511 lines
12 KiB
Go
511 lines
12 KiB
Go
package reflect // import "go.unistack.org/micro/v3/util/reflect"
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import (
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"errors"
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"fmt"
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"reflect"
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"strconv"
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"strings"
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"unicode"
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)
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var (
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// ErrInvalidStruct happens when passed not struct and not struct pointer
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ErrInvalidStruct = errors.New("invalid struct specified")
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// ErrInvalidValue happens when passed invalid value for field
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ErrInvalidValue = errors.New("invalid value specified")
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// ErrNotFound happens when struct field not found
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ErrNotFound = errors.New("struct field not found")
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)
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// Option func signature
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type Option func(*Options)
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// Options for merge
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type Options struct {
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// Tags specifies tags to lookup
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Tags []string
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// SliceAppend controls slice appending
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SliceAppend bool
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}
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// Tags sets the merge tags for lookup
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func Tags(t []string) Option {
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return func(o *Options) {
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o.Tags = t
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}
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}
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// SliceAppend sets the option
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func SliceAppend(b bool) Option {
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return func(o *Options) {
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o.SliceAppend = b
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}
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}
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// Merge merges map[string]interface{} to destination struct
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func Merge(dst interface{}, mp map[string]interface{}, opts ...Option) error {
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var err error
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var sval reflect.Value
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var fname string
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options := Options{}
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for _, o := range opts {
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o(&options)
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}
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dviface := reflect.ValueOf(dst)
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if dviface.Kind() == reflect.Ptr {
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dviface = dviface.Elem()
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}
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if dviface.Kind() != reflect.Struct {
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return ErrInvalidStruct
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}
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dtype := dviface.Type()
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for idx := 0; idx < dtype.NumField(); idx++ {
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dfld := dtype.Field(idx)
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dval := dviface.Field(idx)
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if !dval.CanSet() || len(dfld.PkgPath) != 0 || !dval.IsValid() {
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continue
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}
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fname = ""
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for _, tname := range options.Tags {
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tvalue, ok := dfld.Tag.Lookup(tname)
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if !ok {
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continue
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}
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tpart := strings.Split(tvalue, ",")
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switch tname {
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case "protobuf":
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for _, p := range tpart {
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if idx := strings.Index(p, "name="); idx > 0 {
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fname = p[idx:]
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}
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}
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default:
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fname = tpart[0]
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}
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if fname != "" {
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break
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}
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}
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if fname == "" {
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fname = FieldName(dfld.Name)
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}
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val, ok := mp[fname]
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if !ok {
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val, ok = mp[dfld.Name]
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if !ok {
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continue
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}
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}
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sval = reflect.ValueOf(val)
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switch getKind(dval) {
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case reflect.Bool:
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err = mergeBool(dval, sval)
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case reflect.String:
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err = mergeString(dval, sval)
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case reflect.Int:
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err = mergeInt(dval, sval)
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case reflect.Uint:
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err = mergeUint(dval, sval)
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case reflect.Float32:
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err = mergeFloat(dval, sval)
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case reflect.Struct:
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mp, ok := sval.Interface().(map[string]interface{})
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if !ok {
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return ErrInvalidValue
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}
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err = Merge(dval.Interface(), mp, opts...)
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case reflect.Ptr:
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mp, ok := sval.Interface().(map[string]interface{})
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if !ok {
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return ErrInvalidValue
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}
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if dval.IsNil() {
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dval.Set(reflect.New(dval.Type().Elem()))
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if dval.Elem().Type().Kind() == reflect.Struct {
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for i := 0; i < dval.Elem().NumField(); i++ {
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field := dval.Elem().Field(i)
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if field.Type().Kind() == reflect.Ptr && field.IsNil() && dval.Elem().Type().Field(i).Anonymous {
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field.Set(reflect.New(field.Type().Elem()))
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}
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}
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}
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}
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err = Merge(dval.Interface(), mp, opts...)
