1 /* 2 * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package jdk.nashorn.internal.runtime.regexp; 27 28 import jdk.nashorn.internal.parser.Lexer; 29 import jdk.nashorn.internal.runtime.ParserException; 30 import jdk.nashorn.internal.runtime.options.Options; 31 32 /** 33 * Factory class for regular expressions. This class creates instances of {@link DefaultRegExp}. 34 * An alternative factory can be installed using the {@code nashorn.regexp.impl} system property. 35 */ 36 public class RegExpFactory { 37 38 39 private final static RegExpFactory instance; 40 41 private final static String JDK = "jdk"; 42 private final static String JONI = "joni"; 43 44 static { 45 final String impl = Options.getStringProperty("nashorn.regexp.impl", JDK); 46 switch (impl) { 47 case JONI: 48 instance = new JoniRegExp.Factory(); 49 break; 50 case JDK: 51 instance = new RegExpFactory(); 52 break; 53 default: 54 instance = null; 55 throw new InternalError("Unsupported RegExp factory: " + impl); 56 } 57 } 58 59 /** 60 * Creates a Regular expression from the given {@code pattern} and {@code flags} strings. 61 * 62 * @param pattern RegExp pattern string 63 * @param flags RegExp flags string 64 * @throws ParserException if flags is invalid or pattern string has syntax error. 65 */ 66 protected RegExp compile(final String pattern, final String flags) throws ParserException { 67 return new DefaultRegExp(pattern, flags); 68 } 69 70 /** 71 * Replace a regexp token as suitable for regexp instances created by this factory. 72 * 73 * @param str a regular expression token 74 * @return the replacement token 75 */ 76 protected String replaceToken(final String str) { 77 switch (str) { 78 case "\\s": 79 return "[" + Lexer.getWhitespaceRegExp() + "]"; 80 case "\\S": 81 return "[^" + Lexer.getWhitespaceRegExp() + "]"; 82 case "[^]": 83 return "[\\s\\S]"; 84 default: 85 return str; 86 } 87 } 88 89 /** 90 * Compile a regexp with the given {@code source} and {@code flags}. 91 * 92 * @param pattern RegExp pattern string 93 * @param flags flag string 94 * 95 * @throws ParserException if invalid source or flags 96 */ 97 public static RegExp create(final String pattern, final String flags) { 98 return instance.compile(pattern, flags); 99 } 100 101 /** 102 * Replace a regexp token as needed by the currently installed factory instance. 103 * 104 * @param token a regexp token 105 * @return the replacement token 106 */ 107 public static String replace(final String token) { 108 return instance.replaceToken(token); 109 } 110 111 /** 112 * Validate a regexp with the given {@code source} and {@code flags}. 113 * 114 * @param pattern RegExp pattern string 115 * @param flags flag string 116 * 117 * @throws ParserException if invalid source or flags 118 */ 119 // @SuppressWarnings({"unused"}) 120 public static void validate(final String pattern, final String flags) throws ParserException { 121 instance.compile(pattern, flags); 122 } 123 }