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/**
* Turn the number (in string form as either hexa- or plain decimal) coming from
* a numeric character reference into a character.
*
* Sort of like `String.fromCharCode(Number.parseInt(value, base))`, but makes
* non-characters and control characters safe.
*
* @param {string} value
* Value to decode.
* @param {number} base
* Numeric base.
* @returns {string}
* Character.
*/
export function decodeNumericCharacterReference(
value: string,
base: number
): string

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import {codes} from 'micromark-util-symbol/codes.js'
import {values} from 'micromark-util-symbol/values.js'
/**
* Turn the number (in string form as either hexa- or plain decimal) coming from
* a numeric character reference into a character.
*
* Sort of like `String.fromCharCode(Number.parseInt(value, base))`, but makes
* non-characters and control characters safe.
*
* @param {string} value
* Value to decode.
* @param {number} base
* Numeric base.
* @returns {string}
* Character.
*/
export function decodeNumericCharacterReference(value, base) {
const code = Number.parseInt(value, base)
if (
// C0 except for HT, LF, FF, CR, space.
code < codes.ht ||
code === codes.vt ||
(code > codes.cr && code < codes.space) ||
// Control character (DEL) of C0, and C1 controls.
(code > codes.tilde && code < 160) ||
// Lone high surrogates and low surrogates.
(code > 55295 && code < 57344) ||
// Noncharacters.
(code > 64975 && code < 65008) ||
/* eslint-disable no-bitwise */
(code & 65535) === 65535 ||
(code & 65535) === 65534 ||
/* eslint-enable no-bitwise */
// Out of range
code > 1114111
) {
return values.replacementCharacter
}
return String.fromCharCode(code)
}

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/**
* Turn the number (in string form as either hexa- or plain decimal) coming from
* a numeric character reference into a character.
*
* Sort of like `String.fromCharCode(Number.parseInt(value, base))`, but makes
* non-characters and control characters safe.
*
* @param {string} value
* Value to decode.
* @param {number} base
* Numeric base.
* @returns {string}
* Character.
*/
export function decodeNumericCharacterReference(
value: string,
base: number
): string

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/**
* Turn the number (in string form as either hexa- or plain decimal) coming from
* a numeric character reference into a character.
*
* Sort of like `String.fromCharCode(Number.parseInt(value, base))`, but makes
* non-characters and control characters safe.
*
* @param {string} value
* Value to decode.
* @param {number} base
* Numeric base.
* @returns {string}
* Character.
*/
export function decodeNumericCharacterReference(value, base) {
const code = Number.parseInt(value, base)
if (
// C0 except for HT, LF, FF, CR, space.
code < 9 ||
code === 11 ||
(code > 13 && code < 32) ||
// Control character (DEL) of C0, and C1 controls.
(code > 126 && code < 160) ||
// Lone high surrogates and low surrogates.
(code > 55295 && code < 57344) ||
// Noncharacters.
(code > 64975 && code < 65008) /* eslint-disable no-bitwise */ ||
(code & 65535) === 65535 ||
(code & 65535) === 65534 /* eslint-enable no-bitwise */ ||
// Out of range
code > 1114111
) {
return '\uFFFD'
}
return String.fromCharCode(code)
}

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{
"name": "micromark-util-decode-numeric-character-reference",
"version": "1.1.0",
"description": "micromark utility to decode numeric character references",
"license": "MIT",
"keywords": [
"micromark",
"util",
"utility",
"decode",
"numeric",
"number",
"character",
"reference"
],
"repository": "https://github.com/micromark/micromark/tree/main/packages/micromark-util-decode-numeric-character-reference",
"bugs": "https://github.com/micromark/micromark/issues",
"funding": [
{
"type": "GitHub Sponsors",
"url": "https://github.com/sponsors/unifiedjs"
},
{
"type": "OpenCollective",
"url": "https://opencollective.com/unified"
}
],
"author": "Titus Wormer <tituswormer@gmail.com> (https://wooorm.com)",
"contributors": [
"Titus Wormer <tituswormer@gmail.com> (https://wooorm.com)"
],
"sideEffects": false,
"type": "module",
"main": "index.js",
"types": "dev/index.d.ts",
"files": [
"dev/",
"index.d.ts",
"index.js"
],
"exports": {
"types": "./dev/index.d.ts",
"development": "./dev/index.js",
"default": "./index.js"
},
"dependencies": {
"micromark-util-symbol": "^1.0.0"
},
"scripts": {
"build": "micromark-build"
},
"xo": false,
"typeCoverage": {
"atLeast": 100,
"detail": true,
"strict": true,
"ignoreCatch": true
}
}

