wp-optimize / vendor / mrclay / minify / lib / Minify / YUICompressor.php

YUICompressor.php in WP-Optimize – Cache, Compress images, Minify & Clean database to boost page speed & performance 4.7.0, at vendor/mrclay/minify/lib/Minify/YUICompressor.php

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1	<?php
2	/**
3	* Class Minify_YUICompressor
4	* @package Minify
5	*/
6
7	/**
8	* Compress Javascript/CSS using the YUI Compressor
9	*
10	* You must set $jarFile and $tempDir before calling the minify functions.
11	* Also, depending on your shell's environment, you may need to specify
12	* the full path to java in $javaExecutable or use putenv() to setup the
13	* Java environment.
14	*
15	* <code>
16	* Minify_YUICompressor::$jarFile = '/path/to/yuicompressor-2.4.6.jar';
17	* Minify_YUICompressor::$tempDir = '/tmp';
18	* $code = Minify_YUICompressor::minifyJs(
19	* $code
20	* ,array('nomunge' => true, 'line-break' => 1000)
21	* );
22	* </code>
23	*
24	* Note: In case you run out stack (default is 512k), you may increase stack size in $options:
25	* array('stack-size' => '2048k')
26	*
27	* @todo unit tests, $options docs
28	*
29	* @package Minify
30	* @author Stephen Clay <[email protected]>
31	*/
32	class Minify_YUICompressor
33	{
34
35	/**
36	* Filepath of the YUI Compressor jar file. This must be set before
37	* calling minifyJs() or minifyCss().
38	*
39	* @var string
40	*/
41	public static $jarFile;
42
43	/**
44	* Writable temp directory. This must be set before calling minifyJs()
45	* or minifyCss().
46	*
47	* @var string
48	*/
49	public static $tempDir;
50
51	/**
52	* Filepath of "java" executable (may be needed if not in shell's PATH)
53	*
54	* @var string
55	*/
56	public static $javaExecutable = 'java';
57
58	/**
59	* Minify a Javascript string
60	*
61	* @param string $js
62	*
63	* @param array $options (verbose is ignored)
64	*
65	* @see http://www.julienlecomte.net/yuicompressor/README
66	*
67	* @return string
68	*/
69	public static function minifyJs($js, $options = array())
70	{
71	return self::_minify('js', $js, $options);
72	}
73
74	/**
75	* Minify a CSS string
76	*
77	* @param string $css
78	*
79	* @param array $options (verbose is ignored)
80	*
81	* @see http://www.julienlecomte.net/yuicompressor/README
82	*
83	* @return string
84	*/
85	public static function minifyCss($css, $options = array())
86	{
87	return self::_minify('css', $css, $options);
88	}
89
90	private static function _minify($type, $content, $options)
91	{
92	self::_prepare();
93	if (! ($tmpFile = tempnam(self::$tempDir, 'yuic_'))) {
94	throw new Exception('Minify_YUICompressor : could not create temp file in "'.self::$tempDir.'".');
95	}
96
97	file_put_contents($tmpFile, $content);
98	exec(self::_getCmd($options, $type, $tmpFile), $output, $result_code);
99	unlink($tmpFile);
100	if ($result_code != 0) {
101	throw new Exception('Minify_YUICompressor : YUI compressor execution failed.');
102	}
103
104	return implode("\n", $output);
105	}
106
107	private static function _getCmd($userOptions, $type, $tmpFile)
108	{
109	$defaults = array(
110	'charset' => '',
111	'line-break' => 5000,
112	'type' => $type,
113	'nomunge' => false,
114	'preserve-semi' => false,
115	'disable-optimizations' => false,
116	'stack-size' => '',
117	);
118	$o = array_merge($defaults, $userOptions);
119
120	$cmd = self::$javaExecutable
121	. (!empty($o['stack-size']) ? ' -Xss' . $o['stack-size'] : '')
122	. ' -jar ' . escapeshellarg(self::$jarFile)
123	. " --type {$type}"
124	. (preg_match('/^[\\da-zA-Z0-9\\-]+$/', $o['charset'])
125	? " --charset {$o['charset']}"
126	: '')
127	. (is_numeric($o['line-break']) && $o['line-break'] >= 0
128	? ' --line-break ' . (int)$o['line-break']
129	: '');
130	if ($type === 'js') {
131	foreach (array('nomunge', 'preserve-semi', 'disable-optimizations') as $opt) {
132	$cmd .= $o[$opt]
133	? " --{$opt}"
134	: '';
135	}
136	}
137
138	return $cmd . ' ' . escapeshellarg($tmpFile);
139	}
140
141	private static function _prepare()
142	{
143	if (! is_file(self::$jarFile)) {
144	throw new Exception('Minify_YUICompressor : $jarFile('.self::$jarFile.') is not a valid file.');
145	}
146	if (! is_readable(self::$jarFile)) {
147	throw new Exception('Minify_YUICompressor : $jarFile('.self::$jarFile.') is not readable.');
148	}
149	if (! is_dir(self::$tempDir)) {
150	throw new Exception('Minify_YUICompressor : $tempDir('.self::$tempDir.') is not a valid direcotry.');
151	}
152	if (! is_writable(self::$tempDir)) {
153	throw new Exception('Minify_YUICompressor : $tempDir('.self::$tempDir.') is not writable.');
154	}
155	}
156	}
157