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Java > Open Source Codes > org > aspectj > util > UnicodeEscapeWriter


1 /* -*- Mode: Java; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
2  *
3  * This file is part of the compiler and core tools for the AspectJ(tm)
4  * programming language; see http://aspectj.org
5  *
6  * The contents of this file are subject to the Mozilla Public License
7  * Version 1.1 (the "License"); you may not use this file except in
8  * compliance with the License. You may obtain a copy of the License at
9  * either http://www.mozilla.org/MPL/ or http://aspectj.org/MPL/.
10  *
11  * Software distributed under the License is distributed on an "AS IS" basis,
12  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
13  * for the specific language governing rights and limitations under the
14  * License.
15  *
16  * The Original Code is AspectJ.
17  *
18  * The Initial Developer of the Original Code is Xerox Corporation. Portions
19  * created by Xerox Corporation are Copyright (C) 1999-2002 Xerox Corporation.
20  * All Rights Reserved.
21  *
22  * Contributor(s):
23  */
24
25 package org.aspectj.util;
26
27 import java.io.*;
28
29 public class UnicodeEscapeWriter extends Writer {
30     protected OutputStream outputStream;
31     protected byte[] buffer;
32     protected static final int bufferSize = 2048;
33     protected int index;
34     protected boolean addSlash;
35
36     public UnicodeEscapeWriter(OutputStream outputStream) {
37         this.outputStream = outputStream;
38         // the extra 16 lets us avoid thinking about overflow issues too often
39 buffer = new byte[bufferSize+16];
40         index = 0;
41         addSlash = false;
42     }
43
44     public void write(int ch) throws IOException {
45         if (addSlash && ch == 'u') {
46             buffer[index++] = (byte)'\\';
47             //buffer[index++] = 'u';
48 }
49
50         if (ch == '\\') {
51             addSlash = !addSlash;
52         } else {
53             addSlash = false;
54         }
55
56         if (ch < 1 || ch > 126) {
57             int b1 = ch>>12;
58             int b2 = ch>>8 & 0xf;
59             int b3 = ch>>4 & 0xf;
60             int b4 = ch & 0xf;
61
62             buffer[index++] = (byte)'\\';
63             buffer[index++] = (byte)'u';
64             buffer[index++] = (byte)Character.forDigit(b1, 16);
65             buffer[index++] = (byte)Character.forDigit(b2, 16);
66             buffer[index++] = (byte)Character.forDigit(b3, 16);
67             buffer[index++] = (byte)Character.forDigit(b4, 16);
68         } else {
69             buffer[index++] = (byte)ch;
70         }
71
72         if (index >= bufferSize) flushBuffer();
73     }
74
75     public void flushBuffer() throws IOException {
76         outputStream.write(buffer, 0, index);
77         index = 0;
78     }
79
80     public void write(char[] cbuf, int off, int len) throws IOException {
81         int index=0;
82         while (index<len) {
83             write(cbuf[off+index++]);
84         }
85     }
86
87     public void close() throws IOException {
88         flushBuffer();
89         outputStream.close();
90     }
91
92     public void flush() throws IOException {
93         flushBuffer();
94         outputStream.flush();
95     }
96
97     // \\uxxxx
98
99
100     public static void main(String JavaDoc[] args) throws IOException {
101         UnicodeEscapeWriter writer = new UnicodeEscapeWriter(System.out);
102         writer.write("x = '\u0000'; y = '\u0032\u0033\u1234\uabcd'\n");
103         writer.write("\\"+"u"+"xxxx");
104         writer.flush();
105     }
106 }
107
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