added web vendorsHEADmaster

1 files changed, 514 insertions, 0 deletions

diff --git a/preact/src/diff/index.js b/preact/src/diff/index.js
new file mode 100644
index 0000000..de63843
--- /dev/null
+++ b/preact/src/diff/index.js
@@ -0,0 +1,514 @@
+import { EMPTY_OBJ } from '../constants';
+import { Component, getDomSibling } from '../component';
+import { Fragment } from '../create-element';
+import { diffChildren } from './children';
+import { diffProps, setProperty } from './props';
+import { assign, removeNode, slice } from '../util';
+import options from '../options';
+
+/**
+ * Diff two virtual nodes and apply proper changes to the DOM
+ * @param {import('../internal').PreactElement} parentDom The parent of the DOM element
+ * @param {import('../internal').VNode} newVNode The new virtual node
+ * @param {import('../internal').VNode} oldVNode The old virtual node
+ * @param {object} globalContext The current context object. Modified by getChildContext
+ * @param {boolean} isSvg Whether or not this element is an SVG node
+ * @param {Array<import('../internal').PreactElement>} excessDomChildren
+ * @param {Array<import('../internal').Component>} commitQueue List of components
+ * which have callbacks to invoke in commitRoot
+ * @param {import('../internal').PreactElement} oldDom The current attached DOM
+ * element any new dom elements should be placed around. Likely `null` on first
+ * render (except when hydrating). Can be a sibling DOM element when diffing
+ * Fragments that have siblings. In most cases, it starts out as `oldChildren[0]._dom`.
+ * @param {boolean} [isHydrating] Whether or not we are in hydration
+ */
+export function diff(
+	parentDom,
+	newVNode,
+	oldVNode,
+	globalContext,
+	isSvg,
+	excessDomChildren,
+	commitQueue,
+	oldDom,
+	isHydrating
+) {
+	let tmp,
+		newType = newVNode.type;
+
+	// When passing through createElement it assigns the object
+	// constructor as undefined. This to prevent JSON-injection.
+	if (newVNode.constructor !== undefined) return null;
+
+	// If the previous diff bailed out, resume creating/hydrating.
+	if (oldVNode._hydrating != null) {
+		isHydrating = oldVNode._hydrating;
+		oldDom = newVNode._dom = oldVNode._dom;
+		// if we resume, we want the tree to be "unlocked"
+		newVNode._hydrating = null;
+		excessDomChildren = [oldDom];
+	}
+
+	if ((tmp = options._diff)) tmp(newVNode);
+
+	try {
+		outer: if (typeof newType == 'function') {
+			let c, isNew, oldProps, oldState, snapshot, clearProcessingException;
+			let newProps = newVNode.props;
+
+			// Necessary for createContext api. Setting this property will pass
+			// the context value as `this.context` just for this component.
+			tmp = newType.contextType;
+			let provider = tmp && globalContext[tmp._id];
+			let componentContext = tmp
+				? provider
+					? provider.props.value
+					: tmp._defaultValue
+				: globalContext;
+
+			// Get component and set it to `c`
+			if (oldVNode._component) {
+				c = newVNode._component = oldVNode._component;
+				clearProcessingException = c._processingException = c._pendingError;
+			} else {
+				// Instantiate the new component
+				if ('prototype' in newType && newType.prototype.render) {
+					// @ts-ignore The check above verifies that newType is suppose to be constructed
+					newVNode._component = c = new newType(newProps, componentContext); // eslint-disable-line new-cap
+				} else {
+					// @ts-ignore Trust me, Component implements the interface we want
+					newVNode._component = c = new Component(newProps, componentContext);
+					c.constructor = newType;
+					c.render = doRender;
+				}
+				if (provider) provider.sub(c);
+
+				c.props = newProps;
+				if (!c.state) c.state = {};
+				c.context = componentContext;
+				c._globalContext = globalContext;
+				isNew = c._dirty = true;
+				c._renderCallbacks = [];
+			}
+
+			// Invoke getDerivedStateFromProps
+			if (c._nextState == null) {
+				c._nextState = c.state;
