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