001 /*
002 * Copyright (c) 2005 Henri Sivonen
003 *
004 * Permission is hereby granted, free of charge, to any person obtaining a
005 * copy of this software and associated documentation files (the "Software"),
006 * to deal in the Software without restriction, including without limitation
007 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
008 * and/or sell copies of the Software, and to permit persons to whom the
009 * Software is furnished to do so, subject to the following conditions:
010 *
011 * The above copyright notice and this permission notice shall be included in
012 * all copies or substantial portions of the Software.
013 *
014 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
015 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
016 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
017 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
018 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
019 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
020 * DEALINGS IN THE SOFTWARE.
021 */
022
023 package fi.iki.hsivonen.util;
024
025 /**
026 * @version $Id: StringLiteralUtil.java,v 1.4 2006/11/18 00:05:24 hsivonen Exp $
027 * @author hsivonen
028 */
029 public class StringLiteralUtil {
030 public static String unquotedCharLiteral(char c) {
031 // http://java.sun.com/docs/books/jls/second_edition/html/lexical.doc.html#101089
032 switch (c) {
033 case '\b':
034 return "\\b";
035 case '\t':
036 return "\\t";
037 case '\n':
038 return "\\n";
039 case '\f':
040 return "\\f";
041 case '\r':
042 return "\\r";
043 case '\"':
044 return "\\\"";
045 case '\'':
046 return "\\\'";
047 case '\\':
048 return "\\\\";
049 default:
050 if (c >= ' ' && c <= '~') {
051 return "" + c;
052 } else {
053 String hex = Integer.toHexString((int) c);
054 switch (hex.length()) {
055 case 1:
056 return "\\u000" + hex;
057 case 2:
058 return "\\u00" + hex;
059 case 3:
060 return "\\u0" + hex;
061 default:
062 return "\\u" + hex;
063 }
064 }
065 }
066 }
067
068 public static String charLiteral(char c) {
069 return "\'" + unquotedCharLiteral(c) + "\'";
070 }
071
072 public static String stringLiteral(CharSequence cs) {
073 if (cs == null) {
074 return "null";
075 }
076 StringBuilder sb = new StringBuilder();
077 sb.append('\"');
078 int len = cs.length();
079 for (int i = 0; i < len; i++) {
080 sb.append(unquotedCharLiteral(cs.charAt(i)));
081 }
082 sb.append('\"');
083 return sb.toString();
084 }
085
086 public static String charArrayLiteral(CharSequence cs) {
087 if (cs == null) {
088 return "null";
089 }
090 StringBuilder sb = new StringBuilder();
091 sb.append('{');
092 int len = cs.length();
093 for (int i = 0; i < len; i++) {
094 sb.append(" \'");
095 sb.append(unquotedCharLiteral(cs.charAt(i)));
096 sb.append("\',");
097 }
098 if (sb.length() > 1) {
099 sb.deleteCharAt(sb.length() - 1);
100 }
101 sb.append(" }");
102 return sb.toString();
103 }
104
105 }