Smart pascal source code


type
  TMyProc = procedure;

procedure Proc1;
begin
  WriteLn('Proc1');
end;

procedure Proc2;
begin
  WriteLn('Proc2');
end;

var p, pp: TMyProc;

try
  p;
except
  on E: Exception do
    WriteLn(E.Message)
end;

p := Proc1;
pp := p;
p;
p := Proc2;
p();

pp;
pp := p;
pp();

{<<< RESULT - CONSOLE LOG >>>
-----------------------------
Function pointer is nil [line: 17, column: 5]
Proc1
Proc2
Proc1
Proc2
-----------------------------
{<<<<<<<<< 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 $W(e) { return e.ClassType?e:Exception.Create($New(Exception),e.constructor.name+", "+e.message) }
function $New(c) { var i={ClassType:c}; c.$Init(i); return i }
function $Is(o,c) {
	if (o===null) return false;
	return $Inh(o.ClassType,c);
}
;
function $Inh(s,c) {
	if (s===null) return false;
	while ((s)&&(s!==c)) s=s.$Parent;
	return (s)?true:false;
}
;
function $CheckFunc(i,z) { if (i) return i; throw Exception.Create($New(Exception),"Function pointer is nil"+z); }
function $Check(i,z) { if (i) return i; throw Exception.Create($New(Exception),"Object not instantiated"+z); }
function WriteLn(value) {
    if (window.console) { window.console.log(value); } };
function Proc2() {
   WriteLn("Proc2");
};
function Proc1() {
   WriteLn("Proc1");
};
var p = null;
var pp = null;

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

   try {
      $CheckFunc(p,"")();
   } catch ($e) {
      var E = $W($e);
      WriteLn($Check(E,"").FMessage)   }
   p = Proc1;
   pp = p;
   $CheckFunc(p,"")();
   p = Proc2;
   $CheckFunc(p,"")();
   $CheckFunc(pp,"")();
   pp = p;
   $CheckFunc(pp,"")();