Add StructUtil for provide more rich functions (#79)

* add support json tag attribute for StructToMap function

* add the structutil to provide more rich functions and fixed #77

convertor/convertor.go

@@ -11,9 +11,9 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"github.com/duke-git/lancet/v2/structutil"
 	"math"
 	"reflect"
-	"regexp"
 	"strconv"
 	"strings"
 )
@@ -235,32 +235,7 @@ func ToMap[T any, K comparable, V any](array []T, iteratee func(T) (K, V)) map[K
 // map key is specified same as struct field tag `json` value.
 // Play: https://go.dev/play/p/KYGYJqNUBOI
 func StructToMap(value any) (map[string]any, error) {
-	v := reflect.ValueOf(value)
-	t := reflect.TypeOf(value)
-
-	if t.Kind() == reflect.Ptr {
-		t = t.Elem()
-	}
-	if t.Kind() != reflect.Struct {
-		return nil, fmt.Errorf("data type %T not support, shuld be struct or pointer to struct", value)
-	}
-
-	result := make(map[string]any)
-
-	fieldNum := t.NumField()
-	pattern := `^[A-Z]`
-	regex := regexp.MustCompile(pattern)
-	for i := 0; i < fieldNum; i++ {
-		name := t.Field(i).Name
-		tag := t.Field(i).Tag.Get("json")
-		if tag == "" || strings.HasPrefix(tag, "-") || !regex.MatchString(name) {
-			continue
-		}
-		tag = strings.Split(tag, ",")[0]
-		result[tag] = v.Field(i).Interface()
-	}
-
-	return result, nil
+	return structutil.ToMap(value)
 }
 
 // MapToSlice convert map to slice based on iteratee function.

convertor/convertor_test.go

@@ -180,7 +180,7 @@ func TestToMap(t *testing.T) {
 func TestStructToMap(t *testing.T) {
 	assert := internal.NewAssert(t, "TestStructToMap")
 
-	t.Run("StructToMap", func(t *testing.T) {
+	t.Run("StructToMap", func(_ *testing.T) {
 		type People struct {
 			Name string `json:"name"`
 			age  int
@@ -194,7 +194,7 @@ func TestStructToMap(t *testing.T) {
 		assert.Equal(expected, pm)
 	})
 
-	t.Run("StructToMapWithJsonAttr", func(t *testing.T) {
+	t.Run("StructToMapWithJsonAttr", func(_ *testing.T) {
 		type People struct {
 			Name  string `json:"name,omitempty"` // json tag with attribute
 			Phone string `json:"phone"`          // json tag without attribute
@@ -202,13 +202,12 @@ func TestStructToMap(t *testing.T) {
 			age   int    // no tag
 		}
 		p := People{
-			"test",
-			"1111",
-			"male",
-			100,
+			Phone: "1111",
+			Sex:   "male",
+			age:   100,
 		}
 		pm, _ := StructToMap(p)
-		var expected = map[string]any{"name": "test", "phone": "1111"}
+		var expected = map[string]any{"phone": "1111"}
 		assert.Equal(expected, pm)
 	})
 }