An Introduction about Phonegap

What is phonegap ? 
PhoneGap is an open source mobile development framework. It enables all mobile developers to build applications for mobile devices using JavaScript, HTML and CSS.
It is basically bridging the Gap between the Web and mobile devices.

Native Apps VS WebApps :
Native apps are written in a programming language for targeted operating system. 
    Eg: Apple iOs devices : iOs SDK using objective c
           Android Devices : Android SDK using Java

on the other hand WebApps are Web based applications written in traditional web programming languages. 
     Eg:  HTML, CSS, JavaScript, PHP

Native applications are able to communicate with the Mobile device hardware. 
Application built with phonegap is not just a normal web application. They can able to communicate with the mobile hardware, such as accelometer or GPS in ways that are unavailable in normal web applications. 

Phonegap applications are also built and packaged like native applications, that means they can distribute through Apple store or Android Market.

Why PhoneGap
Mobile development is a mess, building applications for each devices iPhone, Android mobiles, Windows Phone ect.  requires different frameworks and languages.
But PhoneGap does not need those things. 
Further more it is an open source implementation. It supports iPhone, Android, Blackberry, WebOs, Windowsphone, and Simbian

How PhoneGap works
Build your app once in web standards
Wrap it with the phoneGap - PhoneGap build you can get get the access to the native APIs
Deploy to multiple platforms


Advantages :
1. Use single code base for multiple platform applications 
2. You can leverage the hardware specific features such as Geolocation Accelorometer
3. Open source
4. Requires knowledge of common web technologies rather than multiple distinct platforms

What is a Compiler

A Compiler is a Computer Program that translates or compiles a program written in the high level programming language into the low level programming language.

It is used to cover the gab between the high level language and machine language.

Every high level language has its own syntax that's why the concept of compiler arose... By Compiler the syntax of one language is understood and converted machine understandable language.

The phases of a compiler 

We split the compilation into several phases with well defined interfaces.
The compiler consists of 3 main parts:

• Front end
• Lexical analysis
• Syntax analysis
• Type checking
• Intermediate end
• Intermediate code generation
• Back end
• Register allocation
• Machine code generation
• Assembly and linking

Each phase, through checking and transformation, establishes stronger in variants on the things it passes on to the next, so that writing each subsequent phase is easier than if these have to take all the preceding into account.