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57 lines
2.1 KiB
TypeScript
57 lines
2.1 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 * as dom from './dom';
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import Injected from './injected/injected';
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import { helper } from './helper';
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let selectors: Selectors;
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export class Selectors {
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readonly _engines: Map<string, string>;
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_generation = 0;
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static _instance() {
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if (!selectors)
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selectors = new Selectors();
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return selectors;
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}
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constructor() {
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this._engines = new Map();
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}
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async register(name: string, script: string | Function | { path?: string, content?: string }): Promise<void> {
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if (!name.match(/^[a-zA-Z_0-9-]+$/))
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throw new Error('Selector engine name may only contain [a-zA-Z0-9_] characters');
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// Note: keep in sync with Injected class, and also keep 'zs' for future.
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if (['css', 'xpath', 'text', 'id', 'zs', 'data-testid', 'data-test-id', 'data-test'].includes(name))
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throw new Error(`"${name}" is a predefined selector engine`);
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const source = await helper.evaluationScript(script, [], false);
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if (this._engines.has(name))
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throw new Error(`"${name}" selector engine has been already registered`);
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this._engines.set(name, source);
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++this._generation;
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}
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async _createSelector(name: string, handle: dom.ElementHandle<Element>): Promise<string | undefined> {
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const mainContext = await handle._page.mainFrame()._mainContext();
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return mainContext.evaluate((injected: Injected, target: Element, name: string) => {
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return injected.engines.get(name)!.create(document.documentElement, target);
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}, await mainContext._injected(), handle, name);
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}
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}
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