mirror of https://github.com/gohugoio/hugo.git
67 lines
1.8 KiB
Go
67 lines
1.8 KiB
Go
// Copyright 2018 The Hugo Authors. All rights reserved.
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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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// 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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package collections
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import (
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"fmt"
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"reflect"
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)
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// SymDiff returns the symmetric difference of s1 and s2.
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// Arguments must be either a slice or an array of comparable types.
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func (ns *Namespace) SymDiff(s2, s1 any) (any, error) {
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ids1, err := collectIdentities(s1)
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if err != nil {
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return nil, err
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}
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ids2, err := collectIdentities(s2)
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if err != nil {
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return nil, err
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}
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var slice reflect.Value
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var sliceElemType reflect.Type
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for i, s := range []any{s1, s2} {
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v := reflect.ValueOf(s)
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switch v.Kind() {
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case reflect.Array, reflect.Slice:
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if i == 0 {
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sliceType := v.Type()
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sliceElemType = sliceType.Elem()
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slice = reflect.MakeSlice(sliceType, 0, 0)
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}
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for i := 0; i < v.Len(); i++ {
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ev, _ := indirectInterface(v.Index(i))
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key := normalize(ev)
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// Append if the key is not in their intersection.
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if ids1[key] != ids2[key] {
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v, err := convertValue(ev, sliceElemType)
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if err != nil {
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return nil, fmt.Errorf("symdiff: failed to convert value: %w", err)
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}
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slice = reflect.Append(slice, v)
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}
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}
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default:
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return nil, fmt.Errorf("arguments to symdiff must be slices or arrays")
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}
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}
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return slice.Interface(), nil
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}
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