enigma/utils.go at master · becgabri/enigma

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package enigma

import (

"regexp"

"strings"

)

// CharToIndex returns the alphabet index of a given letter.

func CharToIndex(char byte) int {

return int(char - 'A')

}

// IndexToChar returns the letter with a given alphabet index.

func IndexToChar(index int) byte {

return byte('A' + index)

}

// SanitizePlaintext will prepare a string to be encoded

// in the Enigma machine: everything except A-Z will be

// stripped, spaces will be replaced with "X".

func SanitizePlaintext(plaintext string) string {

plaintext = strings.TrimSpace(plaintext)

plaintext = strings.ToUpper(plaintext)

plaintext = strings.Replace(plaintext, " ", "", -1)

plaintext = regexp.MustCompile(`[^A-Z]`).ReplaceAllString(plaintext, "X")

return plaintext

}

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