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 }
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