--- /dev/null
+<?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;
+ }
+
+ }
+
+}
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