ڤالا

Vala
Paradigm	Multi-paradigm: imperative, structured, object-oriented
Developer	Jürg Billeter, Raffaele Sandrini
First appeared	2006; 18 years ago
الإصدار المستقر	0.32.0 / 21 مارس 2016; منذ 8 سنين
Typing discipline	static, strong
OS	Cross-platform all supported by GLib, but distributed as source code only.
License	LGPL 2.1+
Filename extensions	.vala, .vapi
Website	wiki.gnome.org/Projects/Vala
Influenced by
	C, C++, C#, D, Java

ڤالا Vala هي لغة برمجة كائنية التوجه مع self-hosting compiler that generates C code and uses the GObject system (that "can be seen as an alternative to C-derived languages such as C++ and Objective-C").

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مثال للكود

A simple "Hello, World!" vala program (see also GTK+ hello world)

void main () {
    print ("Hello World\n");
}

A more complex version, showing some of Vala's object-oriented features:

class Sample : Object {
    void greeting () {
        stdout.printf ("Hello World\n");
    }
    
    static void main (string[] args) {
        var sample = new Sample ();
        sample.greeting ();
    }
}

An example using GTK+ to create a GUI "Hello, World!" program:

using Gtk;

int main (string[] args) {
    Gtk.init (ref args);
    
    var window = new Window ();
    window.title = "Hello, World!";
    window.border_width = 10;
    window.window_position = WindowPosition.CENTER;
    window.set_default_size (350, 70);
    window.destroy.connect (Gtk.main_quit);
    
    var label = new Label ("Hello, World!");
    
    window.add (label);
    window.show_all ();
    
    Gtk.main ();
    return 0;
}

The last example needs an extra parameter to compile on GNOME3 platforms:

valac --pkg gtk+-3.0 hellogtk.vala

This is the converted C code:

/* hellogtk.c generated by valac 0.28.0, the Vala compiler
 * generated from hellogtk.vala, do not modify */

#include <glib.h>
#include <glib-object.h>
#include <stdlib.h>
#include <string.h>
#include <gtk/gtk.h>

#define _g_object_unref0(var) ((var == NULL) ? NULL : (var = (g_object_unref (var), NULL)))

gint _vala_main (gchar** args, int args_length1);
static void _gtk_main_quit_gtk_widget_destroy (GtkWidget* _sender, gpointer self);

static void _gtk_main_quit_gtk_widget_destroy (GtkWidget* _sender, gpointer self) {
	gtk_main_quit ();
}

gint _vala_main (gchar** args, int args_length1) {
	gint result = 0;
	GtkWindow* window = NULL;
	GtkWindow* _tmp0_ = NULL;
	GtkLabel* label = NULL;
	GtkLabel* _tmp1_ = NULL;
	gtk_init (&args_length1, &args);
	_tmp0_ = (GtkWindow*) gtk_window_new (GTK_WINDOW_TOPLEVEL);
	g_object_ref_sink (_tmp0_);
	window = _tmp0_;
	gtk_window_set_title (window, "Hello, World!");
	gtk_container_set_border_width ((GtkContainer*) window, (guint) 10);
	g_object_set (window, "window-position", GTK_WIN_POS_CENTER, NULL);
	gtk_window_set_default_size (window, 350, 70);
	g_signal_connect ((GtkWidget*) window, "destroy", (GCallback) _gtk_main_quit_gtk_widget_destroy, NULL);
	_tmp1_ = (GtkLabel*) gtk_label_new ("Hello, World!");
	g_object_ref_sink (_tmp1_);
	label = _tmp1_;
	gtk_container_add ((GtkContainer*) window, (GtkWidget*) label);
	gtk_widget_show_all ((GtkWidget*) window);
	gtk_main ();
	result = 0;
	_g_object_unref0 (label);
	_g_object_unref0 (window);
	return result;
}

int main (int argc, char ** argv) {
#if !GLIB_CHECK_VERSION (2,35,0)
	g_type_init ();
#endif
	return _vala_main (argv, argc);
}

IDE support

There are various projects in various states of stability in order to provide IDE support for Vala:

Anjuta
Github's Atom (text editor) (With the Vala package installed).
GNOME Builder
Emacs
Euclide
Geany
MonoDevelop
NetBeans
RedCar
Scratch (elementary OS)
Sublime Text (syntax plugin)
TextMate
Vala Toys for Gedit
Val(a)IDE (itself written in Vala, discontinued)^[2]^[3]
Valable, a Vala plug-in for Eclipse.^[4]
Valama^[5]
Valencia
Vim (syntax plugin)

انظر أيضاً

Genie, a programming language for the Vala compiler with a syntax closer to Python
Shotwell, an image organiser written in Vala
Ease, a presentation program written in Vala
elementary OS, a Linux distribution with a desktop environment programmed mostly in Vala