mirror of
https://github.com/gogf/gf.git
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647 lines
18 KiB
Go
647 lines
18 KiB
Go
// Copyright GoFrame Author(https://goframe.org). 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 converter
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import (
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"reflect"
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"strings"
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"github.com/gogf/gf/v2/internal/empty"
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"github.com/gogf/gf/v2/internal/json"
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"github.com/gogf/gf/v2/internal/utils"
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"github.com/gogf/gf/v2/util/gconv/internal/localinterface"
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"github.com/gogf/gf/v2/util/gtag"
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)
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// MapOption specifies the option for map converting.
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type MapOption struct {
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// Deep marks doing Map function recursively, which means if the attribute of given converting value
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// is also a struct/*struct, it automatically calls Map function on this attribute converting it to
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// a map[string]any type variable.
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Deep bool
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// OmitEmpty ignores the attributes that has json `omitempty` tag.
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OmitEmpty bool
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// Tags specifies the converted map key name by struct tag name.
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Tags []string
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// ContinueOnError specifies whether to continue converting the next element
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// if one element converting fails.
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ContinueOnError bool
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}
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// Map converts any variable `value` to map[string]any. If the parameter `value` is not a
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// map/struct/*struct type, then the conversion will fail and returns nil.
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//
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// If `value` is a struct/*struct object, the second parameter `priorityTagAndFieldName` specifies the most priority
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// priorityTagAndFieldName that will be detected, otherwise it detects the priorityTagAndFieldName in order of:
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// gconv, json, field name.
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func (c *Converter) Map(value any, option MapOption) (map[string]any, error) {
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return c.doMapConvert(value, RecursiveTypeAuto, false, option)
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}
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// MapStrStr converts `value` to map[string]string.
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// Note that there might be data copy for this map type converting.
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func (c *Converter) MapStrStr(value any, option MapOption) (map[string]string, error) {
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if r, ok := value.(map[string]string); ok {
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return r, nil
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}
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m, err := c.Map(value, option)
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if err != nil && !option.ContinueOnError {
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return nil, err
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}
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if len(m) > 0 {
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var (
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s string
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vMap = make(map[string]string, len(m))
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)
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for k, v := range m {
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s, err = c.String(v)
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if err != nil && !option.ContinueOnError {
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return nil, err
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}
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vMap[k] = s
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}
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return vMap, nil
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}
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return nil, nil
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}
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// MapConvert implements the map converting.
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// It automatically checks and converts json string to map if `value` is string/[]byte.
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//
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// TODO completely implement the recursive converting for all types, especially the map.
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func (c *Converter) doMapConvert(
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value any, recursive RecursiveType, mustMapReturn bool, option MapOption,
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) (map[string]any, error) {
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if value == nil {
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return nil, nil
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}
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// It redirects to its underlying value if it has implemented interface iVal.
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if v, ok := value.(localinterface.IVal); ok {
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value = v.Val()
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}
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var (
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err error
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newTags = gtag.StructTagPriority
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)
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if option.Deep {
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recursive = RecursiveTypeTrue
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}
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switch len(option.Tags) {
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case 0:
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// No need handling.
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case 1:
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newTags = append(strings.Split(option.Tags[0], ","), gtag.StructTagPriority...)
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default:
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newTags = append(option.Tags, gtag.StructTagPriority...)
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}
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// Assert the common combination of types, and finally it uses reflection.
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dataMap := make(map[string]interface{})
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switch r := value.(type) {
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case string:
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// If it is a JSON string, automatically unmarshal it!
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if len(r) > 0 && r[0] == '{' && r[len(r)-1] == '}' {
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if err = json.UnmarshalUseNumber([]byte(r), &dataMap); err != nil {
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return nil, err
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}
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} else {
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return nil, nil
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}
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case []byte:
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// If it is a JSON string, automatically unmarshal it!
