55 lines
1.1 KiB
Go
55 lines
1.1 KiB
Go
package flags
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import (
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"fmt"
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"os"
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)
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// Validate if a row is properly set.
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// This check for:
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// - Correct length
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// - Correct numbers
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// - Numbers only present once
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func (flags *Flags) validateRow(name string, row string) {
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var found bool
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var double bool
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count := make(map[rune]int)
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// 1. Make sure the row is 9 in length
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if len(row) != 9 {
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fmt.Printf("ERROR: Invalid length of %s (%s), must be 9 numbers\n\n", name, row)
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flags.printUsage()
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os.Exit(1)
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}
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// 2. Ensure all digits are numbers
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for _, value := range row {
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found = flags.validChar(value)
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}
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if !found {
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fmt.Printf("ERROR: Invalid character of %s (%s), must be 9 numbers\n\n", name, row)
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flags.printUsage()
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os.Exit(1)
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}
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// 3. Ensure all digits (except zero) are there only once
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for _, digits := range row {
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count[digits] = count[digits] + 1
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}
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for key, value := range count {
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if value > 1 && key != 48 {
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double = true
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}
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}
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if double {
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fmt.Printf("ERROR: Double character of %s (%s), numbers between 1 and 9 may only be entered once\n\n", name, row)
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flags.printUsage()
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os.Exit(1)
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}
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}
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