mirror of
https://github.com/duke-git/lancet.git
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70 lines
1.9 KiB
Go
70 lines
1.9 KiB
Go
// Copyright 2021 dudaodong@gmail.com. All rights reserved.
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// Use of this source code is governed by MIT license
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// Package formatter implements some functions to format string, struct.
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package formatter
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import (
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"golang.org/x/exp/constraints"
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)
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// Comma add comma to a number value by every 3 numbers from right. ahead by symbol char.
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// if value is invalid number string eg "aa", return empty string
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// Comma("12345", "$") => "$12,345", Comma(12345, "$") => "$12,345"
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// Play: https://go.dev/play/p/eRD5k2vzUVX
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func Comma[T constraints.Float | constraints.Integer | string](value T, symbol string) string {
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// s, err := numberToString(value)
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// if err != nil {
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// return ""
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// }
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// dotIndex := strings.Index(s, ".")
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// if dotIndex != -1 {
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// return symbol + commaString(s[:dotIndex]) + s[dotIndex:]
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// }
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// return symbol + commaString(s)
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return ""
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}
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// func commaString(s string) string {
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// if len(s) <= 3 {
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// return s
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// }
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// return commaString(s[:len(s)-3]) + "," + commaString(s[len(s)-3:])
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// }
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// func numberToString(value any) (string, error) {
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// switch reflect.TypeOf(value).Kind() {
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// case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64,
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// reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
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// return fmt.Sprintf("%v", value), nil
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// // todo: need to handle 12345678.9 => 1.23456789e+07
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// case reflect.Float32, reflect.Float64:
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// return fmt.Sprintf("%v", value), nil
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// case reflect.String:
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// {
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// sv := fmt.Sprintf("%v", value)
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// if strings.Contains(sv, ".") {
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// _, err := strconv.ParseFloat(sv, 64)
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// if err != nil {
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// return "", err
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// }
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// return sv, nil
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// } else {
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// _, err := strconv.ParseInt(sv, 10, 64)
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// if err != nil {
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// return "", nil
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// }
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// return sv, nil
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// }
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// }
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// default:
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// return "", nil
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// }
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// }
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