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Directory : /var/app/indomilk/frontend/node_modules/preact/src/

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Current File : /var/app/indomilk/frontend/node_modules/preact/src/component.js

import { assign } from './util';
import { diff, commitRoot } from './diff/index';
import options from './options';
import { Fragment } from './create-element';
import { MODE_HYDRATE } from './constants';

/**
 * Base Component class. Provides `setState()` and `forceUpdate()`, which
 * trigger rendering
 * @param {object} props The initial component props
 * @param {object} context The initial context from parent components'
 * getChildContext
 */
export function BaseComponent(props, context) {
	this.props = props;
	this.context = context;
}

/**
 * Update component state and schedule a re-render.
 * @this {Component}
 * @param {object | ((s: object, p: object) => object)} update A hash of state
 * properties to update with new values or a function that given the current
 * state and props returns a new partial state
 * @param {() => void} [callback] A function to be called once component state is
 * updated
 */
BaseComponent.prototype.setState = function (update, callback) {
	// only clone state when copying to nextState the first time.
	let s;
	if (this._nextState != null && this._nextState !== this.state) {
		s = this._nextState;
	} else {
		s = this._nextState = assign({}, this.state);
	}

	if (typeof update == 'function') {
		// Some libraries like `immer` mark the current state as readonly,
		// preventing us from mutating it, so we need to clone it. See #2716
		update = update(assign({}, s), this.props);
	}

	if (update) {
		assign(s, update);
	}

	// Skip update if updater function returned null
	if (update == null) return;

	if (this._vnode) {
		if (callback) {
			this._stateCallbacks.push(callback);
		}
		enqueueRender(this);
	}
};

/**
 * Immediately perform a synchronous re-render of the component
 * @this {Component}
 * @param {() => void} [callback] A function to be called after component is
 * re-rendered
 */
BaseComponent.prototype.forceUpdate = function (callback) {
	if (this._vnode) {
		// Set render mode so that we can differentiate where the render request
		// is coming from. We need this because forceUpdate should never call
		// shouldComponentUpdate
		this._force = true;
		if (callback) this._renderCallbacks.push(callback);
		enqueueRender(this);
	}
};

/**
 * Accepts `props` and `state`, and returns a new Virtual DOM tree to build.
 * Virtual DOM is generally constructed via [JSX](http://jasonformat.com/wtf-is-jsx).
 * @param {object} props Props (eg: JSX attributes) received from parent
 * element/component
 * @param {object} state The component's current state
 * @param {object} context Context object, as returned by the nearest
 * ancestor's `getChildContext()`
 * @returns {ComponentChildren | void}
 */
BaseComponent.prototype.render = Fragment;

/**
 * @param {VNode} vnode
 * @param {number | null} [childIndex]
 */
export function getDomSibling(vnode, childIndex) {
	if (childIndex == null) {
		// Use childIndex==null as a signal to resume the search from the vnode's sibling
		return vnode._parent
			? getDomSibling(vnode._parent, vnode._index + 1)
			: null;
	}

	let sibling;
	for (; childIndex < vnode._children.length; childIndex++) {
		sibling = vnode._children[childIndex];

		if (sibling != null && sibling._dom != null) {
			// Since updateParentDomPointers keeps _dom pointer correct,
			// we can rely on _dom to tell us if this subtree contains a
			// rendered DOM node, and what the first rendered DOM node is
			return sibling._dom;
		}
	}

	// If we get here, we have not found a DOM node in this vnode's children.
	// We must resume from this vnode's sibling (in it's parent _children array)
	// Only climb up and search the parent if we aren't searching through a DOM
	// VNode (meaning we reached the DOM parent of the original vnode that began
	// the search)
	return typeof vnode.type == 'function' ? getDomSibling(vnode) : null;
}

/**
 * Trigger in-place re-rendering of a component.
 * @param {Component} component The component to rerender
 */
function renderComponent(component) {
	let oldVNode = component._vnode,
		oldDom = oldVNode._dom,
		commitQueue = [],
		refQueue = [];

	if (component._parentDom) {
		const newVNode = assign({}, oldVNode);
		newVNode._original = oldVNode._original + 1;
		if (options.vnode) options.vnode(newVNode);

		diff(
			component._parentDom,
			newVNode,
			oldVNode,
			component._globalContext,
			component._parentDom.namespaceURI,
			oldVNode._flags & MODE_HYDRATE ? [oldDom] : null,
			commitQueue,
			oldDom == null ? getDomSibling(oldVNode) : oldDom,
			!!(oldVNode._flags & MODE_HYDRATE),
			refQueue
		);

		newVNode._original = oldVNode._original;
		newVNode._parent._children[newVNode._index] = newVNode;
		commitRoot(commitQueue, newVNode, refQueue);

		if (newVNode._dom != oldDom) {
			updateParentDomPointers(newVNode);
		}
	}
}

/**
 * @param {VNode} vnode
 */
function updateParentDomPointers(vnode) {
	if ((vnode = vnode._parent) != null && vnode._component != null) {
		vnode._dom = vnode._component.base = null;
		for (let i = 0; i < vnode._children.length; i++) {
			let child = vnode._children[i];
			if (child != null && child._dom != null) {
				vnode._dom = vnode._component.base = child._dom;
				break;
			}
		}

		return updateParentDomPointers(vnode);
	}
}

/**
 * The render queue
 * @type {Array<Component>}
 */
let rerenderQueue = [];

/*
 * The value of `Component.debounce` must asynchronously invoke the passed in callback. It is
 * important that contributors to Preact can consistently reason about what calls to `setState`, etc.
 * do, and when their effects will be applied. See the links below for some further reading on designing
 * asynchronous APIs.
 * * [Designing APIs for Asynchrony](https://blog.izs.me/2013/08/designing-apis-for-asynchrony)
 * * [Callbacks synchronous and asynchronous](https://blog.ometer.com/2011/07/24/callbacks-synchronous-and-asynchronous/)
 */

let prevDebounce;

const defer =
	typeof Promise == 'function'
		? Promise.prototype.then.bind(Promise.resolve())
		: setTimeout;

/**
 * Enqueue a rerender of a component
 * @param {Component} c The component to rerender
 */
export function enqueueRender(c) {
	if (
		(!c._dirty &&
			(c._dirty = true) &&
			rerenderQueue.push(c) &&
			!process._rerenderCount++) ||
		prevDebounce !== options.debounceRendering
	) {
		prevDebounce = options.debounceRendering;
		(prevDebounce || defer)(process);
	}
}

/**
 * @param {Component} a
 * @param {Component} b
 */
const depthSort = (a, b) => a._vnode._depth - b._vnode._depth;

/** Flush the render queue by rerendering all queued components */
function process() {
	let c;
	rerenderQueue.sort(depthSort);
	// Don't update `renderCount` yet. Keep its value non-zero to prevent unnecessary
	// process() calls from getting scheduled while `queue` is still being consumed.
	while ((c = rerenderQueue.shift())) {
		if (c._dirty) {
			let renderQueueLength = rerenderQueue.length;
			renderComponent(c);
			if (rerenderQueue.length > renderQueueLength) {
				// When i.e. rerendering a provider additional new items can be injected, we want to
				// keep the order from top to bottom with those new items so we can handle them in a
				// single pass
				rerenderQueue.sort(depthSort);
			}
		}
	}
	process._rerenderCount = 0;
}

process._rerenderCount = 0;

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