(function() {

const UPLEVEL_STRING = "../";
const MAX_DEPTH = 10;
const INITIAL_PREFIX = "./";

function walk(prefix) {
    if (prefix.length > (MAX_DEPTH * UPLEVEL_STRING.length) + INITIAL_PREFIX.length) {
        throw new Error("Unable to find pageloader.js!");
    }
    window._rootPath = prefix;
    const script = document.createElement("script");
    script.src = prefix + "pageloader.js";
    script.onerror = function() {
        walk(prefix + UPLEVEL_STRING);
    }
    script.onload = function() {
        window._pageloaderLoaded = true;
    }
    if (window._loaded) {
        document.head.appendChild(script);
    } else {
        window.addEventListener("DOMContentLoaded", () => {
            window._loaded = true;
            document.head.appendChild(script);
        });
    }
}

const requestedPath = document.currentScript.src;
const fragmentIndex = requestedPath.indexOf("#");
if (fragmentIndex !== -1) {
    // We are being called in deferred script loader mode.
    if (!window._pageloaderLoaded) {
        // Deferred scripts encountered now should not run.
        return;
    }
    const fragment = requestedPath.replace(/[^#]*#/, "");
    const script = document.createElement("script");
    if (fragment[0] === "/") {
        // The script to be loaded has an absolute path
        script.src = window._rootPath + fragment.substring(1);
    } else {
        script.src = fragment;
    }
    document.head.appendChild(script);
} else {
    // We are being called in pageloader-loader mode
    if (window._pageloaderLoaded) {
        return;
    }
    walk(INITIAL_PREFIX);
}

})();