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if len(r) > 0 && r[0] == '{' && r[len(r)-1] == '}' {
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if err = json.UnmarshalUseNumber(r, &dataMap); err != nil {
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return nil, err
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}
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} else {
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return nil, nil
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}
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case map[interface{}]interface{}:
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recursiveOption := option
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recursiveOption.Tags = newTags
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for k, v := range r {
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s, err := c.String(k)
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if err != nil && !option.ContinueOnError {
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return nil, err
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}
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dataMap[s], err = c.doMapConvertForMapOrStructValue(
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doMapConvertForMapOrStructValueInput{
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IsRoot: false,
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Value: v,
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RecursiveType: recursive,
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RecursiveOption: recursive == RecursiveTypeTrue,
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Option: recursiveOption,
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},
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)
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if err != nil && !option.ContinueOnError {
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return nil, err
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}
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}
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case map[interface{}]string:
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for k, v := range r {
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s, err := c.String(k)
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if err != nil && !option.ContinueOnError {
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return nil, err
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}
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dataMap[s] = v
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}
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case map[interface{}]int:
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for k, v := range r {
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s, err := c.String(k)
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if err != nil && !option.ContinueOnError {
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return nil, err
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}
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dataMap[s] = v
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}
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case map[interface{}]uint:
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for k, v := range r {
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s, err := c.String(k)
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if err != nil && !option.ContinueOnError {
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return nil, err
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}
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dataMap[s] = v
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}
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case map[interface{}]float32:
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for k, v := range r {
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s, err := c.String(k)
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if err != nil && !option.ContinueOnError {
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return nil, err
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}
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dataMap[s] = v
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}
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case map[interface{}]float64:
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for k, v := range r {
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s, err := c.String(k)
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if err != nil && !option.ContinueOnError {
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return nil, err
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}
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dataMap[s] = v
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}
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case map[string]bool:
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for k, v := range r {
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dataMap[k] = v
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}
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case map[string]int:
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for k, v := range r {
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dataMap[k] = v
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}
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case map[string]uint:
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for k, v := range r {
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dataMap[k] = v
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}
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case map[string]float32:
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for k, v := range r {
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dataMap[k] = v
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}
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case map[string]float64:
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for k, v := range r {
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dataMap[k] = v
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}
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case map[string]string:
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for k, v := range r {
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dataMap[k] = v
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}
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case map[string]interface{}:
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if recursive == RecursiveTypeTrue {
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recursiveOption := option
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recursiveOption.Tags = newTags
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// A copy of current map.
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for k, v := range r {
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dataMap[k], err = c.doMapConvertForMapOrStructValue(
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doMapConvertForMapOrStructValueInput{
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IsRoot: false,
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Value: v,
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RecursiveType: recursive,
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RecursiveOption: recursive == RecursiveTypeTrue,
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Option: recursiveOption,
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},
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)
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if err != nil && !option.ContinueOnError {
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return nil, err
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}
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}
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} else {
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// It returns the map directly without any changing.
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return r, nil
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}
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case map[int]interface{}:
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recursiveOption := option
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recursiveOption.Tags = newTags
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for k, v := range r {
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s, err := c.String(k)
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if err != nil && !option.ContinueOnError {
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return nil, err
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}
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dataMap[s], err = c.doMapConvertForMapOrStructValue(
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doMapConvertForMapOrStructValueInput{
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IsRoot: false,
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Value: v,
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RecursiveType: recursive,
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RecursiveOption: recursive == RecursiveTypeTrue,
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Option: recursiveOption,
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},
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)
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if err != nil && !option.ContinueOnError {
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return nil, err
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}
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}
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case map[int]string:
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for k, v := range r {
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s, err := c.String(k)
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if err != nil && !option.ContinueOnError {
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return nil, err
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}
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dataMap[s] = v
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}
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case map[uint]string:
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for k, v := range r {
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s, err := c.String(k)
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if err != nil && !option.ContinueOnError {
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return nil, err
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}
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dataMap[s] = v
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}
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default:
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// Not a common type, it then uses reflection for conversion.
