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Copy pathgconv_slice.go
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154 lines (143 loc) · 4.25 KB
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// Copyright 2017 gf Author(https://github.com/gogf/gf). 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 (
"errors"
"fmt"
"reflect"
)
// SliceMap is alias of Maps.
func SliceMap(i interface{}) []map[string]interface{} {
return Maps(i)
}
// SliceMapDeep is alias of MapsDeep.
func SliceMapDeep(i interface{}) []map[string]interface{} {
return MapsDeep(i)
}
// SliceStruct is alias of Structs.
func SliceStruct(params interface{}, pointer interface{}, mapping ...map[string]string) (err error) {
return Structs(params, pointer, mapping...)
}
// SliceStructDeep is alias of StructsDeep.
func SliceStructDeep(params interface{}, pointer interface{}, mapping ...map[string]string) (err error) {
return StructsDeep(params, pointer, mapping...)
}
// Maps converts <i> to []map[string]interface{}.
func Maps(value interface{}, tags ...string) []map[string]interface{} {
if value == nil {
return nil
}
if r, ok := value.([]map[string]interface{}); ok {
return r
} else {
array := Interfaces(value)
if len(array) == 0 {
return nil
}
list := make([]map[string]interface{}, len(array))
for k, v := range array {
list[k] = Map(v, tags...)
}
return list
}
}
// MapsDeep converts <i> to []map[string]interface{} recursively.
func MapsDeep(value interface{}, tags ...string) []map[string]interface{} {
if value == nil {
return nil
}
if r, ok := value.([]map[string]interface{}); ok {
return r
} else {
array := Interfaces(value)
if len(array) == 0 {
return nil
}
list := make([]map[string]interface{}, len(array))
for k, v := range array {
list[k] = MapDeep(v, tags...)
}
return list
}
}
// Structs converts any slice to given struct slice.
func Structs(params interface{}, pointer interface{}, mapping ...map[string]string) (err error) {
return doStructs(params, pointer, false, mapping...)
}
// StructsDeep converts any slice to given struct slice recursively.
func StructsDeep(params interface{}, pointer interface{}, mapping ...map[string]string) (err error) {
return doStructs(params, pointer, true, mapping...)
}
// doStructs converts any slice to given struct slice.
//
// The parameter <params> should be type of slice.
//
// The parameter <pointer> should be type of pointer to slice of struct.
// Note that if <pointer> is a pointer to another pointer of type of slice of struct,
// it will create the struct/pointer internally.
func doStructs(params interface{}, pointer interface{}, deep bool, mapping ...map[string]string) (err error) {
if params == nil {
return errors.New("params cannot be nil")
}
if pointer == nil {
return errors.New("object pointer cannot be nil")
}
pointerRv, ok := pointer.(reflect.Value)
if !ok {
pointerRv = reflect.ValueOf(pointer)
if kind := pointerRv.Kind(); kind != reflect.Ptr {
return fmt.Errorf("pointer should be type of pointer, but got: %v", kind)
}
}
rv := reflect.ValueOf(params)
kind := rv.Kind()
for kind == reflect.Ptr {
rv = rv.Elem()
kind = rv.Kind()
}
switch kind {
case reflect.Slice, reflect.Array:
// If <params> is an empty slice, no conversion.
if rv.Len() == 0 {
return nil
}
array := reflect.MakeSlice(pointerRv.Type().Elem(), rv.Len(), rv.Len())
itemType := array.Index(0).Type()
for i := 0; i < rv.Len(); i++ {
if itemType.Kind() == reflect.Ptr {
// Slice element is type pointer.
e := reflect.New(itemType.Elem()).Elem()
if deep {
if err = StructDeep(rv.Index(i).Interface(), e, mapping...); err != nil {
return err
}
} else {
if err = Struct(rv.Index(i).Interface(), e, mapping...); err != nil {
return err
}
}
array.Index(i).Set(e.Addr())
} else {
// Slice element is not type of pointer.
e := reflect.New(itemType).Elem()
if deep {
if err = StructDeep(rv.Index(i).Interface(), e, mapping...); err != nil {
return err
}
} else {
if err = Struct(rv.Index(i).Interface(), e, mapping...); err != nil {
return err
}
}
array.Index(i).Set(e)
}
}
pointerRv.Elem().Set(array)
return nil
default:
return fmt.Errorf("params should be type of slice, but got: %v", kind)
}
}