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// Copyright (c) 2018, Maxime Soulé
// All rights reserved.
//
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree.
package dark
import (
"reflect"
)
// GetInterface does its best to return the data behind val. If force
// is true, it tries to bypass golang protections using the unsafe
// package.
//
// It returns (nil, false) if the data behind val can not be retrieved
// as an any interface (aka struct private + non-copyable field).
var GetInterface = func(val reflect.Value, force bool) (any, bool) {
if !val.IsValid() {
return nil, true
}
if val.CanInterface() {
return val.Interface(), true
}
if force {
val = unsafeReflectValue(val)
if val.CanInterface() {
return val.Interface(), true
}
}
// For some types, we can copy them in new visitable reflect.Value instances
copyVal, ok := CopyValue(val)
if ok && copyVal.CanInterface() {
return copyVal.Interface(), true
}
// For others, in environments where "unsafe" package is not
// available, we cannot go further
return nil, false
}
// MustGetInterface does its best to return the data behind val. If it
// fails (struct private + non-copyable field), it panics.
func MustGetInterface(val reflect.Value) any {
ret, ok := GetInterface(val, true)
if ok {
return ret
}
panic("dark.GetInterface() does not handle private " +
val.Kind().String() + " kind")
}
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