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244 lines
6.4 KiB
Markdown
244 lines
6.4 KiB
Markdown
# unist-util-position
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[![Build][build-badge]][build]
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[![Coverage][coverage-badge]][coverage]
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[![Downloads][downloads-badge]][downloads]
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[![Size][size-badge]][size]
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[![Sponsors][sponsors-badge]][collective]
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[![Backers][backers-badge]][collective]
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[![Chat][chat-badge]][chat]
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[unist][] utility to get positional info of nodes.
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## Contents
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* [What is this?](#what-is-this)
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* [When should I use this?](#when-should-i-use-this)
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* [Install](#install)
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* [Use](#use)
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* [API](#api)
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* [`position(node)`](#positionnode)
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* [`pointEnd(node)`](#pointendnode)
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* [`pointStart(node)`](#pointstartnode)
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* [Types](#types)
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* [Compatibility](#compatibility)
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* [Related](#related)
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* [Contribute](#contribute)
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* [License](#license)
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## What is this?
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This utility helps with accessing positional info on a potentially dirty tree.
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## When should I use this?
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The positional info is typically consistent and proper in unist trees generated
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by our ecosystem, but, user plugins could mess that up.
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If you’re making a reusable plugin, and accessing the positional info often, you
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might want to guard against that by using this utility.
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You might also find the utility [`unist-util-generated`][unist-util-generated]
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useful to check whether a node is considered to be generated (not in the
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original input file).
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You might also enjoy
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[`unist-util-stringify-position`][unist-util-stringify-position] when you want
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to display positional info to users.
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## Install
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This package is [ESM only][esm].
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In Node.js (version 16+), install with [npm][]:
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```sh
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npm install unist-util-position
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```
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In Deno with [`esm.sh`][esmsh]:
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```js
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import {pointEnd, pointStart, position} from 'https://esm.sh/unist-util-position@5'
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```
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In browsers with [`esm.sh`][esmsh]:
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```html
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<script type="module">
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import {pointEnd, pointStart, position} from 'https://esm.sh/unist-util-position@5?bundle'
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</script>
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```
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## Use
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```js
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import {fromMarkdown} from 'mdast-util-from-markdown'
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import {pointEnd, pointStart, position} from 'unist-util-position'
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const tree = fromMarkdown('# foo\n\n* bar\n')
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console.log(position(tree))
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console.log(pointStart(tree))
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console.log(pointEnd(tree))
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```
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Yields:
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```js
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{start: {line: 1, column: 1, offset: 0}, end: {line: 4, column: 1, offset: 13}}
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{line: 1, column: 1, offset: 0}
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{line: 4, column: 1, offset: 13}
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```
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## API
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This package exports the identifiers [`pointEnd`][pointend],
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[`pointStart`][pointstart], and [`position`][position].
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There is no default export.
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### `position(node)`
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Get the positional info of `node`.
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###### Parameters
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* `node` ([`Node`][node])
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— node
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###### Returns
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Position, if valid ([`Position`][unist-position] or `undefined`).
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### `pointEnd(node)`
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Get the ending point of `node`.
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###### Parameters
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* `node` ([`Node`][node])
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— node
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###### Returns
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Point, if valid ([`Point`][unist-point] or `undefined`).
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### `pointStart(node)`
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Get the starting point of `node`.
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###### Parameters
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* `node` ([`Node`][node])
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— node
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###### Returns
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Point, if valid ([`Point`][unist-point] or `undefined`).
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## Types
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This package is fully typed with [TypeScript][].
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It exports no additional types.
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## Compatibility
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Projects maintained by the unified collective are compatible with maintained
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versions of Node.js.
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When we cut a new major release, we drop support for unmaintained versions of
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Node.
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This means we try to keep the current release line, `unist-util-position@^5`,
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compatible with Node.js 16.
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## Related
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* [`unist-util-stringify-position`](https://github.com/syntax-tree/unist-util-stringify-position)
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— serialize a node, position, or point as a human readable location
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* [`unist-util-position-from-estree`](https://github.com/syntax-tree/unist-util-position-from-estree)
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— get a position from an estree node
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* [`unist-util-remove-position`](https://github.com/syntax-tree/unist-util-remove-position)
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— remove positions from tree
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* [`unist-util-generated`](https://github.com/syntax-tree/unist-util-generated)
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— check if a node is generated
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* [`unist-util-source`](https://github.com/syntax-tree/unist-util-source)
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— get the source of a node
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## Contribute
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See [`contributing.md`][contributing] in [`syntax-tree/.github`][health] for
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ways to get started.
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See [`support.md`][support] for ways to get help.
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This project has a [code of conduct][coc].
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By interacting with this repository, organization, or community you agree to
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abide by its terms.
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## License
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[MIT][license] © [Titus Wormer][author]
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<!-- Definitions -->
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[build-badge]: https://github.com/syntax-tree/unist-util-position/workflows/main/badge.svg
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[build]: https://github.com/syntax-tree/unist-util-position/actions
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[coverage-badge]: https://img.shields.io/codecov/c/github/syntax-tree/unist-util-position.svg
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[coverage]: https://codecov.io/github/syntax-tree/unist-util-position
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[downloads-badge]: https://img.shields.io/npm/dm/unist-util-position.svg
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[downloads]: https://www.npmjs.com/package/unist-util-position
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[size-badge]: https://img.shields.io/badge/dynamic/json?label=minzipped%20size&query=$.size.compressedSize&url=https://deno.bundlejs.com/?q=unist-util-position
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[size]: https://bundlejs.com/?q=unist-util-position
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[sponsors-badge]: https://opencollective.com/unified/sponsors/badge.svg
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[backers-badge]: https://opencollective.com/unified/backers/badge.svg
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[collective]: https://opencollective.com/unified
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[chat-badge]: https://img.shields.io/badge/chat-discussions-success.svg
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[chat]: https://github.com/syntax-tree/unist/discussions
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[npm]: https://docs.npmjs.com/cli/install
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[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
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[esmsh]: https://esm.sh
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[typescript]: https://www.typescriptlang.org
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[license]: license
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[author]: https://wooorm.com
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[health]: https://github.com/syntax-tree/.github
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[contributing]: https://github.com/syntax-tree/.github/blob/main/contributing.md
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[support]: https://github.com/syntax-tree/.github/blob/main/support.md
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[coc]: https://github.com/syntax-tree/.github/blob/main/code-of-conduct.md
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[unist]: https://github.com/syntax-tree/unist
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[node]: https://github.com/syntax-tree/unist#node
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[unist-position]: https://github.com/syntax-tree/unist#position
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[unist-point]: https://github.com/syntax-tree/unist#point
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[unist-util-generated]: https://github.com/syntax-tree/unist-util-generated
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[unist-util-stringify-position]: https://github.com/syntax-tree/unist-util-stringify-position
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[position]: #positionnode
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[pointend]: #pointendnode
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[pointstart]: #pointstartnode
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