129 lines
2.9 KiB
Go
129 lines
2.9 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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"github.com/gohugoio/hugo/markup/tableofcontents"
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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/parser"
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"github.com/yuin/goldmark/renderer"
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"github.com/yuin/goldmark/text"
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"github.com/yuin/goldmark/util"
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)
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var (
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tocResultKey = parser.NewContextKey()
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tocEnableKey = parser.NewContextKey()
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)
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type tocTransformer struct {
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r renderer.Renderer
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}
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func (t *tocTransformer) Transform(n *ast.Document, reader text.Reader, pc parser.Context) {
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if b, ok := pc.Get(tocEnableKey).(bool); !ok || !b {
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return
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}
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var (
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toc tableofcontents.Root
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tocHeading tableofcontents.Heading
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level int
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row = -1
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inHeading bool
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headingText bytes.Buffer
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)
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ast.Walk(n, func(n ast.Node, entering bool) (ast.WalkStatus, error) {
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s := ast.WalkStatus(ast.WalkContinue)
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if n.Kind() == ast.KindHeading {
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if inHeading && !entering {
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tocHeading.Text = headingText.String()
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headingText.Reset()
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toc.AddAt(tocHeading, row, level-1)
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tocHeading = tableofcontents.Heading{}
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inHeading = false
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return s, nil
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}
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inHeading = true
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}
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if !(inHeading && entering) {
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return s, nil
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}
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switch n.Kind() {
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case ast.KindHeading:
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heading := n.(*ast.Heading)
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level = heading.Level
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if level == 1 || row == -1 {
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row++
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}
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id, found := heading.AttributeString("id")
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if found {
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tocHeading.ID = string(id.([]byte))
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}
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case
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ast.KindCodeSpan,
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ast.KindLink,
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ast.KindImage,
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ast.KindEmphasis:
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err := t.r.Render(&headingText, reader.Source(), n)
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if err != nil {
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return s, err
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}
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return ast.WalkSkipChildren, nil
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case
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ast.KindAutoLink,
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ast.KindRawHTML,
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ast.KindText,
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ast.KindString:
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err := t.r.Render(&headingText, reader.Source(), n)
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if err != nil {
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return s, err
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}
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}
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return s, nil
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})
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pc.Set(tocResultKey, toc)
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}
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type tocExtension struct {
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options []renderer.Option
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}
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func newTocExtension(options []renderer.Option) goldmark.Extender {
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return &tocExtension{
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options: options,
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}
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}
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func (e *tocExtension) Extend(m goldmark.Markdown) {
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r := goldmark.DefaultRenderer()
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r.AddOptions(e.options...)
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m.Parser().AddOptions(parser.WithASTTransformers(util.Prioritized(&tocTransformer{
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r: r,
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}, 10)))
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}
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