structurecheckexpr.java

来自「<算法导论>第二版大部分算法实现. 1. 各类排序和顺序统计学相关」· Java 代码 · 共 36 行

/*
 * Copyright (C) 2003-2008 Wang Pengcheng <[e-mail]>
 * Permission is granted to copy, distribute and/or modify this
 * document under the terms of the GNU Free Documentation License,
 * Version 2.0 or any later version published by the Free Software Foundation;
 * with no Invariant Sections.
 * You may obtain a copy of the License at
 *   http://www.gnu.org/licenses/lgpl.txt
 */
//1 Mar 2008
package cn.edu.whu.iss.algorithm.unit10.expression.structure;

/**
 * Check the expression of structure.
 * @author wpc
 * @version 0.0.1
 */
public interface StructureCheckExpr {
	
	String BLANK_STRING = " ";
	String POINT = "^";
	
	/**
	 * Check the expression's structure.
	 * @param expr the expression.
	 * @return
	 */
	boolean isExpressionStructureRight(String expr);
	/**
	 * Return the error message on the expresson's structure.
	 * @return
	 */
	String getErrorMessage(String expr);

}