-
Notifications
You must be signed in to change notification settings - Fork 151
/
MutationTransfer.ts
62 lines (55 loc) · 2.39 KB
/
MutationTransfer.ts
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
/**
* Copyright 2018 The AMP HTML Authors. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS-IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import type { MutationFromWorker } from '../transfer/Messages';
import type { Node } from './dom/Node';
import type { Document } from './dom/Document';
import type { DocumentStub } from './dom/DocumentLite';
import { consume as consumeNodes } from './nodes';
import { consume as consumeStrings } from './strings';
import { MessageType } from '../transfer/Messages';
import { TransferrableKeys } from '../transfer/TransferrableKeys';
import { Phase } from '../transfer/Phase';
import { phase, set as setPhase } from './phase';
let pending = false;
let pendingMutations: Array<number> = [];
// TODO(choumx): Change `mutation` to Array<Uint16> to prevent casting errors e.g. integer underflow, precision loss.
export function transfer(document: Document | DocumentStub, mutation: Array<number>): void {
if (phase > Phase.Initializing && document[TransferrableKeys.allowTransfer]) {
pending = true;
pendingMutations = pendingMutations.concat(mutation);
Promise.resolve().then((_) => {
if (pending) {
const nodes = new Uint16Array(
consumeNodes().reduce((acc: Array<number>, node: Node) => acc.concat(node[TransferrableKeys.creationFormat]), []),
).buffer;
const mutations = new Uint16Array(pendingMutations).buffer;
document.postMessage(
{
[TransferrableKeys.phase]: phase,
[TransferrableKeys.type]: phase === Phase.Mutating ? MessageType.MUTATE : MessageType.HYDRATE,
[TransferrableKeys.nodes]: nodes,
[TransferrableKeys.strings]: consumeStrings(),
[TransferrableKeys.mutations]: mutations,
} as MutationFromWorker,
[nodes, mutations],
);
pendingMutations = [];
pending = false;
setPhase(Phase.Mutating);
}
});
}
}