diff --git a/Examples/OfflineEditing/index.js b/Examples/OfflineEditing/index.js
index aaa5484b..6708635b 100644
--- a/Examples/OfflineEditing/index.js
+++ b/Examples/OfflineEditing/index.js
@@ -3,7 +3,7 @@
 // create a shared object. This function call will return a promise!
 Y({
   db: {
-    name: 'IndexedDB',
+    name: 'indexeddb',
     namespace: 'offlineEditingDemo'
   },
   connector: {
@@ -11,8 +11,8 @@ Y({
     room: 'offlineEditingDemo',
     debug: true
   },
-  types: [],
-  sourceDir: '/bower_components/'
+  types: ['Array', 'Text'],
+  sourceDir: '/bower_components'
 }).then(function (yconfig) {
   // yconfig holds all the information about the shared object
   window.yconfig = yconfig
@@ -33,10 +33,10 @@ Y({
       text.bind(contenteditable)
     }
   })
-  // create a shared TextBind
+  // create a shared Text
   var textpromise = yconfig.root.get('text')
   if (textpromise == null) {
-    yconfig.root.set('text', Y.TextBind)
+    yconfig.root.set('text', Y.Text)
   }
   // We also provide a button for disconnecting/reconnecting the shared element
   var button = document.querySelector('#button')
diff --git a/Examples/TextBind/index.html b/Examples/TextBind/index.html
index 9bfd4525..891dc69a 100644
--- a/Examples/TextBind/index.html
+++ b/Examples/TextBind/index.html
@@ -5,8 +5,7 @@
   <h1 id="contenteditable" contentEditable></h1>
   <textarea style="width:80%;" rows=40 id="textfield"></textarea>
 
-  <script src="../../node_modules/simplewebrtc/simplewebrtc.bundle.js"></script>
-  <script src="../../y.js"></script>
+  <script src="../bower_components/yjs/y.js"></script>
   <script src="./index.js"></script>
 </body>
 </html>
diff --git a/Examples/TextBind/index.js b/Examples/TextBind/index.js
index d489a02a..ade46994 100644
--- a/Examples/TextBind/index.js
+++ b/Examples/TextBind/index.js
@@ -3,13 +3,15 @@
 // create a shared object. This function call will return a promise!
 Y({
   db: {
-    name: 'Memory'
+    name: 'memory'
   },
   connector: {
-    name: 'WebRTC',
-    room: 'TextBindDemo',
+    name: 'webrtc',
+    room: 'offlineEditingDemo',
     debug: true
-  }
+  },
+  types: ['Array', 'Text'],
+  sourceDir: '/bower_components/'
 }).then(function (yconfig) {
   // yconfig holds all the information about the shared object
   window.yconfig = yconfig
@@ -30,8 +32,8 @@ Y({
       text.bind(contenteditable)
     }
   })
-  // create a shared TextBind
-  yconfig.root.set('text', Y.TextBind)
+  // create a shared Text
+  yconfig.root.set('text', Y.Text)
 
   // We also provide a button for disconnecting/reconnecting the shared element
   var button = document.querySelector('#button')
diff --git a/y.js b/y.js
index 59d8901d..e2db4419 100644
--- a/y.js
+++ b/y.js
@@ -1,3 +1,2427 @@
-"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&&(Object.setPrototypeOf?Object.setPrototypeOf(e,t):e.__proto__=t)}function _classCallCheck(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}var _createClass=function(){function e(e,t){for(var r=0;r<t.length;r++){var n=t[r];n.enumerable=n.enumerable||!1,n.configurable=!0,"value"in n&&(n.writable=!0),Object.defineProperty(e,n.key,n)}}return function(t,r,n){return r&&e(t.prototype,r),n&&e(t,n),t}}();!function e(t,r,n){function i(s,o){if(!r[s]){if(!t[s]){var u="function"==typeof require&&require;if(!o&&u)return u(s,!0);if(a)return a(s,!0);var c=new Error("Cannot find module '"+s+"'");throw c.code="MODULE_NOT_FOUND",c}var l=r[s]={exports:{}};t[s][0].call(l.exports,function(e){var 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t=e.getUncle();null!