mirror of
https://github.com/gohugoio/hugo.git
synced 2024-12-27 21:10:51 +00:00
449 lines
11 KiB
Go
449 lines
11 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 goldmark
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import (
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"bytes"
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"strings"
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"sync"
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"github.com/spf13/cast"
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"github.com/gohugoio/hugo/markup/converter/hooks"
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"github.com/yuin/goldmark"
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"github.com/yuin/goldmark/ast"
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"github.com/yuin/goldmark/renderer"
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"github.com/yuin/goldmark/renderer/html"
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"github.com/yuin/goldmark/util"
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)
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var _ renderer.SetOptioner = (*hookedRenderer)(nil)
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func newLinkRenderer() renderer.NodeRenderer {
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r := &hookedRenderer{
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Config: html.Config{
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Writer: html.DefaultWriter,
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},
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}
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return r
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}
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func newLinks() goldmark.Extender {
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return &links{}
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}
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type attributesHolder struct {
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// What we get from Goldmark.
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astAttributes []ast.Attribute
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// What we send to the the render hooks.
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attributesInit sync.Once
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attributes map[string]string
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}
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func (a *attributesHolder) Attributes() map[string]string {
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a.attributesInit.Do(func() {
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a.attributes = make(map[string]string)
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for _, attr := range a.astAttributes {
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a.attributes[string(attr.Name)] = string(util.EscapeHTML(attr.Value.([]byte)))
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}
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})
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return a.attributes
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}
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type linkContext struct {
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page interface{}
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destination string
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title string
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text string
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plainText string
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}
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func (ctx linkContext) Destination() string {
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return ctx.destination
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}
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func (ctx linkContext) Resolved() bool {
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return false
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}
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func (ctx linkContext) Page() interface{} {
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return ctx.page
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}
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func (ctx linkContext) Text() string {
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return ctx.text
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}
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func (ctx linkContext) PlainText() string {
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return ctx.plainText
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}
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func (ctx linkContext) Title() string {
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return ctx.title
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}
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type headingContext struct {
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page interface{}
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level int
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anchor string
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text string
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plainText string
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*attributesHolder
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}
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func (ctx headingContext) Page() interface{} {
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return ctx.page
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}
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func (ctx headingContext) Level() int {
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return ctx.level
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}
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func (ctx headingContext) Anchor() string {
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return ctx.anchor
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}
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func (ctx headingContext) Text() string {
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return ctx.text
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}
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func (ctx headingContext) PlainText() string {
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return ctx.plainText
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}
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type hookedRenderer struct {
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html.Config
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}
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func (r *hookedRenderer) SetOption(name renderer.OptionName, value interface{}) {
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r.Config.SetOption(name, value)
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}
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// RegisterFuncs implements NodeRenderer.RegisterFuncs.
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func (r *hookedRenderer) RegisterFuncs(reg renderer.NodeRendererFuncRegisterer) {
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reg.Register(ast.KindLink, r.renderLink)
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reg.Register(ast.KindAutoLink, r.renderAutoLink)
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reg.Register(ast.KindImage, r.renderImage)
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reg.Register(ast.KindHeading, r.renderHeading)
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}
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func (r *hookedRenderer) renderAttributesForNode(w util.BufWriter, node ast.Node) {
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renderAttributes(w, false, node.Attributes()...)
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}
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var (
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// Attributes with special meaning that does not make sense to render in HTML.
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attributeExcludes = map[string]bool{
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"linenos": true,
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"hl_lines": true,
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"linenostart": true,
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}
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)
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func renderAttributes(w util.BufWriter, skipClass bool, attributes ...ast.Attribute) {
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for _, attr := range attributes {
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if skipClass && bytes.Equal(attr.Name, []byte("class")) {
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continue
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}
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if attributeExcludes[string(attr.Name)] {
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continue
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}
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_, _ = w.WriteString(" ")
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_, _ = w.Write(attr.Name)
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_, _ = w.WriteString(`="`)
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switch v := attr.Value.(type) {
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case []byte:
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_, _ = w.Write(util.EscapeHTML(v))
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default:
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w.WriteString(cast.ToString(v))
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}
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_ = w.WriteByte('"')
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}
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}
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func (r *hookedRenderer) renderImage(w util.BufWriter, source []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
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n := node.(*ast.Image)
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var h hooks.Renderers
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ctx, ok := w.(*renderContext)
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if ok {
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h = ctx.RenderContext().RenderHooks
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ok = h.ImageRenderer != nil
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}
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if !ok {
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return r.renderImageDefault(w, source, node, entering)
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}
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if entering {
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// Store the current pos so we can capture the rendered text.
