mirror of
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99 lines
3.7 KiB
TypeScript
99 lines
3.7 KiB
TypeScript
/**
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* Copyright (c) Microsoft Corporation.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import type * as channels from '../protocol/channels';
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import { ChannelOwner } from './channelOwner';
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import { parseSerializedValue, serializeValue } from '../protocol/serializers';
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import type * as api from '../../types/types';
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import type * as structs from '../../types/structs';
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export class JSHandle<T = any> extends ChannelOwner<channels.JSHandleChannel> implements api.JSHandle {
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private _preview: string;
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static from(handle: channels.JSHandleChannel): JSHandle {
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return (handle as any)._object;
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}
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constructor(parent: ChannelOwner, type: string, guid: string, initializer: channels.JSHandleInitializer) {
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super(parent, type, guid, initializer);
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this._preview = this._initializer.preview;
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this._channel.on('previewUpdated', ({ preview }) => this._preview = preview);
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}
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async evaluate<R, Arg>(pageFunction: structs.PageFunctionOn<T, Arg, R>, arg?: Arg): Promise<R> {
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const result = await this._channel.evaluateExpression({ expression: String(pageFunction), isFunction: typeof pageFunction === 'function', arg: serializeArgument(arg) });
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return parseResult(result.value);
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}
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async evaluateHandle<R, Arg>(pageFunction: structs.PageFunctionOn<T, Arg, R>, arg?: Arg): Promise<structs.SmartHandle<R>> {
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const result = await this._channel.evaluateExpressionHandle({ expression: String(pageFunction), isFunction: typeof pageFunction === 'function', arg: serializeArgument(arg) });
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return JSHandle.from(result.handle) as any as structs.SmartHandle<R>;
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}
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async getProperty(propertyName: string): Promise<JSHandle> {
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const result = await this._channel.getProperty({ name: propertyName });
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return JSHandle.from(result.handle);
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}
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async getProperties(): Promise<Map<string, JSHandle>> {
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const map = new Map<string, JSHandle>();
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for (const { name, value } of (await this._channel.getPropertyList()).properties)
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map.set(name, JSHandle.from(value));
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return map;
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}
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async jsonValue(): Promise<T> {
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return parseResult((await this._channel.jsonValue()).value);
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}
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asElement(): T extends Node ? api.ElementHandle<T> : null {
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return null as any;
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}
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async dispose() {
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return await this._channel.dispose();
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}
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override toString(): string {
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return this._preview;
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}
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}
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// This function takes care of converting all JSHandles to their channels,
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// so that generic channel serializer converts them to guids.
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export function serializeArgument(arg: any): channels.SerializedArgument {
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const handles: channels.Channel[] = [];
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const pushHandle = (channel: channels.Channel): number => {
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handles.push(channel);
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return handles.length - 1;
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};
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const value = serializeValue(arg, value => {
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if (value instanceof JSHandle)
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return { h: pushHandle(value._channel) };
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return { fallThrough: value };
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});
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return { value, handles };
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}
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export function parseResult(value: channels.SerializedValue): any {
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return parseSerializedValue(value, undefined);
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}
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export function assertMaxArguments(count: number, max: number): asserts count {
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if (count > max)
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throw new Error('Too many arguments. If you need to pass more than 1 argument to the function wrap them in an object.');
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}
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