<?php /* SVN FILE: $Id: SassVariable.php 49 2010-04-04 10:51:24Z chris.l.yates $ */ /**

* SassVariable class file.
* @author                      Chris Yates <chris.l.yates@gmail.com>
* @copyright   Copyright (c) 2010 PBM Web Development
* @license                     http://phamlp.googlecode.com/files/license.txt
* @package                     PHamlP
* @subpackage  Sass.script.literals
*/

/**

* SassVariable class.
* @package                     PHamlP
* @subpackage  Sass.script.literals
*/

class SassScriptVariable {

/**
 * Regex for matching and extracting Variables
 */
const MATCH = '/^(?<!\\\\)(?(?!!important\b)[!\$]([\w-]+))/';

/**
 * @var string name of variable
 */
private $name;

/**
 * SassVariable constructor
 * @param string value of the Variable type
 * @return SassVariable
 */
public function __construct($value) {
        $this->name = substr($value, 1);
}

/**
 * Returns the SassScript object for this variable.
 * @param SassContext context of the variable
 * @return SassLiteral the SassScript object for this variable
 */
public function evaluate($context) {
        return $context->getVariable($this->name);
}

/**
 * Returns a value indicating if a token of this type can be matched at
 * the start of the subject string.
 * @param string the subject string
 * @return mixed match at the start of the string or false if no match
 */
public static function isa($subject) {
        // we need to do the check as preg_match returns a count of 1 if
        // subject == '!important'; the match being an empty match
        return (preg_match(self::MATCH, $subject, $matches) ? (empty($matches[0]) ? false : $matches[0]) : false);
}

}