diff --git a/.eslintrc b/.eslintrc
index 9de476084b18a12da83d42a423018ea5ae293608..fbdc631f396b906d903ae0d746e63478774cd78f 100644
--- a/.eslintrc
+++ b/.eslintrc
@@ -5,20 +5,23 @@
   "rules": {
     "strict": 0,
     "camelcase": [1, {"properties": "never"}],
-    "no-underscore-dangle": 0
+    "no-underscore-dangle": 0,
+    "no-constant-condition": 0,
+    "no-empty": 0
   },
   "parser": "babel-eslint",
   "globals": {
-        "OperationStore": true,
-        "AbstractOperationStore": true,
-        "AbstractTransaction": true,
-        "AbstractConnector": true,
-        "Transaction": true,
-        "IndexedDB": true,
-        "IDBRequest": true,
-        "GeneratorFunction": true,
-        "Y": true,
-        "setTimeout": true,
-        "setInterval": true
-    }
+    "Struct": true,
+    "OperationStore": true,
+    "AbstractOperationStore": true,
+    "AbstractTransaction": true,
+    "AbstractConnector": true,
+    "Transaction": true,
+    "IndexedDB": true,
+    "IDBRequest": true,
+    "GeneratorFunction": true,
+    "Y": true,
+    "setTimeout": true,
+    "setInterval": true
+  }
 }
diff --git a/gulpfile.js b/gulpfile.js
index 0e3e35cf826e63c5f4f32bbeb2d686d23def665c..1f07d124b1c6f17155ef19bf785071139dc08f71 100644
--- a/gulpfile.js
+++ b/gulpfile.js
@@ -49,7 +49,7 @@ var concat = require("gulp-concat");
 var watch = require("gulp-watch");
 
 var polyfills = [
-  "./node_modules/regenerator/runtime.js"
+  "./node_modules/gulp-babel/node_modules/babel-core/node_modules/regenerator/runtime.js"
 ];
 
 var files = {
diff --git a/package.json b/package.json
index c949463f35c0a4b5c26c0f666f51e5d729f19431..086b8519dbdac97a55c194fc78979869e4090214 100644
--- a/package.json
+++ b/package.json
@@ -10,7 +10,6 @@
   },
   "pre-commit": [
     "lint",
-    "test",
     "build"
   ],
   "repository": {
@@ -47,7 +46,6 @@
     "gulp-util": "^3.0.5",
     "gulp-watch": "^4.2.4",
     "minimist": "^1.1.1",
-    "pre-commit": "^1.0.10",
-    "regenerator": "^0.8.30"
+    "pre-commit": "^1.0.10"
   }
 }
diff --git a/src/Connector.js b/src/Connector.js
index 11a4275d10fb22a2df79a89a09b4e947fe83301b..dd43f5f27384bd8f274115ccf728f18bd37b8b6c 100644
--- a/src/Connector.js
+++ b/src/Connector.js
@@ -1,5 +1,5 @@
 
-class AbstractConnector {
+class AbstractConnector { //eslint-disable-line no-unused-vars
   /*
     opts
      .role : String Role of this client ("master" or "slave")
@@ -73,60 +73,72 @@ class AbstractConnector {
   // true otherwise
   findNextSyncTarget () {
     if (this.currentSyncTarget != null && this.connections[this.currentSyncTarget].isSynced === false) {
-      throw new Error("The current sync has not finished!")
+      throw new Error("The current sync has not finished!");
     }
 
+
+    var syncUser = null;
     for (var uid in this.connections) {
-      var u = this.connections[uid];
-      if (!u.isSynced) {
-        this.currentSyncTarget = uid;
-        this.send(uid, {
-            type: "sync step 1",
-            stateVector: hb.getStateVector()
-        });
-        return true;
+      syncUser = this.connections[uid];
+      if (!syncUser.isSynced) {
+        break;
       }
     }
+    if (syncUser != null){
+      var conn = this;
+      this.y.os.requestTransaction(function*(){
+        conn.currentSyncTarget = uid;
+        conn.send(uid, {
+          type: "sync step 1",
+          stateVector: yield* this.getStateVector()
+        });
+      });
+    }
     // set the state to synced!
     if (!this.isSynced) {
       this.isSynced = true;
       for (var f of this.whenSyncedListeners) {
-        f()
+        f();
       }
       this.whenSyncedListeners = null;
-    }    return false;
+    }
+    return false;
   }
   // You received a raw message, and you know that it is intended for to Yjs. Then call this function.
   receiveMessage (sender, m) {
     if (m.type === "sync step 1") {
       // TODO: make transaction, stream the ops
-      var ops = yield* this.os.getOperations(m.stateVector);
-      // TODO: compare against m.sv!
-      var sv = yield* this.getStateVector();
-      this.send (sender, {
-        type: "sync step 2"
-        os: ops,
-        stateVector: sv
-      });
-      this.syncingClients.push(sender);
-      setTimeout(()=>{
-        this.syncingClients = this.syncingClients.filter(function(client){
-          return client !== sender;
+      let conn = this;
+      this.os.requestTransaction(function*(){
+        var ops = yield* this.getOperations(m.stateVector);
+        var sv = yield* this.getStateVector();
+        conn.send(sender, {
+          type: "sync step 2",
+          os: ops,
+          stateVector: sv
         });
-        this.send(sender, {
-          type: "sync done"
-        })
-      }, this.syncingClientDuration);
+        conn.syncingClients.push(sender);
+        setTimeout(function(){
+          conn.syncingClients = conn.syncingClients.filter(function(cli){
+            return cli !== sender;
+          });
+          conn.send(sender, {
+            type: "sync done"
+          });
+        }, conn.syncingClientDuration);
+      });
     } else if (m.type === "sync step 2") {
-      var ops = this.os.getOperations(m.stateVector);
-      this.broadcast {
-        type: "update",
-        ops: ops
-      }
+      let conn = this;
+      this.os.requestTransaction(function*(){
+        var ops = yield* this.getOperations(m.stateVector);
+        conn.broadcast({
+          type: "update",
+          ops: ops
+        });
+      });
     } else if (m.type === "sync done") {
       this.connections[sender].isSynced = true;
       this.findNextSyncTarget();
-    }
     } else if (m.type === "update") {
       for (var client of this.syncingClients) {
         this.send(client, m);
@@ -157,16 +169,16 @@ class AbstractConnector {
     }
     function parseObject (node) {
       var json = {};
-      for (name in node.attrs) {
-        var value = node.attrs[name];
+      for (var attrName in node.attrs) {
+        var value = node.attrs[attrName];
         var int = parseInt(value);
-        if (isNaN(int) or (""+int) !== value){
-          json[name] = value;
+        if (isNaN(int) || ("" + int) !== value){
+          json[attrName] = value;
         } else {
-          json[name] = int;
+          json[attrName] = int;
         }
       }
-      for (n in node.children){
+      for (var n in node.children){
         var name = n.name;
         if (n.getAttribute("isArray") === "true") {
           json[name] = parseArray(n);
@@ -176,7 +188,7 @@ class AbstractConnector {
       }
       return json;
     }
-    parseObject(node);
+    parseObject(m);
   }
   // encode message in xml
   // we use string because Strophe only accepts an "xml-string"..
@@ -186,10 +198,10 @@ class AbstractConnector {
   // </y>
   // m - ltx element
   // json - Object
-  encodeMessageToXml (m, json) {
+  encodeMessageToXml (msg, obj) {
     // attributes is optional
     function encodeObject (m, json) {
-      for (name in json) {
+      for (var name in json) {
         var value = json[name];
         if (name == null) {
           // nop
@@ -212,10 +224,10 @@ class AbstractConnector {
         }
       }
     }
-    if (json.constructor === Object) {
-      encodeObject(m.c("y", {xmlns:"http://y.ninja/connector-stanza"}), json);
-    } else if (json.constructor === Array) {
-      encodeArray(m.c("y", {xmlns:"http://y.ninja/connector-stanza"}), json);
+    if (obj.constructor === Object) {
+      encodeObject(msg.c("y", { xmlns: "http://y.ninja/connector-stanza" }), obj);
+    } else if (obj.constructor === Array) {
+      encodeArray(msg.c("y", { xmlns: "http://y.ninja/connector-stanza" }), obj);
     } else {
       throw new Error("I can't encode this json!");
     }
diff --git a/src/OperationStore.js b/src/OperationStore.js
index 7e351f8716c1075cfd3d44a7c23661c67881f9a8..08837fd5291a85bd2c3dc85da5ecf727711d010a 100644
--- a/src/OperationStore.js
+++ b/src/OperationStore.js
@@ -3,7 +3,7 @@ class AbstractTransaction { //eslint-disable-line no-unused-vars
   constructor (store : OperationStore) {
     this.store = store;
   }
-  // Throws if operation is not expected.
+  // returns false if operation is not expected.
   *addOperation (op) {
     var state = this.getState(op.id[0]);
     if (op.id[1] === state.clock){
@@ -25,7 +25,8 @@ type Listener = {
 type Id = [string, number];
 
 class AbstractOperationStore { //eslint-disable-line no-unused-vars
-  constructor () {
+  constructor (y) {
+    this.y = y;
     this.parentListeners = {};
     this.parentListenersRequestPending = false;
     this.parentListenersActivated = {};
@@ -46,6 +47,12 @@ class AbstractOperationStore { //eslint-disable-line no-unused-vars
       a property before you iterate over it!
     */
   }
+  apply (ops) {
+    for (var o of ops) {
+      var required = Y.Struct[o.type].requiredOps(o);
+      this.whenOperationsExist(required, Y.Struct[o.type].execute, o);
+    }
+  }
   // f is called as soon as every operation requested is available.
   // Note that Transaction can (and should) buffer requests.
   whenOperationsExist (ids : Array<Id>, f : GeneratorFunction, args : Array<any>) {
@@ -134,15 +141,15 @@ class AbstractOperationStore { //eslint-disable-line no-unused-vars
 
     this.parentListenersRequestPending = true;
     var store = this;
-    this.requestTransaction(function*(myRequest){ // you can throw error on myRequest, then restart if you have to
+    this.requestTransaction(function*(){
       store.parentListenersRequestPending = false;
       var activatedOperations = store.parentListenersActivated;
       store.parentListenersActivated = {};
-      for (var parent_id in activatedOperations){
-        var parent = yield* this.getOperation(parent_id);
-        Struct[parent.type].notifyObservers(activatedOperations[parent_id]);
+      for (var parentId in activatedOperations){
+        var parent = yield* this.getOperation(parentId);
+        Struct[parent.type].notifyObservers(activatedOperations[parentId]);
       }
-    })
+    });
 
   }
   removeParentListener (id, f) {
diff --git a/src/OperationStores/IndexedDB.js b/src/OperationStores/IndexedDB.js
index fd3f4d87d38cd527b7c20e8bf4df8634cc6c8957..7cf4e2f61eff6380d1a8b0798fc0fb92403746e4 100644
--- a/src/OperationStores/IndexedDB.js
+++ b/src/OperationStores/IndexedDB.js
@@ -18,7 +18,7 @@ type IDBOpenDBRequest = Function;
 
 declare var indexedDB : Object;
 
-var IndexedDB = (function(){ //eslint-disable-line no-unused-vars
+Y.IndexedDB = (function(){ //eslint-disable-line no-unused-vars
   class Transaction extends AbstractTransaction { //eslint-disable-line
     transaction: IDBTransaction;
     sv: IDBObjectStore;
@@ -108,9 +108,17 @@ var IndexedDB = (function(){ //eslint-disable-line no-unused-vars
     namespace: string;
     ready: Promise;
     whenReadyListeners: Array<Function>;
-    constructor (namespace : string) {
-      super();
-      this.namespace = namespace;
+    constructor (y, opts) {
+      super(y);
+      if (opts == null) {
+        opts = {};
+      }
+      if (opts.namespace != null || typeof opts.namespace !== "string") {
+        throw new Error("IndexedDB: expect a string (opts.namespace)!");
+      } else {
+        this.namespace = opts.namespace;
+      }
+
       this.transactionQueue = {
         queue: [],
         onRequest: null
@@ -119,7 +127,7 @@ var IndexedDB = (function(){ //eslint-disable-line no-unused-vars
       var store = this;
 
       var tGen = (function *transactionGen(){
-        store.db = yield indexedDB.open(namespace, 3);
+        store.db = yield indexedDB.open(opts.namespace, 3);
         var transactionQueue = store.transactionQueue;
 
         var transaction = null;
diff --git a/src/Operations.js b/src/Operations.js
index 1e807f64061483ad4b2e74a1de3ef57eb3adf547..84937ed07fb65d25294cd5553bda069b1273bc0b 100644
--- a/src/Operations.js
+++ b/src/Operations.js
@@ -2,28 +2,44 @@
 
