u

copier.go

@@ -3,6 +3,7 @@ package copier
 import (
 	"fmt"
 	"reflect"
+	"slices"
 	"strconv"
 	"strings"
 	"sync"
@@ -72,16 +73,14 @@ func (c *copier) deepCopy(dst, src reflect.Value, depth int) error {
 
 	// 可以直接赋值时直接赋值并返回
 	srcType, dstType := src.Type(), dst.Type()
-	// if srcType.AssignableTo(dstType) {
-	// 	dst.Set(src)
-	// 	return nil
-	// }
 
 	// 处理时间类型
 	if isTimeType(srcType) || isTimeType(dstType) {
 		return c.copyTime(dst, src)
 	}
 
+	// fmt.Println("srcType:", srcType, src.Kind().String(), "dstType:", dstType, dst.Kind().String())
+
 	switch src.Kind() {
 	case reflect.Slice, reflect.Array:
 		return c.copySliceOrArray(dst, src, depth)
@@ -102,8 +101,6 @@ func (c *copier) deepCopy(dst, src reflect.Value, depth int) error {
 
 func (c *copier) copySliceOrArray(dst, src reflect.Value, depth int) error {
 	switch dst.Kind() {
-	case reflect.Struct:
-		return c.copyStructToSlice(dst, src, depth)
 	case reflect.Slice, reflect.Array:
 		return c.copySliceToSlice(dst, src, depth)
 	default:
@@ -350,6 +347,8 @@ func (c *copier) copyStruct(dst, src reflect.Value, depth int) error {
 		return c.copyStructToStruct(dst, src, depth)
 	case reflect.Map:
 		return c.copyStructToMap(dst, src, depth)
+	case reflect.Slice:
+		return c.copyStructToSlice(dst, src, depth)
 	default:
 		return ErrNotSupported(src.Type(), dst.Type())
 	}
@@ -361,15 +360,42 @@ func (c *copier) copyStructToStruct(dst, src reflect.Value, depth int) error {
 		return nil
 	}
 
-	fields := c.deepFields(src.Type())
+	srcFields := c.deepFields(src.Type())
-	for _, sf := range fields {
+	dstFields := c.deepFields(dst.Type())
+
+	for _, sf := range dstFields {
+		_ = sf
+	}
+
+	for _, sf := range srcFields {
 		name := c.getFieldName(sf.Field.Name, sf.Tag)
+		sField := src.FieldByName(sf.Field.Name)
+
+		// 是否忽略该字段
+		if c.ignore(sField, name, name, sf.Tag) {
+			continue
+		}
 
 		if nestedAnonymousField(dst, name) {
 			continue
 		}
 
 		dstValue := c.fieldByName(dst, name)
+		if dstValue.IsValid() {
+
+		} else {
+			var toMethod reflect.Value
+			if dst.CanAddr() {
+				toMethod = dst.Addr().MethodByName(name)
+			} else {
+				toMethod = dst.MethodByName(name)
+			}
+
+			if toMethod.IsValid() && toMethod.Type().NumIn() == 1 && toMethod.Type().In(0) == sField.Type() {
+				toMethod.Call([]reflect.Value{sField})
+			}
+		}
+
 		if !dstValue.IsValid() {
 			continue
 		}
@@ -378,11 +404,6 @@ func (c *copier) copyStructToStruct(dst, src reflect.Value, depth int) error {
 			continue
 		}
 
-		sField := src.FieldByName(sf.Field.Name)
-		if c.opt.ignoreEmpty && sField.IsZero() {
-			continue
-		}
-
 		if ok, err := c.lookupAndCopyWithConverter(dstValue, sField, name); err != nil {
 			return err
 		} else if ok {
@@ -393,6 +414,7 @@ func (c *copier) copyStructToStruct(dst, src reflect.Value, depth int) error {
 			return err
 		}
 	}
+
 	return nil
 }
 
@@ -576,62 +598,25 @@ func (c *copier) setBool(dst, src reflect.Value) error {
 	return nil
 }
 
-type fieldsWrapper struct {
+func (c *copier) ignore(field reflect.Value, srcName, dstName string, tag *tagOption) bool {
-	Fields []fieldWrapper
+	// 忽略空值
-	once   sync.Once
+	if tag != nil && tag.Contains(tagIgnore) {
-}
+		return true
-
-type fieldWrapper struct {
-	Field reflect.StructField
-	Tag   *tagOption
-}
-
-var deepFieldsMap sync.Map
-
-func (c *copier) deepFields(reflectType reflect.Type) []fieldWrapper {
-	if wrapper, ok := deepFieldsMap.Load(reflectType); ok {
-		w := wrapper.(*fieldsWrapper)
-		w.once.Do(func() {
-			w.Fields = c.calculateDeepFields(reflectType)
-		})
-		return w.Fields
 	}
 
