| /* |
| * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package jdk.nashorn.internal.runtime.regexp; |
| |
| import static java.util.regex.Pattern.CASE_INSENSITIVE; |
| import static java.util.regex.Pattern.MULTILINE; |
| import static java.util.regex.Pattern.UNICODE_CASE; |
| |
| import java.util.regex.Matcher; |
| import java.util.regex.Pattern; |
| import java.util.regex.PatternSyntaxException; |
| import jdk.nashorn.internal.runtime.ParserException; |
| |
| /** |
| * Default regular expression implementation based on java.util.regex package. |
| * |
| * Note that this class is not thread-safe as it stores the current match result |
| * and the string being matched in instance fields. |
| */ |
| public class JdkRegExp extends RegExp { |
| |
| /** Java regexp pattern to use for match. We compile to one of these */ |
| private Pattern pattern; |
| |
| /** |
| * Construct a Regular expression from the given {@code source} and {@code flags} strings. |
| * |
| * @param source RegExp source string |
| * @param flags RegExp flag string |
| * @throws ParserException if flags is invalid or source string has syntax error. |
| */ |
| public JdkRegExp(final String source, final String flags) throws ParserException { |
| super(source, flags); |
| |
| int intFlags = 0; |
| |
| if (isIgnoreCase()) { |
| intFlags |= CASE_INSENSITIVE | UNICODE_CASE; |
| } |
| if (isMultiline()) { |
| intFlags |= MULTILINE; |
| } |
| |
| try { |
| RegExpScanner parsed; |
| |
| try { |
| parsed = RegExpScanner.scan(source); |
| } catch (final PatternSyntaxException e) { |
| // refine the exception with a better syntax error, if this |
| // passes, just rethrow what we have |
| Pattern.compile(source, intFlags); |
| throw e; |
| } |
| |
| if (parsed != null) { |
| this.pattern = Pattern.compile(parsed.getJavaPattern(), intFlags); |
| this.groupsInNegativeLookahead = parsed.getGroupsInNegativeLookahead(); |
| } |
| } catch (final PatternSyntaxException e2) { |
| throwParserException("syntax", e2.getMessage()); |
| } |
| } |
| |
| @Override |
| public RegExpMatcher match(final String str) { |
| if (pattern == null) { |
| return null; // never matches or similar, e.g. a[] |
| } |
| |
| return new DefaultMatcher(str); |
| } |
| |
| class DefaultMatcher implements RegExpMatcher { |
| final String input; |
| final Matcher defaultMatcher; |
| |
| DefaultMatcher(final String input) { |
| this.input = input; |
| this.defaultMatcher = pattern.matcher(input); |
| } |
| |
| @Override |
| public boolean search(final int start) { |
| return defaultMatcher.find(start); |
| } |
| |
| @Override |
| public String getInput() { |
| return input; |
| } |
| |
| @Override |
| public int start() { |
| return defaultMatcher.start(); |
| } |
| |
| @Override |
| public int start(final int group) { |
| return defaultMatcher.start(group); |
| } |
| |
| @Override |
| public int end() { |
| return defaultMatcher.end(); |
| } |
| |
| @Override |
| public int end(final int group) { |
| return defaultMatcher.end(group); |
| } |
| |
| @Override |
| public String group() { |
| return defaultMatcher.group(); |
| } |
| |
| @Override |
| public String group(final int group) { |
| return defaultMatcher.group(group); |
| } |
| |
| @Override |
| public int groupCount() { |
| return defaultMatcher.groupCount(); |
| } |
| } |
| |
| } |