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case reflect.Slice:
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if !options.SliceAppend && dval.IsNil() {
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dval.Set(reflect.MakeSlice(dval.Type(), sval.Len(), sval.Len()))
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} else if options.SliceAppend && dval.IsNil() {
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dval.Set(reflect.MakeSlice(dval.Type(), 0, 0))
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}
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for idx := 0; idx < sval.Len(); idx++ {
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var idval reflect.Value
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if !options.SliceAppend {
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idval = dval.Index(idx)
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} else {
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idval = reflect.Indirect(reflect.New(dval.Type().Elem()))
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}
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if getKind(idval) == reflect.Ptr && idval.IsNil() {
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idval.Set(reflect.New(idval.Type().Elem()))
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if idval.Elem().Type().Kind() == reflect.Struct {
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for i := 0; i < idval.Elem().NumField(); i++ {
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field := idval.Elem().Field(i)
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if field.Type().Kind() == reflect.Ptr && field.IsNil() && idval.Elem().Type().Field(i).Anonymous {
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field.Set(reflect.New(field.Type().Elem()))
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}
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}
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}
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}
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switch getKind(idval) {
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case reflect.Bool:
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err = mergeBool(idval, sval.Index(idx))
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case reflect.String:
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err = mergeString(idval, sval.Index(idx))
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case reflect.Int:
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err = mergeInt(idval, sval.Index(idx))
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case reflect.Uint:
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err = mergeUint(idval, sval.Index(idx))
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case reflect.Float32:
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err = mergeFloat(idval, sval.Index(idx))
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case reflect.Struct:
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imp, ok := sval.Index(idx).Interface().(map[string]interface{})
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if !ok {
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return ErrInvalidValue
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}
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err = Merge(idval.Interface(), imp, opts...)
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case reflect.Ptr:
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nsval := sval.Index(idx)
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if getKind(sval.Index(idx)) == reflect.Interface {
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nsval = reflect.ValueOf(nsval.Interface())
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}
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switch reflect.Indirect(idval).Type().String() {
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case "wrapperspb.BoolValue":
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if eva := reflect.Indirect(idval).FieldByName("Value"); eva.IsValid() {
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err = mergeBool(eva, nsval)
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}
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case "wrapperspb.BytesValue":
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if eva := reflect.Indirect(idval).FieldByName("Value"); eva.IsValid() {
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err = mergeUint(eva, nsval)
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}
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case "wrapperspb.DoubleValue", "wrapperspb.FloatValue":
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if eva := reflect.Indirect(idval).FieldByName("Value"); eva.IsValid() {
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err = mergeFloat(eva, nsval)
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}
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case "wrapperspb.Int32Value", "wrapperspb.Int64Value":
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if eva := reflect.Indirect(idval).FieldByName("Value"); eva.IsValid() {
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err = mergeInt(eva, nsval)
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}
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case "wrapperspb.StringValue":
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if eva := reflect.Indirect(idval).FieldByName("Value"); eva.IsValid() {
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err = mergeString(eva, nsval)
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}
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case "wrapperspb.UInt32Value", "wrapperspb.UInt64Value":
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if eva := reflect.Indirect(idval).FieldByName("Value"); eva.IsValid() {
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err = mergeUint(eva, nsval)
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}
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default:
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imp, ok := nsval.Interface().(map[string]interface{})
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if !ok {
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return ErrInvalidValue
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}
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if idval.IsNil() {
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idval.Set(reflect.New(idval.Type().Elem()))
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if idval.Elem().Type().Kind() == reflect.Struct {
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for i := 0; i < idval.Elem().NumField(); i++ {
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field := idval.Elem().Field(i)
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if field.Type().Kind() == reflect.Ptr && field.IsNil() && idval.Elem().Type().Field(i).Anonymous {
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field.Set(reflect.New(field.Type().Elem()))
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}
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}
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}
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}
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err = Merge(idval.Interface(), imp, opts...)
