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/*
 * Copyright 2011, TAUTUA
 *
 * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.tautua.markdownpapers.ast;

/* All AST nodes must implement this interface.  It provides basic
   machinery for constructing the parent and child relationships
   between nodes. */

public interface Node {

    /**
     * This method is called after the node has been made the current
     * node.  It indicates that child nodes can now be added to it.
     */
    public void jjtOpen();

    /**
     * This method is called after all the child nodes have been
     * added.
     */
    public void jjtClose();

    /**
     * This pair of methods are used to inform the node of its
     * parent.
     */
    public void jjtSetParent(Node n);

    public Node jjtGetParent();

    /**
     * This method tells the node to add its argument to the node's
     * list of children.
     */
    public void jjtAddChild(Node n, int i);

    /**
     * This method returns a child node.  The children are numbered
     * from zero, left to right.
     */
    public Node jjtGetChild(int i);

    /**
     * Return the number of children the node has.
     */
    public int jjtGetNumChildren();

    public void accept(Visitor visitor);
}