/DotNet.Framework.Common/FormulaExpress.cs

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;



namespace DotNet.Framework.Common

{

    /// <summary>

    /// 计算公式枚举

    /// </summary>

    public enum EnumFormula

    {

        /// <summary>

        /// 加号

        /// </summary>

        Add,//加号

        /// <summary>

        /// 减号

        /// </summary>

        Dec,//减号

        /// <summary>

        /// 乘号

        /// </summary>

        Mul,//乘号

        /// <summary>

        /// 除号

        /// </summary>

        Div,//除号

        /// <summary>

        /// 正玄

        /// </summary>

        Sin,//正玄

        /// <summary>

        /// 余玄

        /// </summary>

        Cos,//余玄

        /// <summary>

        /// 正切

        /// </summary>

        Tan,//正切

        /// <summary>

        /// 余切

        /// </summary>

        ATan,//余切

        /// <summary>

        /// 平方根

        /// </summary>

        Sqrt,//平方根

        /// <summary>

        /// 求幂

        /// </summary>

        Pow,//求幂

        /// <summary>

        /// 无

        /// </summary>

        None,//无

    }



    /// <summary>

    /// FormulaDeal

    /// </summary>

    public class FormulaDeal

    {

        static FormulaDeal()

        {



        }

        private double CalculateExpress(string strExpression)

        {

            string strTemp = "";

            string strTempB = "";

            string strOne = "";

            string strTwo = "";

            double ReplaceValue = 0;

            while (strExpression.IndexOf("+") != -1 || strExpression.IndexOf("-") != -1

            || strExpression.IndexOf("*") != -1 || strExpression.IndexOf("/") != -1)

            {

                if (strExpression.IndexOf("*") != -1)

                {

                    strTemp = strExpression.Substring(strExpression.IndexOf("*") + 1, strExpression.Length - strExpression.IndexOf("*") - 1);

                    strTempB = strExpression.Substring(0, strExpression.IndexOf("*"));

                    strOne = strTempB.Substring(GetPrivorPos(strTempB) + 1, strTempB.Length - GetPrivorPos(strTempB) - 1);



                    strTwo = strTemp.Substring(0, GetNextPos(strTemp));

                    ReplaceValue = Convert.ToDouble(GetExpType(strOne)) * Convert.ToDouble(GetExpType(strTwo));

                    strExpression = strExpression.Replace(strOne + "*" + strTwo, ReplaceValue.ToString());

                }

                else if (strExpression.IndexOf("/") != -1)

                {

                    strTemp = strExpression.Substring(strExpression.IndexOf("/") + 1, strExpression.Length - strExpression.IndexOf("/") - 1);

                    strTempB = strExpression.Substring(0, strExpression.IndexOf("/"));

                    strOne = strTempB.Substring(GetPrivorPos(strTempB) + 1, strTempB.Length - GetPrivorPos(strTempB) - 1);





                    strTwo = strTemp.Substring(0, GetNextPos(strTemp));

                    ReplaceValue = Convert.ToDouble(GetExpType(strOne)) / Convert.ToDouble(GetExpType(strTwo));

                    strExpression = strExpression.Replace(strOne + "/" + strTwo, ReplaceValue.ToString());

                }

                else if (strExpression.IndexOf("+") != -1)

                {

                    strTemp = strExpression.Substring(strExpression.IndexOf("+") + 1, strExpression.Length - strExpression.IndexOf("+") - 1);

                    strTempB = strExpression.Substring(0, strExpression.IndexOf("+"));

                    strOne = strTempB.Substring(GetPrivorPos(strTempB) + 1, strTempB.Length - GetPrivorPos(strTempB) - 1);



                    strTwo = strTemp.Substring(0, GetNextPos(strTemp));

                    ReplaceValue = Convert.ToDouble(GetExpType(strOne)) + Convert.ToDouble(GetExpType(strTwo));

                    strExpression = strExpression.Replace(strOne + "+" + strTwo, ReplaceValue.ToString());

                }

                else if (strExpression.IndexOf("-") != -1)

                {

                    strTemp = strExpression.Substring(strExpression.IndexOf("-") + 1, strExpression.Length - strExpression.IndexOf("-") - 1);

                    strTempB = strExpression.Substring(0, strExpression.IndexOf("-"));

                    strOne = strTempB.Substring(GetPrivorPos(strTempB) + 1, strTempB.Length - GetPrivorPos(strTempB) - 1);





                    strTwo = strTemp.Substring(0, GetNextPos(strTemp));

                    ReplaceValue = Convert.ToDouble(GetExpType(strOne)) - Convert.ToDouble(GetExpType(strTwo));

                    strExpression = strExpression.Replace(strOne + "-" + strTwo, ReplaceValue.ToString());

                }

            }

            return Convert.ToDouble(strExpression);

