ezcache / includes / FileOptimizer / JsMinifier.php

JsMinifier.php in ezCache trunk, at includes/FileOptimizer/JsMinifier.php

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1	<?php
2	namespace Upress\EzCache\FileOptimizer;
3
4	use MatthiasMullie\Minify\JS;
5	use Upress\EzCache\Cache;
6
7	class JsMinifier extends BaseFileOptimizer {
8	static $FILE_TYPE = 'js';
9
10	protected $settings;
11	protected $minify_base_path;
12	protected $minify_base_url;
13
14	function __construct( $cache_dir, $cache_url ) {
15	$this->minify_base_path = $cache_dir;
16	$this->minify_base_url = $cache_url;
17	}
18
19	/**
20	* Minifies CSS files
21	*
22	* @param string $html HTML content.
23	*
24	* @return string
25	*/
26	public function optimize( $html ) {
27	$scripts = $this->find( '<script\s+([^>]+[\s\'"])?src\s=\s[\'"]\s?([^\'"]+\.js(?:\?[^\'"])?)\s*?[\'"]([^>]+)?\/?>', $html );
28
29	if ( ! $scripts ) {
30	return $html;
31	}
32
33	foreach ( $scripts as $script ) {
34	global $wp_scripts;
35
36	if ( preg_match( '/[-.]min\.js/uiU', $script[2] ) ) {
37	continue;
38	}
39
40	if ( preg_match( '/^\/\//ui', $script[2] ) ) {
41	$script[2] = 'http' . (is_ssl() ? 's' : '') . ':' . $script[2];
42	}
43
44	if ( $this->is_external_file( $script[2] ) ) {
45	continue;
46	}
47
48	if ( $this->is_minify_excluded_file( $script ) ) {
49	continue;
50	}
51
52	// Don't minify jQuery included in WP core since it's already minified but without .min in the filename.
53	if ( ! empty( $wp_scripts->registered['jquery-core']->src ) && false !== strpos( $script[2], $wp_scripts->registered['jquery-core']->src ) ) {
54	continue;
55	}
56
57	$minify_url = $this->replace_url( $script[2] );
58
59	if ( ! $minify_url ) {
60	continue;
61	}
62
63	$replace_script = str_replace( $script[2], $minify_url, $script[0] );
64	$replace_script = str_replace( '<script', '<script data-minify="1"', $replace_script );
65	$html = str_replace( $script[0], $replace_script, $html );
66	}
67
68	return $html;
69	}
70
71	/**
72	* Creates the minify URL if the minification is successful
73	*
74	* @param string $url Original file URL.
75
76	* @return string\|bool The minify URL if successful, false otherwise
77	*/
78	private function replace_url( $url ) {
79	if ( empty( $url ) ) {
80	return false;
81	}
82
83	$file_path = $this->get_file_path( $url );
84
85	if ( ! $file_path ) {
86	return false;
87	}
88
89	$minified_content = $this->minify( $file_path );
90
91	if ( ! $minified_content ) {
92	return false;
93	}
94
95	$unique_id = md5( $minified_content );
96	$uri_path = $this->get_url_component( $url, PHP_URL_PATH );
97	$realpath = ltrim( Cache::realpath( $uri_path ), '/' );
98	$filename = preg_replace( '/\.js$/', '-' . $unique_id . '.js', $realpath );
99
100	$minified_file = $this->minify_base_path . $filename;
101	$minified_url = $this->minify_base_url . $filename;
102
103	if ( file_exists( $minified_file ) ) {
104	touch( $minified_file );
105	return $minified_url;
106	}
107
108	wp_mkdir_p( dirname( $minified_file ) );
109	$save_minify_file = file_put_contents( $minified_file, $minified_content );
110
111	if ( ! $save_minify_file ) {
112	return false;
113	}
114
115	return $minified_url;
116	}
117
118	/**
119	* Minifies the content
120	*
121	* @param string\|array $file File to minify.
122	*
123	* @return string\|bool Minified content, false if empty
124	*/
125	protected function minify( $file ) {
126	$file_content = file_get_contents( $file );
127
128	if ( ! $file_content ) {
129	return false;
130	}
131
132	$minifier = new JS( $file_content );
133	$minified_content = $minifier->minify();
134
135	if ( empty( $minified_content ) ) {
136	return false;
137	}
138
139	return $minified_content;
140	}
141	}
142