svn-gvsig-desktop / trunk / libraries / libGDBMS / src / com / hardcode / gdbms / parser / SimpleCharStream.java @ 466
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package com.hardcode.gdbms.parser; |
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/* Generated By:JavaCC: Do not edit this line. SimpleCharStream.java Version 3.0 */
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/**
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* An implementation of interface CharStream, where the stream is assumed to
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* contain only ASCII characters (without unicode processing).
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*/
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public 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;
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public int bufpos = -1; |
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protected int bufline[]; |
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protected int bufcolumn[]; |
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protected int column = 0; |
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protected int line = 1; |
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protected boolean prevCharIsCR = false; |
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protected boolean prevCharIsLF = false; |
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protected java.io.Reader inputStream;
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protected char[] buffer; |
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protected int maxNextCharInd = 0; |
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protected int inBuf = 0; |
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protected void ExpandBuff(boolean wrapAround) |
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{ |
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char[] newbuffer = new char[bufsize + 2048]; |
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int newbufline[] = new int[bufsize + 2048]; |
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int newbufcolumn[] = new int[bufsize + 2048]; |
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try
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{ |
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if (wrapAround)
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{ |
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System.arraycopy(buffer, tokenBegin, newbuffer, 0, bufsize - tokenBegin); |
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System.arraycopy(buffer, 0, newbuffer, |
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bufsize - tokenBegin, bufpos); |
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buffer = newbuffer; |
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System.arraycopy(bufline, tokenBegin, newbufline, 0, bufsize - tokenBegin); |
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System.arraycopy(bufline, 0, newbufline, bufsize - tokenBegin, bufpos); |
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bufline = newbufline; |
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System.arraycopy(bufcolumn, tokenBegin, newbufcolumn, 0, bufsize - tokenBegin); |
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System.arraycopy(bufcolumn, 0, newbufcolumn, bufsize - tokenBegin, bufpos); |
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bufcolumn = newbufcolumn; |
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maxNextCharInd = (bufpos += (bufsize - tokenBegin)); |
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} |
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else
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{ |
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System.arraycopy(buffer, tokenBegin, newbuffer, 0, bufsize - tokenBegin); |
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buffer = newbuffer; |
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System.arraycopy(bufline, tokenBegin, newbufline, 0, bufsize - tokenBegin); |
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bufline = newbufline; |
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System.arraycopy(bufcolumn, tokenBegin, newbufcolumn, 0, bufsize - tokenBegin); |
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bufcolumn = newbufcolumn; |
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maxNextCharInd = (bufpos -= tokenBegin); |
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} |
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} |
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catch (Throwable t) |
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{ |
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throw new Error(t.getMessage()); |
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} |
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bufsize += 2048;
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available = bufsize; |
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tokenBegin = 0;
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} |
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protected void FillBuff() throws java.io.IOException |
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{ |
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if (maxNextCharInd == available)
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{ |
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if (available == bufsize)
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{ |
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if (tokenBegin > 2048) |
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{ |
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bufpos = maxNextCharInd = 0;
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available = tokenBegin; |
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} |
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else if (tokenBegin < 0) |
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bufpos = maxNextCharInd = 0;
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else
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ExpandBuff(false);
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} |
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else if (available > tokenBegin) |
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available = bufsize; |
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else if ((tokenBegin - available) < 2048) |
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ExpandBuff(true);
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else
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available = tokenBegin; |
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} |
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int i;
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try {
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if ((i = inputStream.read(buffer, maxNextCharInd,
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available - maxNextCharInd)) == -1)
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{ |
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inputStream.close(); |
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throw new java.io.IOException(); |
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} |
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else
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maxNextCharInd += i; |
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return;
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} |
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catch(java.io.IOException e) {
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--bufpos; |
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backup(0);
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if (tokenBegin == -1) |
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tokenBegin = bufpos; |
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throw e;
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} |
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} |
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public char BeginToken() throws java.io.IOException |
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{ |
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tokenBegin = -1;
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char c = readChar();
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tokenBegin = bufpos; |
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return c;
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} |
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protected void UpdateLineColumn(char c) |
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{ |
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column++; |
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if (prevCharIsLF)
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{ |
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prevCharIsLF = false;
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line += (column = 1);
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} |
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else if (prevCharIsCR) |
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{ |
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prevCharIsCR = false;
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if (c == '\n') |
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{ |
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prevCharIsLF = true;
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} |
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else
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line += (column = 1);
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} |
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switch (c)
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{ |
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case '\r' : |
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prevCharIsCR = true;
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break;
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case '\n' : |
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prevCharIsLF = true;
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break;
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case '\t' : |
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column--; |
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column += (8 - (column & 07)); |
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break;
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default :
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break;
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} |
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bufline[bufpos] = line; |
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bufcolumn[bufpos] = column; |
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} |
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public char readChar() throws java.io.IOException |
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{ |
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if (inBuf > 0) |
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{ |
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--inBuf; |
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if (++bufpos == bufsize)
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bufpos = 0;
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return buffer[bufpos];
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} |
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if (++bufpos >= maxNextCharInd)
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FillBuff(); |
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char c = buffer[bufpos];
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UpdateLineColumn(c); |
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return (c);
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} |
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/**
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* @deprecated
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* @see #getEndColumn
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*/
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public int getColumn() { |
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return bufcolumn[bufpos];
