public function parse() {
		$this->_invalid = array();
		$this->_parsed = array();
		$this->_lexer = new Lexer($this->_input);

		$this->_applyDefaults();

		foreach ($this->_lexer as $argument) {
			if ($this->_parseFlag($argument)) {
				continue;
			}
			if ($this->_parseOption($argument)) {
				continue;
			}

			array_push($this->_invalid, $argument->raw);
		}

		if ($this->_strict && !empty($this->_invalid)) {
			throw new InvalidArguments($this->_invalid);
		}
	}