MaysWind
75 lines
1.4 KiB
Go
75 lines
1.4 KiB
Go
package utils
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import (
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"crypto/rand"
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"math/big"
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"regexp"
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"strings"
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)
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var (
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numberPattern = regexp.MustCompile("(-?\\d+)(\\.\\d+)?")
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)
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// IsStringOnlyContainsDigits returns whether the specified string only contains digit characters
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func IsStringOnlyContainsDigits(str string) bool {
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for i := 0; i < len(str); i++ {
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if str[i] < '0' || str[i] > '9' {
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return false
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}
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}
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return true
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}
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// GetRandomInteger returns a random number, the max parameter represents upper limit
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func GetRandomInteger(max int) (int, error) {
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result, err := rand.Int(rand.Reader, big.NewInt(int64(max)))
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if err != nil {
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return 0, err
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}
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return int(result.Int64()), nil
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}
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// ParseFirstConsecutiveNumber returns the first consecutive number in the specified string
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func ParseFirstConsecutiveNumber(str string) (string, bool) {
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result := numberPattern.FindAllString(str, 1)
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if len(result) > 0 {
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return result[0], true
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} else {
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return "", false
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}
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}
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// TrimTrailingZerosInDecimal returns a textual number without trailing zeros in decimal
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func TrimTrailingZerosInDecimal(num string) string {
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if len(num) < 1 {
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return num
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}
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dotPosition := strings.Index(num, ".")
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if dotPosition < 0 {
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return num
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}
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lastNonZeroPosition := len(num)
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for i := len(num) - 1; i > dotPosition+1; i-- {
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if num[i] == '0' {
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lastNonZeroPosition = i
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} else {
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break
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}
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}
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if lastNonZeroPosition >= len(num) {
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return num
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}
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return num[0:lastNonZeroPosition]
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}
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