unist-util-position

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[unist][] utility to get positional info of nodes.

Contents

* What is this?
* When should I use this?
* Install
* Use
* API
* position(node)
* pointEnd(node)
* pointStart(node)
* Types
* Compatibility
* Related
* Contribute
* License

What is this?

This utility helps with accessing positional info on a potentially dirty tree.

When should I use this?

The positional info is typically consistent and proper in unist trees generated
by our ecosystem, but, user plugins could mess that up.
If you’re making a reusable plugin, and accessing the positional info often, you
might want to guard against that by using this utility.

You might also find the utility [unist-util-generated][unist-util-generated]
useful to check whether a node is considered to be generated (not in the
original input file).

You might also enjoy
[unist-util-stringify-position][unist-util-stringify-position] when you want
to display positional info to users.

Install

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

``sh
npm install unist-util-position
`

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

`js
import {pointEnd, pointStart, position} from 'https://esm.sh/unist-util-position@5'
`

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

`html

`

Use

`js
import {fromMarkdown} from 'mdast-util-from-markdown'
import {pointEnd, pointStart, position} from 'unist-util-position'

const tree = fromMarkdown('# foo\n\n* bar\n')

console.log(position(tree))
console.log(pointStart(tree))
console.log(pointEnd(tree))
`

Yields:

`js
{start: {line: 1, column: 1, offset: 0}, end: {line: 4, column: 1, offset: 13}}
{line: 1, column: 1, offset: 0}
{line: 4, column: 1, offset: 13}
`

API

This package exports the identifiers [pointEnd][pointend],
[pointStart][pointstart], and [position][position].
There is no default export.

$3

Get the positional info of node.

###### Parameters

* node ([Node][node])
— node

###### Returns

Position, if valid ([Position][unist-position] or undefined).

$3

Get the ending point of node.

###### Parameters

* node ([Node][node])
— node

###### Returns

Point, if valid ([Point][unist-point] or undefined).

$3

Get the starting point of node.

###### Parameters

* node ([Node][node])
— node

###### Returns

Point, if valid ([Point][unist-point] or undefined).

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, unist-util-position@^5,
compatible with Node.js 16.

Related

* unist-util-stringify-position
— serialize a node, position, or point as a human readable location
* unist-util-position-from-estree
— get a position from an estree node
* unist-util-remove-position
— remove positions from tree
* unist-util-generated
— check if a node is generated
* unist-util-source
— get the source of a node

Contribute

See [contributing.md][contributing] in [syntax-tree/.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, organization, or community you agree to
abide by its terms.

License

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

[build-badge]: https://github.com/syntax-tree/unist-util-position/workflows/main/badge.svg

[build]: https://github.com/syntax-tree/unist-util-position/actions

[coverage-badge]: https://img.shields.io/codecov/c/github/syntax-tree/unist-util-position.svg

[coverage]: https://codecov.io/github/syntax-tree/unist-util-position

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[downloads]: https://www.npmjs.com/package/unist-util-position

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[sponsors-badge]: https://opencollective.com/unified/sponsors/badge.svg

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

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[chat]: https://github.com/syntax-tree/unist/discussions

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

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

[esmsh]: https://esm.sh

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

[license]: license

[author]: https://wooorm.com

[health]: https://github.com/syntax-tree/.github

[contributing]: https://github.com/syntax-tree/.github/blob/main/contributing.md

[support]: https://github.com/syntax-tree/.github/blob/main/support.md

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

[unist]: https://github.com/syntax-tree/unist

[node]: https://github.com/syntax-tree/unist#node

[unist-position]: https://github.com/syntax-tree/unist#position

[unist-point]: https://github.com/syntax-tree/unist#point

[unist-util-generated]: https://github.com/syntax-tree/unist-util-generated

[unist-util-stringify-position]: https://github.com/syntax-tree/unist-util-stringify-position

[position]: #positionnode

[pointend]: #pointendnode

[pointstart]: #pointstartnode