mirror of
https://github.com/gohugoio/hugo.git
synced 2024-11-21 20:46:30 -05:00
31a8bb8c07
This commit consolidates the reflective collections handling in `.Scratch` vs the `tpl` package so they use the same code paths.
This commit also adds support for a corner case where a typed slice is appended to a nil or empty `[]interface{}`.
Fixes #5275
66 lines
1.7 KiB
Go
66 lines
1.7 KiB
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 definse 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 interface{}) (interface{}, error)
|
|
}
|
|
|
|
// Slice returns a slice of all passed arguments.
|
|
func Slice(args ...interface{}) interface{} {
|
|
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()
|
|
}
|