wp-optimize / vendor / mrclay / minify / lib / Minify / Lines.php

Lines.php in WP-Optimize – Cache, Compress images, Minify & Clean database to boost page speed & performance 4.5.4, at vendor/mrclay/minify/lib/Minify/Lines.php

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1	<?php
2	/**
3	* Class Minify_Lines
4	* @package Minify
5	*/
6
7	/**
8	* Add line numbers in C-style comments for easier debugging of combined content
9	*
10	* @package Minify
11	* @author Stephen Clay <[email protected]>
12	* @author Adam Pedersen (Issue 55 fix)
13	*/
14	class Minify_Lines
15	{
16
17	/**
18	* Add line numbers in C-style comments
19	*
20	* This uses a very basic parser easily fooled by comment tokens inside
21	* strings or regexes, but, otherwise, generally clean code will not be
22	* mangled. URI rewriting can also be performed.
23	*
24	* @param string $content
25	*
26	* @param array $options available options:
27	*
28	* 'id': (optional) string to identify file. E.g. file name/path
29	*
30	* 'currentDir': (default null) if given, this is assumed to be the
31	* directory of the current CSS file. Using this, minify will rewrite
32	* all relative URIs in import/url declarations to correctly point to
33	* the desired files, and prepend a comment with debugging information about
34	* this process.
35	*
36	* @return string
37	*/
38	public static function minify($content, $options = array())
39	{
40	$id = (isset($options['id']) && $options['id']) ? $options['id'] : '';
41	$content = str_replace("\r\n", "\n", $content);
42
43	$lines = explode("\n", $content);
44	$numLines = count($lines);
45	// determine left padding
46	$padTo = strlen((string) $numLines); // e.g. 103 lines = 3 digits
47	$inComment = false;
48	$i = 0;
49	$newLines = array();
50
51	while (null !== ($line = array_shift($lines))) {
52	if (('' !== $id) && (0 === $i % 50)) {
53	if ($inComment) {
54	array_push($newLines, '', "/* {$id} *\|", '');
55	} else {
56	array_push($newLines, '', "/* {$id} */", '');
57	}
58	}
59
60	++$i;
61	$newLines[] = self::_addNote($line, $i, $inComment, $padTo);
62	$inComment = self::_eolInComment($line, $inComment);
63	}
64
65	$content = implode("\n", $newLines) . "\n";
66
67	// check for desired URI rewriting
68	if (isset($options['currentDir'])) {
69	Minify_CSS_UriRewriter::$debugText = '';
70	$docRoot = isset($options['docRoot']) ? $options['docRoot'] : $_SERVER['DOCUMENT_ROOT'];
71	$symlinks = isset($options['symlinks']) ? $options['symlinks'] : array();
72
73	$content = Minify_CSS_UriRewriter::rewrite($content, $options['currentDir'], $docRoot, $symlinks);
74
75	$content = "/* Minify_CSS_UriRewriter::\$debugText\n\n"
76	. Minify_CSS_UriRewriter::$debugText . "*/\n"
77	. $content;
78	}
79
80	return $content;
81	}
82
83	/**
84	* Is the parser within a C-style comment at the end of this line?
85	*
86	* @param string $line current line of code
87	*
88	* @param bool $inComment was the parser in a C-style comment at the
89	* beginning of the previous line?
90	*
91	* @return bool
92	*/
93	private static function _eolInComment($line, $inComment)
94	{
95	while (strlen($line)) {
96	if ($inComment) {
97	// only "*/" can end the comment
98	$index = self::_find($line, '*/');
99	if ($index === false) {
100	return true;
101	}
102
103	// stop comment and keep walking line
104	$inComment = false;
105	@$line = (string)substr($line, $index + 2);
106	continue;
107	}
108
109	// look for "//" and "/*"
110	$single = self::_find($line, '//');
111	$multi = self::_find($line, '/*');
112	if ($multi === false) {
113	return false;
114	}
115
116	if ($single === false \|\| $multi < $single) {
117	// start comment and keep walking line
118	$inComment = true;
119	@$line = (string)substr($line, $multi + 2);
120	continue;
121	}
122
123	// a single-line comment preceeded it
124	return false;
125	}
126
127	return $inComment;
128	}
129
130	/**
131	* Prepend a comment (or note) to the given line
132	*
133	* @param string $line current line of code
134	*
135	* @param string $note content of note/comment
136	*
137	* @param bool $inComment was the parser in a comment at the
138	* beginning of the line?
139	*
140	* @param int $padTo minimum width of comment
141	*
142	* @return string
143	*/
144	private static function _addNote($line, $note, $inComment, $padTo)
145	{
146	if ($inComment) {
147	$line = '/* ' . str_pad($note, $padTo, ' ', STR_PAD_RIGHT) . ' *\| ' . $line;
148	} else {
149	$line = '/* ' . str_pad($note, $padTo, ' ', STR_PAD_RIGHT) . ' */ ' . $line;
150	}
151
152	return rtrim($line);
153	}
154
155	/**
156	* Find a token trying to avoid false positives
157	*
158	* @param string $str String containing the token
159	* @param string $token Token being checked
160	* @return bool
161	*/
162	private static function _find($str, $token)
163	{
164	switch ($token) {
165	case '//':
166	$fakes = array(
167	'://' => 1,
168	'"//' => 1,
169	'\'//' => 1,
170	'".//' => 2,
171	'\'.//' => 2,
172	);
173	break;
174	case '/*':
175	$fakes = array(
176	'"/*' => 1,
177	'\'/*' => 1,
178	'"//*' => 2,
179	'\'//*' => 2,
180	'".//*' => 3,
181	'\'.//*' => 3,
182	'/' => 1,
183	'\\/*' => 1,
184	);
185	break;
186	default:
187	$fakes = array();
188	}
189
190	$index = strpos($str, $token);
191	$offset = 0;
192
193	while ($index !== false) {
194	foreach ($fakes as $fake => $skip) {
195	$check = substr($str, $index - $skip, strlen($fake));
196	if ($check === $fake) {
197	// move offset and scan again
198	$offset += $index + strlen($token);
199	$index = strpos($str, $token, $offset);
200	break;
201	}
202	}
203	// legitimate find
204	return $index;
205	}
206
207	return $index;
208	}
209	}
210