soot.util.EscapedWriter Maven / Gradle / Ivy
package soot.util;
/*-
* #%L
* Soot - a J*va Optimization Framework
* %%
* Copyright (C) 1997 - 1999 Raja Vallee-Rai
* %%
* This program 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 program 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 General Lesser Public License for more details.
*
* You should have received a copy of the GNU General Lesser Public
* License along with this program. If not, see
* .
* #L%
*/
import java.io.FilterWriter;
import java.io.IOException;
import java.io.Writer;
/**
* A FilterWriter which catches to-be-escaped characters (\\unnnn
) 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));
}
}
}