private Parameter NonSituationalEvaluate(out IDynamicExpression e)
{
try
{
e = _context.CompileDynamic(_formula.Functions[0].Expression);
var result = e.Evaluate().Infer();
Parameter parameter;
parameter = new Parameter(_formula.Name, result.Infer(), null, ref _model);
parameter.IsCalculated = true;
_parameters.Add(parameter);
if (_context.Variables.ContainsKey(parameter.Name))
{
_context.Variables.Remove(parameter.Name);
}
_context.Variables.Add(parameter.Name, parameter.Value.Infer());
return(parameter);
}
catch (ExpressionCompileException)
{
// Function can not evaluate further, before a Question/Answer sequence is fullfilled by the client.
throw new UnresolvedException($"Function {_formula.Functions[0].Expression} can not evaluate further, before a Question/Answer sequence is fullfilled by the client.");
}
}
public ParametersCollection GetFunctionTree(YamlScriptController controller, string expression = null)
{
localContext = new ExpressionContext(controller);
localContext.Options.ParseCulture = CultureInfo.InvariantCulture;
// Allow the expression to use all static public methods of System.Math
localContext.Imports.AddType(typeof(Math));
// Allow the expression to use all static overload public methods our CustomFunctions class
localContext.Imports.AddType(typeof(CustomFunctions));
var variables = new System.Collections.Generic.Dictionary <string, Type>();
var parameters = new ParametersCollection();
localContext.Variables.ResolveVariableType += (object sender, ResolveVariableTypeEventArgs e) =>
{
parameters.Add(new Parameter(e.VariableName, 0, null, ref _model));
variables.Add(e.VariableName, typeof(object));
e.VariableType = typeof(object);
};
if (expression != null)
{
try
{
IGenericExpression <object> eDynamic = localContext.CompileGeneric <object>(expression);
}
catch
{
}
return(parameters);
}
foreach (var formula in _model.Formulas)
{
try
{
IGenericExpression <object> eDynamic = localContext.CompileGeneric <object>(formula.Functions[0].Expression);
}
catch
{
}
}
return(parameters);
}
private static Parameter Evaluate(FormulaExpressionContext caller, ref ExpressionContext context, ref Formula formula, ref ParametersCollection parameters1, QuestionDelegate onQuestion, ref Model.Model model)
{
if (parameters1 is null)
{
throw new ArgumentNullException(nameof(parameters1));
}
IDynamicExpression e = null;
if (!formula.IsSituational)
{
try
{
e = context.CompileDynamic(formula.Functions[0].Expression);
var result = e.Evaluate().Infer();
Parameter parameter;
parameter = new Parameter(formula.Name, result.Infer(), null, ref model);
parameter.IsCalculated = true;
parameters1.Add(parameter);
if (context.Variables.ContainsKey(parameter.Name))
{
context.Variables.Remove(parameter.Name);
}
context.Variables.Add(parameter.Name, parameter.Value.Infer());
return(parameter);
}
catch (ExpressionCompileException)
{
// Function can not evaluate further, before a Question/Answer sequence is fullfilled by the client.
throw new UnresolvedException($"Function {formula.Functions[0].Expression} can not evaluate further, before a Question/Answer sequence is fullfilled by the client.");
}
}
else
{
foreach (var function in formula.Functions)
{
foreach (var item in parameters1)
{
if (item.Name == function.Situation && (bool)item.Value == true)
{
try
{
e = context.CompileDynamic(function.Expression);
var parameter = new Parameter(formula.Name, e.Evaluate().Infer(), null, ref model);
parameter.IsCalculated = true;
parameters1.Add(parameter);
if (context.Variables.ContainsKey(parameter.Name))
{
context.Variables.Remove(parameter.Name);
}
context.Variables.Add(parameter.Name, parameter.Value.Infer());
return(parameter);
}
catch (ExpressionCompileException)
{
// Function can not evaluate further, before a Question/Answer sequence is fullfilled by the client.
throw new UnresolvedException($"Function {function.Expression} can not evaluate further, before a Question/Answer sequence is fullfilled by the client.");
}
}
}
}
StringBuilder situations = new StringBuilder();
var parameters = new ParametersCollection();
foreach (var function in formula.Functions)
{
situations.Append(function.Situation + ",");
var parameter = new Parameter(function.Situation, TypeInference.Infer(function).Type, null, ref model);
parameters.Add(parameter);
}
if (onQuestion == null)
{
throw new Exception($"In order to evaluate variable one of the following situations: {situations.ToString().Trim(',')}, you need to provide a delegate callback to the client for providing an answer");
}
onQuestion(caller, new QuestionArgs("", parameters));
// situation has to be formulated as an input parameter by the client.
throw new UnresolvedException($"Can't evaluate formula {formula.Name} for situation. Please specify one of the following situations: {situations.ToString().Trim(',')}.");
}
}
private Parameter SituationalEvaluate(out IDynamicExpression e)
{
foreach (var function in _formula.Functions)
{
foreach (var item in _parameters)
{
if (item.Name == function.Situation && bool.TryParse(item.Value.ToString(), out bool value) && value)
{
try
{
if (_formula.IsAutoFunc)
{
// do not compile, autofunc is derived from a user choice from step.
e = _context.CompileDynamic(function.Expression);
return(item as Parameter);
}
else
{
e = _context.CompileDynamic(function.Expression);
var parameter = new Parameter(_formula.Name, e.Evaluate().Infer(), null, ref _model);
parameter.IsCalculated = true;
if (_parameters.GetParameter(_formula.Name) != null)
{
// while reclaculating make sure to keep parameters distinct
_parameters.Remove(_parameters.GetParameter(_formula.Name));
}
_parameters.Add(parameter);
if (_context.Variables.ContainsKey(parameter.Name))
{
_context.Variables.Remove(parameter.Name);
}
_context.Variables.Add(parameter.Name, parameter.Value.Infer());
return(parameter);
}
}
catch (ExpressionCompileException ex)
{
// Function can not evaluate further, before a Question/Answer sequence is fullfilled by the client.
throw new UnresolvedException($"Function {function.Expression} can not evaluate further, before a Question/Answer sequence is fullfilled by the client.", ex);
}
}
}
}
StringBuilder situations = new StringBuilder();
var parameters = new ParametersCollection();
foreach (var function in _formula.Functions)
{
situations.Append(function.Situation + ",");
var parameter = new Parameter(function.Situation, null, TypeInference.Infer(function).Type, ref _model);
parameters.Add(parameter);
}
if (OnQuestion == null)
{
throw new Exception($"In order to evaluate variable one of the following situations: {situations.ToString().Trim(',')}, you need to provide a delegate callback to the client for providing an answer");
}
OnQuestion(this, new QuestionArgs("", parameters));
// situation has to be formulated as an input parameter by the client.
throw new UnresolvedException($"Can't evaluate formula {_formula.Name} for situation. Please specify one of the following situations: {situations.ToString().Trim(',')}.");
}