| 1 |  |  | <?php | 
            
                                                                                                            
                            
            
                                    
            
            
                | 2 |  |  | /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 3 |  |  |  * @package   WordPress Dynamic CSS | 
            
                                                                                                            
                            
            
                                    
            
            
                | 4 |  |  |  * @version   1.0.5 | 
            
                                                                                                            
                            
            
                                    
            
            
                | 5 |  |  |  * @author    Askupa Software <[email protected]> | 
            
                                                                                                            
                            
            
                                    
            
            
                | 6 |  |  |  * @link      https://github.com/askupasoftware/wp-dynamic-css | 
            
                                                                                                            
                            
            
                                    
            
            
                | 7 |  |  |  * @copyright 2016 Askupa Software | 
            
                                                                                                            
                            
            
                                    
            
            
                | 8 |  |  |  */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 9 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 10 |  |  | /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 11 |  |  |  * Dynamic CSS Compiler Utility Class | 
            
                                                                                                            
                            
            
                                    
            
            
                | 12 |  |  |  *  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 13 |  |  |  *  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 14 |  |  |  * Dynamic CSS Syntax | 
            
                                                                                                            
                            
            
                                    
            
            
                | 15 |  |  |  * ------------------ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 16 |  |  |  * <pre> | 
            
                                                                                                            
                            
            
                                    
            
            
                | 17 |  |  |  * body {color: $body_color;}  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 18 |  |  |  * </pre> | 
            
                                                                                                            
                            
            
                                    
            
            
                | 19 |  |  |  * In the above example, the variable $body_color is replaced by a value  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 20 |  |  |  * retrieved by the value callback function. The function is passed the variable  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 21 |  |  |  * name without the dollar sign, which can be used with get_option() or  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 22 |  |  |  * get_theme_mod() etc. | 
            
                                                                                                            
                            
            
                                    
            
            
                | 23 |  |  |  */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 24 |  |  | class DynamicCSSCompiler | 
                            
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                | 25 |  |  | { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 26 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 27 |  |  |      * @var DynamicCSSCompiler The reference to *Singleton* instance of this class | 
            
                                                                                                            
                            
            
                                    
            
            
                | 28 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 29 |  |  |     private static $instance; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 30 |  |  |      | 
            
                                                                                                            
                            
            
                                    
            
            
                | 31 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 32 |  |  |      * @var array The list of dynamic styles paths to compile | 
            
                                                                                                            
                            
            
                                    
            
            
                | 33 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 34 |  |  |     private $stylesheets = array(); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 35 |  |  |      | 
            
                                                                                                            
                            
            
                                    
            
            
                | 36 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 37 |  |  |      * @var array The list of registered callbacks | 
            
                                                                                                            
                            
            
                                    
            
            
                | 38 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 39 |  |  |     private $callbacks = array(); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 40 |  |  |      | 
            
                                                                                                            
                            
            
                                    
            
            
                | 41 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 42 |  |  |      * @var aray The list of registered filters | 
            
                                                                                                            
                            
            
                                    
            
            
                | 43 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 44 |  |  |     private $filters = array(); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 45 |  |  |      | 
            
                                                                                                            
                            
            
                                    
            
            
                | 46 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 47 |  |  |      * Returns the *Singleton* instance of this class. | 
            
                                                                                                            
                            
            
                                    
            
            
                | 48 |  |  |      * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 49 |  |  |      * @return DynamicCSSCompiler The *Singleton* instance. | 
            
                                                                                                            
                            
            
                                    
            
            
                | 50 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 51 |  |  |     public static function get_instance() | 
            
                                                                                                            
                            
            
                                    
            
            
                | 52 |  |  |     { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 53 |  |  |         if (null === static::$instance)  | 
                            
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                | 54 |  |  |         { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 55 |  |  |             static::$instance = new static(); | 
                            
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                | 56 |  |  |         } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 57 |  |  |         return static::$instance; | 
                            
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                | 58 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 59 |  |  |      | 
            
                                                                                                            
                            
            
                                    
            
            
                | 60 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 61 |  |  |      * Enqueue the stylesheets that are registered to be loaded externally | 
            
                                                                                                            
                            
            
                                    
            
            
                | 62 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 63 |  |  |     public function enqueue_styles() | 
            
