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/*******************************************************************************
 * Copyright (c) 2000, 2007 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.text.edits;

/**
 * A visitor for text edits.
 * 
 * For each different concrete text edit type T there is a method:
 * 
 * 
 *   public boolean visit(T node) - Visits the given edit to
 *   perform some arbitrary operation. If true  is returned, the given edit's
 *   child edits will be visited next; however, if false is returned, the
 *   given edit's child edits will not be visited. The default implementation provided by
 *   this class calls a generic method visitNode(TextEdit node).
 *   Subclasses may reimplement these method as needed.
 * 
 * 
 * In addition, there are methods for visiting text edits in the
 * abstract, regardless of node type:
 * 
 * 
 *   public void preVisit(TextEdit edit) - Visits
 *   the given edit to perform some arbitrary operation.
 *   This method is invoked prior to the appropriate type-specific
 *   visit method.
 *   The default implementation of this method does nothing.
 *   Subclasses may reimplement this method as needed.
 *
 *   public void postVisit(TextEdit edit) - Visits
 *   the given edit to perform some arbitrary operation.
 *   This method is invoked after the appropriate type-specific
 *   endVisit method.
 *   The default implementation of this method does nothing.
 *   Subclasses may reimplement this method as needed.
 * 
 * 
 * For edits with children, the child nodes are visited in increasing order.
 * 
 *
 * @see TextEdit#accept(TextEditVisitor)
 * @since 3.0
 */
public class TextEditVisitor {

	/**
	 * Visits the given text edit prior to the type-specific visit.
	 * (before visit).
	 * 
	 * The default implementation does nothing. Subclasses may reimplement.
	 * 
	 *
	 * @param edit the node to visit
	 */
	public void preVisit(TextEdit edit) {
		// default implementation: do nothing
	}

	/**
	 * Visits the given text edit following the type-specific visit
	 * (after endVisit).
	 * 
	 * The default implementation does nothing. Subclasses may reimplement.
	 * 
	 *
	 * @param edit the node to visit
	 */
	public void postVisit(TextEdit edit) {
		// default implementation: do nothing
	}

	/**
	 * Visits the given text edit. This method is called by default from
	 * type-specific visits. It is not called by an edit's accept method.
	 * The default implementation returns true.
	 *
	 * @param edit the node to visit
	 * @return If true is returned, the given node's child
	 *  nodes will be visited next; however, if false is
	 *  returned, the given node's child nodes will not be visited.
	 */
	public boolean visitNode(TextEdit edit) {
		return true;
	}

	/**
	 * Visits a CopySourceEdit instance.
	 *
	 * @param edit the node to visit
	 * @return If true is returned, the given node's child
	 *  nodes will be visited next; however, if false is
	 *  returned, the given node's child nodes will not be visited.
	 */
	public boolean visit(CopySourceEdit edit) {
		return visitNode(edit);
	}

	/**
	 * Visits a CopyTargetEdit instance.
	 *
	 * @param edit the node to visit
	 * @return If true is returned, the given node's child
	 *  nodes will be visited next; however, if false is
	 *  returned, the given node's child nodes will not be visited.
	 */
	public boolean visit(CopyTargetEdit edit) {
		return visitNode(edit);
	}

	/**
	 * Visits a MoveSourceEdit instance.
	 *
	 * @param edit the node to visit
	 * @return If true is returned, the given node's child
	 *  nodes will be visited next; however, if false is
	 *  returned, the given node's child nodes will not be visited.
	 */
	public boolean visit(MoveSourceEdit edit) {
		return visitNode(edit);
	}

	/**
	 * Visits a MoveTargetEdit instance.
	 *
	 * @param edit the node to visit
	 * @return If true is returned, the given node's child
	 *  nodes will be visited next; however, if false is
	 *  returned, the given node's child nodes will not be visited.
	 */
	public boolean visit(MoveTargetEdit edit) {
		return visitNode(edit);
	}

	/**
	 * Visits a RangeMarker instance.
	 *
	 * @param edit the node to visit
	 * @return If true is returned, the given node's child
	 *  nodes will be visited next; however, if false is
	 *  returned, the given node's child nodes will not be visited.
	 */
	public boolean visit(RangeMarker edit) {
		return visitNode(edit);
	}

	/**
	 * Visits a CopyingRangeMarker instance.
	 *
	 * @param edit the node to visit
	 * @return If true is returned, the given node's child
	 *  nodes will be visited next; however, if false is
	 *  returned, the given node's child nodes will not be visited.
	 */
	public boolean visit(CopyingRangeMarker edit) {
		return visitNode(edit);
	}

	/**
	 * Visits a DeleteEdit instance.
	 *
	 * @param edit the node to visit
	 * @return If true is returned, the given node's child
	 *  nodes will be visited next; however, if false is
	 *  returned, the given node's child nodes will not be visited.
	 */
	public boolean visit(DeleteEdit edit) {
		return visitNode(edit);
	}

	/**
	 * Visits a InsertEdit instance.
	 *
	 * @param edit the node to visit
	 * @return If true is returned, the given node's child
	 *  nodes will be visited next; however, if false is
	 *  returned, the given node's child nodes will not be visited.
	 */
	public boolean visit(InsertEdit edit) {
		return visitNode(edit);
	}

	/**
	 * Visits a ReplaceEdit instance.
	 *
	 * @param edit the node to visit
	 * @return If true is returned, the given node's child
	 *  nodes will be visited next; however, if false is
	 *  returned, the given node's child nodes will not be visited.
	 */
	public boolean visit(ReplaceEdit edit) {
		return visitNode(edit);
	}

	/**
	 * Visits a UndoEdit instance.
	 *
	 * @param edit the node to visit
	 * @return If true is returned, the given node's child
	 *  nodes will be visited next; however, if false is
	 *  returned, the given node's child nodes will not be visited.
	 */
	public boolean visit(UndoEdit edit) {
		return visitNode(edit);
	}

	/**
	 * Visits a MultiTextEdit instance.
	 *
	 * @param edit the node to visit
	 * @return If true is returned, the given node's child
	 *  nodes will be visited next; however, if false is
	 *  returned, the given node's child nodes will not be visited.
	 */
	public boolean visit(MultiTextEdit edit) {
		return visitNode(edit);
	}
}