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/** * @license * Copyright 2020 Google Inc. * SPDX-License-Identifier: Apache-2.0 */ import type {ElementHandle} from '../api/ElementHandle.js'; import {QueryHandler, type QuerySelector} from '../common/QueryHandler.js'; import type {AwaitableIterable} from '../common/types.js'; import {assert} from '../util/assert.js'; import {AsyncIterableUtil} from '../util/AsyncIterableUtil.js'; interface ARIASelector { name?: string; role?: string; } const isKnownAttribute = ( attribute: string ): attribute is keyof ARIASelector => { return ['name', 'role'].includes(attribute); }; const normalizeValue = (value: string): string => { return value.replace(/ +/g, ' ').trim(); }; /** * The selectors consist of an accessible name to query for and optionally * further aria attributes on the form `[<attribute>=<value>]`. * Currently, we only support the `name` and `role` attribute. * The following examples showcase how the syntax works wrt. querying: * * - 'title[role="heading"]' queries for elements with name 'title' and role 'heading'. * - '[role="image"]' queries for elements with role 'image' and any name. * - 'label' queries for elements with name 'label' and any role. * - '[name=""][role="button"]' queries for elements with no name and role 'button'. */ const ATTRIBUTE_REGEXP = /\[\s*(?<attribute>\w+)\s*=\s*(?<quote>"|')(?<value>\\.|.*?(?=\k<quote>))\k<quote>\s*\]/g; const parseARIASelector = (selector: string): ARIASelector => { const queryOptions: ARIASelector = {}; const defaultName = selector.replace( ATTRIBUTE_REGEXP, (_, attribute, __, value) => { attribute = attribute.trim(); assert( isKnownAttribute(attribute), `Unknown aria attribute "${attribute}" in selector` ); queryOptions[attribute] = normalizeValue(value); return ''; } ); if (defaultName && !queryOptions.name) { queryOptions.name = normalizeValue(defaultName); } return queryOptions; }; /** * @internal */ export class ARIAQueryHandler extends QueryHandler { static override querySelector: QuerySelector = async ( node, selector, {ariaQuerySelector} ) => { return await ariaQuerySelector(node, selector); }; static override async *queryAll( element: ElementHandle<Node>, selector: string ): AwaitableIterable<ElementHandle<Node>> { const {name, role} = parseARIASelector(selector); yield* element.queryAXTree(name, role); } static override queryOne = async ( element: ElementHandle<Node>, selector: string ): Promise<ElementHandle<Node> | null> => { return ( (await AsyncIterableUtil.first(this.queryAll(element, selector))) ?? null ); }; }
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