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unist-util-position
unist utility to get positional info of nodes.
Contents
- What is this?
- When should I use this?
- Install
- Use
- API
- 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
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 when you want
to display positional info to users.
Install
This package is ESM only. In Node.js (version 16+), install with npm:
npm install unist-util-position
In Deno with esm.sh:
import {pointEnd, pointStart, position} from 'https://esm.sh/unist-util-position@5'
In browsers with esm.sh:
<script type="module">
import {pointEnd, pointStart, position} from 'https://esm.sh/unist-util-position@5?bundle'
</script>
Use
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:
{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,
pointStart, and position.
There is no default export.
position(node)
Get the positional info of node.
Parameters
node(Node) — node
Returns
Position, if valid (Position or undefined).
pointEnd(node)
Get the ending point of node.
Parameters
node(Node) — node
Returns
Point, if valid (Point or undefined).
pointStart(node)
Get the starting point of node.
Parameters
node(Node) — node
Returns
Point, if valid (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 locationunist-util-position-from-estree— get a position from an estree nodeunist-util-remove-position— remove positions from treeunist-util-generated— check if a node is generatedunist-util-source— get the source of a node
Contribute
See contributing.md in syntax-tree/.github for
ways to get started.
See support.md for ways to get help.
This project has a code of conduct. By interacting with this repository, organization, or community you agree to abide by its terms.