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}
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}
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if options.SliceAppend {
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dval.Set(reflect.Append(dval, idval))
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}
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}
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/*
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case reflect.Interface:
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err = d.decodeBasic(name, input, outVal)
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case reflect.Map:
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err = merge(dval, sval)
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case reflect.Array:
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err = mergeArray(dval, sval)
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*/
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default:
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err = ErrInvalidValue
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}
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if err != nil {
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err = fmt.Errorf("%v key %v invalid val %v", err, fname, sval.Interface())
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}
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}
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return nil
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}
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func mergeBool(dval reflect.Value, sval reflect.Value) error {
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switch getKind(sval) {
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case reflect.Int:
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switch sval.Int() {
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case 1:
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dval.SetBool(true)
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case 0:
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dval.SetBool(false)
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default:
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return ErrInvalidValue
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}
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case reflect.Uint:
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switch sval.Uint() {
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case 1:
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dval.SetBool(true)
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case 0:
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dval.SetBool(false)
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default:
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return ErrInvalidValue
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}
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case reflect.Float32:
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switch sval.Float() {
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case 1:
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dval.SetBool(true)
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case 0:
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dval.SetBool(false)
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default:
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return ErrInvalidValue
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}
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case reflect.Bool:
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dval.SetBool(sval.Bool())
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case reflect.String:
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switch sval.String() {
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case "t", "T", "true", "TRUE", "True", "1", "yes":
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dval.SetBool(true)
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case "f", "F", "false", "FALSE", "False", "0", "no":
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dval.SetBool(false)
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default:
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return ErrInvalidValue
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}
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case reflect.Interface:
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return mergeBool(dval, reflect.ValueOf(fmt.Sprintf("%v", sval.Interface())))
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default:
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return ErrInvalidValue
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}
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return nil
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}
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func mergeString(dval reflect.Value, sval reflect.Value) error {
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switch getKind(sval) {
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case reflect.Int:
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dval.SetString(strconv.FormatInt(sval.Int(), sval.Type().Bits()))
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case reflect.Uint:
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dval.SetString(strconv.FormatUint(sval.Uint(), sval.Type().Bits()))
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case reflect.Float32:
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dval.SetString(strconv.FormatFloat(sval.Float(), 'f', -1, sval.Type().Bits()))
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case reflect.Bool:
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switch sval.Bool() {
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case true:
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dval.SetString(strconv.FormatBool(true))
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case false:
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dval.SetString(strconv.FormatBool(false))
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}
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case reflect.String:
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dval.SetString(sval.String())
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case reflect.Interface:
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return mergeString(dval, reflect.ValueOf(fmt.Sprintf("%v", sval.Interface())))
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default:
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return ErrInvalidValue
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}
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return nil
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}
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func mergeInt(dval reflect.Value, sval reflect.Value) error {
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switch getKind(sval) {
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case reflect.Int:
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dval.SetInt(sval.Int())
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case reflect.Uint:
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dval.SetInt(int64(sval.Uint()))
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case reflect.Float32:
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dval.SetInt(int64(sval.Float()))
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case reflect.Bool:
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switch sval.Bool() {
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case true:
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dval.SetInt(1)
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case false:
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dval.SetInt(0)
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}
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case reflect.String:
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l, err := strconv.ParseInt(sval.String(), 0, dval.Type().Bits())
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if err != nil {
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return err
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}
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dval.SetInt(l)
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case reflect.Interface:
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return mergeInt(dval, reflect.ValueOf(fmt.Sprintf("%v", sval.Interface())))
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default:
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return ErrInvalidValue
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}
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return nil
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}
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func mergeUint(dval reflect.Value, sval reflect.Value) error {
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switch getKind(sval) {
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case reflect.Int:
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dval.SetUint(uint64(sval.Int()))
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case reflect.Uint:
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dval.SetUint(sval.Uint())
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case reflect.Float32:
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dval.SetUint(uint64(sval.Float()))
