autoptimize / classes / autoptimizeScripts.php

autoptimizeScripts.php in Autoptimize 0.2, at classes/autoptimizeScripts.php

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1	<?php
2
3	class autoptimizeScripts extends autoptimizeBase
4	{
5	private $scripts = array();
6	private $dontmove = array('document.write','google_ad_client','show_ads.js');
7	private $domove = array('gaJsHost');
8	private $jscode = '';
9	private $url = '';
10	private $move = array();
11
12	//Reads the page and collects script tags
13	public function read()
14	{
15	//Get script files
16	if(preg_match_all('#<script.*</script>#Usmi',$this->content,$matches))
17	{
18	foreach($matches[0] as $tag)
19	{
20	if(preg_match('#src=("\|\')(.*)("\|\')#Usmi',$tag,$source))
21	{
22	//External script
23	$url = current(explode('?',$source[2],2));
24	$path = $this->getpath($url);
25	if($path !==false && preg_match('#\.js$#',$path))
26	{
27	//Good script
28	$this->scripts[] = $path;
29	}else{
30	//External script (example: google analytics)
31	//OR Script is dynamic (.php etc)
32	if($this->ismovable($tag))
33	{
34	$this->move[] = $tag;
35	}
36	}
37	}else{
38	//Inline script
39	if($this->ismergeable($tag))
40	{
41	preg_match('#<script.>(.)</script>#Usmi',$tag,$code);
42	$code = preg_replace('#.<!\[CDATA\[(?:\s\/)?(.)(?://\|/\)\s?\]\]>.*#sm','$1',$code[1]);
43	$code = preg_replace('/(?:^\\s<!--\\s\|\\s(?:\\/\\/)?\\s-->\\s*$)/','',$code);
44	$this->scripts[] = 'INLINE;'.$code;
45	}else{
46	//Can we move this?
47	if($this->ismovable($tag))
48	{
49	$this->move[] = $tag;
50	}/*else{
51	//We shouldn't touch this
52	}*/
53	}
54	}
55
56	//Remove the original script tag
57	$this->content = str_replace($tag,'',$this->content);
58	}
59
60	return true;
61	}
62
63	//No script files :(
64	return false;
65	}
66
67	//Joins and optimizes JS
68	public function minify()
69	{
70	foreach($this->scripts as $script)
71	{
72	if(preg_match('#^INLINE;#',$script))
73	{
74	//Inline script
75	$script = preg_replace('#^INLINE;#','',$script);
76	$this->jscode .= "\n".$script;
77	}else{
78	//External script
79	if($script !== false && file_exists($script) && is_readable($script))
80	{
81	$script = file_get_contents($script);
82	$this->jscode .= "\n".$script;
83	}/*else{
84	//Couldn't read JS. Maybe getpath isn't working?
85	}*/
86	}
87	}
88
89	//$this->jscode has all the uncompressed code now.
90	if(class_exists('JSMin'))
91	{
92	$this->jscode = trim(JSMin::minify($this->jscode));
93	return true;
94	}
95
96	return false;
97	}
98
99	//Caches the JS in uncompressed, deflated and gzipped form.
100	public function cache()
101	{
102	$md5 = md5($this->jscode);
103	$cache = new autopimizeCache(WP_PLUGIN_DIR.'/autoptimize/cache/',$md5);
104	if(!$cache->check())
105	{
106	//Cache our code
107	$cache->cache($this->jscode,'text/javascript');
108	}
109	$this->url = WP_PLUGIN_URL.'/autoptimize/cache/'.$cache->getname();
110	}
111
112	//Returns the content
113	public function getcontent()
114	{
115	$bodyreplacement = implode('',$this->move).'<script type="text/javascript" src="'.$this->url.'"></script></body>';
116	$this->content = str_replace('</body>',$bodyreplacement,$this->content);
117	return $this->content;
118	}
119
120	//Checks agains the whitelist
121	private function ismergeable($tag)
122	{
123	foreach($this->domove as $match)
124	{
125	if(strpos($tag,$match)!==false)
126	{
127	//Matched something
128	return false;
129	}
130	}
131
132	//If we're here it's safe to merge
133	return true;
134	}
135
136	//Checks agains the blacklist
137	private function ismovable($tag)
138	{
139	$allowed = !$this->ismergeable($tag);
140
141	if($allowed == true)
142	{
143	return true;
144	}
145
146	foreach($this->dontmove as $match)
147	{
148	if(strpos($tag,$match)!==false)
149	{
150	//Matched something
151	return false;
152	}
153	}
154
155	//If we're here it's safe to move
156	return true;
157	}
158	}
159