186 lines
4.6 KiB
Markdown
186 lines
4.6 KiB
Markdown
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# vfile-location
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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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[vfile][] utility to convert between positional (line and column-based) and
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offsets (range-based) locations.
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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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* [`location(file)`](#locationfile)
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* [`Location`](#location)
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* [Types](#types)
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* [Compatibility](#compatibility)
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* [Contribute](#contribute)
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* [License](#license)
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## What is this?
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This is a tiny but useful package to convert between arbitrary places in a
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file.
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## When should I use this?
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This utility is useful when ASTs nodes don’t cut it.
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For example, when you are making a lint rule that looks for dangerous
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characters in a file, which you accomplish by searching the raw file value,
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and still want to report it 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 14.14+ and 16.0+), install with [npm][]:
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```sh
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npm install vfile-location
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```
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In Deno with [`esm.sh`][esmsh]:
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```js
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import {location} from 'https://esm.sh/vfile-location@4'
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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 {location} from 'https://esm.sh/vfile-location@4?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 {VFile} from 'vfile'
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import {location} from 'vfile-location'
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const place = location(new VFile('foo\nbar\nbaz'))
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const offset = place.toOffset({line: 3, column: 3}) // => 10
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place.toPoint(offset) // => {line: 3, column: 3, offset: 10}
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```
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## API
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This package exports the identifier [`location`][api-location].
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There is no default export.
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### `location(file)`
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Index the given document so you can translate between line/column and offset
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based positional info.
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###### Parameters
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* `file` (`string`, `Buffer`, or [`VFile`][vfile])
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— file to index
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###### Returns
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Accessors for index ([`Location`][api-location-map]).
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### `Location`
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Accessors for index (TypeScript type).
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###### Fields
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* `toPoint` (`(offset?: number) => Point`)
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— get a line/column-based [`Point`][point] from `offset`
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* `toOffset` (`(point?: Point) => number`)
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— get an offset from a line/column-based [`point`][point]
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## Types
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This package is fully typed with [TypeScript][].
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It exports the additional type [`Location`][api-location-map].
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## Compatibility
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Projects maintained by the unified collective are compatible with all maintained
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versions of Node.js.
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As of now, that is Node.js 14.14+ and 16.0+.
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Our projects sometimes work with older versions, but this is not guaranteed.
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## Contribute
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See [`contributing.md`][contributing] in [`vfile/.github`][health] for ways to
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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/vfile/vfile-location/workflows/main/badge.svg
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[build]: https://github.com/vfile/vfile-location/actions
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[coverage-badge]: https://img.shields.io/codecov/c/github/vfile/vfile-location.svg
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[coverage]: https://codecov.io/github/vfile/vfile-location
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[downloads-badge]: https://img.shields.io/npm/dm/vfile-location.svg
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[downloads]: https://www.npmjs.com/package/vfile-location
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[size-badge]: https://img.shields.io/bundlephobia/minzip/vfile-location.svg
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[size]: https://bundlephobia.com/result?p=vfile-location
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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/vfile/vfile/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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[contributing]: https://github.com/vfile/.github/blob/main/contributing.md
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[support]: https://github.com/vfile/.github/blob/main/support.md
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[health]: https://github.com/vfile/.github
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[coc]: https://github.com/vfile/.github/blob/main/code-of-conduct.md
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[license]: license
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[author]: https://wooorm.com
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[vfile]: https://github.com/vfile/vfile
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[point]: https://github.com/syntax-tree/unist#point
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[api-location]: #locationfile
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[api-location-map]: #location
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