-
-
Notifications
You must be signed in to change notification settings - Fork 1.9k
/
index.js
347 lines (297 loc) · 10.6 KB
/
index.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
import { EMPTY_OBJ, EMPTY_ARR } from '../constants';
import { Component, enqueueRender } from '../component';
import { coerceToVNode, Fragment } from '../create-element';
import { diffChildren, toChildArray } from './children';
import { diffProps } from './props';
import { assign, removeNode } 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 | null} newVNode The new virtual node
* @param {import('../internal').VNode | null} oldVNode The old virtual node
* @param {object} context The current context object
* @param {boolean} isSvg Whether or not this element is an SVG node
* @param {Array<import('../internal').PreactElement>} excessDomChildren
* @param {Array<import('../internal').Component>} mounts A list of newly
* mounted components
* @param {Element | Text} 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`.
*/
export function diff(parentDom, newVNode, oldVNode, context, isSvg, excessDomChildren, mounts, force, oldDom) {
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 (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 && context[tmp._id];
let cctx = tmp ? (provider ? provider.props.value : tmp._defaultValue) : context;
// 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 (newType.prototype && newType.prototype.render) {
newVNode._component = c = new newType(newProps, cctx); // eslint-disable-line new-cap
}
else {
newVNode._component = c = new Component(newProps, cctx);
c.constructor = newType;
c.render = doRender;
}
if (provider) provider.sub(c);
c.props = newProps;
if (!c.state) c.state = {};
c.context = cctx;
c._context = context;
isNew = c._dirty = true;
c._renderCallbacks = [];
}
// Invoke getDerivedStateFromProps
if (c._nextState==null) {
c._nextState = c.state;
}
if (newType.getDerivedStateFromProps!=null) {
assign(c._nextState==c.state ? (c._nextState = assign({}, c._nextState)) : c._nextState, newType.getDerivedStateFromProps(newProps, c._nextState));
}
// Invoke pre-render lifecycle methods
if (isNew) {
if (newType.getDerivedStateFromProps==null && c.componentWillMount!=null) c.componentWillMount();
if (c.componentDidMount!=null) mounts.push(c);
}
else {
if (newType.getDerivedStateFromProps==null && force==null && c.componentWillReceiveProps!=null) {
c.componentWillReceiveProps(newProps, cctx);
}
if (!force && c.shouldComponentUpdate!=null && c.shouldComponentUpdate(newProps, c._nextState, cctx)===false) {
c.props = newProps;
c.state = c._nextState;
c._dirty = false;
c._vnode = newVNode;
newVNode._dom = oldVNode._dom;
newVNode._children = oldVNode._children;
break outer;
}
if (c.componentWillUpdate!=null) {
c.componentWillUpdate(newProps, c._nextState, cctx);
}
}
oldProps = c.props;
oldState = c.state;
c.context = cctx;
c.props = newProps;
c.state = c._nextState;
if (tmp = options._render) tmp(newVNode);
c._dirty = false;
c._vnode = newVNode;
c._parentDom = parentDom;
try {
tmp = c.render(c.props, c.state, c.context);
let isTopLevelFragment = tmp != null && tmp.type == Fragment && tmp.key == null;
toChildArray(isTopLevelFragment ? tmp.props.children : tmp, newVNode._children=[], coerceToVNode, true);
}
catch (e) {
if ((tmp = options._catchRender) && tmp(e, newVNode, oldVNode)) break outer;
throw e;
}
if (c.getChildContext!=null) {
context = assign(assign({}, context), c.getChildContext());
}
if (!isNew && c.getSnapshotBeforeUpdate!=null) {
snapshot = c.getSnapshotBeforeUpdate(oldProps, oldState);
}
diffChildren(parentDom, newVNode, oldVNode, context, isSvg, excessDomChildren, mounts, oldDom);
c.base = newVNode._dom;
while (tmp=c._renderCallbacks.pop()) tmp.call(c);
// Don't call componentDidUpdate on mount or when we bailed out via
// `shouldComponentUpdate`
if (!isNew && oldProps!=null && c.componentDidUpdate!=null) {
c.componentDidUpdate(oldProps, oldState, snapshot);
}
if (clearProcessingException) {
c._pendingError = c._processingException = null;
}
}
else {
newVNode._dom = diffElementNodes(oldVNode._dom, newVNode, oldVNode, context, isSvg, excessDomChildren, mounts);
}
if (tmp = options.diffed) tmp(newVNode);
}
catch (e) {
catchErrorInComponent(e, newVNode._parent);
}
return newVNode._dom;
}
export function commitRoot(mounts, root) {
let c;
while ((c = mounts.pop())) {
try {
c.componentDidMount();
}
catch (e) {
catchErrorInComponent(e, c._vnode._parent);
}
}
if (options._commit) options._commit(root);
}
/**
* 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} context The current context object
* @param {boolean} isSvg Whether or not this DOM node is an SVG node
* @param {*} excessDomChildren
* @param {Array<import('../internal').Component>} mounts An array of newly
* mounted components
* @returns {import('../internal').PreactElement}
*/
function diffElementNodes(dom, newVNode, oldVNode, context, isSvg, excessDomChildren, mounts) {
let i;
let oldProps = oldVNode.props;
let newProps = newVNode.props;
// Tracks entering and exiting SVG namespace when descending through the tree.