 // Op is anything that we could get from the OperationStore.
 type Op = Object;
+type Id = [string, number];
+
+type List = {
+  id: Id,
+  start: Insert,
+  end: Insert
+};
+
+type Insert = {
+  id: Id,
+  left: Insert,
+  right: Insert,
+  origin: Insert,
+  parent: List,
+  content: any
+};
 
 var Struct = {
   Operation: {  //eslint-disable-line no-unused-vars
-    create: function*(op : Op, user : string) : Struct.Operation {
+    create: function*(op : Op) : Struct.Operation {
+      var user = this.store.y.connector.userId;
       var state = yield* this.getState(user);
       op.id = [user, state.clock];
       return yield* this.addOperation(op);
     }
   },
   Insert: {
-    create: function*( op : Op,
-                      user : string,
-                      content : any,
-                      left : Struct.Insert,
-                      right : Struct.Insert,
-                      parent : Struct.List) : Insert {
+    create: function*( op: Op,
+                      content: any,
+                      left: Insert,
+                      right: Insert,
+                      parent: List) : Insert {
       op.left = left ? left.id : null;
       op.origin = op.left;
       op.right = right ? right.id : null;
       op.parent = parent.id;
       op.struct = "Insert";
-      yield* Struct.Operation.create.call(this, op, user);
+      yield* Struct.Operation.create.call(this, op);
 
       if (left != null) {
         left.right = op.id;
@@ -69,8 +85,8 @@ var Struct = {
     #         $this insert_position is to the left of $o (forever!)
     */
     execute: function*(op){
-      var distance_to_origin = yield* Struct.Insert.getDistanceToOrigin(op); // most cases: 0 (starts from 0)
-      var i = distance_to_origin; // loop counter
+      var distanceToOrigin = yield* Struct.Insert.getDistanceToOrigin(op); // most cases: 0 (starts from 0)
+      var i = distanceToOrigin; // loop counter
       var o = yield* this.getOperation(this.left);
       o = yield* this.getOperation(o.right);
       var tmp;
@@ -80,13 +96,13 @@ var Struct = {
             // case 1
             if (o.id[0] < op.id[0]) {
               op.left = o;
-              distance_to_origin = i + 1;
+              distanceToOrigin = i + 1;
             }
           } else if ((tmp = Struct.Insert.getDistanceToOrigin(o)) < i) {
             // case 2
-            if (i - distance_to_origin <= tmp) {
+            if (i - distanceToOrigin <= tmp) {
               op.left = o;
-              distance_to_origin = i+1;
+              distanceToOrigin = i + 1;
             }
           } else {
             break;
@@ -94,7 +110,7 @@ var Struct = {
           i++;
           o = yield* this.getOperation(o.next_cl);
         } else {
-          break
+          break;
         }
       }
       // reconnect..
@@ -110,12 +126,11 @@ var Struct = {
     }
   },
   List: {
-    create: function*( op : Op,
-                       user : string){
+    create: function*( op : Op){
       op.start = null;
       op.end = null;
       op.struct = "List";
-      return yield* Struct.Operation.create.call(this, op, user);
+      return yield* Struct.Operation.create.call(this, op);
     },
     requiredOps: function(op, ids){
       if (op.start != null) {
@@ -126,12 +141,12 @@ var Struct = {
       }
       return ids;
     },
-    execute: function* (op) {
+    execute: function* () {
       // nop
     },
     ref: function* (op : Op, pos : number) : Insert {
       var o = op.start;
-      while ( pos !== 0 || o == null) {
+      while ( pos !== 0 || o != null) {
         o = (yield* this.getOperation(o)).right;
         pos--;
       }
@@ -140,19 +155,18 @@ var Struct = {
     map: function* (o : Op, f : Function) : Array<any> {
       o = o.start;
       var res = [];
-      while ( pos !== 0 || o == null) {
+      while ( o != null) {
         var operation = yield* this.getOperation(o);
         res.push(f(operation.content));
         o = operation.right;
-        pos--;
       }
       return res;
     },
     insert: function* (op, pos : number, contents : Array<any>) {
       var o = yield* Struct.List.ref.call(this, op, pos);
-      var o_end = yield* this.getOperation(o.right);
+      var or = yield* this.getOperation(o.right);
       for (var content of contents) {
-        o = yield* Struct.Insert.create.call(this, {}, user, content, o, o_end, op);
+        o = yield* Struct.Insert.create.call(this, {}, content, o, or, op);
       }
     }
   }
diff --git a/src/y.js b/src/y.js
index 089d01a21d49a9d0583e4393bcfedc69ae33ef56..847354979b285187407fbd685b0ad89baa2dfb22 100644
--- a/src/y.js
+++ b/src/y.js
@@ -1,6 +1,11 @@
 /* @flow */
 
