value func
简称: vf
结构体字段绑定函数
通过 标签,为结构体中的每个字段提供对应的函数。 函数可以是修改,检测,通知,过滤,记录。。。。
install
go get github.com/zangdale/valuefunc
demo
import (
"fmt"
"log"
"reflect"
"strconv"
"github.com/zangdale/valuefunc"
)
func main(){
AddString("name", func(s string, isNil bool, args string) (msg string, err error) {
if isNil {
return args, fmt.Errorf("not nil")
}
fmt.Println("name", s, args)
if s == "Hello" {
return args, fmt.Errorf("not same %s", s)
}
return args, nil
})
AddInt("age", func(v int, isNil bool, args string) (msg string, err error) {
if isNil {
return args, fmt.Errorf("not nil")
}
fmt.Println("age", v, args)
if v < 18 {
return args, fmt.Errorf("not big %d", v)
}
return args, nil
})
SetValue("value", func(v reflect.Value, canSet bool, args string) (msg string, err error) {
// 只能更改指针的值 SetInt
log.Println("args: ", args, canSet)
if canSet && v.Kind() == reflect.Int {
i, err := strconv.Atoi(args)
if err != nil {
return "", err
}
v.SetInt(int64(i))
}
return "", nil
})
/////////////////////////////
type Cart struct {
Color int `check:"color"`
Tag string `check:"tag"`
Name_ *string `check:"name"`
Age_ *int `check:"age"`
}
type Presion struct {
Name string `check:"name"`
Age int `check:"value:1000"`
Name_ *string `check:"name"`
Age_ *int `check:"value:99"`
f func()
Struct Cart `check:"-"`
Cart Cart
CartP *Cart
}
name_ := "Hell"
age_ := 18
p := Presion{Name: "H", Age: 19,
Name_: &name_, Age_: &age_,
f: func() {},
Struct: Cart{
Color: 10,
Age_: &age_,
},
Cart: Cart{
Color: 10,
Age_: &age_,
},
CartP: &Cart{
Color: 10,
Tag: "tttg",
}}
msg, err := Check(p)
fmt.Println(msg)
fmt.Println(err)
fmt.Printf("\n%+v\n\n", *p.Age_)
}