178 lines
5.2 KiB
TypeScript
178 lines
5.2 KiB
TypeScript
// import { MutationQueue, CustomMutationQueue } from "./MutationQueue"
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// export class Diff {
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// static persistentClasses = new Set<string>()
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// static persistentAttributes = new Set<string>()
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// // Reuse container for diffs to avoid memory allocation
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// static container: HTMLElement
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// static rootContainer: HTMLElement
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// static mutations: CustomMutationQueue = new CustomMutationQueue()
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// // Callbacks
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// static onStart: () => void
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// static onMutationsQueued: (elem: HTMLElement) => void
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// // innerHTML will diff the element with the given HTML string and apply DOM mutations.
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// static innerHTML(aRoot: HTMLElement, html: string): Promise<void> {
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// return new Promise((resolve, reject) => {
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// if(!Diff.container) {
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// Diff.container = document.createElement("main")
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// }
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// Diff.container.innerHTML = html
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// if(Diff.onStart) {
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// Diff.onStart()
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// }
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// Diff.childNodes(aRoot, Diff.container)
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// this.mutations.wait(resolve)
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// })
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// }
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// // root will diff the document root element with the given HTML string and apply DOM mutations.
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// static root(aRoot: HTMLElement, html: string) {
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// return new Promise((resolve, reject) => {
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// if(!Diff.rootContainer) {
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// Diff.rootContainer = document.createElement("html")
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// }
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// Diff.rootContainer.innerHTML = html.replace("<!DOCTYPE html>", "")
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// if(Diff.onStart) {
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// Diff.onStart()
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// }
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// Diff.childNodes(aRoot.getElementsByTagName("body")[0], Diff.rootContainer.getElementsByTagName("body")[0])
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// this.mutations.wait(resolve)
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// })
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// }
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// // childNodes diffs the child nodes of 2 given elements and applies DOM mutations.
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// static childNodes(aRoot: Node, bRoot: Node) {
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// let aChild = [...aRoot.childNodes]
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// let bChild = [...bRoot.childNodes]
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// let numNodes = Math.max(aChild.length, bChild.length)
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// for(let i = 0; i < numNodes; i++) {
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// let a = aChild[i]
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// // Remove nodes at the end of a that do not exist in b
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// if(i >= bChild.length) {
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// this.mutations.queue(() => aRoot.removeChild(a))
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// continue
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// }
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// let b = bChild[i]
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// // If a doesn't have that many nodes, simply append at the end of a
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// if(i >= aChild.length) {
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// this.mutations.queue(() => aRoot.appendChild(b))
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// if(Diff.onMutationsQueued && b.nodeType === Node.ELEMENT_NODE) {
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// Diff.onMutationsQueued(b as HTMLElement)
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// }
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// continue
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// }
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// // If it's a completely different HTML tag or node type, replace it
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// if(a.nodeName !== b.nodeName || a.nodeType !== b.nodeType) {
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// this.mutations.queue(() => aRoot.replaceChild(b, a))
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// if(Diff.onMutationsQueued && b.nodeType === Node.ELEMENT_NODE) {
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// Diff.onMutationsQueued(b as HTMLElement)
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// }
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// continue
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// }
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// // Text node:
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// // We don't need to check for b to be a text node as well because
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// // we eliminated different node types in the previous condition.
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// if(a.nodeType === Node.TEXT_NODE) {
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// this.mutations.queue(() => a.textContent = b.textContent)
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// continue
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// }
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// // HTML element:
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// if(a.nodeType === Node.ELEMENT_NODE) {
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// let elemA = a as HTMLElement
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// let elemB = b as HTMLElement
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// let removeAttributes: Attr[] = []
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// for(let x = 0; x < elemA.attributes.length; x++) {
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// let attrib = elemA.attributes[x]
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// if(attrib.specified) {
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// if(!elemB.hasAttribute(attrib.name) && !Diff.persistentAttributes.has(attrib.name)) {
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// removeAttributes.push(attrib)
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// }
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// }
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// }
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// this.mutations.queue(() => {
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// for(let attr of removeAttributes) {
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// elemA.removeAttributeNode(attr)
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// }
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// })
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// for(let x = 0; x < elemB.attributes.length; x++) {
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// let attrib = elemB.attributes[x]
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// if(!attrib.specified) {
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// continue
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// }
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// // If the attribute value is exactly the same, skip this attribute.
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// if(elemA.getAttribute(attrib.name) === attrib.value) {
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// continue
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// }
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// if(attrib.name === "class") {
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// let classesA = elemA.classList
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// let classesB = elemB.classList
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// let removeClasses: string[] = []
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// for(let className of classesA) {
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// if(!classesB.contains(className) && !Diff.persistentClasses.has(className)) {
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// removeClasses.push(className)
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// }
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// }
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// this.mutations.queue(() => {
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// for(let className of removeClasses) {
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// classesA.remove(className)
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// }
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// for(let className of classesB) {
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// if(!classesA.contains(className)) {
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// classesA.add(className)
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// }
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// }
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// })
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// continue
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// }
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// this.mutations.queue(() => elemA.setAttribute(attrib.name, attrib.value))
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// }
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// // Special case: Apply state of input elements
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// if(elemA !== document.activeElement && elemA instanceof HTMLInputElement && elemB instanceof HTMLInputElement) {
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// this.mutations.queue(() => {
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// (elemA as HTMLInputElement).value = (elemB as HTMLInputElement).value
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// })
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// }
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// }
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// Diff.childNodes(a, b)
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// if(Diff.onMutationsQueued && a.nodeType === Node.ELEMENT_NODE) {
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// Diff.onMutationsQueued(a as HTMLElement)
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// }
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// }
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// }
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// }
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