public async Task <object> Calcualte(ExpressionCalculator calculator, string expression, object executeContext)
{
if (string.IsNullOrEmpty(expression))
{
var fragment = new TextFragment()
{
Code = TextCodes.ExpressionEmptyInExpressionCalculatorByName,
DefaultFormatting = "在名称为{0}的表达式计算器中，要计算的表达式为空",
ReplaceParameters = new List <object>()
{
calculator.Name
}
};
throw new UtilityException((int)Errors.ExpressionEmptyInExpressionCalculatorByName, fragment);
}
//公式的正则表达式
Regex reg = new Regex(@"\{(?<!\\)\$[A-Za-z0-9]((?!(\{(?<!\\)\$[A-Za-z0-9][A-Za-z0-9_]+\(.*\)(?<!\\)\})).)+?(?<!\\)\}");
//公式参数_ref的正则表达式
Regex regRefExpression = new Regex(@"(?<!\\)\$_ref\((.*)\)");
///公式参数_ref的参数的正则表达式
//Regex regRefParameterExpression = new Regex(@"(?<=\$_ref\().*(?=\))");
ConcurrentDictionary <string, object> dictValues = new ConcurrentDictionary <string, object>();
while (true)
{
//通过正则表达式获取公式参数
var matchs = reg.Matches(expression);
int length = matchs.Count;
if (length == 0)
{
break;
}
var matchList = matchs.Cast <Match>();
ConcurrentDictionary <int, string> dictResult = new ConcurrentDictionary <int, string>();
Dictionary <string, Semaphore> lockObjs = new Dictionary <string, Semaphore>();
if (calculator.FormulaExecuteParallelism > 1)
{
//生成锁定对象集
foreach (var item in matchList)
{
lockObjs[item.Value] = new Semaphore(1, 1);
}
}
//设定并行计算
await ParallelHelper.ForEach <Match>(matchList, calculator.FormulaExecuteParallelism, async (match) =>
{
//获取公式
var formula = getFormulaCalculator(calculator, match.Value);
var formulaService = getFormulaCalculateService(calculator.Name, formula.Name);
//检查公式参数，如果参数格式为$_ref(XXX),则值从dictValues中获取，
//如果为一般字符串，则需调用对应公式服务的ParameterConvert方法来获取实际值
List <object> formulaParameters = new List <object>();
for (var index = 0; index <= formula.ParameterExpressions.Count - 1; index++)
{
var peMatch = regRefExpression.Match(formula.ParameterExpressions[index]);
if (peMatch.Success)
{
if (!dictValues.TryGetValue(peMatch.Groups[1].Value, out object pValue))
{
var fragment = new TextFragment()
{
Code = TextCodes.NotFoundValueInExpressionStoreValues,
DefaultFormatting = "在名称为{0}的表达式计算器中，找不到键为{1}的值，表达式为{2}",
ReplaceParameters = new List <object>()
{
calculator.Name, peMatch.Groups[1].Value, peMatch.Value
}
};
throw new UtilityException((int)Errors.NotFoundValueInExpressionStoreValues, fragment);
}
formulaParameters.Add(pValue);
}
else
{
formulaParameters.Add(await formulaService.ParameterConvert(index, formula.ParameterExpressions[index].Replace(@"\}", "}").Replace(@"\$", "$").Replace(@"\,", ",").Replace(@"\\", @"\")));
}
}
//判断是否可重复使用
//如果可重复使用，则通过公式名称存储
//如果不可重复使用，则通过guid作为名称存储
if (await formulaService.IsIndividual())
{
if (!dictValues.TryGetValue(formula.Name, out object value))
{
try
{
if (calculator.FormulaExecuteParallelism > 1)
{
lockObjs[match.Value].WaitOne();
}
if (!dictValues.TryGetValue(formula.Name, out value))
{
//计算公式
var formulaValue = await formulaService.Calculate(formulaParameters, executeContext);
dictValues[formula.Name] = formulaValue;
}
}
finally
{
if (calculator.FormulaExecuteParallelism > 1)
{
lockObjs[match.Value].Release();
}
}
}
dictResult[match.Index] = string.Format(@"$_ref({0})", formula.Name);
}
else
{
//计算公式
var formulaValue = await formulaService.Calculate(formulaParameters, executeContext);
string calculatedFormulaName = Guid.NewGuid().ToString();
dictValues[calculatedFormulaName] = formulaValue;
dictResult[match.Index] = string.Format(@"$_ref({0})", calculatedFormulaName);
}
});
//为每个匹配项做替换
expression = reg.Replace(expression, (match) =>
{
if (dictResult.TryGetValue(match.Index, out string matchResult))
{
return(matchResult);
}
else
{
return(match.Value);
}
});
}
//content = content.Replace(@"\}", "}").Replace(@"\$", "$").Replace(@"\,", ",").Replace(@"\\", @"\");
var lastMatch = regRefExpression.Match(expression);
if (!lastMatch.Success)
{
var fragment = new TextFragment()
{
Code = TextCodes.ExpressionFormatError,
DefaultFormatting = "在名称为{0}的表达式计算器中，表达式格式不正确，表达式为{1}",
ReplaceParameters = new List <object>()
{
calculator.Name, expression
}
};
throw new UtilityException((int)Errors.ExpressionFormatError, fragment);
}
if (!dictValues.TryGetValue(lastMatch.Groups[1].Value, out object value))
{
var fragment = new TextFragment()
{
Code = TextCodes.NotFoundValueInExpressionStoreValues,
DefaultFormatting = "在名称为{0}的表达式计算器中，找不到键为{1}的值，表达式为{2}",
ReplaceParameters = new List <object>()
{
calculator.Name, lastMatch.Groups[1].Value, expression
}
};
throw new UtilityException((int)Errors.NotFoundValueInExpressionStoreValues, fragment);
}
return(value);
}
