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https://github.com/retextjs/retext

natural language processor powered by plugins part of the @unifiedjs collective
https://github.com/retextjs/retext

ast cst javascript natural-language retext unified

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natural language processor powered by plugins part of the @unifiedjs collective

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README 

        
# [![retext][logo]][unified]



[![Build][build-badge]][build]

[![Coverage][coverage-badge]][coverage]

[![Downloads][downloads-badge]][downloads]

[![Size][size-badge]][size]

[![Sponsors][sponsors-badge]][collective]

[![Backers][backers-badge]][collective]

[![Chat][chat-badge]][chat]



**retext** is a tool that transforms natural language with plugins.

These plugins can inspect and change the natural language.

You can use retext on the server, the client, deno, etc.



## Intro



retext is an ecosystem of plugins that work with natural language as structured

data, specifically CSTs (concrete syntax trees).

Syntax trees make it easy for programs to deal with prose.

We call those programs plugins.

Plugins inspect and change trees.

You can use the many existing plugins or you can make your own.

Some example use cases are to [check spelling][retext-spell],

[fix typography][retext-smartypants], or

[make sure text is readable][retext-readability].



* for more about us, see [`unifiedjs.com`][site]

* for updates, see [Twitter][]

* for questions, see [support][]

* to help, see [contribute][] or [sponsor][] below



## Contents



* [What is this?](#what-is-this)

* [When should I use this?](#when-should-i-use-this)

* [Plugins](#plugins)

* [Types](#types)

* [Compatibility](#compatibility)

* [Contribute](#contribute)

* [Sponsor](#sponsor)

* [License](#license)



## What is this?



With this project and a plugin, you can turn simple punctuation:



```text

He said, "A 'simple' english sentence. . .

```



…into smart punctuation:



```text

He said, “A ‘simple’ english sentence…”

```



Show example code



```js

import retextLatin from 'retext-latin'

import retextSmartyPants from 'retext-smartypants'

import retextStringify from 'retext-stringify'

import {unified} from 'unified'



const file = await unified()

  .use(retextLatin)

  .use(retextSmartyPants)

  .use(retextStringify)

  .process("He said, \"A 'simple' english sentence. . .")



console.log(String(file))

```



With another plugin, you can check natural language:



**In**:



```text

Where can I find an ATM machine?

```



**Out**:



```text

1:21-1:32 warning Unexpected redundant `ATM machine`, expected `ATM` atm retext-redundant-acronyms



⚠ 1 warning

```



Show example code



```js

import retextEnglish from 'retext-english'

import retextRedundantAcronyms from 'retext-redundant-acronyms'

import retextStringify from 'retext-stringify'

import {unified} from 'unified'

import {reporter} from 'vfile-reporter'



const file = await unified()

  .use(retextEnglish)

  .use(retextRedundantAcronyms)

  .use(retextStringify)

  .process('Where can I find an ATM machine?')



console.log(reporter(file))

```



…and you can make your own plugins.



You can use retext for many different things.

**[unified][]** is the core project that transforms content with ASTs.

**retext** adds support for natural language to unified.

**[nlcst][]** is the natural language AST that retext uses.



This GitHub repository is a monorepo that contains the following packages:



* [`retext-dutch`][retext-dutch]

  — parse Dutch prose to a syntax tree

* [`retext-english`][retext-english]

  — parse English prose to a syntax tree

* [`retext-latin`][retext-latin]

  — parse any Latin-script prose to a syntax tree

* [`retext-stringify`][retext-stringify]

  — serialize a syntax tree

* [`retext`][api]

  — programmatic interface with both `retext-latin` and `retext-stringify`



## When should I use this?



It is recommended to use `unified` with `retext-english` (or `retext-dutch`)

and `retext-stringify` if your content is in English (or Dutch).

Otherwise, if your content is in another Latin-script language, use `retext`.



## Plugins



retext plugins deal with natural language.

You can choose from the many plugins that already exist.

Here are three good ways to find plugins:



* [`awesome-retext`][awesome-retext]

  — selection of the most awesome projects

* [List of plugins][list-of-plugins]

  — list of all plugins

* [`retext-plugin` topic][topic]

  — any tagged repo on GitHub



Some plugins are maintained by us here in the `@retextjs` organization while

others are maintained by folks elsewhere.

Anyone can make retext plugins, so as always when choosing whether to include

dependencies in your project, make sure to carefully assess the quality of

retext plugins too.



