/
roman.go
113 lines (86 loc) · 3 KB
/
roman.go
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package ntw
import "strings"
func init() {
// register the language
Languages["roman"] = Language{
Name: "Roman Numbers",
Aliases: []string{"roman"},
Flag: "",
IntegerToWords: IntegerToRoman,
}
Languages["roman-unicode"] = Language{
Name: "Roman Numbers (with Unicode)",
Aliases: []string{"roman-unicode"},
Flag: "",
IntegerToWords: IntegerToRomanUnicode,
}
}
func reduceIfSuperiorLoop(words *[]string, input *int, quantity int, word string) {
for *input >= quantity {
*input -= quantity
*words = append(*words, word)
}
}
// IntegerToRoman converts an integer to Roman words
func IntegerToRoman(input int) string {
//log.Printf("Input: %d\n", input)
words := []string{}
if input < 0 {
words = append(words, "-")
input *= -1
}
if input >= 10000 {
return "too big number"
}
if input == 0 {
return "nulla"
}
// I V X L C D M
// 1 4 10 50 100 500 1000
reduceIfSuperiorLoop(&words, &input, 1000, "M")
reduceIfSuperiorLoop(&words, &input, 999, "IM")
reduceIfSuperiorLoop(&words, &input, 995, "VM")
reduceIfSuperiorLoop(&words, &input, 990, "XM")
reduceIfSuperiorLoop(&words, &input, 950, "LM")
reduceIfSuperiorLoop(&words, &input, 900, "CM")
reduceIfSuperiorLoop(&words, &input, 500, "D")
reduceIfSuperiorLoop(&words, &input, 499, "ID")
reduceIfSuperiorLoop(&words, &input, 495, "VD")
reduceIfSuperiorLoop(&words, &input, 490, "XD")
reduceIfSuperiorLoop(&words, &input, 450, "LD")
reduceIfSuperiorLoop(&words, &input, 400, "CD")
reduceIfSuperiorLoop(&words, &input, 100, "C")
reduceIfSuperiorLoop(&words, &input, 99, "IC")
reduceIfSuperiorLoop(&words, &input, 95, "VC")
reduceIfSuperiorLoop(&words, &input, 90, "XC")
reduceIfSuperiorLoop(&words, &input, 50, "L")
reduceIfSuperiorLoop(&words, &input, 49, "IL")
reduceIfSuperiorLoop(&words, &input, 45, "VL")
reduceIfSuperiorLoop(&words, &input, 40, "XL")
reduceIfSuperiorLoop(&words, &input, 10, "X")
reduceIfSuperiorLoop(&words, &input, 9, "IX")
reduceIfSuperiorLoop(&words, &input, 5, "V")
reduceIfSuperiorLoop(&words, &input, 4, "IV")
reduceIfSuperiorLoop(&words, &input, 1, "I")
return strings.Join(words, "")
}
func IntegerToRomanUnicode(input int) string {
roman := IntegerToRoman(input)
roman = strings.Replace(roman, "M", "Ⅿ", -1)
roman = strings.Replace(roman, "D", "Ⅾ", -1)
roman = strings.Replace(roman, "C", "Ⅽ", -1)
roman = strings.Replace(roman, "L", "Ⅼ", -1)
roman = strings.Replace(roman, "IX", "Ⅸ", -1)
roman = strings.Replace(roman, "IV", "Ⅳ", -1)
roman = strings.Replace(roman, "VIII", "Ⅷ", -1)
roman = strings.Replace(roman, "III", "Ⅲ", -1)
roman = strings.Replace(roman, "VII", "Ⅶ", -1)
roman = strings.Replace(roman, "XII", "Ⅻ", -1)
roman = strings.Replace(roman, "II", "Ⅱ", -1)
roman = strings.Replace(roman, "XI", "Ⅺ", -1)
roman = strings.Replace(roman, "VI", "Ⅵ", -1)
roman = strings.Replace(roman, "X", "Ⅹ", -1)
roman = strings.Replace(roman, "V", "Ⅴ", -1)
roman = strings.Replace(roman, "I", "Ⅰ", -1)
return roman
}