unist-util-modify-children

Modify direct children of a parent.

Install

This package is ESM only: Node 12+ is needed to use it and it must be imported instead of required.

npm:

npm install unist-util-modify-children

Use

import u from 'unist-builder'
import {modifyChildren} from 'unist-util-modify-children'

var modify = modifyChildren(modifier)

var tree = u('root', [
  u('leaf', '1'),
  u('node', [u('leaf', '2')]),
  u('leaf', '3')
])

modify(tree)

console.dir(tree, {depth: null})

function modifier(node, index, parent) {
  if (node.type === 'node') {
    parent.children.splice(index, 1, {type: 'subtree', children: node.children})
    return index + 1
  }
}

Yields:

{
  type: 'root',
  children: [
    {type: 'leaf', value: '1'},
    {type: 'subtree', children: [{type: 'leaf', value: '2'}]},
    {type: 'leaf', value: '3'}
  ]
}

API

This package exports the following identifiers: modifyChildren. There is no default export.

modify = modifyChildren(modifier)

Wrap modifier to be invoked for each child in the node given to modify.

next? = modifier(child, index, parent)

Invoked if modify is called on a parent node for each child in parent.

Returns

number (optional) — Next position to iterate.

function modify(parent)

Invoke the bound modifier for each child in parent (Node).

Related

• unist-util-visit — Recursively walk over nodes
• unist-util-visit-parents — Like visit, but with a stack of parents
• unist-util-filter — Create a new tree with all nodes that pass a test
• unist-util-map — Create a new tree with all nodes mapped by a given function
• unist-util-flatmap — Create a new tree by mapping (to an array) with the given function
• unist-util-find-after — Find a node after another node
• unist-util-find-before — Find a node before another node
• unist-util-find-all-after — Find all nodes after another node
• unist-util-find-all-before — Find all nodes before another node
• unist-util-find-all-between — Find all nodes between two nodes
• unist-util-remove — Remove nodes from a tree that pass a test
• unist-util-select — Select nodes with CSS-like selectors

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.

License

MIT © Titus Wormer