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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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