/**
 * https://tools.ietf.org/html/rfc5228#section-8
 */

(Sieve => {

const
	/**************************************************
	 * https://tools.ietf.org/html/rfc5228#section-8.1
	 **************************************************/

	/**
	 * octet-not-crlf = %x01-09 / %x0B-0C / %x0E-FF
	 * a single octet other than NUL, CR, or LF
	 */
	OCTET_NOT_CRLF = '[^\\x00\\r\\n]',

	/**
	 * octet-not-period = %x01-09 / %x0B-0C / %x0E-2D / %x2F-FF
	 * a single octet other than NUL, CR, LF, or period
	 */
	OCTET_NOT_PERIOD = '[^\\x00\\r\\n\\.]',

	/**
	 * octet-not-qspecial = %x01-09 / %x0B-0C / %x0E-21 / %x23-5B / %x5D-FF
	 * a single octet other than NUL, CR, LF, double-quote, or backslash
	 */
	OCTET_NOT_QSPECIAL = '[^\\x00\\r\\n"\\\\]',

	/**
	 * hash-comment = "#" *octet-not-crlf CRLF
	 */
	HASH_COMMENT = '#' + OCTET_NOT_CRLF + '*\\r\\n',

	/**
	 * QUANTIFIER = "K" / "M" / "G"
	 */
	QUANTIFIER = '[KMGkmg]',

	/**
	 * quoted-safe = CRLF / octet-not-qspecial
	 * either a CRLF pair, OR a single octet other than NUL, CR, LF, double-quote, or backslash
	 */
	QUOTED_SAFE = '\\r\\n|' + OCTET_NOT_QSPECIAL,

	/**
	 * quoted-special = "\" (DQUOTE / "\")
	 * represents just a double-quote or backslash
	 */
	QUOTED_SPECIAL = '\\\\\\\\|\\\\"',

	/**
	 * quoted-text = *(quoted-safe / quoted-special / quoted-other)
	 */
	QUOTED_TEXT = '(?:' + QUOTED_SAFE + '|' + QUOTED_SPECIAL + ')*',

	/**
	 * multiline-literal = [ octet-not-period *octet-not-crlf ] CRLF
	 */
	MULTILINE_LITERAL = OCTET_NOT_PERIOD + OCTET_NOT_CRLF + '*\\r\\n',

	/**
	 * multiline-dotstart = "." 1*octet-not-crlf CRLF
		; A line containing only "." ends the multi-line.
		; Remove a leading '.' if followed by another '.'.
	 */
	MULTILINE_DOTSTART = '\\.' + OCTET_NOT_CRLF + '+\\r\\n',

	/**
	 * not-star = CRLF / %x01-09 / %x0B-0C / %x0E-29 / %x2B-FF
	 * either a CRLF pair, OR a single octet other than NUL, CR, LF, or star
	 */
//	NOT_STAR: '\\r\\n|[^\\x00\\r\\n*]',

	/**
	 * not-star-slash = CRLF / %x01-09 / %x0B-0C / %x0E-29 / %x2B-2E / %x30-FF
	 * either a CRLF pair, OR a single octet other than NUL, CR, LF, star, or slash
	 */
//	NOT_STAR_SLASH: '\\r\\n|[^\\x00\\r\\n*\\\\]',

	/**
	 * STAR = "*"
	 */
//	STAR = '\\*',

	RegEx = {

		/**
		 * bracket-comment = "/*" *not-star 1*STAR *(not-star-slash *not-star 1*STAR) "/"
		 */
		BRACKET_COMMENT: '/\\*[\\s\\S]*?\\*/',

		/**
		 * hash-comment = "#" *octet-not-crlf CRLF
		 */
		HASH_COMMENT: HASH_COMMENT,

		/**
		 * identifier = (ALPHA / "_") *(ALPHA / DIGIT / "_")
		 */
		IDENTIFIER: '[a-zA-Z_][a-zA-Z0-9_]*',