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# micromark-util-decode-numeric-character-reference
[![Build][build-badge]][build]
[![Coverage][coverage-badge]][coverage]
[![Downloads][downloads-badge]][downloads]
[![Size][bundle-size-badge]][bundle-size]
[![Sponsors][sponsors-badge]][opencollective]
[![Backers][backers-badge]][opencollective]
[![Chat][chat-badge]][chat]
[micromark][] utility to decode numeric character references.
## Contents
* [What is this?](#what-is-this)
* [When should I use this?](#when-should-i-use-this)
* [Install](#install)
* [Use](#use)
* [API](#api)
* [`decodeNumericCharacterReference(value, base)`](#decodenumericcharacterreferencevalue-base)
* [Types](#types)
* [Compatibility](#compatibility)
* [Security](#security)
* [Contribute](#contribute)
* [License](#license)
## What is this?
This package exposes an algorithm to decode numeric character references.
## When should I use this?
This package might be 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-util-decode-numeric-character-reference
```
In Deno with [`esm.sh`][esmsh]:
```js
import {decodeNumericCharacterReference} from 'https://esm.sh/micromark-util-decode-numeric-character-reference@1'
```
In browsers with [`esm.sh`][esmsh]:
```html
<script type="module">
import {decodeNumericCharacterReference} from 'https://esm.sh/micromark-util-decode-numeric-character-reference@1?bundle'
</script>
```
## Use
```js
import {decodeNumericCharacterReference} from 'micromark-util-decode-numeric-character-reference'
decodeNumericCharacterReference('41', 16) // 'A'
decodeNumericCharacterReference('65', 10) // 'A'
decodeNumericCharacterReference('A', 16) // '\n'
decodeNumericCharacterReference('7F', 16) // '<27>' - Control
decodeNumericCharacterReference('110000', 16) // '<27>' - Out of range
```
## API
This module exports the identifier:
[`decodeNumericCharacterReference`][api-decode-numeric-character-reference].
There is no default export.
### `decodeNumericCharacterReference(value, base)`
Turn the number (in string form as either hexa- or plain decimal) coming from
a numeric character reference into a character.
Sort of like `String.fromCharCode(Number.parseInt(value, base))`, but makes
non-characters and control characters safe.
###### Parameters
* `value` (`string`)
— value to decode
* `base` (`number`, probably `10` or `16`)
— numeric base
###### Returns
Character (`string`).
## Types
This package is fully typed with [TypeScript][].
It exports no additional types.
## Compatibility
Projects maintained by the unified collective are compatible with all maintained
versions of Node.js.
As of now, that is Node.js 16+.
Our projects sometimes work with older versions, but this is not guaranteed.
This package works with `micromark` version 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-util-normalize-identifier.svg
[downloads]: https://www.npmjs.com/package/micromark-util-normalize-identifier
[bundle-size-badge]: https://img.shields.io/badge/dynamic/json?label=minzipped%20size&query=$.size.compressedSize&url=https://deno.bundlejs.com/?q=micromark-util-normalize-identifier
[bundle-size]: https://bundlejs.com/?q=micromark-util-normalize-identifier
[sponsors-badge]: https://opencollective.com/unified/sponsors/badge.svg
[backers-badge]: https://opencollective.com/unified/backers/badge.svg
[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
[typescript]: https://www.typescriptlang.org
[micromark]: https://github.com/micromark/micromark
[api-decode-numeric-character-reference]: #decodenumericcharacterreferencevalue-base