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} |
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/**
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* @deprecated
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* @see #getEndLine
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*/
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public int getLine() { |
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return bufline[bufpos];
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} |
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public int getEndColumn() { |
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return bufcolumn[bufpos];
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} |
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public int getEndLine() { |
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return bufline[bufpos];
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} |
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public int getBeginColumn() { |
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return bufcolumn[tokenBegin];
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} |
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public int getBeginLine() { |
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return bufline[tokenBegin];
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} |
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public void backup(int amount) { |
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inBuf += amount; |
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if ((bufpos -= amount) < 0) |
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bufpos += bufsize; |
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} |
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public SimpleCharStream(java.io.Reader dstream, int startline, |
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int startcolumn, int buffersize) |
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{ |
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inputStream = dstream; |
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line = startline; |
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column = startcolumn - 1;
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available = bufsize = buffersize; |
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buffer = new char[buffersize]; |
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bufline = new int[buffersize]; |
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bufcolumn = new int[buffersize]; |
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} |
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public SimpleCharStream(java.io.Reader dstream, int startline, |
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int startcolumn)
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{ |
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this(dstream, startline, startcolumn, 4096); |
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} |
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public SimpleCharStream(java.io.Reader dstream)
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{ |
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this(dstream, 1, 1, 4096); |
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} |
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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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{ |
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inputStream = dstream; |
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line = startline; |
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column = startcolumn - 1;
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if (buffer == null || buffersize != buffer.length) |
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{ |
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available = bufsize = buffersize; |
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buffer = new char[buffersize]; |
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bufline = new int[buffersize]; |
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bufcolumn = new int[buffersize]; |
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} |
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prevCharIsLF = prevCharIsCR = false;
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tokenBegin = inBuf = maxNextCharInd = 0;
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bufpos = -1;
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} |
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public void ReInit(java.io.Reader dstream, int startline, |
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int startcolumn)
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{ |
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ReInit(dstream, startline, startcolumn, 4096);
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} |
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public void ReInit(java.io.Reader dstream) |
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{ |
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ReInit(dstream, 1, 1, 4096); |
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} |
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public SimpleCharStream(java.io.InputStream dstream, int startline, |
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int startcolumn, int buffersize) |
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{ |
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this(new java.io.InputStreamReader(dstream), startline, startcolumn, 4096); |
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} |
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public SimpleCharStream(java.io.InputStream dstream, int startline, |
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int startcolumn)
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{ |
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this(dstream, startline, startcolumn, 4096); |
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} |
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public SimpleCharStream(java.io.InputStream dstream)
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{ |
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this(dstream, 1, 1, 4096); |
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} |
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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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{ |
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ReInit(new java.io.InputStreamReader(dstream), startline, startcolumn, 4096); |
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} |
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public void ReInit(java.io.InputStream dstream) |
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{ |
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ReInit(dstream, 1, 1, 4096); |
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} |
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public void ReInit(java.io.InputStream dstream, int startline, |
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int startcolumn)
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{ |
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ReInit(dstream, startline, startcolumn, 4096);
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} |
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public String GetImage() |
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{ |
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if (bufpos >= tokenBegin)
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return new String(buffer, tokenBegin, bufpos - tokenBegin + 1); |
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else
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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 char[] GetSuffix(int len) |
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{ |
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char[] ret = new char[len]; |
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if ((bufpos + 1) >= len) |
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System.arraycopy(buffer, bufpos - len + 1, ret, 0, len); |
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else
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{ |
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System.arraycopy(buffer, bufsize - (len - bufpos - 1), ret, 0, |
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len - bufpos - 1);
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System.arraycopy(buffer, 0, ret, len - bufpos - 1, bufpos + 1); |
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} |
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return ret;
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} |
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public void Done() |
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{ |
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buffer = null;
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bufline = null;
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bufcolumn = null;
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} |
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/**
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* Method to adjust line and column numbers for the start of a token.
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*/
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public void adjustBeginLineColumn(int newLine, int newCol) |
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{ |
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int start = tokenBegin;
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int len;
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if (bufpos >= tokenBegin)
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{ |
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len = bufpos - tokenBegin + inBuf + 1;
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} |
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else
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{ |
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len = bufsize - tokenBegin + bufpos + 1 + inBuf;
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} |
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int i = 0, j = 0, k = 0; |
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int nextColDiff = 0, columnDiff = 0; |
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while (i < len &&
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bufline[j = start % bufsize] == bufline[k = ++start % bufsize]) |
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{ |
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bufline[j] = newLine; |
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nextColDiff = columnDiff + bufcolumn[k] - bufcolumn[j]; |
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bufcolumn[j] = newCol + columnDiff; |
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columnDiff = nextColDiff; |
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i++; |
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} |
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if (i < len)
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{ |
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bufline[j] = newLine++; |
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bufcolumn[j] = newCol + columnDiff; |
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while (i++ < len)
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{ |
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if (bufline[j = start % bufsize] != bufline[++start % bufsize])
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bufline[j] = newLine++; |
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else
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bufline[j] = newLine; |
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} |
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} |
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line = bufline[j]; |
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column = bufcolumn[j]; |
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} |
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} |