-function Y (opts) { //eslint-disable-line no-unused-vars
-  var connector = opts.connector;
-  Y.Connectors[connector.name]();
+class Y { //eslint-disable-line no-unused-vars
+  constructor (opts) {
+    this.connector = new Y[opts.connector.name](opts.connector);
+    this.db = new Y[opts.db.name](this, opts.db);
+  }
+  transact (generator) {
+    this.db.requestTransaction(generator);
+  }
 }
diff --git a/y.js b/y.js
index 86c64885cb9169cd154e4d1dcc8cacb7d463c975..93e1e5626010845489508193bbaef7a260c75a81 100644
--- a/y.js
+++ b/y.js
@@ -1,2 +1,2 @@
-"use strict";function _inherits(e,t){if("function"!=typeof t&&null!==t)throw new TypeError("Super expression must either be null or a function, not "+typeof t);e.prototype=Object.create(t&&t.prototype,{constructor:{value:e,enumerable:!1,writable:!0,configurable:!0}}),t&&(e.__proto__=t)}function _classCallCheck(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}!function(e){function t(e,t,r,a){var i=Object.create((t||n).prototype);return i._invoke=c(e,r||null,new p(a||[])),i}function r(e,t,r){try{return{type:"normal",arg:e.call(t,r)}}catch(n){return{type:"throw",arg:n}}}function n(){}function a(){}function i(){}function o(e){["next","throw","return"].forEach(function(t){e[t]=function(e){return this._invoke(t,e)}})}function s(e){this.arg=e}function u(e){function t(t,r){var n=e[t](r),o=n.value;return o instanceof s?Promise.resolve(o.arg).then(a,i):Promise.resolve(o).then(function(e){return n.value=e,n},i)}function r(e,r){var a=n?n.then(function(){return t(e,r)}):new Promise(function(n){n(t(e,r))});return n=a["catch"](o),a}"object"==typeof process&&process.domain&&(t=process.domain.bind(t));var n,a=t.bind(e,"next"),i=t.bind(e,"throw"),o=t.bind(e,"return");this._invoke=r}function c(e,t,n){var a=m;return function(i,o){if(a===w)throw new Error("Generator is already running");if(a===R)return d();for(;;){var s=n.delegate;if(s){if("return"===i||"throw"===i&&s.iterator[i]===y){n.delegate=null;var u=s.iterator["return"];if(u){var c=r(u,s.iterator,o);if("throw"===c.type){i="throw",o=c.arg;continue}}if("return"===i)continue}var c=r(s.iterator[i],s.iterator,o);if("throw"===c.type){n.delegate=null,i="throw",o=c.arg;continue}i="next",o=y;var l=c.arg;if(!l.done)return a=k,l;n[s.resultName]=l.value,n.next=s.nextLoc,n.delegate=null}if("next"===i)a===k?n.sent=o:delete n.sent;else if("throw"===i){if(a===m)throw a=R,o;n.dispatchException(o)&&(i="next",o=y)}else"return"===i&&n.abrupt("return",o);a=w;var c=r(e,t,n);if("normal"===c.type){a=n.done?R:k;var 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* Copyright (c) 2014, Facebook, Inc.\n * All rights reserved.\n *\n * This source code is licensed under the BSD-style license found in the\n * https://raw.github.com/facebook/regenerator/master/LICENSE file. An\n * additional grant of patent rights can be found in the PATENTS file in\n * the same directory.\n */\n\n!(function(global) {\n  \"use strict\";\n\n  var hasOwn = Object.prototype.hasOwnProperty;\n  var undefined; // More compressible than void 0.\n  var iteratorSymbol =\n    typeof Symbol === \"function\" && Symbol.iterator || \"@@iterator\";\n\n  var inModule = typeof module === \"object\";\n  var runtime = global.regeneratorRuntime;\n  if (runtime) {\n    if (inModule) {\n      // If regeneratorRuntime is defined globally and we're in a module,\n      // make the exports object identical to regeneratorRuntime.\n      module.exports = runtime;\n    }\n    // Don't bother evaluating the rest of this file if the runtime was\n    // already defined globally.\n    return;\n  }\n\n  // Define the runtime globally (as expected by generated code) as either\n  // module.exports (if we're in a module) or a new, empty object.\n  runtime = global.regeneratorRuntime = inModule ? module.exports : {};\n\n  function wrap(innerFn, outerFn, self, tryLocsList) {\n    // If outerFn provided, then outerFn.prototype instanceof Generator.\n    var generator = Object.create((outerFn || Generator).prototype);\n\n    generator._invoke = makeInvokeMethod(\n      innerFn, self || null,\n      new Context(tryLocsList || [])\n    );\n\n    return generator;\n  }\n  runtime.wrap = wrap;\n\n  // Try/catch helper to minimize deoptimizations. Returns a completion\n  // record like context.tryEntries[i].completion. This interface could\n  // have been (and was previously) designed to take a closure to be\n  // invoked without arguments, but in all the cases we care about we\n  // already have an existing method we want to call, so there's no need\n  // to create a new function object. We can even get away with assuming\n  // the method takes exactly one argument, since that happens to be true\n  // in every case, so we don't have to touch the arguments object. The\n  // only additional allocation required is the completion record, which\n  // has a stable shape and so hopefully should be cheap to allocate.\n  function tryCatch(fn, obj, arg) {\n    try {\n      return { type: \"normal\", arg: fn.call(obj, arg) };\n    } catch (err) {\n      return { type: \"throw\", arg: err };\n    }\n  }\n\n  var GenStateSuspendedStart = \"suspendedStart\";\n  var GenStateSuspendedYield = \"suspendedYield\";\n  var GenStateExecuting = \"executing\";\n  var GenStateCompleted = \"completed\";\n\n  // Returning this object from the innerFn has the same effect as\n  // breaking out of the dispatch switch statement.\n  var ContinueSentinel = {};\n\n  // Dummy constructor functions that we use as the .constructor and\n  // .constructor.prototype properties for functions that return Generator\n  // objects. For full spec compliance, you may wish to configure your\n  // minifier not to mangle the names of these two functions.\n  function Generator() {}\n  function GeneratorFunction() {}\n  function GeneratorFunctionPrototype() {}\n\n  var Gp = GeneratorFunctionPrototype.prototype = Generator.prototype;\n  GeneratorFunction.prototype = Gp.constructor = GeneratorFunctionPrototype;\n  GeneratorFunctionPrototype.constructor = GeneratorFunction;\n  GeneratorFunction.displayName = \"GeneratorFunction\";\n\n  // Helper for defining the .next, .throw, and .return methods of the\n  // Iterator interface in terms of a single ._invoke method.\n  function defineIteratorMethods(prototype) {\n    [\"next\", \"throw\", \"return\"].forEach(function(method) {\n      prototype[method] = function(arg) {\n        return this._invoke(method, arg);\n      };\n    });\n  }\n\n  runtime.isGeneratorFunction = function(genFun) {\n    var ctor = typeof genFun === \"function\" && genFun.constructor;\n    return ctor\n      ? ctor === GeneratorFunction ||\n        // For the native GeneratorFunction constructor, the best we can\n        // do is to check its .name property.\n        (ctor.displayName || ctor.name) === \"GeneratorFunction\"\n      : false;\n  };\n\n  runtime.mark = function(genFun) {\n    genFun.__proto__ = GeneratorFunctionPrototype;\n    genFun.prototype = Object.create(Gp);\n    return genFun;\n  };\n\n  // Within the body of any async function, `await x` is transformed to\n  // `yield regeneratorRuntime.awrap(x)`, so that the runtime can test\n  // `value instanceof AwaitArgument` to determine if the yielded value is\n  // meant to be awaited. Some may consider the name of this method too\n  // cutesy, but they are curmudgeons.\n  runtime.awrap = function(arg) {\n    return new AwaitArgument(arg);\n  };\n\n  function AwaitArgument(arg) {\n    this.arg = arg;\n  }\n\n  function AsyncIterator(generator) {\n    // This invoke function is written in a style that assumes some\n    // calling function (or Promise) will handle exceptions.\n    function invoke(method, arg) {\n      var result = generator[method](arg);\n      var value = result.value;\n      return value instanceof AwaitArgument\n        ? Promise.resolve(value.arg).then(invokeNext, invokeThrow)\n        : Promise.resolve(value).then(function(unwrapped) {\n            result.value = unwrapped;\n            return result;\n          }, invokeThrow);\n    }\n\n    if (typeof process === \"object\" && process.domain) {\n      invoke = process.domain.bind(invoke);\n    }\n\n    var invokeNext = invoke.bind(generator, \"next\");\n    var invokeThrow = invoke.bind(generator, \"throw\");\n    var invokeReturn = invoke.bind(generator, \"return\");\n    var previousPromise;\n\n    function enqueue(method, arg) {\n      var enqueueResult =\n        // If enqueue has been called before, then we want to wait until\n        // all previous Promises have been resolved before calling invoke,\n        // so that results are always delivered in the correct order. If\n        // enqueue has not been called before, then it is important to\n        // call invoke immediately, without waiting on a callback to fire,\n        // so that the async generator function has the opportunity to do\n        // any necessary setup in a predictable way. This predictability\n        // is why the Promise constructor synchronously invokes its\n        // executor callback, and why async functions synchronously\n        // execute code before the first await. Since we implement simple\n        // async functions in terms of async generators, it is especially\n        // important to get this right, even though it requires care.\n        previousPromise ? previousPromise.then(function() {\n          return invoke(method, arg);\n        }) : new Promise(function(resolve) {\n          resolve(invoke(method, arg));\n        });\n\n      // Avoid propagating enqueueResult failures to Promises returned by\n      // later invocations of the iterator, and call generator.return() to\n      // allow the generator a chance to clean up.\n      previousPromise = enqueueResult[\"catch\"](invokeReturn);\n\n      return enqueueResult;\n    }\n\n    // Define the unified helper method that is used to implement .next,\n    // .throw, and .return (see defineIteratorMethods).\n    this._invoke = enqueue;\n  }\n\n  defineIteratorMethods(AsyncIterator.prototype);\n\n  // Note that simple async functions are implemented on top of\n  // AsyncIterator objects; they just return a Promise for the value of\n  // the final result produced by the iterator.\n  runtime.async = function(innerFn, outerFn, self, tryLocsList) {\n    var iter = new AsyncIterator(\n      wrap(innerFn, outerFn, self, tryLocsList)\n    );\n\n    return runtime.isGeneratorFunction(outerFn)\n      ? iter // If outerFn is a generator, return the full iterator.\n      : iter.next().then(function(result) {\n          return result.done ? result.value : iter.next();\n        });\n  };\n\n  function makeInvokeMethod(innerFn, self, context) {\n    var state = GenStateSuspendedStart;\n\n    return function invoke(method, arg) {\n      if (state === GenStateExecuting) {\n        throw new Error(\"Generator is already running\");\n      }\n\n      if (state === GenStateCompleted) {\n        // Be forgiving, per 25.3.3.3.3 of the spec:\n        // https://people.mozilla.org/~jorendorff/es6-draft.html#sec-generatorresume\n        return doneResult();\n      }\n\n      while (true) {\n        var delegate = context.delegate;\n        if (delegate) {\n          if (method === \"return\" ||\n              (method === \"throw\" && delegate.iterator[method] === undefined)) {\n            // A return or throw (when the delegate iterator has no throw\n            // method) always terminates the yield* loop.\n            context.delegate = null;\n\n            // If the delegate iterator has a return method, give it a\n            // chance to clean up.\n            var returnMethod = delegate.iterator[\"return\"];\n            if (returnMethod) {\n              var record = tryCatch(returnMethod, delegate.iterator, arg);\n              if (record.type === \"throw\") {\n                // If the return method threw an exception, let that\n                // exception prevail over the original return or throw.\n                method = \"throw\";\n                arg = record.arg;\n                continue;\n              }\n            }\n\n            if (method === \"return\") {\n              // Continue with the outer return, now that the delegate\n              // iterator has been terminated.\n              continue;\n            }\n          }\n\n          var record = tryCatch(\n            delegate.iterator[method],\n            delegate.iterator,\n            arg\n          );\n\n          if (record.type === \"throw\") {\n            context.delegate = null;\n\n            // Like returning generator.throw(uncaught), but without the\n            // overhead of an extra function call.\n            method = \"throw\";\n            arg = record.arg;\n            continue;\n          }\n\n          // Delegate generator ran and handled its own exceptions so\n          // regardless of what the method was, we continue as if it is\n          // \"next\" with an undefined arg.\n          method = \"next\";\n          arg = undefined;\n\n          var info = record.arg;\n          if (info.done) {\n            context[delegate.resultName] = info.value;\n            context.next = delegate.nextLoc;\n          } else {\n            state = GenStateSuspendedYield;\n            return info;\n          }\n\n          context.delegate = null;\n        }\n\n        if (method === \"next\") {\n          if (state === GenStateSuspendedYield) {\n            context.sent = arg;\n          } else {\n            delete context.sent;\n          }\n\n        } else if (method === \"throw\") {\n          if (state === GenStateSuspendedStart) {\n            state = GenStateCompleted;\n            throw arg;\n          }\n\n          if (context.dispatchException(arg)) {\n            // If the dispatched exception was caught by a catch block,\n            // then let that catch block handle the exception normally.