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<?php
/*
* This file is part of SwiftMailer.
* (c) 2004-2009 Chris Corbyn
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
/**
* Defines the grammar to use for validation, implements the RFC 2822 (and friends) ABNF grammar definitions.
* @package Swift
* @subpackage Mime
* @author Fabien Potencier
* @author Chris Corbyn
*/
class Swift_Mime_Grammar
{
/**
* Special characters used in the syntax which need to be escaped.
* @var string[]
* @access private
*/
private $_specials = array();
/**
* Tokens defined in RFC 2822 (and some related RFCs).
* @var string[]
* @access private
*/
private $_grammar = array();
/**
* Initialize some RFC 2822 (and friends) ABNF grammar definitions.
* @access protected
*/
public function __construct()
{
$this->_specials = array(
'(', ')', '<', '>', '[', ']',
':', ';', '@', ',', '.', '"'
);
/*** Refer to RFC 2822 for ABNF grammar ***/
//All basic building blocks
$this->_grammar['NO-WS-CTL'] = '[\x01-\x08\x0B\x0C\x0E-\x19\x7F]';
$this->_grammar['WSP'] = '[ \t]';
$this->_grammar['CRLF'] = '(?:\r\n)';
$this->_grammar['FWS'] = '(?:(?:' . $this->_grammar['WSP'] . '*' .
$this->_grammar['CRLF'] . ')?' . $this->_grammar['WSP'] . ')';
$this->_grammar['text'] = '[\x00-\x08\x0B\x0C\x0E-\x7F]';
$this->_grammar['quoted-pair'] = '(?:\\\\' . $this->_grammar['text'] . ')';
$this->_grammar['ctext'] = '(?:' . $this->_grammar['NO-WS-CTL'] .
'|[\x21-\x27\x2A-\x5B\x5D-\x7E])';
//Uses recursive PCRE (?1) -- could be a weak point??
$this->_grammar['ccontent'] = '(?:' . $this->_grammar['ctext'] . '|' .
$this->_grammar['quoted-pair'] . '|(?1))';
$this->_grammar['comment'] = '(\((?:' . $this->_grammar['FWS'] . '|' .
$this->_grammar['ccontent']. ')*' . $this->_grammar['FWS'] . '?\))';
$this->_grammar['CFWS'] = '(?:(?:' . $this->_grammar['FWS'] . '?' .
$this->_grammar['comment'] . ')*(?:(?:' . $this->_grammar['FWS'] . '?' .
$this->_grammar['comment'] . ')|' . $this->_grammar['FWS'] . '))';
$this->_grammar['qtext'] = '(?:' . $this->_grammar['NO-WS-CTL'] .
'|[\x21\x23-\x5B\x5D-\x7E])';
$this->_grammar['qcontent'] = '(?:' . $this->_grammar['qtext'] . '|' .
$this->_grammar['quoted-pair'] . ')';
$this->_grammar['quoted-string'] = '(?:' . $this->_grammar['CFWS'] . '?"' .
'(' . $this->_grammar['FWS'] . '?' . $this->_grammar['qcontent'] . ')*' .
$this->_grammar['FWS'] . '?"' . $this->_grammar['CFWS'] . '?)';
$this->_grammar['atext'] = '[a-zA-Z0-9!#\$%&\'\*\+\-\/=\?\^_`\{\}\|~]';
$this->_grammar['atom'] = '(?:' . $this->_grammar['CFWS'] . '?' .
$this->_grammar['atext'] . '+' . $this->_grammar['CFWS'] . '?)';
$this->_grammar['dot-atom-text'] = '(?:' . $this->_grammar['atext'] . '+' .
'(\.' . $this->_grammar['atext'] . '+)*)';
$this->_grammar['dot-atom'] = '(?:' . $this->_grammar['CFWS'] . '?' .
$this->_grammar['dot-atom-text'] . '+' . $this->_grammar['CFWS'] . '?)';
$this->_grammar['word'] = '(?:' . $this->_grammar['atom'] . '|' .
$this->_grammar['quoted-string'] . ')';
$this->_grammar['phrase'] = '(?:' . $this->_grammar['word'] . '+?)';
$this->_grammar['no-fold-quote'] = '(?:"(?:' . $this->_grammar['qtext'] .
'|' . $this->_grammar['quoted-pair'] . ')*")';
$this->_grammar['dtext'] = '(?:' . $this->_grammar['NO-WS-CTL'] .
'|[\x21-\x5A\x5E-\x7E])';
$this->_grammar['no-fold-literal'] = '(?:\[(?:' . $this->_grammar['dtext'] .
'|' . $this->_grammar['quoted-pair'] . ')*\])';
//Message IDs
$this->_grammar['id-left'] = '(?:' . $this->_grammar['dot-atom-text'] . '|' .
$this->_grammar['no-fold-quote'] . ')';
$this->_grammar['id-right'] = '(?:' . $this->_grammar['dot-atom-text'] . '|' .
$this->_grammar['no-fold-literal'] . ')';
//Addresses, mailboxes and paths
$this->_grammar['local-part'] = '(?:' . $this->_grammar['dot-atom'] . '|' .
$this->_grammar['quoted-string'] . ')';
$this->_grammar['dcontent'] = '(?:' . $this->_grammar['dtext'] . '|' .
$this->_grammar['quoted-pair'] . ')';
$this->_grammar['domain-literal'] = '(?:' . $this->_grammar['CFWS'] . '?\[(' .
$this->_grammar['FWS'] . '?' . $this->_grammar['dcontent'] . ')*?' .
$this->_grammar['FWS'] . '?\]' . $this->_grammar['CFWS'] . '?)';
$this->_grammar['domain'] = '(?:' . $this->_grammar['dot-atom'] . '|' .
$this->_grammar['domain-literal'] . ')';
$this->_grammar['addr-spec'] = '(?:' . $this->_grammar['local-part'] . '@' .
$this->_grammar['domain'] . ')';
}
/**
* Get the grammar defined for $name token.
* @param string $name execatly as written in the RFC
* @return string
*/
public function getDefinition($name)
{
if (array_key_exists($name, $this->_grammar))
{
return $this->_grammar[$name];
}
else
{
throw new Swift_RfcComplianceException(
"No such grammar '" . $name . "' defined."
);
}
}
/**
* Returns the tokens defined in RFC 2822 (and some related RFCs).
* @return array
*/
public function getGrammarDefinitions()
{
return $this->_grammar;
}
/**
* Returns the current special characters used in the syntax which need to be escaped.
* @return array
*/
public function getSpecials()
{
return $this->_specials;
}
/**
* Escape special characters in a string (convert to quoted-pairs).
* @param string $token
* @param string[] $include additonal chars to escape
* @param string[] $exclude chars from escaping
* @return string
*/
public function escapeSpecials($token, $include = array(),
$exclude = array())
{
foreach (
array_merge(array('\\'), array_diff($this->_specials, $exclude), $include) as $char)
{
$token = str_replace($char, '\\' . $char, $token);
}
return $token;
}
}