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93 lines
2.8 KiB
93 lines
2.8 KiB
5 years ago
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JSqueeze: Efficient JavaScript minification in PHP
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==================================================
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[](https://packagist.org/packages/patchwork/jsqueeze)
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[](https://packagist.org/packages/patchwork/jsqueeze)
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[](http://travis-ci.org/tchwork/jsqueeze)
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JSqueeze shrinks / compresses / minifies / mangles Javascript code.
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It's a single PHP class that has been developed, maintained and thoroughly
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tested since 2003 on major JavaScript frameworks (e.g. jQuery).
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JSqueeze operates on any parse error free JavaScript code, even when semi-colons
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are missing.
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In term of compression ratio, it compares to YUI Compressor and UglifyJS.
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Installation
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------------
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Through [composer](https://getcomposer.org/):
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```javascript
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{
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"require": {
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"patchwork/jsqueeze": "~2.0"
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}
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}
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```
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Usage
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-----
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```php
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use Patchwork\JSqueeze;
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$jz = new JSqueeze();
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$minifiedJs = $jz->squeeze(
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$fatJs,
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true, // $singleLine
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true, // $keepImportantComments
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false // $specialVarRx
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);
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```
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Features
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--------
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* Removes comments and white spaces.
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* Renames every local vars, typically to a single character.
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* Keep Microsoft's conditional comments.
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* In order to maximise later HTTP compression (deflate, gzip), new variables
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names are choosen by considering closures, variables' frequency and
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characters' frequency.
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* Can rename also global vars, methods and properties, but only if they are marked
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special by some naming convention. Use JSqueeze::SPECIAL_VAR_PACKER to rename vars
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whose name begins with one or more `$` or with a single `_`.
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* Renames also local/global vars found in strings, but only if they are marked
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special.
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* If you use `with/eval` then be careful.
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Bonus
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-----
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* Replaces `false/true` by `!1/!0`
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* Replaces `new Array/Object` by `[]/{}`
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* Merges consecutive `var` declarations with commas
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* Merges consecutive concatened strings
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* Can replace optional semi-colons by line feeds, thus facilitating output
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debugging.
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* Keep important comments marked with `/*!...`
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* Treats three semi-colons `;;;` [like single-line comments](http://dean.edwards.name/packer/2/usage/#triple-semi-colon).
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* Fix special catch scope across browsers
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* Work around buggy-handling of named function expressions in IE<=8
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To do?
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------
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* foo['bar'] => foo.bar
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* {'foo':'bar'} => {foo:'bar'}
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* Dead code removal (never used function)
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* Munge primitives: var WINDOW=window, etc.
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License
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-------
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This library is free software; you can redistribute it and/or modify it
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under the terms of the (at your option):
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Apache License v2.0 (see provided LICENCE.ASL20 file), or
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GNU General Public License v2.0 (see provided LICENCE.GPLv2 file).
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