package flags import ( "flag" "fmt" "log" "os" "runtime" ) func (flags *Flags) ParseFlags() { // Define parameters flag.StringVar(&flags.Controller.Row1, "row1", "000000000", "1st row of the sudoku puzzle.") flag.StringVar(&flags.Controller.Row2, "row2", "000000000", "2nd row of the sudoku puzzle.") flag.StringVar(&flags.Controller.Row3, "row3", "000000000", "4rd row of the sudoku puzzle.") flag.StringVar(&flags.Controller.Row4, "row4", "000000000", "4th row of the sudoku puzzle.") flag.StringVar(&flags.Controller.Row5, "row5", "000000000", "5th row of the sudoku puzzle.") flag.StringVar(&flags.Controller.Row6, "row6", "000000000", "6th row of the sudoku puzzle.") flag.StringVar(&flags.Controller.Row7, "row7", "000000000", "7th row of the sudoku puzzle.") flag.StringVar(&flags.Controller.Row8, "row8", "000000000", "8th row of the sudoku puzzle.") flag.StringVar(&flags.Controller.Row9, "row9", "000000000", "9th row of the sudoku puzzle.") flag.IntVar(&flags.Controller.NumCPUs, "numcpu", runtime.NumCPU(), "Number of CPU cores to assign to this task.") flag.IntVar(&flags.Controller.Split, "split", 1, "Split the tasks in n parts. This depends on the availability of the first row.") flag.IntVar(&flags.Controller.Part, "part", 1, "Process part x in n parts. Cannot be lower than 1, or higher than specified in split.") // Parse the flags flag.Parse() // Process any changes to the CPU usage. if flags.Controller.NumCPUs <= 0 { log.Printf("ERROR: Number of CPU cores must be 1 or higher.\n\n") flags.printUsage() os.Exit(1) } if flags.Controller.NumCPUs != runtime.NumCPU() { runtime.GOMAXPROCS(flags.Controller.NumCPUs) } // Process rows if flags.Controller.Row1 == "000000000" || flags.Controller.Row2 == "000000000" || flags.Controller.Row3 == "000000000" || flags.Controller.Row4 == "000000000" || flags.Controller.Row5 == "000000000" || flags.Controller.Row6 == "000000000" || flags.Controller.Row7 == "000000000" || flags.Controller.Row8 == "000000000" || flags.Controller.Row9 == "000000000" { log.Printf("ERROR: All parameters must be entered.\n\n") flags.printUsage() os.Exit(1) } // Validate the row (never trust user input) flags.validateRow("row1", flags.Controller.Row1) flags.validateRow("row2", flags.Controller.Row2) flags.validateRow("row3", flags.Controller.Row3) flags.validateRow("row4", flags.Controller.Row4) flags.validateRow("row5", flags.Controller.Row5) flags.validateRow("row6", flags.Controller.Row6) flags.validateRow("row7", flags.Controller.Row7) flags.validateRow("row8", flags.Controller.Row8) flags.validateRow("row9", flags.Controller.Row9) // Process workload splitting // Ensure split and part are 1 or higher if flags.Controller.Split <= 0 || flags.Controller.Part <= 0 { log.Printf("ERROR: '-split' and '-part' need to be 1 or higher.\n") flags.printUsage() os.Exit(1) } // Ensure part is between 1 and split if flags.Controller.Part > flags.Controller.Split { log.Printf("ERROR: '-part' cannot be bigger than `-split`.\n") flags.printUsage() os.Exit(1) } } func (flags *Flags) validateRow(name string, row string) { var found bool var double bool count := make(map[rune]int) // 1. Make sure the row is 9 in length if len(row) != 9 { log.Printf("ERROR: Invalid length of %s (%s), must be 9 numbers\n\n", name, row) flags.printUsage() os.Exit(1) } // 2. Ensure all digits are numbers for _, value := range row { found = flags.validChar(value) } if !found { log.Printf("ERROR: Invalid character of %s (%s), must be 9 numbers\n\n", name, row) flags.printUsage() os.Exit(1) } // 3. Ensure all digits (except zero) are there only once for _, digits := range row { count[digits] = count[digits] + 1 } for key, value := range count { if value > 1 && key != 48 { double = true } } if double { log.Printf("ERROR: Double character of %s (%s), numbers between 1 and 9 may only be entered once\n\n", name, row) flags.printUsage() os.Exit(1) } } func (flags *Flags) validChar(char rune) (valid bool) { decvals := [10]int{48, 49, 50, 51, 52, 53, 54, 55, 56, 57} for _, value := range decvals { if char == rune(value) { valid = true } } return } func (flags *Flags) printUsage() { fmt.Fprintf(flag.CommandLine.Output(), "Usage of %s:\n", os.Args[0]) fmt.Fprintf(flag.CommandLine.Output(), "\nPut every row of a Sudoku puzzle as paramters.\nUse '0' for what is currently blank in the puzzle you wish to solve.\n\n") fmt.Fprintf(flag.CommandLine.Output(), "Example: %s -row1 ... -row2 ... -row3 ... (etc)\n\n", os.Args[0]) flag.PrintDefaults() }