mirror of
https://github.com/gohugoio/hugo.git
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125 lines
3.3 KiB
Go
125 lines
3.3 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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"html/template"
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"github.com/gohugoio/hugo/lazy"
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)
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// OutputFormatContentProvider represents the method set that is "outputFormat aware" and that we
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// provide lazy initialization for in case they get invoked outside of their normal rendering context, e.g. via .Translations.
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// Note that this set is currently not complete, but should cover the most common use cases.
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// For the others, the implementation will be from the page.NoopPage.
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type OutputFormatContentProvider interface {
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ContentProvider
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TableOfContentsProvider
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PageRenderProvider
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}
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// LazyContentProvider initializes itself when read. Each method of the
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// ContentProvider interface initializes a content provider and shares it
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// with other methods.
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//
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// Used in cases where we cannot guarantee whether the content provider
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// will be needed. Must create via NewLazyContentProvider.
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type LazyContentProvider struct {
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init *lazy.Init
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cp OutputFormatContentProvider
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}
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// NewLazyContentProvider returns a LazyContentProvider initialized with
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// function f. The resulting LazyContentProvider calls f in order to
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// retrieve a ContentProvider
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func NewLazyContentProvider(f func() (OutputFormatContentProvider, error)) *LazyContentProvider {
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lcp := LazyContentProvider{
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init: lazy.New(),
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cp: NopPage,
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}
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lcp.init.Add(func() (interface{}, error) {
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cp, err := f()
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if err != nil {
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return nil, err
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}
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lcp.cp = cp
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return nil, nil
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})
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return &lcp
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}
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func (lcp *LazyContentProvider) Reset() {
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lcp.init.Reset()
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}
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func (lcp *LazyContentProvider) Content() (interface{}, error) {
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lcp.init.Do()
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return lcp.cp.Content()
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}
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func (lcp *LazyContentProvider) Plain() string {
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lcp.init.Do()
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return lcp.cp.Plain()
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}
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func (lcp *LazyContentProvider) PlainWords() []string {
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lcp.init.Do()
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return lcp.cp.PlainWords()
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}
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func (lcp *LazyContentProvider) Summary() template.HTML {
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lcp.init.Do()
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return lcp.cp.Summary()
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}
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func (lcp *LazyContentProvider) Truncated() bool {
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lcp.init.Do()
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return lcp.cp.Truncated()
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}
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func (lcp *LazyContentProvider) FuzzyWordCount() int {
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lcp.init.Do()
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return lcp.cp.FuzzyWordCount()
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}
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func (lcp *LazyContentProvider) WordCount() int {
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lcp.init.Do()
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return lcp.cp.WordCount()
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}
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func (lcp *LazyContentProvider) ReadingTime() int {
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lcp.init.Do()
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return lcp.cp.ReadingTime()
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}
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func (lcp *LazyContentProvider) Len() int {
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lcp.init.Do()
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return lcp.cp.Len()
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}
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func (lcp *LazyContentProvider) Render(layout ...string) (template.HTML, error) {
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lcp.init.Do()
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return lcp.cp.Render(layout...)
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}
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func (lcp *LazyContentProvider) RenderString(args ...interface{}) (template.HTML, error) {
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lcp.init.Do()
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return lcp.cp.RenderString(args...)
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}
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func (lcp *LazyContentProvider) TableOfContents() template.HTML {
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lcp.init.Do()
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return lcp.cp.TableOfContents()
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}
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