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bind.go
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bind.go
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package zvalid
import (
"errors"
"fmt"
"reflect"
"strconv"
"strings"
)
// ValidEle ValidEle
type ValidEle struct {
target interface{}
source Engine
}
// Silent an error occurred during filtering, no error is returned
func (v Engine) Silent() Engine {
v.silent = true
return v
}
// Default if a filtering error occurs, the default value is assigned to the variable
func (v Engine) Default(value interface{}) Engine {
return pushQueue(&v, func(v *Engine) *Engine {
v.defaultValue = value
return v
}, true)
}
// Separator specify the separator of the slice type
func (v Engine) Separator(sep string) Engine {
if v.err != nil || v.value == "" {
return v
}
v.sep = sep
return v
}
// BatchError multiple error
func BatchError(rules ...Engine) error {
for i := range rules {
err := rules[i].Error()
if err != nil {
return err
}
}
return nil
}
// Batch assign multiple filtered results to the specified object
func Batch(elements ...*ValidEle) error {
for k := range elements {
e := elements[k]
if e == nil {
return nil
}
err := Var(e.target, e.source)
if err != nil {
return err
}
}
return nil
}
// BatchVar assign the filtered result to the specified variable
func BatchVar(target interface{}, source Engine) *ValidEle {
return &ValidEle{
target: target,
source: source,
}
}
// Var assign the filtered result to the specified variable
func Var(target interface{}, source Engine, name ...string) error {
source = *source.valid()
if len(name) > 0 {
source.name = name[0]
}
if source.err != nil && source.defaultValue == nil {
if source.silent {
return nil
}
return source.err
}
var (
val reflect.Value
k reflect.Kind
)
val, ok := target.(reflect.Value)
if !ok {
val = reflect.ValueOf(target)
if val.Kind() != reflect.Ptr {
if source.silent {
return nil
}
return fmt.Errorf("parameter must pass in a pointer type: %s", source.name)
}
if !val.Elem().CanSet() {
if source.silent {
return nil
}
return fmt.Errorf("target value of the variable cannot be changed: %s", source.name)
}
val = val.Elem()
k = val.Type().Kind()
} else {
k = val.Type().Kind()
}
if source.err == nil && source.value != "" {
source.err = setRawValue(k, val, source.value, source.sep)
}
if source.err != nil && source.defaultValue != nil {
if err := setDefaultValue(k, val, source.defaultValue); err != nil {
if source.silent {
return nil
}
return err
}
return nil
} else if source.err != nil {
if source.silent {
return nil
}
return errors.New(source.name + source.err.Error())
}
return nil
}
func setRawValue(k reflect.Kind, val reflect.Value, value string, sep string) error {
typeErr := errors.New("不能用" + k.String() + "类型赋值")
switch k {
case reflect.String:
val.SetString(value)
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
v, err := strconv.ParseInt(value, 10, 64)
if err != nil {
return errors.New("必须是整数")
}
if val.OverflowInt(v) {
return typeErr
}
val.SetInt(v)
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
v, err := strconv.ParseUint(value, 10, 64)
if err != nil {
return errors.New("必须是无符号整数")
}
if val.OverflowUint(v) {
return typeErr
}
val.SetUint(v)
case reflect.Float32, reflect.Float64:
v, err := strconv.ParseFloat(value, 64)
if err != nil {
return errors.New("必须是小数")
}
if val.OverflowFloat(v) {
return typeErr
}
val.SetFloat(v)
case reflect.Bool:
v, err := strconv.ParseBool(value)
if err != nil {
return errors.New("必须是布尔值")
}
val.SetBool(v)
case reflect.Slice:
sliceType := val.Type().String()
if sliceType == "[]string" {
if sep == "" {
return errors.New("过滤规则的分隔符参数(sep)未定义")
}
val.Set(reflect.ValueOf(strings.Split(value, sep)))
}
default:
return typeErr
}
return nil
}
func setDefaultValue(targetTypeOf reflect.Kind, targetValueOf reflect.Value, value interface{}) error {
valueTypeOf := reflect.ValueOf(value)
if valueTypeOf.Kind() != targetTypeOf {
return errors.New("值类型默认值类型不相同" + valueTypeOf.String() + "/" + targetTypeOf.String())
}
targetValueOf.Set(valueTypeOf)
return nil
}