/// <summary>
/// 执行实际的运算操作
/// </summary>
/// <param name="polish">要计算的逆波兰式</param>
/// <param name="calcList">逆波兰计算项向量</param>
/// <returns>逆波兰式折叠结果</returns>
private static object HandleEval(string polish, List <PolishItem> calcList)
{
if (calcList.Count == 0)
{
return(null);
}
var calcStack = new Stack <PolishItem>();
foreach (PolishItem poi in calcList)
{
// 操作数压栈
if (poi.ItemType < PolishItemType.CAL_PLUS)
{
calcStack.Push(poi);
continue;
}
// 下面开始是运算符
if (poi.ItemType == PolishItemType.CAL_NOT && calcStack.Count >= 1)
{
PolishItem peeker = calcStack.Peek();
switch (peeker.ItemType)
{
case PolishItemType.CONSTANT:
case PolishItemType.VAR_NUM:
{
calcStack.Pop();
double notres = Math.Abs(peeker.Number) < 1e-15 ? 1.0 : 0.0;
PolishItem np = new PolishItem()
{
Number = notres,
Reference = notres
};
calcStack.Push(np);
continue;
}
case PolishItemType.STRING:
case PolishItemType.VAR_STRING:
{
calcStack.Pop();
double notres = peeker.Cluster == String.Empty ? 1.0 : 0.0;
PolishItem np = new PolishItem()
{
Number = notres,
Reference = notres
};
calcStack.Push(np);
continue;
}
}
}
if (calcStack.Count >= 2)
{
PolishItem operand2 = calcStack.Pop();
PolishItem operand1 = calcStack.Pop();
if (PolishItem.IsOperatable(operand1, operand2, poi))
{
PolishItem newPoi;
double tempDouble;
switch (poi.ItemType)
{
case PolishItemType.CAL_PLUS:
if (operand1.Reference is string || operand2.Reference is string)
{
var tempString = Convert.ToString(operand1.Reference) + Convert.ToString(operand2.Reference);
newPoi = new PolishItem()
{
Cluster = tempString,
Reference = tempString
};
calcStack.Push(newPoi);
}
else
{
tempDouble = Convert.ToDouble(operand1.Reference) + Convert.ToDouble(operand2.Reference);
newPoi = new PolishItem()
{
Number = tempDouble,
Reference = tempDouble
};
calcStack.Push(newPoi);
}
break;
case PolishItemType.CAL_MINUS:
if (operand1.Reference is ValueType)
{
tempDouble = Convert.ToDouble(operand1.Reference) - Convert.ToDouble(operand2.Reference);
newPoi = new PolishItem()
{
Number = tempDouble,
Reference = tempDouble
};
calcStack.Push(newPoi);
}
else
{
throw new Exception("字符串异常操作：减法");
}
break;
case PolishItemType.CAL_MULTI:
if (operand1.Reference is ValueType)
{
tempDouble = Convert.ToDouble(operand1.Reference) * Convert.ToDouble(operand2.Reference);
newPoi = new PolishItem()
{
Number = tempDouble,
Reference = tempDouble
};
calcStack.Push(newPoi);
}
else
{
throw new Exception("字符串异常操作：乘法");
}
break;
case PolishItemType.CAL_DIV:
if (operand1.Reference is ValueType)
{
if (Math.Abs((double)operand2.Reference) < 0)
{
throw new Exception("除零错误");
}
tempDouble = Convert.ToDouble(operand1.Reference) / Convert.ToDouble(operand2.Reference);
newPoi = new PolishItem()
{
Number = tempDouble,
Reference = tempDouble
};
calcStack.Push(newPoi);
}
else
{
throw new Exception("字符串异常操作：除法");
}
break;
case PolishItemType.CAL_ANDAND:
if (operand1.Reference is ValueType)
{
tempDouble = (Math.Abs(Convert.ToDouble(operand1.Reference)) > 0 && Math.Abs(Convert.ToDouble(operand2.Reference)) > 0) ? 1 : 0;
newPoi = new PolishItem()
{
Number = tempDouble,
Reference = tempDouble
};
calcStack.Push(newPoi);
}
else
{
throw new Exception("字符串异常操作：&&");
}
break;
case PolishItemType.CAL_OROR:
if (operand1.Reference is ValueType)
{
