CodingSeb.ExpressionEvaluator Options

The CodingSeb.ExpressionEvaluator provides various options that can modify the way the evaluation is performed.

Case Sensitive Evaluation

The code evaluation is case-sensitive by default. Let's way you want to evaluate the following different expressions.

public static void Example1()
{
    ExpressionEvaluator evaluator = new ExpressionEvaluator();

    List<string> expressions = new List<string>()
    {
        "ABS(-3.2d);",
        "acos(-0.5d);",
        "avg(1, 2.5, -4, 6.2);",
        "Floor(4.23d);",
        "IeeeRemainder(9, 8);",
        "log10(1000d);",
    };

    foreach (var expr in expressions)
    {
        try
        {
            var result = evaluator.ScriptEvaluate(expr);
            Console.WriteLine($"{expr}\t {result}\n");
        }
        catch (Exception e)
        {
            Console.WriteLine(e.Message);
        }
    }
}

When you execute the above code, you will get the exceptions for those expressions which are not in the camel case.

Function [ABS] unknown in expression : [ABS(-3.2d)]
Function [acos] unknown in expression : [acos(-0.5d)]
Function [avg] unknown in expression : [avg(1, 2.5, -4, 6.2)]
Floor(4.23d);    4

Function [IeeeRemainder] unknown in expression : [IeeeRemainder(9, 8)]
Function [log10] unknown in expression : [log10(1000d)]

Now to make the code evaluation case insensitive, we need to set the evaluator.OptionCaseSensitiveEvaluationActive = false

public static void Example2()
{
    ExpressionEvaluator evaluator = new ExpressionEvaluator();
    evaluator.OptionCaseSensitiveEvaluationActive = false;

    List<string> expressions = new List<string>()
    {
        "ABS(-3.2d);",
        "acos(-0.5d);",
        "avg(1, 2.5, -4, 6.2);",
        "Floor(4.23d);",
        "IeeeRemainder(9, 8);",
        "log10(1000d);",
    };

    foreach (var expr in expressions)
    {
        try
        {
            var result = evaluator.ScriptEvaluate(expr);
            Console.WriteLine($"{expr}\t {result}\n");
        }
        catch (Exception e)
        {
            Console.WriteLine(e.Message);
        }
    }
}

Let's execute the above code, and you will see the following output.

ABS(-3.2d);      3.2

acos(-0.5d);     2.0943951023931957

avg(1, 2.5, -4, 6.2);    1.425

Floor(4.23d);    4

IeeeRemainder(9, 8);     1

log10(1000d);    3

Evaluate Integer Numbers As Double

By default, integers values without decimal or suffixes are evaluated as int as in C#. Let's consider the following simple expression 50/15 for evaluation.

public static void Example3()
{
    string expression = "50/15";
    ExpressionEvaluator evaluator = new ExpressionEvaluator();
    Console.WriteLine(evaluator.Evaluate(expression));
}

Let's execute the above code, and you will see the following output.

3

Now to evaluate integer as double, we need to set the evaluator.OptionForceIntegerNumbersEvaluationsAsDoubleByDefault = true;

public static void Example4()
{
    string expression = "50/15";
    ExpressionEvaluator evaluator = new ExpressionEvaluator();
    evaluator.OptionForceIntegerNumbersEvaluationsAsDoubleByDefault = true;

    Console.WriteLine(evaluator.Evaluate(expression));
}

Let's execute the above code, and you will see the following output.

3.3333333333333335