b0d79d5124
We leave css:light, text:light, id:light, and similar to opt-out from the shadow dom piercing. The notable exception is xpath that is always light.
75 lines
2.7 KiB
TypeScript
75 lines
2.7 KiB
TypeScript
/**
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* Copyright (c) Microsoft Corporation.
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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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import { SelectorEngine, SelectorRoot } from './selectorEngine';
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export function createAttributeEngine(attribute: string, shadow: boolean): SelectorEngine {
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const engine: SelectorEngine = {
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create(root: SelectorRoot, target: Element): string | undefined {
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const value = target.getAttribute(attribute);
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if (!value)
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return;
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if (engine.query(root, value) === target)
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return value;
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},
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query(root: SelectorRoot, selector: string): Element | undefined {
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if (!shadow)
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return root.querySelector(`[${attribute}=${JSON.stringify(selector)}]`) || undefined;
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return queryShadowInternal(root, attribute, selector);
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},
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queryAll(root: SelectorRoot, selector: string): Element[] {
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if (!shadow)
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return Array.from(root.querySelectorAll(`[${attribute}=${JSON.stringify(selector)}]`));
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const result: Element[] = [];
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queryShadowAllInternal(root, attribute, selector, result);
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return result;
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}
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};
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return engine;
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}
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function queryShadowInternal(root: SelectorRoot, attribute: string, value: string): Element | undefined {
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const single = root.querySelector(`[${attribute}=${JSON.stringify(value)}]`);
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if (single)
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return single;
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const all = root.querySelectorAll('*');
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for (let i = 0; i < all.length; i++) {
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const shadowRoot = all[i].shadowRoot;
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if (shadowRoot) {
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const single = queryShadowInternal(shadowRoot, attribute, value);
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if (single)
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return single;
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}
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}
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}
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function queryShadowAllInternal(root: SelectorRoot, attribute: string, value: string, result: Element[]) {
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const document = root instanceof Document ? root : root.ownerDocument!;
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const walker = document.createTreeWalker(root, NodeFilter.SHOW_ELEMENT);
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const shadowRoots = [];
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while (walker.nextNode()) {
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const element = walker.currentNode as Element;
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if (element.getAttribute(attribute) === value)
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result.push(element);
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if (element.shadowRoot)
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shadowRoots.push(element.shadowRoot);
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}
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for (const shadowRoot of shadowRoots)
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queryShadowAllInternal(shadowRoot, attribute, value, result);
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}
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