/// <summary>
/// Create an equation from the interface type.
/// Does not save the equation.
/// </summary>
public Equation CreateEquation(RestEquation restEquation)
{
// Define regex for looking up ref(0) expressions
var referenceRegEx = new Regex(@"Ref\((\d+)\)", RegexOptions.IgnoreCase);
var referenceMatches = referenceRegEx.Matches(restEquation.Equation);
// Foreach match, find its index and look that up.
var referenceIds = referenceMatches.Select(refMatch => int.Parse(refMatch.Captures.First().Value.Substring(4).Replace(")", string.Empty)));
var references = referenceIds
.Select(refId => AllEquations.FirstOrDefault(equation => equation.Id == refId))
.Where(reference => reference != null)
.ToList();
// Resolve references, until no more can be added or max depth is reached.
const int maxDepth = 100;
for (var i = 0; i < maxDepth; i++)
{
if (!AddReferences(references))
{
break;
}
}
// Create a new equation using the collected references and parameters
return(new Equation(restEquation.Description, restEquation.Equation, restEquation.Parameters, references));
}
public CreatedResult Create([FromBody] RestEquation equation)
{
var parsed = EquationStore.CreateEquation(equation);
if (!equation.Id.HasValue || equation.Id.Equals(-1))
{
equation.Id = parsed.Id;
EquationStore.AddEquation(parsed);
}
else
{
parsed.Id = equation.Id.Value;
EquationStore.UpdateEquation(parsed);
}
return(Created($"/equations/{parsed.Id}", equation));
}
public object Evaluate([FromBody] RestEquation equation)
{
if (string.IsNullOrWhiteSpace(equation?.Equation))
{
return(new RestEvaluationResult {
Success = true, Value = 0
});
}
try
{
var result = EquationStore.CreateEquation(equation).Evaluate();
return(new RestEvaluationResult {
Success = true, Value = result
});
}
catch
{
return(new RestEvaluationResult {
Success = false
});
}
}