From 96818a206e4583859aef3a11c220ed56abe24bf6 Mon Sep 17 00:00:00 2001
From: gazebo <gazeboxu@gmail.com>
Date: Fri, 24 May 2019 16:43:21 +0800
Subject: [PATCH] - utils_reflect

---
 utils/utils_reflect.go      | 59 +++++++++++++++++++++++++++++++++++++
 utils/utils_reflect_test.go | 24 +++++++++++++++
 2 files changed, 83 insertions(+)
 create mode 100644 utils/utils_reflect.go
 create mode 100644 utils/utils_reflect_test.go

diff --git a/utils/utils_reflect.go b/utils/utils_reflect.go
new file mode 100644
index 00000000..56119646
--- /dev/null
+++ b/utils/utils_reflect.go
@@ -0,0 +1,59 @@
+package utils
+
+import (
+	"reflect"
+	"strings"
+)
+
+// 得到一个结构体（或指向结构体的指针）中其成员(tag指定，缺省是字段名)的路径（嵌入结构体或指向结构指针会被展开）
+func GetStructObjNameIndex(obj interface{}, tag string) map[string][]int {
+	objType := reflect.TypeOf(obj)
+	return GetStructNameIndex(objType, tag)
+}
+
+func GetStructNameIndex(objType reflect.Type, tag string) (nameIndex map[string][]int) {
+	if objType.Kind() == reflect.Ptr {
+		objType = objType.Elem()
+	}
+	if objType.Kind() != reflect.Struct {
+		panic("obj must be struct obj or pointer to struct of obj!")
+	}
+	nameIndex = make(map[string][]int)
+	for i := 0; i < objType.NumField(); i++ {
+		structField := objType.Field(i)
+		fieldType := structField.Type
+
+		if IndirectType(fieldType).Kind() == reflect.Struct && IsFieldEmbedded(&structField) { // 嵌入
+			subNameIndex := GetStructNameIndex(fieldType, tag)
+			for k, v := range subNameIndex {
+				nameIndex[k] = append([]int{i}, v...)
+			}
+		} else {
+			tagName := structField.Name
+			if tag != "" {
+				tagName2 := strings.Split(structField.Tag.Get(tag), ",")[0]
+				if tagName2 == "-" {
+					tagName = "" // 忽略
+				} else if tagName2 != "" {
+					tagName = tagName2
+				}
+			}
+			if tagName != "" {
+				nameIndex[tagName] = []int{i}
+			}
+		}
+	}
+	return nameIndex
+}
+
+// 判断成员是否是嵌入的，依据是成员名与类型名相同
+func IsFieldEmbedded(structField *reflect.StructField) bool {
+	return structField.Name == IndirectType(structField.Type).Name()
+}
+
+func IndirectType(objType reflect.Type) reflect.Type {
+	if objType.Kind() == reflect.Ptr {
+		objType = objType.Elem()
+	}
+	return objType
+}
diff --git a/utils/utils_reflect_test.go b/utils/utils_reflect_test.go
new file mode 100644
index 00000000..9398f43a
--- /dev/null
+++ b/utils/utils_reflect_test.go
@@ -0,0 +1,24 @@
+package utils
+
+import (
+	"reflect"
+	"testing"
+)
+
+func TestReflect(t *testing.T) {
+	type SubXXXX struct {
+		IntData int
+		StrData string
+	}
+	type XXXX struct {
+		SubXXXX
+		A int
+		B string `json:"b"`
+	}
+
+	x := XXXX{}
+	typeX := reflect.TypeOf(x)
+	field := typeX.Field(0)
+	t.Log(IsFieldEmbedded(&field))
+	t.Log(Format4Output(GetStructObjNameIndex(&x, ""), false))
+}