		/**
		 * multi-line = "text:" *(SP / HTAB) (hash-comment / CRLF)
			*(multiline-literal / multiline-dotstart)
			"." CRLF
		 */
		MULTI_LINE: 'text:[ \\t]*(?:' + HASH_COMMENT + ')?\\r\\n'
			+ '(?:' + MULTILINE_LITERAL + '|' + MULTILINE_DOTSTART + ')*'
			+ '\\.\\r\\n',

		MULTILINE_LITERAL: MULTILINE_LITERAL,
		MULTILINE_DOTSTART: MULTILINE_DOTSTART,

		/**
		 * number = 1*DIGIT [ QUANTIFIER ]
		 */
		NUMBER: '[0-9]+' + QUANTIFIER + '?',

		/**
		 * quoted-string = DQUOTE quoted-text DQUOTE
		 */
		QUOTED_STRING: '"' + QUOTED_TEXT + '"',

		QUOTED_TEXT: QUOTED_TEXT,

		/**
		 * tag = ":" identifier
		 */
		TAG: ':[a-zA-Z_][a-zA-Z0-9_]*',

		/**************************************************
		 * https://tools.ietf.org/html/rfc5228#section-8.3
		 **************************************************/

		/**
		 * ADDRESS-PART = ":localpart" / ":domain" / ":all"
		 */
//		ADDRESS_PART: ':localpart|:domain|:all',

		/**
		 * MATCH-TYPE = ":is" / ":contains" / ":matches"
		 */
//		MATCH_TYPE: ':is|:contains|:matches'

	};

/**
 * comment = bracket-comment / hash-comment
 */
//RegEx.COMMENT = RegEx.BRACKET_COMMENT + '|' + HASH_COMMENT;

/**************************************************
 * https://tools.ietf.org/html/rfc5228#section-8.2
 **************************************************/

	/**
	 * string = quoted-string / multi-line
	 */
	RegEx.STRING = RegEx.QUOTED_STRING + '|' + RegEx.MULTI_LINE;

	/**
	 * string-list = "[" string *("," string) "]" / string
	 * if there is only a single string, the brackets are optional
	 */
	RegEx.STRING_LIST = '\\[\\s*(?:' + RegEx.STRING + ')(?:\\s*,\\s*(?:' + RegEx.STRING + '))*\\s*\\]';
//		+ '|(?:' + RegEx.STRING + ')';

	/**
	 * argument = string-list / number / tag
	 */
	RegEx.ARGUMENT = RegEx.STRING_LIST + '|' + RegEx.STRING + '|' + RegEx.NUMBER + '|' + RegEx.TAG;

	/**
	 * arguments = *argument [ test / test-list ]
	 * This is not possible with regular expressions
	 */
//	ARGUMENTS = '(?:\\s+' . self::ARGUMENT . ')*(\\s+?:' . self::TEST . '|' . self::TEST_LIST . ')?';

	/**
	 * block = "{" commands "}"
	 * This is not possible with regular expressions
	 */
//	BLOCK = '{' . self::COMMANDS . '}';

	/**
	 * command = identifier arguments (";" / block)
	 * This is not possible with regular expressions
	 */
//	COMMAND = self::IDENTIFIER . self::ARGUMENTS . '\\s+(?:;|' . self::BLOCK . ')';

	/**
	 * commands = *command
	 * This is not possible with regular expressions
	 */
//	COMMANDS = '(?:' . self::COMMAND . ')*';

	/**
	 * start = commands
	 * This is not possible with regular expressions
	 */
//	START = self::COMMANDS;

	/**
	 * test = identifier arguments
	 * This is not possible with regular expressions
	 */
//	TEST = self::IDENTIFIER . self::ARGUMENTS;

	/**
	 * test-list = "(" test *("," test) ")"
	 * This is not possible with regular expressions
	 */
//	TEST_LIST = '\\(\\s*' . self::TEST . '(?:\\s*,\\s*' . self::TEST . ')*\\s*\\)';


/**************************************************
 * https://tools.ietf.org/html/rfc5228#section-8.3
 **************************************************/

	/**
	 * COMPARATOR = ":comparator" string
	 */
//	RegEx.COMPARATOR = ':comparator\\s+(?:' + RegEx.STRING + ')';


Sieve.RegEx = RegEx;

})(this.Sieve);