ڤالا
| Paradigm | Multi-paradigm: imperative, structured, object-oriented |
|---|---|
| Developer | Jürg Billeter, Raffaele Sandrini |
| First appeared | 2006 |
| الإصدار المستقر | 0.32.0[1]
/ 21 مارس 2016 |
| 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 |
| 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
الهامش
وصلات خارجية
- Official website, on GNOME Live!
- ValaToWindows, Vala compiled binaries for Windows
- LibGee, a collection library for vala.
- API Documentation
- Vala sample code for beginners
- List of Vala programs
- web-vala, a simple web application framework for Vala
- Comparison with other languages