@openxmldev/linq-to-xml/src/transformations/ancestors.js

LINQ to XML for TypeScript

/**
 * @author Thomas Barnekow
 * @license MIT
 */
import { getAncestors, XElement } from '../internal.js';
/**
 * Returns a function that, for the elements of the source sequence passed to
 * that function, returns the concatenated sequences of ancestors of such
 * elements in reverse document order.
 *
 * If a name is provided, the resulting sequence contains only those ancestors
 * having a matching name.
 *
 * @typeParam T The type of the elements contained in the source sequence.
 * @param name The optional name used to filter the sequence of ancestors.
 * @returns A function that will return a flat sequence of ancestors in reverse
 * document order.
 */
export function ancestors(name) {
    return function (source) {
        return name !== null
            ? getManyAncestors(source, name !== null && name !== void 0 ? name : null, false)
            : XElement.emptySequence;
    };
}
/**
 * Returns a function that, for the elements of the source sequence passed to
 * that function, returns the concatenated sequences of ancestors of such
 * elements, including the elements themselves, in reverse document order.
 *
 * If a name is provided, the resulting sequence contains only those elements
 * and ancestors having a matching name.
 *
 * @param name The optional name used to filter the sequence of ancestors and
 * elements.
 * @returns A function that will return a flat sequence of ancestors, including
 * the elements, in reverse document order.
 */
export function ancestorsAndSelf(name) {
    return function (source) {
        return name !== null
            ? getManyAncestors(source, name !== null && name !== void 0 ? name : null, true)
            : XElement.emptySequence;
    };
}
function* getManyAncestors(source, name, self) {
    for (const node of source) {
        for (const ancestor of getAncestors(node, name, self)) {
            yield ancestor;
        }
    }
}
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