unified

Project: syntax-tree/mdast-util-toc

Package: mdast-util-toc@5.0.3

  1. Dependencies: 7·Dependents: 44
  2. mdast utility to generate a table of contents from a tree
  1. markdown 133
  2. util 118
  3. utility 114
  4. unist 110
  5. mdast 81
  6. mdast-util 24
  7. table 12
  8. toc 4
  9. contents 3

mdast-util-toc

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mdast utility to generate table of contents.

Install

npm:

npm install mdast-util-toc

Use

Dependencies:

var u = require('unist-builder')
var toc = require('mdast-util-toc')

Given a mdast tree:

var tree = u('root', [
  u('heading', {depth: 1}, [u('text', 'Alpha')]),
  u('heading', {depth: 2}, [u('text', 'Bravo')]),
  u('heading', {depth: 3}, [u('text', 'Charlie')]),
  u('heading', {depth: 2}, [u('text', 'Delta')])
])

var table = toc(tree)

Yields:

{
  index: null,
  endIndex: null,
  map: {
    type: 'list',
    ordered: false,
    spread: true,
    children: [ { type: 'listItem', spread: true, children: [Array] } ]
  }
}

API

toc(tree[, options])

Generate a Table of Contents from a tree.

Looks for the first heading matching options.heading (case insensitive, supports alt/title attributes for links and images too), and returns a table of contents (list) for all following headings. If no heading is specified, creates a table of contents for all headings in tree. tree is not changed.

Links to headings are based on GitHub’s style. Only top-level headings (those not in blockquotes or lists), are used. This default behavior can be changed by passing parents.

options
options.heading

Heading to look for (string), wrapped in new RegExp('^(' + value + ')$', 'i').

options.maxDepth

Maximum heading depth to include in the table of contents (number, default: 6), This is inclusive: when set to 3, level three headings are included (those with three hashes, ###).

options.skip

Headings to skip (string, optional), wrapped in new RegExp('^(' + value + ')$', 'i'). Any heading matching this expression will not be present in the table of contents.

options.tight

Whether to compile list-items tightly (boolean?, default: false).

options.prefix

Add a prefix to links to headings in the table of contents (string?, default: null). Useful for example when later going from mdast to hast and sanitizing with hast-util-sanitize.

options.parents

Allows headings to be children of certain node types (default: the to toc given tree, to only allow top-level headings). Internally, uses unist-util-is to check, so parents can be any is-compatible test.

For example, this would allow headings under either root or blockquote to be used:

toc(tree, {parents: ['root', 'blockquote']})
Returns

An object representing the table of contents.

Properties

Security

Use of mdast-util-toc does not involve hast, user content, or change the tree, so there are no openings for cross-site scripting (XSS) attacks.

Injecting map into the syntax tree may open you up to XSS attacks as existing nodes are copied into the table of contents. The following example shows how an existing script is copied into the table of contents.

For the following Markdown:

# Alpha

## Bravo<script>alert(1)</script>

## Charlie

Yields in map:

-   [Alpha](#alpha)

    -   [Bravo<script>alert(1)</script>](#bravoscriptalert1script)
    -   [Charlie](#charlie)

Always use hast-util-santize when transforming to hast.

Contribute

See contributing.md in syntax-tree/.github for ways to get started. See support.md for ways to get help.

This project has a code of conduct. By interacting with this repository, organization, or community you agree to abide by its terms.

License

MIT © Jonathan Haines