github.com/linchen2chris/hugo@v0.0.0-20230307053224-cec209389705/hugolib/page__position.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 hugolib
    15  
    16  import (
    17  	"context"
    18  
    19  	"github.com/gohugoio/hugo/lazy"
    20  	"github.com/gohugoio/hugo/resources/page"
    21  )
    22  
    23  func newPagePosition(n *nextPrev) pagePosition {
    24  	return pagePosition{nextPrev: n}
    25  }
    26  
    27  func newPagePositionInSection(n *nextPrev) pagePositionInSection {
    28  	return pagePositionInSection{nextPrev: n}
    29  }
    30  
    31  type nextPrev struct {
    32  	init     *lazy.Init
    33  	prevPage page.Page
    34  	nextPage page.Page
    35  }
    36  
    37  func (n *nextPrev) next() page.Page {
    38  	n.init.Do(context.Background())
    39  	return n.nextPage
    40  }
    41  
    42  func (n *nextPrev) prev() page.Page {
    43  	n.init.Do(context.Background())
    44  	return n.prevPage
    45  }
    46  
    47  type pagePosition struct {
    48  	*nextPrev
    49  }
    50  
    51  func (p pagePosition) Next() page.Page {
    52  	return p.next()
    53  }
    54  
    55  func (p pagePosition) NextPage() page.Page {
    56  	return p.Next()
    57  }
    58  
    59  func (p pagePosition) Prev() page.Page {
    60  	return p.prev()
    61  }
    62  
    63  func (p pagePosition) PrevPage() page.Page {
    64  	return p.Prev()
    65  }
    66  
    67  type pagePositionInSection struct {
    68  	*nextPrev
    69  }
    70  
    71  func (p pagePositionInSection) NextInSection() page.Page {
    72  	return p.next()
    73  }
    74  
    75  func (p pagePositionInSection) PrevInSection() page.Page {
    76  	return p.prev()
    77  }