Precise DOM morphing
morphing
typescript
dom
Better minification with # private properties
+62
-62
+62
-62
src/morphlex.ts
+62
-62
src/morphlex.ts
···
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}
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class Morph {
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-
private readonly idMap: IdMap = new WeakMap()
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-
private readonly options: Options
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+
readonly #idMap: IdMap = new WeakMap()
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+
readonly #options: Options
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constructor(options: Options = {}) {
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this.options = options
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this.#options = options
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}
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// Find longest increasing subsequence to minimize moves during reordering
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// Returns the indices in the sequence that form the LIS
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private longestIncreasingSubsequence(sequence: Array<number>): Array<number> {
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#longestIncreasingSubsequence(sequence: Array<number>): Array<number> {
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const n = sequence.length
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if (n === 0) return []
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···
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morph(from: ChildNode, to: ChildNode | NodeListOf<ChildNode>): void {
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if (isParentNode(from)) {
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this.mapIdSets(from)
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this.#mapIdSets(from)
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}
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if (to instanceof NodeList) {
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this.mapIdSetsForEach(to)
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this.morphOneToMany(from, to)
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this.#mapIdSetsForEach(to)
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this.#morphOneToMany(from, to)
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} else if (isParentNode(to)) {
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this.mapIdSets(to)
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this.morphOneToOne(from, to)
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this.#mapIdSets(to)
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this.#morphOneToOne(from, to)
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}
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}
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private morphOneToMany(from: ChildNode, to: NodeListOf<ChildNode>): void {
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#morphOneToMany(from: ChildNode, to: NodeListOf<ChildNode>): void {
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const length = to.length
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if (length === 0) {
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this.removeNode(from)
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this.#removeNode(from)
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} else if (length === 1) {
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this.morphOneToOne(from, to[0]!)
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this.#morphOneToOne(from, to[0]!)
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} else if (length > 1) {
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const newNodes = Array.from(to)
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this.morphOneToOne(from, newNodes.shift()!)
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this.#morphOneToOne(from, newNodes.shift()!)
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const insertionPoint = from.nextSibling
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const parent = from.parentNode || document
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for (const newNode of newNodes) {
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if (this.options.beforeNodeAdded?.(parent, newNode, insertionPoint) ?? true) {
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if (this.#options.beforeNodeAdded?.(parent, newNode, insertionPoint) ?? true) {
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moveBefore(parent, newNode, insertionPoint)
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this.options.afterNodeAdded?.(newNode)
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this.#options.afterNodeAdded?.(newNode)
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}
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}
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}
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}
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private morphOneToOne(from: ChildNode, to: ChildNode): void {
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#morphOneToOne(from: ChildNode, to: ChildNode): void {
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// Fast path: if nodes are exactly the same object, skip morphing
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if (from === to) return
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if (from.isEqualNode?.(to)) return
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if (!(this.options.beforeNodeVisited?.(from, to) ?? true)) return
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if (!(this.#options.beforeNodeVisited?.(from, to) ?? true)) return
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const pair: PairOfNodes<ChildNode> = [from, to]
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if (isElementPair(pair)) {
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if (isMatchingElementPair(pair)) {
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this.morphMatchingElements(pair)
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this.#morphMatchingElements(pair)
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} else {
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this.morphNonMatchingElements(pair)
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this.#morphNonMatchingElements(pair)
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}
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} else {
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this.morphOtherNode(pair)
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this.#morphOtherNode(pair)
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}
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this.options.afterNodeVisited?.(from, to)
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this.#options.afterNodeVisited?.(from, to)
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}
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private morphMatchingElements(pair: PairOfMatchingElements<Element>): void {
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#morphMatchingElements(pair: PairOfMatchingElements<Element>): void {
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const [from, to] = pair
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if (from.hasAttributes() || to.hasAttributes()) {
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this.visitAttributes(pair)
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this.#visitAttributes(pair)
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}
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if (isTextAreaElement(from) && isTextAreaElement(to)) {
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this.visitTextArea(pair as PairOfMatchingElements<HTMLTextAreaElement>)
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this.#visitTextArea(pair as PairOfMatchingElements<HTMLTextAreaElement>)
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} else if (from.hasChildNodes() || to.hasChildNodes()) {
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this.visitChildNodes(pair)
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}