==t&&t.isRed()?(e.parent.blacken(),t.blacken(),e.grandparent.redden(),this._fixInsert(e.grandparent)):(e===e.parent.right&&e.parent===e.grandparent.left?(e.parent.rotateLeft(this),e=e.left):e===e.parent.left&&e.parent===e.grandparent.right&&(e.parent.rotateRight(this),e=e.right),e.parent.blacken(),e.grandparent.redden(),e===e.parent.left?e.grandparent.rotateRight(this):e.grandparent.rotateLeft(this))}},r}();e.utils.RBTree=r}},{}],7:[function(e,t,r){t.exports=function(e){var t={Delete:{encode:function(e){return e},requiredOps:function(e){return[]},execute:regeneratorRuntime.mark(function r(e){return regeneratorRuntime.wrap(function(t){for(;;)switch(t.prev=t.next){case 0:return t.delegateYield(this.deleteOperation(e.target),"t0",1);case 1:return t.abrupt("return",t.t0);case 2:case"end":return t.stop()}},r,this)})},Insert:{encode:function(e){var t={id:e.id,left:e.left,right:e.right,origin:e.origin,parent:e.parent,struct:e.struct};return null!=e.parentSub&&(t.parentSub=e.parentSub),null!=e.opContent?t.opContent=e.opContent:t.content=e.content,t},requiredOps:function(t){var r=[];return null!=t.left&&r.push(t.left),null!=t.right&&r.push(t.right),null==t.origin||e.utils.compareIds(t.left,t.origin)||r.push(t.origin),r.push(t.parent),null!=t.opContent&&r.push(t.opContent),r},getDistanceToOrigin:regeneratorRuntime.mark(function n(t){var r,i;return regeneratorRuntime.wrap(function(n){for(;;)switch(n.prev=n.next){case 0:if(null!=t.left){n.next=4;break}return n.abrupt("return",0);case 4:return r=0,n.delegateYield(this.getOperation(t.left),"t0",6);case 6:i=n.t0;case 7:if(e.utils.compareIds(t.origin,i?i.id:null)){n.next=17;break}if(r++,null!=i.left){n.next=13;break}return n.abrupt("break",17);case 13:return n.delegateYield(this.getOperation(i.left),"t1",14);case 14:i=n.t1;case 15:n.next=7;break;case 17:return n.abrupt("return",r);case 18:case"end":return n.stop()}},n,this)}),execute:regeneratorRuntime.mark(function i(r){var n,a,s,o,u,c,l,d,p;return regeneratorRuntime.wrap(function(i){for(;;)switch(i.prev=i.next){case 0:return i.delegateYield(t.Insert.getDistanceToOrigin.call(this,r),"t0",1);case 1:if(a=n=i.t0,null==r.left){i.next=14;break}return i.delegateYield(this.getOperation(r.left),"t1",4);case 4:if(s=i.t1,null!=s.right){i.next=9;break}i.t2=null,i.next=11;break;case 9:return i.delegateYield(this.getOperation(s.right),"t3",10);case 10:i.t2=i.t3;case 11:s=i.t2,i.next=25;break;case 14:return i.delegateYield(this.getOperation(r.parent),"t4",15);case 15:if(o=i.t4,c=r.parentSub?o.map[r.parentSub]:o.start,null!=c){i.next=21;break}i.t5=null,i.next=23;break;case 21:return i.delegateYield(this.getOperation(c),"t6",22);case 22:i.t5=i.t6;case 23:u=i.t5,s=u;case 25:if(null==s||e.utils.compareIds(s.id,r.right)){i.next=48;break}return i.delegateYield(t.Insert.getDistanceToOrigin.call(this,s),"t7",28);case 28:if(l=i.t7,l!==n){i.next=33;break}s.id[0]<r.id[0]&&(r.left=s.id,a=n+1),i.next=38;break;case 33:if(!(n>l)){i.next=37;break}l>=n-a&&(r.left=s.id,a=n+1),i.next=38;break;case 37:return i.abrupt("break",51);case 38:if(n++,!s.right){i.next=44;break}return i.delegateYield(this.getOperation(s.right),"t9",41);case 41:i.t8=i.t9,i.next=45;break;case 44:i.t8=null;case 45:s=i.t8,i.next=49;break;case 48:return i.abrupt("break",51);case 49:i.next=25;break;case 51:if(d=null,p=null,i.t10=o,i.t10){i.next=57;break}return i.delegateYield(this.getOperation(r.parent),"t11",56);case 56:i.t10=i.t11;case 57:if(o=i.t10,null==r.left){i.next=66;break}return i.delegateYield(this.getOperation(r.left),"t12",60);case 60:return d=i.t12,r.right=d.right,d.right=r.id,i.delegateYield(this.setOperation(d),"t13",64);case 64:i.next=67;break;case 66:r.right=r.parentSub?o.map[r.parentSub]||null:o.start;case 67:if(null==r.right){i.next=73;break}return i.delegateYield(this.getOperation(r.right),"t14",69);case 69:return p=i.t14,p.left=r.id,null!