gf/util/gconv/gconv_map.go
2021-10-12 17:52:31 +08:00

394 lines
11 KiB
Go

// Copyright GoFrame Author(https://goframe.org). All Rights Reserved.
//
// This Source Code Form is subject to the terms of the MIT License.
// If a copy of the MIT was not distributed with this file,
// You can obtain one at https://github.com/gogf/gf.
package gconv
import (
"github.com/gogf/gf/v2/internal/json"
"reflect"
"strings"
"github.com/gogf/gf/v2/internal/empty"
"github.com/gogf/gf/v2/internal/utils"
)
// Map converts any variable `value` to map[string]interface{}. If the parameter `value` is not a
// map/struct/*struct type, then the conversion will fail and returns nil.
//
// If `value` is a struct/*struct object, the second parameter `tags` specifies the most priority
// tags that will be detected, otherwise it detects the tags in order of:
// gconv, json, field name.
func Map(value interface{}, tags ...string) map[string]interface{} {
return doMapConvert(value, false, tags...)
}
// MapDeep does Map function recursively, which means if the attribute of `value`
// is also a struct/*struct, calls Map function on this attribute converting it to
// a map[string]interface{} type variable.
// Also see Map.
func MapDeep(value interface{}, tags ...string) map[string]interface{} {
return doMapConvert(value, true, tags...)
}
// doMapConvert implements the map converting.
// It automatically checks and converts json string to map if `value` is string/[]byte.
//
// TODO completely implement the recursive converting for all types, especially the map.
func doMapConvert(value interface{}, recursive bool, tags ...string) map[string]interface{} {
if value == nil {
return nil
}
newTags := StructTagPriority
switch len(tags) {
case 0:
// No need handling.
case 1:
newTags = append(strings.Split(tags[0], ","), StructTagPriority...)
default:
newTags = append(tags, StructTagPriority...)
}
// Assert the common combination of types, and finally it uses reflection.
dataMap := make(map[string]interface{})
switch r := value.(type) {
case string:
// If it is a JSON string, automatically unmarshal it!
if len(r) > 0 && r[0] == '{' && r[len(r)-1] == '}' {
if err := json.UnmarshalUseNumber([]byte(r), &dataMap); err != nil {
return nil
}
} else {
return nil
}
case []byte:
// If it is a JSON string, automatically unmarshal it!
if len(r) > 0 && r[0] == '{' && r[len(r)-1] == '}' {
if err := json.UnmarshalUseNumber(r, &dataMap); err != nil {
return nil
}
} else {
return nil
}
case map[interface{}]interface{}:
for k, v := range r {
dataMap[String(k)] = doMapConvertForMapOrStructValue(false, v, recursive, newTags...)
}
case map[interface{}]string:
for k, v := range r {
dataMap[String(k)] = v
}
case map[interface{}]int:
for k, v := range r {
dataMap[String(k)] = v
}
case map[interface{}]uint:
for k, v := range r {
dataMap[String(k)] = v
}
case map[interface{}]float32:
for k, v := range r {
dataMap[String(k)] = v
}
case map[interface{}]float64:
for k, v := range r {
dataMap[String(k)] = v
}
case map[string]bool:
for k, v := range r {
dataMap[k] = v
}
case map[string]int:
for k, v := range r {
dataMap[k] = v
}
case map[string]uint:
for k, v := range r {
dataMap[k] = v
}
case map[string]float32:
for k, v := range r {
dataMap[k] = v
}
case map[string]float64:
for k, v := range r {
dataMap[k] = v
}
case map[string]interface{}:
if recursive {
// A copy of current map.
for k, v := range r {
dataMap[k] = doMapConvertForMapOrStructValue(false, v, recursive, newTags...)
}
} else {
// It returns the map directly without any changing.
return r
}
case map[int]interface{}:
for k, v := range r {
dataMap[String(k)] = doMapConvertForMapOrStructValue(false, v, recursive, newTags...)
}
case map[int]string:
for k, v := range r {
dataMap[String(k)] = v
}
case map[uint]string:
for k, v := range r {
dataMap[String(k)] = v
}
default:
// Not a common type, it then uses reflection for conversion.
var reflectValue reflect.Value
if v, ok := value.(reflect.Value); ok {
reflectValue = v
} else {
reflectValue = reflect.ValueOf(value)
}
reflectKind := reflectValue.Kind()
// If it is a pointer, we should find its real data type.
for reflectKind == reflect.Ptr {
reflectValue = reflectValue.Elem()
reflectKind = reflectValue.Kind()
}
switch reflectKind {
// If `value` is type of array, it converts the value of even number index as its key and
// the value of odd number index as its corresponding value, for example:
// []string{"k1","v1","k2","v2"} => map[string]interface{}{"k1":"v1", "k2":"v2"}
// []string{"k1","v1","k2"} => map[string]interface{}{"k1":"v1", "k2":nil}
case reflect.Slice, reflect.Array:
length := reflectValue.Len()
for i := 0; i < length; i += 2 {
if i+1 < length {
dataMap[String(reflectValue.Index(i).Interface())] = reflectValue.Index(i + 1).Interface()
} else {
dataMap[String(reflectValue.Index(i).Interface())] = nil
}
}
case reflect.Map, reflect.Struct, reflect.Interface:
convertedValue := doMapConvertForMapOrStructValue(true, value, recursive, newTags...)
if m, ok := convertedValue.(map[string]interface{}); ok {
return m
}
return nil
default:
return nil
}
}
return dataMap
}
func doMapConvertForMapOrStructValue(isRoot bool, value interface{}, recursive bool, tags ...string) interface{} {
if isRoot == false && recursive == false {
return value
}
var reflectValue reflect.Value
if v, ok := value.(reflect.Value); ok {
reflectValue = v
value = v.Interface()
} else {
reflectValue = reflect.ValueOf(value)
}
reflectKind := reflectValue.Kind()
// If it is a pointer, we should find its real data type.
