1 /* 2 * ProGuard -- shrinking, optimization, obfuscation, and preverification 3 * of Java bytecode. 4 * 5 * Copyright (c) 2002-2014 Eric Lafortune (eric (at) graphics.cornell.edu) 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms of the GNU General Public License as published by the Free 9 * Software Foundation; either version 2 of the License, or (at your option) 10 * any later version. 11 * 12 * This program is distributed in the hope that it will be useful, but WITHOUT 13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 15 * more details. 16 * 17 * You should have received a copy of the GNU General Public License along 18 * with this program; if not, write to the Free Software Foundation, Inc., 19 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 20 */ 21 package proguard.util; 22 23 import java.util.*; 24 25 26 /** 27 * This class provides some utility methods for working with 28 * <code>java.util.List</code> objects. 29 * 30 * @author Eric Lafortune 31 */ 32 public class ListUtil 33 { 34 /** 35 * Creates a comma-separated String from the given List of String objects. 36 */ 37 public static String commaSeparatedString(List list, boolean quoteStrings) 38 { 39 if (list == null) 40 { 41 return null; 42 } 43 44 StringBuffer buffer = new StringBuffer(); 45 46 for (int index = 0; index < list.size(); index++) 47 { 48 if (index > 0) 49 { 50 buffer.append(','); 51 } 52 53 String string = (String)list.get(index); 54 55 if (quoteStrings) 56 { 57 string = quotedString(string); 58 } 59 60 buffer.append(string); 61 } 62 63 return buffer.toString(); 64 } 65 66 67 /** 68 * Creates a List of String objects from the given comma-separated String. 69 */ 70 public static List commaSeparatedList(String string) 71 { 72 if (string == null) 73 { 74 return null; 75 } 76 77 List list = new ArrayList(); 78 int index = 0; 79 while ((index = skipWhitespace(string, index)) < string.length()) 80 { 81 int nextIndex; 82 83 // Do we have an opening quote? 84 if (string.charAt(index) == '\'') 85 { 86 // Parse a quoted string. 87 nextIndex = string.indexOf('\'', index + 1); 88 if (nextIndex < 0) 89 { 90 nextIndex = string.length(); 91 } 92 93 list.add(string.substring(index + 1, nextIndex)); 94 } 95 else 96 { 97 // Parse a non-quoted string. 98 nextIndex = string.indexOf(',', index); 99 if (nextIndex < 0) 100 { 101 nextIndex = string.length(); 102 } 103 104 String substring = string.substring(index, nextIndex).trim(); 105 if (substring.length() > 0) 106 { 107 list.add(substring); 108 } 109 } 110 111 index = nextIndex + 1; 112 } 113 114 return list; 115 } 116 117 118 /** 119 * Skips any whitespace characters. 120 */ 121 private static int skipWhitespace(String string, int index) 122 { 123 while (index < string.length() && 124 Character.isWhitespace(string.charAt(index))) 125 { 126 index++; 127 } 128 return index; 129 } 130 131 132 /** 133 * Returns a quoted version of the given string, if necessary. 134 */ 135 private static String quotedString(String string) 136 { 137 return string.length() == 0 || 138 string.indexOf(' ') >= 0 || 139 string.indexOf('@') >= 0 || 140 string.indexOf('{') >= 0 || 141 string.indexOf('}') >= 0 || 142 string.indexOf('(') >= 0 || 143 string.indexOf(')') >= 0 || 144 string.indexOf(':') >= 0 || 145 string.indexOf(';') >= 0 || 146 string.indexOf(',') >= 0 ? ("'" + string + "'") : 147 ( string ); 148 } 149 150 151 public static void main(String[] args) 152 { 153 if (args.length == 1) 154 { 155 System.out.println("Input string: ["+args[0]+"]"); 156 157 List list = commaSeparatedList(args[0]); 158 159 System.out.println("Resulting list:"); 160 for (int index = 0; index < list.size(); index++) 161 { 162 System.out.println("["+list.get(index)+"]"); 163 } 164 } 165 else 166 { 167 List list = Arrays.asList(args); 168 169 System.out.println("Input list:"); 170 for (int index = 0; index < list.size(); index++) 171 { 172 System.out.println("["+list.get(index)+"]"); 173 } 174 175 String string = commaSeparatedString(list, true); 176 177 System.out.println("Resulting string: ["+string+"]"); 178 } 179 } 180 } 181