tempDouble = (Math.Abs(Convert.ToDouble(operand1.Reference)) > 0 || Math.Abs(Convert.ToDouble(operand2.Reference)) > 0) ? 1 : 0;
newPoi = new PolishItem()
{
Number = tempDouble,
Reference = tempDouble
};
calcStack.Push(newPoi);
}
else
{
throw new Exception("字符串异常操作：||");
}
break;
case PolishItemType.CAL_EQUAL:
if (operand1.Reference is ValueType)
{
tempDouble = Convert.ToDouble(operand1.Reference) == Convert.ToDouble(operand2.Reference) ? 1 : 0;
newPoi = new PolishItem()
{
Number = tempDouble,
Reference = tempDouble
};
calcStack.Push(newPoi);
}
else
{
tempDouble = (string)operand1.Reference == (string)operand2.Reference ? 1 : 0;
newPoi = new PolishItem()
{
Number = tempDouble,
Reference = tempDouble
};
calcStack.Push(newPoi);
}
break;
case PolishItemType.CAL_NOTEQUAL:
if (operand1.Reference is ValueType)
{
tempDouble = Convert.ToDouble(operand1.Reference) != Convert.ToDouble(operand2.Reference) ? 1 : 0;
newPoi = new PolishItem()
{
Number = tempDouble,
Reference = tempDouble
};
calcStack.Push(newPoi);
}
else
{
tempDouble = (string)operand1.Reference != (string)operand2.Reference ? 1 : 0;
newPoi = new PolishItem()
{
Number = tempDouble,
Reference = tempDouble
};
calcStack.Push(newPoi);
}
break;
case PolishItemType.CAL_BIG:
if (operand1.Reference is ValueType)
{
tempDouble = Convert.ToDouble(operand1.Reference) > Convert.ToDouble(operand2.Reference) ? 1 : 0;
newPoi = new PolishItem()
{
Number = tempDouble,
Reference = tempDouble
};
calcStack.Push(newPoi);
}
else
{
tempDouble = String.Compare((string)operand1.Reference, (string)operand2.Reference) > 0 ? 1 : 0;
newPoi = new PolishItem()
{
Number = tempDouble,
Reference = tempDouble
};
calcStack.Push(newPoi);
}
break;
case PolishItemType.CAL_BIGEQUAL:
if (operand1.Reference is ValueType)
{
tempDouble = Convert.ToDouble(operand1.Reference) >= Convert.ToDouble(operand2.Reference) ? 1 : 0;
newPoi = new PolishItem()
{
Number = tempDouble,
Reference = tempDouble
};
calcStack.Push(newPoi);
}
else
{
tempDouble = String.Compare((string)operand1.Reference, (string)operand2.Reference) >= 0 ? 1 : 0;
newPoi = new PolishItem()
{
Number = tempDouble,
Reference = tempDouble
};
calcStack.Push(newPoi);
}
break;
case PolishItemType.CAL_SMALL:
if (operand1.Reference is ValueType)
{
tempDouble = Convert.ToDouble(operand1.Reference) < Convert.ToDouble(operand2.Reference) ? 1 : 0;
newPoi = new PolishItem()
{
Number = tempDouble,
Reference = tempDouble
};
calcStack.Push(newPoi);
}
else
{
tempDouble = String.Compare((string)operand1.Reference, (string)operand2.Reference) < 0 ? 1 : 0;
newPoi = new PolishItem()
{
Number = tempDouble,
Reference = tempDouble
};
calcStack.Push(newPoi);
}
break;
case PolishItemType.CAL_SMALLEQUAL:
if (operand1.Reference is ValueType)
{
tempDouble = Convert.ToDouble(operand1.Reference) <= Convert.ToDouble(operand2.Reference) ? 1 : 0;
newPoi = new PolishItem()
{
Number = tempDouble,
Reference = tempDouble
};
calcStack.Push(newPoi);
}
else
{
tempDouble = String.Compare((string)operand1.Reference, (string)operand2.Reference) <= 0 ? 1 : 0;
newPoi = new PolishItem()
{
Number = tempDouble,
Reference = tempDouble
};
calcStack.Push(newPoi);
}
break;
default:
break;
}
}
}
}
if (calcStack.Count != 1)
{
Utils.LogUtils.LogLine("求值器无法计算逆波兰式：" + polish, "PolishEvaluator", Utils.LogLevel.Error);
throw new Exception("表达式有错误");
