Smart pascal source code


Type
  TProc = Procedure;

procedure SayHello;
begin
  WriteLn('Hello');
end;

procedure SayBye;
begin
  WriteLn('Bye');
end;

Procedure Test(Var AProc: TProc);
Begin
  if Assigned(AProc) then
    AProc;
  AProc := SayBye;
End;

var p: TProc;

Test(p);
Test(p);
p := SayHello;
Test(p);
Test(p);

{<<< RESULT - CONSOLE LOG >>>
-----------------------------
Bye
Hello
Bye
-----------------------------
{<<<<<<<<< THE END >>>>>>>>>}

var TObject={
	$ClassName: "TObject",
	$Parent: null,
	ClassName: function (s) { return s.$ClassName },
	ClassType: function (s) { return s },
	ClassParent: function (s) { return s.$Parent },
	$Init: function () {},
	Create: function (s) { return s },
	Destroy: function (s) { for (var prop in s) if (s.hasOwnProperty(prop)) delete s.prop },
	Destroy$: function(s) { return s.ClassType.Destroy(s) },
	Free: function (s) { if (s!==null) s.ClassType.Destroy(s) }
}
var Exception={
	$ClassName: "Exception",
	$Parent: TObject,
	$Init: function () { FMessage="" },
	Create: function (s,Msg) { s.FMessage=Msg; return s }
}
function $New(c) { var i={ClassType:c}; c.$Init(i); return i }
function $CheckFunc(i,z) { if (i) return i; throw Exception.Create($New(Exception),"Function pointer is nil"+z); }
function WriteLn(value) {
    if (window.console) { window.console.log(value); } };
function Test(AProc) {
   if (AProc.v) {
      $CheckFunc(AProc.v,"")();
   }
   AProc.v = SayBye;
};
function SayHello() {
   WriteLn("Hello");
};
function SayBye() {
   WriteLn("Bye");
};
var p = {};
p.v = null;

/* <<< main JS >>> */

   Test(p);
   Test(p);
   p.v = SayHello;
   Test(p);
   Test(p);