for reflectKind == reflect.Ptr {
reflectValue = reflectValue.Elem()
reflectKind = reflectValue.Kind()
}
switch reflectKind {
case reflect.Map:
var (
mapKeys = reflectValue.MapKeys()
dataMap = make(map[string]interface{})
)
for _, k := range mapKeys {
dataMap[String(k.Interface())] = doMapConvertForMapOrStructValue(
false,
reflectValue.MapIndex(k).Interface(),
recursive,
tags...,
)
}
if len(dataMap) == 0 {
return value
}
return dataMap
case reflect.Struct:
// Map converting interface check.
if v, ok := value.(iMapStrAny); ok {
m := v.MapStrAny()
if recursive {
for k, v := range m {
m[k] = doMapConvertForMapOrStructValue(false, v, recursive, tags...)
}
}
return m
}
// Using reflect for converting.
var (
rtField reflect.StructField
rvField reflect.Value
dataMap = make(map[string]interface{}) // result map.
reflectType = reflectValue.Type() // attribute value type.
mapKey = "" // mapKey may be the tag name or the struct attribute name.
)
for i := 0; i < reflectValue.NumField(); i++ {
rtField = reflectType.Field(i)
rvField = reflectValue.Field(i)
// Only convert the public attributes.
fieldName := rtField.Name
if !utils.IsLetterUpper(fieldName[0]) {
continue
}
mapKey = ""
fieldTag := rtField.Tag
for _, tag := range tags {
if mapKey = fieldTag.Get(tag); mapKey != "" {
break
}
}
if mapKey == "" {
mapKey = fieldName
} else {
// Support json tag feature: -, omitempty
mapKey = strings.TrimSpace(mapKey)
if mapKey == "-" {
continue
}
array := strings.Split(mapKey, ",")
if len(array) > 1 {
switch strings.TrimSpace(array[1]) {
case "omitempty":
if empty.IsEmpty(rvField.Interface()) {
continue
} else {
mapKey = strings.TrimSpace(array[0])
}
default:
mapKey = strings.TrimSpace(array[0])
}
}
}
if recursive || rtField.Anonymous {
// Do map converting recursively.
var (
rvAttrField = rvField
rvAttrKind = rvField.Kind()
)
if rvAttrKind == reflect.Ptr {
rvAttrField = rvField.Elem()
rvAttrKind = rvAttrField.Kind()
}
switch rvAttrKind {
case reflect.Struct:
// Embedded struct and has no fields, just ignores it.
// Eg: gmeta.Meta
if rvAttrField.Type().NumField() == 0 {
continue
}
var (
hasNoTag = mapKey == fieldName
rvAttrInterface = rvAttrField.Interface()
)
if hasNoTag && rtField.Anonymous {
// It means this attribute field has no tag.
// Overwrite the attribute with sub-struct attribute fields.
anonymousValue := doMapConvertForMapOrStructValue(false, rvAttrInterface, true, tags...)
if m, ok := anonymousValue.(map[string]interface{}); ok {
for k, v := range m {
dataMap[k] = v
}
} else {
dataMap[mapKey] = rvAttrInterface
}
} else if !hasNoTag && rtField.Anonymous {
// It means this attribute field has desired tag.
dataMap[mapKey] = doMapConvertForMapOrStructValue(false, rvAttrInterface, true, tags...)
} else {
dataMap[mapKey] = doMapConvertForMapOrStructValue(false, rvAttrInterface, recursive, tags...)
}
// The struct attribute is type of slice.
case reflect.Array, reflect.Slice:
length := rvAttrField.Len()
if length == 0 {
dataMap[mapKey] = rvAttrField.Interface()
break
}
array := make([]interface{}, length)
for i := 0; i < length; i++ {
array[i] = doMapConvertForMapOrStructValue(false, rvAttrField.Index(i), recursive, tags...)
}
dataMap[mapKey] = array
default:
if rvField.IsValid() {
dataMap[mapKey] = reflectValue.Field(i).Interface()
} else {
dataMap[mapKey] = nil
}
}
} else {
// No recursive map value converting
if rvField.IsValid() {
dataMap[mapKey] = reflectValue.Field(i).Interface()
} else {
dataMap[mapKey] = nil
}
}
}
if len(dataMap) == 0 {
return value
}
return dataMap
// The given value is type of slice.
case reflect.Array, reflect.Slice:
length := reflectValue.Len()
if length == 0 {
break
}
array := make([]interface{}, reflectValue.Len())
for i := 0; i < length; i++ {
array[i] = doMapConvertForMapOrStructValue(false, reflectValue.Index(i), recursive, tags...)
}
return array
}
return value
}
// MapStrStr converts `value` to map[string]string.
// Note that there might be data copy for this map type converting.
func MapStrStr(value interface{}, tags ...string) map[string]string {
if r, ok := value.(map[string]string); ok {
return r
}
m := Map(value, tags...)
if len(m) > 0 {
vMap := make(map[string]string, len(m))
for k, v := range m {
vMap[k] = String(v)
}
return vMap
}
return nil
}
// MapStrStrDeep converts `value` to map[string]string recursively.
// Note that there might be data copy for this map type converting.
func MapStrStrDeep(value interface{}, tags ...string) map[string]string {
if r, ok := value.(map[string]string); ok {
return r
}
m := MapDeep(value, tags...)
if len(m) > 0 {
vMap := make(map[string]string, len(m))
for k, v := range m {
vMap[k] = String(v)
}
return vMap
}
return nil
}