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/*
* 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 jdk.nashorn.internal.runtime.ParserException;
import jdk.nashorn.internal.runtime.options.Options;
/**
* Factory class for regular expressions. This class creates instances of {@link DefaultRegExp}.
* An alternative factory can be installed using the {@code nashorn.regexp.impl} system property.
*/
public class RegExpFactory {
private final static RegExpFactory instance;
private final static String JDK = "jdk";
private final static String JONI = "joni";
static {
final String impl = Options.getStringProperty("nashorn.regexp.impl", JONI);
switch (impl) {
case JONI:
instance = new JoniRegExp.Factory();
break;
case JDK:
instance = new RegExpFactory();
break;
default:
instance = null;
throw new InternalError("Unsupported RegExp factory: " + impl);
}
}
/**
* Creates a Regular expression from the given {@code pattern} and {@code flags} strings.
*
* @param pattern RegExp pattern string
* @param flags RegExp flags string
* @return new RegExp
* @throws ParserException if flags is invalid or pattern string has syntax error.
*/
protected RegExp compile(final String pattern, final String flags) throws ParserException {
return new DefaultRegExp(pattern, flags);
}
/**
* Compile a regexp with the given {@code source} and {@code flags}.
*
* @param pattern RegExp pattern string
* @param flags flag string
* @return new RegExp
* @throws ParserException if invalid source or flags
*/
public static RegExp create(final String pattern, final String flags) {
return instance.compile(pattern, flags);
}
/**
* Validate a regexp with the given {@code source} and {@code flags}.
*
* @param pattern RegExp pattern string
* @param flags flag string
*
* @throws ParserException if invalid source or flags
*/
// @SuppressWarnings({"unused"})
public static void validate(final String pattern, final String flags) throws ParserException {
instance.compile(pattern, flags);
}
/**
* Returns true if the instance uses the JDK's {@code java.util.regex} package.
*
* @return true if instance uses JDK regex package
*/
public static boolean usesJavaUtilRegex() {
return instance != null && instance.getClass() == RegExpFactory.class;
}
}
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