class CSSCompression_Combine_Aural

class CSSCompression_Combine_Aural {
    
    /**
     * Combine Patterns
     *
     * @class Control: Compression Controller
     * @class Combine: Combine Controller
     * @param (regex) raural: Aurual matching
     */
    private $Control;
    private $Combine;
    private $raural = "/(^|(?<!\\\\);)(cue|pause)-(before|after):(.*?)((?<!\\\\);|\$)/";
    
    /**
     * Stash a reference to the controller & combiner
     *
     * @param (class) control: CSSCompression Controller
     * @param (class) combine: CSSCompression Combiner
     */
    public function __construct(CSSCompression_Control $control, CSSCompression_Combine $combine) {
        $this->Control = $control;
        $this->Combine = $combine;
    }
    
    /**
     * Combines Aural properties (currently being depreciated in W3C Standards)
     *
     * @param (string) val: Rule Set
     */
    public function combine($val) {
        $storage = $this->storage($val);
        $pos = 0;
        // Replace first occurance with it's prop, and remove all following occurances
        while (preg_match($this->raural, $val, $match, PREG_OFFSET_CAPTURE, $pos)) {
            $prop = $match[2][0];
            if (isset($storage[$prop])) {
                $colon = strlen($match[1][0]);
                $val = substr_replace($val, $storage[$prop], $match[0][1] + $colon, strlen($match[0][0]) - $colon);
                $pos = $match[0][1] + strlen($storage[$prop]) - $colon - 1;
                $storage[$prop] = '';
            }
            else {
                $pos = $match[0][1] + strlen($match[0][0]) - 1;
            }
        }
        // Return converted val
        return $val;
    }
    
    /**
     * Builds a storage object for iteration
     *
     * @param (string) val: Rule Set
     */
    private function storage($val) {
        $storage = array();
        // Find all possible occurences and build the replacement
        $pos = 0;
        while (preg_match($this->raural, $val, $match, PREG_OFFSET_CAPTURE, $pos)) {
            if (!isset($storage[$match[2][0]])) {
                $storage[$match[2][0]] = array(
                    $match[3][0] => $match[4][0],
                );
            }
            // Override double written properties
            $storage[$match[2][0]][$match[3][0]] = $match[4][0];
            $pos = $match[0][1] + strlen($match[0][0]) - 1;
        }
        // Go through each tag for possible combination
        foreach ($storage as $tag => $arr) {
            // All three have to be defined
            if (count($arr) == 2 && !$this->Combine
                ->checkUncombinables($arr)) {
                $storage[$tag] = "{$tag}:" . $arr['before'] . ' ' . $arr['after'] . ';';
            }
            else {
                unset($storage[$tag]);
            }
        }
        return $storage;
    }
    
    /**
     * Access to private methods for testing
     *
     * @param (string) method: Method to be called
     * @param (array) args: Array of paramters to be passed in
     */
    public function access($method, $args) {
        if (method_exists($this, $method)) {
            return call_user_func_array(array(
                $this,
                $method,
            ), $args);
        }
        else {
            throw new CSSCompression_Exception("Unknown method in Aural Class - " . $method);
        }
    }

}