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import TextNode from "./TextNode";
const svgElements = ['svg', 'use', 'symbol', 'path', 'g', 'defs', 'title'];
export default class ElementNode {
constructor(
/**
* The name of the element
*/
public tag: string,
/**
* The attributes of the element
*/
public attributes: Record<PropertyKey, any> | null,
/**
* The children of the element or the text
*/
public children: (ElementNode | TextNode)[]
) { }
get key(): string {
return this.attributes?.key;
}
/**
* Creates a DOM node from this virtual node
* @returns The text node
*/
createDom(): HTMLElement {
const {
tag,
attributes,
children,
} = this;
let node = null;
// Create the element
Iif (tag === null) { // Fragment node
node = document.createDocumentFragment();
}
else Iif (svgElements.includes(tag) === true) {
node = document.createElementNS('http://www.w3.org/2000/svg', tag);
node.isSvg = true;
} else {
node = document.createElement(tag);
}
for (let key in Object(attributes)) {
setAttribute(node, key, attributes[key]);
}
for (let i = 0; i < children.length; ++i) {
node.appendChild(children[i].createDom());
}
return node;
}
/**
* Patches the DOM node according to the internal state
* @param value
* @returns
*/
patchDom(node: HTMLElement): boolean {
const {
tag,
attributes,
children,
} = this;
let updated = false;
Eif (tag.toUpperCase() === node.tagName) { // Check if the attributes and children changed
if (this._patchAttributes(node, attributes || {}) === true) {
updated = true;
}
if (patchChildren(node, children) === true) {
updated = true;
}
}
else { // Different tags, replace the element
throw `patchDom not implemented for different tags. vnode: ${tag.toUpperCase()}, node: ${node.tagName}`;
// return vnode.$node = node = createNode(vnode);
}
return updated;
}
private _patchAttributes(node: HTMLElement, attributes: Record<PropertyKey, any> = {}): boolean {
let updated = false;
const nodeAttributes = toRecord(node.attributes);
const mergedAttributes = { ...nodeAttributes, ...attributes};
for (const key of Object.keys(mergedAttributes)) {
const value = attributes[key];
Iif (value === undefined) { // It was removed in the new virtual node
node.removeAttribute(key);
updated = true;
}
else {
const oldValue = nodeAttributes[key];
if (value !== oldValue) {
setAttribute(node, key, value);
updated = true;
}
}
}
return updated;
}
}
function setAttribute(node: HTMLElement, key: string, value: string) {
Iif (value === 'undefined' ||
value === 'null' ||
value === '' ||
value === 'false') {
(node as HTMLElement).removeAttribute(key);
}
else {
Iif (value === 'true') {
(node as HTMLElement).setAttribute(key, '');
}
else {
(node as HTMLElement).setAttribute(key, value);
}
}
}
function toRecord(attributes: NamedNodeMap): Record<PropertyKey, string> {
const record: Record<PropertyKey, string> = {};
const length = attributes.length;
for (let i = 0; i < length; ++i) {
const attribute = attributes[i];
record[attribute.name] = attribute.value;
}
return record;
}
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