JLH/JLHHJSvr/Helper/CalculateHepler.cs

using CSUST.Data.Expr;
using JLHHJSvr.BLL;
using JLHHJSvr.LJException;
using JLHHJSvr.LJFramework.Tools;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;

namespace JLHHJSvr.Helper
{
    internal class CalculateHepler : HelperBase
    {
        public static string ConvertToEnglishSymbols(string input) 
        {
            input = input.Replace("（", "(")
                 .Replace("）", ")")
                 .Replace("，", ",")
                 .Replace("。", ".")
                 .Replace("：", ":")
                 .Replace("；", ";")
                 .Replace("“", "\"")
                 .Replace("”", "\"")
                 .Replace("‘", "'")
                 .Replace("’", "'");

            return input;
        }
        private TData CalculateVarFormula(string varname)
        {
            varname = $"【{varname}】";
            if (!formula_replacements.ContainsKey(varname)) return null;
            return Calculate(varname);
        }
        private void FormatExpression(ref string expression)
        {
            ConvertToEnglishSymbols(expression);

            // 定义正则表达式模式，匹配包含【】的内容
            string pattern = @"【(.*?)】";

            // 创建正则表达式对象
            Regex regex = new Regex(pattern);

            foreach (var replacement in formula_replacements)
            {
                expression = expression.Replace(replacement.Key, replacement.Value);
            }

            // 使用正则表达式匹配输入字符串
            MatchCollection matches = regex.Matches(expression);

            var new_replacements = new Dictionary<string, object>();

            foreach (Match match in matches)
            {
                if (replacements.TryGetValue(match.Value, out object value2))
                {
                    new_replacements[match.Value] = value2;
                }
            }

            foreach (var replacement in new_replacements)
            {
                expression = expression.Replace(replacement.Key, Convert.ToString(replacement.Value));
            }
        }
        private TData Calculate(string expression, string name = "")
        {
            FormatExpression(ref expression);

            try
            {
                return LJExprParser.Parse(expression).Result;
            }
            catch (Exception ex)
            {
                throw new LJCommonException($"计算{name}公式错误!expression: {expression},exception: {ex.Message}");
            }
        }

        private object SqlCalculate(string expression, string name = "")
        {
            FormatExpression(ref expression);

            try
            {
                cmd.CommandText = $@"{expression}";
                cmd.Parameters.Clear();
                return cmd.ExecuteScalar();
            }
            catch (Exception ex)
            {
                throw new LJCommonException($"计算{name}公式错误!expression: {expression},exception: {ex.Message}");
            }
        }
    }
}