mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-12-21 01:32:12 +00:00
82 lines
2.4 KiB
Go
82 lines
2.4 KiB
Go
// Copyright 2013 Dario Castañé. All rights reserved.
|
|
// Copyright 2009 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
// Based on src/pkg/reflect/deepequal.go from official
|
|
// golang's stdlib.
|
|
|
|
package mergo
|
|
|
|
import (
|
|
"errors"
|
|
"reflect"
|
|
)
|
|
|
|
// Errors reported by Mergo when it finds invalid arguments.
|
|
var (
|
|
ErrNilArguments = errors.New("src and dst must not be nil")
|
|
ErrDifferentArgumentsTypes = errors.New("src and dst must be of same type")
|
|
ErrNotSupported = errors.New("only structs, maps, and slices are supported")
|
|
ErrExpectedMapAsDestination = errors.New("dst was expected to be a map")
|
|
ErrExpectedStructAsDestination = errors.New("dst was expected to be a struct")
|
|
ErrNonPointerArgument = errors.New("dst must be a pointer")
|
|
)
|
|
|
|
// During deepMerge, must keep track of checks that are
|
|
// in progress. The comparison algorithm assumes that all
|
|
// checks in progress are true when it reencounters them.
|
|
// Visited are stored in a map indexed by 17 * a1 + a2;
|
|
type visit struct {
|
|
typ reflect.Type
|
|
next *visit
|
|
ptr uintptr
|
|
}
|
|
|
|
// From src/pkg/encoding/json/encode.go.
|
|
func isEmptyValue(v reflect.Value, shouldDereference bool) bool {
|
|
switch v.Kind() {
|
|
case reflect.Array, reflect.Map, reflect.Slice, reflect.String:
|
|
return v.Len() == 0
|
|
case reflect.Bool:
|
|
return !v.Bool()
|
|
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
|
|
return v.Int() == 0
|
|
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
|
|
return v.Uint() == 0
|
|
case reflect.Float32, reflect.Float64:
|
|
return v.Float() == 0
|
|
case reflect.Interface, reflect.Ptr:
|
|
if v.IsNil() {
|
|
return true
|
|
}
|
|
if shouldDereference {
|
|
return isEmptyValue(v.Elem(), shouldDereference)
|
|
}
|
|
return false
|
|
case reflect.Func:
|
|
return v.IsNil()
|
|
case reflect.Invalid:
|
|
return true
|
|
}
|
|
return false
|
|
}
|
|
|
|
func resolveValues(dst, src interface{}) (vDst, vSrc reflect.Value, err error) {
|
|
if dst == nil || src == nil {
|
|
err = ErrNilArguments
|
|
return
|
|
}
|
|
vDst = reflect.ValueOf(dst).Elem()
|
|
if vDst.Kind() != reflect.Struct && vDst.Kind() != reflect.Map && vDst.Kind() != reflect.Slice {
|
|
err = ErrNotSupported
|
|
return
|
|
}
|
|
vSrc = reflect.ValueOf(src)
|
|
// We check if vSrc is a pointer to dereference it.
|
|
if vSrc.Kind() == reflect.Ptr {
|
|
vSrc = vSrc.Elem()
|
|
}
|
|
return
|
|
}
|