/
githubmirror
/
hugo
Обзор
Документация
Войти
/
githubmirror
/
hugo
Код
Запросы
0
Пакеты
0
Релизы
0
Аналитика
Безопасность
master
tpl/collections/complement.go
59 строк
2 KB
Bjørn Erik Pedersen
all: Simplify the reflect usage
26 окт 2025, 19:36
26 окт 2025, 19:36
3893e70
Код
Авторство
О чём код?
// Copyright 2018 The Hugo Authors. All rights reserved. // // 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 collections import ( "errors" "fmt" "reflect" "github.com/gohugoio/hugo/common/hreflect" ) // Complement gives the elements in the last element of ls that are not in // any of the others. // // All elements of ls must be slices or arrays of comparable types. // // The reasoning behind this rather clumsy API is so we can do this in the templates: // // {{ $c := .Pages | complement $last4 }} func (ns *Namespace) Complement(ls ...any) (any, error) { if len(ls) < 2 { return nil, errors.New("complement needs at least two arguments") } universe := ls[len(ls)-1] as := ls[:len(ls)-1] aset, err := collectIdentities(as...) if err != nil { return nil, err } v := reflect.ValueOf(universe) switch v.Kind() { case reflect.Array, reflect.Slice: sl := reflect.MakeSlice(v.Type(), 0, 0) for i := range v.Len() { ev, _ := hreflect.Indirect(v.Index(i)) if _, found := aset[normalize(ev)]; !found { sl = reflect.Append(sl, ev) } } return sl.Interface(), nil default: return nil, fmt.Errorf("arguments to complement must be slices or arrays") } }