=p.gc&&this.store.removeFromGarbageCollector(p),i.delegateYield(this.setOperation(p),"t15",73);case 73:if(null==r.parentSub){i.next=83;break}if(null!=d){i.next=77;break}return o.map[r.parentSub]=r.id,i.delegateYield(this.setOperation(o),"t16",77);case 77:if(null==r.right){i.next=79;break}return i.delegateYield(this.deleteOperation(r.right,!0),"t17",79);case 79:if(null==r.left){i.next=81;break}return i.delegateYield(this.deleteOperation(r.id,!0),"t18",81);case 81:i.next=87;break;case 83:if(null!=p&&null!=d){i.next=87;break}return null==p&&(o.end=r.id),null==d&&(o.start=r.id),i.delegateYield(this.setOperation(o),"t19",87);case 87:case"end":return i.stop()}},i,this)})},List:{encode:function(e){return{struct:"List",id:e.id,type:e.type}},requiredOps:function(){return[]},execute:regeneratorRuntime.mark(function a(e){return regeneratorRuntime.wrap(function(t){for(;;)switch(t.prev=t.next){case 0:e.start=null,e.end=null;case 2:case"end":return 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regeneratorRuntime.wrap(function(t){for(;;)switch(t.prev=t.next){case 0:return t.delegateYield(this.getOperation(e),"t0",1);case 1:if(r=t.t0,n=!1,null!=r&&r.deleted){t.next=5;break}return t.delegateYield(this.markDeleted(e),"t1",5);case 5:if(null==r||null!=r.gc){t.next=42;break}if(r.deleted){t.next=23;break}if(n=!0,r.deleted=!0,null==r.start){t.next=12;break}return t.delegateYield(this.deleteList(r.start),"t2",11);case 11:return t.delegateYield(this.deleteList(r.id),"t3",12);case 12:if(null==r.map){t.next=20;break}t.t4=regeneratorRuntime.keys(r.map);case 14:if((t.t5=t.t4()).done){t.next=19;break}return i=t.t5.value,t.delegateYield(this.deleteList(r.map[i]),"t6",17);case 17:t.next=14;break;case 19:return t.delegateYield(this.deleteList(r.id),"t7",20);case 20:if(null==r.opContent){t.next=23;break}return t.delegateYield(this.deleteOperation(r.opContent),"t8",22);case 22:r.opContent=null;case 23:if(null==r.left){t.next=28;break}return t.delegateYield(this.getOperation(r.left),"t10",25);case 25:t.t9=t.t10,t.next=29;break;case 28:t.t9=null;case 29:return s=t.t9,this.store.addToGarbageCollector(r,s),t.delegateYield(this.setOperation(r),"t11",32);case 32:if(null==r.right){t.next=37;break}return t.delegateYield(this.getOperation(r.right),"t13",34);case 34:t.t12=t.t13,t.next=38;break;case 37:t.t12=null;case 38:if(o=t.t12,null==o||!this.store.addToGarbageCollector(o,r)){t.next=41;break}return t.delegateYield(this.setOperation(o),"t14",41);case 41:return t.abrupt("return",n);case 42:case"end":return t.stop()}},a,this)}),t.prototype.markGarbageCollected=regeneratorRuntime.mark(function s(t){var r,n,i,a;return regeneratorRuntime.wrap(function(s){for(;;)switch(s.prev=s.next){case 0:return s.delegateYield(this.markDeleted(t),"t0",1);case 1:if(r=s.t0,r.gc){s.next=25;break}if(!(r.id[1]<t[1])){s.next=9;break}return n=r.len-(t[1]-r.id[1]),r.len-=n,s.delegateYield(this.ds.put(r),"t1",7);case 7:return r={id:t,len:n,gc:!1},s.delegateYield(this.ds.put(r),"t2",9);case 9:return s.delegateYield(this.ds.findPrev(t),"t3",10);case 10:return i=s.t3,s.delegateYield(this.ds.findNext(t),"t4",12);case 12:if(a=s.t4,!