SimpleCharStream.java
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* Generated By:JavaCC: Do not edit this line. SimpleCharStream.java Version 3.0 */
package org.apache.commons.jxpath.ri.parser;
/**
* An implementation of interface CharStream, where the stream is assumed to contain only ASCII characters (without unicode processing).
*/
public class SimpleCharStream {
public static final boolean staticFlag = false;
int bufsize;
int available;
int tokenBegin;
public int bufpos = -1;
protected int bufline[];
protected int bufcolumn[];
protected int column = 0;
protected int line = 1;
protected boolean prevCharIsCR = false;
protected boolean prevCharIsLF = false;
protected java.io.Reader inputStream;
protected char[] buffer;
protected int maxNextCharInd = 0;
protected int inBuf = 0;
public SimpleCharStream(final java.io.InputStream dstream) {
this(dstream, 1, 1, 4096);
}
public SimpleCharStream(final java.io.InputStream dstream, final int startLine, final int startColumn) {
this(dstream, startLine, startColumn, 4096);
}
public SimpleCharStream(final java.io.InputStream dstream, final int startLine, final int startColumn, final int buffersize) {
this(new java.io.InputStreamReader(dstream), startLine, startColumn, 4096);
}
public SimpleCharStream(final java.io.Reader dstream) {
this(dstream, 1, 1, 4096);
}
public SimpleCharStream(final java.io.Reader dstream, final int startLine, final int startColumn) {
this(dstream, startLine, startColumn, 4096);
}
public SimpleCharStream(final java.io.Reader dstream, final int startLine, final int startColumn, final int bufferSize) {
inputStream = dstream;
line = startLine;
column = startColumn - 1;
available = bufsize = bufferSize;
buffer = new char[bufferSize];
bufline = new int[bufferSize];
bufcolumn = new int[bufferSize];
}
/**
* Method to adjust line and column numbers for the start of a token.<BR>
*
* @param newLine TODO
* @param newCol TODO
*/
public void adjustBeginLineColumn(int newLine, final int newCol) {
int start = tokenBegin;
int len;
if (bufpos >= tokenBegin) {
len = bufpos - tokenBegin + inBuf + 1;
} else {
len = bufsize - tokenBegin + bufpos + 1 + inBuf;
}
int i = 0, j = 0, k = 0;
int nextColDiff = 0, columnDiff = 0;
while (i < len && bufline[j = start % bufsize] == bufline[k = ++start % bufsize]) {
bufline[j] = newLine;
nextColDiff = columnDiff + bufcolumn[k] - bufcolumn[j];
bufcolumn[j] = newCol + columnDiff;
columnDiff = nextColDiff;
i++;
}
if (i < len) {
bufline[j] = newLine++;
bufcolumn[j] = newCol + columnDiff;
while (i++ < len) {
if (bufline[j = start % bufsize] != bufline[++start % bufsize]) {
bufline[j] = newLine++;
} else {
bufline[j] = newLine;
}
}
}
line = bufline[j];
column = bufcolumn[j];
}
public void backup(final int amount) {
inBuf += amount;
if ((bufpos -= amount) < 0) {
bufpos += bufsize;
}
}
public char BeginToken() throws java.io.IOException {
tokenBegin = -1;
final char c = readChar();
tokenBegin = bufpos;
return c;
}
public void Done() {
buffer = null;
bufline = null;
bufcolumn = null;
}
protected void ExpandBuff(final boolean wrapAround) {
final char[] newbuffer = new char[bufsize + 2048];
final int newbufline[] = new int[bufsize + 2048];
final int newbufcolumn[] = new int[bufsize + 2048];
try {
if (wrapAround) {
System.arraycopy(buffer, tokenBegin, newbuffer, 0, bufsize - tokenBegin);
System.arraycopy(buffer, 0, newbuffer, bufsize - tokenBegin, bufpos);
buffer = newbuffer;
System.arraycopy(bufline, tokenBegin, newbufline, 0, bufsize - tokenBegin);
System.arraycopy(bufline, 0, newbufline, bufsize - tokenBegin, bufpos);
bufline = newbufline;
System.arraycopy(bufcolumn, tokenBegin, newbufcolumn, 0, bufsize - tokenBegin);
System.arraycopy(bufcolumn, 0, newbufcolumn, bufsize - tokenBegin, bufpos);
bufcolumn = newbufcolumn;
maxNextCharInd = bufpos += bufsize - tokenBegin;
} else {
System.arraycopy(buffer, tokenBegin, newbuffer, 0, bufsize - tokenBegin);
buffer = newbuffer;
