gowechat/util/string.go

package util

import (
	"fmt"
	"math/rand"
	"reflect"
	"strconv"
	"time"
)

//RandomStr 随机生成字符串
func RandomStr(length int) string {
	str := "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
	bytes := []byte(str)
	result := []byte{}
	r := rand.New(rand.NewSource(time.Now().UnixNano()))
	for i := 0; i < length; i++ {
		result = append(result, bytes[r.Intn(len(bytes))])
	}
	return string(result)
}

// convert string to specify type

type StrTo string

func (f *StrTo) Set(v string) {
	if v != "" {
		*f = StrTo(v)
	} else {
		f.Clear()
	}
}

func (f *StrTo) Clear() {
	*f = StrTo(0x1E)
}

func (f StrTo) Exist() bool {
	return string(f) != string(0x1E)
}

func (f StrTo) Bool() (bool, error) {
	if f == "on" {
		return true, nil
	}
	return strconv.ParseBool(f.String())
}

func (f StrTo) Float32() (float32, error) {
	v, err := strconv.ParseFloat(f.String(), 32)
	return float32(v), err
}

func (f StrTo) Float64() (float64, error) {
	return strconv.ParseFloat(f.String(), 64)
}

func (f StrTo) Int() (int, error) {
	v, err := strconv.ParseInt(f.String(), 10, 32)
	return int(v), err
}

func (f StrTo) Int8() (int8, error) {
	v, err := strconv.ParseInt(f.String(), 10, 8)
	return int8(v), err
}

func (f StrTo) Int16() (int16, error) {
	v, err := strconv.ParseInt(f.String(), 10, 16)
	return int16(v), err
}

func (f StrTo) Int32() (int32, error) {
	v, err := strconv.ParseInt(f.String(), 10, 32)
	return int32(v), err
}

func (f StrTo) Int64() (int64, error) {
	v, err := strconv.ParseInt(f.String(), 10, 64)
	return int64(v), err
}

func (f StrTo) Uint() (uint, error) {
	v, err := strconv.ParseUint(f.String(), 10, 32)
	return uint(v), err
}

func (f StrTo) Uint8() (uint8, error) {
	v, err := strconv.ParseUint(f.String(), 10, 8)
	return uint8(v), err
}

func (f StrTo) Uint16() (uint16, error) {
	v, err := strconv.ParseUint(f.String(), 10, 16)
	return uint16(v), err
}

func (f StrTo) Uint32() (uint32, error) {
	v, err := strconv.ParseUint(f.String(), 10, 32)
	return uint32(v), err
}

func (f StrTo) Uint64() (uint64, error) {
	v, err := strconv.ParseUint(f.String(), 10, 64)
	return uint64(v), err
}

func (f StrTo) String() string {
	if f.Exist() {
		return string(f)
	}
	return ""
}

// convert any type to string
func ToStr(value interface{}, args ...int) (s string) {
	switch v := value.(type) {
	case bool:
		s = strconv.FormatBool(v)
	case float32:
		s = strconv.FormatFloat(float64(v), 'f', argInt(args).Get(0, -1), argInt(args).Get(1, 32))
	case float64:
		s = strconv.FormatFloat(v, 'f', argInt(args).Get(0, -1), argInt(args).Get(1, 64))
	case int:
		s = strconv.FormatInt(int64(v), argInt(args).Get(0, 10))
	case int8:
		s = strconv.FormatInt(int64(v), argInt(args).Get(0, 10))
	case int16:
		s = strconv.FormatInt(int64(v), argInt(args).Get(0, 10))
	case int32:
		s = strconv.FormatInt(int64(v), argInt(args).Get(0, 10))
	case int64:
		s = strconv.FormatInt(v, argInt(args).Get(0, 10))
	case uint:
		s = strconv.FormatUint(uint64(v), argInt(args).Get(0, 10))
	case uint8:
		s = strconv.FormatUint(uint64(v), argInt(args).Get(0, 10))
	case uint16:
		s = strconv.FormatUint(uint64(v), argInt(args).Get(0, 10))
	case uint32:
		s = strconv.FormatUint(uint64(v), argInt(args).Get(0, 10))
	case uint64:
		s = strconv.FormatUint(v, argInt(args).Get(0, 10))
	case string:
		s = v
	case []byte:
		s = string(v)
	default:
		s = fmt.Sprintf("%v", v)
	}
	return s
}

// convert any numeric value to int64
func ToInt64(value interface{}) (d int64, err error) {
	val := reflect.ValueOf(value)
	switch value.(type) {
	case int, int8, int16, int32, int64:
		d = val.Int()
	case uint, uint8, uint16, uint32, uint64:
		d = int64(val.Uint())
	default:
		err = fmt.Errorf("ToInt64 need numeric not `%T`", value)
	}
	return
}

type argString []string

func (a argString) Get(i int, args ...string) (r string) {
	if i >= 0 && i < len(a) {
		r = a[i]
	} else if len(args) > 0 {
		r = args[0]
	}
	return
}

type argInt []int

func (a argInt) Get(i int, args ...int) (r int) {
	if i >= 0 && i < len(a) {
		r = a[i]
	}
	if len(args) > 0 {
		r = args[0]
	}
	return
}

type argAny []interface{}

func (a argAny) Get(i int, args ...interface{}) (r interface{}) {
	if i >= 0 && i < len(a) {
		r = a[i]
	}
	if len(args) > 0 {
		r = args[0]
	}
	return
}