                                                                                                            
                            
            
                                    
            
            
                | 64 |  |  |     { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 65 |  |  |         foreach( $this->stylesheets as $stylesheet ) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 66 |  |  |         { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 67 |  |  |             if( $this->callback_exists( $stylesheet['handle'] ) ) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 68 |  |  |             { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 69 |  |  |                 $this->enqueue_style( $stylesheet ); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 70 |  |  |             } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 71 |  |  |         } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 72 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 73 |  |  |      | 
            
                                                                                                            
                            
            
                                    
            
            
                | 74 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 75 |  |  |      *  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 76 |  |  |      * @param type $stylesheet | 
            
                                                                                                            
                            
            
                                    
            
            
                | 77 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 78 |  |  |     public function enqueue_style( $stylesheet ) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 79 |  |  |     { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 80 |  |  |         $handle = 'wp-dynamic-css-'.$stylesheet['handle']; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 81 |  |  |         $print  = $stylesheet['print']; | 
            
                                                                                                            
                                                                
            
                                    
            
            
                | 82 |  |  |          | 
            
                                                                        
                            
            
                                    
            
            
                | 83 |  |  |         wp_register_style(  | 
            
                                                                        
                            
            
                                    
            
            
                | 84 |  |  |             $handle, | 
            
                                                                        
                            
            
                                    
            
            
                | 85 |  |  |             // Don't pass a URL if this style is to be printed | 
            
                                                                        
                            
            
                                    
            
            
                | 86 |  |  |             $print ? false : $this->get_ajax_callback_url( $stylesheet['handle'] ) | 
            
                                                                        
                            
            
                                    
            
            
                | 87 |  |  |         ); | 
            
                                                                        
                            
            
                                    
            
            
                | 88 |  |  |  | 
            
                                                                        
                            
            
                                    
            
            
                | 89 |  |  |         wp_enqueue_style( $handle ); | 
            
                                                                        
                            
            
                                    
            
            
                | 90 |  |  |          | 
            
                                                                        
                            
            
                                    
            
            
                | 91 |  |  |         if( $stylesheet['print'] ) | 
            
                                                                        
                            
            
                                    
            
            
                | 92 |  |  |         { | 
            
                                                                        
                            
            
                                    
            
            
                | 93 |  |  |             // Inline styles only work if the handle has already been registered and enqueued | 
            
                                                                        
                            
            
                                    
            
            
                | 94 |  |  |             wp_add_inline_style( $handle, $this->get_compiled_style( $stylesheet ) ); | 
            
                                                                        
                            
            
                                    
            
            
                | 95 |  |  |         } | 
            
                                                                        
                            
            
                                    
            
            
                | 96 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 97 |  |  |      | 
            
                                                                                                            
                            
            
                                    
            
            
                | 98 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 99 |  |  |      * This is the AJAX callback used for loading styles externally via an http  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 100 |  |  |      * request. | 
            
                                                                                                            
                            
            
                                    
            
            
                | 101 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 102 |  |  |     public function ajax_callback() | 
            
                                                                                                            
                            
            
                                    
            
            
                | 103 |  |  |     { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 104 |  |  |         header( "Content-type: text/css; charset: UTF-8" ); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 105 |  |  |         $handle = filter_input( INPUT_GET, 'handle' ); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 106 |  |  |          | 
            
                                                                                                            
                            
            
                                    
            
            
                | 107 |  |  |         foreach( $this->stylesheets as $stylesheet ) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 108 |  |  |         { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 109 |  |  |             if( $handle === $stylesheet['handle'] ) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 110 |  |  |             { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 111 |  |  |                 echo $this->get_compiled_style( $stylesheet ); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 112 |  |  |             } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 113 |  |  |         } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 114 |  |  |          | 
            
                                                                                                            
                            
            
                                    
            
            
                | 115 |  |  |         wp_die(); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 116 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 117 |  |  |      | 
            
                                                                                                            
                            
            
                                    
            
            
                | 118 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 119 |  |  |      * Add a style path to the pool of styles to be compiled | 
            
                                                                                                            
                            
            
                                    
            
            
                | 120 |  |  |      *  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 121 |  |  |      * @param string $handle The stylesheet's name/id | 
            
                                                                                                            
                            