+			}
+			if (newType.getDerivedStateFromProps != null) {
+				if (c._nextState == c.state) {
+					c._nextState = assign({}, c._nextState);
+				}
+
+				assign(
+					c._nextState,
+					newType.getDerivedStateFromProps(newProps, c._nextState)
+				);
+			}
+
+			oldProps = c.props;
+			oldState = c.state;
+
+			// Invoke pre-render lifecycle methods
+			if (isNew) {
+				if (
+					newType.getDerivedStateFromProps == null &&
+					c.componentWillMount != null
+				) {
+					c.componentWillMount();
+				}
+
+				if (c.componentDidMount != null) {
+					c._renderCallbacks.push(c.componentDidMount);
+				}
+			} else {
+				if (
+					newType.getDerivedStateFromProps == null &&
+					newProps !== oldProps &&
+					c.componentWillReceiveProps != null
+				) {
+					c.componentWillReceiveProps(newProps, componentContext);
+				}
+
+				if (
+					(!c._force &&
+						c.shouldComponentUpdate != null &&
+						c.shouldComponentUpdate(
+							newProps,
+							c._nextState,
+							componentContext
+						) === false) ||
+					newVNode._original === oldVNode._original
+				) {
+					c.props = newProps;
+					c.state = c._nextState;
+					// More info about this here: https://gist.github.com/JoviDeCroock/bec5f2ce93544d2e6070ef8e0036e4e8
+					if (newVNode._original !== oldVNode._original) c._dirty = false;
+					c._vnode = newVNode;
+					newVNode._dom = oldVNode._dom;
+					newVNode._children = oldVNode._children;
+					newVNode._children.forEach(vnode => {
+						if (vnode) vnode._parent = newVNode;
+					});
+					if (c._renderCallbacks.length) {
+						commitQueue.push(c);
+					}
+
+					break outer;
+				}
+
+				if (c.componentWillUpdate != null) {
+					c.componentWillUpdate(newProps, c._nextState, componentContext);
+				}
+
+				if (c.componentDidUpdate != null) {
+					c._renderCallbacks.push(() => {
+						c.componentDidUpdate(oldProps, oldState, snapshot);
+					});
+				}
+			}
+
+			c.context = componentContext;
+			c.props = newProps;
+			c.state = c._nextState;
+
+			if ((tmp = options._render)) tmp(newVNode);
+
+			c._dirty = false;
+			c._vnode = newVNode;
+			c._parentDom = parentDom;
+
+			tmp = c.render(c.props, c.state, c.context);
+
+			// Handle setState called in render, see #2553
+			c.state = c._nextState;
+
+			if (c.getChildContext != null) {
+				globalContext = assign(assign({}, globalContext), c.getChildContext());
+			}
+
+			if (!isNew && c.getSnapshotBeforeUpdate != null) {
+				snapshot = c.getSnapshotBeforeUpdate(oldProps, oldState);
+			}
+
+			let isTopLevelFragment =
+				tmp != null && tmp.type === Fragment && tmp.key == null;
+			let renderResult = isTopLevelFragment ? tmp.props.children : tmp;
+
+			diffChildren(
+				parentDom,
+				Array.isArray(renderResult) ? renderResult : [renderResult],
+				newVNode,
+				oldVNode,
+				globalContext,
+				isSvg,
+				excessDomChildren,
+				commitQueue,
+				oldDom,
+				isHydrating
+			);
+
+			c.base = newVNode._dom;
+
+			// We successfully rendered this VNode, unset any stored hydration/bailout state:
+			newVNode._hydrating = null;
+
+			if (c._renderCallbacks.length) {
+				commitQueue.push(c);
+			}
+
+			if (clearProcessingException) {
+				c._pendingError = c._processingException = null;
+			}
+
+			c._force = false;
+		} else if (
+			excessDomChildren == null &&
+			newVNode._original === oldVNode._original
+		) {
+			newVNode._children = oldVNode._children;
+			newVNode._dom = oldVNode._dom;
+		} else {
+			newVNode._dom = diffElementNodes(
+				oldVNode._dom,
+				newVNode,
+				oldVNode,
+				globalContext,
+				isSvg,
+				excessDomChildren,
+				commitQueue,
+				isHydrating
+			);
+		}
+
+		if ((tmp = options.diffed)) tmp(newVNode);
+	} catch (e) {
+		newVNode._original = null;
+		// if hydrating or creating initial tree, bailout preserves DOM:
+		if (isHydrating || excessDomChildren != null) {
+			newVNode._dom = oldDom;
+			newVNode._hydrating = !!isHydrating;