(t[1]<r.id[1]+r.len-1)){s.next=16;break}return s.delegateYield(this.ds.put({id:[t[0],t[1]+1],len:r.len-1,gc:!1}),"t5",15);case 15:r.len=1;case 16:if(r.gc=!0,null==i||!i.gc||!e.utils.compareIds([i.id[0],i.id[1]+i.len],r.id)){s.next=21;break}return i.len+=r.len,s.delegateYield(this.ds["delete"](r.id),"t6",20);case 20:r=i;case 21:if(null==a||!a.gc||!e.utils.compareIds([r.id[0],r.id[1]+r.len],a.id)){s.next=24;break}return r.len+=a.len,s.delegateYield(this.ds["delete"](a.id),"t7",24);case 24:return s.delegateYield(this.ds.put(r),"t8",25);case 25:case"end":return s.stop()}},s,this)}),t.prototype.markDeleted=regeneratorRuntime.mark(function o(t){var r,n;return regeneratorRuntime.wrap(function(i){for(;;)switch(i.prev=i.next){case 0:return i.delegateYield(this.ds.findWithUpperBound(t),"t0",1);case 1:if(r=i.t0,null==r||r.id[0]!==t[0]){i.next=15;break}if(!(r.id[1]<=t[1]&&t[1]<r.id[1]+r.len)){i.next=7;break}return i.abrupt("return",r);case 7:if(r.id[1]+r.len!==t[1]||r.gc){i.next=11;break}r.len++,i.next=13;break;case 11:return r={id:t,len:1,gc:!1},i.delegateYield(this.ds.put(r),"t1",13);case 13:i.next=17;break;case 15:return r={id:t,len:1,gc:!1},i.delegateYield(this.ds.put(r),"t2",17);case 17:return i.delegateYield(this.ds.findNext(r.id),"t3",18);case 18:if(n=i.t3,null==n||!e.utils.compareIds([r.id[0],r.id[1]+r.len],n.id)||n.gc){i.next=22;break}return r.len=r.len+n.len,i.delegateYield(this.ds["delete"](n.id),"t4",22);case 22:return i.delegateYield(this.ds.put(r),"t5",23);case 23:return i.abrupt("return",r);case 24:case"end":return i.stop()}},o,this)}),t.prototype.garbageCollectAfterSync=regeneratorRuntime.mark(function u(){return regeneratorRuntime.wrap(function(e){for(;;)switch(e.prev=e.next){case 0:return e.delegateYield(this.os.iterate(this,null,null,regeneratorRuntime.mark(function t(e){var r;return regeneratorRuntime.wrap(function(t){for(;;)switch(t.prev=t.next){case 0:if(!e.deleted||null==e.left){t.next=4;break}return t.delegateYield(this.getOperation(e.left),"t0",2);case 2:r=t.t0,this.store.addToGarbageCollector(e,r);case 4:case"end":return t.stop()}},t,this)})),"t0",1);case 1:case"end":return e.stop()}},u,this)}),t.prototype.garbageCollectOperation=regeneratorRuntime.mark(function c(t){var r,n,i,a,s,o,u,l,d,p;return regeneratorRuntime.wrap(function(c){for(;;)switch(c.prev=c.next){case 0:return this.store.addToDebug("yield* this.garbageCollectOperation(",t,")"),c.delegateYield(this.getState(t[0]),"t0",2);case 2:if(r=c.t0,r.clock!==t[1]){c.next=7;break}return r.clock++,c.delegateYield(this.checkDeleteStoreForState(r),"t1",6);case 6:return c.delegateYield(this.setState(r),"t2",7);case 7:return c.delegateYield(this.markGarbageCollected(t),"t3",8);case 8:return 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\ No newline at end of file
+(function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
+'use strict'
+
+module.exports = function (Y) {
+  class AbstractConnector {
+    /*
+      opts contains the following information:
+       role : String Role of this client ("master" or "slave")
+       userId : String Uniquely defines the user.
+       debug: Boolean Whether to print debug messages (optional)
+    */
+    constructor (y, opts) {
+      this.y = y
+      if (opts == null) {
+        opts = {}
+      }
+      if (opts.role == null || opts.role === 'master') {
+        this.role = 'master'
+      } else if (opts.role === 'slave') {
+        this.role = 'slave'
+      } else {
+        throw new Error("Role must be either 'master' or 'slave'!")
