wp-optimize / vendor / kriswallsmith / assetic / src / Assetic / Util / CssUtils.php

CssUtils.php in WP-Optimize – Cache, Compress images, Minify & Clean database to boost page speed & performance 3.2.3, at vendor/kriswallsmith/assetic/src/Assetic/Util/CssUtils.php

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1	<?php
2
3	/*
4	* This file is part of the Assetic package, an OpenSky project.
5	*
6	* (c) 2010-2014 OpenSky Project Inc
7	*
8	* For the full copyright and license information, please view the LICENSE
9	* file that was distributed with this source code.
10	*/
11
12	namespace Assetic\Util;
13
14	/**
15	* CSS Utils.
16	*
17	* @author Kris Wallsmith <[email protected]>
18	*/
19	abstract class CssUtils
20	{
21	const REGEX_URLS = '/url$(["\']?)(?P<url>.*?)(\\1)$/';
22	const REGEX_IMPORTS = '/@import (?:url$)?(\'\|"\|)(?P<url>[^\'"$\n\r]*)\1\)?;?/';
23	const REGEX_IMPORTS_NO_URLS = '/@import (?!url$)(\'\|"\|)(?P<url>[^\'"$\n\r]*)\1;?/';
24	const REGEX_IE_FILTERS = '/src=(["\']?)(?P<url>.*?)\\1/';
25	const REGEX_COMMENTS = '/(\/\[^]\+(?:[^\/][^]\+)\/)/';
26
27	/**
28	* Filters all references -- url() and "@import" -- through a callable.
29	*
30	* @param string $content The CSS
31	* @param callable $callback A PHP callable
32	*
33	* @return string The filtered CSS
34	*/
35	public static function filterReferences($content, $callback)
36	{
37	$content = static::filterUrls($content, $callback);
38	$content = static::filterImports($content, $callback, false);
39	$content = static::filterIEFilters($content, $callback);
40
41	return $content;
42	}
43
44	/**
45	* Filters all CSS url()'s through a callable.
46	*
47	* @param string $content The CSS
48	* @param callable $callback A PHP callable
49	*
50	* @return string The filtered CSS
51	*/
52	public static function filterUrls($content, $callback)
53	{
54	$pattern = static::REGEX_URLS;
55
56	return static::filterCommentless($content, function ($part) use (& $callback, $pattern) {
57	return preg_replace_callback($pattern, $callback, $part);
58	});
59	}
60
61	/**
62	* Filters all CSS imports through a callable.
63	*
64	* @param string $content The CSS
65	* @param callable $callback A PHP callable
66	* @param Boolean $includeUrl Whether to include url() in the pattern
67	*
68	* @return string The filtered CSS
69	*/
70	public static function filterImports($content, $callback, $includeUrl = true)
71	{
72	$pattern = $includeUrl ? static::REGEX_IMPORTS : static::REGEX_IMPORTS_NO_URLS;
73
74	return static::filterCommentless($content, function ($part) use (& $callback, $pattern) {
75	return preg_replace_callback($pattern, $callback, $part);
76	});
77	}
78
79	/**
80	* Filters all IE filters (AlphaImageLoader filter) through a callable.
81	*
82	* @param string $content The CSS
83	* @param callable $callback A PHP callable
84	*
85	* @return string The filtered CSS
86	*/
87	public static function filterIEFilters($content, $callback)
88	{
89	$pattern = static::REGEX_IE_FILTERS;
90
91	return static::filterCommentless($content, function ($part) use (& $callback, $pattern) {
92	return preg_replace_callback($pattern, $callback, $part);
93	});
94	}
95
96	/**
97	* Filters each non-comment part through a callable.
98	*
99	* @param string $content The CSS
100	* @param callable $callback A PHP callable
101	*
102	* @return string The filtered CSS
103	*/
104	public static function filterCommentless($content, $callback)
105	{
106	$result = '';
107	foreach (preg_split(static::REGEX_COMMENTS, $content, -1, PREG_SPLIT_DELIM_CAPTURE) as $part) {
108	if (!preg_match(static::REGEX_COMMENTS, $part, $match) \|\| $part != $match[0]) {
109	$part = call_user_func($callback, $part);
110	}
111
112	$result .= $part;
113	}
114
115	return $result;
116	}
117
118	/**
119	* Extracts all references from the supplied CSS content.
120	*
121	* @param string $content The CSS content
122	*
123	* @return array An array of unique URLs
124	*/
125	public static function extractImports($content)
126	{
127	$imports = array();
128	static::filterImports($content, function ($matches) use (&$imports) {
129	$imports[] = $matches['url'];
130	});
131
132	return array_unique(array_filter($imports));
133	}
134
135	final private function __construct()
136	{
137	}
138	}
139