            
                                    
            
            
                | 122 |  |  |      * @param string $path The absolute path to the dynamic style | 
            
                                                                                                            
                            
            
                                    
            
            
                | 123 |  |  |      * @param boolean $print Whether to print the compiled CSS to the document | 
            
                                                                                                            
                            
            
                                    
            
            
                | 124 |  |  |      * head, or include it as an external CSS file | 
            
                                                                                                            
                            
            
                                    
            
            
                | 125 |  |  |      * @param boolean $minify Whether to minify the CSS output | 
            
                                                                                                            
                            
            
                                    
            
            
                | 126 |  |  |      * @param boolean $cache Whether to store the compiled version of this  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 127 |  |  |      * stylesheet in cache to avoid compilation on every page load. | 
            
                                                                                                            
                            
            
                                    
            
            
                | 128 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 129 |  |  |     public function register_style( $handle, $path, $print, $minify, $cache ) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 130 |  |  |     { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 131 |  |  |         $this->stylesheets[] = array( | 
            
                                                                                                            
                            
            
                                    
            
            
                | 132 |  |  |             'handle'=> $handle, | 
            
                                                                                                            
                            
            
                                    
            
            
                | 133 |  |  |             'path'  => $path, | 
            
                                                                                                            
                            
            
                                    
            
            
                | 134 |  |  |             'print' => $print, | 
            
                                                                                                            
                            
            
                                    
            
            
                | 135 |  |  |             'minify'=> $minify, | 
            
                                                                                                            
                            
            
                                    
            
            
                | 136 |  |  |             'cache' => $cache | 
            
                                                                                                            
                            
            
                                    
            
            
                | 137 |  |  |         ); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 138 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 139 |  |  |      | 
            
                                                                                                            
                            
            
                                    
            
            
                | 140 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 141 |  |  |      * Register a value retrieval function and associate it with the given handle | 
            
                                                                                                            
                            
            
                                    
            
            
                | 142 |  |  |      *  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 143 |  |  |      * @param type $handle The stylesheet's name/id | 
            
                                                                                                            
                            
            
                                    
            
            
                | 144 |  |  |      * @param type $callback | 
            
                                                                                                            
                            
            
                                    
            
            
                | 145 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 146 |  |  |     public function register_callback( $handle, $callback ) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 147 |  |  |     { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 148 |  |  |         $this->callbacks[$handle] = $callback; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 149 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 150 |  |  |      | 
            
                                                                                                            
                            
            
                                    
            
            
                | 151 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 152 |  |  |      * Register a filter function for a given stylesheet handle. | 
            
                                                                                                            
                            
            
                                    
            
            
                | 153 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 154 |  |  |     public function register_filter( $handle, $filter_name, $callback ) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 155 |  |  |     { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 156 |  |  |         if( !array_key_exists( $handle, $this->filters ) ) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 157 |  |  |         { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 158 |  |  |             $this->filters[$handle] = array(); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 159 |  |  |         } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 160 |  |  |         $this->filters[$handle][$filter_name] = $callback; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 161 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 162 |  |  |      | 
            
                                                                                                            
                            
            
                                    
            
            
                | 163 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 164 |  |  |      * Get the compiled CSS for the given style. Skips compilation if the compiled | 
            
                                                                                                            
                            
            
                                    
            
            
                | 165 |  |  |      * version can be found in cache. | 
            
                                                                                                            
                            
            
                                    
            
            
                | 166 |  |  |      *  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 167 |  |  |      * @param array $style List of styles with the same structure as they are  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 168 |  |  |      * stored in $this->stylesheets | 
            
                                                                                                            
                            
            
                                    
            
            
                | 169 |  |  |      * @return string The compiled CSS for this stylesheet | 
            
                                                                                                            
                            
            
                                    
            
            
                | 170 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 171 |  |  |     protected function get_compiled_style( $style ) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 172 |  |  |     { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 173 |  |  |         $cache = DynamicCSSCache::get_instance(); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 174 |  |  |          | 
            
                                                                                                            
                            
            
                                    
            
            
                | 175 |  |  |         // Use cached compiled CSS if applicable | 
            
                                                                                                            
                            
            
                                    