-	wrapper, loaded := deepFieldsMap.LoadOrStore(reflectType, &fieldsWrapper{})
+	// 忽略空值
-	w := wrapper.(*fieldsWrapper)
+	if c.opt.ignoreEmpty && field.IsZero() {
-	if !loaded {
+		return true
-		w.once.Do(func() {
-			w.Fields = c.calculateDeepFields(reflectType)
-		})
-	} else {
-		w.once.Do(func() {})
 	}
 
-	return w.Fields
+	// 忽略指定字段
-}
+	if c.opt.skipFields != nil {
-
+		if slices.Contains(c.opt.skipFields, srcName) || slices.Contains(c.opt.skipFields, dstName) {
-func (c *copier) calculateDeepFields(reflectType reflect.Type) []fieldWrapper {
+			return true
-	reflectType, _ = indirectType(reflectType)
-	num := reflectType.NumField()
-	res := make([]fieldWrapper, 0, num)
-	if reflectType.Kind() == reflect.Struct {
-		for i := range num {
-			sf := reflectType.Field(i)
-			if sf.PkgPath != "" && !sf.Anonymous {
-				continue
-			}
-
-			tag := parseTag(sf.Tag.Get(c.opt.tagName))
-
-			if sf.Anonymous {
-				res = append(res, c.deepFields(sf.Type)...)
-			} else {
-				res = append(res, fieldWrapper{Field: sf, Tag: tag})
-			}
 		}
 	}
 
-	return res
+	return false
 }
 
 func (c *copier) lookupAndCopyWithConverter(dst, src reflect.Value, fieldName string) (bool, error) {
@@ -952,13 +937,17 @@ func convert(dst, src reflect.Value, fn convertFunc) (bool, error) {
 }
 
 func (c *copier) getFieldName(name string, tag *tagOption) string {
-	if tag != nil && tag.Contains(tagToName) {
+	if tag != nil && tag.Contains(tagName) {
-		return tag.toname
+		return tag.name
 	}
 
 	return c.opt.NameConvert(name)
 }
 
+func (c *copier) getFieldName2(fieldName string, tag *tagOption) (srcFieldName string, dstFieldName string) {
+	return fieldName, c.getFieldName(fieldName, tag)
+}
+
 func (c *copier) fieldByName(v reflect.Value, name string) reflect.Value {
 	if c.opt != nil && c.opt.caseSensitive {
 		return v.FieldByName(name)

copier_map_test.go

@@ -194,7 +194,7 @@ func TestMixMapToStruct(t *testing.T) {
 		Name      string         `json:"name"`
 		Age       int            `json:"age"`
 		Height    float64        `json:"height"`
-		IsStudent bool           `json:"is_student"`
+		IsStudent bool           `json:"is_student" copier:"-"`
 		Birthday  time.Time      `json:"birthday"`
 		Tags      []string       `json:"tags"`
 		Scores    []int          `json:"scores"`

copier_slice_test.go

@@ -2,6 +2,7 @@ package copier
 
 import (
 	"fmt"
+	"reflect"
 	"slices"
 	"testing"
 )
@@ -114,3 +115,55 @@ func TestAppendSlice(t *testing.T) {
 	}
 
 }
+
+func TestCopySliceOfDifferentTypes(t *testing.T) {
+	var ss []string
+	var is []int
+	if err := Copy(&ss, is); err != nil {
+		t.Error(err)
+	}
+	var anotherSs []string
+	if !reflect.DeepEqual(ss, anotherSs) {
+		t.Errorf("Copy nil slice to nil slice should get nil slice")
+	}
+
+	t.Log(ss)
+}
+
+func TestCopyFromStructToSlice(t *testing.T) {
+	user := User{Name: "Jinzhu", Age: 18, Role: "Admin", Notes: []string{"hello world"}}
+	employees := []Employee{}
+
+	if err := Copy(employees, &user); err != nil && len(employees) != 0 {
+		t.Errorf("Copy to unaddressable value should get error")
+	}
+
+	if Copy(&employees, &user); len(employees) != 1 {
+		t.Errorf("Should only have one elem when copy struct to slice")
+	} else {
+		checkEmployee(employees[0], user, t, "Copy From Struct To Slice Ptr")
+	}
+
+	t.Log("ssss", employees)
+
+	employees2 := &[]Employee{}
+	if Copy(&employees2, user); len(*employees2) != 1 {
+		t.Errorf("Should only have one elem when copy struct to slice")
+	} else {
+		checkEmployee((*employees2)[0], user, t, "Copy From Struct To Double Slice Ptr")
+	}
+
+	employees3 := []*Employee{}
+	if Copy(&employees3, user); len(employees3) != 1 {
+		t.Errorf("Should only have one elem when copy struct to slice")
+	} else {
+		checkEmployee(*(employees3[0]), user, t, "Copy From Struct To Ptr Slice Ptr")
+	}
+
+	employees4 := &[]*Employee{}
+	if Copy(&employees4, user); len(*employees4) != 1 {
+		t.Errorf("Should only have one elem when copy struct to slice")
+	} else {
+		checkEmployee(*((*employees4)[0]), user, t, "Copy From Struct To Double Ptr Slice Ptr")
+	}
+}