+			excessDomChildren[excessDomChildren.indexOf(oldDom)] = null;
+			// ^ could possibly be simplified to:
+			// excessDomChildren.length = 0;
+		}
+		options._catchError(e, newVNode, oldVNode);
+	}
+}
+
+/**
+ * @param {Array<import('../internal').Component>} commitQueue List of components
+ * which have callbacks to invoke in commitRoot
+ * @param {import('../internal').VNode} root
+ */
+export function commitRoot(commitQueue, root) {
+	if (options._commit) options._commit(root, commitQueue);
+
+	commitQueue.some(c => {
+		try {
+			// @ts-ignore Reuse the commitQueue variable here so the type changes
+			commitQueue = c._renderCallbacks;
+			c._renderCallbacks = [];
+			commitQueue.some(cb => {
+				// @ts-ignore See above ts-ignore on commitQueue
+				cb.call(c);
+			});
+		} catch (e) {
+			options._catchError(e, c._vnode);
+		}
+	});
+}
+
+/**
+ * Diff two virtual nodes representing DOM element
+ * @param {import('../internal').PreactElement} dom The DOM element representing
+ * the virtual nodes being diffed
+ * @param {import('../internal').VNode} newVNode The new virtual node
+ * @param {import('../internal').VNode} oldVNode The old virtual node
+ * @param {object} globalContext The current context object
+ * @param {boolean} isSvg Whether or not this DOM node is an SVG node
+ * @param {*} excessDomChildren
+ * @param {Array<import('../internal').Component>} commitQueue List of components
+ * which have callbacks to invoke in commitRoot
+ * @param {boolean} isHydrating Whether or not we are in hydration
+ * @returns {import('../internal').PreactElement}
+ */
+function diffElementNodes(
+	dom,
+	newVNode,
+	oldVNode,
+	globalContext,
+	isSvg,
+	excessDomChildren,
+	commitQueue,
+	isHydrating
+) {
+	let oldProps = oldVNode.props;
+	let newProps = newVNode.props;
+	let nodeType = newVNode.type;
+	let i = 0;
+
+	// Tracks entering and exiting SVG namespace when descending through the tree.
+	if (nodeType === 'svg') isSvg = true;
+
+	if (excessDomChildren != null) {
+		for (; i < excessDomChildren.length; i++) {
+			const child = excessDomChildren[i];
+
+			// if newVNode matches an element in excessDomChildren or the `dom`
+			// argument matches an element in excessDomChildren, remove it from
+			// excessDomChildren so it isn't later removed in diffChildren
+			if (
+				child &&
+				(child === dom ||
+					(nodeType ? child.localName == nodeType : child.nodeType == 3))
+			) {
+				dom = child;
+				excessDomChildren[i] = null;
+				break;
+			}
+		}
+	}
+
+	if (dom == null) {
+		if (nodeType === null) {
+			// @ts-ignore createTextNode returns Text, we expect PreactElement
+			return document.createTextNode(newProps);
+		}
+
+		if (isSvg) {
+			dom = document.createElementNS(
+				'http://www.w3.org/2000/svg',
+				// @ts-ignore We know `newVNode.type` is a string
+				nodeType
+			);
+		} else {
+			dom = document.createElement(
+				// @ts-ignore We know `newVNode.type` is a string
+				nodeType,
+				newProps.is && newProps
+			);
+		}
+
+		// we created a new parent, so none of the previously attached children can be reused:
+		excessDomChildren = null;
+		// we are creating a new node, so we can assume this is a new subtree (in case we are hydrating), this deopts the hydrate
+		isHydrating = false;
+	}
+
+	if (nodeType === null) {
+		// During hydration, we still have to split merged text from SSR'd HTML.
+		if (oldProps !== newProps && (!isHydrating || dom.data !== newProps)) {
+			dom.data = newProps;
+		}
+	} else {
+		// If excessDomChildren was not null, repopulate it with the current element's children:
+		excessDomChildren = excessDomChildren && slice.call(dom.childNodes);
+
+		oldProps = oldVNode.props || EMPTY_OBJ;
+
+		let oldHtml = oldProps.dangerouslySetInnerHTML;
+		let newHtml = newProps.dangerouslySetInnerHTML;
+
+		// During hydration, props are not diffed at all (including dangerouslySetInnerHTML)
+		// @TODO we should warn in debug mode when props don't match here.
