/// <summary>
/// 批量添加表达式上下文变量
/// </summary>
/// <param name="variables"></param>
public static void AddVaribles(Collection <Variable> variables)
{
//获取上下文的变量，设置到脚本执行器中
if (variables != null && variables.Count > 0)
{
foreach (Variable var in variables)
{
//添加变来到脚本变量容器
VariableContainer.AddVariable(var);
}
}
}
/// <summary>
/// 根据流程上下文，执行公式语言
/// </summary>
/// <param name="expression"></param>
/// <param name="variables"></param>
/// <returns></returns>
public static object Evaluate(string expression, ICollection <Variable> variables)
{
if (expression == null)
{
return(null);
}
ExpressionExecutor ee = new ExpressionExecutor();
try
{
//获取上下文的变量，设置到脚本执行器中
if (variables != null && variables.Count > 0)
{
foreach (Variable var in variables)
{
//添加变来到脚本变量容器
VariableContainer.AddVariable(var);
}
}
//解析表达式词元
List <ExpressionToken> expTokens = ee.Analyze(expression);
//转化RPN，并验证
expTokens = ee.Compile(expTokens);
//执行RPN
Constant constant = ee.Execute(expTokens);
return(constant.GetObjectValue());
}
catch (IllegalExpressionException e)
{
throw new Exception("表达式：\"" + expression + "\" 执行异常", e);
}
finally
{
//释放脚本变量容器
VariableContainer.RemoveVariableDict();
}
}
/// <summary>
/// 验证表达式
/// </summary>
/// <param name="expression"></param>
/// <param name="variables"></param>
/// <returns></returns>
public static string Compile(string expression, ICollection <Variable> variables)
{
if (expression == null)
{
throw new ArgumentException("表达式为空");
}
ExpressionExecutor ee = new ExpressionExecutor();
try
{
//获取上下文的变量，设置到脚本执行器中
if (variables != null && variables.Count > 0)
{
foreach (Variable var in variables)
{
//添加变量到脚本变量容器
VariableContainer.AddVariable(var);
}
}
//解析表达式词元
List <ExpressionToken> expTokens = ee.Analyze(expression);
//转化RPN，并验证
expTokens = ee.Compile(expTokens);
//以字符串形式输出RPN
return(ee.TokensToString(expTokens));
}
catch (IllegalExpressionException e)
{
throw new Exception("表达式：\"" + expression + "\" 编译期检查异常", e);
}
finally
{
//释放脚本变量容器
VariableContainer.RemoveVariableDict();
}
}
/// <summary>
/// 逐个添加表达式上下文变量
/// </summary>
/// <param name="variable"></param>
public static void AddVarible(Variable variable)
{
//添加变来到脚本变量容器
VariableContainer.AddVariable(variable);
}