hugo/navigation/pagemenus.go

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// Copyright 2019 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 navigation
import (
"github.com/gohugoio/hugo/common/maps"
"github.com/gohugoio/hugo/common/types"
"github.com/pkg/errors"
"github.com/spf13/cast"
)
type PageMenusProvider interface {
PageMenusGetter
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MenuQueryProvider
}
type PageMenusGetter interface {
Menus() PageMenus
}
type MenusGetter interface {
Menus() Menus
}
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type MenuQueryProvider interface {
HasMenuCurrent(menuID string, me *MenuEntry) bool
IsMenuCurrent(menuID string, inme *MenuEntry) bool
}
func PageMenusFromPage(p Page) (PageMenus, error) {
params := p.Params()
ms, ok := params["menus"]
if !ok {
ms, ok = params["menu"]
}
pm := PageMenus{}
if !ok {
return nil, nil
}
me := MenuEntry{Page: p, Name: p.LinkTitle(), Weight: p.Weight()}
// Could be the name of the menu to attach it to
mname, err := cast.ToStringE(ms)
if err == nil {
me.Menu = mname
pm[mname] = &me
return pm, nil
}
// Could be a slice of strings
mnames, err := cast.ToStringSliceE(ms)
if err == nil {
for _, mname := range mnames {
me.Menu = mname
pm[mname] = &me
}
return pm, nil
}
var wrapErr = func(err error) error {
return errors.Wrapf(err, "unable to process menus for page %q", p.Path())
}
// Could be a structured menu entry
menus, err := maps.ToStringMapE(ms)
if err != nil {
return pm, wrapErr(err)
}
for name, menu := range menus {
menuEntry := MenuEntry{Page: p, Name: p.LinkTitle(), Weight: p.Weight(), Menu: name}
if menu != nil {
ime, err := maps.ToStringMapE(menu)
if err != nil {
return pm, wrapErr(err)
}
if err = menuEntry.MarshallMap(ime); err != nil {
return pm, wrapErr(err)
}
}
pm[name] = &menuEntry
}
return pm, nil
}
func NewMenuQueryProvider(
pagem PageMenusGetter,
sitem MenusGetter,
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p Page) MenuQueryProvider {
return &pageMenus{
p: p,
pagem: pagem,
sitem: sitem,
}
}
type pageMenus struct {
pagem PageMenusGetter
sitem MenusGetter
p Page
}
func (pm *pageMenus) HasMenuCurrent(menuID string, me *MenuEntry) bool {
if !types.IsNil(me.Page) && me.Page.IsSection() {
if ok, _ := me.Page.IsAncestor(pm.p); ok {
return true
}
}
if !me.HasChildren() {
return false
}
menus := pm.pagem.Menus()
if m, ok := menus[menuID]; ok {
for _, child := range me.Children {
if child.IsEqual(m) {
return true
}
if pm.HasMenuCurrent(menuID, child) {
return true
}
}
}
if pm.p == nil {
return false
}
for _, child := range me.Children {
if child.isSamePage(pm.p) {
return true
}
if pm.HasMenuCurrent(menuID, child) {
return true
}
}
return false
}
func (pm *pageMenus) IsMenuCurrent(menuID string, inme *MenuEntry) bool {
menus := pm.pagem.Menus()
if me, ok := menus[menuID]; ok {
if me.IsEqual(inme) {
return true
}
}
if pm.p == nil {
return false
}
if !inme.isSamePage(pm.p) {
return false
}
// This resource may be included in several menus.
// Search for it to make sure that it is in the menu with the given menuId.
if menu, ok := pm.sitem.Menus()[menuID]; ok {
for _, menuEntry := range menu {
if menuEntry.IsSameResource(inme) {
return true
}
descendantFound := pm.isSameAsDescendantMenu(inme, menuEntry)
if descendantFound {
return descendantFound
}
}
}
return false
}
func (pm *pageMenus) isSameAsDescendantMenu(inme *MenuEntry, parent *MenuEntry) bool {
if parent.HasChildren() {
for _, child := range parent.Children {
if child.IsSameResource(inme) {
return true
}
descendantFound := pm.isSameAsDescendantMenu(inme, child)
if descendantFound {
return descendantFound
}
}
}
return false
}
var NopPageMenus = new(nopPageMenus)
type nopPageMenus int
func (m nopPageMenus) Menus() PageMenus {
return PageMenus{}
}
func (m nopPageMenus) HasMenuCurrent(menuID string, me *MenuEntry) bool {
return false
}
func (m nopPageMenus) IsMenuCurrent(menuID string, inme *MenuEntry) bool {
return false
}