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}
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private morphNonMatchingElements([from, to]: PairOfNodes<Element>): void {
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this.replaceNode(from, to)
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#morphNonMatchingElements([from, to]: PairOfNodes<Element>): void {
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this.#replaceNode(from, to)
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}
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private morphOtherNode([from, to]: PairOfNodes<ChildNode>): void {
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#morphOtherNode([from, to]: PairOfNodes<ChildNode>): void {
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if (from.nodeType === to.nodeType && from.nodeValue !== null && to.nodeValue !== null) {
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from.nodeValue = to.nodeValue
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} else {
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this.replaceNode(from, to)
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this.#replaceNode(from, to)
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}
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}
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private visitAttributes([from, to]: PairOfMatchingElements<Element>): void {
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#visitAttributes([from, to]: PairOfMatchingElements<Element>): void {
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if (from.hasAttribute("morphlex-dirty")) {
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from.removeAttribute("morphlex-dirty")
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}
···
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for (const { name, value } of to.attributes) {
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if (name === "value") {
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if (isInputElement(from) && from.value !== value) {
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if (!this.options.preserveModified || from.value === from.defaultValue) {
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if (!this.#options.preserveModified || from.value === from.defaultValue) {
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from.value = value
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}
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}
···
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if (name === "selected") {
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if (isOptionElement(from) && !from.selected) {
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if (!this.options.preserveModified || from.selected === from.defaultSelected) {
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if (!this.#options.preserveModified || from.selected === from.defaultSelected) {
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from.selected = true
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}
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}
···
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if (name === "checked") {
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if (isInputElement(from) && !from.checked) {
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if (!this.options.preserveModified || from.checked === from.defaultChecked) {
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if (!this.#options.preserveModified || from.checked === from.defaultChecked) {
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from.checked = true
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}
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}
···
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const oldValue = from.getAttribute(name)
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if (oldValue !== value && (this.options.beforeAttributeUpdated?.(from, name, value) ?? true)) {
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if (oldValue !== value && (this.#options.beforeAttributeUpdated?.(from, name, value) ?? true)) {
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from.setAttribute(name, value)
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this.options.afterAttributeUpdated?.(from, name, oldValue)
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this.#options.afterAttributeUpdated?.(from, name, oldValue)
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}
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}
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···
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if (!to.hasAttribute(name)) {
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if (name === "selected") {
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if (isOptionElement(from) && from.selected) {
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if (!this.options.preserveModified || from.selected === from.defaultSelected) {
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if (!this.#options.preserveModified || from.selected === from.defaultSelected) {
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from.selected = false
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}
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}
···
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if (name === "checked") {
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if (isInputElement(from) && from.checked) {
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if (!this.options.preserveModified || from.checked === from.defaultChecked) {
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if (!this.#options.preserveModified || from.checked === from.defaultChecked) {
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from.checked = false
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}
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}
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}
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if (this.options.beforeAttributeUpdated?.(from, name, null) ?? true) {
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if (this.#options.beforeAttributeUpdated?.(from, name, null) ?? true) {
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from.removeAttribute(name)
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this.options.afterAttributeUpdated?.(from, name, value)
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this.#options.afterAttributeUpdated?.(from, name, value)
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}
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}
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}
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}
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private visitTextArea([from, to]: PairOfMatchingElements<HTMLTextAreaElement>): void {
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#visitTextArea([from, to]: PairOfMatchingElements<HTMLTextAreaElement>): void {
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const newTextContent = to.textContent || ""
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const isModified = from.value !== from.defaultValue
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···
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from.textContent = newTextContent
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}
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if (this.options.preserveModified && isModified) return
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if (this.#options.preserveModified && isModified) return
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from.value = from.defaultValue
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}
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visitChildNodes([from, to]: PairOfMatchingElements<Element>): void {
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if (!(this.options.beforeChildrenVisited?.(from) ?? true)) return
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if (!(this.#options.beforeChildrenVisited?.(from) ?? true)) return
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const parent = from
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const fromChildNodes = from.childNodes
···
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const element = toChildNodes[i]!
