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| import toRealDom from "./convertVdom.js";
const updateDom = ($parent, oldVNode, newVNode, index) => { const $currentDom = $parent.childNodes[index]; if (!oldVNode) { return $parent.appendChild(toRealDom(newVNode)); }
if (!newVNode) { return $parent.removeChild($currentDom); }
if (typeof oldVNode === "string" && typeof newVNode === "string" && oldVNode === newVNode) { return; }
if (isNodeChanged(oldVNode, newVNode)) { return $parent.replaceChild(toRealDom(newVNode), $currentDom); }
const oldProps = oldVNode.props || {}; const newProps = newVNode.props || {};
if (isPropsChanged(oldProps, newProps)) { const oldPropsKeys = Object.keys(oldProps); const newPropsKeys = Object.keys(newProps);
if (newPropsKeys.length === 0) { oldPropsKeys.forEach((propKey) => { removeProp($currentDom, propKey, oldProps[propKey]); }); } else { const allPropsKeys = new Set([...oldPropsKeys, ...newPropsKeys]); allPropsKeys.forEach((propKey) => { if (!newProps[propKey]) { return removeProp($currentDom, propKey, oldProps[propKey]); } if (newProps[propKey] !== oldProps[propKey]) { return setProp($currentDom, propKey, newProps[propKey]); } }); } }
if ( (oldVNode.children && oldVNode.children.length) || (newVNode.children && newVNode.children.length) ) { for ( let i = 0; i < oldVNode.children.length || i < newVNode.children.length; i++ ) { updateDom($currentDom, oldVNode.children[i], newVNode.children[i], i); } } };
const isNodeChanged = (oldVNode, newVNode) => { if (typeof oldVNode !== typeof newVNode) { return true; }
if (typeof oldVNode === "string" && typeof newVNode === "string") { return oldVNode !== newVNode; }
if (typeof oldVNode === "object" && typeof newVNode === "object") { return oldVNode.type !== newVNode.type; } };
const isPropsChanged = (oldProps, newProps) => { if (typeof oldProps !== typeof newProps) { return true; }
if (typeof oldProps === "object" && typeof newProps === "object") { const oldKeys = Object.keys(oldProps); const newKeys = Object.keys(newProps);
if (oldKeys.length !== newKeys.length) { return true; }
for (let i = 0; i < oldKeys.length; i++) { const key = oldKeys[i]; if (oldProps[key] !== newProps[key]) { return true; } } return false; } return false; };
const isCustomProp = (name) => { return false; };
const isEventProp = (name) => { return /^on/.test(name); };
const extractEventName = (name) => { return name.slice(2).toLowerCase(); }; const removeProp = ($target, name, value) => { if (isCustomProp(name)) { return; } else if (name === "className") { return $target.removeAttribute("class"); } else if (isEventProp(name)) { return $target.removeEventListener(extractEventName(name), value); } else if (typeof value === "boolean") { $target.removeAttribute(name); $target[name] = false; } else { $target.removeAttribute(name); } };
const setProp = ($target, name, value) => { if (isCustomProp(name)) { return; } else if (name === "className") { return $target.setAttribute("class", value); } else if (isEventProp(name)) { return $target.addEventListener(extractEventName(name), value); } else if (typeof value === "boolean") { if (value) { $target.setAttribute(name, value); } $target[name] = value; } else { $target.setAttribute(name, value); } };
export default updateDom;
|