/// <summary>
/// Takes an expression or value and evaluates it.
/// </summary>
/// <param name="expr">The expression or value to evaluate.</param>
/// <returns>The value represented by the expression or value.</returns>
/// <exception cref="Exception">Throws when a variable is undefined or the expression is unhandled.</exception>
public virtual IValue Run(IValueExpressible expr)
{
switch (expr)
{
case ScalarVar s:
return(Scope[s] ?? throw new Exception($"Scalar {s.Value} not found"));
case ListVar l:
return(Scope[l] ?? throw new Exception($"List {l.Value} not found"));
case ValueExpression e:
return(Builtins[""].Invoke(this, e));
case IValue i:
return(i);
default:
throw new Exception($"Unexpected expression type {expr.GetType()}");
}
}
public ValueExpression(IValueExpressible value)
{
Values = new[] { value };
IsValue = true;
}
