summaryrefslogtreecommitdiffstats
path: root/library/vendor/lessphp/lib/Less/Cache.php
blob: ce09eea469126b1162c5b4ecf059c35b6ed25555 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
<?php

require_once dirname( __FILE__ ).'/Version.php';

/**
 * Utility for handling the generation and caching of css files
 *
 * @package Less
 * @subpackage cache
 */
class Less_Cache {

	// directory less.php can use for storing data
	public static $cache_dir	= false;

	// prefix for the storing data
	public static $prefix		= 'lessphp_';

	// prefix for the storing vars
	public static $prefix_vars	= 'lessphpvars_';

	// specifies the number of seconds after which data created by less.php will be seen as 'garbage' and potentially cleaned up
	public static $gc_lifetime	= 604800;

	/**
	 * Save and reuse the results of compiled less files.
	 * The first call to Get() will generate css and save it.
	 * Subsequent calls to Get() with the same arguments will return the same css filename
	 *
	 * @param array $less_files Array of .less files to compile
	 * @param array $parser_options Array of compiler options
	 * @param array $modify_vars Array of variables
	 * @return string Name of the css file
	 */
	public static function Get( $less_files, $parser_options = array(), $modify_vars = array() ) {
		// check $cache_dir
		if ( isset( $parser_options['cache_dir'] ) ) {
			Less_Cache::$cache_dir = $parser_options['cache_dir'];
		}

		if ( empty( Less_Cache::$cache_dir ) ) {
			throw new Exception( 'cache_dir not set' );
		}

		if ( isset( $parser_options['prefix'] ) ) {
			Less_Cache::$prefix = $parser_options['prefix'];
		}

		if ( empty( Less_Cache::$prefix ) ) {
			throw new Exception( 'prefix not set' );
		}

		if ( isset( $parser_options['prefix_vars'] ) ) {
			Less_Cache::$prefix_vars = $parser_options['prefix_vars'];
		}

		if ( empty( Less_Cache::$prefix_vars ) ) {
			throw new Exception( 'prefix_vars not set' );
		}

		self::CheckCacheDir();
		$less_files = (array)$less_files;

		// create a file for variables
		if ( !empty( $modify_vars ) ) {
			$lessvars = Less_Parser::serializeVars( $modify_vars );
			$vars_file = Less_Cache::$cache_dir . Less_Cache::$prefix_vars . sha1( $lessvars ) . '.less';

			if ( !file_exists( $vars_file ) ) {
				file_put_contents( $vars_file, $lessvars );
			}

			$less_files += array( $vars_file => '/' );
		}

		// generate name for compiled css file
		$hash = md5( json_encode( $less_files ) );
		$list_file = Less_Cache::$cache_dir . Less_Cache::$prefix . $hash . '.list';

		// check cached content
		if ( !isset( $parser_options['use_cache'] ) || $parser_options['use_cache'] === true ) {
			if ( file_exists( $list_file ) ) {

				self::ListFiles( $list_file, $list, $cached_name );
				$compiled_name = self::CompiledName( $list, $hash );

				// if $cached_name is the same as the $compiled name, don't regenerate
				if ( !$cached_name || $cached_name === $compiled_name ) {

					$output_file = self::OutputFile( $compiled_name, $parser_options );

					if ( $output_file && file_exists( $output_file ) ) {
						@touch( $list_file );
						return basename( $output_file ); // for backwards compatibility, we just return the name of the file
					}
				}
			}
		}

		$compiled = self::Cache( $less_files, $parser_options );
		if ( !$compiled ) {
			return false;
		}

		$compiled_name = self::CompiledName( $less_files, $hash );
		$output_file = self::OutputFile( $compiled_name, $parser_options );

		// save the file list
		$list = $less_files;
		$list[] = $compiled_name;
		$cache = implode( "\n", $list );
		file_put_contents( $list_file, $cache );

		// save the css
		file_put_contents( $output_file, $compiled );

		// clean up
		self::CleanCache();

		return basename( $output_file );
	}

	/**
	 * Force the compiler to regenerate the cached css file
	 *
	 * @param array $less_files Array of .less files to compile
	 * @param array $parser_options Array of compiler options
	 * @param array $modify_vars Array of variables
	 * @return string Name of the css file
	 */
	public static function Regen( $less_files, $parser_options = array(), $modify_vars = array() ) {
		$parser_options['use_cache'] = false;
		return self::Get( $less_files, $parser_options, $modify_vars );
	}

	public static function Cache( &$less_files, $parser_options = array() ) {
		// get less.php if it exists
		$file = dirname( __FILE__ ) . '/Less.php';
		if ( file_exists( $file ) && !class_exists( 'Less_Parser' ) ) {
			require_once $file;
		}

