variable.cs

关于CMM语言的解释器

using System;
using System.Collections.Generic;
using System.Text;
using System.Collections;

namespace CmmInterpretor
{
    class Variable
    {
        //ID
        private string vId;
        //类型
        private int vType;
        //变量值在值列表中的索引
        private int vIndex;
        //数组变量长度
        private int vArrLength;
        //变量层次，与声明语句层次相同
        private int vLevel;

        public Variable()
        {
        }

        public Variable(string id)
        {
            vId = id;
        }

        public Variable(string id, int type)
        {
            vId = id;
            vType = type;
        }

        public string VID
        {
            get { return vId; }
            set { vId = value.Trim(); }
        }

        public int VType
        {
            get { return vType; }
            set { vType = value; }
        }

        public int VIndex
        {
            get { return vIndex; }
            set { vIndex = value; }
        }

        public int VLevel
        {
            get { return vLevel; }
            set { vLevel = value; }
        }
        public int VArrLength
        {
            get { return vArrLength; }
            set { vArrLength = value; }
        }



        //获得变量的值(数组)
        public bool GetValue(ArrayList ValueLst, int arrayIndex, ref int varValue)
        {
            if (vType == INTG && arrayIndex >= 0 && arrayIndex < vArrLength)
            {
                try
                {
                    varValue = Convert.ToInt32(ValueLst[vIndex + arrayIndex]);
                    return true;
                }
                catch (Exception excp)
                {
                    return false;
                }
            }
            else
                return false;
        }
        public bool GetValue(ArrayList ValueLst, int arrayIndex, ref double varValue)
        {
            if (vType == REAL && arrayIndex >= 0 && arrayIndex < vArrLength)
            {
                try
                {
                    varValue = Convert.ToDouble(ValueLst[vIndex + arrayIndex]);
                    return true;
                }
                catch (Exception excp)
                {
                    return false;
                }
            }
            else
                return false;

        }

        //获得变量的值(非数组)
        public bool GetValue(ArrayList ValueLst, ref int varValue)
        {
            return GetValue(ValueLst, 0, ref varValue);
        }
        public bool GetValue(ArrayList ValueLst, ref double varValue)
        {
            return GetValue(ValueLst, 0, ref varValue);
        }



        //词句类型常量
        const int ERROR = -1;        //错误
        //保留字
        const int RSVWORD = -11;
        //标识符
        const int ID = -12;
        //数组标识符
        const int ARR_ID = -13;
        //整数
        const int INTG = -14;
        //实数
        const int REAL = -15;
        //null语句
        const int NULLST = -31;
        //空语句
        const int EMPTY = -32;
        //复合语句
        const int COMPLEX = -33;
        //声明语句
        const int DECLARE = -34;
        //赋值语句
        const int ASSIGN = -37;
        //输入语句
        const int INPUT = -39;
        //输出语句
        const int OUTPUT = -41;
        //if选择语句
        const int SELECT = -42;
        //if-else选择语句的else分支
        const int ELSE_BR = -44;
        //while循环语句
        const int LOOP = -45;
        //算术表达式
        const int ARTHM_EXP = -46;
        //关系表达式
        const int RELAT_EXP = -47;
        //非数组
        const string NOTARR = "NotArr";
        //未赋值
        const string NOTASS = "NotAss";
    }

    class IntVar : Variable
    {
    }

    class RealVar : Variable
    {
    }
}