unist-util-position
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!Chatchat-badgechatunist utility to get positional info of nodes.
Contents
* [`position(node)`](#positionnode)
* [`pointEnd(node)`](#pointendnode)
* [`pointStart(node)`](#pointstartnode)
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 onlyesm. In Node.js (version 16+), install with npm:npm install unist-util-position
In Deno with
esm.sh
esmsh:import {pointEnd, pointStart, position} from 'https://esm.sh/unist-util-position@5'
In browsers with
esm.sh
esmsh:<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 identifierspointEnd
pointend,
pointStart
pointstart, and position
position.
There is no default export.position(node)
Get the positional info of node
.Parameters
— node
Returns
Position, if valid (Position
unist-position or undefined
).pointEnd(node)
Get the ending point of node
.Parameters
— node
Returns
Point, if valid (Point
unist-point or undefined
).pointStart(node)
Get the starting point of node
.Parameters
— 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
— serialize a node, position, or point as a human readable location
— get a position from an estree node
— remove positions from tree
— check if a node is generated
— get the source of a node
Contribute
Seecontributing.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 conductcoc. By interacting with this repository, organization, or community you agree to abide by its terms.