Script.NET

<h2 id="metaprogramming-features">Metaprogramming features</h2>
<p>Script.NET has a special quotation operator <[ program ]> which returns the <a href="/facts/Abstract_syntax_tree/73AUK1jI">AST</a> of a given program. Additionally, the AST of the current program may be accessed with the prog object.
</p><p>Here is an example:
</p>
//Create an AST for MessageBox.Show('Hello'); program
ast = <[ MessageBox.Show('Hello'); ]>;
//Add this AST at the end of the current program
prog.AppendAst(ast);

<p>The <[ ... ]> operator and prog objects allow Script.NET to generate new scripts or modify existing scripts at runtime.
</p>
<h2 id="generalized-objects">Generalized objects</h2>
<p>Script.NET includes so-called "Mutantic Framework" which introduces a special kind of "meta" objects for controlling objects of any type. It is composed of a set of classes, on top of which is the "DataMutant" class. It implements several principles of mutant object:
</p>
<h3>Definition</h3>
<p>A Mutant is a special object which could have all properties (fields, methods, etc.), and may be converted to any type (or assigned to object of any type). The semantics of such conversion (or assignment) are pragmatically conditional.
</p><p>There is a special operator := called Mutantic or Generalized assignment. Its purpose is to assign values of DataMutant fields to corresponding fields of an object of any type.
</p><p><i>Example</i>. Creation and Usage of MObject:
</p>
 // Create Data Mutant Object
 mobj = [ Text -> 'Hello from Mutant' ];
 // Set Additional Fields
 mobj{{Not a typo|.}}Top = 0;
 mobj{{Not a typo|.}}Left = 0;
 // Set corresponding fields of Windows Form object
 // (Mutantic Assignment)
 form := mobj;

<h2 id="examples">Examples</h2>
<h3>Hello world</h3>
 MessageBox.Show('Hello World!');

<h3>Bubble sort without output function</h3>
a=[17, 0, 5, 3,1, 2, 55];
for (i=0; i < a.Length; i=i+1)
 for (j=i+1; j <  a.Length; j=j+1)
   if (a[i] > a[j] )
   {
     temp = a[i]; 
     a[i] = a[j];
     a[j] = temp;
   }

s = 'Results:';
for (i=0; i < a.Length; i++)
  s = s + ',' + a[i];

MessageBox.Show(s);

<h3>RSS Reader</h3>
a = new XmlDocument();
a.Load('http://www.codeplex.com/scriptdotnet/Project/ProjectRss.aspx');
 
MessageBox.Show('CodePlex Script.NET RSS::');
foreach (n in a.SelectNodes('/rss/channel/item/title'))
  MessageBox.Show(n.InnerText);

<h3>Stack</h3>
<p>Stack limited to 20 elements using <a href="/facts/Design_by_contract/PjacMRRd">Design by contract</a> feature
</p>
function Push(item)
[
//Limit to 10 items
 pre(me{{Not a typo|.}}Count < 10 ); 
 post();
 invariant();
]
{
 //me is mutated object, 
 //stack in this case
 me.Push(item);
}

function Pop()
[//Check emptiness hardik
 pre(me{{Not a typo|.}}Count > 0);
 post();
 invariant();
]
{
 return me.Pop();
}

stack = new Stack<|int|>();

//Create Mutant hardik
//1. Set Functions, override stack{{Not a typo|.}}Push
mObject=[Push->Push,PopCheck->Pop];
//2. Capture object
mObject.Mutate(stack);

for (i=0; i<5; i++)
  mObject.Push(i);

Console.WriteLine((string)mObject.PopCheck());

<h2 id="see-also">See also</h2>
<ul><li>L Sharp - Lisp-like scripting language for .NET</li>
<li><a href="/facts/Boo_(programming_language)/CB2lRUwl">Boo</a> - a Python Like language for .NET platform</li>
<li><a href="/facts/IronPython/lpXuCulA">IronPython</a> - an implementation of Python for the .NET platform, similar to <a href="/facts/Jython/BPsxEwnT">Jython</a>.</li>
<li><a href="/facts/Nemerle/6E2y4sHK">Nemerle</a> - a high-level language for the .NET platform.</li></ul>
<h2 id="external-links">External links</h2>
<ul><li><a href="http://www.codeplex.com/scriptdotnet">Latest release</a></li>
<li><a href="http://www.protsyk.com/scriptdotnet/">Script.NET Homepage</a></li>
<li><a href="http://www.protsyk.com/scriptdotnet/examples.html">Code Examples</a></li></ul>

Script.NET open-in-new

Script.NET