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/**
* @typedef {import('micromark-util-types').Extension} Extension
* @typedef {import('micromark-util-types').Handles} Handles
* @typedef {import('micromark-util-types').HtmlExtension} HtmlExtension
* @typedef {import('micromark-util-types').NormalizedExtension} NormalizedExtension
*/
import {splice} from 'micromark-util-chunked'
const hasOwnProperty = {}.hasOwnProperty
/**
* Combine multiple syntax extensions into one.
*
* @param {Array<Extension>} extensions
* List of syntax extensions.
* @returns {NormalizedExtension}
* A single combined extension.
*/
export function combineExtensions(extensions) {
/** @type {NormalizedExtension} */
const all = {}
let index = -1
while (++index < extensions.length) {
syntaxExtension(all, extensions[index])
}
return all
}
/**
* Merge `extension` into `all`.
*
* @param {NormalizedExtension} all
* Extension to merge into.
* @param {Extension} extension
* Extension to merge.
* @returns {void}
*/
function syntaxExtension(all, extension) {
/** @type {keyof Extension} */
let hook
for (hook in extension) {
const maybe = hasOwnProperty.call(all, hook) ? all[hook] : undefined
/** @type {Record<string, unknown>} */
const left = maybe || (all[hook] = {})
/** @type {Record<string, unknown> | undefined} */
const right = extension[hook]
/** @type {string} */
let code
if (right) {
for (code in right) {
if (!hasOwnProperty.call(left, code)) left[code] = []
const value = right[code]
constructs(
// @ts-expect-error Looks like a list.
left[code],
Array.isArray(value) ? value : value ? [value] : []
)
}
}
}
}
/**
* Merge `list` into `existing` (both lists of constructs).
* Mutates `existing`.
*
* @param {Array<unknown>} existing
* @param {Array<unknown>} list
* @returns {void}
*/
function constructs(existing, list) {
let index = -1
/** @type {Array<unknown>} */
const before = []
while (++index < list.length) {
// @ts-expect-error Looks like an object.
;(list[index].add === 'after' ? existing : before).push(list[index])
}
splice(existing, 0, 0, before)
}
/**
* Combine multiple HTML extensions into one.
*
* @param {Array<HtmlExtension>} htmlExtensions
* List of HTML extensions.
* @returns {HtmlExtension}
* A single combined HTML extension.
*/
export function combineHtmlExtensions(htmlExtensions) {
/** @type {HtmlExtension} */
const handlers = {}
let index = -1
while (++index < htmlExtensions.length) {
htmlExtension(handlers, htmlExtensions[index])
}
return handlers
}
/**
* Merge `extension` into `all`.
*
* @param {HtmlExtension} all
* Extension to merge into.
* @param {HtmlExtension} extension
* Extension to merge.
* @returns {void}
*/
function htmlExtension(all, extension) {
/** @type {keyof HtmlExtension} */
let hook
for (hook in extension) {
const maybe = hasOwnProperty.call(all, hook) ? all[hook] : undefined
const left = maybe || (all[hook] = {})
const right = extension[hook]
/** @type {keyof Handles} */
let type
if (right) {
for (type in right) {
// @ts-expect-error assume document vs regular handler are managed correctly.
left[type] = right[type]
}
}
}
}
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