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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 { InternalQueryHandler } from './QueryHandler.js';
+import { ElementHandle, JSHandle } from './JSHandle.js';
+import { Protocol } from 'devtools-protocol';
+import { CDPSession } from './Connection.js';
+import { DOMWorld, PageBinding, WaitForSelectorOptions } from './DOMWorld.js';
+
+async function queryAXTree(
+ client: CDPSession,
+ element: ElementHandle,
+ 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) => node.role.value !== 'text'
+ );
+ return filteredNodes;
+}
+
+/*
+ * 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'.
+ */
+type ariaQueryOption = { name?: string; role?: string };
+function parseAriaSelector(selector: string): ariaQueryOption {
+ const normalize = (value: string): string => value.replace(/ +/g, ' ').trim();
+ const knownAttributes = new Set(['name', 'role']);
+ const queryOptions: ariaQueryOption = {};
+ const attributeRegexp = /\[\s*(?<attribute>\w+)\s*=\s*"(?<value>\\.|[^"\\]*)"\s*\]/;
+ const defaultName = selector.replace(
+ attributeRegexp,
+ (_, attribute: string, value: string) => {
+ attribute = attribute.trim();
+ if (!knownAttributes.has(attribute))
+ throw new Error(
+ 'Unkown aria attribute "${groups.attribute}" in selector'
+ );
+ queryOptions[attribute] = normalize(value);
+ return '';
+ }
+ );
+ if (defaultName && !queryOptions.name)
+ queryOptions.name = normalize(defaultName);
+ return queryOptions;
+}
+
+const queryOne = async (
+ element: ElementHandle,
+ selector: string
+): Promise<ElementHandle | null> => {
+ const exeCtx = element.executionContext();
+ const { name, role } = parseAriaSelector(selector);
+ const res = await queryAXTree(exeCtx._client, element, name, role);
+ if (res.length < 1) {
+ return null;
+ }
+ return exeCtx._adoptBackendNodeId(res[0].backendDOMNodeId);
+};
+
+const waitFor = async (
+ domWorld: DOMWorld,
+ selector: string,
+ options: WaitForSelectorOptions
+): Promise<ElementHandle<Element>> => {
+ const binding: PageBinding = {
+ name: 'ariaQuerySelector',
+ pptrFunction: async (selector: string) => {
+ const document = await domWorld._document();
+ const element = await queryOne(document, selector);
+ return element;
+ },
+ };
+ return domWorld.waitForSelectorInPage(
+ (_: Element, selector: string) => globalThis.ariaQuerySelector(selector),
+ selector,
+ options,
+ binding
+ );
+};
+
+const queryAll = async (
+ element: ElementHandle,
+ selector: string
+): Promise<ElementHandle[]> => {
+ const exeCtx = element.executionContext();
+ const { name, role } = parseAriaSelector(selector);
+ const res = await queryAXTree(exeCtx._client, element, name, role);
+ return Promise.all(
+ res.map((axNode) => exeCtx._adoptBackendNodeId(axNode.backendDOMNodeId))
+ );
+};
+
+const queryAllArray = async (
+ element: ElementHandle,
+ selector: string
+): Promise<JSHandle> => {
+ const elementHandles = await queryAll(element, selector);
+ const exeCtx = element.executionContext();
+ const jsHandle = exeCtx.evaluateHandle(
+ (...elements) => elements,
+ ...elementHandles
+ );
+ return jsHandle;
+};
+
+/**
+ * @internal
+ */
+export const ariaHandler: InternalQueryHandler = {
+ queryOne,
+ waitFor,
+ queryAll,
+ queryAllArray,
+};