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/*
 * Copyright (c) 2001-2013 Oracle and/or its affiliates. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 *   - Neither the name of Oracle nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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 */

package com.sun.msv.grammar.util;

import com.sun.msv.grammar.AttributeExp;
import com.sun.msv.grammar.BinaryExp;
import com.sun.msv.grammar.ChoiceExp;
import com.sun.msv.grammar.ConcurExp;
import com.sun.msv.grammar.DataExp;
import com.sun.msv.grammar.ElementExp;
import com.sun.msv.grammar.ExpressionVisitorVoid;
import com.sun.msv.grammar.InterleaveExp;
import com.sun.msv.grammar.ListExp;
import com.sun.msv.grammar.MixedExp;
import com.sun.msv.grammar.OneOrMoreExp;
import com.sun.msv.grammar.OtherExp;
import com.sun.msv.grammar.ReferenceExp;
import com.sun.msv.grammar.SequenceExp;
import com.sun.msv.grammar.ValueExp;

/**
 * Visits all reachable expressions but do nothing.
 * 
 * Note that unless the derived class do something, this implementation
 * will recurse infinitely.
 * 
 * @author Kohsuke KAWAGUCHI
 */
public abstract class ExpressionWalker implements ExpressionVisitorVoid {
        
    public void onRef( ReferenceExp exp ) {
        exp.exp.visit(this);
    }
        
    public void onOther( OtherExp exp ) {
        exp.exp.visit(this);
    }
    
    public void onElement( ElementExp exp ) {
        exp.contentModel.visit(this);
    }
        
    public void onEpsilon() {}
    public void onNullSet() {}
    public void onAnyString() {}
    public void onData( DataExp exp ) {}
    public void onValue( ValueExp exp ) {}
        
    public void onInterleave( InterleaveExp exp ) {
        onBinExp(exp);
    }
        
    public void onConcur( ConcurExp exp ) {
        onBinExp(exp);
    }
            
    public void onChoice( ChoiceExp exp ) {
        onBinExp(exp);
    }
        
    public void onSequence( SequenceExp exp ) {
        onBinExp(exp);
    }
        
    public void onBinExp( BinaryExp exp ) {
        exp.exp1.visit(this);
        exp.exp2.visit(this);
    }
        
    public void onMixed( MixedExp exp ) {
        exp.exp.visit(this);
    }
    
    public void onList( ListExp exp ) {
        exp.exp.visit(this);
    }
    
    public void onOneOrMore( OneOrMoreExp exp ) {
        exp.exp.visit(this);
    }
        
    public void onAttribute( AttributeExp exp ) {
        exp.exp.visit(this);
    }
}