sudoku-funpark/flags/validateRow.go

55 lines
1.1 KiB
Go

package flags
import (
"fmt"
"os"
)
// Validate if a row is properly set.
// This check for:
// - Correct length
// - Correct numbers
// - Numbers only present once
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 {
fmt.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 {
fmt.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 {
fmt.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)
}
}