ezcache / includes / FileOptimizer / JsMinifier.php

JsMinifier.php in ezCache 1.2, 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/iU', $script[2] ) ) {
37	continue;
38	}
39
40	if ( $this->is_external_file( $script[2] ) ) {
41	continue;
42	}
43
44	if ( $this->is_minify_excluded_file( $script ) ) {
45	continue;
46	}
47
48	// Don't minify jQuery included in WP core since it's already minified but without .min in the filename.
49	if ( ! empty( $wp_scripts->registered['jquery-core']->src ) && false !== strpos( $script[2], $wp_scripts->registered['jquery-core']->src ) ) {
50	continue;
51	}
52
53	$minify_url = $this->replace_url( $script[2] );
54
55	if ( ! $minify_url ) {
56	continue;
57	}
58
59	$replace_script = str_replace( $script[2], $minify_url, $script[0] );
60	$replace_script = str_replace( '<script', '<script data-minify="1"', $replace_script );
61	$html = str_replace( $script[0], $replace_script, $html );
62	}
63
64	return $html;
65	}
66
67	/**
68	* Creates the minify URL if the minification is successful
69	*
70	* @param string $url Original file URL.
71
72	* @return string\|bool The minify URL if successful, false otherwise
73	*/
74	private function replace_url( $url ) {
75	if ( empty( $url ) ) {
76	return false;
77	}
78
79	$unique_id = md5( $url );
80	$uri_path = $this->get_url_component( $url, PHP_URL_PATH );
81	$realpath = ltrim( Cache::realpath( $uri_path ), '/' );
82	$filename = preg_replace( '/\.js$/', '-' . $unique_id . '.js', $realpath );
83	$minified_file = $this->minify_base_path . $filename;
84	$minified_url = $this->minify_base_url . $filename;
85
86	if ( file_exists( $minified_file ) ) {
87	touch( $minified_file );
88	return $minified_url;
89	}
90
91	$file_path = $this->get_file_path( $url );
92
93	if ( ! $file_path ) {
94	return false;
95	}
96
97	$minified_content = $this->minify( $file_path );
98
99	if ( ! $minified_content ) {
100	return false;
101	}
102
103	wp_mkdir_p( dirname( $minified_file ) );
104	$save_minify_file = file_put_contents( $minified_file, $minified_content );
105
106	if ( ! $save_minify_file ) {
107	return false;
108	}
109
110	return $minified_url;
111	}
112
113	/**
114	* Minifies the content
115	*
116	* @param string\|array $file File to minify.
117	*
118	* @return string\|bool Minified content, false if empty
119	*/
120	protected function minify( $file ) {
121	$file_content = file_get_contents( $file );
122
123	if ( ! $file_content ) {
124	return false;
125	}
126
127	$minifier = new JS( $file_content );
128	$minified_content = $minifier->minify();
129
130	if ( empty( $minified_content ) ) {
131	return false;
132	}
133
134	return $minified_content;
135	}
136	}
137