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/**
* @license
* Copyright 2023 Google Inc.
* SPDX-License-Identifier: Apache-2.0
*/
import type {CustomQueryHandler} from '../common/CustomQueryHandler.js';
import type {Awaitable, AwaitableIterable} from '../common/types.js';
export interface CustomQuerySelector {
querySelector(root: Node, selector: string): Awaitable<Node | null>;
querySelectorAll(root: Node, selector: string): AwaitableIterable<Node>;
}
/**
* This class mimics the injected {@link CustomQuerySelectorRegistry}.
*/
class CustomQuerySelectorRegistry {
#selectors = new Map<string, CustomQuerySelector>();
register(name: string, handler: CustomQueryHandler): void {
if (!handler.queryOne && handler.queryAll) {
const querySelectorAll = handler.queryAll;
handler.queryOne = (node, selector) => {
for (const result of querySelectorAll(node, selector)) {
return result;
}
return null;
};
} else if (handler.queryOne && !handler.queryAll) {
const querySelector = handler.queryOne;
handler.queryAll = (node, selector) => {
const result = querySelector(node, selector);
return result ? [result] : [];
};
} else if (!handler.queryOne || !handler.queryAll) {
throw new Error('At least one query method must be defined.');
}
this.#selectors.set(name, {
querySelector: handler.queryOne,
querySelectorAll: handler.queryAll!,
});
}
unregister(name: string): void {
this.#selectors.delete(name);
}
get(name: string): CustomQuerySelector | undefined {
return this.#selectors.get(name);
}
clear() {
this.#selectors.clear();
}
}
export const customQuerySelectors = new CustomQuerySelectorRegistry();
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