github.com/anakojm/hugo-katex@v0.0.0-20231023141351-42d6f5de9c0b/resources/page/pages_prev_next.go (about)

     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 relative 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  }