mdast-util-sub-sup

mdast utilities for subscript and superscript nodes.

Install

npm install mdast-util-sub-sup

Use

import { fromMarkdown } from 'mdast-util-from-markdown'
import { toMarkdown } from 'mdast-util-to-markdown'
import { subSup } from 'micromark-extension-sub-sup'
import { subSupFromMarkdown, subSupToMarkdown } from 'mdast-util-sub-sup'

const tree = fromMarkdown('H_{2}O', {
  extensions: [subSup()],
  mdastExtensions: [subSupFromMarkdown()]
})

const markdown = toMarkdown(tree, {
  extensions: [subSupToMarkdown()]
})

AST

Subscript

interface Subscript extends Node {
  type: 'subscript'
  children: PhrasingContent[]
}

Renders to <sub> in HTML.

Superscript

interface Superscript extends Node {
  type: 'superscript'
  children: PhrasingContent[]
}

Renders to <sup> in HTML.

API

subSupFromMarkdown()

Extension for mdast-util-from-markdown to parse subscript/superscript.

subSupToMarkdown()

Extension for mdast-util-to-markdown to serialize subscript/superscript.

Escaping

When serializing to markdown, balanced braces are preserved:

• _{a{b}c} → _{a{b}c} (balanced, no escaping needed)

Unbalanced braces are escaped:

• Unbalanced } is escaped as \}
• Unbalanced { is escaped as \{
• \ before {, }, or \ is passed through as-is

Related

• micromark-extension-sub-sup — tokenizer
• remark-sub-sup — remark plugin

License

MIT