[Gambas-user] interpreter?

[Benoît Minisini]

Le Mercredi 22 Janvier 2003 21:31, Jochen Georges a écrit :
> On Tuesday 21 January 2003 21:45, you wrote:
> > Le Lundi 20 Janvier 2003 14:34, Jochen Georges a écrit :
> > > hi benoit and gambas-gourmets,
>
> ...snip
>
> > The interpreter loads in memory the files generated by the
> > compiler, and then executes them, as needed. The functions and
> > sub you have typed in the editor became "gambas p-code". The
> > gambas p-code is like an assembler that can be interpreted by the
> > gambas interpreter only. Nothing is transformed into C++, nor
> > executed directly by the processor.
>
> thanks for that answer, it is a bit clearer for me now.
> but two questions left:
>
> 111
> the gambas source is compiled and then interpreted?
>
> 222
>
> a gambas component is written in c++:
> it is an interface between gambas and qt
> it translates this
> 	 Button1 Button
> 	    X = 8
> 	    Y = 96
> 	    Width = 304
> 	    Height = 80
> 	    Text = "Button1"
> to that
> 	Knopf::Knopf( QWidget* parent = 0, const char* name = 0 ) :
> 	   QWidget(parent, name) {
> 	        btn = new QPushButton( this, "btn");
> 	        btn->setGeometry(8, 96, 304, 80);
> 	        btn->setText( tr( "Button1" ) );
> 	        connect( btn, SIGNAL(clicked()), this,
> 		SLOT(whateverText()));
> 	} //knopf
>
> if this is right,
>
> who starts the translations, the compiler or the interpreter?
>
>
> thanks for any hint.
>
> beste gruesse
> jochen
>

It is not translated, it is interpreted.

The following stuff:

{ Button1 Button
  X = 8
  Y = 96
  Width = 304
  Height = 80
  Text = "Button1"
}

is transformed by the compiler into the following code:

hButton = NEW Button(...) AS "Button1"
hButton.X = 8
hButton.Y = 96
hButton.Width = 304
...

And then is compiled into p-code.

When the interpreter is running this code, the gb.qt component is first 
loaded. This component tells the interpreter that to instanciate the Button 
class, it must call the C++ function "CBUTTON_new", for example, in the 
component.

This function then makes the corresponding Qt calls, so that the button is 
created as well.

There is no translation from Gambas source code to C++ source code. The C++ 
code is compiled into components, the Gambas source code is compiled into 
Gambas p-code files, and the interpreter interprets these p-code files and 
call method into compiled components.

-- 
Benoît Minisini
mailto:gambas at ...1...