编译原理-简单计算器的设计2

编译原理课下作业，简易计算器的java实现，GCU 编译原理课下作业，简易计算器的java实现，GCU

package experiment1;

import java.util.ArrayList;
import java.util.List;

/**
 * Created by haol on 2016/11/3.
 */
public class AnalyseStr {

        public static int i = 0;
        //isNumStr 记录是否遍历在数字串中，是的话则数字包括Zero和。并记录数字串的开头 否则 无
        //一旦便利到数字 则一直便利内部i++不跳出while循环，直到遇到非数字和第一个‘.‘
        public static boolean isNumStr = false;

        public List analyStr（String str） throws Exception {
                i = 0;
                isNumStr = false;
                str = str.trim（）;
                List tokens = new ArrayList（）;

                int begin = 0;

                while （i < str.length（）） {
                        String thisStr = str.substring（i i + 1）;
                        if （this.analyseIsNum（thisStr） ） {
                                if （!isNumStr） {
                                        begin = i;
                                }
                                isNumStr = true;

                                this.passNumStr（str）;
                                //遍历到下一个非数字的位置
                                i++;
                                if （i + 1 < str.length（） && str.substring（i i + 1）.equals（“.“）） {
                                        tokens = this.analyseIAfterDot（tokens str begin）;
                                } else {
                                        Token token = new Token（“5“ str.substring（begin i） str.substring（begin i） “int“）;
                                        tokens.add（token）;
                                        isNumStr = false;
                                }
                        } else if （thisStr.equals（“0“）） {
                                if （i+1                                        if（this.analyseIsNum（str.substring（i+1i+2）） || str.substring（i+1i+2）.equals（“0“））{
                                                Token token = new Token（“e“ str.substring（i i+1） “ERROR“ “0出现的位置不正确“）;
                                                tokens.add（token）;
                                                i++;
                                                isNumStr = false;
                                        }else {
                                                tokens = this.analyseIsZero（tokens str）;
                                        }
                                }else{
                                        Token token = new Token（“0“ str.substring（i i+1） str.substring（i i+1） “int“）;
                                        tokens.add（token）;
                                        i++;
                                        isNumStr = false;
                                }
                        } else {
                        /* 分析非数字并判断括号周围是否有误*/
                                tokens = this.analyseIsNotNum（tokens str）;
                        }
                }
                return tokens;
        }

        public bool

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2017-01-09 20:27  experiment1\
     文件        9403  2016-11-17 20:30  experiment1\AnalyseStr.java
     文件        1291  2016-11-17 20:28  experiment1\Complie_1.java
     文件        1579  2018-02-27 17:20  experiment1\FormatOut.java
     文件         549  2016-11-04 23:19  experiment1\read.txt
     文件         773  2016-11-17 22:20  experiment1\ReadText.java
     文件        2257  2016-11-17 20:05  experiment1\Token.java
     目录           0  2017-01-09 20:27  experiment2\
     目录           0  2017-01-09 20:27  experiment2\analyse\
     文件        8417  2016-11-26 01:37  experiment2\analyse\GuideTranslate.java
     文件         627  2016-11-26 01:37  experiment2\analyse\OperateFAC.java
     文件        2179  2016-11-26 01:36  experiment2\analyse\SemanticStake.java
     文件        3182  2016-11-26 01:43  experiment2\Complie_2.java
     目录           0  2017-01-09 20:27  experiment2\define\
     文件        4141  2016-11-22 22:19  experiment2\define\CreateSLRTable.java
     文件         802  2016-11-23 13:11  experiment2\define\FourAddressCode.java
     文件        2384  2016-11-26 01:38  experiment2\define\Mathexpression.java
     目录           0  2017-01-09 20:27  experiment2\operate\
     文件        4457  2016-11-26 01:39  experiment2\operate\Calculate.java
     文件        1902  2016-11-26 01:39  experiment2\operate\GetColumn.java
     文件        1159  2016-11-26 01:40  experiment2\operate\OperateList.java
     文件         826  2016-11-26 01:42  experiment2\operate\QuerySLR.java
     目录           0  2017-01-09 20:27  experiment2\ready\
     文件        1198  2016-11-26 01:43  experiment2\ready\GetToken.java
     文件         684  2018-02-27 17:20  experiment2\ready\Logger.java
     文件         817  2016-11-19 23:59  experiment2\ready\OperateToken.java