copier_test.go

@@ -23,10 +23,74 @@ type Person2 struct {
 	Age  int
 }
 
+type User struct {
+	Name     string
+	Birthday *time.Time
+	Nickname string
+	Role     string
+	Age      int32
+	FakeAge  *int32
+	Notes    []string
+	flags    []byte
+}
+
+func (user User) DoubleAge() int32 {
+	return 2 * user.Age
+}
+
 type Employee struct {
-	Name    string
+	_User     *User
-	Age     int
+	Name      string
-	Address *Address
+	Birthday  *time.Time
+	NickName  *string
+	Age       int64
+	FakeAge   int
+	EmployeID int64
+	DoubleAge int32
+	SuperRule string
+	Notes     []*string
+	flags     []byte
+}
+
+func checkEmployee(employee Employee, user User, t *testing.T, testCase string) {
+	if employee.Name != user.Name {
+		t.Errorf("%v: Name haven't been copied correctly.", testCase)
+	}
+	if employee.NickName == nil || *employee.NickName != user.Nickname {
+		t.Errorf("%v: NickName haven't been copied correctly.", testCase)
+	}
+	if employee.Birthday == nil && user.Birthday != nil {
+		t.Errorf("%v: Birthday haven't been copied correctly.", testCase)
+	}
+	if employee.Birthday != nil && user.Birthday == nil {
+		t.Errorf("%v: Birthday haven't been copied correctly.", testCase)
+	}
+	if employee.Birthday != nil && user.Birthday != nil &&
+		!employee.Birthday.Equal(*(user.Birthday)) {
+		t.Errorf("%v: Birthday haven't been copied correctly.", testCase)
+	}
+	if employee.Age != int64(user.Age) {
+		t.Errorf("%v: Age haven't been copied correctly.", testCase)
+	}
+	if user.FakeAge != nil && employee.FakeAge != int(*user.FakeAge) {
+		t.Errorf("%v: FakeAge haven't been copied correctly.", testCase)
+	}
+	if employee.DoubleAge != user.DoubleAge() {
+		t.Errorf("%v: Copy from method doesn't work", testCase)
+	}
+	if employee.SuperRule != "Super "+user.Role {
+		t.Errorf("%v: Copy to method doesn't work", testCase)
+	}
+
+	if len(employee.Notes) != len(user.Notes) {
+		t.Fatalf("%v: Copy from slice doesn't work, employee notes len: %v, user: %v", testCase, len(employee.Notes), len(user.Notes))
+	}
+
+	for idx, note := range user.Notes {
+		if note != *employee.Notes[idx] {
+			t.Fatalf("%v: Copy from slice doesn't work, notes idx: %v employee: %v user: %v", testCase, idx, *employee.Notes[idx], note)
+		}
+	}
 }
 
 func TestCopySameStruct(t *testing.T) {
@@ -305,10 +369,6 @@ func BenchmarkCopy(b *testing.B) {
 	var emp = Employee{
 		Name: "John",
 		Age:  30,
-		Address: &Address{
-			Country: "USA",
-			City:    "New York",
-		},
 	}
 
 	for b.Loop() {
@@ -329,3 +389,47 @@ func BenchmarkDeepFields(b *testing.B) {
 	}
 
 }
+
+func TestEmbeddedAndBase(t *testing.T) {
+	type Base struct {
+		BaseField1 int
+		BaseField2 int
+		User       *User
+	}
+
+	type Embed struct {
+		EmbedField1 int
+		EmbedField2 int
+		Base
+	}
+
+	base := Base{}
+	embedded := Embed{}
+	embedded.BaseField1 = 1
+	embedded.BaseField2 = 2
+	embedded.EmbedField1 = 3
+	embedded.EmbedField2 = 4
+
+	user := User{
+		Name: "testName",
+	}
+	embedded.User = &user
+
+	Copy(&base, &embedded)
+
+	if base.BaseField1 != 1 || base.User.Name != "testName" {
+		t.Error("Embedded fields not copied")
+	}
+
+	base.BaseField1 = 11
+	base.BaseField2 = 12
+	user1 := User{
+		Name: "testName1",
+	}
+	base.User = &user1
+
+	Copy(&embedded, &base)
+	if embedded.BaseField1 != 11 || embedded.User.Name != "testName1" {
+		t.Error("base fields not copied")
+	}
+}

