wpsso / lib / ext / compressor.php

compressor.php in WPSSO Core – Complete Schema Markup and Meta Tags 22.7.0, at lib/ext/compressor.php

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1	<?php
2
3	if ( ! defined( 'ABSPATH' ) ) {
4
5	die( 'These aren\'t the droids you\'re looking for.' );
6	}
7
8	if ( ! class_exists( 'SuextMinifyCssCompressor' ) ) {
9
10	/**
11	* Compress CSS
12	*
13	* This is a heavy regex-based removal of whitespace, unnecessary
14	* comments and tokens, and some CSS value minimization, where practical.
15	* Many steps have been taken to avoid breaking comment-based hacks,
16	* including the ie5/mac filter (and its inversion), but expect tricky
17	* hacks involving comment tokens in 'content' value strings to break
18	* minimization badly. A test suite is available.
19	*
20	* @package Minify
21	* @author Stephen Clay <steve@mrclay.org>
22	* @author http://code.google.com/u/1stvamp/ (Issue 64 patch)
23	*/
24	class SuextMinifyCssCompressor {
25
26	/**
27	* Minify a CSS string
28	*
29	* @param string $css
30	*
31	* @param array $options (currently ignored)
32	*
33	* @return string
34	*/
35	public static function process( $css, $options = array() ) {
36
37	$instance = new SuextMinifyCssCompressor( $options );
38
39	return $instance->_process( $css );
40	}
41
42	/**
43	* @var array
44	*/
45	protected $_options = null;
46
47	/**
48	* Are we "in" a hack? I.e. are some browsers targetted until the next comment?
49	*
50	* @var bool
51	*/
52	protected $_inHack = false;
53
54
55	/**
56	* Constructor
57	*
58	* @param array $options (currently ignored)
59	*/
60	private function __construct($options)
61	{
62	$this->_options = $options;
63	}
64
65	/**
66	* Minify a CSS string
67	*
68	* @param string $css
69	*
70	* @return string
71	*/
72	protected function _process($css)
73	{
74	$css = str_replace("\r\n", "\n", $css);
75
76	// preserve empty comment after '>'
77	// http://www.webdevout.net/css-hacks#in_css-selectors
78	$css = preg_replace('@>/\\\\s\\/@', '>/keep*/', $css);
79
80	// preserve empty comment between property and value
81	// http://css-discuss.incutio.com/?page=BoxModelHack
82	$css = preg_replace('@/\\\\s\\/\\s:@', '/keep/:', $css);
83	$css = preg_replace('@:\\s/\\\\s\\/@', ':/keep/', $css);
84
85	// apply callback to all valid comments (and strip out surrounding ws
86	$css = preg_replace_callback('@\\s/\\([\\s\\S]?)\\/\\s*@'
87	,array($this, '_commentCB'), $css);
88
89	// remove ws around { } and last semicolon in declaration block
90	$css = preg_replace('/\\s{\\s/', '{', $css);
91	$css = preg_replace('/;?\\s}\\s/', '}', $css);
92
93	// remove ws surrounding semicolons
94	$css = preg_replace('/\\s;\\s/', ';', $css);
95
96	// remove ws around urls
97	$css = preg_replace('/
98	url\\( # url(
99	\\s*
100	([^\\)]+?) # 1 = the URL (really just a bunch of non right parenthesis)
101	\\s*
102	\\) # )
103	/x', 'url($1)', $css);
104
105	// remove ws between rules and colons
106	$css = preg_replace('/
107	\\s*
108	([{;]) # 1 = beginning of block or rule separator
109	\\s*
110	([\\*_]?[\\w\\-]+) # 2 = property (and maybe IE filter)
111	\\s*
112	:
113	\\s*
114	(\\b\|[#\'"-]) # 3 = first character of a value
115	/x', '$1$2:$3', $css);
116
117	// remove ws in selectors
118	$css = preg_replace_callback('/
119	(?: # non-capture
120	\\s*
121	[^~>+,\\s]+ # selector part
122	\\s*
123	[,>+~] # combinators
124	)+
125	\\s*
126	[^~>+,\\s]+ # selector part
127	{ # open declaration block
128	/x'
129	,array($this, '_selectorsCB'), $css);
130
131	// minimize hex colors
132	$css = preg_replace('/([^=])#([a-f\\d])\\2([a-f\\d])\\3([a-f\\d])\\4([\\s;\\}])/i'
133	, '$1#$2$3$4$5', $css);
134
135	// remove spaces between font families
136	$css = preg_replace_callback('/font-family:([^;}]+)([;}])/'
137	,array($this, '_fontFamilyCB'), $css);
138
139	$css = preg_replace('/@import\\s+url/', '@import url', $css);
140
141	// replace any ws involving newlines with a single newline
142	$css = preg_replace('/[ \\t]\\n+\\s/', "\n", $css);
143
144	// separate common descendent selectors w/ newlines (to limit line lengths)
145	$css = preg_replace('/([\\w#\\.\\]+)\\s+([\\w#\\.\\]+){/', "$1\n$2{", $css);
146
147	// Use newline after 1st numeric value (to limit line lengths).
