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+# vfile-location
+
+[![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]
+
+Convert between positions (line and column-based) and offsets (range-based)
+locations in a [virtual file][vfile].
+
+## Install
+
+[npm][]:
+
+```sh
+npm install vfile-location
+```
+
+## Usage
+
+```js
+var vfile = require('vfile')
+var vfileLocation = require('vfile-location')
+
+var location = vfileLocation(vfile('foo\nbar\nbaz'))
+
+var offset = location.toOffset({line: 3, column: 3}) // => 10
+location.toPosition(offset) // => {line: 3, column: 3, offset: 10}
+```
+
+## API
+
+### `location = vfileLocation(doc)`
+
+Get transform functions for the given `doc` (`string`) or [`file`][vfile].
+
+Returns an object with [`toOffset`][to-offset] and [`toPosition`][to-position].
+
+### `location.toOffset(position)`
+
+Get the `offset` (`number`) for a line and column-based [`position`][position]
+in the bound file.
+Returns `-1` when given invalid or out of bounds input.
+
+### `location.toPosition(offset)`
+
+Get the line and column-based [`position`][position] for `offset` in the bound
+file.
+
+## Contribute
+
+See [`contributing.md`][contributing] in [`vfile/.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://img.shields.io/travis/vfile/vfile-location.svg
+
+[build]: https://travis-ci.org/vfile/vfile-location
+
+[coverage-badge]: https://img.shields.io/codecov/c/github/vfile/vfile-location.svg
+
+[coverage]: https://codecov.io/github/vfile/vfile-location
+
+[downloads-badge]: https://img.shields.io/npm/dm/vfile-location.svg
+
+[downloads]: https://www.npmjs.com/package/vfile-location
+
+[size-badge]: https://img.shields.io/bundlephobia/minzip/vfile-location.svg
+
+[size]: https://bundlephobia.com/result?p=vfile-location
+
+[sponsors-badge]: https://opencollective.com/unified/sponsors/badge.svg
+
+[backers-badge]: https://opencollective.com/unified/backers/badge.svg
+
+[collective]: https://opencollective.com/unified
+
+[chat-badge]: https://img.shields.io/badge/join%20the%20community-on%20spectrum-7b16ff.svg
+
+[chat]: https://spectrum.chat/unified/vfile
+
+[npm]: https://docs.npmjs.com/cli/install
+
+[contributing]: https://github.com/vfile/.github/blob/master/contributing.md
+
+[support]: https://github.com/vfile/.github/blob/master/support.md
+
+[health]: https://github.com/vfile/.github
+
+[coc]: https://github.com/vfile/.github/blob/master/code-of-conduct.md
+
+[license]: license
+
+[author]: https://wooorm.com
+
+[vfile]: https://github.com/vfile/vfile
+
+[to-offset]: #locationtooffsetposition
+
+[to-position]: #locationtopositionoffset
+
+[position]: https://github.com/syntax-tree/unist#position