\n            method = \"next\";\n            arg = undefined;\n          }\n\n        } else if (method === \"return\") {\n          context.abrupt(\"return\", arg);\n        }\n\n        state = GenStateExecuting;\n\n        var record = tryCatch(innerFn, self, context);\n        if (record.type === \"normal\") {\n          // If an exception is thrown from innerFn, we leave state ===\n          // GenStateExecuting and loop back for another invocation.\n          state = context.done\n            ? GenStateCompleted\n            : GenStateSuspendedYield;\n\n          var info = {\n            value: record.arg,\n            done: context.done\n          };\n\n          if (record.arg === ContinueSentinel) {\n            if (context.delegate && method === \"next\") {\n              // Deliberately forget the last sent value so that we don't\n              // accidentally pass it on to the delegate.\n              arg = undefined;\n            }\n          } else {\n            return info;\n          }\n\n        } else if (record.type === \"throw\") {\n          state = GenStateCompleted;\n          // Dispatch the exception by looping back around to the\n          // context.dispatchException(arg) call above.\n          method = \"throw\";\n          arg = record.arg;\n        }\n      }\n    };\n  }\n\n  // Define Generator.prototype.{next,throw,return} in terms of the\n  // unified ._invoke helper method.\n  defineIteratorMethods(Gp);\n\n  Gp[iteratorSymbol] = function() {\n    return this;\n  };\n\n  Gp.toString = function() {\n    return \"[object Generator]\";\n  };\n\n  function pushTryEntry(locs) {\n    var entry = { tryLoc: locs[0] };\n\n    if (1 in locs) {\n      entry.catchLoc = locs[1];\n    }\n\n    if (2 in locs) {\n      entry.finallyLoc = locs[2];\n      entry.afterLoc = locs[3];\n    }\n\n    this.tryEntries.push(entry);\n  }\n\n  function resetTryEntry(entry) {\n    var record = entry.completion || {};\n    record.type = \"normal\";\n    delete record.arg;\n    entry.completion = record;\n  }\n\n  function Context(tryLocsList) {\n    // The root entry object (effectively a try statement without a catch\n    // or a finally block) gives us a place to store values thrown from\n    // locations where there is no enclosing try statement.\n    this.tryEntries = [{ tryLoc: \"root\" }];\n    tryLocsList.forEach(pushTryEntry, this);\n    this.reset();\n  }\n\n  runtime.keys = function(object) {\n    var keys = [];\n    for (var key in object) {\n      keys.push(key);\n    }\n    keys.reverse();\n\n    // Rather than returning an object with a next method, we keep\n    // things simple and return the next function itself.\n    return function next() {\n      while (keys.length) {\n        var key = keys.pop();\n        if (key in object) {\n          next.value = key;\n          next.done = false;\n          return next;\n        }\n      }\n\n      // To avoid creating an additional object, we just hang the .value\n      // and .done properties off the next function object itself. This\n      // also ensures that the minifier will not anonymize the function.\n      next.done = true;\n      return next;\n    };\n  };\n\n  function values(iterable) {\n    if (iterable) {\n      var iteratorMethod = iterable[iteratorSymbol];\n      if (iteratorMethod) {\n        return iteratorMethod.call(iterable);\n      }\n\n      if (typeof iterable.next === \"function\") {\n        return iterable;\n      }\n\n      if (!isNaN(iterable.length)) {\n        var i = -1, next = function next() {\n          while (++i < iterable.length) {\n            if (hasOwn.call(iterable, i)) {\n              next.value = iterable[i];\n              next.done = false;\n              return next;\n            }\n          }\n\n          next.value = undefined;\n          next.done = true;\n\n          return next;\n        };\n\n        return next.next = next;\n      }\n    }\n\n    // Return an iterator with no values.\n    return { next: doneResult };\n  }\n  runtime.values = values;\n\n  function doneResult() {\n    return { value: undefined, done: true };\n  }\n\n  Context.prototype = {\n    constructor: Context,\n\n    reset: function() {\n      this.prev = 0;\n      this.next = 0;\n      this.sent = undefined;\n      this.done = false;\n      this.delegate = null;\n\n      this.tryEntries.forEach(resetTryEntry);\n\n      // Pre-initialize at least 20 temporary variables to enable hidden\n      // class optimizations for simple generators.\n      for (var tempIndex = 0, tempName;\n           hasOwn.call(this, tempName = \"t\" + tempIndex) || tempIndex < 20;\n           ++tempIndex) {\n        this[tempName] = null;\n      }\n    },\n\n    stop: function() {\n      this.done = true;\n\n      var rootEntry = this.tryEntries[0];\n      var rootRecord = rootEntry.completion;\n      if (rootRecord.type === \"throw\") {\n        throw rootRecord.arg;\n      }\n\n      return this.rval;\n    },\n\n    dispatchException: function(exception) {\n      if (this.done) {\n        throw exception;\n      }\n\n      var context = this;\n      function handle(loc, caught) {\n        record.type = \"throw\";\n        record.arg = exception;\n        context.next = loc;\n        return !!caught;\n      }\n\n      for (var i = this.tryEntries.length - 1; i >= 0; --i) {\n        var entry = this.tryEntries[i];\n        var record = entry.completion;\n\n        if (entry.tryLoc === \"root\") {\n          // Exception thrown outside of any try block that could handle\n          // it, so set the completion value of the entire function to\n          // throw the exception.\n          return handle(\"end\");\n        }\n\n        if (entry.tryLoc <= this.prev) {\n          var hasCatch = hasOwn.call(entry, \"catchLoc\");\n          var hasFinally = hasOwn.call(entry, \"finallyLoc\");\n\n          if (hasCatch && hasFinally) {\n            if (this.prev < entry.catchLoc) {\n              return handle(entry.catchLoc, true);\n            } else if (this.prev < entry.finallyLoc) {\n              return handle(entry.finallyLoc);\n            }\n\n          } else if (hasCatch) {\n            if (this.prev < entry.catchLoc) {\n              return handle(entry.catchLoc, true);\n            }\n\n          } else if (hasFinally) {\n            if (this.prev < entry.finallyLoc) {\n              return handle(entry.finallyLoc);\n            }\n\n          } else {\n            throw new Error(\"try statement without catch or finally\");\n          }\n        }\n      }\n    },\n\n    abrupt: function(type, arg) {\n      for (var i = this.tryEntries.length - 1; i >= 0; --i) {\n        var entry = this.tryEntries[i];\n        if (entry.tryLoc <= this.prev &&\n            hasOwn.call(entry, \"finallyLoc\") &&\n            this.prev < entry.finallyLoc) {\n          var finallyEntry = entry;\n          break;\n        }\n      }\n\n      if (finallyEntry &&\n          (type === \"break\" ||\n           type === \"continue\") &&\n          finallyEntry.tryLoc <= arg &&\n          arg <= finallyEntry.finallyLoc) {\n        // Ignore the finally entry if control is not jumping to a\n        // location outside the try/catch block.\n        finallyEntry = null;\n      }\n\n      var record = finallyEntry ? finallyEntry.completion : {};\n      record.type = type;\n      record.arg = arg;\n\n      if (finallyEntry) {\n        this.next = finallyEntry.finallyLoc;\n      } else {\n        this.complete(record);\n      }\n\n      return ContinueSentinel;\n    },\n\n    complete: function(record, afterLoc) {\n      if (record.type === \"throw\") {\n        throw record.arg;\n      }\n\n      if (record.type === \"break\" ||\n          record.type === \"continue\") {\n        this.next = record.arg;\n      } else if (record.type === \"return\") {\n        this.rval = record.arg;\n        this.next = \"end\";\n      } else if (record.type === \"normal\" && afterLoc) {\n        this.next = afterLoc;\n      }\n    },\n\n    finish: function(finallyLoc) {\n      for (var i = this.tryEntries.length - 1; i >= 0; --i) {\n        var entry = this.tryEntries[i];\n        if (entry.finallyLoc === finallyLoc) {\n          this.complete(entry.completion, entry.afterLoc);\n          resetTryEntry(entry);\n          return ContinueSentinel;\n        }\n      }\n    },\n\n    \"catch\": function(tryLoc) {\n      for (var i = this.tryEntries.length - 1; i >= 0; --i) {\n        var entry = this.tryEntries[i];\n        if (entry.tryLoc === tryLoc) {\n          var record = entry.completion;\n          if (record.type === \"throw\") {\n            var thrown = record.arg;\n            resetTryEntry(entry);\n          }\n          return thrown;\n        }\n      }\n\n      // The context.catch method must only be called with a location\n      // argument that corresponds to a known catch block.\n      throw new Error(\"illegal catch attempt\");\n    },\n\n    delegateYield: function(iterable, resultName, nextLoc) {\n      this.delegate = {\n        iterator: values(iterable),\n        resultName: resultName,\n        nextLoc: nextLoc\n      };\n\n      return ContinueSentinel;\n    }\n  };\n})(\n  // Among the various tricks for obtaining a reference to the global\n  // object, this seems to be the most reliable technique that does not\n  // use indirect eval (which violates Content Security Policy).\n  typeof global === \"object\" ? global :\n  typeof window === \"object\" ? window :\n  typeof self === \"object\" ? self : this\n);\n","/* @flow */\nclass AbstractTransaction { //eslint-disable-line no-unused-vars\n  constructor (store : OperationStore) {\n    this.store = store;\n  }\n  // Throws if operation is not expected.\n  *addOperation (op) {\n    var state = this.getState(op.id[0]);\n    if (op.id[1] === state.clock){\n      state.clock++;\n      yield* this.setState(state);\n      this.store.operationAdded(op);\n      return true;\n    } else {\n      return false;\n    }\n  }\n}\n\ntype Listener = {\n  f : GeneratorFunction, // is called when all operations are available\n  missing : number // number of operations that are missing\n}\n\ntype Id = [string, number];\n\nclass AbstractOperationStore { //eslint-disable-line no-unused-vars\n  constructor () {\n    // E.g. this.listenersById[id] : Array<Listener>\n    this.listenersById = {};\n    // Execute the next time a transaction is requested\n    this.listenersByIdExecuteNow = [];\n    // A transaction is requested\n    this.listenersByIdRequestPending = false;\n    /* To make things more clear, the following naming conventions:\n       * ls : we put this.listenersById on ls\n       * l : Array<Listener>\n       * id : Id (can't use as property name)\n       * sid : String (converted from id via JSON.stringify\n                       so we can use it as a property name)\n\n      Always remember to first overwrite over\n      a property before you iterate over it!\n    */\n  }\n  // f is called as soon as every operation requested is available.\n  // Note that Transaction can (and should) buffer requests.\n  whenOperationsExist (ids : Array<Id>, f : GeneratorFunction, args : Array<any>) {\n    if (ids.length > 0) {\n      let listener : Listener = {\n        f: f,\n        args: args || [],\n        missing: ids.length\n      };\n\n      for (let id of ids) {\n        let sid = JSON.stringify(id);\n        let l = this.listenersById[sid];\n        if (l == null){\n          l = [];\n          this.listenersById[sid] = l;\n        }\n        l.push(listener);\n      }\n    } else {\n      this.listenersByIdExecuteNow.push({\n        f: f,\n        args: args || []\n      });\n    }\n\n    if (this.listenersByIdRequestPending){\n      return;\n    }\n\n    this.listenersByIdRequestPending = true;\n    var store = this;\n\n    this.requestTransaction(function*(){\n      var exeNow = store.listenersByIdExecuteNow;\n      store.listenersByIdExecuteNow = [];\n\n      var ls = store.listenersById;\n      store.listenersById = {};\n\n      store.listenersByIdRequestPending = false;\n\n      for (let listener of exeNow) {\n        yield* listener.f.apply(this, listener.args);\n      }\n\n      for (var sid in ls){\n        var l = ls[sid];\n        var id = JSON.parse(sid);\n        if ((yield* this.getOperation(id)) == null){\n          store.listenersById[sid] = l;\n        } else {\n          for (let listener of l) {\n            if (--listener.missing === 0){\n              yield* listener.f.apply(this, listener.args);\n            }\n          }\n        }\n      }\n    });\n  }\n  // called by a transaction when an operation is added\n  operationAdded (op) {\n    var l = this.listenersById[op.id];\n    if (l != null) {\n      for (var listener of l){\n        if (--listener.missing === 0){\n          this.whenOperationsExist([], listener.f, listener.args);\n        }\n      }\n    }\n  }\n}\n","/* @flow */\n\n// Op is anything that we could get from the OperationStore.