Advent of Code 2015 day 7 scanf parsing example

day07a-sample.go

func main() {
	scanner := bufio.NewScanner(os.Stdin)
	for scanner.Scan() {
		line := scanner.Text()

		var (
			mnemonic        Mnemonic
			src1, src2, dst string
		)

		if n, _ := fmt.Sscanf(line, "%s -> %s\n", &src1, &dst); n == 2 {
			mnemonic = MOV
		} else if n, _ := fmt.Sscanf(line, "%s AND %s -> %s\n", &src1, &src2, &dst); n == 3 {
			mnemonic = AND
		} else if n, _ := fmt.Sscanf(line, "%s OR %s -> %s\n", &src1, &src2, &dst); n == 3 {
			mnemonic = OR
		} else if n, _ := fmt.Sscanf(line, "%s RSHIFT %s -> %s\n", &src1, &src2, &dst); n == 3 {
			mnemonic = RSHIFT
		} else if n, _ := fmt.Sscanf(line, "%s LSHIFT %s -> %s\n", &src1, &src2, &dst); n == 3 {
			mnemonic = LSHIFT
		} else if n, _ := fmt.Sscanf(line, "NOT %s -> %s\n", &src1, &dst); n == 2 {
			mnemonic = NOT
		} else {
			panic(line)
		}

		wires[dst] = Wire{mnemonic, src1, src2}
	}

	fmt.Println(value("a"))
}