deep_field.go

@@ -0,0 +1,79 @@
+package copier
+
+import (
+	"reflect"
+	"sync"
+)
+
+type fieldsWrapper struct {
+	Fields []fieldWrapper
+	once   sync.Once
+}
+
+type fieldWrapper struct {
+	Field  reflect.StructField
+	Name   string
+	Format string
+	Tag    *tagOption
+}
+
+// type deepFieldCopier struct {
+// 	srcFields []fieldWrapper
+// 	dstFields []fieldWrapper
+// }
+
+var deepFieldsMap sync.Map
+
+func (c *copier) deepFields(reflectType reflect.Type) []fieldWrapper {
+	if wrapper, ok := deepFieldsMap.Load(reflectType); ok {
+		w := wrapper.(*fieldsWrapper)
+		w.once.Do(func() {
+			w.Fields = c.calculateDeepFields(reflectType)
+		})
+		return w.Fields
+	}
+
+	wrapper, loaded := deepFieldsMap.LoadOrStore(reflectType, &fieldsWrapper{})
+	w := wrapper.(*fieldsWrapper)
+	if !loaded {
+		w.once.Do(func() {
+			w.Fields = c.calculateDeepFields(reflectType)
+		})
+	} else {
+		w.once.Do(func() {})
+	}
+
+	return w.Fields
+}
+
+func (c *copier) calculateDeepFields(reflectType reflect.Type) []fieldWrapper {
+	reflectType, _ = indirectType(reflectType)
+	num := reflectType.NumField()
+	res := make([]fieldWrapper, 0, num)
+	if reflectType.Kind() == reflect.Struct {
+		for i := range num {
+			sf := reflectType.Field(i)
+			if sf.PkgPath != "" && !sf.Anonymous {
+				continue
+			}
+
+			tag := parseTag(sf.Tag.Get(c.opt.tagName))
+			if tag.Contains(tagIgnore) {
+				continue
+			}
+
+			if sf.Anonymous {
+				res = append(res, c.deepFields(sf.Type)...)
+			} else {
+				name := sf.Name
+				if tag.Contains(tagName) {
+					name = tag.name
+				}
+
+				res = append(res, fieldWrapper{Field: sf, Tag: tag, Name: name})
+			}
+		}
+	}
+
+	return res
+}

tags.go

@@ -11,15 +11,17 @@ type tagt uint8
 const (
 	tagMust tagt = 1 << iota
 	tagIgnore
-	tagToName
+	tagName
+	tagFormat
 )
 
 // 标签 copier 取值 must、ignore、toname 等
-// copier:"must,toname=xxx" 必须复制，并重命名为 xxx
+// copier:"must,name=xxx" 必须复制，并重命名为 xxx
 
 type tagOption struct {
 	flg    tagt
-	toname string
+	name   string
+	format string
 }
 
 func parseTag(tag string) *tagOption {
@@ -28,15 +30,22 @@ func parseTag(tag string) *tagOption {
 	flg := tagt(0)
 	for t := range strings.SplitSeq(tag, ",") {
 		tag, value, found := strings.Cut(t, "=")
-		switch tag {
+		lower := strings.ToLower(tag)
+
+		switch lower {
 		case "-", "ignore":
 			flg |= tagIgnore
 		case "must":
 			flg |= tagMust
-		case "toname":
+		case "name":
-			flg |= tagToName
+			flg |= tagName
 			if found {
-				opt.toname = value
+				opt.name = value
+			}
+		case "format":
+			flg |= tagFormat
+			if found {
+				opt.format = value
 			}
 		}
 	}

tags_test.go

@@ -0,0 +1,31 @@
+package copier
+
+import (
+	"reflect"
+	"testing"
+	"time"
+)
+
+func TestTags(t *testing.T) {
+
+	type TagTest struct {
+		Tag time.Time `copier:"must,name=xxx,format=2006-01-02 15:04:05" json:"-"`
+	}
+
+	tag := parseTag("must,name=xxx,format=2006-01-02 15:04:05")
+	if !tag.Contains(tagFormat) {
+		t.Error("tag format should not be in tag")
+	}
+
+	typ := reflect.TypeOf(TagTest{})
+	t.Log(typ.NumMethod())
+
+	for i, n := 0, typ.NumField(); i < n; i++ {
+		sf := typ.Field(i)
+		str := sf.Tag.Get("copier")
+		tag = parseTag(str)
+
+		t.Log(tag)
+	}
+
+}