75 lines
2.3 KiB
TypeScript
75 lines
2.3 KiB
TypeScript
|
/**
|
||
|
|
* 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.
|
||
|
|
*/
|
||
|
|
|
||
|
|
export interface QueryHandler {
|
||
|
|
(element: Element | Document, selector: string): Element | Element[] | NodeListOf<Element>;
|
||
|
|
}
|
||
|
|
|
||
|
|
const _customQueryHandlers = new Map<string, QueryHandler>();
|
||
|
|
|
||
|
|
export function registerCustomQueryHandler(name: string, handler: Function): void {
|
||
|
|
if (_customQueryHandlers.get(name))
|
||
|
|
throw new Error(`A custom query handler named "${name}" already exists`);
|
||
|
|
|
||
|
|
const isValidName = /^[a-zA-Z]+$/.test(name);
|
||
|
|
if (!isValidName)
|
||
|
|
throw new Error(`Custom query handler names may only contain [a-zA-Z]`);
|
||
|
|
|
||
|
|
_customQueryHandlers.set(name, handler as QueryHandler);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @param {string} name
|
||
|
|
*/
|
||
|
|
export function unregisterCustomQueryHandler(name: string): void {
|
||
|
|
_customQueryHandlers.delete(name);
|
||
|
|
}
|
||
|
|
|
||
|
|
export function customQueryHandlers(): Map<string, QueryHandler> {
|
||
|
|
return _customQueryHandlers;
|
||
|
|
}
|
||
|
|
|
||
|
|
export function clearQueryHandlers(): void {
|
||
|
|
_customQueryHandlers.clear();
|
||
|
|
}
|
||
|
|
|
||
|
|
export function getQueryHandlerAndSelector(selector: string, defaultQueryHandler: QueryHandler):
|
||
|
|
{ updatedSelector: string; queryHandler: QueryHandler} {
|
||
|
|
const hasCustomQueryHandler = /^[a-zA-Z]+\//.test(selector);
|
||
|
|
if (!hasCustomQueryHandler)
|
||
|
|
return {updatedSelector: selector, queryHandler: defaultQueryHandler};
|
||
|
|
|
||
|
|
const index = selector.indexOf('/');
|
||
|
|
const name = selector.slice(0, index);
|
||
|
|
const updatedSelector = selector.slice(index + 1);
|
||
|
|
const queryHandler = customQueryHandlers().get(name);
|
||
|
|
if (!queryHandler)
|
||
|
|
throw new Error(`Query set to use "${name}", but no query handler of that name was found`);
|
||
|
|
|
||
|
|
return {
|
||
|
|
updatedSelector,
|
||
|
|
queryHandler
|
||
|
|
};
|
||
|
|
}
|
||
|
|
|
||
|
|
module.exports = {
|
||
|
|
registerCustomQueryHandler,
|
||
|
|
unregisterCustomQueryHandler,
|
||
|
|
customQueryHandlers,
|
||
|
|
getQueryHandlerAndSelector,
|
||
|
|
clearQueryHandlers
|
||
|
|
};
|