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package org.apache.commons.el.parser; |
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public final class SimpleCharStream |
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{ |
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public static final boolean staticFlag = false; |
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int bufsize; |
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int available; |
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int tokenBegin; |
15 | 8 | public int bufpos = -1; |
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private int bufline[]; |
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private int bufcolumn[]; |
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|
19 | 8 | private int column = 0; |
20 | 8 | private int line = 1; |
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|
22 | 8 | private boolean prevCharIsCR = false; |
23 | 8 | private boolean prevCharIsLF = false; |
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private java.io.Reader inputStream; |
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private char[] buffer; |
28 | 8 | private int maxNextCharInd = 0; |
29 | 8 | private int inBuf = 0; |
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private final void ExpandBuff(boolean wrapAround) |
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{ |
33 | 0 | char[] newbuffer = new char[bufsize + 2048]; |
34 | 0 | int newbufline[] = new int[bufsize + 2048]; |
35 | 0 | int newbufcolumn[] = new int[bufsize + 2048]; |
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|
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try |
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{ |
39 | 0 | if (wrapAround) |
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{ |
41 | 0 | System.arraycopy(buffer, tokenBegin, newbuffer, 0, bufsize - tokenBegin); |
42 | 0 | System.arraycopy(buffer, 0, newbuffer, |
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bufsize - tokenBegin, bufpos); |
44 | 0 | buffer = newbuffer; |
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|
46 | 0 | System.arraycopy(bufline, tokenBegin, newbufline, 0, bufsize - tokenBegin); |
47 | 0 | System.arraycopy(bufline, 0, newbufline, bufsize - tokenBegin, bufpos); |
48 | 0 | bufline = newbufline; |
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|
50 | 0 | System.arraycopy(bufcolumn, tokenBegin, newbufcolumn, 0, bufsize - tokenBegin); |
51 | 0 | System.arraycopy(bufcolumn, 0, newbufcolumn, bufsize - tokenBegin, bufpos); |
52 | 0 | bufcolumn = newbufcolumn; |
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|
54 | 0 | maxNextCharInd = (bufpos += (bufsize - tokenBegin)); |
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} |
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else |
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{ |
58 | 0 | System.arraycopy(buffer, tokenBegin, newbuffer, 0, bufsize - tokenBegin); |
59 | 0 | buffer = newbuffer; |
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|
61 | 0 | System.arraycopy(bufline, tokenBegin, newbufline, 0, bufsize - tokenBegin); |
62 | 0 | bufline = newbufline; |
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|
64 | 0 | System.arraycopy(bufcolumn, tokenBegin, newbufcolumn, 0, bufsize - tokenBegin); |
65 | 0 | bufcolumn = newbufcolumn; |
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|
67 | 0 | maxNextCharInd = (bufpos -= tokenBegin); |
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} |
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} |
70 | 0 | catch (Throwable t) |
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{ |
72 | 0 | throw new Error(t.getMessage()); |
73 | 0 | } |
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|
76 | 0 | bufsize += 2048; |
77 | 0 | available = bufsize; |
78 | 0 | tokenBegin = 0; |
79 | 0 | } |
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private final void FillBuff() throws java.io.IOException |
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{ |
83 | 16 | if (maxNextCharInd == available) |
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{ |
85 | 0 | if (available == bufsize) |
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{ |
87 | 0 | if (tokenBegin > 2048) |
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{ |
89 | 0 | bufpos = maxNextCharInd = 0; |
90 | 0 | available = tokenBegin; |
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} |
92 | 0 | else if (tokenBegin < 0) |
93 | 0 | bufpos = maxNextCharInd = 0; |
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else |
95 | 0 | ExpandBuff(false); |
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} |
97 | 0 | else if (available > tokenBegin) |
98 | 0 | available = bufsize; |
99 | 0 | else if ((tokenBegin - available) < 2048) |
100 | 0 | ExpandBuff(true); |
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else |
102 | 0 | available = tokenBegin; |
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} |
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int i; |
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try { |
107 | 16 | if ((i = inputStream.read(buffer, maxNextCharInd, |
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available - maxNextCharInd)) == -1) |
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{ |
110 | 8 | inputStream.close(); |
111 | 8 | throw new java.io.IOException(); |
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} |
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else |
114 | 8 | maxNextCharInd += i; |
115 | 8 | return; |
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} |
117 | 8 | catch(java.io.IOException e) { |
118 | 8 | --bufpos; |
119 | 8 | backup(0); |
120 | 8 | if (tokenBegin == -1) |
121 | 8 | tokenBegin = bufpos; |
122 | 8 | 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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{ |