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var reflectValue reflect.Value
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if v, ok := value.(reflect.Value); ok {
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reflectValue = v
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} else {
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reflectValue = reflect.ValueOf(value)
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}
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reflectKind := reflectValue.Kind()
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// If it is a pointer, we should find its real data type.
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for reflectKind == reflect.Ptr {
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reflectValue = reflectValue.Elem()
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reflectKind = reflectValue.Kind()
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}
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switch reflectKind {
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// If `value` is type of array, it converts the value of even number index as its key and
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// the value of odd number index as its corresponding value, for example:
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// []string{"k1","v1","k2","v2"} => map[string]interface{}{"k1":"v1", "k2":"v2"}
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// []string{"k1","v1","k2"} => map[string]interface{}{"k1":"v1", "k2":nil}
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case reflect.Slice, reflect.Array:
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length := reflectValue.Len()
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for i := 0; i < length; i += 2 {
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s, err := c.String(reflectValue.Index(i).Interface())
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if err != nil && !option.ContinueOnError {
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return nil, err
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}
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if i+1 < length {
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dataMap[s] = reflectValue.Index(i + 1).Interface()
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} else {
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dataMap[s] = nil
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}
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}
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case reflect.Map, reflect.Struct, reflect.Interface:
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recursiveOption := option
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recursiveOption.Tags = newTags
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convertedValue, err := c.doMapConvertForMapOrStructValue(
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doMapConvertForMapOrStructValueInput{
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IsRoot: true,
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Value: value,
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RecursiveType: recursive,
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RecursiveOption: recursive == RecursiveTypeTrue,
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Option: recursiveOption,
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MustMapReturn: mustMapReturn,
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},
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)
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if err != nil && !option.ContinueOnError {
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return nil, err
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}
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if m, ok := convertedValue.(map[string]interface{}); ok {
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return m, nil
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}
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return nil, nil
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default:
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return nil, nil
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}
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}
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return dataMap, nil
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}
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type doMapConvertForMapOrStructValueInput struct {
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IsRoot bool // It returns directly if it is not root and with no recursive converting.
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Value interface{} // Current operation value.
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RecursiveType RecursiveType // The type from top function entry.
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RecursiveOption bool // Whether convert recursively for `current` operation.
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Option MapOption // Map converting option.
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MustMapReturn bool // Must return map instead of Value when empty.
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}
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func (c *Converter) doMapConvertForMapOrStructValue(in doMapConvertForMapOrStructValueInput) (any, error) {
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if !in.IsRoot && !in.RecursiveOption {
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return in.Value, nil
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}
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var (
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err error
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reflectValue reflect.Value
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)
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if v, ok := in.Value.(reflect.Value); ok {
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reflectValue = v
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in.Value = v.Interface()
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} else {
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reflectValue = reflect.ValueOf(in.Value)
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}
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reflectKind := reflectValue.Kind()
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// If it is a pointer, we should find its real data type.
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for reflectKind == reflect.Ptr {
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reflectValue = reflectValue.Elem()
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reflectKind = reflectValue.Kind()
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}
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switch reflectKind {
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case reflect.Map:
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var (
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mapIter = reflectValue.MapRange()
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dataMap = make(map[string]interface{})
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)
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for mapIter.Next() {
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var (
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mapKeyValue = mapIter.Value()
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mapValue interface{}
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)
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switch {
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case mapKeyValue.IsZero():
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if utils.CanCallIsNil(mapKeyValue) && mapKeyValue.IsNil() {
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// quick check for nil value.
