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else |
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{ |
| 346 | 0 | if (otherBuf.dataLen >= len - curBuf.curPos - 1) |
| 347 | 0 | System.arraycopy(otherBuf.buffer, |
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otherBuf.dataLen - (len - curBuf.curPos - 1), ret, 0, |
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len - curBuf.curPos - 1); |
| 350 | 0 | System.arraycopy(curBuf.buffer, 0, ret, len - curBuf.curPos - 1, |
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curBuf.curPos + 1); |
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} |
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| 354 | 0 | return null; |
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} |
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public void Done () |
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{ |
| 359 | 0 | bufA = bufB = curBuf = otherBuf = null; |
| 360 | 0 | } |
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} |
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