+		if (!isHydrating) {
+			// But, if we are in a situation where we are using existing DOM (e.g. replaceNode)
+			// we should read the existing DOM attributes to diff them
+			if (excessDomChildren != null) {
+				oldProps = {};
+				for (i = 0; i < dom.attributes.length; i++) {
+					oldProps[dom.attributes[i].name] = dom.attributes[i].value;
+				}
+			}
+
+			if (newHtml || oldHtml) {
+				// Avoid re-applying the same '__html' if it did not changed between re-render
+				if (
+					!newHtml ||
+					((!oldHtml || newHtml.__html != oldHtml.__html) &&
+						newHtml.__html !== dom.innerHTML)
+				) {
+					dom.innerHTML = (newHtml && newHtml.__html) || '';
+				}
+			}
+		}
+
+		diffProps(dom, newProps, oldProps, isSvg, isHydrating);
+
+		// If the new vnode didn't have dangerouslySetInnerHTML, diff its children
+		if (newHtml) {
+			newVNode._children = [];
+		} else {
+			i = newVNode.props.children;
+			diffChildren(
+				dom,
+				Array.isArray(i) ? i : [i],
+				newVNode,
+				oldVNode,
+				globalContext,
+				isSvg && nodeType !== 'foreignObject',
+				excessDomChildren,
+				commitQueue,
+				excessDomChildren
+					? excessDomChildren[0]
+					: oldVNode._children && getDomSibling(oldVNode, 0),
+				isHydrating
+			);
+
+			// Remove children that are not part of any vnode.
+			if (excessDomChildren != null) {
+				for (i = excessDomChildren.length; i--; ) {
+					if (excessDomChildren[i] != null) removeNode(excessDomChildren[i]);
+				}
+			}
+		}
+
+		// (as above, don't diff props during hydration)
+		if (!isHydrating) {
+			if (
+				'value' in newProps &&
+				(i = newProps.value) !== undefined &&
+				// #2756 For the <progress>-element the initial value is 0,
+				// despite the attribute not being present. When the attribute
+				// is missing the progress bar is treated as indeterminate.
+				// To fix that we'll always update it when it is 0 for progress elements
+				(i !== dom.value || (nodeType === 'progress' && !i))
+			) {
+				setProperty(dom, 'value', i, oldProps.value, false);
+			}
+			if (
+				'checked' in newProps &&
+				(i = newProps.checked) !== undefined &&
+				i !== dom.checked
+			) {
+				setProperty(dom, 'checked', i, oldProps.checked, false);
+			}
+		}
+	}
+
+	return dom;
+}
+
+/**
+ * Invoke or update a ref, depending on whether it is a function or object ref.
+ * @param {object|function} ref
+ * @param {any} value
+ * @param {import('../internal').VNode} vnode
+ */
+export function applyRef(ref, value, vnode) {
+	try {
+		if (typeof ref == 'function') ref(value);
+		else ref.current = value;
+	} catch (e) {
+		options._catchError(e, vnode);
+	}
+}
+
+/**
+ * Unmount a virtual node from the tree and apply DOM changes
+ * @param {import('../internal').VNode} vnode The virtual node to unmount
+ * @param {import('../internal').VNode} parentVNode The parent of the VNode that
+ * initiated the unmount
+ * @param {boolean} [skipRemove] Flag that indicates that a parent node of the
+ * current element is already detached from the DOM.
+ */
+export function unmount(vnode, parentVNode, skipRemove) {
+	let r;
+	if (options.unmount) options.unmount(vnode);
+
+	if ((r = vnode.ref)) {
+		if (!r.current || r.current === vnode._dom) applyRef(r, null, parentVNode);
+	}
+
+	if ((r = vnode._component) != null) {
+		if (r.componentWillUnmount) {
+			try {
+				r.componentWillUnmount();
+			} catch (e) {
+				options._catchError(e, parentVNode);
+			}
+		}
+
+		r.base = r._parentDom = null;
+	}
+
+	if ((r = vnode._children)) {
+		for (let i = 0; i < r.length; i++) {
+			if (r[i]) {
+				unmount(r[i], parentVNode, typeof vnode.type != 'function');
+			}
+		}
+	}
+
+	if (!skipRemove && vnode._dom != null) removeNode(vnode._dom);
+
+	// Must be set to `undefined` to properly clean up `_nextDom`
+	// for which `null` is a valid value. See comment in `create-element.js`
+	vnode._dom = vnode._nextDom = undefined;
+}
+
+/** The `.render()` method for a PFC backing instance. */
+function doRender(props, state, context) {
+	return this.constructor(props, context);
+}