Function generateTokenWithFormat

internal/tokenization/tokenization.go:261–285

generateTokenWithFormat creates a token that matches the format of the original value.

(seed []byte, originalValue string)

// generateTokenWithFormat creates a token that matches the format of the original value.
func generateTokenWithFormat(seed []byte, originalValue string) (string, error) {
	runes := []rune(originalValue)
	result := make([]rune, len(runes))

	// Use the seed to generate random runes that preserve the format
	for i, char := range runes {
		seedByte := seed[i%len(seed)]

		if 'A' <= char && char <= 'Z' {
			// Uppercase letter
			result[i] = 'A' + rune(seedByte%26)
		} else if 'a' <= char && char <= 'z' {
			// Lowercase letter
			result[i] = 'a' + rune(seedByte%26)
		} else if '0' <= char && char <= '9' {
			// Digit
			result[i] = '0' + rune(seedByte%10)
		} else {
			// Preserve special characters (including UTF-8 characters)
			result[i] = char
		}
	}

	return string(result), nil
}