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/*
* Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* - Redistribution of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistribution in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* Neither the name of Sun Microsystems, Inc. or the names of
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
* INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
* MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
* ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
* DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
* ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR
* DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
* DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
* ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
* SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
*
* You acknowledge that this software is not designed or intended for use
* in the design, construction, operation or maintenance of any nuclear
* facility.
*
* Sun gratefully acknowledges that this software was originally authored
* and developed by Kenneth Bradley Russell and Christopher John Kline.
*/
package com.sun.gluegen.pcpp;
import java.io.*;
/** A Reader implementation which finds lines ending in the backslash
character ('\') and concatenates them with the next line. */
public class ConcatenatingReader extends FilterReader {
// Any leftover characters go here
private char[] curBuf;
private int curPos;
private BufferedReader reader;
private static String newline = System.getProperty("line.separator");
/** This class requires that the input reader be a BufferedReader so
it can do line-oriented operations. */
public ConcatenatingReader(BufferedReader in) {
super(in);
this.reader = in;
}
@Override
public int read() throws IOException {
char[] tmp = new char[1];
int num = read(tmp, 0, 1);
if (num < 0)
return -1;
return tmp[0];
}
// It's easier not to support mark/reset since we don't need it
@Override
public boolean markSupported() {
return false;
}
@Override
public void mark(int readAheadLimit) throws IOException {
throw new IOException("mark/reset not supported");
}
@Override
public void reset() throws IOException {
throw new IOException("mark/reset not supported");
}
@Override
public boolean ready() throws IOException {
if (curBuf != null || reader.ready())
return true;
return false;
}
@Override
public int read(char[] cbuf, int off, int len) throws IOException {
if (curBuf == null) {
nextLine();
}
if (curBuf == null) {
return -1;
}
int numRead = 0;
while ((len > 0) && (curBuf != null) && (curPos < curBuf.length)) {
cbuf[off] = curBuf[curPos];
++curPos;
++off;
--len;
++numRead;
if (curPos == curBuf.length) {
nextLine();
}
}
return numRead;
}
@Override
public long skip(long n) throws IOException {
long numSkipped = 0;
while (n > 0) {
int intN = (int) n;
char[] tmp = new char[intN];
int numRead = read(tmp, 0, intN);
n -= numRead;
numSkipped += numRead;
if (numRead < intN)
break;
}
return numSkipped;
}
private void nextLine() throws IOException {
String cur = reader.readLine();
if (cur == null) {
curBuf = null;
return;
}
// The trailing newline was trimmed by the readLine() method. See
// whether we have to put it back or not, depending on whether the
// last character of the line is the concatenation character.
int numChars = cur.length();
boolean needNewline = true;
if ((numChars > 0) &&
(cur.charAt(cur.length() - 1) == '\\')) {
--numChars;
needNewline = false;
}
char[] buf = new char[numChars + (needNewline ? newline.length() : 0)];
cur.getChars(0, numChars, buf, 0);
if (needNewline) {
newline.getChars(0, newline.length(), buf, numChars);
}
curBuf = buf;
curPos = 0;
}
// Test harness
/*
public static void main(String[] args) throws IOException {
if (args.length != 1) {
System.out.println("Usage: java ConcatenatingReader [file name]");
System.exit(1);
}
ConcatenatingReader reader = new ConcatenatingReader(new BufferedReader(new FileReader(args[0])));
OutputStreamWriter writer = new OutputStreamWriter(System.out);
char[] buf = new char[8192];
boolean done = false;
while (!done && reader.ready()) {
int numRead = reader.read(buf, 0, buf.length);
writer.write(buf, 0, numRead);
if (numRead < buf.length)
done = true;
}
writer.flush();
}
*/
}
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