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// Copyright 2015 go-swagger maintainers
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package typeutils
import "reflect"
type zeroable interface {
IsZero() bool
}
// IsZero returns true when the value passed into the function is a zero value.
// This allows for safer checking of interface values.
func IsZero(data any) bool {
v := reflect.ValueOf(data)
// check for nil data
switch v.Kind() { //nolint:exhaustive
case
reflect.Interface,
reflect.Func,
reflect.Chan,
reflect.Pointer,
reflect.UnsafePointer,
reflect.Map,
reflect.Slice:
if v.IsNil() {
return true
}
}
// check for things that have an IsZero method instead
if vv, ok := data.(zeroable); ok {
return vv.IsZero()
}
// continue with slightly more complex reflection
switch v.Kind() { //nolint:exhaustive
case 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.Struct, reflect.Array:
return reflect.DeepEqual(data, reflect.Zero(v.Type()).Interface())
case reflect.Invalid:
return true
default:
return false
}
}
// IsNil checks if input is nil.
//
// For types chan, func, interface, map, pointer, or slice it returns true if its argument is nil.
//
// See [reflect.Value.IsNil].
func IsNil(input any) bool {
if input == nil {
return true
}
kind := reflect.TypeOf(input).Kind()
switch kind { //nolint:exhaustive
case reflect.Pointer,
reflect.UnsafePointer,
reflect.Map,
reflect.Slice,
reflect.Chan,
reflect.Interface,
reflect.Func:
return reflect.ValueOf(input).IsNil()
default:
return false
}
}
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