isSvg = newVNode.type==='svg' || isSvg;
if (dom==null && excessDomChildren!=null) {
for (i=0; i<excessDomChildren.length; i++) {
const child = excessDomChildren[i];
if (child!=null && (newVNode.type===null ? child.nodeType===3 : child.localName===newVNode.type)) {
dom = child;
excessDomChildren[i] = null;
break;
}
}
}
if (dom==null) {
if (newVNode.type===null) {
return document.createTextNode(newProps);
}
dom = isSvg ? document.createElementNS('http://www.w3.org/2000/svg', newVNode.type) : document.createElement(newVNode.type);
// we created a new parent, so none of the previously attached children can be reused:
excessDomChildren = null;
}
if (newVNode.type===null) {
if (oldProps !== newProps) {
dom.data = newProps;
}
}
else if (newVNode!==oldVNode) {
if (excessDomChildren!=null) {
excessDomChildren = EMPTY_ARR.slice.call(dom.childNodes);
}
oldProps = oldVNode.props || EMPTY_OBJ;
let oldHtml = oldProps.dangerouslySetInnerHTML;
let newHtml = newProps.dangerouslySetInnerHTML;
if ((newHtml || oldHtml) && excessDomChildren==null) {
// Avoid re-applying the same '__html' if it did not changed between re-render
if (!newHtml || !oldHtml || newHtml.__html!=oldHtml.__html) {
dom.innerHTML = newHtml && newHtml.__html || '';
}
}
if (newProps.multiple) {
dom.multiple = newProps.multiple;
}
diffChildren(dom, newVNode, oldVNode, context, newVNode.type==='foreignObject' ? false : isSvg, excessDomChildren, mounts, EMPTY_OBJ);
diffProps(dom, newProps, oldProps, isSvg);
}
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} parentVNode
*/
export function applyRef(ref, value, parentVNode) {
try {
if (typeof ref=='function') ref(value);
else ref.current = value;
}
catch (e) {
catchErrorInComponent(e, parentVNode);
}
}
/**
* 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) {
applyRef(r, null, parentVNode);
}
let dom;
if (!skipRemove && typeof vnode.type !== 'function') {
skipRemove = (dom = vnode._dom)!=null;
}
vnode._dom = vnode._lastDomChild = null;
if ((r = vnode._component)!=null) {
if (r.componentWillUnmount) {
try {
r.componentWillUnmount();
}
catch (e) {
catchErrorInComponent(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, skipRemove);
}
}
if (dom!=null) removeNode(dom);
}
/** The `.render()` method for a PFC backing instance. */
function doRender(props, state, context) {
return this.constructor(props, context);
}
/**
* Find the closest error boundary to a thrown error and call it
* @param {object} error The thrown value
* @param {import('../internal').VNode} vnode The first ancestor
* VNode check for error boundary behaviors
*/
function catchErrorInComponent(error, vnode) {
if (options._catchError) { options._catchError(error, vnode); }
/** @type {import('../internal').Component} */
let component;
for (; vnode; vnode = vnode._parent) {
if ((component = vnode._component) && !component._processingException) {
try {
if (component.constructor && component.constructor.getDerivedStateFromError!=null) {
component.setState(component.constructor.getDerivedStateFromError(error));
}
else if (component.componentDidCatch!=null) {
component.componentDidCatch(error);
}
else {
continue;
}
return enqueueRender(component._pendingError = component);
}
catch (e) {
error = e;
}
}
}
throw error;
}