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if (!isElement(element)) continue
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const idSet = this.idMap.get(element)
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const idSet = this.#idMap.get(element)
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if (!idSet) continue
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candidateLoop: for (const candidate of candidateElements) {
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if (isElement(candidate)) {
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const candidateIdSet = this.idMap.get(candidate)
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const candidateIdSet = this.#idMap.get(candidate)
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if (candidateIdSet) {
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for (const id of idSet) {
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if (candidateIdSet.has(id)) {
···
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}
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// Find LIS - these nodes don't need to move
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const lisIndices = this.longestIncreasingSubsequence(sequence)
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const lisIndices = this.#longestIncreasingSubsequence(sequence)
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const shouldNotMove = new Set<number>()
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for (const idx of lisIndices) {
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shouldNotMove.add(sequence[idx]!)
···
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if (!shouldNotMove.has(matchIndex)) {
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moveBefore(parent, match, insertionPoint)
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}
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this.morphOneToOne(match, node)
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+
this.#morphOneToOne(match, node)
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insertionPoint = match.nextSibling
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// Skip over any nodes that will be removed to avoid unnecessary moves
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while (
···
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insertionPoint = insertionPoint.nextSibling
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}
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} else {
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if (this.options.beforeNodeAdded?.(parent, node, insertionPoint) ?? true) {
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+
if (this.#options.beforeNodeAdded?.(parent, node, insertionPoint) ?? true) {
531
531
moveBefore(parent, node, insertionPoint)
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this.options.afterNodeAdded?.(node)
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+
this.#options.afterNodeAdded?.(node)
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insertionPoint = node.nextSibling
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// Skip over any nodes that will be removed to avoid unnecessary moves
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while (
···
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// Remove any remaining unmatched candidates
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for (const candidate of candidateNodes) {
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this.removeNode(candidate)
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+
this.#removeNode(candidate)
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}
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for (const candidate of candidateElements) {
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this.removeNode(candidate)
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+
this.#removeNode(candidate)
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}
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this.options.afterChildrenVisited?.(from)
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+
this.#options.afterChildrenVisited?.(from)
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}
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-
private replaceNode(node: ChildNode, newNode: ChildNode): void {
557
+
#replaceNode(node: ChildNode, newNode: ChildNode): void {
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558
const parent = node.parentNode || document
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const insertionPoint = node
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-
if (this.options.beforeNodeAdded?.(parent, newNode, insertionPoint) ?? true) {
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+
if (this.#options.beforeNodeAdded?.(parent, newNode, insertionPoint) ?? true) {
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561
moveBefore(parent, newNode, insertionPoint)
562
-
this.options.afterNodeAdded?.(newNode)
563
-
this.removeNode(node)
562
+
this.#options.afterNodeAdded?.(newNode)
563
+
this.#removeNode(node)
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}
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}
566
566
567
-
private removeNode(node: ChildNode): void {
568
-
if (this.options.beforeNodeRemoved?.(node) ?? true) {
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+
#removeNode(node: ChildNode): void {
568
+
if (this.#options.beforeNodeRemoved?.(node) ?? true) {
569
569
node.remove()
570
-
this.options.afterNodeRemoved?.(node)
570
+
this.#options.afterNodeRemoved?.(node)
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571
}
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572
}
573
573
574
-
private mapIdSetsForEach(nodeList: NodeList): void {
574
+
#mapIdSetsForEach(nodeList: NodeList): void {
575
575
for (const childNode of nodeList) {
576
576
if (isParentNode(childNode)) {
577
-
this.mapIdSets(childNode)
577
+
this.#mapIdSets(childNode)
578
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}
579
579
}
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580
}
581
581
582
582
// For each node with an ID, push that ID into the IdSet on the IdMap, for each of its parent elements.
583
-
private mapIdSets(node: ParentNode): void {
583
+
#mapIdSets(node: ParentNode): void {
584
584
for (const elementWithId of node.querySelectorAll("[id]")) {
585
585
const id = elementWithId.id
586
586
···
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589
let currentElement: Element | null = elementWithId
590
590
591
591
while (currentElement) {
592
-
const idSet: IdSet | undefined = this.idMap.get(currentElement)
592
+
const idSet: IdSet | undefined = this.#idMap.get(currentElement)
593
593
if (idSet) idSet.add(id)
594
-
else this.idMap.set(currentElement, new Set([id]))
594
+
else this.#idMap.set(currentElement, new Set([id]))
595
595
if (currentElement === node) break
596
596
currentElement = currentElement.parentElement
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597
}