1// Copyright 2019 The Hugo Authors. All rights reserved.
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6// http://www.apache.org/licenses/LICENSE-2.0
7//
8// Unless required by applicable law or agreed to in writing, software
9// distributed under the License is distributed on an "AS IS" BASIS,
10// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
11// See the License for the specific language governing permissions and
12// limitations under the License.
13
14package hugolib
15
16import (
17	"github.com/gohugoio/hugo/common/collections"
18	"github.com/gohugoio/hugo/resources/page"
19)
20
21var (
22	_ collections.Grouper = (*pageState)(nil)
23	_ collections.Slicer  = (*pageState)(nil)
24)
25
26// collections.Slicer implementations below. We keep these bridge implementations
27// here as it makes it easier to get an idea of "type coverage". These
28// implementations have no value on their own.
29
30// Slice is not meant to be used externally. It's a bridge function
31func (p *pageState) Slice(items interface{}) (interface{}, error) {
32	return page.ToPages(items)
33}
34
35// collections.Grouper  implementations below
36
37// Group creates a PageGroup from a key and a Pages object
38// This method is not meant for external use. It got its non-typed arguments to satisfy
39// a very generic interface in the tpl package.
40func (p *pageState) Group(key interface{}, in interface{}) (interface{}, error) {
41	pages, err := page.ToPages(in)
42	if err != nil {
43		return nil, err
44	}
45	return page.PageGroup{Key: key, Pages: pages}, nil
46}
47