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playwright/packages/playwright-core/src/client/jsHandle.ts

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/**
* Copyright (c) Microsoft Corporation.
*
* 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.
*/
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import type * as channels from '../protocol/channels';
import { ChannelOwner } from './channelOwner';
import { parseSerializedValue, serializeValue } from '../protocol/serializers';
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import type * as api from '../../types/types';
import type * as structs from '../../types/structs';
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export class JSHandle<T = any> extends ChannelOwner<channels.JSHandleChannel> implements api.JSHandle {
private _preview: string;
static from(handle: channels.JSHandleChannel): JSHandle {
return (handle as any)._object;
}
constructor(parent: ChannelOwner, type: string, guid: string, initializer: channels.JSHandleInitializer) {
super(parent, type, guid, initializer);
this._preview = this._initializer.preview;
this._channel.on('previewUpdated', ({ preview }) => this._preview = preview);
}
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) });
return parseResult(result.value);
}
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) });
return JSHandle.from(result.handle) as any as structs.SmartHandle<R>;
}
async getProperty(propertyName: string): Promise<JSHandle> {
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const result = await this._channel.getProperty({ name: propertyName });
return JSHandle.from(result.handle);
}
async getProperties(): Promise<Map<string, JSHandle>> {
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const map = new Map<string, JSHandle>();
for (const { name, value } of (await this._channel.getPropertyList()).properties)
map.set(name, JSHandle.from(value));
return map;
}
async jsonValue(): Promise<T> {
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return parseResult((await this._channel.jsonValue()).value);
}
asElement(): T extends Node ? api.ElementHandle<T> : null {
return null as any;
}
async dispose() {
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return await this._channel.dispose();
}
override toString(): string {
return this._preview;
}
}
// This function takes care of converting all JSHandles to their channels,
// so that generic channel serializer converts them to guids.
export function serializeArgument(arg: any): channels.SerializedArgument {
const handles: channels.Channel[] = [];
const pushHandle = (channel: channels.Channel): number => {
handles.push(channel);
return handles.length - 1;
};
const value = serializeValue(arg, value => {
if (value instanceof JSHandle)
return { h: pushHandle(value._channel) };
return { fallThrough: value };
});
return { value, handles };
}
export function parseResult(value: channels.SerializedValue): any {
return parseSerializedValue(value, undefined);
}
export function assertMaxArguments(count: number, max: number): asserts count {
if (count > max)
throw new Error('Too many arguments. If you need to pass more than 1 argument to the function wrap them in an object.');
}