1/*
2 * Copyright 2012, Google Inc.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met:
8 *
9 *     * Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 *     * Redistributions in binary form must reproduce the above
12 * copyright notice, this list of conditions and the following disclaimer
13 * in the documentation and/or other materials provided with the
14 * distribution.
15 *     * Neither the name of Google Inc. nor the names of its
16 * contributors may be used to endorse or promote products derived from
17 * this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
23 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
25 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32package org.jf.util;
33
34import java.io.IOException;
35import java.io.Writer;
36
37public class StringUtils {
38    public static void writeEscapedChar(Writer writer, char c) throws IOException {
39        if ((c >= ' ') && (c < 0x7f)) {
40            if ((c == '\'') || (c == '\"') || (c == '\\')) {
41                writer.write('\\');
42            }
43            writer.write(c);
44            return;
45        } else if (c <= 0x7f) {
46            switch (c) {
47                case '\n': writer.write("\\n"); return;
48                case '\r': writer.write("\\r"); return;
49                case '\t': writer.write("\\t"); return;
50            }
51        }
52
53        writer.write("\\u");
54        writer.write(Character.forDigit(c >> 12, 16));
55        writer.write(Character.forDigit((c >> 8) & 0x0f, 16));
56        writer.write(Character.forDigit((c >> 4) & 0x0f, 16));
57        writer.write(Character.forDigit(c & 0x0f, 16));
58    }
59
60    public static void writeEscapedString(Writer writer, String value) throws IOException {
61        for (int i = 0; i < value.length(); i++) {
62            char c = value.charAt(i);
63
64            if ((c >= ' ') && (c < 0x7f)) {
65                if ((c == '\'') || (c == '\"') || (c == '\\')) {
66                    writer.write('\\');
67                }
68                writer.write(c);
69                continue;
70            } else if (c <= 0x7f) {
71                switch (c) {
72                    case '\n': writer.write("\\n"); continue;
73                    case '\r': writer.write("\\r"); continue;
74                    case '\t': writer.write("\\t"); continue;
75                }
76            }
77
78            writer.write("\\u");
79            writer.write(Character.forDigit(c >> 12, 16));
80            writer.write(Character.forDigit((c >> 8) & 0x0f, 16));
81            writer.write(Character.forDigit((c >> 4) & 0x0f, 16));
82            writer.write(Character.forDigit(c & 0x0f, 16));
83        }
84    }
85
86    public static String escapeString(String value) {
87        int len = value.length();
88        StringBuilder sb = new StringBuilder(len * 3 / 2);
89
90        for (int i = 0; i < len; i++) {
91            char c = value.charAt(i);
92
93            if ((c >= ' ') && (c < 0x7f)) {
94                if ((c == '\'') || (c == '\"') || (c == '\\')) {
95                    sb.append('\\');
96                }
97                sb.append(c);
98                continue;
99            } else if (c <= 0x7f) {
100                switch (c) {
101                    case '\n': sb.append("\\n"); continue;
102                    case '\r': sb.append("\\r"); continue;
103                    case '\t': sb.append("\\t"); continue;
104                }
105            }
106
107            sb.append("\\u");
108            sb.append(Character.forDigit(c >> 12, 16));
109            sb.append(Character.forDigit((c >> 8) & 0x0f, 16));
110            sb.append(Character.forDigit((c >> 4) & 0x0f, 16));
111            sb.append(Character.forDigit(c & 0x0f, 16));
112        }
113
114        return sb.toString();
115    }
116}
117