private object EvaluateExpression(ValueExpression expr, IScriptContext ctx)
{
try
{
return(expr.GetValue(CreateElContext(ctx)));
}
catch (ELException elexp)
{
throw new ScriptException(elexp);
}
}
public virtual object GetValue(IVariableContext variableContext)
{
if (Context.CommandContext == null)
{
throw new ProcessEngineException(
"Expression can only be evaluated inside the context of the process engine");
}
var context = Context.ProcessEngineConfiguration.ExpressionManager.CreateElContext(variableContext);
return(ValueExpression.GetValue(context));
}
public override object Eval(Bindings bindings, ELContext context)
{
ValueExpression expression = bindings.GetVariable(index);
if (expression != null)
{
return(expression.GetValue(context));
}
context.PropertyResolved = false;
object result = context.ELResolver.GetValue(context, null, name);
if (!context.PropertyResolved)
{
throw new PropertyNotFoundException(LocalMessages.Get(string.Format("error.identifier.property.notfound:{0}", name)));
}
return(result);
}
public virtual bool EvaluateSimpleUnaryTests(string simpleUnaryTests, string inputName, IVariableContext variableContext)
{
try
{
ELContext elContext = CreateContext(variableContext);
ValueExpression valueExpression = TransformSimpleUnaryTests(simpleUnaryTests, inputName, elContext);
return((bool)valueExpression.GetValue(elContext));
}
catch (FeelMissingFunctionException e)
{
throw LOG.UnknownFunction(simpleUnaryTests, e);
}
catch (FeelMissingVariableException e)
{
if (inputName.Equals(e.GetVariable()))
{
throw LOG.unableToEvaluateExpressionAsNotInputIsSet(simpleUnaryTests, e);
}
else
{
throw LOG.unknownVariable(simpleUnaryTests, e);
}
}
catch (FeelConvertException e)
{
throw LOG.unableToConvertValue(simpleUnaryTests, e);
}
catch (ELException e)
{
if (e.InnerException is FeelMethodInvocationException)
{
throw LOG.unableToInvokeMethod(simpleUnaryTests, (FeelMethodInvocationException)e.InnerException);
}
else
{
throw LOG.unableToEvaluateExpression(simpleUnaryTests, e);
}
}
}
/// <summary>
/// 根据初始参数值生成Row，常用来提供给查询面板
/// </summary>
/// <returns></returns>
public Row BuildInitRow()
{
var data = new Row();
foreach (var row in Data)
{
string name = row.Str("name");
if (name == "")
{
continue;
}
string val = row.Str("val");
if (val != "" && val[0] == ':')
{
val = ValueExpression.GetValue(val.Substring(1));
}
switch (row.Str("type").ToLower())
{
case "bool":
if (val == "")
{
data.AddCell <bool>(name);
}
else
{
string l = val.ToLower();
data.AddCell(name, (l == "1" || l == "true"));
}
break;
case "double":
if (val != "" && double.TryParse(val, out var v))
{
data.AddCell(name, v);
}
else
{
data.AddCell <double>(name);
}
break;
case "int":
if (val != "" && int.TryParse(val, out var i))
{
data.AddCell(name, i);
}
else
{
data.AddCell <int>(name);
}
break;
case "date":
if (val != "" && DateTime.TryParse(val, out var d))
{
data.AddCell(name, d);
}
else
{
data.AddCell <DateTime>(name);
}
break;
default:
data.AddCell(name, val);
break;
}
}
return(data);
}
/// <summary>
/// 根据初始参数值生成查询参数字典
/// </summary>
/// <returns></returns>
public Dict BuildInitDict()
{
Dict dict = new Dict();
foreach (var row in Data)
{
string name = row.Str("name");
if (name == "")
{
continue;
}
string val = row.Str("val");
if (val != "" && val[0] == ':')
{
val = ValueExpression.GetValue(val.Substring(1));
}
switch (row.Str("type").ToLower())
{
case "bool":
if (val == "")
{
dict[name] = false;
}
else
{
string l = val.ToLower();
dict[name] = (l == "1" || l == "true");
}
break;
case "double":
if (val != "" && double.TryParse(val, out var v))
{
dict[name] = v;
}
else
{
dict[name] = default(double);
}
break;
case "int":
if (val != "" && int.TryParse(val, out var i))
{
dict[name] = i;
}
else
{
dict[name] = default(int);
}
break;
case "date":
if (val != "" && DateTime.TryParse(val, out var d))
{
dict[name] = d;
}
else
{
dict[name] = default(DateTime);
}
break;
default:
dict[name] = val;
break;
}
}
return(dict);
}
protected override string VisitMemberExpression(MemberExpression memberExpression) => IsMemberExpressionBelongsResource(memberExpression) ? base.VisitMemberExpression(memberExpression) : _valueExpression.GetValue(memberExpression).ToQuery();
protected internal override void Invoke()
{
InvocationResult = _valueExpression.GetValue(_elContext);
}
public Object GetValue(IVariableContext variableContext)
{
ELContext elContext = elContextFactory.CreateElContext(variableContext);
return(expression.GetValue(elContext));
}