+      }
+      this.role = opts.role
+      this.connections = {}
+      this.isSynced = false
+      this.userEventListeners = []
+      this.whenSyncedListeners = []
+      this.currentSyncTarget = null
+      this.syncingClients = []
+      this.forwardToSyncingClients = opts.forwardToSyncingClients !== false
+      this.debug = opts.debug === true
+      this.broadcastedHB = false
+      this.syncStep2 = Promise.resolve()
+    }
+    reconnect () {
+    }
+    disconnect () {
+      this.connections = {}
+      this.isSynced = false
+      this.currentSyncTarget = null
+      this.broadcastedHB = false
+      this.syncingClients = []
+      this.whenSyncedListeners = []
+      return this.y.db.stopGarbageCollector()
+    }
+    setUserId (userId) {
+      this.userId = userId
+      return this.y.db.setUserId(userId)
+    }
+    onUserEvent (f) {
+      this.userEventListeners.push(f)
+    }
+    userLeft (user) {
+      delete this.connections[user]
+      if (user === this.currentSyncTarget) {
+        this.currentSyncTarget = null
+        this.findNextSyncTarget()
+      }
+      this.syncingClients = this.syncingClients.filter(function (cli) {
+        return cli !== user
+      })
+      for (var f of this.userEventListeners) {
+        f({
+          action: 'userLeft',
+          user: user
+        })
+      }
+    }
+    userJoined (user, role) {
+      if (role == null) {
+        throw new Error('You must specify the role of the joined user!')
+      }
+      if (this.connections[user] != null) {
+        throw new Error('This user already joined!')
+      }
+      this.connections[user] = {
+        isSynced: false,
+        role: role
+      }
+      for (var f of this.userEventListeners) {
+        f({
+          action: 'userJoined',
+          user: user,
+          role: role
+        })
+      }
+      if (this.currentSyncTarget == null) {
+        this.findNextSyncTarget()
+      }
+    }
+    // Execute a function _when_ we are connected.
+    // If not connected, wait until connected
+    whenSynced (f) {
+      if (this.isSynced) {
+        f()
+      } else {
+        this.whenSyncedListeners.push(f)
+      }
+    }
+    /*
+
+     returns false, if there is no sync target
+     true otherwise
+    */
+    findNextSyncTarget () {
+      if (this.currentSyncTarget != null || this.isSynced) {
+        return // "The current sync has not finished!"
+      }
+
+      var syncUser = null
+      for (var uid in this.connections) {
+        if (!this.connections[uid].isSynced) {
+          syncUser = uid
+          break
+        }
+      }
+      if (syncUser != null) {
+        var conn = this
+        this.currentSyncTarget = syncUser
+        this.y.db.requestTransaction(function *() {
+          conn.send(syncUser, {
+            type: 'sync step 1',
+            stateSet: yield* this.getStateSet(),
+            deleteSet: yield* this.getDeleteSet()
+          })
+        })
+      } else {
+        this.isSynced = true
+        // call when synced listeners
+        for (var f of this.whenSyncedListeners) {
+          f()
+        }
+        this.whenSyncedListeners = []
+        this.y.db.requestTransaction(function *() {
+          yield* this.garbageCollectAfterSync()
+        })
+      }
+    }
+    send (uid, message) {
+      if (this.debug) {
+        console.log(`send ${this.userId} -> ${uid}: ${message.type}`, m) // eslint-disable-line
+      }
+    }
+    /*
+      You received a raw message, and you know that it is intended for Yjs. Then call this function.
+    */
+    receiveMessage (sender, m) {
+      if (sender === this.userId) {
+        return
+      }
+      if (this.debug) {
+        console.log(`receive ${sender} -> ${this.userId}: ${m.type}`, JSON.parse(JSON.stringify(m))) // eslint-disable-line
+      }
+      if (m.type === 'sync step 1') {
+        // TODO: make transaction, stream the ops
+        let conn = this
+        this.y.db.requestTransaction(function *() {
+          var currentStateSet = yield* this.getStateSet()
+          yield* this.applyDeleteSet(m.deleteSet)
+
+          var ds = yield* this.getDeleteSet()
+          var ops = yield* this.getOperations(m.stateSet)
+          conn.send(sender, {
+            type: 'sync step 2',
+            os: ops,
+            stateSet: currentStateSet,
+            deleteSet: ds
+          })
+          if (this.forwardToSyncingClients) {
+            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 {
+            conn.send(sender, {
+              type: 'sync done'
+            })
+          }
+          conn._setSyncedWith(sender)
+        })
+      } else if (m.type === 'sync step 2') {
+        let conn = this
+        var broadcastHB = !this.broadcastedHB
+        this.broadcastedHB = true
+        var db = this.y.db
+        this.syncStep2 = new Promise(function (resolve) {
+          db.requestTransaction(function * () {
+            yield* this.applyDeleteSet(m.deleteSet)
+            this.store.apply(m.os)
+            db.requestTransaction(function * () {
+              var ops = yield* this.getOperations(m.stateSet)
+              if (ops.length > 0) {
+                m = {
+                  type: 'update',
+                  ops: ops
+                }
+                if (!broadcastHB) { // TODO: consider to broadcast here..