            
            
                | 176 |  |  |         if( $style['cache'] ) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 177 |  |  |         { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 178 |  |  |             $cached_css = $cache->get( $style['handle'] ); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 179 |  |  |             if( false !== $cached_css ) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 180 |  |  |             { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 181 |  |  |                 return $cached_css; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 182 |  |  |             } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 183 |  |  |         } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 184 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 185 |  |  |         $css = file_get_contents( $style['path'] ); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 186 |  |  |         if( $style['minify'] ) $css = $this->minify_css( $css ); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 187 |  |  |          | 
            
                                                                                                            
                            
            
                                    
            
            
                | 188 |  |  |         // Compile the dynamic CSS | 
            
                                                                                                            
                            
            
                                    
            
            
                | 189 |  |  |         $compiled_css = $this->compile_css(  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 190 |  |  |             $css,  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 191 |  |  |             $this->callbacks[$style['handle']],  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 192 |  |  |             key_exists( $style['handle'], $this->filters ) ? $this->filters[$style['handle']] : array() | 
            
                                                                                                            
                            
            
                                    
            
            
                | 193 |  |  |         ); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 194 |  |  |          | 
            
                                                                                                            
                            
            
                                    
            
            
                | 195 |  |  |         $cache->update( $style['handle'], $compiled_css ); | 
                            
                    |  |  |  | 
                                                                                        
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                | 196 |  |  |         return $this->add_meta_info( $compiled_css ); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 197 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 198 |  |  |      | 
            
                                                                                                            
                            
            
                                    
            
            
                | 199 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 200 |  |  |      * Add meta information to the compiled CSS | 
            
                                                                                                            
                            
            
                                    
            
            
                | 201 |  |  |      *  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 202 |  |  |      * @param string $compiled_css The compiled CSS | 
            
                                                                                                            
                            
            
                                    
            
            
                | 203 |  |  |      * @return string The compiled CSS with the meta information added to it | 
            
                                                                                                            
                            
            
                                    
            
            
                | 204 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 205 |  |  |     protected function add_meta_info( $compiled_css ) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 206 |  |  |     { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 207 |  |  |         return "/**\n". | 
            
                                                                                                            
                            
            
                                    
            
            
                | 208 |  |  |                " * Compiled using wp-dynamic-css\n". | 
            
                                                                                                            
                            
            
                                    
            
            
                | 209 |  |  |                " * https://github.com/askupasoftware/wp-dynamic-css\n". | 
            
                                                                                                            
                            
            
                                    
            
            
                | 210 |  |  |                " */\n\n". | 
            
                                                                                                            
                            
            
                                    
            
            
                | 211 |  |  |                $compiled_css; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 212 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 213 |  |  |      | 
            
                                                                                                            
                            
            
                                    
            
            
                | 214 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 215 |  |  |      * Get the callback URL for enqueuing the stylesheet extrnally | 
            
                                                                                                            
                            
            
                                    
            
            
                | 216 |  |  |      *  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 217 |  |  |      * @param string $handle The stylesheet's handle | 
            
                                                                                                            
                            
            
                                    
            
            
                | 218 |  |  |      * @return string The URL for the given handle | 
            
                                                                                                            
                            
            
                                    
            
            
                | 219 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 220 |  |  |     protected function get_ajax_callback_url( $handle ) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 221 |  |  |     { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 222 |  |  |         return esc_url_raw(  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 223 |  |  |             add_query_arg(array( | 
            
                                                                                                            
                            
            
                                    
            
            
                | 224 |  |  |                 'action' => 'wp_dynamic_css', | 
            
                                                                                                            
                            
            
                                    
            
            
                | 225 |  |  |                 'handle' => $handle | 
            
                                                                                                            
                            
            
                                    
            
            
                | 226 |  |  |             ),  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 227 |  |  |             admin_url( 'admin-ajax.php')) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 228 |  |  |         ); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 229 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 230 |  |  |      | 
            
                                                                                                            
                            
            
                                    
            
            
                | 231 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 232 |  |  |      * Minify a given CSS string by removing comments, whitespaces and newlines | 
            
                                                                                                            
                            
            
                                    
            
            
                | 233 |  |  |      *  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 234 |  |  |      * @see http://stackoverflow.com/a/6630103/1096470 | 
            
                                                                                                            
                            
            
                                    
