# micromark-factory-whitespace

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[micromark][] factory to parse [markdown line endings or spaces][ws] (found in
lots of places).

## Contents

* [What is this?](#what-is-this)
* [When should I use this?](#when-should-i-use-this)
* [Install](#install)
* [Use](#use)
* [API](#api)
  * [`factoryWhitespace(…)`](#factorywhitespace)
* [Types](#types)
* [Compatibility](#compatibility)
* [Security](#security)
* [Contribute](#contribute)
* [License](#license)

## What is this?

This package exposes states to parse whitespace.

## When should I use this?

This package is useful when you are making your own micromark extensions.

## Install

This package is [ESM only][esm].
In Node.js (version 16+), install with [npm][]:

```sh
npm install micromark-factory-whitespace
```

In Deno with [`esm.sh`][esmsh]:

```js
import {factoryWhitespace} from 'https://esm.sh/micromark-factory-whitespace@1'
```

In browsers with [`esm.sh`][esmsh]:

```html
<script type="module">
  import {factoryWhitespace} from 'https://esm.sh/micromark-factory-whitespace@1?bundle'
</script>
```

## Use

```js
import {factoryWhitespace} from 'micromark-factory-whitespace'
import {codes, types} from 'micromark-util-symbol'

// A micromark tokenizer that uses the factory:
/**
 * @this {TokenizeContext}
 *   Context.
 * @type {Tokenizer}
 */
function tokenizeTitle(effects, ok, nok) {
  return start

  /** @type {State} */
  function start(code) {
    return markdownLineEndingOrSpace(code)
      ? factoryWhitespace(effects, before)(code)
      : nok(code)
  }

  // …
}
```

## API

This module exports the identifier
[`factoryWhitespace`][api-factory-whitespace].
There is no default export.

### `factoryWhitespace(…)`

Parse spaces and tabs.

There is no `nok` parameter:

* line endings or spaces in markdown are often optional, in which case this
  factory can be used and `ok` will be switched to whether spaces were found
  or not
* one line ending or space can be detected with
  [`markdownLineEndingOrSpace(code)`][ws] right before using
  `factoryWhitespace`

###### Parameters

* `effects` (`Effects`)
  — context
* `ok` (`State`)
  — state switched to when successful

###### Returns

Start state (`State`).

## Types

This package is fully typed with [TypeScript][].
It exports no additional types.

## 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,
`micromark-factory-whitespace@2`, compatible with Node.js 16.
This package works with `micromark@3`.

## Security

This package is safe.
See [`security.md`][securitymd] in [`micromark/.github`][health] for how to
submit a security report.

## Contribute

See [`contributing.md`][contributing] in [`micromark/.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, organisation, or community you agree to
abide by its terms.

## License

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

<!-- Definitions -->

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

[build]: https://github.com/micromark/micromark/actions

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

[coverage]: https://codecov.io/github/micromark/micromark

[downloads-badge]: https://img.shields.io/npm/dm/micromark-factory-whitespace.svg

[downloads]: https://www.npmjs.com/package/micromark-factory-whitespace

[bundle-size-badge]: https://img.shields.io/badge/dynamic/json?label=minzipped%20size&query=$.size.compressedSize&url=https://deno.bundlejs.com/?q=micromark-factory-whitespace

[bundle-size]: https://bundlejs.com/?q=micromark-factory-whitespace

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

[npm]: https://docs.npmjs.com/cli/install

[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c

[esmsh]: https://esm.sh

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

[chat]: https://github.com/micromark/micromark/discussions

[license]: https://github.com/micromark/micromark/blob/main/license

[author]: https://wooorm.com

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

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

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

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

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

[ws]: https://github.com/micromark/micromark/tree/main/packages/micromark-util-character#markdownlineendingorspacecode

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

[micromark]: https://github.com/micromark/micromark

[api-factory-whitespace]: #factorywhitespace
