55 lines
1.5 KiB
TypeScript
55 lines
1.5 KiB
TypeScript
/**
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* @license
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* Copyright Google Inc. All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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// NOTE: This is a (slightly improved) version of what is used in ngUpgrade's
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// `DowngradeComponentAdapter`.
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// TODO(gkalpak): Investigate if it makes sense to share the code.
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import {isElement, matchesSelector} from './utils';
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export function extractProjectableNodes(host: HTMLElement, ngContentSelectors: string[]): Node[][] {
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const nodes = host.childNodes;
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const projectableNodes: Node[][] = ngContentSelectors.map(() => []);
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let wildcardIndex = -1;
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ngContentSelectors.some((selector, i) => {
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if (selector === '*') {
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wildcardIndex = i;
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return true;
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}
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return false;
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});
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for (let i = 0, ii = nodes.length; i < ii; ++i) {
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const node = nodes[i];
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const ngContentIndex = findMatchingIndex(node, ngContentSelectors, wildcardIndex);
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if (ngContentIndex !== -1) {
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projectableNodes[ngContentIndex].push(node);
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}
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}
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return projectableNodes;
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}
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function findMatchingIndex(node: Node, selectors: string[], defaultIndex: number): number {
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let matchingIndex = defaultIndex;
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if (isElement(node)) {
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selectors.some((selector, i) => {
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if ((selector !== '*') && matchesSelector(node, selector)) {
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matchingIndex = i;
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return true;
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}
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return false;
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});
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}
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return matchingIndex;
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}
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