            
            
                | 235 |  |  |      * @param string $css CSS style to minify | 
            
                                                                                                            
                            
            
                                    
            
            
                | 236 |  |  |      * @return string Minified CSS | 
            
                                                                                                            
                            
            
                                    
            
            
                | 237 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 238 |  |  |     protected function minify_css( $css ) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 239 |  |  |     { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 240 |  |  |         return preg_replace( '@({)\s+|(\;)\s+|/\*.+?\*\/|\R@is', '$1$2 ', $css ); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 241 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 242 |  |  |      | 
            
                                                                                                            
                            
            
                                    
            
            
                | 243 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 244 |  |  |      * Check if a callback function has been register for the given handle. | 
            
                                                                                                            
                            
            
                                    
            
            
                | 245 |  |  |      *  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 246 |  |  |      * @param string $handle  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 247 |  |  |      * @return boolean | 
            
                                                                                                            
                            
            
                                    
            
            
                | 248 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 249 |  |  |     protected function callback_exists( $handle ) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 250 |  |  |     { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 251 |  |  |         if( array_key_exists( $handle, $this->callbacks ) ) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 252 |  |  |         { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 253 |  |  |             return true; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 254 |  |  |         } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 255 |  |  |         trigger_error(  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 256 |  |  |             "There is no callback function associated with the handle '$handle'. ". | 
            
                                                                                                            
                            
            
                                    
            
            
                | 257 |  |  |             "Use <b>wp_dynamic_css_set_callback()</b> to register a callback function for this handle."  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 258 |  |  |         ); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 259 |  |  |         return false; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 260 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 261 |  |  |      | 
            
                                                                                                            
                            
            
                                    
            
            
                | 262 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 263 |  |  |      * Parse the given CSS string by converting the variables to their  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 264 |  |  |      * corresponding values retrieved by applying the callback function | 
            
                                                                                                            
                            
            
                                    
            
            
                | 265 |  |  |      *  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 266 |  |  |      * @param callable $callback A function that replaces the variables with  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 267 |  |  |      * their values. The function accepts the variable's name as a parameter | 
            
                                                                                                            
                            
            
                                    
            
            
                | 268 |  |  |      * @param string $css A string containing dynamic CSS (pre-compiled CSS with  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 269 |  |  |      * variables) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 270 |  |  |      * @return string The compiled CSS after converting the variables to their  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 271 |  |  |      * corresponding values | 
            
                                                                                                            
                            
            
                                    
            
            
                | 272 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 273 |  |  |     protected function compile_css( $css, $callback, $filters ) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 274 |  |  |     { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 275 |  |  |         return preg_replace_callback(  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 276 |  |  |                  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 277 |  |  |             "#".                        // Begin | 
            
                                                                                                            
                            
            
                                    
            
            
                | 278 |  |  |             "\\$".                      // Must start with $ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 279 |  |  |             "([\\w-]+)".                // Match alphanumeric characters and dashes | 
            
                                                                                                            
                            
            
                                    
            
            
                | 280 |  |  |             "((?:\\['?[\\w-]+'?\\])*)". // Optionally match array subscripts i.e. $myVar['index'] | 
            
                                                                                                            
                            
            
                                    
            
            
                | 281 |  |  |             "((?:".                     // Optionally match pipe filters i.e. $myVar|myFilter | 
            
                                                                                                            
                            
            
                                    
            
            
                | 282 |  |  |                 "\\|[\\w-]+".           // Starting with the | character | 
            
                                                                                                            
                            
            
                                    
            
            
                | 283 |  |  |                 "(\([\w\.,']+\))?".     // Filters can have strings and numbers i.e myFilter('string',1,2.5) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 284 |  |  |             ")*)".                      // Allow for 0 or more piped filters | 
            
                                                                                                            
                            
            
                                    
            
            
                | 285 |  |  |             "#",                        // End | 
            
                                                                                                            
                            
            
                                    
            
            
                | 286 |  |  |              | 
            
                                                                                                            
                            
            
                                    
            
            
                | 287 |  |  |             function( $matches ) use ( $callback, $filters )  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 288 |  |  |             { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 289 |  |  |                 $subscripts = array(); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 290 |  |  |                  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 291 |  |  |                 // If this variable is an array, get the subscripts | 
            