+                  conn.send(sender, m)
+                } else {
+                  // broadcast only once!
+                  conn.broadcast(m)
+                }
+              }
+              resolve()
+            })
+          })
+        })
+      } else if (m.type === 'sync done') {
+        var self = this
+        this.syncStep2.then(function () {
+          self._setSyncedWith(sender)
+        })
+      } else if (m.type === 'update') {
+        if (this.forwardToSyncingClients) {
+          for (var client of this.syncingClients) {
+            this.send(client, m)
+          }
+        }
+        this.y.db.apply(m.ops)
+      }
+    }
+    _setSyncedWith (user) {
+      var conn = this.connections[user]
+      if (conn != null) {
+        conn.isSynced = true
+      }
+      if (user === this.currentSyncTarget) {
+        this.currentSyncTarget = null
+        this.findNextSyncTarget()
+      }
+    }
+    /*
+      Currently, the HB encodes operations as JSON. For the moment I want to keep it
+      that way. Maybe we support encoding in the HB as XML in the future, but for now I don't want
+      too much overhead. Y is very likely to get changed a lot in the future
+
+      Because we don't want to encode JSON as string (with character escaping, wich makes it pretty much unreadable)
+      we encode the JSON as XML.
+
+      When the HB support encoding as XML, the format should look pretty much like this.
+
+      does not support primitive values as array elements
+      expects an ltx (less than xml) object
+    */
+    parseMessageFromXml (m) {
+      function parseArray (node) {
+        for (var n of node.children) {
+          if (n.getAttribute('isArray') === 'true') {
+            return parseArray(n)
+          } else {
+            return parseObject(n)
+          }
+        }
+      }
+      function parseObject (node) {
+        var json = {}
+        for (var attrName in node.attrs) {
+          var value = node.attrs[attrName]
+          var int = parseInt(value, 10)
+          if (isNaN(int) || ('' + int) !== value) {
+            json[attrName] = value
+          } else {
+            json[attrName] = int
+          }
+        }
+        for (var n in node.children) {
+          var name = n.name
+          if (n.getAttribute('isArray') === 'true') {
+            json[name] = parseArray(n)
+          } else {
+            json[name] = parseObject(n)
+          }
+        }
+        return json
+      }
+      parseObject(m)
+    }
+    /*
+      encode message in xml
+      we use string because Strophe only accepts an "xml-string"..
+      So {a:4,b:{c:5}} will look like
+      <y a="4">
+        <b c="5"></b>
+      </y>
+      m - ltx element
+      json - Object
+    */
+    encodeMessageToXml (msg, obj) {
+      // attributes is optional
+      function encodeObject (m, json) {
+        for (var name in json) {
+          var value = json[name]
+          if (name == null) {
+            // nop
+          } else if (value.constructor === Object) {
+            encodeObject(m.c(name), value)
+          } else if (value.constructor === Array) {
+            encodeArray(m.c(name), value)
+          } else {
+            m.setAttribute(name, value)
+          }
+        }
+      }
+      function encodeArray (m, array) {
+        m.setAttribute('isArray', 'true')
+        for (var e of array) {
+          if (e.constructor === Object) {
+            encodeObject(m.c('array-element'), e)
+          } else {
+            encodeArray(m.c('array-element'), e)
+          }
+        }
+      }
+      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!")
