using DynamicExpresso;
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using DynamicExpresso.Exceptions;
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using System.Collections.Generic;
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using System.Linq;
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namespace IStation.DynamicExpresso
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{
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/// <summary>
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/// 计算器
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/// </summary>
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public class Calculator
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{
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/// <summary>
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/// 计算
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/// </summary>
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/// <param name="expression">计算表达式</param>
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/// <param name="dict">变量与值对应字典</param>
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/// <returns></returns>
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public static double Eval(string expression, Dictionary<string, double> dict)
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{
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Interpreter interpreter = new Interpreter();
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if (dict != null && dict.Count > 0)
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{
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foreach (var item in dict)
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{
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if (!string.IsNullOrEmpty(item.Key))
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{
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interpreter.SetVariable(item.Key, item.Value);
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}
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}
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}
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return interpreter.Eval<double>(expression);
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}
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/// <summary>
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/// 计算
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/// </summary>
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/// <param name="expression">计算表达式</param>
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/// <param name="arg">变量</param>
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/// <param name="value">值</param>
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/// <returns></returns>
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public static double Eval(string expression, string arg, double value)
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{
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Interpreter interpreter = new Interpreter();
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if (!string.IsNullOrEmpty(arg))
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{
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interpreter.SetVariable(arg, value);
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}
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return interpreter.Eval<double>(expression);
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}
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/// <summary>
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/// 计算（包含【0，1】个变量）
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/// </summary>
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/// <param name="expression">计算表达式</param>
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/// <param name="value">参数</param>
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/// <returns></returns>
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public static double Eval(string expression, double value)
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{
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Interpreter interpreter = new Interpreter();
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var args = interpreter.DetectIdentifiers(expression).UnknownIdentifiers;
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if (args.Count() > 1)
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{
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throw new UnknownIdentifierException(args.Last(), args.Count() - 1);
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}
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if (args.Count() == 1)
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{
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interpreter.SetVariable(args.First(), value);
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}
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return interpreter.Eval<double>(expression);
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}
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}
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}
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