function processor( parser ) {
	var delimiterLastIndex;
	var newlineLastIndex;
	var quoteLastIndex;
	var doublequote;
	var delimiter;
	var newline;
	var strict;
	var quote;
	var max;

	delimiterLastIndex = parser._delimiterLastIndex;
	delimiter = parser._delimiter;

	newlineLastIndex = parser._newlineLastIndex;
	newline = parser._newline;

	quoteLastIndex = parser._quoteLastIndex;
	quote = parser._quote;

	doublequote = parser._doublequote;
	strict = parser._strict;

	max = maximum( maximum( delimiterLastIndex, newlineLastIndex ), quoteLastIndex ); // eslint-disable-line max-len

	return next;

	/**
	* Processes a character.
	*
	* @private
	* @param {string} ch - character
	* @returns {void}
	*/
	function next( ch ) {
		debug( 'Char: %s', ch );

		/*
		* Check for a quote character sequence.
		*
		* ## Notes
		*
		* -   When `doublequote` is `true`, quote character sequences are escaped by a preceding quote character sequence.
		* -   When `doublequote` is `false`, quote character sequences must be explicitly escaped using an escape character sequence.
		*/
		if (
			doublequote &&
			ch === quote[ quoteLastIndex ] &&
			parser._scan( quote, quoteLastIndex )
		) {
			// Keep the escaped quote character sequence and transition back to a quoted field state:
			debug( 'Double quote.' );
			parser._push( ch )._changeState( QUOTED_FIELD );
			return;
		}
		/*
		* Check for a field delimiter.
		*/
		if (
			ch === delimiter[ delimiterLastIndex ] &&
			parser._scan( delimiter, delimiterLastIndex )
		) {
			// Rewind the cursor to point to the last character before the delimiter character sequence:
			debug( 'Delimiter.' );
			parser._rewind( delimiterLastIndex )._changeState( FIELD );
			return;
		}
		/*
		* Check for a row separator.
		*/
		if (
			ch === newline[ newlineLastIndex ] &&
			parser._scan( newline, newlineLastIndex )
		) {
			// Rewind the cursor to point to the last character before the newline character sequence:
			debug( 'Newline.' );
			parser._rewind( newlineLastIndex )._changeState( INIT );
			return;
		}
		/*
		* Check for a non-special character sequence.
		*
		* ## Notes
		*
		* -   Field separators, row separators, and escaped quote sequences must immediately follow a potential closing quote sequence. At some point, we'll have processed a greater number of characters than exists in any of the special character sequences, meaning that none of those sequences immediately follow the quote sequence which led to the current state. Once this happens, we're in an invalid state and must raise an exception, as not clear how the parser should interpret the preceding values (e.g., was the preceding quote supposed to be escaped? was the preceding quote a mistake and should be ignored? are we missing a delimiter or newline sequence? etc.). In strict mode, we raise an exception. In non-strict mode, we only raise an exception if non-whitespace characters follow the potential closing quote sequence.
		*/
		if ( parser._cursor-parser._qidx >= max ) {
			if ( strict ) {
				debug( 'Error.' );
				parser._setErrorState( 'INVALID_CLOSING_QUOTE' )._changeState( ERROR );
				return;
			}
			debug( 'Invalid closing quote.' );
			parser._push( ch )._changeState( INVALID_QUOTE_END );
			return;
		}
		// Continue processing until we can transition to a new state:
		parser._push( ch );
	}
}
Returns a function for processing an ending quote sequence.

@private
@param {Parser} parser - parser instance
@returns {Function} processing function