com.sun.codemodel.util.UnicodeEscapeWriter Maven / Gradle / Ivy
/*
* Copyright (c) 1997, 2022 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Distribution License v. 1.0, which is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
package com.sun.codemodel.util;
import java.io.FilterWriter;
import java.io.IOException;
import java.io.Writer;
/**
* {@link Writer} that escapes non US-ASCII characters into
* Java Unicode escape \\uXXXX.
*
* This process is necessary if the method names or field names
* contain non US-ASCII characters.
*
* @author
* Kohsuke Kawaguchi ([email protected])
*/
public class UnicodeEscapeWriter extends FilterWriter {
public UnicodeEscapeWriter( Writer next ) {
super(next);
}
@Override
public final void write(int ch) throws IOException {
if(!requireEscaping(ch)) out.write(ch);
else {
// need to escape
out.write("\\u");
String s = Integer.toHexString(ch);
for( int i=s.length(); i<4; i++ )
out.write('0');
out.write(s);
}
}
/**
* Can be overrided. Return true if the character
* needs to be escaped.
*/
protected boolean requireEscaping(int ch) {
if(ch>=128) return true;
// control characters
return ch < 0x20 && " \t\r\n".indexOf(ch) == -1;
}
@Override
public final void write(char[] buf, int off, int len) throws IOException {
for( int i=0; i