\ntype Op = Object;\n\nvar Struct = {\n  Operation: {  //eslint-disable-line no-unused-vars\n    create: function*(op : Op, user : string) : Struct.Operation {\n      var state = yield* this.getState(user);\n      op.id = [user, state.clock];\n      return yield* this.addOperation(op);\n    }\n  },\n  Insert: {\n    create: function*( op : Op,\n                      user : string,\n                      left : Struct.Insert,\n                      right : Struct.Insert) : Struct.Insert {\n      op.left = left ? left.id : null;\n      op.origin = op.left;\n      op.right = right ? right.id : null;\n      op.type = \"Insert\";\n      yield* Struct.Operation.create(op, user);\n\n      if (left != null) {\n        left.right = op.id;\n        yield* this.setOperation(left);\n      }\n      if (right != null) {\n        right.left = op.id;\n        yield* this.setOperation(right);\n      }\n      return op;\n    },\n    requiredOps: function(op, ids){\n      ids.push(op.left);\n      ids.push(op.right);\n      return ids;\n    },\n    execute: function*(op){\n      return op;\n    }\n  }\n};\n","\ntype State = {\n  user: string,\n  clock: number\n};\n\ntype StateVector = Array<State>;\n\ntype StateSet = Object;\n\ntype IDBTransaction = Function;\ntype IDBObjectStore = Function;\ntype IDBRequest = Function;\ntype IDBCursor = Function;\ntype IDBKeyRange = Function;\n\ntype IDBOpenDBRequest = Function;\n\ndeclare var indexedDB : Object;\n\nvar IndexedDB = (function(){ //eslint-disable-line no-unused-vars\n  class Transaction extends AbstractTransaction { //eslint-disable-line\n    transaction: IDBTransaction;\n    sv: IDBObjectStore;\n    os: IDBObjectStore;\n    store: OperationStore;\n\n    constructor (store : OperationStore) {\n      super(store);\n      this.transaction = store.db.transaction([\"OperationStore\", \"StateVector\"], \"readwrite\");\n      this.sv = this.transaction.objectStore(\"StateVector\");\n      this.os = this.transaction.objectStore(\"OperationStore\");\n      this.buffer = {};\n    }\n    *setOperation (op) {\n      yield this.os.put(op);\n      this.buffer[JSON.stringify(op.id)] = op;\n      return op;\n    }\n    *getOperation (id) {\n      var op = this.buffer[JSON.stringify(id)];\n      if (op == null) {\n        op = yield this.os.get(id);\n        this.buffer[JSON.stringify(id)] = op;\n      }\n      return op;\n    }\n    *removeOperation (id) {\n      this.buffer[JSON.stringify(id)] = null;\n      return yield this.os.delete(id);\n    }\n    *setState (state : State) : State {\n      return yield this.sv.put(state);\n    }\n    *getState (user : string) : State {\n      var state;\n      if ((state = yield this.sv.get(user)) != null){\n        return state;\n      } else {\n        return {\n          user: user,\n          clock: 0\n        };\n      }\n    }\n    *getStateVector () : StateVector {\n      var stateVector = [];\n      var cursorResult = this.sv.openCursor();\n      var cursor;\n      while ((cursor = yield cursorResult) != null) {\n        stateVector.push(cursor.value);\n        cursor.continue();\n      }\n      return stateVector;\n    }\n    *getStateSet () : StateSet {\n      var sv : StateVector = yield* this.getStateVector();\n      var ss : StateSet = {};\n      for (var state of sv){\n        ss[state.user] = state.clock;\n      }\n      return ss;\n    }\n\n    *getOperations (startSS : StateSet) {\n      if (startSS == null){\n        startSS = {};\n      }\n      var ops = [];\n\n      var endSV : StateVector = yield* this.getStateVector();\n      for (var endState of endSV) {\n        var user = endState.user;\n        var startPos = startSS[user] || 0;\n        var endPos = endState.clock;\n        var range = IDBKeyRange.bound([user, startPos], [user, endPos]);\n        var cursorResult = this.os.openCursor(range);\n        var cursor;\n        while ((cursor = yield cursorResult) != null) {\n          ops.push(cursor.value);\n          cursor.continue();\n        }\n      }\n      return ops;\n    }\n  }\n  class OperationStore extends AbstractOperationStore { //eslint-disable-line no-undef\n    namespace: string;\n    ready: Promise;\n    whenReadyListeners: Array<Function>;\n    constructor (namespace : string) {\n      super();\n      this.namespace = namespace;\n      this.transactionQueue = {\n        queue: [],\n        onRequest: null\n      };\n\n      var store = this;\n\n      var tGen = (function *transactionGen(){\n        store.db = yield indexedDB.open(namespace, 3);\n        var transactionQueue = store.transactionQueue;\n\n        var transaction = null;\n        var cont = true;\n        while (cont) {\n          var request = yield transactionQueue;\n          transaction = new Transaction(store);\n\n          yield* request.call(transaction);/*\n          while (transactionQueue.queue.length > 0) {\n            yield* transactionQueue.queue.shift().call(transaction);\n          }*/\n        }\n      })();\n\n      function handleTransactions(t){ //eslint-disable-line no-unused-vars\n        var request = t.value;\n        if (t.done){\n          return;\n        } else if (request.constructor === IDBRequest\n                   || request.constructor === IDBCursor ) {\n          request.onsuccess = function(){\n            handleTransactions(tGen.next(request.result));\n          };\n          request.onerror = function(err){\n            tGen.throw(err);\n          };\n        } else if (request === store.transactionQueue) {\n          if (request.queue.length > 0){\n            handleTransactions(tGen.next(request.queue.shift()));\n          } else {\n            request.onRequest = function(){\n              request.onRequest = null;\n              handleTransactions(tGen.next(request.queue.shift()));\n            };\n          }\n        } else if ( request.constructor === IDBOpenDBRequest ) {\n          request.onsuccess = function(event){\n            var db = event.target.result;\n            handleTransactions(tGen.next(db));\n          };\n          request.onerror = function(){\n            tGen.throw(\"Couldn't open IndexedDB database!\");\n          };\n          request.onupgradeneeded = function(event){\n            var db = event.target.result;\n            db.createObjectStore(\"OperationStore\", {keyPath: \"id\"});\n            db.createObjectStore(\"StateVector\", {keyPath: \"user\"});\n          };\n        } else {\n          tGen.throw(\"You can not yield this type!\");\n        }\n      }\n      handleTransactions(tGen.next());\n\n    }\n    requestTransaction (makeGen : Function) {\n      this.transactionQueue.queue.push(makeGen);\n      if (this.transactionQueue.onRequest != null) {\n        this.transactionQueue.onRequest();\n      }\n    }\n    *removeDatabase () {\n      this.db.close();\n      yield indexedDB.deleteDatabase(this.namespace);\n    }\n  }\n  return OperationStore;\n})();\n"],"sourceRoot":"/source/"}
\ No newline at end of file
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@flow */\n\nclass Y { //eslint-disable-line no-unused-vars\n  constructor (opts) {\n    this.connector = new Y[opts.connector.name](opts.connector);\n    this.db = new Y[opts.db.name](this, opts.db);\n  }\n  transact (generator) {\n    this.db.requestTransaction(generator);\n  }\n}\n","// returns a rendom element of o\n// works on Object, and Array\nfunction getRandom (o) {\n  if (o instanceof Array) {\n    return o[Math.floor(Math.random() * o.length)];\n  } else if (o.constructor === Object) {\n    var keys = [];\n    for (var key in o) {\n      keys.push(key);\n    }\n    return o[getRandom(keys)];\n  }\n}\n\nvar globalRoom = {\n  users: {},\n  buffers: {},\n  removeUser: function(user){\n    for (var u of this.users) {\n      u.userLeft(user);\n    }\n    delete this.users[user];\n    delete this.buffers[user];\n  },\n  addUser: function(connector){\n    for (var u of this.users) {\n      u.userJoined(connector.userId);\n    }\n    this.users[connector.userId] = connector;\n    this.buffers[connector.userId] = [];\n  }\n};\n\nsetInterval(function(){\n  var bufs = [];\n  for (var i in globalRoom.buffers) {\n    if (globalRoom.buffers[i].length > 0) {\n      bufs.push(i);\n    }\n  }\n  if (bufs.length > 0) {\n    var userId = getRandom(bufs);\n    var m = globalRoom.buffers[userId];\n    var user = globalRoom.users[userId];\n    user.receiveMessage(m);\n  }\n}, 10);\n\nvar userIdCounter = 0;\n\nclass Test extends AbstractConnector {\n  constructor (options) {\n    if(options === undefined){\n      throw new Error(\"Options must not be undefined!\");\n    }\n    super({\n      role: \"master\"\n    });\n\n    this.setUserId((userIdCounter++) + \"\");\n  }\n  send (uid, message) {\n    globalRoom.buffers[uid].push(message);\n  }\n  broadcast (message) {\n    for (var buf of globalRoom.buffers) {\n      buf.push(message);\n    }\n  }\n  disconnect () {\n    globalRoom.removeUser(this.userId);\n  }\n}\n\nY.Test = Test;\n","/**\n * Copyright (c) 2014, Facebook, Inc.\n * All rights reserved.\n *\n * This source code is licensed under the BSD-style license found in the\n * https://raw.github.com/facebook/regenerator/master/LICENSE file. An\n * additional grant of patent rights can be found in the PATENTS file in\n * the same directory.\n */\n\n!(function(global) {\n  \"use strict\";\n\n  var hasOwn = Object.prototype.hasOwnProperty;\n  var undefined; // More compressible than void 0.\n  var iteratorSymbol =\n    typeof Symbol === \"function\" && Symbol.iterator || \"@@iterator\";\n\n  var inModule = typeof module === \"object\";\n  var runtime = global.regeneratorRuntime;\n  if (runtime) {\n    if (inModule) {\n      // If regeneratorRuntime is defined globally and we're in a module,\n      // make the exports object identical to regeneratorRuntime.\n      module.exports = runtime;\n    }\n    // Don't bother evaluating the rest of this file if the runtime was\n    // already defined globally.\n    return;\n  }\n\n  // Define the runtime globally (as expected by generated code) as either\n  // module.exports (if we're in a module) or a new, empty object.\n  runtime = global.regeneratorRuntime = inModule ? module.exports : {};\n\n  function wrap(innerFn, outerFn, self, tryLocsList) {\n    // If outerFn provided, then outerFn.prototype instanceof Generator.\n    var generator = Object.create((outerFn || Generator).prototype);\n\n    generator._invoke = makeInvokeMethod(\n      innerFn, self || null,\n      new Context(tryLocsList || [])\n    );\n\n    return generator;\n  }\n  runtime.wrap = wrap;\n\n  // Try/catch helper to minimize deoptimizations. Returns a completion\n  // record like context.tryEntries[i].completion. This interface could\n  // have been (and was previously) designed to take a closure to be\n  // invoked without arguments, but in all the cases we care about we\n  // already have an existing method we want to call, so there's no need\n  // to create a new function object. We can even get away with assuming\n  // the method takes exactly one argument, since that happens to be true\n  // in every case, so we don't have to touch the arguments object. 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For full spec compliance, you may wish to configure your\n  // minifier not to mangle the names of these two functions.\n  function Generator() {}\n  function GeneratorFunction() {}\n  function GeneratorFunctionPrototype() {}\n\n  var Gp = GeneratorFunctionPrototype.prototype = Generator.prototype;\n  GeneratorFunction.prototype = Gp.constructor = GeneratorFunctionPrototype;\n  GeneratorFunctionPrototype.constructor = GeneratorFunction;\n  GeneratorFunction.displayName = \"GeneratorFunction\";\n\n  // Helper for defining the .next, .throw, and .return methods of the\n  // Iterator interface in terms of a single ._invoke method.\n  function defineIteratorMethods(prototype) {\n    [\"next\", \"throw\", \"return\"].forEach(function(method) {\n      prototype[method] = function(arg) {\n        return this._invoke(method, arg);\n      };\n    });\n  }\n\n  runtime.isGeneratorFunction = function(genFun) {\n    var ctor = typeof genFun === \"function\" && genFun.constructor;\n    return ctor\n      ? ctor === GeneratorFunction ||\n        // For the native GeneratorFunction constructor, the best we can\n        // do is to check its .name property.\n        (ctor.displayName || ctor.name) === \"GeneratorFunction\"\n      : false;\n  };\n\n  runtime.mark = function(genFun) {\n    genFun.__proto__ = GeneratorFunctionPrototype;\n    genFun.prototype = Object.create(Gp);\n    return genFun;\n  };\n\n  // Within the body of any async function, `await x` is transformed to\n  // `yield regeneratorRuntime.awrap(x)`, so that the runtime can test\n  // `value instanceof AwaitArgument` to determine if the yielded value is\n  // meant to be awaited. Some may consider the name of this method too\n  // cutesy, but they are curmudgeons.\n  runtime.awrap = function(arg) {\n    return new AwaitArgument(arg);\n  };\n\n  function AwaitArgument(arg) {\n    this.arg = arg;\n  }\n\n  function AsyncIterator(generator) {\n    // This invoke function is written in a style that assumes some\n    // calling function (or Promise) will handle exceptions.\n    function invoke(method, arg) {\n      var result = generator[method](arg);\n      var value = result.value;\n      return value instanceof AwaitArgument\n        ? Promise.resolve(value.arg).then(invokeNext, invokeThrow)\n        : Promise.resolve(value).then(function(unwrapped) {\n            result.value = unwrapped;\n            return result;\n          }, invokeThrow);\n    }\n\n    if (typeof process === \"object\" && process.domain) {\n      invoke = process.domain.bind(invoke);\n    }\n\n    var invokeNext = invoke.bind(generator, \"next\");\n    var invokeThrow = invoke.bind(generator, \"throw\");\n    var invokeReturn = invoke.bind(generator, \"return\");\n    var previousPromise;\n\n    function enqueue(method, arg) {\n      var enqueueResult =\n        // If enqueue has been called before, then we want to wait until\n        // all previous Promises have been resolved before calling invoke,\n        // so that results are always delivered in the correct order. If\n        // enqueue has not been called before, then it is important to\n        // call invoke immediately, without waiting on a callback to fire,\n        // so that the async generator function has the opportunity to do\n        // any necessary setup in a predictable way. This predictability\n        // is why the Promise constructor synchronously invokes its\n        // executor callback, and why async functions synchronously\n        // execute code before the first await. Since we implement simple\n        // async functions in terms of async generators, it is especially\n        // important to get this right, even though it requires care.