DarkKitsune/DrakeScript

.NET Scripting Engine

DrakeScript

DrakeScript is an embedded scripting language for .NET applications.

Usage examples:

Hello world

var context = new Context();
var testScript = context.LoadString(
    @"PrintLn(""Hello, world!"");"
);
testScript.Invoke();

Simple function

var context = new Context();
var testScript = context.LoadString(
    @"let function add3(a, b, c)
    {
        return a + b + c;
    }

    return add3(1, 2, 6);"
);
var result = testScript.Invoke();
Console.WriteLine(result);

Sum of array elements that are numbers

var context = new Context();
var testScript = context.LoadString(
    @"let function arraySum(array)
    {
        let sum = 0;
        let i = 0;
        loop (lengthof array)
        {
            let e = array[i];
            if (e is Number)
            {
                sum += e;
            }
            i += 1;
        }
        return sum;
    }

    return arraySum([24, 53, 1, 9, ""foo"", nil]);"
);
var result = testScript.Invoke();
Console.WriteLine(result);

Sum of array elements that are numbers (then-otherwise version)

var context = new Context();
var testScript = context.LoadString(
    @"let function arraySum(array)
    {
        let sum = 0;
        let i = 0;
        loop (lengthof array)
        {
            let e = array[i];
            sum += e is Number then e otherwise 0;
            i += 1;
        }
        return sum;
    }

    return arraySum([24, 53, 1, 9, ""foo"", nil]);"
);
var result = testScript.Invoke();
Console.WriteLine(result);

Setting global variable from host application

var context = new Context();
context.SetGlobal("Foo", 5.1);
var testScript = context.LoadString(
    @"PrintLn2(Foo);"
);
testScript.Invoke();

Registering global function from host application

var context = new Context();
context.SetGlobal(
    "PrintLn2", context.CreateFunction(
        (interpreter, location, args, argCount) =>
        {
            for (var i = 0; i < argCount; i++)
            {
                Console.Write(args[i].ToString());
            }
            Console.WriteLine();
            return Value.Nil;
        },
        1 // *MINUMUM* argument count required
    )
);
var testScript = context.LoadString(
    @"PrintLn2(1, 2, 3);"
);
testScript.Invoke();

Creating table

var context = new Context();
var testScript = context.LoadString(
    @"let tableKey = { 1 => [2, 4] };
    PrintLn(
        {
            ""foo"" => ""bar"",
            ""hello"" => 4,
            89.2 => 2,
            tableKey => 2
        }
    );"
);
testScript.Invoke();