mirror of
https://gitee.com/johng/gf.git
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289 lines
8.5 KiB
Go
289 lines
8.5 KiB
Go
// Copyright 2017-2019 gf Author(https://github.com/gogf/gf). All Rights Reserved.
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//
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// This Source Code Form is subject to the terms of the MIT License.
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// If a copy of the MIT was not distributed with this file,
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// You can obtain one at https://github.com/gogf/gf.
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package gconv
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import (
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"errors"
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"fmt"
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"reflect"
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"strings"
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"github.com/gogf/gf/g/internal/structs"
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"github.com/gogf/gf/g/internal/strutils"
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)
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// Struct maps the params key-value pairs to the corresponding struct object's properties.
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// The third parameter <mapping> is unnecessary, indicating the mapping rules between the custom key name
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// and the attribute name(case sensitive).
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//
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// Note:
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// 1. The <params> can be any type of map/struct, usually a map.
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// 2. The second parameter <pointer> should be a pointer to the struct object.
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// 3. Only the public attributes of struct object can be mapped.
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// 4. If <params> is a map, the key of the map <params> can be lowercase.
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// It will automatically convert the first letter of the key to uppercase
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// in mapping procedure to do the matching.
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// It ignores the map key, if it does not match.
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func Struct(params interface{}, pointer interface{}, mapping ...map[string]string) error {
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if params == nil {
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return errors.New("params cannot be nil")
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}
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if pointer == nil {
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return errors.New("object pointer cannot be nil")
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}
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paramsMap := Map(params)
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if paramsMap == nil {
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return fmt.Errorf("invalid params: %v", params)
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}
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// Using reflect to do the converting,
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// it also supports type of reflect.Value for <pointer>(always in internal usage).
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elem, ok := pointer.(reflect.Value)
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if !ok {
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rv := reflect.ValueOf(pointer)
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if kind := rv.Kind(); kind != reflect.Ptr {
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return fmt.Errorf("object pointer should be type of: %v", kind)
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}
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// Using IsNil on reflect.Ptr variable is OK.
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if !rv.IsValid() || rv.IsNil() {
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return errors.New("object pointer cannot be nil")
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}
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elem = rv.Elem()
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// Auto create struct object.
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// For example, if <pointer> is **User, then <elem> is *User, which is a pointer to User.
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if elem.Type().Kind() == reflect.Ptr && (!elem.IsValid() || elem.IsNil()) {
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e := reflect.New(elem.Type().Elem()).Elem()
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elem.Set(e.Addr())
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elem = e
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}
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}
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// It only performs one converting to the same attribute.
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// doneMap is used to check repeated converting.
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doneMap := make(map[string]bool)
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// It first checks the passed mapping rules.
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if len(mapping) > 0 && len(mapping[0]) > 0 {
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for mapK, mapV := range mapping[0] {
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if v, ok := paramsMap[mapK]; ok {
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doneMap[mapV] = true
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if err := bindVarToStructAttr(elem, mapV, v); err != nil {
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return err
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}
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}
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}
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}
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// It secondly checks the tags of attributes.
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tagMap := structs.TagMapName(pointer, structTagPriority, true)
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for tagK, tagV := range tagMap {
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if _, ok := doneMap[tagV]; ok {
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continue
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}
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if v, ok := paramsMap[tagK]; ok {
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doneMap[tagV] = true
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if err := bindVarToStructAttr(elem, tagV, v); err != nil {
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return err
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}
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}
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}
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// It finally do the converting with default rules.
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attrMap := make(map[string]struct{})
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elemType := elem.Type()
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for i := 0; i < elem.NumField(); i++ {
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// Only do converting to public attributes.
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if !strutils.IsLetterUpper(elemType.Field(i).Name[0]) {
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continue
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}
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attrMap[elemType.Field(i).Name] = struct{}{}
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}
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for mapK, mapV := range paramsMap {
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name := ""
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for _, checkName := range []string{
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strutils.UcFirst(mapK),
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strutils.ReplaceByMap(mapK, map[string]string{
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"_": "",
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"-": "",
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" ": "",
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})} {
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if _, ok := doneMap[checkName]; ok {
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continue
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}
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if _, ok := tagMap[checkName]; ok {
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continue
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}
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// Loop to find the matched attribute name.
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for value, _ := range attrMap {
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if strings.EqualFold(checkName, value) {
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name = value
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break
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}
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if strings.EqualFold(checkName, strings.Replace(value, "_", "", -1)) {
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name = value
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break
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}
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}
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doneMap[checkName] = true
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if name != "" {
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break
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}
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}
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// No matching, give up this attribute converting.
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if name == "" {
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continue
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}
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if err := bindVarToStructAttr(elem, name, mapV); err != nil {
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return err
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}
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}
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return nil
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}
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// StructDeep do Struct function recursively.
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// See Struct.
