64 lines
1.8 KiB
Go
64 lines
1.8 KiB
Go
// Copyright 2020 xgfone, 2023 idk
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//go:build !go1.13
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// +build !go1.13
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package bencode
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import (
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"math"
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"reflect"
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)
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func isZero(v reflect.Value) bool {
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switch v.Kind() {
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case reflect.Bool:
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return !v.Bool()
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case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
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return v.Int() == 0
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case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32,
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reflect.Uint64, reflect.Uintptr:
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return v.Uint() == 0
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case reflect.Float32, reflect.Float64:
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return math.Float64bits(v.Float()) == 0
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case reflect.Complex64, reflect.Complex128:
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c := v.Complex()
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return math.Float64bits(real(c)) == 0 && math.Float64bits(imag(c)) == 0
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case reflect.Array:
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for i := 0; i < v.Len(); i++ {
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if !isZero(v.Index(i)) {
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return false
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}
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}
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return true
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case reflect.Chan, reflect.Func, reflect.Interface, reflect.Map,
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reflect.Ptr, reflect.Slice, reflect.UnsafePointer:
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return v.IsNil()
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case reflect.String:
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return v.Len() == 0
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case reflect.Struct:
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for i := 0; i < v.NumField(); i++ {
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if !isZero(v.Field(i)) {
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return false
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}
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}
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return true
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default:
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// This should never happens, but will act as a safeguard for
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// later, as a default value doesn't makes sense here.
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panic(&reflect.ValueError{Method: "reflect.Value.IsZero", Kind: v.Kind()})
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}
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}
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