54 lines
1.2 KiB
Go
54 lines
1.2 KiB
Go
|
package abcex
|
||
|
|
|
||
|
|
import "fmt"
|
||
|
|
import "math"
|
||
|
|
|
||
|
|
var decToAbcex = map[int]string{
|
||
|
|
0: "0", 1: "1", 2: "2", 3: "3", 4: "4", 5: "5", 6: "6", 7: "7",
|
||
|
|
8: "8", 9: "9", 10: "a", 11: "b", 12: "c", 13: "d", 14: "e",
|
||
|
|
15: "f", 16: "g", 17: "h", 18: "i", 19: "j", 20: "k", 21: "l",
|
||
|
|
22: "m", 23: "n", 24: "o", 25: "p", 26: "q", 27: "r", 28: "s",
|
||
|
|
29: "t", 30: "u", 31: "v", 32: "w", 33: "x", 34: "y", 35: "z" }
|
||
|
|
|
||
|
|
var abcexToDec = flipMap()
|
||
|
|
|
||
|
|
func reverse(s string) string {
|
||
|
|
runes := []rune(s)
|
||
|
|
for i, j := 0, len(runes)-1; i < j; i, j = i+1, j-1 {
|
||
|
|
runes[i], runes[j] = runes[j], runes[i]
|
||
|
|
}
|
||
|
|
return string(runes)
|
||
|
|
}
|
||
|
|
|
||
|
|
func flipMap() map[string]int {
|
||
|
|
flipped := make(map[string]int)
|
||
|
|
for i, val := range decToAbcex {
|
||
|
|
flipped[val] = i
|
||
|
|
}
|
||
|
|
|
||
|
|
return flipped
|
||
|
|
}
|
||
|
|
|
||
|
|
func Encode(number int64) string{
|
||
|
|
result := ""
|
||
|
|
|
||
|
|
for number > 0 {
|
||
|
|
result = fmt.Sprintf("%s%s", decToAbcex[int(number % 36)], result)
|
||
|
|
number /= 36
|
||
|
|
}
|
||
|
|
|
||
|
|
return result
|
||
|
|
}
|
||
|
|
|
||
|
|
func Decode(str string) int64 {
|
||
|
|
var result int64
|
||
|
|
result = 0
|
||
|
|
str = reverse(str)
|
||
|
|
|
||
|
|
for i, c := range str {
|
||
|
|
result = int64(math.Pow(36, float64(i))) * int64(abcexToDec[string(c)]) + result
|
||
|
|
}
|
||
|
|
|
||
|
|
return result
|
||
|
|
}
|