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func StructDeep(params interface{}, pointer interface{}, mapping ...map[string]string) error {
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if err := Struct(params, pointer, mapping...); err != nil {
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return err
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} else {
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rv, ok := pointer.(reflect.Value)
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if !ok {
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rv = reflect.ValueOf(pointer)
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}
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kind := rv.Kind()
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if kind == reflect.Ptr {
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rv = rv.Elem()
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kind = rv.Kind()
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}
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switch kind {
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case reflect.Struct:
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rt := rv.Type()
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for i := 0; i < rv.NumField(); i++ {
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// Only do converting to public attributes.
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if !strutils.IsLetterUpper(rt.Field(i).Name[0]) {
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continue
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}
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trv := rv.Field(i)
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switch trv.Kind() {
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case reflect.Struct:
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if err := StructDeep(params, trv, mapping...); err != nil {
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return err
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}
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}
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}
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}
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}
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return nil
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}
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// 将参数值绑定到对象指定名称的属性上
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func bindVarToStructAttr(elem reflect.Value, name string, value interface{}) (err error) {
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structFieldValue := elem.FieldByName(name)
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// 键名与对象属性匹配检测，map中如果有struct不存在的属性，那么不做处理，直接return
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if !structFieldValue.IsValid() {
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return nil
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}
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// CanSet的属性必须为公开属性(首字母大写)
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if !structFieldValue.CanSet() {
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return nil
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}
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// 必须将value转换为struct属性的数据类型，这里必须用到gconv包
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defer func() {
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// 如果转换失败，那么可能是类型不匹配造成(例如属性包含自定义类型)，那么执行递归转换
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if recover() != nil {
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err = bindVarToReflectValue(structFieldValue, value)
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}
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}()
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structFieldValue.Set(reflect.ValueOf(Convert(value, structFieldValue.Type().String())))
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return nil
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}
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// 将参数值绑定到对象指定索引位置的属性上
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func bindVarToStructByIndex(elem reflect.Value, index int, value interface{}) (err error) {
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structFieldValue := elem.FieldByIndex([]int{index})
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// 键名与对象属性匹配检测
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if !structFieldValue.IsValid() {
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return nil
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}
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// CanSet的属性必须为公开属性(首字母大写)
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if !structFieldValue.CanSet() {
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return nil
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}
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// 必须将value转换为struct属性的数据类型，这里必须用到gconv包
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defer func() {
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// 如果转换失败，那么可能是类型不匹配造成(例如属性包含自定义类型)，那么执行递归转换
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if recover() != nil {
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err = bindVarToReflectValue(structFieldValue, value)
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}
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}()
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structFieldValue.Set(reflect.ValueOf(Convert(value, structFieldValue.Type().String())))
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return nil
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}
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// 当默认的基本类型转换失败时，通过recover判断后执行反射类型转换(处理复杂类型)
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func bindVarToReflectValue(structFieldValue reflect.Value, value interface{}) error {
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switch structFieldValue.Kind() {
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// 属性为结构体
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case reflect.Struct:
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if err := Struct(value, structFieldValue); err != nil {
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structFieldValue.Set(reflect.ValueOf(value))
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}
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// 属性为数组类型
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case reflect.Slice:
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fallthrough
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case reflect.Array:
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a := reflect.Value{}
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v := reflect.ValueOf(value)
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if v.Kind() == reflect.Slice || v.Kind() == reflect.Array {
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if v.Len() > 0 {
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a = reflect.MakeSlice(structFieldValue.Type(), v.Len(), v.Len())
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t := a.Index(0).Type()
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for i := 0; i < v.Len(); i++ {
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if t.Kind() == reflect.Ptr {
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e := reflect.New(t.Elem()).Elem()
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if err := Struct(v.Index(i).Interface(), e); err != nil {
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e.Set(reflect.ValueOf(v.Index(i).Interface()))
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}
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a.Index(i).Set(e.Addr())
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} else {
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e := reflect.New(t).Elem()
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if err := Struct(v.Index(i).Interface(), e); err != nil {
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e.Set(reflect.ValueOf(v.Index(i).Interface()))
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}
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a.Index(i).Set(e)
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}
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}
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}
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} else {
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a = reflect.MakeSlice(structFieldValue.Type(), 1, 1)
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t := a.Index(0).Type()
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if t.Kind() == reflect.Ptr {
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e := reflect.New(t.Elem()).Elem()
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if err := Struct(value, e); err != nil {
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e.Set(reflect.ValueOf(value))
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}
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a.Index(0).Set(e.Addr())
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} else {
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e := reflect.New(t).Elem()
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if err := Struct(value, e); err != nil {
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e.Set(reflect.ValueOf(value))
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}
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a.Index(0).Set(e)
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}
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}
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structFieldValue.Set(a)
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// 属性为指针类型
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case reflect.Ptr:
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e := reflect.New(structFieldValue.Type().Elem()).Elem()
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if err := Struct(value, e); err != nil {
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e.Set(reflect.ValueOf(value))
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}
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structFieldValue.Set(e.Addr())
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default:
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return errors.New(fmt.Sprintf(`cannot convert to type "%s"`, structFieldValue.Type().String()))
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}
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return nil
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}
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