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case reflect.Bool:
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switch sval.Bool() {
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case true:
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dval.SetUint(1)
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case false:
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dval.SetUint(0)
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}
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case reflect.String:
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l, err := strconv.ParseUint(sval.String(), 0, dval.Type().Bits())
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if err != nil {
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return err
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}
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dval.SetUint(l)
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case reflect.Interface:
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return mergeUint(dval, reflect.ValueOf(fmt.Sprintf("%v", sval.Interface())))
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default:
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return ErrInvalidValue
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}
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return nil
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}
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func mergeFloat(dval reflect.Value, sval reflect.Value) error {
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switch getKind(sval) {
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case reflect.Int:
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dval.SetFloat(float64(sval.Int()))
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case reflect.Uint:
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dval.SetFloat(float64(sval.Uint()))
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case reflect.Float32:
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dval.SetFloat(sval.Float())
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case reflect.Bool:
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switch sval.Bool() {
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case true:
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dval.SetFloat(1)
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case false:
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dval.SetFloat(0)
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}
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case reflect.String:
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l, err := strconv.ParseFloat(sval.String(), dval.Type().Bits())
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if err != nil {
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return err
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}
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dval.SetFloat(l)
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case reflect.Interface:
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return mergeFloat(dval, reflect.ValueOf(fmt.Sprintf("%v", sval.Interface())))
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default:
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return ErrInvalidValue
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}
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return nil
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}
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func getKind(val reflect.Value) reflect.Kind {
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kind := val.Kind()
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switch {
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case kind >= reflect.Int && kind <= reflect.Int64:
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return reflect.Int
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case kind >= reflect.Uint && kind <= reflect.Uint64:
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return reflect.Uint
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case kind >= reflect.Float32 && kind <= reflect.Float64:
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return reflect.Float32
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}
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return kind
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}
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// IsZero returns true if struct is zero (not have any defined values)
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func IsZero(src interface{}) bool {
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v := reflect.ValueOf(src)
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return IsEmpty(v)
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}
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// Zero creates new zero interface
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func Zero(src interface{}) (interface{}, error) {
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sv := reflect.ValueOf(src)
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if sv.Kind() == reflect.Ptr {
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sv = sv.Elem()
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}
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if sv.Kind() == reflect.Invalid {
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return nil, ErrInvalidStruct
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}
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dst := reflect.New(sv.Type())
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return dst.Interface(), nil
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}
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// IsEmpty returns true if value empty
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func IsEmpty(v reflect.Value) bool {
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switch getKind(v) {
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case reflect.Array, reflect.Map, reflect.Slice, reflect.String:
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return v.Len() == 0
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case reflect.Bool:
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return !v.Bool()
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case reflect.Int:
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return v.Int() == 0
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case reflect.Uint:
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return v.Uint() == 0
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case reflect.Float32:
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return v.Float() == 0
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case reflect.Interface, reflect.Ptr:
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if v.IsNil() {
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return true
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}
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return IsEmpty(v.Elem())
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case reflect.Func:
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return v.IsNil()
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case reflect.Invalid:
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return true
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case reflect.Struct:
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var ok bool
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for i := 0; i < v.NumField(); i++ {
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ok = IsEmpty(v.FieldByIndex([]int{i}))
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if !ok {
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return false
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}
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}
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default:
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return false
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}
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return true
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}
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// FieldName returns map field name that can be looked up in struct field
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func FieldName(name string) string {
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newstr := make([]rune, 0, len(name))
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for idx, chr := range name {
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if idx == 0 {
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newstr = append(newstr, unicode.ToLower(chr))
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continue
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} else if unicode.IsUpper(chr) {
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newstr = append(newstr, '_')
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newstr = append(newstr, unicode.ToLower(chr))
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continue
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}
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newstr = append(newstr, chr)
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}
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return string(newstr)
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}
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