/* 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 FilterReader which catches escaped characters (<code>\\unnnn</code>) in the
* input and de-escapes them. Used in the Jimple Parser. */
public class EscapedReader extends FilterReader
{
/** Constructs an EscapedReader around the given Reader. */
public EscapedReader(Reader fos)
{
super(fos);
}
private StringBuffer mini = new StringBuffer();
boolean nextF;
int nextch = 0;
/** Reads a character from the input. */
public int read() throws IOException
{
/* if you already read the char, just return it */
if (nextF)
{
nextF = false;
return nextch;
}
int ch = super.read();
if (ch != '\\')
return ch;
/* we may have an escape sequence here ..*/
mini = new StringBuffer();
ch = super.read();
if (ch != 'u')
{
nextF = true; nextch = ch;
return '\\';
}
mini.append("\\u");
while (mini.length() < 6)
{
ch = super.read();
mini.append((char)ch);
}
// G.v().out.println(mini.toString());
ch = Integer.parseInt(mini.substring(2).toString(), 16);
return ch;
}
}