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mapValue = nil
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} else {
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// in case of:
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// exception recovered: reflect: call of reflect.Value.Interface on zero Value
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mapValue = reflect.New(mapKeyValue.Type()).Elem().Interface()
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}
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default:
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mapValue = mapKeyValue.Interface()
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}
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s, err := c.String(mapIter.Key().Interface())
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if err != nil && !in.Option.ContinueOnError {
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return nil, err
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}
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dataMap[s], err = c.doMapConvertForMapOrStructValue(
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doMapConvertForMapOrStructValueInput{
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IsRoot: false,
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Value: mapValue,
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RecursiveType: in.RecursiveType,
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RecursiveOption: in.RecursiveType == RecursiveTypeTrue,
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Option: in.Option,
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},
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)
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if err != nil && !in.Option.ContinueOnError {
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return nil, err
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}
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}
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return dataMap, nil
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case reflect.Struct:
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var dataMap = make(map[string]interface{})
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// Map converting interface check.
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if v, ok := in.Value.(localinterface.IMapStrAny); ok {
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// Value copy, in case of concurrent safety.
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for mapK, mapV := range v.MapStrAny() {
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if in.RecursiveOption {
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dataMap[mapK], err = c.doMapConvertForMapOrStructValue(
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doMapConvertForMapOrStructValueInput{
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IsRoot: false,
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Value: mapV,
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RecursiveType: in.RecursiveType,
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RecursiveOption: in.RecursiveType == RecursiveTypeTrue,
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Option: in.Option,
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},
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)
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if err != nil && !in.Option.ContinueOnError {
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return nil, err
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}
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} else {
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dataMap[mapK] = mapV
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}
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}
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if len(dataMap) > 0 {
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return dataMap, nil
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}
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}
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// Using reflect for converting.
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var (
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rtField reflect.StructField
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rvField reflect.Value
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reflectType = reflectValue.Type() // attribute value type.
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mapKey = "" // mapKey may be the tag name or the struct attribute name.
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)
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for i := 0; i < reflectValue.NumField(); i++ {
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rtField = reflectType.Field(i)
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rvField = reflectValue.Field(i)
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// Only convert the public attributes.
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fieldName := rtField.Name
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if !utils.IsLetterUpper(fieldName[0]) {
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continue
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}
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mapKey = ""
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fieldTag := rtField.Tag
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for _, tag := range in.Option.Tags {
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if mapKey = fieldTag.Get(tag); mapKey != "" {
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break
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}
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}
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if mapKey == "" {
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mapKey = fieldName
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} else {
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// Support json tag feature: -, omitempty
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mapKey = strings.TrimSpace(mapKey)
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if mapKey == "-" {
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continue
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}
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array := strings.Split(mapKey, ",")
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if len(array) > 1 {
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switch strings.TrimSpace(array[1]) {
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case "omitempty":
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if in.Option.OmitEmpty && empty.IsEmpty(rvField.Interface()) {
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continue
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} else {
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mapKey = strings.TrimSpace(array[0])
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}
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default:
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mapKey = strings.TrimSpace(array[0])
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}
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}
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if mapKey == "" {
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mapKey = fieldName
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}
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}
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if in.RecursiveOption || rtField.Anonymous {
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// Do map converting recursively.
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var (
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rvAttrField = rvField
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rvAttrKind = rvField.Kind()
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)
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if rvAttrKind == reflect.Ptr {
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rvAttrField = rvField.Elem()
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rvAttrKind = rvAttrField.Kind()
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}
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switch rvAttrKind {
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case reflect.Struct:
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// Embedded struct and has no fields, just ignores it.
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// Eg: gmeta.Meta
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if rvAttrField.Type().NumField() == 0 {
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continue
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}
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var (
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hasNoTag = mapKey == fieldName
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// DO NOT use rvAttrField.Interface() here,
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// as it might be changed from pointer to struct.
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rvInterface = rvField.Interface()
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)
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switch {
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case hasNoTag && rtField.Anonymous:
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// It means this attribute field has no tag.
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// Overwrite the attribute with sub-struct attribute fields.
