final int _readSymbol_(final int symbol) throws IllegalArgumentException {
		switch (symbol) {
			case '\\':
			case '=':
			case ';':
			case ']':
			case '[':
				return symbol;
			case 't':
				return '\t';
			case 'r':
				return '\r';
			case 'n':
				return '\n';
		}
		throw new IllegalArgumentException();
	}