+      }
+    }
+  }
+  Y.AbstractConnector = AbstractConnector
+}
+
+},{}],2:[function(require,module,exports){
+/* global getRandom, wait, async */
+'use strict'
+
+module.exports = function (Y) {
+  var globalRoom = {
+    users: {},
+    buffers: {},
+    removeUser: function (user) {
+      for (var i in this.users) {
+        this.users[i].userLeft(user)
+      }
+      delete this.users[user]
+      delete this.buffers[user]
+    },
+    addUser: function (connector) {
+      this.users[connector.userId] = connector
+      this.buffers[connector.userId] = []
+      for (var uname in this.users) {
+        if (uname !== connector.userId) {
+          var u = this.users[uname]
+          u.userJoined(connector.userId, 'master')
+          connector.userJoined(u.userId, 'master')
+        }
+      }
+    }
+  }
+  Y.utils.globalRoom = globalRoom
+
+  function flushOne () {
+    var bufs = []
+    for (var i in globalRoom.buffers) {
+      if (globalRoom.buffers[i].length > 0) {
+        bufs.push(i)
+      }
+    }
+    if (bufs.length > 0) {
+      var userId = getRandom(bufs)
+      var m = globalRoom.buffers[userId].shift()
+      var user = globalRoom.users[userId]
+      user.receiveMessage(m[0], m[1])
+      return true
+    } else {
+      return false
+    }
+  }
+
+  // setInterval(flushOne, 10)
+
+  var userIdCounter = 0
+
+  class Test extends Y.AbstractConnector {
+    constructor (y, options) {
+      if (options === undefined) {
+        throw new Error('Options must not be undefined!')
+      }
+      options.role = 'master'
+      options.forwardToSyncingClients = false
+      super(y, options)
+      this.setUserId((userIdCounter++) + '').then(() => {
+        globalRoom.addUser(this)
+      })
+      this.globalRoom = globalRoom
+      this.syncingClientDuration = 0
+    }
+    receiveMessage (sender, m) {
+      super.receiveMessage(sender, JSON.parse(JSON.stringify(m)))
+    }
+    send (userId, message) {
+      var buffer = globalRoom.buffers[userId]
+      if (buffer != null) {
+        buffer.push(JSON.parse(JSON.stringify([this.userId, message])))
+      }
+    }
+    broadcast (message) {
+      for (var key in globalRoom.buffers) {
+        globalRoom.buffers[key].push(JSON.parse(JSON.stringify([this.userId, message])))
+      }
+    }
+    isDisconnected () {
+      return globalRoom.users[this.userId] == null
+    }
+    reconnect () {
+      if (this.isDisconnected()) {
+        globalRoom.addUser(this)
+        super.reconnect()
+      }
+      return this.flushAll()
+    }
+    disconnect () {
+      if (!this.isDisconnected()) {
+        globalRoom.removeUser(this.userId)
+        super.disconnect()
+      }
+      return wait()
+    }
+    flush () {
+      var self = this
+      return async(function * () {
+        yield wait()
+        while (globalRoom.buffers[self.userId].length > 0) {
+          var m = globalRoom.buffers[self.userId].shift()
+          this.receiveMessage(m[0], m[1])
+          yield wait()
+        }
+      })
+    }
+    flushAll () {
+      return new Promise(function (resolve) {
+        // flushes may result in more created operations,
+        // flush until there is nothing more to flush
+        function nextFlush () {
+          var c = flushOne()
+          if (c) {
+            while (flushOne()) {
+              // nop
+            }
+            wait().then(nextFlush)
+          } else {
+            wait().then(function () {
+              resolve()
+            })
+          }
+        }
+        // in the case that there are
+        // still actions that want to be performed
+        wait().then(nextFlush)
+      })
+    }
+    /*
+      Flushes an operation for some user..
+    */
+    flushOne () {
+      flushOne()
+    }
+  }
+
+  Y.Test = Test
+}
+
+},{}],3:[function(require,module,exports){
+'use strict'
+
+module.exports = function (Y) {
+  /*
+    Partial definition of an OperationStore.
+    TODO: name it Database, operation store only holds operations.
+
+    A database definition must alse define the following methods:
+    * logTable() (optional)
+      - show relevant information information in a table
+    * requestTransaction(makeGen)
+      - request a transaction
+    * destroy()
+      - destroy the database
+  */
+  class AbstractDatabase {
+    constructor (y, opts) {
+      this.y = y
+      // E.g. this.listenersById[id] : Array<Listener>
+      this.listenersById = {}
+      // Execute the next time a transaction is requested
+      this.listenersByIdExecuteNow = []
+      // A transaction is requested
+      this.listenersByIdRequestPending = false
+      /* To make things more clear, the following naming conventions:
+         * ls : we put this.listenersById on ls
+         * l : Array<Listener>
+         * id : Id (can't use as property name)
+         * sid : String (converted from id via JSON.stringify
+                         so we can use it as a property name)
+
+        Always remember to first overwrite
+        a property before you iterate over it!
