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 32 package org.jf.util; 33 34 import java.io.IOException; 35 import java.io.Writer; 36 37 public 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