		$parser_options['cache_dir'] = Less_Cache::$cache_dir;
		$parser = new Less_Parser( $parser_options );

		// combine files
		foreach ( $less_files as $file_path => $uri_or_less ) {

			// treat as less markup if there are newline characters
			if ( strpos( $uri_or_less, "\n" ) !== false ) {
				$parser->Parse( $uri_or_less );
				continue;
			}

			$parser->ParseFile( $file_path, $uri_or_less );
		}

		$compiled = $parser->getCss();

		$less_files = $parser->allParsedFiles();

		return $compiled;
	}

	private static function OutputFile( $compiled_name, $parser_options ) {
		// custom output file
		if ( !empty( $parser_options['output'] ) ) {

			// relative to cache directory?
			if ( preg_match( '#[\\\\/]#', $parser_options['output'] ) ) {
				return $parser_options['output'];
			}

			return Less_Cache::$cache_dir.$parser_options['output'];
		}

		return Less_Cache::$cache_dir.$compiled_name;
	}

	private static function CompiledName( $files, $extrahash ) {
		// save the file list
		$temp = array( Less_Version::cache_version );
		foreach ( $files as $file ) {
			$temp[] = filemtime( $file )."\t".filesize( $file )."\t".$file;
		}

		return Less_Cache::$prefix.sha1( json_encode( $temp ).$extrahash ).'.css';
	}

	public static function SetCacheDir( $dir ) {
		Less_Cache::$cache_dir = $dir;
		self::CheckCacheDir();
	}

	public static function CheckCacheDir() {
		Less_Cache::$cache_dir = str_replace( '\\', '/', Less_Cache::$cache_dir );
		Less_Cache::$cache_dir = rtrim( Less_Cache::$cache_dir, '/' ).'/';

		if ( !file_exists( Less_Cache::$cache_dir ) ) {
			if ( !mkdir( Less_Cache::$cache_dir ) ) {
				throw new Less_Exception_Parser( 'Less.php cache directory couldn\'t be created: '.Less_Cache::$cache_dir );
			}

		} elseif ( !is_dir( Less_Cache::$cache_dir ) ) {
			throw new Less_Exception_Parser( 'Less.php cache directory doesn\'t exist: '.Less_Cache::$cache_dir );

		} elseif ( !is_writable( Less_Cache::$cache_dir ) ) {
			throw new Less_Exception_Parser( 'Less.php cache directory isn\'t writable: '.Less_Cache::$cache_dir );

		}

	}

	/**
	 * Delete unused less.php files
	 */
	public static function CleanCache() {
		static $clean = false;

		if ( $clean || empty( Less_Cache::$cache_dir ) ) {
			return;
		}

		$clean = true;

		// only remove files with extensions created by less.php
		// css files removed based on the list files
		$remove_types = array( 'lesscache' => 1,'list' => 1,'less' => 1,'map' => 1 );

		$files = scandir( Less_Cache::$cache_dir );
		if ( !$files ) {
			return;
		}

		$check_time = time() - self::$gc_lifetime;
		foreach ( $files as $file ) {

			// don't delete if the file wasn't created with less.php
			if ( strpos( $file, Less_Cache::$prefix ) !== 0 ) {
				continue;
			}

			$parts = explode( '.', $file );
			$type = array_pop( $parts );

			if ( !isset( $remove_types[$type] ) ) {
				continue;
			}

			$full_path = Less_Cache::$cache_dir . $file;
			$mtime = filemtime( $full_path );

			// don't delete if it's a relatively new file
			if ( $mtime > $check_time ) {
				continue;
			}

			// delete the list file and associated css file
			if ( $type === 'list' ) {
				self::ListFiles( $full_path, $list, $css_file_name );
				if ( $css_file_name ) {
					$css_file = Less_Cache::$cache_dir . $css_file_name;
					if ( file_exists( $css_file ) ) {
						unlink( $css_file );
					}
				}
			}

			unlink( $full_path );
		}

	}

	/**
	 * Get the list of less files and generated css file from a list file
	 */
	static function ListFiles( $list_file, &$list, &$css_file_name ) {
		$list = explode( "\n", file_get_contents( $list_file ) );

		// pop the cached name that should match $compiled_name
		$css_file_name = array_pop( $list );

		if ( !preg_match( '/^' . Less_Cache::$prefix . '[a-f0-9]+\.css$/', $css_file_name ) ) {
			$list[] = $css_file_name;
			$css_file_name = false;
		}

	}

}