mithril/render/vnode.js

A framework for building brilliant applications

"use strict"

function Vnode(tag, key, attrs, children, text, dom) {
	return {tag: tag, key: key, attrs: attrs, children: children, text: text, dom: dom, domSize: undefined, state: undefined, events: undefined, instance: undefined}
}
Vnode.normalize = function(node) {
	if (Array.isArray(node)) return Vnode("[", undefined, undefined, Vnode.normalizeChildren(node), undefined, undefined)
	if (node == null || typeof node === "boolean") return null
	if (typeof node === "object") return node
	return Vnode("#", undefined, undefined, String(node), undefined, undefined)
}
Vnode.normalizeChildren = function(input) {
	var children = []
	if (input.length) {
		var isKeyed = input[0] != null && input[0].key != null
		// Note: this is a *very* perf-sensitive check.
		// Fun fact: merging the loop like this is somehow faster than splitting
		// it, noticeably so.
		for (var i = 1; i < input.length; i++) {
			if ((input[i] != null && input[i].key != null) !== isKeyed) {
				throw new TypeError(
					isKeyed && (input[i] != null || typeof input[i] === "boolean")
						? "In fragments, vnodes must either all have keys or none have keys. You may wish to consider using an explicit keyed empty fragment, m.fragment({key: ...}), instead of a hole."
						: "In fragments, vnodes must either all have keys or none have keys."
				)
			}
		}
		for (var i = 0; i < input.length; i++) {
			children[i] = Vnode.normalize(input[i])
		}
	}
	return children
}

module.exports = Vnode