        }



        private double CalculateExExpress(string strExpression, EnumFormula ExpressType)

        {

            double retValue = 0;

            switch (ExpressType)

            {

                case EnumFormula.Sin:

                    retValue = Math.Sin(Convert.ToDouble(strExpression));

                    break;

                case EnumFormula.Cos:

                    retValue = Math.Cos(Convert.ToDouble(strExpression));

                    break;

                case EnumFormula.Tan:

                    retValue = Math.Tan(Convert.ToDouble(strExpression));

                    break;

                case EnumFormula.ATan:

                    retValue = Math.Atan(Convert.ToDouble(strExpression));

                    break;

                case EnumFormula.Sqrt:

                    retValue = Math.Sqrt(Convert.ToDouble(strExpression));

                    break;

                case EnumFormula.Pow:

                    retValue = Math.Pow(Convert.ToDouble(strExpression), 2);

                    break;

            }

            if (retValue == 0) return Convert.ToDouble(strExpression);

            return retValue;

        }





        private int GetNextPos(string strExpression)

        {

            int[] ExpPos = new int[4];

            ExpPos[0] = strExpression.IndexOf("+");

            ExpPos[1] = strExpression.IndexOf("-");

            ExpPos[2] = strExpression.IndexOf("*");

            ExpPos[3] = strExpression.IndexOf("/");

            int tmpMin = strExpression.Length;

            for (int count = 1; count <= ExpPos.Length; count++)

            {

                if (tmpMin > ExpPos[count - 1] && ExpPos[count - 1] != -1)

                {

                    tmpMin = ExpPos[count - 1];

                }

            }

            return tmpMin;

        }





        private int GetPrivorPos(string strExpression)

        {

            int[] ExpPos = new int[4];

            ExpPos[0] = strExpression.LastIndexOf("+");

            ExpPos[1] = strExpression.LastIndexOf("-");

            ExpPos[2] = strExpression.LastIndexOf("*");

            ExpPos[3] = strExpression.LastIndexOf("/");

            int tmpMax = -1;

            for (int count = 1; count <= ExpPos.Length; count++)

            {

                if (tmpMax < ExpPos[count - 1] && ExpPos[count - 1] != -1)

                {

                    tmpMax = ExpPos[count - 1];

                }

            }

            return tmpMax;



        }

        public string SpiltExpression(string strExpression)

        {

            string strTemp = "";

            string strExp = "";

            while (strExpression.IndexOf("(") != -1)

            {

                strTemp = strExpression.Substring(strExpression.LastIndexOf("(") + 1, strExpression.Length - strExpression.LastIndexOf("(") - 1);

                strExp = strTemp.Substring(0, strTemp.IndexOf(")"));

                strExpression = strExpression.Replace("(" + strExp + ")", CalculateExpress(strExp).ToString());

            }

            if (strExpression.IndexOf("+") != -1 || strExpression.IndexOf("-") != -1

            || strExpression.IndexOf("*") != -1 || strExpression.IndexOf("/") != -1)

            {

                strExpression = CalculateExpress(strExpression).ToString();

            }

            return strExpression;

        }



        private string GetExpType(string strExpression)

        {

            strExpression = strExpression.ToUpper();

            if (strExpression.IndexOf("SIN") != -1)

            {

                return CalculateExExpress(strExpression.Substring(strExpression.IndexOf("N") + 1, strExpression.Length - 1 - strExpression.IndexOf("N")), EnumFormula.Sin).ToString();

            }

            if (strExpression.IndexOf("COS") != -1)

            {

                return CalculateExExpress(strExpression.Substring(strExpression.IndexOf("S") + 1, strExpression.Length - 1 - strExpression.IndexOf("S")), EnumFormula.Cos).ToString();

            }

            if (strExpression.IndexOf("TAN") != -1)

            {

                return CalculateExExpress(strExpression.Substring(strExpression.IndexOf("N") + 1, strExpression.Length - 1 - strExpression.IndexOf("N")), EnumFormula.Tan).ToString();

            }

            if (strExpression.IndexOf("ATAN") != -1)

            {

                return CalculateExExpress(strExpression.Substring(strExpression.IndexOf("N") + 1, strExpression.Length - 1 - strExpression.IndexOf("N")), EnumFormula.ATan).ToString();

            }

            if (strExpression.IndexOf("SQRT") != -1)

            {

                return CalculateExExpress(strExpression.Substring(strExpression.IndexOf("T") + 1, strExpression.Length - 1 - strExpression.IndexOf("T")), EnumFormula.Sqrt).ToString();

            }

            if (strExpression.IndexOf("POW") != -1)

            {

                return CalculateExExpress(strExpression.Substring(strExpression.IndexOf("W") + 1, strExpression.Length - 1 - strExpression.IndexOf("W")), EnumFormula.Pow).ToString();

            }

            return strExpression;

        }

    }

}