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ctx.pos = ctx.Buffer.Len()
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return ast.WalkContinue, nil
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}
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text := ctx.Buffer.Bytes()[ctx.pos:]
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ctx.Buffer.Truncate(ctx.pos)
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err := h.ImageRenderer.RenderLink(
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w,
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linkContext{
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page: ctx.DocumentContext().Document,
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destination: string(n.Destination),
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title: string(n.Title),
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text: string(text),
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plainText: string(n.Text(source)),
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},
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)
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ctx.AddIdentity(h.ImageRenderer)
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return ast.WalkContinue, err
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}
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// Fall back to the default Goldmark render funcs. Method below borrowed from:
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// https://github.com/yuin/goldmark/blob/b611cd333a492416b56aa8d94b04a67bf0096ab2/renderer/html/html.go#L404
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func (r *hookedRenderer) renderImageDefault(w util.BufWriter, source []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
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if !entering {
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return ast.WalkContinue, nil
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}
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n := node.(*ast.Image)
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_, _ = w.WriteString("<img src=\"")
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if r.Unsafe || !html.IsDangerousURL(n.Destination) {
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_, _ = w.Write(util.EscapeHTML(util.URLEscape(n.Destination, true)))
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}
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_, _ = w.WriteString(`" alt="`)
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_, _ = w.Write(n.Text(source))
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_ = w.WriteByte('"')
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if n.Title != nil {
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_, _ = w.WriteString(` title="`)
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r.Writer.Write(w, n.Title)
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_ = w.WriteByte('"')
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}
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if r.XHTML {
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_, _ = w.WriteString(" />")
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} else {
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_, _ = w.WriteString(">")
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}
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return ast.WalkSkipChildren, nil
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}
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func (r *hookedRenderer) renderLink(w util.BufWriter, source []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
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n := node.(*ast.Link)
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var h hooks.Renderers
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ctx, ok := w.(*renderContext)
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if ok {
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h = ctx.RenderContext().RenderHooks
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ok = h.LinkRenderer != nil
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}
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if !ok {
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return r.renderLinkDefault(w, source, node, entering)
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}
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if entering {
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// Store the current pos so we can capture the rendered text.
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ctx.pos = ctx.Buffer.Len()
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return ast.WalkContinue, nil
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}
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text := ctx.Buffer.Bytes()[ctx.pos:]
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ctx.Buffer.Truncate(ctx.pos)
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err := h.LinkRenderer.RenderLink(
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w,
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linkContext{
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page: ctx.DocumentContext().Document,
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destination: string(n.Destination),
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title: string(n.Title),
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text: string(text),
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plainText: string(n.Text(source)),
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},
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)
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// TODO(bep) I have a working branch that fixes these rather confusing identity types,
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// but for now it's important that it's not .GetIdentity() that's added here,
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// to make sure we search the entire chain on changes.
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ctx.AddIdentity(h.LinkRenderer)
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return ast.WalkContinue, err
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}
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// Fall back to the default Goldmark render funcs. Method below borrowed from:
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// https://github.com/yuin/goldmark/blob/b611cd333a492416b56aa8d94b04a67bf0096ab2/renderer/html/html.go#L404
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func (r *hookedRenderer) renderLinkDefault(w util.BufWriter, source []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
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n := node.(*ast.Link)
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if entering {
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_, _ = w.WriteString("<a href=\"")
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if r.Unsafe || !html.IsDangerousURL(n.Destination) {
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_, _ = w.Write(util.EscapeHTML(util.URLEscape(n.Destination, true)))
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}
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_ = w.WriteByte('"')
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if n.Title != nil {
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_, _ = w.WriteString(` title="`)
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r.Writer.Write(w, n.Title)
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_ = w.WriteByte('"')
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}
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_ = w.WriteByte('>')
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} else {
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_, _ = w.WriteString("</a>")
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}
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return ast.WalkContinue, nil
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}
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func (r *hookedRenderer) renderAutoLink(w util.BufWriter, source []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
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if !entering {
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return ast.WalkContinue, nil
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}
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n := node.(*ast.AutoLink)
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var h hooks.Renderers
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ctx, ok := w.(*renderContext)
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if ok {
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h = ctx.RenderContext().RenderHooks
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ok = h.LinkRenderer != nil
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}
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if !ok {
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return r.renderAutoLinkDefault(w, source, node, entering)
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}
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url := string(n.URL(source))
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label := string(n.Label(source))
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if n.AutoLinkType == ast.AutoLinkEmail && !strings.HasPrefix(strings.ToLower(url), "mailto:") {
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url = "mailto:" + url
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}
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err := h.LinkRenderer.RenderLink(
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w,
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linkContext{
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page: ctx.DocumentContext().Document,
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destination: url,
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text: label,
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plainText: label,
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},
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)
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// TODO(bep) I have a working branch that fixes these rather confusing identity types,
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// but for now it's important that it's not .GetIdentity() that's added here,
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// to make sure we search the entire chain on changes.
