jdk8-mips64-public/nashorn: src/jdk/nashorn/internal/runtime/regexp/JdkRegExp.java@52348a92adca

     1 /*

     2  * Copyright (c) 2010, 2019, 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  */

    26 package jdk.nashorn.internal.runtime.regexp;

    28 import static java.util.regex.Pattern.CASE_INSENSITIVE;

    29 import static java.util.regex.Pattern.MULTILINE;

    30 import static java.util.regex.Pattern.UNICODE_CASE;

    32 import java.util.regex.Matcher;

    33 import java.util.regex.Pattern;

    34 import java.util.regex.PatternSyntaxException;

    35 import jdk.nashorn.internal.runtime.ParserException;

    37 /**

    38  * Default regular expression implementation based on java.util.regex package.

    39  *

    40  * Note that this class is not thread-safe as it stores the current match result

    41  * and the string being matched in instance fields.

    42  */

    43 public class JdkRegExp extends RegExp {

    45     /** Java regexp pattern to use for match. We compile to one of these */

    46     private Pattern pattern;

    48     /**

    49      * Construct a Regular expression from the given {@code source} and {@code flags} strings.

    50      *

    51      * @param source RegExp source string

    52      * @param flags RegExp flag string

    53      * @throws ParserException if flags is invalid or source string has syntax error.

    54      */

    55     public JdkRegExp(final String source, final String flags) throws ParserException {

    56         super(source, flags);

    58         int intFlags = 0;

    60         if (isIgnoreCase()) {

    61             intFlags |= CASE_INSENSITIVE | UNICODE_CASE;

    62         }

    63         if (isMultiline()) {

    64             intFlags |= MULTILINE;

    65         }

    67         try {

    68             RegExpScanner parsed;

    70             try {

    71                 parsed = RegExpScanner.scan(source);

    72             } catch (final PatternSyntaxException e) {

    73                 // refine the exception with a better syntax error, if this

    74                 // passes, just rethrow what we have

    75                 Pattern.compile(source, intFlags);

    76                 throw e;

    77             }

    79             if (parsed != null) {

    80                 this.pattern = Pattern.compile(parsed.getJavaPattern(), intFlags);

    81                 this.groupsInNegativeLookahead = parsed.getGroupsInNegativeLookahead();

    82             }

    83         } catch (final PatternSyntaxException e2) {

    84             throwParserException("syntax", e2.getMessage());

    85         } catch (StackOverflowError e3) {

    86             throw new RuntimeException(e3);

    87         }

    88     }

    90     @Override

    91     public RegExpMatcher match(final String str) {

    92         if (pattern == null) {

    93             return null; // never matches or similar, e.g. a[]

    94         }

    96         return new DefaultMatcher(str);

    97     }

    99     class DefaultMatcher implements RegExpMatcher {

   100         final String input;

   101         final Matcher defaultMatcher;

   103         DefaultMatcher(final String input) {

   104             this.input = input;

   105             this.defaultMatcher = pattern.matcher(input);

   106         }

   108         @Override

   109         public boolean search(final int start) {

   110             return defaultMatcher.find(start);

   111         }

   113         @Override

   114         public String getInput() {

   115             return input;

   116         }

   118         @Override

   119         public int start() {

   120             return defaultMatcher.start();

   121         }

   123         @Override

   124         public int start(final int group) {

   125             return defaultMatcher.start(group);

   126         }

   128         @Override

   129         public int end() {

   130             return defaultMatcher.end();

   131         }

   133         @Override

   134         public int end(final int group) {

   135             return defaultMatcher.end(group);

   136         }

   138         @Override

   139         public String group() {

   140             return defaultMatcher.group();

   141         }

   143         @Override

   144         public String group(final int group) {

   145             return defaultMatcher.group(group);

   146         }

   148         @Override

   149         public int groupCount() {

   150             return defaultMatcher.groupCount();

   151         }

   152     }

   154 }

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