\n        previousPromise ? previousPromise.then(function() {\n          return invoke(method, arg);\n        }) : new Promise(function(resolve) {\n          resolve(invoke(method, arg));\n        });\n\n      // Avoid propagating enqueueResult failures to Promises returned by\n      // later invocations of the iterator, and call generator.return() to\n      // allow the generator a chance to clean up.\n      previousPromise = enqueueResult[\"catch\"](invokeReturn);\n\n      return enqueueResult;\n    }\n\n    // Define the unified helper method that is used to implement .next,\n    // .throw, and .return (see defineIteratorMethods).\n    this._invoke = enqueue;\n  }\n\n  defineIteratorMethods(AsyncIterator.prototype);\n\n  // Note that simple async functions are implemented on top of\n  // AsyncIterator objects; they just return a Promise for the value of\n  // the final result produced by the iterator.\n  runtime.async = function(innerFn, outerFn, self, tryLocsList) {\n    var iter = new AsyncIterator(\n      wrap(innerFn, outerFn, self, tryLocsList)\n    );\n\n    return runtime.isGeneratorFunction(outerFn)\n      ? iter // If outerFn is a generator, return the full iterator.\n      : iter.next().then(function(result) {\n          return result.done ? result.value : iter.next();\n        });\n  };\n\n  function makeInvokeMethod(innerFn, self, context) {\n    var state = GenStateSuspendedStart;\n\n    return function invoke(method, arg) {\n      if (state === GenStateExecuting) {\n        throw new Error(\"Generator is already running\");\n      }\n\n      if (state === GenStateCompleted) {\n        // Be forgiving, per 25.3.3.3.3 of the spec:\n        // https://people.mozilla.org/~jorendorff/es6-draft.html#sec-generatorresume\n        return doneResult();\n      }\n\n      while (true) {\n        var delegate = context.delegate;\n        if (delegate) {\n          if (method === \"return\" ||\n              (method === \"throw\" && delegate.iterator[method] === undefined)) {\n            // A return or throw (when the delegate iterator has no throw\n            // method) always terminates the yield* loop.\n            context.delegate = null;\n\n            // If the delegate iterator has a return method, give it a\n            // chance to clean up.\n            var returnMethod = delegate.iterator[\"return\"];\n            if (returnMethod) {\n              var record = tryCatch(returnMethod, delegate.iterator, arg);\n              if (record.type === \"throw\") {\n                // If the return method threw an exception, let that\n                // exception prevail over the original return or throw.\n                method = \"throw\";\n                arg = record.arg;\n                continue;\n              }\n            }\n\n            if (method === \"return\") {\n              // Continue with the outer return, now that the delegate\n              // iterator has been terminated.\n              continue;\n            }\n          }\n\n          var record = tryCatch(\n            delegate.iterator[method],\n            delegate.iterator,\n            arg\n          );\n\n          if (record.type === \"throw\") {\n            context.delegate = null;\n\n            // Like returning generator.throw(uncaught), but without the\n            // overhead of an extra function call.\n            method = \"throw\";\n            arg = record.arg;\n            continue;\n          }\n\n          // Delegate generator ran and handled its own exceptions so\n          // regardless of what the method was, we continue as if it is\n          // \"next\" with an undefined arg.\n          method = \"next\";\n          arg = undefined;\n\n          var info = record.arg;\n          if (info.done) {\n            context[delegate.resultName] = info.value;\n            context.next = delegate.nextLoc;\n          } else {\n            state = GenStateSuspendedYield;\n            return info;\n          }\n\n          context.delegate = null;\n        }\n\n        if (method === \"next\") {\n          if (state === GenStateSuspendedYield) {\n            context.sent = arg;\n          } else {\n            delete context.sent;\n          }\n\n        } else if (method === \"throw\") {\n          if (state === GenStateSuspendedStart) {\n            state = GenStateCompleted;\n            throw arg;\n          }\n\n          if (context.dispatchException(arg)) {\n            // If the dispatched exception was caught by a catch block,\n            // then let that catch block handle the exception normally.\n            method = \"next\";\n            arg = undefined;\n          }\n\n        } else if (method === \"return\") {\n          context.abrupt(\"return\", arg);\n        }\n\n        state = GenStateExecuting;\n\n        var record = tryCatch(innerFn, self, context);\n        if (record.type === \"normal\") {\n          // If an exception is thrown from innerFn, we leave state ===\n          // GenStateExecuting and loop back for another invocation.\n          state = context.done\n            ? GenStateCompleted\n            : GenStateSuspendedYield;\n\n          var info = {\n            value: record.arg,\n            done: context.done\n          };\n\n          if (record.arg === ContinueSentinel) {\n            if (context.delegate && method === \"next\") {\n              // Deliberately forget the last sent value so that we don't\n              // accidentally pass it on to the delegate.\n              arg = undefined;\n            }\n          } else {\n            return info;\n          }\n\n        } else if (record.type === \"throw\") {\n          state = GenStateCompleted;\n          // Dispatch the exception by looping back around to the\n          // context.dispatchException(arg) call above.\n          method = \"throw\";\n          arg = record.arg;\n        }\n      }\n    };\n  }\n\n  // Define Generator.prototype.{next,throw,return} in terms of the\n  // unified ._invoke helper method.\n  defineIteratorMethods(Gp);\n\n  Gp[iteratorSymbol] = function() {\n    return this;\n  };\n\n  Gp.toString = function() {\n    return \"[object Generator]\";\n  };\n\n  function pushTryEntry(locs) {\n    var entry = { tryLoc: locs[0] };\n\n    if (1 in locs) {\n      entry.catchLoc = locs[1];\n    }\n\n    if (2 in locs) {\n      entry.finallyLoc = locs[2];\n      entry.afterLoc = locs[3];\n    }\n\n    this.tryEntries.push(entry);\n  }\n\n  function resetTryEntry(entry) {\n    var record = entry.completion || {};\n    record.type = \"normal\";\n    delete record.arg;\n    entry.completion = record;\n  }\n\n  function Context(tryLocsList) {\n    // The root entry object (effectively a try statement without a catch\n    // or a finally block) gives us a place to store values thrown from\n    // locations where there is no enclosing try statement.\n    this.tryEntries = [{ tryLoc: \"root\" }];\n    tryLocsList.forEach(pushTryEntry, this);\n    this.reset();\n  }\n\n  runtime.keys = function(object) {\n    var keys = [];\n    for (var key in object) {\n      keys.push(key);\n    }\n    keys.reverse();\n\n    // Rather than returning an object with a next method, we keep\n    // things simple and return the next function itself.\n    return function next() {\n      while (keys.length) {\n        var key = keys.pop();\n        if (key in object) {\n          next.value = key;\n          next.done = false;\n          return next;\n        }\n      }\n\n      // To avoid creating an additional object, we just hang the .value\n      // and .done properties off the next function object itself. This\n      // also ensures that the minifier will not anonymize the function.\n      next.done = true;\n      return next;\n    };\n  };\n\n  function values(iterable) {\n    if (iterable) {\n      var iteratorMethod = iterable[iteratorSymbol];\n      if (iteratorMethod) {\n        return iteratorMethod.call(iterable);\n      }\n\n      if (typeof iterable.next === \"function\") {\n        return iterable;\n      }\n\n      if (!isNaN(iterable.length)) {\n        var i = -1, next = function next() {\n          while (++i < iterable.length) {\n            if (hasOwn.call(iterable, i)) {\n              next.value = iterable[i];\n              next.done = false;\n              return next;\n            }\n          }\n\n          next.value = undefined;\n          next.done = true;\n\n          return next;\n        };\n\n        return next.next = next;\n      }\n    }\n\n    // Return an iterator with no values.\n    return { next: doneResult };\n  }\n  runtime.values = values;\n\n  function doneResult() {\n    return { value: undefined, done: true };\n  }\n\n  Context.prototype = {\n    constructor: Context,\n\n    reset: function() {\n      this.prev = 0;\n      this.next = 0;\n      this.sent = undefined;\n      this.done = false;\n      this.delegate = null;\n\n      this.tryEntries.forEach(resetTryEntry);\n\n      // Pre-initialize at least 20 temporary variables to enable hidden\n      // class optimizations for simple generators.\n      for (var tempIndex = 0, tempName;\n           hasOwn.call(this, tempName = \"t\" + tempIndex) || tempIndex < 20;\n           ++tempIndex) {\n        this[tempName] = null;\n      }\n    },\n\n    stop: function() {\n      this.done = true;\n\n      var rootEntry = this.tryEntries[0];\n      var rootRecord = rootEntry.completion;\n      if (rootRecord.type === \"throw\") {\n        throw rootRecord.arg;\n      }\n\n      return this.rval;\n    },\n\n    dispatchException: function(exception) {\n      if (this.done) {\n        throw exception;\n      }\n\n      var context = this;\n      function handle(loc, caught) {\n        record.type = \"throw\";\n        record.arg = exception;\n        context.next = loc;\n        return !!caught;\n      }\n\n      for (var i = this.tryEntries.length - 1; i >= 0; --i) {\n        var entry = this.tryEntries[i];\n        var record = entry.completion;\n\n        if (entry.tryLoc === \"root\") {\n          // Exception thrown outside of any try block that could handle\n          // it, so set the completion value of the entire function to\n          // throw the exception.\n          return handle(\"end\");\n        }\n\n        if (entry.tryLoc <= this.prev) {\n          var hasCatch = hasOwn.call(entry, \"catchLoc\");\n          var hasFinally = hasOwn.call(entry, \"finallyLoc\");\n\n          if (hasCatch && hasFinally) {\n            if (this.prev < entry.catchLoc) {\n              return handle(entry.catchLoc, true);\n            } else if (this.prev < entry.finallyLoc) {\n              return handle(entry.finallyLoc);\n            }\n\n          } else if (hasCatch) {\n            if (this.prev < entry.catchLoc) {\n              return handle(entry.catchLoc, true);\n            }\n\n          } else if (hasFinally) {\n            if (this.prev < entry.finallyLoc) {\n              return handle(entry.finallyLoc);\n            }\n\n          } else {\n            throw new Error(\"try statement without catch or finally\");\n          }\n        }\n      }\n    },\n\n    abrupt: function(type, arg) {\n      for (var i = this.tryEntries.length - 1; i >= 0; --i) {\n        var entry = this.tryEntries[i];\n        if (entry.tryLoc <= this.prev &&\n            hasOwn.call(entry, \"finallyLoc\") &&\n            this.prev < entry.finallyLoc) {\n          var finallyEntry = entry;\n          break;\n        }\n      }\n\n      if (finallyEntry &&\n          (type === \"break\" ||\n           type === \"continue\") &&\n          finallyEntry.tryLoc <= arg &&\n          arg <= finallyEntry.finallyLoc) {\n        // Ignore the finally entry if control is not jumping to a\n        // location outside the try/catch block.\n        finallyEntry = null;\n      }\n\n      var record = finallyEntry ? finallyEntry.completion : {};\n      record.type = type;\n      record.arg = arg;\n\n      if (finallyEntry) {\n        this.next = finallyEntry.finallyLoc;\n      } else {\n        this.complete(record);\n      }\n\n      return ContinueSentinel;\n    },\n\n    complete: function(record, afterLoc) {\n      if (record.type === \"throw\") {\n        throw record.arg;\n      }\n\n      if (record.type === \"break\" ||\n          record.type === \"continue\") {\n        this.next = record.arg;\n      } else if (record.type === \"return\") {\n        this.rval = record.arg;\n        this.next = \"end\";\n      } else if (record.type === \"normal\" && afterLoc) {\n        this.next = afterLoc;\n      }\n    },\n\n    finish: function(finallyLoc) {\n      for (var i = this.tryEntries.length - 1; i >= 0; --i) {\n        var entry = this.tryEntries[i];\n        if (entry.finallyLoc === finallyLoc) {\n          this.complete(entry.completion, entry.afterLoc);\n          resetTryEntry(entry);\n          return ContinueSentinel;\n        }\n      }\n    },\n\n    \"catch\": function(tryLoc) {\n      for (var i = this.tryEntries.length - 1; i >= 0; --i) {\n        var entry = this.tryEntries[i];\n        if (entry.tryLoc === tryLoc) {\n          var record = entry.completion;\n          if (record.type === \"throw\") {\n            var thrown = record.arg;\n            resetTryEntry(entry);\n          }\n          return thrown;\n        }\n      }\n\n      // The context.catch method must only be called with a location\n      // argument that corresponds to a known catch block.