expression.java

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package scriptedit.data;

import java.util.*;
/**
 * <p>Title: Expression</p>
 * <p>Description: 2006年3月28日</p>
 * <p>Copyright: CoCoMo Copyright (c) 2006</p>
 * <p>Company: 9you</p>
 * @author 郭昉
 * @version 1.1
 */

public class Expression {
  public static final int LPAREN = 1; //左括号 不被输出
  public static final int RPAREN = 2; //右括号 不被输出
  public static final int EQ = 10;    //等于
  public static final int NE = 11;    //不等于
  public static final int LT = 12;    //小于
  public static final int GT = 13;    //大于
  public static final int LE = 14;    //小于等于
  public static final int GE = 15;    //大于等于
  public static final int OR = 16;    //或
  public static final int AND = 17;   //和

  private Stack oStack = new Stack();
  private Stack tStack = new Stack();
  public Expression() {
  }

  public void pushO(Teminal t) {
    oStack.push(t);
  }

  public void pushT(Teminal t) {
    tStack.push(t);
  }

  public Teminal popO() {
    return (Teminal) oStack.pop();
  }

  public Teminal popT() {
    return (Teminal) tStack.pop();
  }

  public Teminal peekO() {
    return (Teminal) oStack.peek();
  }

  public Teminal peekT() {
    return (Teminal) tStack.peek();
  }

  public int oStackSize() {
    return oStack.size();
  }

  public int tStackSize() {
    return tStack.size();
  }
}