System.arraycopy(bufline, tokenBegin, newbufline, 0, bufsize - tokenBegin);
bufline = newbufline;
System.arraycopy(bufcolumn, tokenBegin, newbufcolumn, 0, bufsize - tokenBegin);
bufcolumn = newbufcolumn;
maxNextCharInd = bufpos -= tokenBegin;
}
} catch (final Throwable t) {
throw new Error(t.getMessage());
}
bufsize += 2048;
available = bufsize;
tokenBegin = 0;
}
protected void FillBuff() throws java.io.IOException {
if (maxNextCharInd == available) {
if (available == bufsize) {
if (tokenBegin > 2048) {
bufpos = maxNextCharInd = 0;
available = tokenBegin;
} else if (tokenBegin < 0) {
bufpos = maxNextCharInd = 0;
} else {
ExpandBuff(false);
}
} else if (available > tokenBegin) {
available = bufsize;
} else if (tokenBegin - available < 2048) {
ExpandBuff(true);
} else {
available = tokenBegin;
}
}
int i;
try {
if ((i = inputStream.read(buffer, maxNextCharInd, available - maxNextCharInd)) == -1) {
inputStream.close();
throw new java.io.IOException();
}
maxNextCharInd += i;
} catch (final java.io.IOException e) {
--bufpos;
backup(0);
if (tokenBegin == -1) {
tokenBegin = bufpos;
}
throw e;
}
}
public int getBeginColumn() {
return bufcolumn[tokenBegin];
}
public int getBeginLine() {
return bufline[tokenBegin];
}
/**
* @deprecated
* @return the end column.
* @see #getEndColumn
*/
@Deprecated
public int getColumn() {
return bufcolumn[bufpos];
}
public int getEndColumn() {
return bufcolumn[bufpos];
}
public int getEndLine() {
return bufline[bufpos];
}
public String GetImage() {
if (bufpos >= tokenBegin) {
return new String(buffer, tokenBegin, bufpos - tokenBegin + 1);
}
return new String(buffer, tokenBegin, bufsize - tokenBegin) + new String(buffer, 0, bufpos + 1);
}
/**
* @deprecated
* @return the line number.
* @see #getEndLine
*/
@Deprecated
public int getLine() {
return bufline[bufpos];
}
public char[] GetSuffix(final int len) {
final char[] ret = new char[len];
if (bufpos + 1 >= len) {
System.arraycopy(buffer, bufpos - len + 1, ret, 0, len);
} else {
System.arraycopy(buffer, bufsize - (len - bufpos - 1), ret, 0, len - bufpos - 1);
System.arraycopy(buffer, 0, ret, len - bufpos - 1, bufpos + 1);
}
return ret;
}
public char readChar() throws java.io.IOException {
if (inBuf > 0) {
--inBuf;
if (++bufpos == bufsize) {
bufpos = 0;
}
return buffer[bufpos];
}
if (++bufpos >= maxNextCharInd) {
FillBuff();
}
final char c = buffer[bufpos];
UpdateLineColumn(c);
return c;
}
public void ReInit(final java.io.InputStream dstream) {
ReInit(dstream, 1, 1, 4096);
}
public void ReInit(final java.io.InputStream dstream, final int startLine, final int startColumn) {
ReInit(dstream, startLine, startColumn, 4096);
}
public void ReInit(final java.io.InputStream dstream, final int startLine, final int startColumn, final int buffersize) {
ReInit(new java.io.InputStreamReader(dstream), startLine, startColumn, 4096);
}
public void ReInit(final java.io.Reader dstream) {
ReInit(dstream, 1, 1, 4096);
}
public void ReInit(final java.io.Reader dstream, final int startLine, final int startColumn) {
ReInit(dstream, startLine, startColumn, 4096);
}
public void ReInit(final java.io.Reader dstream, final int startLine, final int startColumn, final int bufferSize) {
inputStream = dstream;
line = startLine;
column = startColumn - 1;
if (buffer == null || bufferSize != buffer.length) {
available = bufsize = bufferSize;
buffer = new char[bufferSize];
bufline = new int[bufferSize];
bufcolumn = new int[bufferSize];
}
prevCharIsLF = prevCharIsCR = false;
tokenBegin = inBuf = maxNextCharInd = 0;
bufpos = -1;
}
protected void UpdateLineColumn(final char c) {
column++;
if (prevCharIsLF) {
prevCharIsLF = false;
line += column = 1;
} else if (prevCharIsCR) {
prevCharIsCR = false;
if (c == '\n') {
prevCharIsLF = true;
} else {
line += column = 1;
}
}
switch (c) {
case '\r':
prevCharIsCR = true;
break;
case '\n':
prevCharIsLF = true;
break;
case '\t':
column--;
column += 8 - (column & 07);
break;
default:
break;
}
bufline[bufpos] = line;
bufcolumn[bufpos] = column;
}
}