library jsqueeze

patchwork/jsqueeze

Efficient JavaScript minification in PHP

, _(*1)

JSqueeze shrinks / compresses / minifies / mangles Javascript code., _(*2)

It's a single PHP class that has been developed, maintained and thoroughly tested since 2003 on major JavaScript frameworks (e.g. jQuery)., _(*3)

JSqueeze operates on any parse error free JavaScript code, even when semi-colons are missing., _(*4)

In term of compression ratio, it compares to YUI Compressor and UglifyJS., _(*5)

Installation

Through composer:, _(*6)

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

Usage

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.
• 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)., _(*7)