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<?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);
}
}
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