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hugo/hugolib/taxonomy.go
Robert Basic 7d5c9fbf44 Make ByCount sort consistently
When two or more taxonomies have the same number of pages,
sort them by name to have consistent ByCount sorting of
taxonomies.

Fixes 
2016-04-02 22:59:10 +02:00

228 lines
6.1 KiB
Go

// Copyright 2015 The Hugo Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package hugolib
import (
"sort"
"github.com/spf13/hugo/helpers"
)
// The TaxonomyList is a list of all taxonomies and their values
// e.g. List['tags'] => TagTaxonomy (from above)
type TaxonomyList map[string]Taxonomy
// A Taxonomy is a map of keywords to a list of pages.
// For example
// TagTaxonomy['technology'] = WeightedPages
// TagTaxonomy['go'] = WeightedPages2
type Taxonomy map[string]WeightedPages
// WeightedPages is a list of Pages with their corresponding (and relative) weight
// [{Weight: 30, Page: *1}, {Weight: 40, Page: *2}]
type WeightedPages []WeightedPage
// A WeightedPage is a Page with a weight.
type WeightedPage struct {
Weight int
Page *Page
}
// OrderedTaxonomy is another representation of an Taxonomy using an array rather than a map.
// Important because you can't order a map.
type OrderedTaxonomy []OrderedTaxonomyEntry
// OrderedTaxonomyEntry is similar to an element of a Taxonomy, but with the key embedded (as name)
// e.g: {Name: Technology, WeightedPages: Taxonomyedpages}
type OrderedTaxonomyEntry struct {
Name string
WeightedPages WeightedPages
}
// KeyPrep... Taxonomies should be case insensitive. Can make it easily conditional later.
func kp(in string) string {
return helpers.MakePathSanitized(in)
}
// Get the weighted pages for the given key.
func (i Taxonomy) Get(key string) WeightedPages {
if val, ok := i[key]; ok {
return val
}
return i[kp(key)]
}
// Count the weighted pages for the given key.
func (i Taxonomy) Count(key string) int { return len(i[kp(key)]) }
func (i Taxonomy) add(key string, w WeightedPage, pretty bool) {
if !pretty {
key = kp(key)
}
i[key] = append(i[key], w)
}
// TaxonomyArray returns an ordered taxonomy with a non defined order.
func (i Taxonomy) TaxonomyArray() OrderedTaxonomy {
ies := make([]OrderedTaxonomyEntry, len(i))
count := 0
for k, v := range i {
ies[count] = OrderedTaxonomyEntry{Name: k, WeightedPages: v}
count++
}
return ies
}
// Alphabetical returns an ordered taxonomy sorted by key name.
func (i Taxonomy) Alphabetical() OrderedTaxonomy {
name := func(i1, i2 *OrderedTaxonomyEntry) bool {
return i1.Name < i2.Name
}
ia := i.TaxonomyArray()
oiBy(name).Sort(ia)
return ia
}
// ByCount returns an ordered taxonomy sorted by # of pages per key.
// If taxonomies have the same # of pages, sort them alphabetical
func (i Taxonomy) ByCount() OrderedTaxonomy {
count := func(i1, i2 *OrderedTaxonomyEntry) bool {
li1 := len(i1.WeightedPages)
li2 := len(i2.WeightedPages)
if li1 == li2 {
return i1.Name < i2.Name
}
return li1 > li2
}
ia := i.TaxonomyArray()
oiBy(count).Sort(ia)
return ia
}
// Pages returns the Pages for this taxonomy.
func (ie OrderedTaxonomyEntry) Pages() Pages {
return ie.WeightedPages.Pages()
}
// Count returns the count the pages in this taxonomy.
func (ie OrderedTaxonomyEntry) Count() int {
return len(ie.WeightedPages)
}
// Term returns the name given to this taxonomy.
func (ie OrderedTaxonomyEntry) Term() string {
return ie.Name
}
// Reverse reverses the order of the entries in this taxonomy.
func (t OrderedTaxonomy) Reverse() OrderedTaxonomy {
for i, j := 0, len(t)-1; i < j; i, j = i+1, j-1 {
t[i], t[j] = t[j], t[i]
}
return t
}
// A type to implement the sort interface for TaxonomyEntries.
type orderedTaxonomySorter struct {
taxonomy OrderedTaxonomy
by oiBy
}
// Closure used in the Sort.Less method.
type oiBy func(i1, i2 *OrderedTaxonomyEntry) bool
func (by oiBy) Sort(taxonomy OrderedTaxonomy) {
ps := &orderedTaxonomySorter{
taxonomy: taxonomy,
by: by, // The Sort method's receiver is the function (closure) that defines the sort order.
}
sort.Stable(ps)
}
// Len is part of sort.Interface.
func (s *orderedTaxonomySorter) Len() int {
return len(s.taxonomy)
}
// Swap is part of sort.Interface.
func (s *orderedTaxonomySorter) Swap(i, j int) {
s.taxonomy[i], s.taxonomy[j] = s.taxonomy[j], s.taxonomy[i]
}
// Less is part of sort.Interface. It is implemented by calling the "by" closure in the sorter.
func (s *orderedTaxonomySorter) Less(i, j int) bool {
return s.by(&s.taxonomy[i], &s.taxonomy[j])
}
// Pages returns the Pages in this weighted page set.
func (wp WeightedPages) Pages() Pages {
pages := make(Pages, len(wp))
for i := range wp {
pages[i] = wp[i].Page
}
return pages
}
// Prev returns the previous Page relative to the given Page in
// this weighted page set.
func (wp WeightedPages) Prev(cur *Page) *Page {
for x, c := range wp {
if c.Page.UniqueID() == cur.UniqueID() {
if x == 0 {
return wp[len(wp)-1].Page
}
return wp[x-1].Page
}
}
return nil
}
// Next returns the next Page relative to the given Page in
// this weighted page set.
func (wp WeightedPages) Next(cur *Page) *Page {
for x, c := range wp {
if c.Page.UniqueID() == cur.UniqueID() {
if x < len(wp)-1 {
return wp[x+1].Page
}
return wp[0].Page
}
}
return nil
}
func (wp WeightedPages) Len() int { return len(wp) }
func (wp WeightedPages) Swap(i, j int) { wp[i], wp[j] = wp[j], wp[i] }
// Sort stable sorts this weighted page set.
func (wp WeightedPages) Sort() { sort.Stable(wp) }
// Count returns the number of pages in this weighted page set.
func (wp WeightedPages) Count() int { return len(wp) }
func (wp WeightedPages) Less(i, j int) bool {
if wp[i].Weight == wp[j].Weight {
if wp[i].Page.Date.Equal(wp[j].Page.Date) {
return wp[i].Page.Title < wp[j].Page.Title
}
return wp[i].Page.Date.After(wp[i].Page.Date)
}
return wp[i].Weight < wp[j].Weight
}
// TODO mimic PagesSorter for WeightedPages