Using Dynamic Languages to Build Scriptable Apps

Dino ViehlandSenior Software Development EngineerMicrosoft

FT30

Why dynamic languages?> Simple enough for non-programmers> Capable enough for programmers

> “Python, like many good technologies, soon spreads virally throughout your development team and finds its way into all sorts of applications and tools…Python scripts are used in many areas of the game.”> Mustafa Thamer, Civilization IV development team

> Let users improve your application> Create an Application Ecosystem

> Users can share scripts, adding value to your apps

> Virtuous cycle> Enable Quick Fixes in the field

Dynamic Languages…

Consumers

Keeping it Simpledef fact(n): if n == 0: return 1 return n * fact(n-1)

print fact(13)

def fact(n)    return 1 if n == 0    n * fact(n-1)end

puts fact(13)

using System;

public class MathClass { public static int Factorial(int n) { if (n == 0) { return 1; } return n * Factorial(n – 1); } public static void Main(string[] args) { Console.WriteLine(Factorial(13)); }}

Dynamic Language Runtime> Infrastructure for creating dynamic

languages> More languages available

> Shared interop protocol> Dynamic languages can talk to each

other> Static languages can talk to dynamic

languages> Lightweight hosting API

> One API, multiple languages> Users can choose the best language

DLR Hosting

ScriptRuntime

ScriptScope ScriptEngine

ScriptSource

Demo - Hosting> Getting Started> Getting Languages> Scopes

> Injecting our object model> Getting delegates back> Working with classes

> Using C# Dynamic> Getting More Dynamic

Downloads…

> IronPython> http://ironpython.codeplex.com

> IronRuby> http://ironruby.net

> DLR> http://dlr.codeplex.com

> Source updated daily

Summary> Scripting Languages can extend

your application> DLR provides common APIs for

multiple languages> DLR enables C# and VB.NET to

seamlessly access

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