128 | 47 | tokenBegin = -1; |
129 | 47 | char c = readChar(); |
130 | 39 | tokenBegin = bufpos; |
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|
132 | 39 | return c; |
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} |
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private final void UpdateLineColumn(char c) |
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{ |
137 | 86 | column++; |
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|
139 | 86 | if (prevCharIsLF) |
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{ |
141 | 0 | prevCharIsLF = false; |
142 | 0 | line += (column = 1); |
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} |
144 | 86 | else if (prevCharIsCR) |
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{ |
146 | 0 | prevCharIsCR = false; |
147 | 0 | if (c == '\n') |
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{ |
149 | 0 | prevCharIsLF = true; |
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} |
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else |
152 | 0 | line += (column = 1); |
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} |
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|
155 | 86 | switch (c) |
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{ |
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case '\r' : |
158 | 0 | prevCharIsCR = true; |
159 | 0 | break; |
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case '\n' : |
161 | 0 | prevCharIsLF = true; |
162 | 0 | break; |
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case '\t' : |
164 | 0 | column--; |
165 | 0 | column += (8 - (column & 07)); |
166 | 0 | break; |
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default : |
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break; |
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} |
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|
171 | 86 | bufline[bufpos] = line; |
172 | 86 | bufcolumn[bufpos] = column; |
173 | 86 | } |
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public final char readChar() throws java.io.IOException |
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{ |
177 | 102 | if (inBuf > 0) |
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{ |
179 | 8 | --inBuf; |
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|
181 | 8 | if (++bufpos == bufsize) |
182 | 0 | bufpos = 0; |
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|
184 | 8 | return buffer[bufpos]; |
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} |
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|
187 | 94 | if (++bufpos >= maxNextCharInd) |
188 | 16 | FillBuff(); |
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|
190 | 86 | char c = buffer[bufpos]; |
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|
192 | 86 | UpdateLineColumn(c); |
193 | 86 | return (c); |
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} |
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public final int getColumn() { |
202 | 0 | return bufcolumn[bufpos]; |
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} |
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public final int getLine() { |
211 | 0 | return bufline[bufpos]; |
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} |
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public final int getEndColumn() { |
215 | 43 | return bufcolumn[bufpos]; |
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} |
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public final int getEndLine() { |
219 | 43 | return bufline[bufpos]; |
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} |
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public final int getBeginColumn() { |
223 | 43 | return bufcolumn[tokenBegin]; |
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} |
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public final int getBeginLine() { |
227 | 43 | return bufline[tokenBegin]; |
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} |
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public final void backup(int amount) { |
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|
232 | 43 | inBuf += amount; |
233 | 43 | if ((bufpos -= amount) < 0) |
234 | 0 | bufpos += bufsize; |
235 | 43 | } |
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public SimpleCharStream(java.io.Reader dstream, int startline, |
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int startcolumn, int buffersize) |
239 | 8 | { |
240 | 8 | inputStream = dstream; |
241 | 8 | line = startline; |
242 | 8 | column = startcolumn - 1; |
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|
244 | 8 | available = bufsize = buffersize; |
245 | 8 | buffer = new char[buffersize]; |
246 | 8 | bufline = new int[buffersize]; |
247 | 8 | bufcolumn = new int[buffersize]; |
248 | 8 | } |
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public SimpleCharStream(java.io.Reader dstream, int startline, |
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int startcolumn) |
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{ |
253 | 8 | this(dstream, startline, startcolumn, 4096); |
254 | 8 | } |
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public SimpleCharStream(java.io.Reader dstream) |
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{ |
258 | 0 | this(dstream, 1, 1, 4096); |
259 | 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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{ |
263 | 0 | inputStream = dstream; |
264 | 0 | line = startline; |
265 | 0 | column = startcolumn - 1; |
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|
267 | 0 | if (buffer == null || buffersize != buffer.length) |
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{ |
269 | 0 | available = bufsize = buffersize; |
270 | 0 | buffer = new char[buffersize]; |
271 | 0 | bufline = new int[buffersize]; |
272 | 0 | bufcolumn = new int[buffersize]; |
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} |
