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Efficient JavaScript minification in PHP

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JSqueeze: Efficient JavaScript minification in PHP
==================================================

[![Latest Stable Version](https://poser.pugx.org/patchwork/jsqueeze/v/stable.png)](https://packagist.org/packages/patchwork/jsqueeze)
[![Total Downloads](https://poser.pugx.org/patchwork/jsqueeze/downloads.png)](https://packagist.org/packages/patchwork/jsqueeze)
[![Build Status](https://secure.travis-ci.org/tchwork/jsqueeze.png?branch=master)](http://travis-ci.org/tchwork/jsqueeze)

JSqueeze shrinks / compresses / minifies / mangles Javascript code.

It's a single PHP class that has been developed, maintained and thoroughly
tested since 2003 on major JavaScript frameworks (e.g. jQuery).

JSqueeze operates on any parse error free JavaScript code, even when semi-colons
are missing.

In term of compression ratio, it compares to YUI Compressor and UglifyJS.

Installation
------------

Through [composer](https://getcomposer.org/):

```javascript
{
    "require": {
        "patchwork/jsqueeze": "~2.0"
    }
}
```

Usage
-----

```php

use Patchwork\JSqueeze;

$jz = new JSqueeze();

$minifiedJs = $jz->squeeze(
    $fatJs,
    true,   // $singleLine
    true,   // $keepImportantComments
    false   // $specialVarRx
);
```

Features
--------

* Removes comments and white spaces.
* Renames every local vars, typically to a single character.
* Keep Microsoft's conditional comments.
* In order to maximise later HTTP compression (deflate, gzip), new variables
  names are choosen by considering closures, variables' frequency and
  characters' frequency.
* Can rename also global vars, methods and properties, but only if they are marked
  special by some naming convention. Use JSqueeze::SPECIAL_VAR_PACKER to rename vars
  whose name begins with one or more `$` or with a single `_`.
* Renames also local/global vars found in strings, but only if they are marked
  special.
* If you use `with/eval` then be careful.

Bonus
-----

* Replaces `false/true` by `!1/!0`
* Replaces `new Array/Object` by `[]/{}`
* Merges consecutive `var` declarations with commas
* Merges consecutive concatened strings
* Can replace optional semi-colons by line feeds, thus facilitating output
  debugging.
* Keep important comments marked with `/*!...`
* Treats three semi-colons `;;;` [like single-line comments](http://dean.edwards.name/packer/2/usage/#triple-semi-colon).
* Fix special catch scope across browsers
* Work around buggy-handling of named function expressions in IE<=8

To do?
------

* foo['bar'] => foo.bar
* {'foo':'bar'} => {foo:'bar'}
* Dead code removal (never used function)
* Munge primitives: var WINDOW=window, etc.

License
-------

This library is free software; you can redistribute it and/or modify it
under the terms of the (at your option):
Apache License v2.0 (see provided LICENCE.ASL20 file), or
GNU General Public License v2.0 (see provided LICENCE.GPLv2 file).

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