69 lines
1014 B
Go
69 lines
1014 B
Go
package golanghelper
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import "strings"
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const (
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EMPTY = ""
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SPACE = " "
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)
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type StringUtils struct {
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}
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// IsEmpty 會檢查 str 是否為空值
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func (s *StringUtils) IsEmpty(str string) bool {
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return len(str) == 0
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}
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// LeftPad 將 padStr 以 size 做為長度，向左填滿 str
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func (s *StringUtils) LeftPad(str string, size int, padStr string) string {
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if s.IsEmpty(padStr) {
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padStr = SPACE
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}
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padStrLen := len(padStr)
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padCount := size - len(str)
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if padCount <= 0 || padCount < padStrLen {
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return str
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}
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if padCount == padStrLen {
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return padStr + str
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}
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return strings.Repeat(padStr, padCount) + str
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}
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func (s *StringUtils) Substring(str string, start, end int) string {
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if str == "" {
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return str
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}
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runes := []rune(str)
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if end < 0 {
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end = len(runes) + end
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}
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if start < 0 {
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start = len(runes) + start
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}
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if end > len(str) {
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end = len(str)
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}
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if start > end {
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return EMPTY
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}
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if start < 0 {
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start = 0
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}
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if end < 0 {
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end = 0
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}
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return string(runes[start:end])
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}
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