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