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org.apache.xerces.impl.xpath.SimpleCharStream Maven / Gradle / Ivy
/*
* 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
*
* http://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.
*/
package org.apache.xerces.impl.xpath;
/**
* An implementation of interface CharStream, where the stream is assumed to
* contain only ASCII characters (without unicode processing).
*
* (Parser generated using JavaCC)
*
* @author Hiranya Jayathilaka, University of Moratuwa
* @version $Id: SimpleCharStream.java 758138 2009-03-25 04:15:15Z mrglavas $
*/
public class SimpleCharStream {
/** Whether parser is static. */
public static final boolean staticFlag = false;
int bufsize;
int available;
int tokenBegin;
/** Position in buffer. */
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;
protected int tabSize = 8;
protected void setTabSize(int i) {
tabSize = i;
}
protected int getTabSize(int i) {
return tabSize;
}
protected void ExpandBuff(boolean wrapAround) {
char[] newbuffer = new char[bufsize + 2048];
int newbufline[] = new int[bufsize + 2048];
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 (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();
} else
maxNextCharInd += i;
return;
} catch (java.io.IOException e) {
--bufpos;
backup(0);
if (tokenBegin == -1)
tokenBegin = bufpos;
throw e;
}
}
/** Start. */
public char BeginToken() throws java.io.IOException {
tokenBegin = -1;
char c = readChar();
tokenBegin = bufpos;
return c;
}
protected void UpdateLineColumn(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 += (tabSize - (column % tabSize));
break;
default:
break;
}
bufline[bufpos] = line;
bufcolumn[bufpos] = column;
}
/** Read a character. */
public char readChar() throws java.io.IOException {
if (inBuf > 0) {
--inBuf;
if (++bufpos == bufsize)
bufpos = 0;
return buffer[bufpos];
}
if (++bufpos >= maxNextCharInd)
FillBuff();
char c = buffer[bufpos];
UpdateLineColumn(c);
return c;
}
/**
* @deprecated
* @see #getEndColumn
*/
public int getColumn() {
return bufcolumn[bufpos];
}
/**
* @deprecated
* @see #getEndLine
*/
public int getLine() {
return bufline[bufpos];
}
/** Get token end column number. */
public int getEndColumn() {
return bufcolumn[bufpos];
}
/** Get token end line number. */
public int getEndLine() {
return bufline[bufpos];
}
/** Get token beginning column number. */
public int getBeginColumn() {
return bufcolumn[tokenBegin];
}
/** Get token beginning line number. */
public int getBeginLine() {
return bufline[tokenBegin];
}
/** Backup a number of characters. */
public void backup(int amount) {
inBuf += amount;
if ((bufpos -= amount) < 0)
bufpos += bufsize;
}
/** Constructor. */
public SimpleCharStream(java.io.Reader dstream, int startline,
int startcolumn, int buffersize) {
inputStream = dstream;
line = startline;
column = startcolumn - 1;
available = bufsize = buffersize;
buffer = new char[buffersize];
bufline = new int[buffersize];
bufcolumn = new int[buffersize];
}
/** Constructor. */
public SimpleCharStream(java.io.Reader dstream, int startline,
int startcolumn) {
this(dstream, startline, startcolumn, 4096);
}
/** Constructor. */
public SimpleCharStream(java.io.Reader dstream) {
this(dstream, 1, 1, 4096);
}
/** Reinitialise. */
public void ReInit(java.io.Reader dstream, int startline, int startcolumn,
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;
}
/** Reinitialise. */
public void ReInit(java.io.Reader dstream, int startline, int startcolumn) {
ReInit(dstream, startline, startcolumn, 4096);
}
/** Reinitialise. */
public void ReInit(java.io.Reader dstream) {
ReInit(dstream, 1, 1, 4096);
}
/** Constructor. */
public SimpleCharStream(java.io.InputStream dstream, String encoding,
int startline, int startcolumn, int buffersize)
throws java.io.UnsupportedEncodingException {
this(encoding == null ? new java.io.InputStreamReader(dstream)
: new java.io.InputStreamReader(dstream, encoding), startline,
startcolumn, buffersize);
}
/** Constructor. */
public SimpleCharStream(java.io.InputStream dstream, int startline,
int startcolumn, int buffersize) {
this(new java.io.InputStreamReader(dstream), startline, startcolumn,
buffersize);
}
/** Constructor. */
public SimpleCharStream(java.io.InputStream dstream, String encoding,
int startline, int startcolumn)
throws java.io.UnsupportedEncodingException {
this(dstream, encoding, startline, startcolumn, 4096);
}
/** Constructor. */
public SimpleCharStream(java.io.InputStream dstream, int startline,
int startcolumn) {
this(dstream, startline, startcolumn, 4096);
}
/** Constructor. */
public SimpleCharStream(java.io.InputStream dstream, String encoding)
throws java.io.UnsupportedEncodingException {
this(dstream, encoding, 1, 1, 4096);
}
/** Constructor. */
public SimpleCharStream(java.io.InputStream dstream) {
this(dstream, 1, 1, 4096);
}
/** Reinitialise. */
public void ReInit(java.io.InputStream dstream, String encoding,
int startline, int startcolumn, int buffersize)
throws java.io.UnsupportedEncodingException {
ReInit(encoding == null ? new java.io.InputStreamReader(dstream)
: new java.io.InputStreamReader(dstream, encoding), startline,
startcolumn, buffersize);
}
/** Reinitialise. */
public void ReInit(java.io.InputStream dstream, int startline,
int startcolumn, int buffersize) {
ReInit(new java.io.InputStreamReader(dstream), startline, startcolumn,
buffersize);
}
/** Reinitialise. */
public void ReInit(java.io.InputStream dstream, String encoding)
throws java.io.UnsupportedEncodingException {
ReInit(dstream, encoding, 1, 1, 4096);
}
/** Reinitialise. */
public void ReInit(java.io.InputStream dstream) {
ReInit(dstream, 1, 1, 4096);
}
/** Reinitialise. */
public void ReInit(java.io.InputStream dstream, String encoding,
int startline, int startcolumn)
throws java.io.UnsupportedEncodingException {
ReInit(dstream, encoding, startline, startcolumn, 4096);
}
/** Reinitialise. */
public void ReInit(java.io.InputStream dstream, int startline,
int startcolumn) {
ReInit(dstream, startline, startcolumn, 4096);
}
/** Get token literal value. */
public String GetImage() {
if (bufpos >= tokenBegin)
return new String(buffer, tokenBegin, bufpos - tokenBegin + 1);
else
return new String(buffer, tokenBegin, bufsize - tokenBegin)
+ new String(buffer, 0, bufpos + 1);
}
/** Get the suffix. */
public char[] GetSuffix(int len) {
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;
}
/** Reset buffer when finished. */
public void Done() {
buffer = null;
bufline = null;
bufcolumn = null;
}
/**
* Method to adjust line and column numbers for the start of a token.
*/
public void adjustBeginLineColumn(int newLine, 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];
}
}
