public static string GetMemberName <T>(Sle.Expression <Func <T, object> > expr)
{
Sle.Expression body = ((Sle.LambdaExpression)expr).Body;
Sle.MemberExpression memberExpression = body as Sle.MemberExpression;
if (memberExpression == null)
{
memberExpression = (Sle.MemberExpression)((Sle.UnaryExpression)body).Operand;
}
return(memberExpression.Member.Name);
}
/// <summary>
/// Parse the input and create a function.
/// </summary>
private void Parse()
{
// Build the expression
Sle.Expression expression = GetExpression();
// Ensure we exhausted the input
int finalPosition = Lexer.Position;
Token finalToken = Lexer.Get();
if (finalToken != null)
{
throw new FormatException(string.Format(CultureInfo.InvariantCulture, "Unexpected token {0} at position {1}!", finalToken.TokenType, finalPosition));
}
// Wrap the expression in a function
Sle.Expression <Func <double, double> > functionExpression =
Sle.Expression.Lambda <Func <double, double> >(
expression,
Parameter ?? Sle.Expression.Parameter(typeof(double), "x"));
// Compile the expression into a function
Function = functionExpression.Compile();
}
