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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.regexp.joni.Matcher;
import jdk.nashorn.internal.runtime.regexp.joni.Option;
import jdk.nashorn.internal.runtime.regexp.joni.Regex;
import jdk.nashorn.internal.runtime.regexp.joni.Region;
import jdk.nashorn.internal.runtime.regexp.joni.Syntax;
import jdk.nashorn.internal.runtime.regexp.joni.exception.JOniException;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;
/**
* Regular expression implementation based on the Joni engine from the JRuby project.
*/
public class JoniRegExp extends RegExp {
/** Compiled Joni Regex */
private Regex regex;
/** Matcher */
private RegExpMatcher matcher;
/**
* Construct a Regular expression from the given {@code pattern} and {@code flags} strings.
*
* @param pattern RegExp pattern string
* @param flags RegExp flag string
* @throws ParserException if flags is invalid or pattern string has syntax error.
*/
public JoniRegExp(final String pattern, final String flags) throws ParserException {
super(pattern, flags);
int option = Option.SINGLELINE;
if (this.isIgnoreCase()) {
option |= Option.IGNORECASE;
}
if (this.isMultiline()) {
option &= ~Option.SINGLELINE;
option |= Option.NEGATE_SINGLELINE;
}
try {
RegExpScanner parsed;
try {
parsed = RegExpScanner.scan(pattern);
} catch (final PatternSyntaxException e) {
// refine the exception with a better syntax error, if this
// passes, just rethrow what we have
Pattern.compile(pattern, 0);
throw e;
}
if (parsed != null) {
char[] javaPattern = parsed.getJavaPattern().toCharArray();
this.regex = new Regex(javaPattern, 0, javaPattern.length, option, Syntax.JAVASCRIPT);
this.groupsInNegativeLookahead = parsed.getGroupsInNegativeLookahead();
}
} catch (final PatternSyntaxException e2) {
throwParserException("syntax", e2.getMessage());
} catch (JOniException e2) {
throwParserException("syntax", e2.getMessage());
}
}
@Override
public RegExpMatcher match(final String input) {
if (regex == null) {
return null;
}
RegExpMatcher currentMatcher = this.matcher;
if (currentMatcher == null || input != currentMatcher.getInput()) {
currentMatcher = new JoniMatcher(input);
this.matcher = currentMatcher;
}
return currentMatcher;
}
/**
* RegExp Factory class for Joni regexp engine.
*/
public static class Factory extends RegExpFactory {
@Override
protected RegExp compile(final String pattern, final String flags) throws ParserException {
return new JoniRegExp(pattern, flags);
}
}
class JoniMatcher implements RegExpMatcher {
final String input;
final Matcher matcher;
JoniMatcher(final String input) {
this.input = input;
this.matcher = regex.matcher(input.toCharArray());
}
@Override
public boolean search(final int start) {
return matcher.search(start, input.length(), Option.NONE) > -1;
}
@Override
public String getInput() {
return input;
}
@Override
public int start() {
return matcher.getBegin();
}
@Override
public int start(final int group) {
return group == 0 ? start() : matcher.getRegion().beg[group];
}
@Override
public int end() {
return matcher.getEnd();
}
@Override
public int end(final int group) {
return group == 0 ? end() : matcher.getRegion().end[group];
}
@Override
public String group() {
return input.substring(matcher.getBegin(), matcher.getEnd());
}
@Override
public String group(final int group) {
if (group == 0) {
return group();
}
final Region region = matcher.getRegion();
return input.substring(region.beg[group], region.end[group]);
}
@Override
public int groupCount() {
final Region region = matcher.getRegion();
return region == null ? 0 : region.numRegs - 1;
}
}
}
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