hugo slice 源码
hugo slice 代码
文件路径：/common/collections/slice.go
// 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 (
"reflect"
)
// Slicer defines a very generic way to create a typed slice. This is used
// in collections.Slice template func to get types such as Pages, PageGroups etc.
// instead of the less useful []interface{}.
type Slicer interface {
Slice(items any) (any, error)
}
// Slice returns a slice of all passed arguments.
func Slice(args ...any) any {
if len(args) == 0 {
return args
}
first := args[0]
firstType := reflect.TypeOf(first)
if firstType == nil {
return args
}
if g, ok := first.(Slicer); ok {
v, err := g.Slice(args)
if err == nil {
return v
}
// If Slice fails, the items are not of the same type and
// []interface{} is the best we can do.
return args
}
if len(args) > 1 {
// This can be a mix of types.
for i := 1; i < len(args); i++ {
if firstType != reflect.TypeOf(args[i]) {
// []interface{} is the best we can do
return args
}
}
}
slice := reflect.MakeSlice(reflect.SliceOf(firstType), len(args), len(args))
for i, arg := range args {
slice.Index(i).Set(reflect.ValueOf(arg))
}
return slice.Interface()
}
// StringSliceToInterfaceSlice converts ss to []interface{}.
func StringSliceToInterfaceSlice(ss []string) []any {
result := make([]any, len(ss))
for i, s := range ss {
result[i] = s
}
return result
}
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