source: node_modules/autolinker/dist/es2015/truncate/truncate-middle.js@ d24f17c

/**
 * Date: 2015-10-05
 * Author: Kasper Søfren <soefritz@gmail.com> (https://github.com/kafoso)
 *
 * A truncation feature, where the ellipsis will be placed in the dead-center of the URL.
 *
 * @param {String} url             A URL.
 * @param {Number} truncateLen     The maximum length of the truncated output URL string.
 * @param {String} ellipsisChars   The characters to place within the url, e.g. "..".
 * @return {String} The truncated URL.
 */
export function truncateMiddle(url, truncateLen, ellipsisChars) {
    if (url.length <= truncateLen) {
        return url;
    }
    var ellipsisLengthBeforeParsing;
    var ellipsisLength;
    if (ellipsisChars == null) {
        ellipsisChars = '&hellip;';
        ellipsisLengthBeforeParsing = 8;
        ellipsisLength = 3;
    }
    else {
        ellipsisLengthBeforeParsing = ellipsisChars.length;
        ellipsisLength = ellipsisChars.length;
    }
    var availableLength = truncateLen - ellipsisLength;
    var end = '';
    if (availableLength > 0) {
        end = url.substr(-1 * Math.floor(availableLength / 2));
    }
    return (url.substr(0, Math.ceil(availableLength / 2)) + ellipsisChars + end).substr(0, availableLength + ellipsisLengthBeforeParsing);
}
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