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reflect.go
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reflect.go
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package zutil
import (
"errors"
"reflect"
"strconv"
"github.com/sohaha/zlsgo/zreflect"
"github.com/sohaha/zlsgo/ztype"
)
func SetValue(vTypeOf reflect.Kind, vValueOf reflect.Value, value interface{}) (err error) {
typeErr := errors.New(vTypeOf.String() + " type assignment is not supported")
vString := ""
v, ok := value.(string)
if ok {
vString = v
} else {
vString = ztype.ToString(value)
}
switch vTypeOf {
case reflect.String:
vValueOf.SetString(vString)
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
var v int64
v, err = strconv.ParseInt(vString, 10, 64)
if err != nil {
err = errors.New("must be an integer")
} else if vValueOf.OverflowInt(v) {
err = typeErr
}
vValueOf.SetInt(v)
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
var v uint64
v, err = strconv.ParseUint(vString, 10, 64)
if err != nil {
err = errors.New("must be an unsigned integer")
} else if vValueOf.OverflowUint(v) {
err = typeErr
}
vValueOf.SetUint(v)
case reflect.Float32, reflect.Float64:
var v float64
v, err = strconv.ParseFloat(vString, 64)
if err != nil {
err = errors.New("must be decimal")
} else if vValueOf.OverflowFloat(v) {
err = typeErr
}
case reflect.Bool:
var v bool
v, err = strconv.ParseBool(vString)
if err != nil {
err = errors.New("must be boolean")
}
vValueOf.SetBool(v)
case reflect.Slice:
if value != nil {
vValueOf.Set(zreflect.ValueOf(value))
} else {
err = errors.New("must be slice")
}
case reflect.Struct:
err = setStruct(vValueOf, value)
default:
err = typeErr
}
return err
}
// setStruct todo unfinished
func setStruct(v reflect.Value, value interface{}) (err error) {
valueTypeof := reflect.TypeOf(value)
kind := valueTypeof.Kind()
if kind != reflect.Map {
err = errors.New("must be map[]")
return
}
if values, ok := value.(map[string]string); ok {
err = ReflectForNumField(v, func(fieldName, fieldTag string, kind reflect.Kind,
field reflect.Value) error {
if v, ok := values[fieldTag]; ok {
return SetValue(kind, field, v)
}
return nil
})
} else {
err = errors.New("not supported")
}
return
}
func ReflectStructField(v reflect.Type, fn func(
numField int, fieldTag string, field reflect.StructField) error, tag ...string) error {
var err error
tagKey := "z"
if len(tag) > 0 {
tagKey = tag[0]
}
if v.Kind() == reflect.Ptr {
v = v.Elem()
}
for i := 0; i < v.NumField(); i++ {
field := v.Field(i)
fieldTag := ""
if tagKey != "" {
fieldTag = field.Tag.Get(tagKey)
}
if fieldTag == "-" {
continue
}
fieldName := field.Name
if fieldTag == "" {
fieldTag = fieldName
}
err = fn(i, fieldTag, field)
if err != nil {
return err
}
}
return nil
}
func ReflectForNumField(v reflect.Value, fn func(fieldName, fieldTag string,
kind reflect.Kind, field reflect.Value) error, tag ...string) error {
var err error
tagKey := zreflect.Tag
if len(tag) > 0 {
tagKey = tag[0]
}
for i := 0; i < v.NumField(); i++ {
field := v.Field(i)
tfield := v.Type().Field(i)
fieldTag := ""
if tagKey != "" {
fieldTag = tfield.Tag.Get(tagKey)
}
if fieldTag == "-" || !field.CanSet() {
continue
}
fieldName := tfield.Name
fieldType := field.Type()
kind := fieldType.Kind()
if fieldTag == "" {
fieldTag = fieldName
}
if kind == reflect.Struct { // && tfield.Anonymous
if err = ReflectForNumField(field, fn, tag...); err != nil {
return err
}
}
if err = fn(fieldName, fieldTag, kind, field); err != nil {
return err
}
}
return err
}
// GetAllMethod get all methods of struct
func GetAllMethod(s interface{}, fn func(numMethod int, m reflect.Method) error) error {
typ := zreflect.ValueOf(s)
if fn == nil {
return nil
}
return zreflect.ForEachMethod(typ, func(index int, method reflect.Method, value reflect.Value) error {
return fn(index, method)
})
}
// RunAllMethod run all methods of struct
func RunAllMethod(st interface{}, args ...interface{}) (err error) {
return RunAssignMethod(st, func(methodName string) bool {
return true
}, args...)
}
// RunAssignMethod run assign methods of struct
func RunAssignMethod(st interface{}, filter func(methodName string) bool, args ...interface{}) (err error) {
valueOf := zreflect.ValueOf(st)
err = GetAllMethod(st, func(numMethod int, m reflect.Method) error {
if !filter(m.Name) {
return nil
}
var values []reflect.Value
for _, v := range args {
values = append(values, zreflect.ValueOf(v))
}
return TryCatch(func() error {
valueOf.Method(numMethod).Call(values)
return nil
})
})
return
}