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anonymousValue, err := c.doMapConvertForMapOrStructValue(
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doMapConvertForMapOrStructValueInput{
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IsRoot: false,
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Value: rvInterface,
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RecursiveType: in.RecursiveType,
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RecursiveOption: true,
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Option: in.Option,
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},
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)
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if err != nil && !in.Option.ContinueOnError {
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return nil, err
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}
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if m, ok := anonymousValue.(map[string]interface{}); ok {
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for k, v := range m {
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dataMap[k] = v
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}
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} else {
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dataMap[mapKey] = rvInterface
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}
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// It means this attribute field has desired tag.
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case !hasNoTag && rtField.Anonymous:
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dataMap[mapKey], err = c.doMapConvertForMapOrStructValue(
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doMapConvertForMapOrStructValueInput{
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IsRoot: false,
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Value: rvInterface,
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RecursiveType: in.RecursiveType,
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RecursiveOption: true,
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Option: in.Option,
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},
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)
|
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if err != nil && !in.Option.ContinueOnError {
|
|
return nil, err
|
|
}
|
|
|
|
default:
|
|
dataMap[mapKey], err = c.doMapConvertForMapOrStructValue(
|
|
doMapConvertForMapOrStructValueInput{
|
|
IsRoot: false,
|
|
Value: rvInterface,
|
|
RecursiveType: in.RecursiveType,
|
|
RecursiveOption: in.RecursiveType == RecursiveTypeTrue,
|
|
Option: in.Option,
|
|
},
|
|
)
|
|
if err != nil && !in.Option.ContinueOnError {
|
|
return nil, err
|
|
}
|
|
}
|
|
|
|
// 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 arrayIndex := 0; arrayIndex < length; arrayIndex++ {
|
|
array[arrayIndex], err = c.doMapConvertForMapOrStructValue(
|
|
doMapConvertForMapOrStructValueInput{
|
|
IsRoot: false,
|
|
Value: rvAttrField.Index(arrayIndex).Interface(),
|
|
RecursiveType: in.RecursiveType,
|
|
RecursiveOption: in.RecursiveType == RecursiveTypeTrue,
|
|
Option: in.Option,
|
|
},
|
|
)
|
|
if err != nil && !in.Option.ContinueOnError {
|
|
return nil, err
|
|
}
|
|
}
|
|
dataMap[mapKey] = array
|
|
case reflect.Map:
|
|
var (
|
|
mapIter = rvAttrField.MapRange()
|
|
nestedMap = make(map[string]interface{})
|
|
)
|
|
for mapIter.Next() {
|
|
s, err := c.String(mapIter.Key().Interface())
|
|
if err != nil && !in.Option.ContinueOnError {
|
|
return nil, err
|
|
}
|
|
nestedMap[s], err = c.doMapConvertForMapOrStructValue(
|
|
doMapConvertForMapOrStructValueInput{
|
|
IsRoot: false,
|
|
Value: mapIter.Value().Interface(),
|
|
RecursiveType: in.RecursiveType,
|
|
RecursiveOption: in.RecursiveType == RecursiveTypeTrue,
|
|
Option: in.Option,
|
|
},
|
|
)
|
|
if err != nil && !in.Option.ContinueOnError {
|
|
return nil, err
|
|
}
|
|
}
|
|
dataMap[mapKey] = nestedMap
|
|
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 !in.MustMapReturn && len(dataMap) == 0 {
|
|
return in.Value, nil
|
|
}
|
|
return dataMap, nil
|
|
|
|
// 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], err = c.doMapConvertForMapOrStructValue(doMapConvertForMapOrStructValueInput{
|
|
IsRoot: false,
|
|
Value: reflectValue.Index(i).Interface(),
|
|
RecursiveType: in.RecursiveType,
|
|
RecursiveOption: in.RecursiveType == RecursiveTypeTrue,
|
|
Option: in.Option,
|
|
})
|
|
if err != nil && !in.Option.ContinueOnError {
|
|
return nil, err
|
|
}
|
|
}
|
|
return array, nil
|
|
|
|
default:
|
|
}
|
|
return in.Value, nil
|
|
}
|