openrosa-xpath-evaluator/src/utils/result.js

Wrapper for browsers' XPath evaluator with added support for OpenRosa extensions.

const sortByDocumentOrder = require('./sort-by-document-order');

module.exports = { toSnapshotResult };

function toSnapshotResult(arr, resultType, singleItem) {
    if (
        resultType === XPathResult.ORDERED_NODE_ITERATOR_TYPE ||
        resultType === XPathResult.ORDERED_NODE_SNAPSHOT_TYPE
    ) {
        sortByDocumentOrder(arr);
    }

    return ((nodes) => {
        let idx = 0;
        return {
            resultType,
            singleNodeValue: singleItem || nodes[0] || null,
            snapshotLength: nodes.length,
            snapshotItem: (i) => nodes[i] || null,
            iterateNext: () => nodes[idx++] || null,
        };
    })(arr.v);
}