multimediaobject/src/lib/requireScript.js

Multimediaobject library

/* eslint-disable */
/*!
  * $script.js JS loader & dependency manager
  * https://github.com/ded/script.js
  * (c) Dustin Diaz 2014 | License MIT
  */
  let doc = document,
    head = doc.getElementsByTagName('head')[0],
    s = 'string',
    f = false,
    push = 'push',
    readyState = 'readyState',
    onreadystatechange = 'onreadystatechange',
    list = {},
    ids = {},
    delay = {},
    scripts = {},
    scriptpath,
    urlArgs;

  function every(ar, fn) {
    for (var i = 0, j = ar.length; i < j; ++i) if (!fn(ar[i])) return f;
    return 1;
  }
  function each(ar, fn) {
    every(ar, (el) => {
      fn(el);
      return 1;
    });
  }

  const $script = function $script(paths, idOrDone, optDone) {
    paths = paths[push] ? paths : [paths];
    let idOrDoneIsDone = idOrDone && idOrDone.call,
      done = idOrDoneIsDone ? idOrDone : optDone,
      id = idOrDoneIsDone ? paths.join('') : idOrDone,
      queue = paths.length;
    function loopFn(item) {
      return item.call ? item() : list[item];
    }
    function callback() {
      if (!--queue) {
        list[id] = 1;
        done && done();
        for (const dset in delay) {
          every(dset.split('|'), loopFn) && !each(delay[dset], loopFn) && (delay[dset] = []);
        }
      }
    }
    setTimeout(() => {
      each(paths, function loading(path, force) {
        if (path === null) return callback();

        if (!force && !/^https?:\/\//.test(path) && scriptpath) {
          path = (path.indexOf('.js') === -1) ? `${scriptpath + path}.js` : scriptpath + path;
        }

        if (scripts[path]) {
          if (id) ids[id] = 1;
          return (scripts[path] == 2) ? callback() : setTimeout(() => { loading(path, true); }, 0);
        }

        scripts[path] = 1;
        if (id) ids[id] = 1;
        create(path, callback);
      });
    }, 0);
    return $script;
  }

  function create(path, fn) {
    let el = doc.createElement('script'),
      loaded;
    el.onload = el.onerror = el[onreadystatechange] = function () {
      if ((el[readyState] && !(/^c|loade/.test(el[readyState]))) || loaded) return;
      el.onload = el[onreadystatechange] = null;
      loaded = 1;
      scripts[path] = 2;
      fn();
    };
    el.async = 1;
    el.src = urlArgs ? path + (path.indexOf('?') === -1 ? '?' : '&') + urlArgs : path;
    head.insertBefore(el, head.lastChild);
  }

  $script.get = create;

  $script.order = function (scripts, id, done) {
    (function callback(s) {
      s = scripts.shift();
      !scripts.length ? $script(s, id, done) : $script(s, callback);
    }());
  };

  $script.path = function (p) {
    scriptpath = p;
  };
  $script.urlArgs = function (str) {
    urlArgs = str;
  };
  $script.ready = function (deps, ready, req) {
    deps = deps[push] ? deps : [deps];
    const missing = [];
    !each(deps, (dep) => {
      list[dep] || missing[push](dep);
    }) && every(deps, dep => list[dep]) ?
      ready() : !(function (key) {
        delay[key] = delay[key] || [];
        delay[key][push](ready);
        req && req(missing);
      }(deps.join('|')));
    return $script;
  };

  $script.done = function (idOrDone) {
    $script([null], idOrDone);
  };

  export default $script;