152 lines
3.0 KiB
Go
152 lines
3.0 KiB
Go
// Copyright 2019 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 page
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import (
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"fmt"
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"math/rand"
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"github.com/gohugoio/hugo/compare"
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"github.com/gohugoio/hugo/resources/resource"
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)
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var (
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_ resource.ResourcesConverter = Pages{}
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_ compare.ProbablyEqer = Pages{}
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)
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// Pages is a slice of pages. This is the most common list type in Hugo.
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type Pages []Page
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func (ps Pages) String() string {
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return fmt.Sprintf("Pages(%d)", len(ps))
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}
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// Used in tests.
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func (ps Pages) shuffle() {
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for i := range ps {
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j := rand.Intn(i + 1)
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ps[i], ps[j] = ps[j], ps[i]
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}
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}
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// ToResources wraps resource.ResourcesConverter
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func (pages Pages) ToResources() resource.Resources {
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r := make(resource.Resources, len(pages))
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for i, p := range pages {
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r[i] = p
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}
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return r
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}
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// ToPages tries to convert seq into Pages.
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func ToPages(seq interface{}) (Pages, error) {
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if seq == nil {
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return Pages{}, nil
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}
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switch v := seq.(type) {
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case Pages:
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return v, nil
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case *Pages:
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return *(v), nil
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case WeightedPages:
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return v.Pages(), nil
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case PageGroup:
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return v.Pages, nil
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case []Page:
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pages := make(Pages, len(v))
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for i, vv := range v {
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pages[i] = vv
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}
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return pages, nil
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case []interface{}:
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pages := make(Pages, len(v))
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success := true
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for i, vv := range v {
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p, ok := vv.(Page)
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if !ok {
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success = false
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break
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}
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pages[i] = p
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}
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if success {
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return pages, nil
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}
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}
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return nil, fmt.Errorf("cannot convert type %T to Pages", seq)
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}
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func (p Pages) Group(key interface{}, in interface{}) (interface{}, error) {
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pages, err := ToPages(in)
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if err != nil {
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return nil, err
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}
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return PageGroup{Key: key, Pages: pages}, nil
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}
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// Len returns the number of pages in the list.
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func (p Pages) Len() int {
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return len(p)
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}
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// ProbablyEq wraps compare.ProbablyEqer
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func (pages Pages) ProbablyEq(other interface{}) bool {
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otherPages, ok := other.(Pages)
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if !ok {
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return false
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}
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if len(pages) != len(otherPages) {
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return false
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}
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step := 1
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for i := 0; i < len(pages); i += step {
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if !pages[i].Eq(otherPages[i]) {
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return false
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}
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if i > 50 {
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// This is most likely the same.
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step = 50
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}
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}
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return true
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}
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func (ps Pages) removeFirstIfFound(p Page) Pages {
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ii := -1
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for i, pp := range ps {
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if p.Eq(pp) {
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ii = i
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break
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}
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}
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if ii != -1 {
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ps = append(ps[:ii], ps[ii+1:]...)
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}
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return ps
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}
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// PagesFactory somehow creates some Pages.
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// We do a lot of lazy Pages initialization in Hugo, so we need a type.
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type PagesFactory func() Pages
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