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+/**
+ * Copyright 2020 Google Inc. 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 {Protocol} from 'devtools-protocol';
+
+import {ElementHandle} from '../api/ElementHandle.js';
+import {assert} from '../util/assert.js';
+import {AsyncIterableUtil} from '../util/AsyncIterableUtil.js';
+
+import {CDPSession} from './Connection.js';
+import {QueryHandler, QuerySelector} from './QueryHandler.js';
+import {AwaitableIterable} from './types.js';
+
+const queryAXTree = async (
+ client: CDPSession,
+ element: ElementHandle<Node>,
+ accessibleName?: string,
+ role?: string
+): Promise<Protocol.Accessibility.AXNode[]> => {
+ const {nodes} = await client.send('Accessibility.queryAXTree', {
+ objectId: element.id,
+ accessibleName,
+ role,
+ });
+ return nodes.filter((node: Protocol.Accessibility.AXNode) => {
+ return !node.role || node.role.value !== 'StaticText';
+ });
+};
+
+type ARIASelector = {name?: string; role?: string};
+
+const KNOWN_ATTRIBUTES = Object.freeze(['name', 'role']);
+const isKnownAttribute = (
+ attribute: string
+): attribute is keyof ARIASelector => {
+ return KNOWN_ATTRIBUTES.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="img"]' queries for elements with role 'img' 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 ariaQuerySelector(node, selector);
+ };
+
+ static override async *queryAll(
+ element: ElementHandle<Node>,
+ selector: string
+ ): AwaitableIterable<ElementHandle<Node>> {
+ const context = element.executionContext();
+ const {name, role} = parseARIASelector(selector);
+ const results = await queryAXTree(context._client, element, name, role);
+ const world = context._world!;
+ yield* AsyncIterableUtil.map(results, node => {
+ return world.adoptBackendNode(node.backendDOMNodeId) as Promise<
+ ElementHandle<Node>
+ >;
+ });
+ }
+
+ static override queryOne = async (
+ element: ElementHandle<Node>,
+ selector: string
+ ): Promise<ElementHandle<Node> | null> => {
+ return (
+ (await AsyncIterableUtil.first(this.queryAll(element, selector))) ?? null
+ );
+ };
+}