MaysWind
64 lines
1.2 KiB
Go
64 lines
1.2 KiB
Go
package utils
|
|
|
|
import (
|
|
"crypto/rand"
|
|
"math/big"
|
|
"regexp"
|
|
"strings"
|
|
)
|
|
|
|
var (
|
|
numberPattern = regexp.MustCompile("(-?\\d+)(\\.\\d+)?")
|
|
)
|
|
|
|
// GetRandomInteger returns a random number, the max parameter represents upper limit
|
|
func GetRandomInteger(max int) (int, error) {
|
|
result, err := rand.Int(rand.Reader, big.NewInt(int64(max)))
|
|
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
|
|
return int(result.Int64()), nil
|
|
}
|
|
|
|
// ParseFirstConsecutiveNumber returns the first consecutive number in the specified string
|
|
func ParseFirstConsecutiveNumber(str string) (string, bool) {
|
|
result := numberPattern.FindAllString(str, 1)
|
|
|
|
if len(result) > 0 {
|
|
return result[0], true
|
|
} else {
|
|
return "", false
|
|
}
|
|
}
|
|
|
|
// TrimTrailingZerosInDecimal returns a textual number without trailing zeros in decimal
|
|
func TrimTrailingZerosInDecimal(num string) string {
|
|
if len(num) < 1 {
|
|
return num
|
|
}
|
|
|
|
dotPosition := strings.Index(num, ".")
|
|
|
|
if dotPosition < 0 {
|
|
return num
|
|
}
|
|
|
|
lastNonZeroPosition := len(num)
|
|
|
|
for i := len(num) - 1; i > dotPosition+1; i-- {
|
|
if num[i] == '0' {
|
|
lastNonZeroPosition = i
|
|
} else {
|
|
break
|
|
}
|
|
}
|
|
|
|
if lastNonZeroPosition >= len(num) {
|
|
return num
|
|
}
|
|
|
|
return num[0:lastNonZeroPosition]
|
|
}
|