/**
 * @license
 * Copyright Google LLC 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, ngContentSelectors) {
    const nodes = host.childNodes;
    const projectableNodes = 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, selectors, defaultIndex) {
    let matchingIndex = defaultIndex;
    if (isElement(node)) {
        selectors.some((selector, i) => {
            if ((selector !== '*') && matchesSelector(node, selector)) {
                matchingIndex = i;
                return true;
            }
            return false;
        });
    }
    return matchingIndex;
}
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