mdast-util-find-and-replace

mdast utility to find and replace things.

Contents

• What is this?
• When should I use this?
• Install
• Use
• API
  • findAndReplace(tree, find, replace[, options])
• Types
• Compatibility
• Security
• Related
• Contribute
• License

What is this?

This package is a utility that lets you find patterns (string, RegExp) in text and replace them with nodes.

When should I use this?

This utility is typically useful when you have regexes and want to modify mdast. One example is when you have some form of “mentions” (such as /@([a-z][_a-z0-9])\b/gi) and want to create links to persons from them.

A similar package, hast-util-find-and-replace does the same but on hast.

Install

This package is ESM only. In Node.js (version 12.20+, 14.14+, or 16.0+), install with npm:

npm install mdast-util-find-and-replace

In Deno with esm.sh:

import {findAndReplace} from 'https://esm.sh/mdast-util-find-and-replace@2'

In browsers with esm.sh:

<script type="module">
  import {findAndReplace} from 'https://esm.sh/mdast-util-find-and-replace@2?bundle'
</script>

Use

import {u} from 'unist-builder'
import {inspect} from 'unist-util-inspect'
import {findAndReplace} from 'mdast-util-find-and-replace'

const tree = u('paragraph', [
  u('text', 'Some '),
  u('emphasis', [u('text', 'emphasis')]),
  u('text', ' and '),
  u('strong', [u('text', 'importance')]),
  u('text', '.')
])

findAndReplace(tree, [
  [/and/gi, 'or'],
  [/emphasis/gi, 'em'],
  [/importance/gi, 'strong'],
  [
    /Some/g,
    function ($0) {
      return u('link', {url: '//example.com#' + $0}, [u('text', $0)])
    }
  ]
])

console.log(inspect(tree))

Yields:

paragraph[8]
├─0 link[1]
│   │ url: "//example.com#Some"
│   └─0 text "Some"
├─1 text " "
├─2 emphasis[1]
│   └─0 text "em"
├─3 text " "
├─4 text "or"
├─5 text " "
├─6 strong[1]
│   └─0 text "strong"
└─7 text "."

API

This package exports the identifier findAndReplace. There is no default export.

findAndReplace(tree, find, replace[, options])

Find patterns in a tree and replace them. The algorithm searches the tree in preorder for complete values in Text nodes. Partial matches are not supported.

Signatures

• findAndReplace(tree, find, replace[, options])
• findAndReplace(tree, search[, options])

Parameters

• tree (Node)
• find (string or RegExp) — value to find and remove (strings are escaped and turned into a global RegExp)
• replace (string or Function) — value to insert. strings are turned into a Text node, Functions are called with the results of calling RegExp.exec as arguments, and they can return a Node, a string (which is wrapped in a Text node), or false to not replace
• search (Array or Object) — perform multiple find-and-replaces. Either an Array of tuples (Arrays) with find (at 0) and replace (at 1), or an Object where each key is find and each value is the corresponding replace
• options.ignore (Test, default: []) — any unist-util-is compatible test.

Returns

The given tree (Node).

Types

This package is fully typed with TypeScript. It exports the types Find, Replace, ReplaceFunction, FindAndReplaceTuple, FindAndReplaceSchema, FindAndReplaceList, RegExpMatchObject, and Options.

Compatibility

Projects maintained by the unified collective are compatible with all maintained versions of Node.js. As of now, that is Node.js 12.20+, 14.14+, and 16.0+. Our projects sometimes work with older versions, but this is not guaranteed.

Security

Use of mdast-util-find-and-replace does not involve hast or user content so there are no openings for cross-site scripting (XSS) attacks.

Related

• hast-util-find-and-replace — find and replace in hast
• hast-util-select — querySelector, querySelectorAll, and matches
• unist-util-select — select unist nodes with CSS-like selectors

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, organisation, or community you agree to abide by its terms.

License

MIT © Titus Wormer