maemo.org - Talk - View Single Post - Ejscript web application framework for Maemo and Mer

	b-man	2009-06-08 , 22:01
	Posts: 549 \| Thanked: 502 times \| Joined on Feb 2008 @ Bowling Green Ohio (united states)	#1

This is a raw port of the Ejscript javascript application framework. This is an effort to port a powerful yet resource friendly javascript API to both maemo and mer. Ejscript is designed to function from inside OR outside of the browser. (It can function as a fully capable system-wide language (like python, bash, and perl), as a web language, or both) Ejscript is an extended version of javascript that fully supports and complies with the standardized version of JavaScript known as ECMAScript Edition 3 (ECMA-262-3).

Features:

* An environment for high performance web applications
* Fully capable of being a stand-alone programing language like python.
* Integrated SQLite database
* Object Relational Mapper (ORM)
* Ajax view controls
* Full support for jQuery
* A direct-threaded Virtual Machine

Core Features:

* Web Framework - Provides a large amount of Ajax functions when working on browser based applications

* High Performance Virtual Machine - Provides a resource friendly direct-threaded Virtual Machine for running byte compiled javascript code

* Compact Byte Code - for fast execution

* Enhanced Core Language - Ejscript enhances the ECMAScript core with powerful a set of features including: classes and modules for scalable programming, conditional compilation and an enhanced-language mode to detect common JavaScript language issues.

* Extended Language - Provides classes for Events, Timers, Files, Paths, Streams, Sockets and HTTP. There are also significant upgrades for the core system classes: Array, Object and String.

* Useful tools - Includes a fast, optimizing compiler, symbolic assembler listing generator and documentation generation tool.

More documentation on usage can be found here:
http://b-man.psykosis.net/projects/e...documentation/

Source, development, and binary deb packages are available here.

NOTICE: if you are going to build this from source you must use this patch, this disables the '-mcpu' flag from getting used in make.gcc since gcc for armv6l doesn't support this option.

Examples:

Creating a program to use with the interpreter (ejs)

Code:

#!/usr/local/bin/ejs

/* Hello.es */
/* prints Hello World and displays the systems hostname */

testrun();
function testrun(){
	print("Hello, World!!\n");
	print("System Hostname:\n");
	System.run("/bin/hostname");
}
App.exit(0)

Creating and building a program to use with the Virtual Machine (ejsvm)

Code:

/* Hello.es */
module Hello {
	var x = "hello, world!!"
}
use module Test
print(x)

Code:

/* Hello.es */
module Hello {
	print("Hello, World!!");
	App.exit(0);
}

And then compile and run the program with the following:

Code:

ejsc Hello.es

ejsvm Hello.mod

Real-world example:

this program would take test.c and compile it using gcc, strip it, and then run the resulting program test:

Code:

/* Build.es */

module Build {
	compile();
	function compile() {
		sys_make();
	}
		function sys_make() {
			print("Compiling test.c...\n");
			var compile = System.run("/usr/bin/gcc test.c -o test");
			print("Done!\n\n");
			sys_strip();
		}
			function sys_strip(){
				print("striping file...\n\n")
				var strip_file = System.run("/usr/bin/strip test");
				sys_info();
			}
				function sys_info(){
					var info = System.run("/usr/bin/file test");
					print(info+"");
					sys_run();		
					function sys_run(){
					}
						print("\nTesting program...\n\n");
							var test = System.run("./test");
							print(test+"");
							print("\n");
						}
	App.exit(0);
}

Using Ejscript with a browser:

Assuming your app name is going to be web, run the following as root (i'm using my /root directory)

Code:

cd ~/

ejsweb -v generate app web

and to start the localised server run the following:

Code:

cd web

ejsweb run

and open Microb, or any other browser and go to http://localhost:4000/

You should see the following:

And you're done

__________________
I'm an advanced user and a bit of a modder.
----------------------------------------------
I am involved with Mer, Deblet, and NITdroid.
My ports/creations/hacks: GNOME (for Deblet), Cdeb2», Ubuntu, playable flash games in the "Get Started" app, DBS, ect...

enhanced fedora port has been canceled in favor of NITDebian (TBA)

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