148	$css = preg_replace('/
149	((?:padding\|margin\|border\|outline):\\d+(?:px\|em)?) # 1 = prop : 1st numeric value
150	\\s+
151	/x'
152	,"$1\n", $css);
153
154	// prevent triggering IE6 bug: http://www.crankygeek.com/ie6pebug/
155	$css = preg_replace('/:first-l(etter\|ine)\\{/', ':first-l$1 {', $css);
156
157	return trim($css);
158	}
159
160	/**
161	* Replace what looks like a set of selectors
162	*
163	* @param array $m regex matches
164	*
165	* @return string
166	*/
167	protected function _selectorsCB($m)
168	{
169	// remove ws around the combinators
170	return preg_replace('/\\s([,>+~])\\s/', '$1', $m[0]);
171	}
172
173	/**
174	* Process a comment and return a replacement
175	*
176	* @param array $m regex matches
177	*
178	* @return string
179	*/
180	protected function _commentCB($m)
181	{
182	$hasSurroundingWs = (trim($m[0]) !== $m[1]);
183	$m = $m[1];
184	// $m is the comment content w/o the surrounding tokens,
185	// but the return value will replace the entire comment.
186	if ($m === 'keep') {
187	return '/**/';
188	}
189	if ($m === '" "') {
190	// component of http://tantek.com/CSS/Examples/midpass.html
191	return '/" "/';
192	}
193	if (preg_match('@";\\}\\s\\}/\\\\s+@', $m)) {
194	// component of http://tantek.com/CSS/Examples/midpass.html
195	return '/";}}/ */';
196	}
197	if ($this->_inHack) {
198	// inversion: feeding only to one browser
199	if (preg_match('@
200	^/ # comment started like /*/
201	\\s*
202	(\\S[\\s\\S]+?) # has at least some non-ws content
203	\\s*
204	/\\* # ends like // or /*/
205	@x', $m, $n)) {
206	// end hack mode after this comment, but preserve the hack and comment content
207	$this->_inHack = false;
208	return "//{$n[1]}/*/";
209	}
210	}
211	if (substr($m, -1) === '\\') { // comment ends like \*/
212	// begin hack mode and preserve hack
213	$this->_inHack = true;
214	return '/\\/';
215	}
216	if ($m !== '' && $m[0] === '/') { // comment looks like // foo /
217	// begin hack mode and preserve hack
218	$this->_inHack = true;
219	return '///';
220	}
221	if ($this->_inHack) {
222	// a regular comment ends hack mode but should be preserved
223	$this->_inHack = false;
224	return '/**/';
225	}
226	// Issue 107: if there's any surrounding whitespace, it may be important, so
227	// replace the comment with a single space
228	return $hasSurroundingWs // remove all other comments
229	? ' '
230	: '';
231	}
232
233	/**
234	* Process a font-family listing and return a replacement
235	*
236	* @param array $m regex matches
237	*
238	* @return string
239	*/
240	protected function _fontFamilyCB($m)
241	{
242	/*
243	* Update on 2023/11/07 by jsmoriss: Changed null to $limit = -1.
244	*/
245	$pieces = preg_split( '/(\'[^\']+\'\|"[^"]+")/', $m[ 1 ], $limit = -1, PREG_SPLIT_DELIM_CAPTURE \| PREG_SPLIT_NO_EMPTY );
246
247	$out = 'font-family:';
248
249	while (null !== ($piece = array_shift($pieces))) {
250
251	if ($piece[0] !== '"' && $piece[0] !== "'") {
252
253	$piece = preg_replace('/\\s+/', ' ', $piece);
254
255	$piece = preg_replace('/\\s?,\\s?/', ',', $piece);
256	}
257
258	$out .= $piece;
259	}
260
261	return $out . $m[2];
262	}
263	}
264	}
265