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/*
***** BEGIN LICENSE BLOCK *****
* Version: EPL 1.0/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Eclipse Public
* License Version 1.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.eclipse.org/legal/epl-v10.html
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* Copyright (C) 2001-2002 Jan Arne Petersen <jpetersen@uni-bonn.de>
* Copyright (C) 2001-2002 Benoit Cerrina <b.cerrina@wanadoo.fr>
* Copyright (C) 2002 Anders Bengtsson <ndrsbngtssn@yahoo.se>
* Copyright (C) 2004 Thomas E Enebo <enebo@acm.org>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the EPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the EPL, the GPL or the LGPL.
***** END LICENSE BLOCK *****/
package org.jruby.ast;
import java.util.List;
import org.jruby.Ruby;
import org.jruby.RubyMatchData;
import org.jruby.RubyRegexp;
import org.jruby.RubyString;
import org.jruby.ast.visitor.NodeVisitor;
import org.jruby.lexer.yacc.ISourcePosition;
import org.jruby.runtime.Block;
import org.jruby.runtime.ThreadContext;
import org.jruby.runtime.builtin.IRubyObject;
import org.jruby.util.ByteList;
import org.jruby.util.DefinedMessage;
/**
* Regexp back reference:
* - $& last successful match
* - $+ highest numbered group matched in last successful match.
* - $` what precedes the last successful match
* - $' what follows the last successful match
*/
public class BackRefNode extends Node {
/**
* the character which generated the back reference
**/
private final char type;
/** ByteList for the name of this backref global */
private final DefinedMessage definedMessage;
public BackRefNode(ISourcePosition position, int type) {
super(position);
this.type = (char) type;
this.definedMessage = DefinedMessage.byText("$" + (char)type);
}
public NodeType getNodeType() {
return NodeType.BACKREFNODE;
}
/**
* Accept for the visitor pattern.
* @param iVisitor the visitor
**/
public Object accept(NodeVisitor iVisitor) {
return iVisitor.visitBackRefNode(this);
}
/**
* Gets the type
*
* @return the character which generates the back reference
*/
public char getType() {
return type;
}
public List<Node> childNodes() {
return EMPTY_LIST;
}
@Override
public IRubyObject interpret(Ruby runtime, ThreadContext context, IRubyObject self, Block aBlock) {
IRubyObject backref = context.getCurrentScope().getBackRef(runtime);
switch (type) {
case '&':
return RubyRegexp.last_match(backref);
case '`':
return RubyRegexp.match_pre(backref);
case '\'':
return RubyRegexp.match_post(backref);
case '+':
return RubyRegexp.match_last(backref);
default:
assert false: "backref with invalid type";
return null;
}
}
@Override
public RubyString definition(Ruby runtime, ThreadContext context, IRubyObject self, Block aBlock) {
IRubyObject backref = context.getCurrentScope().getBackRef(runtime);
if (backref instanceof RubyMatchData) {
return runtime.getDefinedMessage(runtime.is1_9() ? DefinedMessage.GLOBAL_VARIABLE : definedMessage);
}
return null;
}
}