                                                                                                            
                            
            
                                    
            
            
                | 292 |  |  |                 if( '' !== $matches[2] ) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 293 |  |  |                 { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 294 |  |  |                     preg_match_all('/[\w-]+/i', $matches[2], $subscripts); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 295 |  |  |                 } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 296 |  |  |                  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 297 |  |  |                 $val = call_user_func_array( $callback, array( $matches[1],@$subscripts[0] ) ); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 298 |  |  |                  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 299 |  |  |                 // If there are filters, apply them | 
            
                                                                                                            
                            
            
                                    
            
            
                | 300 |  |  |                 if( '' !== $matches[3] ) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 301 |  |  |                 { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 302 |  |  |                     $val = $this->apply_filters( substr( $matches[3], 1 ), $val, $filters ); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 303 |  |  |                 } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 304 |  |  |                  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 305 |  |  |                 return $val; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 306 |  |  |             }, $css | 
            
                                                                                                            
                            
            
                                    
            
            
                | 307 |  |  |         ); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 308 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 309 |  |  |      | 
            
                                                                                                            
                            
            
                                    
            
            
                | 310 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 311 |  |  |      * Apply the filters specified in $filters_string to the given $value. | 
            
                                                                                                            
                            
            
                                    
            
            
                | 312 |  |  |      *  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 313 |  |  |      * @param string $filters_string  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 314 |  |  |      * @param string $value | 
            
                                                                                                            
                            
            
                                    
            
            
                | 315 |  |  |      * @param array $filters Array of callback functions | 
            
                                                                                                            
                            
            
                                    
            
            
                | 316 |  |  |      * @return string The value after all filters have been applied | 
            
                                                                                                            
                            
            
                                    
            
            
                | 317 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 318 |  |  |     protected function apply_filters( $filters_string, $value, $filters ) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 319 |  |  |     { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 320 |  |  |         foreach( explode( '|', $filters_string) as $filter ) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 321 |  |  |         { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 322 |  |  |             $args = array( $value ); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 323 |  |  |              | 
            
                                                                                                            
                            
            
                                    
            
            
                | 324 |  |  |             if( false !== strrpos( $filters_string, "(" ) ) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 325 |  |  |             { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 326 |  |  |                 $pieces = explode( '(', $filter ); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 327 |  |  |                 $filter = $pieces[0]; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 328 |  |  |                 $params = explode( ',', str_replace( ')', '', $pieces[1] ) ); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 329 |  |  |                 array_walk( $params, array( $this, 'strtoval' ) ); // Convert string values to actual values | 
            
                                                                                                            
                            
            
                                    
            
            
                | 330 |  |  |                 $args = array_merge( $args, $params ); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 331 |  |  |             } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 332 |  |  |              | 
            
                                                                                                            
                            
            
                                    
            
            
                | 333 |  |  |             if( key_exists( $filter, $filters ) ) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 334 |  |  |             { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 335 |  |  |                 $value = call_user_func_array( $filters[$filter], $args ); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 336 |  |  |             } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 337 |  |  |         } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 338 |  |  |         return $value; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 339 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 340 |  |  |      | 
            
                                                                                                            
                            
            
                                    
            
            
                | 341 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 342 |  |  |      * Convert the given string to its actual value. | 
            
                                                                                                            
                            
            
                                    
            
            
                | 343 |  |  |      *  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 344 |  |  |      * @param string $str The string to be converted (passed by reference) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 345 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 346 |  |  |     protected function strtoval( &$str ) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 347 |  |  |     { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 348 |  |  |         if( 'false' === strtolower($str) ) $str = false; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 349 |  |  |         if( 'true' === strtolower($str) ) $str = true; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 350 |  |  |         if( false !== strrpos( $str, "'" ) ) $str = str_replace ( "'", "", $str ); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 351 |  |  |         if( is_numeric( $str ) ) $str = floatval( $str ); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 352 |  |  |     } | 
            
                                                                                                            
                                                                
            
                                    
            
            
                | 353 |  |  | } | 
            
                                                        
            
                                    
            
            
                | 354 |  |  |  | 
            
                        
You can fix this by adding a namespace to your class:
When choosing a vendor namespace, try to pick something that is not too generic to avoid conflicts with other libraries.