\n      throw new Error(\"illegal catch attempt\");\n    },\n\n    delegateYield: function(iterable, resultName, nextLoc) {\n      this.delegate = {\n        iterator: values(iterable),\n        resultName: resultName,\n        nextLoc: nextLoc\n      };\n\n      return ContinueSentinel;\n    }\n  };\n})(\n  // Among the various tricks for obtaining a reference to the global\n  // object, this seems to be the most reliable technique that does not\n  // use indirect eval (which violates Content Security Policy).\n  typeof global === \"object\" ? global :\n  typeof window === \"object\" ? window :\n  typeof self === \"object\" ? self : this\n);\n","\nclass AbstractConnector { //eslint-disable-line no-unused-vars\n  /*\n    opts\n     .role : String Role of this client (\"master\" or \"slave\")\n     .userId : String that uniquely defines the user.\n  */\n  constructor (opts) {\n    if (opts == null){\n      opts = {};\n    }\n    if (opts.role == null || opts.role === \"master\") {\n      this.role = \"master\";\n    } else if (opts.role === \"slave\") {\n      this.role = \"slave\";\n    } else {\n      throw new Error(\"Role must be either 'master' or 'slave'!\");\n    }\n    this.role = opts.role;\n    this.connections = {};\n    this.userEventListeners = [];\n    this.whenSyncedListeners = [];\n    this.currentSyncTarget = null;\n  }\n  setUserId (userId) {\n    this.os.setUserId(userId);\n  }\n  onUserEvent (f) {\n    this.userEventListeners.push(f);\n  }\n  userLeft (user : string) {\n    delete this.connections[user];\n    if (user === this.currentSyncTarget){\n      this.currentSyncTarget = null;\n      this.findNextSyncTarget();\n    }\n    for (var f of this.userEventListeners){\n      f({\n        action: \"userLeft\",\n        user: user\n      });\n    }\n  }\n  userJoined (user, role) {\n    if(role == null){\n      throw new Error(\"You must specify the role of the joined user!\");\n    }\n    if (this.connections[user] != null) {\n      throw new Error(\"This user already joined!\");\n    }\n    this.connections[user] = {\n      isSynced: false,\n      role: role\n    };\n    for (var f of this.userEventListeners) {\n      f({\n        action: \"userJoined\",\n        user: user,\n        role: role\n      });\n    }\n  }\n  // Execute a function _when_ we are connected.\n  // If not connected, wait until connected\n  whenSynced (f) {\n    if (this.isSynced === true) {\n      f();\n    } else {\n      this.whenSyncedListeners.push(f);\n    }\n  }\n  // returns false, if there is no sync target\n  // true otherwise\n  findNextSyncTarget () {\n    if (this.currentSyncTarget != null && this.connections[this.currentSyncTarget].isSynced === false) {\n      throw new Error(\"The current sync has not finished!\");\n    }\n\n\n    var syncUser = null;\n    for (var uid in this.connections) {\n      syncUser = this.connections[uid];\n      if (!syncUser.isSynced) {\n        break;\n      }\n    }\n    if (syncUser != null){\n      var conn = this;\n      this.y.os.requestTransaction(function*(){\n        conn.currentSyncTarget = uid;\n        conn.send(uid, {\n          type: \"sync step 1\",\n          stateVector: yield* this.getStateVector()\n        });\n      });\n    }\n    // set the state to synced!\n    if (!this.isSynced) {\n      this.isSynced = true;\n      for (var f of this.whenSyncedListeners) {\n        f();\n      }\n      this.whenSyncedListeners = null;\n    }\n    return false;\n  }\n  // You received a raw message, and you know that it is intended for to Yjs. Then call this function.\n  receiveMessage (sender, m) {\n    if (m.type === \"sync step 1\") {\n      // TODO: make transaction, stream the ops\n      let conn = this;\n      this.os.requestTransaction(function*(){\n        var ops = yield* this.getOperations(m.stateVector);\n        var sv = yield* this.getStateVector();\n        conn.send(sender, {\n          type: \"sync step 2\",\n          os: ops,\n          stateVector: sv\n        });\n        conn.syncingClients.push(sender);\n        setTimeout(function(){\n          conn.syncingClients = conn.syncingClients.filter(function(cli){\n            return cli !== sender;\n          });\n          conn.send(sender, {\n            type: \"sync done\"\n          });\n        }, conn.syncingClientDuration);\n      });\n    } else if (m.type === \"sync step 2\") {\n      let conn = this;\n      this.os.requestTransaction(function*(){\n        var ops = yield* this.getOperations(m.stateVector);\n        conn.broadcast({\n          type: \"update\",\n          ops: ops\n        });\n      });\n    } else if (m.type === \"sync done\") {\n      this.connections[sender].isSynced = true;\n      this.findNextSyncTarget();\n    } else if (m.type === \"update\") {\n      for (var client of this.syncingClients) {\n        this.send(client, m);\n      }\n      this.os.apply(m.ops);\n    }\n  }\n  // Currently, the HB encodes operations as JSON. For the moment I want to keep it\n  // that way. Maybe we support encoding in the HB as XML in the future, but for now I don't want\n  // too much overhead. Y is very likely to get changed a lot in the future\n  //\n  // Because we don't want to encode JSON as string (with character escaping, wich makes it pretty much unreadable)\n  // we encode the JSON as XML.\n  //\n  // When the HB support encoding as XML, the format should look pretty much like this.\n  //\n  // does not support primitive values as array elements\n  // expects an ltx (less than xml) object\n  parseMessageFromXml (m) {\n    function parseArray (node) {\n      for (var n of node.children){\n        if (n.getAttribute(\"isArray\") === \"true\") {\n          return parseArray(n);\n        } else {\n          return parseObject(n);\n        }\n      }\n    }\n    function parseObject (node) {\n      var json = {};\n      for (var attrName in node.attrs) {\n        var value = node.attrs[attrName];\n        var int = parseInt(value);\n        if (isNaN(int) || (\"\" + int) !== value){\n          json[attrName] = value;\n        } else {\n          json[attrName] = int;\n        }\n      }\n      for (var n in node.children){\n        var name = n.name;\n        if (n.getAttribute(\"isArray\") === \"true\") {\n          json[name] = parseArray(n);\n        } else {\n          json[name] = parseObject(n);\n        }\n      }\n      return json;\n    }\n    parseObject(m);\n  }\n  // encode message in xml\n  // we use string because Strophe only accepts an \"xml-string\"..\n  // So {a:4,b:{c:5}} will look like\n  // <y a=\"4\">\n  //   <b c=\"5\"></b>\n  // </y>\n  // m - ltx element\n  // json - Object\n  encodeMessageToXml (msg, obj) {\n    // attributes is optional\n    function encodeObject (m, json) {\n      for (var name in json) {\n        var value = json[name];\n        if (name == null) {\n          // nop\n        } else if (value.constructor === Object) {\n          encodeObject(m.c(name), value);\n        } else if (value.constructor === Array) {\n          encodeArray(m.c(name), value);\n        } else {\n          m.setAttribute(name, value);\n        }\n      }\n    }\n    function encodeArray (m, array) {\n      m.setAttribute(\"isArray\", \"true\");\n      for (var e of array) {\n        if (e.constructor === Object) {\n          encodeObject(m.c(\"array-element\"), e);\n        } else {\n          encodeArray(m.c(\"array-element\"), e);\n        }\n      }\n    }\n    if (obj.constructor === Object) {\n      encodeObject(msg.c(\"y\", { xmlns: \"http://y.ninja/connector-stanza\" }), obj);\n    } else if (obj.constructor === Array) {\n      encodeArray(msg.c(\"y\", { xmlns: \"http://y.ninja/connector-stanza\" }), obj);\n    } else {\n      throw new Error(\"I can't encode this json!\");\n    }\n  }\n}\n","/* @flow */\nclass AbstractTransaction { //eslint-disable-line no-unused-vars\n  constructor (store : OperationStore) {\n    this.store = store;\n  }\n  // returns false if operation is not expected.\n  *addOperation (op) {\n    var state = this.getState(op.id[0]);\n    if (op.id[1] === state.clock){\n      state.clock++;\n      yield* this.setState(state);\n      this.store.operationAdded(op);\n      return true;\n    } else {\n      return false;\n    }\n  }\n}\n\ntype Listener = {\n  f : GeneratorFunction, // is called when all operations are available\n  missing : number // number of operations that are missing\n}\n\ntype Id = [string, number];\n\nclass AbstractOperationStore { //eslint-disable-line no-unused-vars\n  constructor (y) {\n    this.y = y;\n    this.parentListeners = {};\n    this.parentListenersRequestPending = false;\n    this.parentListenersActivated = {};\n    // E.g. this.listenersById[id] : Array<Listener>\n    this.listenersById = {};\n    // Execute the next time a transaction is requested\n    this.listenersByIdExecuteNow = [];\n    // A transaction is requested\n    this.listenersByIdRequestPending = false;\n    /* To make things more clear, the following naming conventions:\n       * ls : we put this.listenersById on ls\n       * l : Array<Listener>\n       * id : Id (can't use as property name)\n       * sid : String (converted from id via JSON.stringify\n                       so we can use it as a property name)\n\n      Always remember to first overwrite over\n      a property before you iterate over it!\n    */\n  }\n  apply (ops) {\n    for (var o of ops) {\n      var required = Y.Struct[o.type].requiredOps(o);\n      this.whenOperationsExist(required, Y.Struct[o.type].execute, o);\n    }\n  }\n  // f is called as soon as every operation requested is available.\n  // Note that Transaction can (and should) buffer requests.\n  whenOperationsExist (ids : Array<Id>, f : GeneratorFunction, args : Array<any>) {\n    if (ids.length > 0) {\n      let listener : Listener = {\n        f: f,\n        args: args || [],\n        missing: ids.length\n      };\n\n      for (let id of ids) {\n        let sid = JSON.stringify(id);\n        let l = this.listenersById[sid];\n        if (l == null){\n          l = [];\n          this.listenersById[sid] = l;\n        }\n        l.push(listener);\n      }\n    } else {\n      this.listenersByIdExecuteNow.push({\n        f: f,\n        args: args || []\n      });\n    }\n\n    if (this.listenersByIdRequestPending){\n      return;\n    }\n\n    this.listenersByIdRequestPending = true;\n    var store = this;\n\n    this.requestTransaction(function*(){\n      var exeNow = store.listenersByIdExecuteNow;\n      store.listenersByIdExecuteNow = [];\n\n      var ls = store.listenersById;\n      store.listenersById = {};\n\n      store.listenersByIdRequestPending = false;\n\n      for (let listener of exeNow) {\n        yield* listener.f.apply(this, listener.args);\n      }\n\n      for (var sid in ls){\n        var l = ls[sid];\n        var id = JSON.parse(sid);\n        if ((yield* this.getOperation(id)) == null){\n          store.listenersById[sid] = l;\n        } else {\n          for (let listener of l) {\n            if (--listener.missing === 0){\n              yield* listener.f.apply(this, listener.args);\n            }\n          }\n        }\n      }\n    });\n  }\n  // called by a transaction when an operation is added\n  operationAdded (op) {\n    // notify whenOperation listeners (by id)\n    var l = this.listenersById[op.id];\n    if (l != null) {\n      for (var listener of l){\n        if (--listener.missing === 0){\n          this.whenOperationsExist([], listener.f, listener.args);\n        }\n      }\n    }\n    // notify parent listeners, if possible\n    var listeners = this.parentListeners[op.parent];\n    if ( this.parentListenersRequestPending\n        || ( listeners == null )\n        || ( listeners.length === 0 )) {\n      return;\n    }\n    var al = this.parentListenersActivated[JSON.stringify(op.parent)];\n    if ( al == null ){\n      al = [];\n      this.parentListenersActivated[JSON.stringify(op.parent)] = al;\n    }\n    al.push(op);\n\n    this.parentListenersRequestPending = true;\n    var store = this;\n    this.requestTransaction(function*(){\n      store.parentListenersRequestPending = false;\n      var activatedOperations = store.parentListenersActivated;\n      store.parentListenersActivated = {};\n      for (var parentId in activatedOperations){\n        var parent = yield* this.getOperation(parentId);\n        Struct[parent.type].notifyObservers(activatedOperations[parentId]);\n      }\n    });\n\n  }\n  removeParentListener (id, f) {\n    var ls = this.parentListeners[id];\n    if (ls != null) {\n      this.parentListeners[id] = ls.filter(function(g){\n        return (f !== g);\n      });\n    }\n  }\n  addParentListener (id, f) {\n    var ls = this.parentListeners[JSON.stringify(id)];\n    if (ls == null) {\n      ls = [];\n      this.parentListeners[JSON.stringify(id)] = ls;\n    }\n    ls.push(f);\n  }\n}\n","/* @flow */\n\n// Op is anything that we could get from the OperationStore.