## Types



The retext organization and the unified collective as a whole is fully typed

with [TypeScript][].

Types for nlcst are available in [`@types/nlcst`][types-nlcst].



For TypeScript to work, it is important to type your plugins.

For example:



```js

/**

 * @import {Root} from 'nlcst'

 */



/**

 * @typedef Options

 *   Configuration (optional).

 * @property {boolean | null | undefined} [someField]

 *   Some option.

 */



/**

 * My plugin.

 *

 * @param {Options | null | undefined} [options]

 *   Configuration (optional).

 * @returns

 *   Transform.

 */

export function myRetextPluginAcceptingOptions(options) {

  /**

   * @param {Root} tree

   *   Tree.

   * @param {VFile} file

   *   File.

   * @returns {undefined}

   *   Nothing.

   */

  return function (tree, file) {

    // Do things.

  }

}

```



## Compatibility



Projects maintained by the unified collective are compatible with maintained

versions of Node.js.



When we cut a new major release, we drop support for unmaintained versions of

Node.

This means we try to keep the current release line compatible with Node.js 16.



## Contribute



See [`contributing.md`][contributing] in [`retextjs/.github`][health] for ways

to get started.

See [`support.md`][support] for ways to get help.



This project has a [code of conduct][coc].

By interacting with this repository, organization, or community you agree to

abide by its terms.



For info on how to submit a security report, see our

[security policy][security].



## Sponsor



Support this effort and give back by sponsoring on [OpenCollective][collective]!



  Vercel



  



  Motif



  



  HashiCorp



  



  GitBook



  



  Gatsby



  



  Netlify



  

  



  Coinbase



  



  ThemeIsle



  



  Expo



  



  Boost Note



  



  Markdown Space



  



  Holloway



  



  


  You?

  




## License



[MIT][license] © [Titus Wormer][author]



[logo]: https://raw.githubusercontent.com/retextjs/retext/3420f05/logo.svg?sanitize=true



[build-badge]: https://github.com/retextjs/retext/workflows/main/badge.svg



[build]: https://github.com/retextjs/retext/actions



[coverage-badge]: https://img.shields.io/codecov/c/github/retextjs/retext.svg



[coverage]: https://codecov.io/github/retextjs/retext



[downloads-badge]: https://img.shields.io/npm/dm/retext.svg



[downloads]: https://www.npmjs.com/package/retext



[size-badge]: https://img.shields.io/bundlejs/size/retext



[size]: https://bundlejs.com/?q=retext



[sponsors-badge]: https://opencollective.com/unified/sponsors/badge.svg



[backers-badge]: https://opencollective.com/unified/backers/badge.svg



[collective]: https://opencollective.com/unified



[chat]: https://github.com/retextjs/retext/discussions



[chat-badge]: https://img.shields.io/badge/chat-discussions-success.svg



[health]: https://github.com/retextjs/.github



[security]: https://github.com/retextjs/.github/blob/main/security.md



[contributing]: https://github.com/retextjs/.github/blob/main/contributing.md



[support]: https://github.com/retextjs/.github/blob/main/support.md



[coc]: https://github.com/retextjs/.github/blob/main/code-of-conduct.md



[license]: license



[author]: https://wooorm.com



[unified]: https://github.com/unifiedjs/unified



[types-nlcst]: https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/nlcst



[typescript]: https://www.typescriptlang.org



[twitter]: https://twitter.com/unifiedjs



[site]: https://unifiedjs.com



[topic]: https://github.com/topics/retext-plugin



[nlcst]: https://github.com/syntax-tree/nlcst



[awesome-retext]: https://github.com/retextjs/awesome-retext



[retext-english]: https://github.com/retextjs/retext/tree/main/packages/retext-english



[retext-dutch]: https://github.com/retextjs/retext/tree/main/packages/retext-dutch



[retext-latin]: https://github.com/retextjs/retext/tree/main/packages/retext-latin



[retext-stringify]: https://github.com/retextjs/retext/tree/main/packages/retext-stringify



[api]: https://github.com/retextjs/retext/tree/main/packages/retext



[list-of-plugins]: https://github.com/retextjs/retext/tree/main/doc/plugins.md



[retext-readability]: https://github.com/retextjs/retext-readability



[retext-smartypants]: https://github.com/retextjs/retext-smartypants



[retext-spell]: https://github.com/retextjs/retext-spell



[contribute]: #contribute



[sponsor]: #sponsor