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<?php defined('_JEXEC') or die;
/**
 * @package   Fox Contact for Joomla
 * @copyright Copyright (c) Fox Labs, all rights reserved.
 * @license   Distributed under the terms of the GNU General Public License GNU/GPL v3 http://www.gnu.org/licenses/gpl-3.0.html
 * @see       Documentation: http://www.fox.ra.it/forum/2-documentation.html
 */

class Swift_Mime_Grammar
{
	private static $_specials = array();
	private static $_grammar = array();
	
	public function __construct()
	{
		$this->init();
	}
	
	
	public function __wakeup()
	{
		$this->init();
	}
	
	
	protected function init()
	{
		if (count(self::$_specials) > 0)
		{
			return;
		}
		
		self::$_specials = array('(', ')', '<', '>', '[', ']', ':', ';', '@', ',', '.', '"');
		self::$_grammar['NO-WS-CTL'] = '[\\x01-\\x08\\x0B\\x0C\\x0E-\\x19\\x7F]';
		self::$_grammar['WSP'] = '[ \\t]';
		self::$_grammar['CRLF'] = '(?:\\r\\n)';
		self::$_grammar['FWS'] = '(?:(?:' . self::$_grammar['WSP'] . '*' . self::$_grammar['CRLF'] . ')?' . self::$_grammar['WSP'] . ')';
		self::$_grammar['text'] = '[\\x00-\\x08\\x0B\\x0C\\x0E-\\x7F]';
		self::$_grammar['quoted-pair'] = '(?:\\\\' . self::$_grammar['text'] . ')';
		self::$_grammar['ctext'] = '(?:' . self::$_grammar['NO-WS-CTL'] . '|[\\x21-\\x27\\x2A-\\x5B\\x5D-\\x7E])';
		self::$_grammar['ccontent'] = '(?:' . self::$_grammar['ctext'] . '|' . self::$_grammar['quoted-pair'] . '|(?1))';
		self::$_grammar['comment'] = '(\$(?:' . self::$_grammar['FWS'] . '|' . self::$_grammar['ccontent'] . ')*' . self::$_grammar['FWS'] . '?\$)';
		self::$_grammar['CFWS'] = '(?:(?:' . self::$_grammar['FWS'] . '?' . self::$_grammar['comment'] . ')*(?:(?:' . self::$_grammar['FWS'] . '?' . self::$_grammar['comment'] . ')|' . self::$_grammar['FWS'] . '))';
		self::$_grammar['qtext'] = '(?:' . self::$_grammar['NO-WS-CTL'] . '|[\\x21\\x23-\\x5B\\x5D-\\x7E])';
		self::$_grammar['qcontent'] = '(?:' . self::$_grammar['qtext'] . '|' . self::$_grammar['quoted-pair'] . ')';
		self::$_grammar['quoted-string'] = '(?:' . self::$_grammar['CFWS'] . '?"' . '(' . self::$_grammar['FWS'] . '?' . self::$_grammar['qcontent'] . ')*' . self::$_grammar['FWS'] . '?"' . self::$_grammar['CFWS'] . '?)';
		self::$_grammar['atext'] = '[a-zA-Z0-9!#\\$%&\'\\*\\+\\-\\/=\\?\\^_`\\{\\}\\|~]';
		self::$_grammar['atom'] = '(?:' . self::$_grammar['CFWS'] . '?' . self::$_grammar['atext'] . '+' . self::$_grammar['CFWS'] . '?)';
		self::$_grammar['dot-atom-text'] = '(?:' . self::$_grammar['atext'] . '+' . '(\\.' . self::$_grammar['atext'] . '+)*)';
		self::$_grammar['dot-atom'] = '(?:' . self::$_grammar['CFWS'] . '?' . self::$_grammar['dot-atom-text'] . '+' . self::$_grammar['CFWS'] . '?)';
		self::$_grammar['word'] = '(?:' . self::$_grammar['atom'] . '|' . self::$_grammar['quoted-string'] . ')';
		self::$_grammar['phrase'] = '(?:' . self::$_grammar['word'] . '+?)';
		self::$_grammar['no-fold-quote'] = '(?:"(?:' . self::$_grammar['qtext'] . '|' . self::$_grammar['quoted-pair'] . ')*")';
		self::$_grammar['dtext'] = '(?:' . self::$_grammar['NO-WS-CTL'] . '|[\\x21-\\x5A\\x5E-\\x7E])';
		self::$_grammar['no-fold-literal'] = '(?:\\[(?:' . self::$_grammar['dtext'] . '|' . self::$_grammar['quoted-pair'] . ')*\\])';
		self::$_grammar['id-left'] = '(?:' . self::$_grammar['dot-atom-text'] . '|' . self::$_grammar['no-fold-quote'] . ')';
		self::$_grammar['id-right'] = '(?:' . self::$_grammar['dot-atom-text'] . '|' . self::$_grammar['no-fold-literal'] . ')';
		self::$_grammar['local-part'] = '(?:' . self::$_grammar['dot-atom'] . '|' . self::$_grammar['quoted-string'] . ')';
		self::$_grammar['dcontent'] = '(?:' . self::$_grammar['dtext'] . '|' . self::$_grammar['quoted-pair'] . ')';
		self::$_grammar['domain-literal'] = '(?:' . self::$_grammar['CFWS'] . '?\\[(' . self::$_grammar['FWS'] . '?' . self::$_grammar['dcontent'] . ')*?' . self::$_grammar['FWS'] . '?\\]' . self::$_grammar['CFWS'] . '?)';
		self::$_grammar['domain'] = '(?:' . self::$_grammar['dot-atom'] . '|' . self::$_grammar['domain-literal'] . ')';
		self::$_grammar['addr-spec'] = '(?:' . self::$_grammar['local-part'] . '@' . self::$_grammar['domain'] . ')';
	}
	
	
	public function getDefinition($name)
	{
		if (array_key_exists($name, self::$_grammar))
		{
			return self::$_grammar[$name];
		}
		
		throw new Swift_RfcComplianceException('No such grammar \'' . $name . '\' defined.');
	}
	
	
	public function getGrammarDefinitions()
	{
		return self::$_grammar;
	}
	
	
	public function getSpecials()
	{
		return self::$_specials;
	}
	
	
	public function escapeSpecials($token, $include = array(), $exclude = array())
	{
		foreach (array_merge(array('\\'), array_diff(self::$_specials, $exclude), $include) as $char)
		{
			$token = str_replace($char, '\\' . $char, $token);
		}
		
		return $token;
	}

}

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