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 31 /** 32 * Factory class for regular expressions. This class creates instances of {@link DefaultRegExp}. 33 */ 34 public class RegExpFactory { 35 36 37 private final static RegExpFactory instance = new RegExpFactory(); 38 39 /** 40 * Creates a Regular expression from the given {@code pattern} and {@code flags} strings. 41 * 42 * @param pattern RegExp pattern string 43 * @param flags RegExp flags string 44 * @throws ParserException if flags is invalid or pattern string has syntax error. 45 */ 46 protected RegExp compile(final String pattern, final String flags) throws ParserException { 47 return new DefaultRegExp(pattern, flags); 48 } 49 50 /** 51 * Replace a regexp token as suitable for regexp instances created by this factory. 52 * 53 * @param str a regular expression token 54 * @return the replacement token 55 */ 56 protected String replaceToken(final String str) { 57 switch (str) { 58 case "\\s": 59 return "[" + Lexer.getWhitespaceRegExp() + "]"; 60 case "\\S": 61 return "[^" + Lexer.getWhitespaceRegExp() + "]"; 62 case "[^]": 63 return "[\\s\\S]"; 64 default: 65 return str; 66 } 67 } 68 69 /** 70 * Compile a regexp with the given {@code source} and {@code flags}. 71 * 72 * @param pattern RegExp pattern string 73 * @param flags flag string 74 * 75 * @throws ParserException if invalid source or flags 76 */ 77 public static RegExp create(final String pattern, final String flags) { 78 return instance.compile(pattern, flags); 79 } 80 81 /** 82 * Replace a regexp token as needed by the currently installed factory instance. 83 * 84 * @param token a regexp token 85 * @return the replacement token 86 */ 87 public static String replace(final String token) { 88 return instance.replaceToken(token); 89 } 90 91 /** 92 * Validate a regexp with the given {@code source} and {@code flags}. 93 * 94 * @param pattern RegExp pattern string 95 * @param flags flag string 96 * 97 * @throws ParserException if invalid source or flags 98 */ 99 // @SuppressWarnings({"unused"}) 100 public static void validate(final String pattern, final String flags) throws ParserException { 101 instance.compile(pattern, flags); 102 } 103 }