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ctx.AddIdentity(h.LinkRenderer)
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return ast.WalkContinue, err
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}
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// Fall back to the default Goldmark render funcs. Method below borrowed from:
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// https://github.com/yuin/goldmark/blob/5588d92a56fe1642791cf4aa8e9eae8227cfeecd/renderer/html/html.go#L439
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func (r *hookedRenderer) renderAutoLinkDefault(w util.BufWriter, source []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
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n := node.(*ast.AutoLink)
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if !entering {
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return ast.WalkContinue, nil
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}
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_, _ = w.WriteString(`<a href="`)
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url := n.URL(source)
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label := n.Label(source)
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if n.AutoLinkType == ast.AutoLinkEmail && !bytes.HasPrefix(bytes.ToLower(url), []byte("mailto:")) {
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_, _ = w.WriteString("mailto:")
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}
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_, _ = w.Write(util.EscapeHTML(util.URLEscape(url, false)))
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if n.Attributes() != nil {
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_ = w.WriteByte('"')
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html.RenderAttributes(w, n, html.LinkAttributeFilter)
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_ = w.WriteByte('>')
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} else {
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_, _ = w.WriteString(`">`)
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}
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_, _ = w.Write(util.EscapeHTML(label))
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_, _ = w.WriteString(`</a>`)
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return ast.WalkContinue, nil
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}
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func (r *hookedRenderer) renderHeading(w util.BufWriter, source []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
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n := node.(*ast.Heading)
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var h hooks.Renderers
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ctx, ok := w.(*renderContext)
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if ok {
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h = ctx.RenderContext().RenderHooks
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ok = h.HeadingRenderer != nil
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}
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if !ok {
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return r.renderHeadingDefault(w, source, node, entering)
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}
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if entering {
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// Store the current pos so we can capture the rendered text.
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ctx.pos = ctx.Buffer.Len()
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return ast.WalkContinue, nil
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}
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text := ctx.Buffer.Bytes()[ctx.pos:]
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ctx.Buffer.Truncate(ctx.pos)
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// All ast.Heading nodes are guaranteed to have an attribute called "id"
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// that is an array of bytes that encode a valid string.
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anchori, _ := n.AttributeString("id")
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anchor := anchori.([]byte)
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err := h.HeadingRenderer.RenderHeading(
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w,
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headingContext{
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page: ctx.DocumentContext().Document,
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level: n.Level,
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anchor: string(anchor),
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text: string(text),
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plainText: string(n.Text(source)),
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attributesHolder: &attributesHolder{astAttributes: n.Attributes()},
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},
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)
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ctx.AddIdentity(h.HeadingRenderer)
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return ast.WalkContinue, err
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}
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func (r *hookedRenderer) renderHeadingDefault(w util.BufWriter, source []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
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n := node.(*ast.Heading)
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if entering {
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_, _ = w.WriteString("<h")
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_ = w.WriteByte("0123456"[n.Level])
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if n.Attributes() != nil {
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r.renderAttributesForNode(w, node)
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}
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_ = w.WriteByte('>')
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} else {
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_, _ = w.WriteString("</h")
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_ = w.WriteByte("0123456"[n.Level])
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_, _ = w.WriteString(">\n")
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}
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return ast.WalkContinue, nil
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}
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type links struct {
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}
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// Extend implements goldmark.Extender.
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func (e *links) Extend(m goldmark.Markdown) {
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m.Renderer().AddOptions(renderer.WithNodeRenderers(
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util.Prioritized(newLinkRenderer(), 100),
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))
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}
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