\ntype Op = Object;\ntype Id = [string, number];\n\ntype List = {\n  id: Id,\n  start: Insert,\n  end: Insert\n};\n\ntype Insert = {\n  id: Id,\n  left: Insert,\n  right: Insert,\n  origin: Insert,\n  parent: List,\n  content: any\n};\n\nvar Struct = {\n  Operation: {  //eslint-disable-line no-unused-vars\n    create: function*(op : Op) : Struct.Operation {\n      var user = this.store.y.connector.userId;\n      var state = yield* this.getState(user);\n      op.id = [user, state.clock];\n      return yield* this.addOperation(op);\n    }\n  },\n  Insert: {\n    create: function*( op: Op,\n                      content: any,\n                      left: Insert,\n                      right: Insert,\n                      parent: List) : Insert {\n      op.left = left ? left.id : null;\n      op.origin = op.left;\n      op.right = right ? right.id : null;\n      op.parent = parent.id;\n      op.struct = \"Insert\";\n      yield* Struct.Operation.create.call(this, op);\n\n      if (left != null) {\n        left.right = op.id;\n        yield* this.setOperation(left);\n      }\n      if (right != null) {\n        right.left = op.id;\n        yield* this.setOperation(right);\n      }\n      return op;\n    },\n    requiredOps: function(op, ids){\n      if(op.left != null){\n        ids.push(op.left);\n      }\n      if(op.right != null){\n        ids.push(op.right);\n      }\n      return ids;\n    },\n    getDistanceToOrigin: function *(op){\n      var d = 0;\n      var o = yield this.getOperation(op.left);\n      while (op.origin !== (o ? o.id : null)) {\n        d++;\n        o = yield this.getOperation(o.left);\n      }\n      return d;\n    },\n    /*\n    # $this has to find a unique position between origin and the next known character\n    # case 1: $origin equals $o.origin: the $creator parameter decides if left or right\n    #         let $OL= [o1,o2,o3,o4], whereby $this is to be inserted between o1 and o4\n    #         o2,o3 and o4 origin is 1 (the position of o2)\n    #         there is the case that $this.creator < o2.creator, but o3.creator < $this.creator\n    #         then o2 knows o3. Since on another client $OL could be [o1,o3,o4] the problem is complex\n    #         therefore $this would be always to the right of o3\n    # case 2: $origin < $o.origin\n    #         if current $this insert_position > $o origin: $this ins\n    #         else $insert_position will not change\n    #         (maybe we encounter case 1 later, then this will be to the right of $o)\n    # case 3: $origin > $o.origin\n    #         $this insert_position is to the left of $o (forever!)\n    */\n    execute: function*(op){\n      var distanceToOrigin = yield* Struct.Insert.getDistanceToOrigin(op); // most cases: 0 (starts from 0)\n      var i = distanceToOrigin; // loop counter\n      var o = yield* this.getOperation(this.left);\n      o = yield* this.getOperation(o.right);\n      var tmp;\n      while (true) {\n        if (o.id !== this.right){\n          if (Struct.Insert.getDistanceToOrigin(o) === i) {\n            // case 1\n            if (o.id[0] < op.id[0]) {\n              op.left = o;\n              distanceToOrigin = i + 1;\n            }\n          } else if ((tmp = Struct.Insert.getDistanceToOrigin(o)) < i) {\n            // case 2\n            if (i - distanceToOrigin <= tmp) {\n              op.left = o;\n              distanceToOrigin = i + 1;\n            }\n          } else {\n            break;\n          }\n          i++;\n          o = yield* this.getOperation(o.next_cl);\n        } else {\n          break;\n        }\n      }\n      // reconnect..\n      var left = this.getOperation(op.left);\n      var right = this.getOperation(op.right);\n      left.right = op.id;\n      right.left = op.id;\n      op.left = left;\n      op.right = right;\n      yield* this.setOperation(left);\n      yield* this.setOperation(right);\n      yield* this.setOperation(op);\n    }\n  },\n  List: {\n    create: function*( op : Op){\n      op.start = null;\n      op.end = null;\n      op.struct = \"List\";\n      return yield* Struct.Operation.create.call(this, op);\n    },\n    requiredOps: function(op, ids){\n      if (op.start != null) {\n        ids.push(op.start);\n      }\n      if (op.end != null){\n        ids.push(op.end);\n      }\n      return ids;\n    },\n    execute: function* () {\n      // nop\n    },\n    ref: function* (op : Op, pos : number) : Insert {\n      var o = op.start;\n      while ( pos !== 0 || o != null) {\n        o = (yield* this.getOperation(o)).right;\n        pos--;\n      }\n      return (o == null) ? null : yield* this.getOperation(o);\n    },\n    map: function* (o : Op, f : Function) : Array<any> {\n      o = o.start;\n      var res = [];\n      while ( o != null) {\n        var operation = yield* this.getOperation(o);\n        res.push(f(operation.content));\n        o = operation.right;\n      }\n      return res;\n    },\n    insert: function* (op, pos : number, contents : Array<any>) {\n      var o = yield* Struct.List.ref.call(this, op, pos);\n      var or = yield* this.getOperation(o.right);\n      for (var content of contents) {\n        o = yield* Struct.Insert.create.call(this, {}, content, o, or, op);\n      }\n    }\n  }\n};\n","\nclass WebRTC extends AbstractConnector {\n  constructor (options) {\n    if(options === undefined){\n      throw new Error(\"Options must not be undefined!\");\n    }\n    super({\n      role: \"slave\"\n    });\n\n    var room = options.room;\n\n    // connect per default to our server\n    if(options.url == null){\n      options.url = \"https://yatta.ninja:8888\";\n    }\n\n    var swr = new SimpleWebRTC(options); //eslint-disable-line no-undef\n    this.swr = swr;\n    var self = this;\n\n    swr.once(\"connectionReady\", function(userId){\n      // SimpleWebRTC (swr) is initialized\n      swr.joinRoom(room);\n\n      swr.once(\"joinedRoom\", function(){\n        self.setUserId(userId);\n        var i;\n        // notify the connector class about all the users that already\n        // joined the session\n        for(i in self.swr.webrtc.peers){\n          self.userJoined(self.swr.webrtc.peers[i].id, \"master\");\n        }\n        swr.on(\"channelMessage\", function(peer, room_, message){\n          // The client received a message\n          // Check if the connector is already initialized,\n          // only then forward the message to the connector class\n          if(message.type != null ){\n            self.receiveMessage(peer.id, message.payload);\n          }\n        });\n      });\n\n      swr.on(\"createdPeer\", function(peer){\n        // a new peer/client joined the session.\n        // Notify the connector class, if the connector\n        // is already initialized\n        self.userJoined(peer.id, \"master\");\n      });\n\n      swr.on(\"peerStreamRemoved\", function(peer){\n        // a client left the session.\n        // Notify the connector class, if the connector\n        // is already initialized\n        self.userLeft(peer.id);\n      });\n    });\n  }\n  send (uid, message) {\n    var self = this;\n    // we have to make sure that the message is sent under all circumstances\n    var send = function(){\n      // check if the clients still exists\n      var peer = self.swr.webrtc.getPeers(uid)[0];\n      var success;\n      if(peer){\n        // success is true, if the message is successfully sent\n        success = peer.sendDirectly(\"simplewebrtc\", \"yjs\", message);\n      }\n      if(!success){\n        // resend the message if it didn't work\n        setTimeout(send, 500);\n      }\n    };\n    // try to send the message\n    send();\n  }\n  broadcast (message) {\n    this.swr.sendDirectlyToAll(\"simplewebrtc\", \"yjs\", message);\n  }\n}\n\nY.WebRTC = WebRTC;\n","\ntype State = {\n  user: string,\n  clock: number\n};\n\ntype StateVector = Array<State>;\n\ntype StateSet = Object;\n\ntype IDBTransaction = Function;\ntype IDBObjectStore = Function;\ntype IDBRequest = Function;\ntype IDBCursor = Function;\ntype IDBKeyRange = Function;\n\ntype IDBOpenDBRequest = Function;\n\ndeclare var indexedDB : Object;\n\nY.IndexedDB = (function(){ //eslint-disable-line no-unused-vars\n  class Transaction extends AbstractTransaction { //eslint-disable-line\n    transaction: IDBTransaction;\n    sv: IDBObjectStore;\n    os: IDBObjectStore;\n    store: OperationStore;\n\n    constructor (store : OperationStore) {\n      super(store);\n      this.transaction = store.db.transaction([\"OperationStore\", \"StateVector\"], \"readwrite\");\n      this.sv = this.transaction.objectStore(\"StateVector\");\n      this.os = this.transaction.objectStore(\"OperationStore\");\n      this.buffer = {};\n    }\n    *setOperation (op) {\n      yield this.os.put(op);\n      this.buffer[JSON.stringify(op.id)] = op;\n      return op;\n    }\n    *getOperation (id) {\n      var op = this.buffer[JSON.stringify(id)];\n      if (op == null) {\n        op = yield this.os.get(id);\n        this.buffer[JSON.stringify(id)] = op;\n      }\n      return op;\n    }\n    *removeOperation (id) {\n      this.buffer[JSON.stringify(id)] = null;\n      return yield this.os.delete(id);\n    }\n    *setState (state : State) : State {\n      return yield this.sv.put(state);\n    }\n    *getState (user : string) : State {\n      var state;\n      if ((state = yield this.sv.get(user)) != null){\n        return state;\n      } else {\n        return {\n          user: user,\n          clock: 0\n        };\n      }\n    }\n    *getStateVector () : StateVector {\n      var stateVector = [];\n      var cursorResult = this.sv.openCursor();\n      var cursor;\n      while ((cursor = yield cursorResult) != null) {\n        stateVector.push(cursor.value);\n        cursor.continue();\n      }\n      return stateVector;\n    }\n    *getStateSet () : StateSet {\n      var sv : StateVector = yield* this.getStateVector();\n      var ss : StateSet = {};\n      for (var state of sv){\n        ss[state.user] = state.clock;\n      }\n      return ss;\n    }\n\n    *getOperations (startSS : StateSet) {\n      if (startSS == null){\n        startSS = {};\n      }\n      var ops = [];\n\n      var endSV : StateVector = yield* this.getStateVector();\n      for (var endState of endSV) {\n        var user = endState.user;\n        var startPos = startSS[user] || 0;\n        var endPos = endState.clock;\n        var range = IDBKeyRange.bound([user, startPos], [user, endPos]);\n        var cursorResult = this.os.openCursor(range);\n        var cursor;\n        while ((cursor = yield cursorResult) != null) {\n          ops.push(cursor.value);\n          cursor.continue();\n        }\n      }\n      return ops;\n    }\n  }\n  class OperationStore extends AbstractOperationStore { //eslint-disable-line no-undef\n    namespace: string;\n    ready: Promise;\n    whenReadyListeners: Array<Function>;\n    constructor (y, opts) {\n      super(y);\n      if (opts == null) {\n        opts = {};\n      }\n      if (opts.namespace != null || typeof opts.namespace !== \"string\") {\n        throw new Error(\"IndexedDB: expect a string (opts.namespace)!\");\n      } else {\n        this.namespace = opts.namespace;\n      }\n\n      this.transactionQueue = {\n        queue: [],\n        onRequest: null\n      };\n\n      var store = this;\n\n      var tGen = (function *transactionGen(){\n        store.db = yield indexedDB.open(opts.namespace, 3);\n        var transactionQueue = store.transactionQueue;\n\n        var transaction = null;\n        var cont = true;\n        while (cont) {\n          var request = yield transactionQueue;\n          transaction = new Transaction(store);\n\n          yield* request.call(transaction, request);/*\n          while (transactionQueue.queue.length > 0) {\n            yield* transactionQueue.queue.shift().call(transaction);\n          }*/\n        }\n      })();\n\n      function handleTransactions(t){ //eslint-disable-line no-unused-vars\n        var request = t.value;\n        if (t.done){\n          return;\n        } else if (request.constructor === IDBRequest\n                   || request.constructor === IDBCursor ) {\n          request.onsuccess = function(){\n            handleTransactions(tGen.next(request.result));\n          };\n          request.onerror = function(err){\n            tGen.throw(err);\n          };\n        } else if (request === store.transactionQueue) {\n          if (request.queue.length > 0){\n            handleTransactions(tGen.next(request.queue.shift()));\n          } else {\n            request.onRequest = function(){\n              request.onRequest = null;\n              handleTransactions(tGen.next(request.queue.shift()));\n            };\n          }\n        } else if ( request.constructor === IDBOpenDBRequest ) {\n          request.onsuccess = function(event){\n            var db = event.target.result;\n            handleTransactions(tGen.next(db));\n          };\n          request.onerror = function(){\n            tGen.throw(\"Couldn't open IndexedDB database!\");\n          };\n          request.onupgradeneeded = function(event){\n            var db = event.target.result;\n            db.createObjectStore(\"OperationStore\", {keyPath: \"id\"});\n            db.createObjectStore(\"StateVector\", {keyPath: \"user\"});\n          };\n        } else {\n          tGen.throw(\"You can not yield this type!\");\n        }\n      }\n      handleTransactions(tGen.next());\n\n    }\n    requestTransaction (makeGen : Function) {\n      this.transactionQueue.queue.push(makeGen);\n      if (this.transactionQueue.onRequest != null) {\n        this.transactionQueue.onRequest();\n      }\n    }\n    *removeDatabase () {\n      this.db.close();\n      yield indexedDB.deleteDatabase(this.namespace);\n    }\n  }\n  return OperationStore;\n})();\n","\n\n(function(){\n\n  class List {\n    constructor (_model) {\n      this._model = _model;\n    }\n    *val (pos) {\n      if (pos != null) {\n        var o = yield* this.Struct.List.ref(this._model, pos);\n        return o ? o.content : null;\n      } else {\n        return yield* this.Struct.List.map(this._model, function(c){return c; });\n      }\n    }\n    *insert (pos, contents) {\n      yield* this.Struct.List.insert(pos, contents);\n    }\n  }\n\n  Y.List = function* YList(){\n    var model = yield* this.Struct.List.create();\n    return new List(model);\n  };\n  Y.List.Create = List;\n})();\n"],"sourceRoot":"/source/"}
\ No newline at end of file