/*******************************************************************************
* Copyright (c) 2006 Sybase, Inc. and others.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Sybase, Inc. - initial API and implementation
*******************************************************************************/
package org.eclipse.jst.jsf.common.ui.internal.utils;
/**
* TODO: this class doesn't seem to be in use
* @author mengbo
* @version 1.5
*/
public final class UTF8Util {
private static final char[] HEX_DIGITS = { '0', '1', '2', '3', '4', '5',
'6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
/**
* @param s
* @return the unwound string
*/
public static String unwindEscapeChars(String s) {
StringBuffer sb = new StringBuffer(s.length());
int length = s.length();
for (int i = 0; i < length; i++) {
char c = s.charAt(i);
sb.append(getUnwoundString(c));
}
return sb.toString();
}
private static String getUnwoundString(char c) {
switch (c) {
case '\b':
return "\\b";//$NON-NLS-1$
case '\t':
return "\\t";//$NON-NLS-1$
case '\n':
return "\\n";//$NON-NLS-1$
case '\f':
return "\\f";//$NON-NLS-1$
case '\r':
return "\\r";//$NON-NLS-1$
// These can be used unescaped in properties file:
case '\"':
return "\\\"";//$NON-NLS-1$
case '\'':
return "\\\'";//$NON-NLS-1$
case '\\':
return "\\\\";//$NON-NLS-1$
case '=':
return "\\=";//$NON-NLS-1$
// This is only done when writing to the .properties file in
// #unwindValue(String)
// case '!':
// return "\\!";//$NON-NLS-1$
// case '#':
// return "\\#";//$NON-NLS-1$
default:
if (((c < 0x0020) || (c > 0x007e))) {
return new StringBuffer().append('\\').append('u').append(
toHex((c >> 12) & 0xF)).append(toHex((c >> 8) & 0xF))
.append(toHex((c >> 4) & 0xF)).append(toHex(c & 0xF))
.toString();
}
return String.valueOf(c);
}
}
private static char toHex(int halfByte) {
return HEX_DIGITS[(halfByte & 0xF)];
}
private UTF8Util()
{
// no instantiation
}
}