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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 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;
/**
* 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();
}
}
}
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