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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