/* ASTPtUnaryNode represent the unary operator(!, -) nodes in the parse tree

 Copyright (c) 1998-2014 The Regents of the University of California.
 All rights reserved.
 Permission is hereby granted, without written agreement and without
 license or royalty fees, to use, copy, modify, and distribute this
 software and its documentation for any purpose, provided that the above
 copyright notice and the following two paragraphs appear in all copies
 of this software.

 IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY
 FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
 ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
 THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF
 SUCH DAMAGE.

 THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
 INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE
 PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND THE UNIVERSITY OF
 CALIFORNIA HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES,
 ENHANCEMENTS, OR MODIFICATIONS.

 PT_COPYRIGHT_VERSION_2
 COPYRIGHTENDKEY

 */
package ptolemy.data.expr;

import java.util.Map;

import ptolemy.kernel.util.IllegalActionException;

///////////////////////////////////////////////////////////////////
//// ASTPtUnaryNode

/**
 The parse tree created from the expression string consists of a
 hierarchy of node objects. This class represents unary operator(!, -, ~)
 nodes in the parse tree.

 @author Neil Smyth
 @version $Id: ASTPtUnaryNode.java 70398 2014-10-22 23:44:32Z cxh $
 @since Ptolemy II 0.2
 @Pt.ProposedRating Yellow (nsmyth)
 @Pt.AcceptedRating Red (cxh)
 @see ptolemy.data.expr.ASTPtRootNode
 @see ptolemy.data.expr.PtParser
 @see ptolemy.data.Token
 */
public class ASTPtUnaryNode extends ASTPtRootNode {
    ///////////////////////////////////////////////////////////////////
    ////                         public methods                    ////
    public ASTPtUnaryNode(int id) {
        super(id);
    }

    public ASTPtUnaryNode(PtParser p, int id) {
        super(p, id);
    }

    /** Return the token that represents the operation of this node.
     *  @return the token that represents the operation of this node.
     */
    public Token getOperator() {
        return _lexicalToken;
    }

    /** Return true if this node represents the bitwise negation of its
     *  child.
     *  @return true if this node represents the bitwise negation of its
     *  child.
     */
    public boolean isBitwiseNot() {
        return _isBitwiseNot;
    }

    /** Return true if this node is (hierarchically) congruent to the
     *  given node, under the given renaming of bound identifiers.
     *  Derived classes should extend this method to add additional
     *  necessary congruency checks.
     *  @param node The node to compare to.
     *  @param renaming A map from String to String that gives a
     *  renaming from identifiers in this node to identifiers in the
     *  given node.
     *  @return True if this node is congruent.
     */
    @Override
    public boolean isCongruent(ASTPtRootNode node, Map renaming) {
        if (!super.isCongruent(node, renaming)) {
            return false;
        }

        if (_lexicalToken.kind != ((ASTPtUnaryNode) node)._lexicalToken.kind) {
            return false;
        }

        return true;
    }

    /** Return true if this node represents the additive inverse of its
     *  child.
     *  @return true if this node represents the additive inverse of its
     *  child.
     */
    public boolean isMinus() {
        return _isMinus;
    }

    /** Return true if this node represents the boolean negation of its
     *  child.
     *  @return true if this node represents the boolean negation of
     *  its child.
     */
    public boolean isNot() {
        return _isNot;
    }

    /** Traverse this node with the given visitor.
     */
    @Override
    public void visit(ParseTreeVisitor visitor) throws IllegalActionException {
        visitor.visitUnaryNode(this);
    }

    ///////////////////////////////////////////////////////////////////
    ////                         protected variables               ////
    protected boolean _isMinus = false;

    protected boolean _isNot = false;

    protected boolean _isBitwiseNot = false;

    protected Token _lexicalToken = null;
}