}
return(calcStack.Peek().Reference);
}
/// <summary>
/// 将逆波兰式转化为可计算的项
/// </summary>
/// <param name="polish">逆波兰式字符串</param>
/// <param name="vsm">关于哪个调用堆栈做动作</param>
/// <returns>可计算项目向量</returns>
private static List <PolishItem> GetPolishItemList(string polish, StackMachine vsm, EvaluatableContext ctx)
{
var resVec = new List <PolishItem>();
var polishItem = polish.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
foreach (string item in polishItem)
{
PolishItem poi = null;
Regex floatRegEx = new Regex(@"^(\-|\+)?\d+(\.\d+)?$");
// 常数项
if (floatRegEx.IsMatch(item))
{
double numitem = Convert.ToDouble(item);
poi = new PolishItem()
{
Number = numitem,
Cluster = null,
ItemType = PolishItemType.CONSTANT,
Reference = numitem
};
}
// 字符串
else if (item.StartsWith("\"") && item.EndsWith("\""))
{
string trimItem = item.Substring(1, item.Length - 2);
poi = new PolishItem()
{
Number = 0.0f,
Cluster = trimItem,
ItemType = PolishItemType.STRING,
Reference = trimItem
};
}
// 变量时
else if ((item.StartsWith("&") || item.StartsWith("$") || item.StartsWith("%")) && item.Length > 1)
{
object varRef = ctx != null?ctx.Fetch(item.Substring(1)) : Director.RunMana.Fetch(item, vsm);
if (varRef is ValueType)
{
poi = new PolishItem()
{
Number = Convert.ToDouble(varRef),
Cluster = null,
ItemType = PolishItemType.VAR_NUM,
Reference = varRef
};
}
else
{
poi = new PolishItem()
{
Number = 0.0f,
Cluster = Convert.ToString(varRef),
ItemType = PolishItemType.VAR_STRING,
Reference = varRef
};
}
}
else
{
switch (item)
{
case "+":
poi = new PolishItem()
{
Number = 0.0f,
Cluster = null,
ItemType = PolishItemType.CAL_PLUS,
Reference = null
};
break;
case "-":
poi = new PolishItem()
{
Number = 0.0f,
Cluster = null,
ItemType = PolishItemType.CAL_MINUS,
Reference = null
};
break;
case "*":
poi = new PolishItem()
{
Number = 0.0f,
Cluster = null,
ItemType = PolishItemType.CAL_MULTI,
Reference = null
};
break;
case "/":
poi = new PolishItem()
{
Number = 0.0f,
Cluster = null,
ItemType = PolishItemType.CAL_DIV,
Reference = null
};
break;
case "!":
poi = new PolishItem()
{
Number = 0.0f,
Cluster = null,
ItemType = PolishItemType.CAL_NOT,
Reference = null
};
break;
case "&&":
poi = new PolishItem()
{
Number = 0.0f,
Cluster = null,
ItemType = PolishItemType.CAL_ANDAND,
Reference = null
};
break;
case "||":
poi = new PolishItem()
{
Number = 0.0f,
Cluster = null,
ItemType = PolishItemType.CAL_OROR,
Reference = null
};
break;
case "<>":
poi = new PolishItem()
{
Number = 0.0f,
Cluster = null,
ItemType = PolishItemType.CAL_NOTEQUAL,
Reference = null
};
break;
case "==":
poi = new PolishItem()
{
Number = 0.0f,
Cluster = null,
ItemType = PolishItemType.CAL_EQUAL,
Reference = null
};
break;
case ">":
poi = new PolishItem()
{
Number = 0.0f,
Cluster = null,
ItemType = PolishItemType.CAL_BIG,
Reference = null
};
break;
case "<":
poi = new PolishItem()
{
Number = 0.0f,
Cluster = null,
ItemType = PolishItemType.CAL_SMALL,
Reference = null
};
break;
case ">=":
poi = new PolishItem()
{
Number = 0.0f,
Cluster = null,
ItemType = PolishItemType.CAL_BIGEQUAL,
Reference = null
};
break;
case "<=":
poi = new PolishItem()
{
Number = 0.0f,
Cluster = null,
ItemType = PolishItemType.CAL_SMALLEQUAL,
Reference = null
};
break;
}
}
if (poi != null)
{
resVec.Add(poi);
}
}
return(resVec);
}