Function registerSystem

src/core/system.js:125–155

(name, definition)

 * @param {object} definition - Component property and methods.
 */
export function registerSystem (name, definition) {
  var i;
  var NewSystem;
  var proto = {};
  var scenes = utils.findAllScenes(document);

  // Format definition object to prototype object.
  Object.keys(definition).forEach(function (key) {
    proto[key] = {
      value: definition[key],
      writable: true
    };
  });

  if (systems[name]) {
    throw new Error('The system `' + name + '` has been already registered. ' +
                    'Check that you are not loading two versions of the same system ' +
                    'or two different systems of the same name.');
  }
  NewSystem = function (sceneEl) { System.call(this, sceneEl); };
  NewSystem.prototype = Object.create(System.prototype, proto);
  NewSystem.prototype.name = name;
  NewSystem.prototype.constructor = NewSystem;
  NewSystem.prototype.schema = processSchema(NewSystem.prototype.schema);
  systems[name] = NewSystem;

  // Initialize systems for existing scenes
  if (ready.canInitializeElements) {
    for (i = 0; i < scenes.length; i++) { scenes[i].initSystem(name); }
  }
}