/* Soot - a J*va Optimization Framework
* Copyright (C) 1997-1999 Raja Vallee-Rai
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
* Modified by the Sable Research Group and others 1997-1999.
* See the 'credits' file distributed with Soot for the complete list of
* contributors. (Soot is distributed at http://www.sable.mcgill.ca/soot)
*/
package soot.util;
import java.io.*;
/** A FilterWriter which catches to-be-escaped characters (<code>\\unnnn</code>) in the
* input and substitutes their escaped representation. Used for Soot output. */
public class EscapedWriter extends FilterWriter
{
/** Convenience field containing the system's line separator. */
public final String lineSeparator = System.getProperty("line.separator");
private final int cr = lineSeparator.charAt(0);
private final int lf = (lineSeparator.length() == 2) ? lineSeparator.charAt(1) : -1;
/** Constructs an EscapedWriter around the given Writer. */
public EscapedWriter(Writer fos)
{
super(fos);
}
private final StringBuffer mini = new StringBuffer();
/** Print a single character (unsupported). */
public void print(int ch) throws IOException
{
write(ch);
throw new RuntimeException();
}
/** Write a segment of the given String. */
public void write(String s, int off, int len) throws IOException
{
for(int i = off; i < off + len; i++)
write(s.charAt(i));
}
/** Write a single character. */
public void write(int ch) throws IOException
{
if (ch >= 32 && ch <= 126 || ch == cr || ch == lf || ch == ' ')
{ super.write(ch); return; }
mini.setLength(0);
mini.append(Integer.toHexString(ch));
while (mini.length() < 4)
mini.insert(0, "0");
mini.insert(0, "\\u");
for (int i = 0; i < mini.length(); i++)
super.write(mini.charAt(i));
}
}