pages_prev_next.go (967B)
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
14 package page
15
16 // Next returns the next page relative to the given
17 func (p Pages) Next(cur Page) Page {
18 x := searchPage(cur, p)
19 if x <= 0 {
20 return nil
21 }
22 return p[x-1]
23 }
24
25 // Prev returns the previous page reletive to the given
26 func (p Pages) Prev(cur Page) Page {
27 x := searchPage(cur, p)
28
29 if x == -1 || len(p)-x < 2 {
30 return nil
31 }
32
33 return p[x+1]
34 }