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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 {assert} from '../util/assert.js';
+import {CDPSession} from './Connection.js';
+import {ElementHandle} from './ElementHandle.js';
+import {Frame} from './Frame.js';
+import {MAIN_WORLD, PageBinding, PUPPETEER_WORLD} from './IsolatedWorld.js';
+import {InternalQueryHandler} from './QueryHandler.js';
+
+async function queryAXTree(
+ client: CDPSession,
+ element: ElementHandle<Node>,
+ accessibleName?: string,
+ role?: string
+): Promise<Protocol.Accessibility.AXNode[]> {
+ const {nodes} = await client.send('Accessibility.queryAXTree', {
+ objectId: element.remoteObject().objectId,
+ accessibleName,
+ role,
+ });
+ const filteredNodes: Protocol.Accessibility.AXNode[] = nodes.filter(
+ (node: Protocol.Accessibility.AXNode) => {
+ return !node.role || node.role.value !== 'StaticText';
+ }
+ );
+ return filteredNodes;
+}
+
+const normalizeValue = (value: string): string => {
+ return value.replace(/ +/g, ' ').trim();
+};
+const knownAttributes = new Set(['name', 'role']);
+const attributeRegexp =
+ /\[\s*(?<attribute>\w+)\s*=\s*(?<quote>"|')(?<value>\\.|.*?(?=\k<quote>))\k<quote>\s*\]/g;
+
+type ARIAQueryOption = {name?: string; role?: string};
+function isKnownAttribute(
+ attribute: string
+): attribute is keyof ARIAQueryOption {
+ return knownAttributes.has(attribute);
+}
+
+/**
+ * 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'.
+ */
+function parseAriaSelector(selector: string): ARIAQueryOption {
+ const queryOptions: ARIAQueryOption = {};
+ const defaultName = selector.replace(
+ attributeRegexp,
+ (_, attribute: string, _quote: string, value: string) => {
+ 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;
+}
+
+const queryOneId = async (element: ElementHandle<Node>, selector: string) => {
+ const {name, role} = parseAriaSelector(selector);
+ const res = await queryAXTree(element.client, element, name, role);
+ if (!res[0] || !res[0].backendDOMNodeId) {
+ return null;
+ }
+ return res[0].backendDOMNodeId;
+};
+
+const queryOne: InternalQueryHandler['queryOne'] = async (
+ element,
+ selector
+) => {
+ const id = await queryOneId(element, selector);
+ if (!id) {
+ return null;
+ }
+ return (await element.frame.worlds[MAIN_WORLD].adoptBackendNode(
+ id
+ )) as ElementHandle<Node>;
+};
+
+const waitFor: InternalQueryHandler['waitFor'] = async (
+ elementOrFrame,
+ selector,
+ options
+) => {
+ let frame: Frame;
+ let element: ElementHandle<Node> | undefined;
+ if (elementOrFrame instanceof Frame) {
+ frame = elementOrFrame;
+ } else {
+ frame = elementOrFrame.frame;
+ element = await frame.worlds[PUPPETEER_WORLD].adoptHandle(elementOrFrame);
+ }
+ const binding: PageBinding = {
+ name: 'ariaQuerySelector',
+ pptrFunction: async (selector: string) => {
+ const id = await queryOneId(
+ element || (await frame.worlds[PUPPETEER_WORLD].document()),
+ selector
+ );
+ if (!id) {
+ return null;
+ }
+ return (await frame.worlds[PUPPETEER_WORLD].adoptBackendNode(
+ id
+ )) as ElementHandle<Node>;
+ },
+ };
+ const result = await frame.worlds[PUPPETEER_WORLD]._waitForSelectorInPage(
+ (_: Element, selector: string) => {
+ return (
+ globalThis as unknown as {
+ ariaQuerySelector(selector: string): Node | null;
+ }
+ ).ariaQuerySelector(selector);
+ },
+ element,
+ selector,
+ options,
+ binding
+ );
+ if (element) {
+ await element.dispose();
+ }
+ if (!result) {
+ return null;
+ }
+ if (!(result instanceof ElementHandle)) {
+ await result.dispose();
+ return null;
+ }
+ return result.frame.worlds[MAIN_WORLD].transferHandle(result);
+};
+
+const queryAll: InternalQueryHandler['queryAll'] = async (
+ element,
+ selector
+) => {
+ const exeCtx = element.executionContext();
+ const {name, role} = parseAriaSelector(selector);
+ const res = await queryAXTree(exeCtx._client, element, name, role);
+ const world = exeCtx._world!;
+ return Promise.all(
+ res.map(axNode => {
+ return world.adoptBackendNode(axNode.backendDOMNodeId) as Promise<
+ ElementHandle<Node>
+ >;
+ })
+ );
+};
+
+/**
+ * @internal
+ */
+export const ariaHandler: InternalQueryHandler = {
+ queryOne,
+ waitFor,
+ queryAll,
+};