274 | 0 | prevCharIsLF = prevCharIsCR = false; |
275 | 0 | tokenBegin = inBuf = maxNextCharInd = 0; |
276 | 0 | bufpos = -1; |
277 | 0 | } |
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public void ReInit(java.io.Reader dstream, int startline, |
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int startcolumn) |
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{ |
282 | 0 | ReInit(dstream, startline, startcolumn, 4096); |
283 | 0 | } |
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public void ReInit(java.io.Reader dstream) |
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{ |
287 | 0 | ReInit(dstream, 1, 1, 4096); |
288 | 0 | } |
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public SimpleCharStream(java.io.InputStream dstream, int startline, |
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int startcolumn, int buffersize) |
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{ |
292 | 0 | this(new java.io.InputStreamReader(dstream), startline, startcolumn, 4096); |
293 | 0 | } |
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public SimpleCharStream(java.io.InputStream dstream, int startline, |
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int startcolumn) |
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{ |
298 | 0 | this(dstream, startline, startcolumn, 4096); |
299 | 0 | } |
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public SimpleCharStream(java.io.InputStream dstream) |
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{ |
303 | 0 | this(dstream, 1, 1, 4096); |
304 | 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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{ |
309 | 0 | ReInit(new java.io.InputStreamReader(dstream), startline, startcolumn, 4096); |
310 | 0 | } |
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public void ReInit(java.io.InputStream dstream) |
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{ |
314 | 0 | ReInit(dstream, 1, 1, 4096); |
315 | 0 | } |
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public void ReInit(java.io.InputStream dstream, int startline, |
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int startcolumn) |
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{ |
319 | 0 | ReInit(dstream, startline, startcolumn, 4096); |
320 | 0 | } |
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public final String GetImage() |
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{ |
323 | 10 | if (bufpos >= tokenBegin) |
324 | 10 | return new String(buffer, tokenBegin, bufpos - tokenBegin + 1); |
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else |
326 | 0 | return new String(buffer, tokenBegin, bufsize - tokenBegin) + |
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new String(buffer, 0, bufpos + 1); |
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} |
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public final char[] GetSuffix(int len) |
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{ |
332 | 0 | char[] ret = new char[len]; |
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|
334 | 0 | if ((bufpos + 1) >= len) |
335 | 0 | System.arraycopy(buffer, bufpos - len + 1, ret, 0, len); |
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else |
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{ |
338 | 0 | System.arraycopy(buffer, bufsize - (len - bufpos - 1), ret, 0, |
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len - bufpos - 1); |
340 | 0 | System.arraycopy(buffer, 0, ret, len - bufpos - 1, bufpos + 1); |
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} |
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|
343 | 0 | return ret; |
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} |
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public void Done() |
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{ |
348 | 0 | buffer = null; |
349 | 0 | bufline = null; |
350 | 0 | bufcolumn = null; |
351 | 0 | } |
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public void adjustBeginLineColumn(int newLine, int newCol) |
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{ |
358 | 0 | int start = tokenBegin; |
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int len; |
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|
361 | 0 | if (bufpos >= tokenBegin) |
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{ |
363 | 0 | len = bufpos - tokenBegin + inBuf + 1; |
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} |
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else |
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{ |
367 | 0 | len = bufsize - tokenBegin + bufpos + 1 + inBuf; |
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} |
369 | |
|
370 | 0 | int i = 0, j = 0, k = 0; |
371 | 0 | int nextColDiff = 0, columnDiff = 0; |
372 | |
|
373 | 0 | while (i < len && |
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bufline[j = start % bufsize] == bufline[k = ++start % bufsize]) |
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{ |
376 | 0 | bufline[j] = newLine; |
377 | 0 | nextColDiff = columnDiff + bufcolumn[k] - bufcolumn[j]; |
378 | 0 | bufcolumn[j] = newCol + columnDiff; |
379 | 0 | columnDiff = nextColDiff; |
380 | 0 | i++; |
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} |
382 | |
|
383 | 0 | if (i < len) |
384 | |
{ |
385 | 0 | bufline[j] = newLine++; |
386 | 0 | bufcolumn[j] = newCol + columnDiff; |
387 | |
|
388 | 0 | while (i++ < len) |
389 | |
{ |
390 | 0 | if (bufline[j = start % bufsize] != bufline[++start % bufsize]) |
391 | 0 | bufline[j] = newLine++; |
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else |
393 | 0 | bufline[j] = newLine; |
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} |
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} |
396 | |
|
397 | 0 | line = bufline[j]; |
398 | 0 | column = bufcolumn[j]; |
399 | 0 | } |
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} |