85 lines
2.4 KiB
TypeScript
85 lines
2.4 KiB
TypeScript
/**
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* Copyright 2020 Google Inc. All rights reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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export interface QueryHandler {
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(element: Element | Document, selector: string):
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| Element
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| Element[]
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| NodeListOf<Element>;
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}
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const _customQueryHandlers = new Map<string, QueryHandler>();
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export function registerCustomQueryHandler(
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name: string,
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handler: Function
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): void {
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if (_customQueryHandlers.get(name))
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throw new Error(`A custom query handler named "${name}" already exists`);
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const isValidName = /^[a-zA-Z]+$/.test(name);
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if (!isValidName)
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throw new Error(`Custom query handler names may only contain [a-zA-Z]`);
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_customQueryHandlers.set(name, handler as QueryHandler);
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}
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/**
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* @param {string} name
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*/
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export function unregisterCustomQueryHandler(name: string): void {
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_customQueryHandlers.delete(name);
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}
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export function customQueryHandlers(): Map<string, QueryHandler> {
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return _customQueryHandlers;
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}
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export function clearQueryHandlers(): void {
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_customQueryHandlers.clear();
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}
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export function getQueryHandlerAndSelector(
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selector: string,
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defaultQueryHandler: QueryHandler
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): { updatedSelector: string; queryHandler: QueryHandler } {
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const hasCustomQueryHandler = /^[a-zA-Z]+\//.test(selector);
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if (!hasCustomQueryHandler)
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return { updatedSelector: selector, queryHandler: defaultQueryHandler };
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const index = selector.indexOf('/');
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const name = selector.slice(0, index);
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const updatedSelector = selector.slice(index + 1);
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const queryHandler = customQueryHandlers().get(name);
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if (!queryHandler)
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throw new Error(
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`Query set to use "${name}", but no query handler of that name was found`
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);
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return {
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updatedSelector,
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queryHandler,
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};
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}
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module.exports = {
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registerCustomQueryHandler,
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unregisterCustomQueryHandler,
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customQueryHandlers,
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getQueryHandlerAndSelector,
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clearQueryHandlers,
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};
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