+      */
+      // TODO: Use ES7 Weak Maps. This way types that are no longer user,
+      // wont be kept in memory.
+      this.initializedTypes = {}
+      this.whenUserIdSetListener = null
+      this.waitingTransactions = []
+      this.transactionInProgress = false
+      if (typeof YConcurrency_TestingMode !== 'undefined') {
+        this.executeOrder = []
+      }
+      this.gc1 = [] // first stage
+      this.gc2 = [] // second stage -> after that, remove the op
+      this.gcTimeout = opts.gcTimeout || 5000
+      var os = this
+      function garbageCollect () {
+        return new Promise((resolve) => {
+          os.requestTransaction(function * () {
+            if (os.y.connector != null && os.y.connector.isSynced) {
+              for (var i in os.gc2) {
+                var oid = os.gc2[i]
+                yield* this.garbageCollectOperation(oid)
+              }
+              os.gc2 = os.gc1
+              os.gc1 = []
+            }
+            if (os.gcTimeout > 0) {
+              os.gcInterval = setTimeout(garbageCollect, os.gcTimeout)
+            }
+            resolve()
+          })
+        })
+      }
+      this.garbageCollect = garbageCollect
+      if (this.gcTimeout > 0) {
+        garbageCollect()
+      }
+    }
+    addToDebug () {
+      if (typeof YConcurrency_TestingMode !== 'undefined') {
+        var command = Array.prototype.map.call(arguments, function (s) {
+          if (typeof s === 'string') {
+            return s
+          } else {
+            return JSON.stringify(s)
+          }
+        }).join('').replace(/"/g, "'").replace(/,/g, ', ').replace(/:/g, ': ')
+        this.executeOrder.push(command)
+      }
+    }
+    getDebugData () {
+      console.log(this.executeOrder.join('\n'))
+    }
+    stopGarbageCollector () {
+      var self = this
+      return new Promise(function (resolve) {
+        self.requestTransaction(function * () {
+          var ungc = self.gc1.concat(self.gc2)
+          self.gc1 = []
+          self.gc2 = []
+          for (var i in ungc) {
+            var op = yield* this.getOperation(ungc[i])
+            delete op.gc
+            yield* this.setOperation(op)
+          }
+          resolve()
+        })
+      })
+    }
+    /*
+      Try to add to GC.
+
+      TODO: rename this function
+
+      Rulez:
+      * Only gc if this user is online
+      * The most left element in a list must not be gc'd.
+        => There is at least one element in the list
+
+      returns true iff op was added to GC
+    */
+    addToGarbageCollector (op, left) {
+      if (
+        op.gc == null &&
+        op.deleted === true &&
+        this.y.connector.isSynced &&
+        left != null &&
+        left.deleted === true
+      ) {
+        op.gc = true
+        this.gc1.push(op.id)
+        return true
+      } else {
+        return false
+      }
+    }
+    removeFromGarbageCollector (op) {
+      function filter (o) {
+        return !Y.utils.compareIds(o, op.id)
+      }
+      this.gc1 = this.gc1.filter(filter)
+      this.gc2 = this.gc2.filter(filter)
+      delete op.gc
+    }
+    destroy () {
+      clearInterval(this.gcInterval)
+      this.gcInterval = null
+    }
+    setUserId (userId) {
+      var self = this
+      return new Promise(function (resolve) {
+        self.requestTransaction(function * () {
+          self.userId = userId
+          self.opClock = (yield* this.getState(userId)).clock
+          if (self.whenUserIdSetListener != null) {
+            self.whenUserIdSetListener()
+            self.whenUserIdSetListener = null
+          }
+          resolve()
+        })
+      })
+    }
+    whenUserIdSet (f) {
+      if (this.userId != null) {
+        f()
+      } else {
+        this.whenUserIdSetListener = f
+      }
+    }
+    getNextOpId () {
+      if (this.userId == null) {
+        throw new Error('OperationStore not yet initialized!')
+      }
+      return [this.userId, this.opClock++]
+    }
+    /*
+      Apply a list of operations.
+
+      * get a transaction
+      * check whether all Struct.*.requiredOps are in the OS
+      * check if it is an expected op (otherwise wait for it)
+      * check if was deleted, apply a delete operation after op was applied
+    */
+    apply (ops) {
+      for (var key in ops) {
+        var o = ops[key]
+        var required = Y.Struct[o.struct].requiredOps(o)
+        this.whenOperationsExist(required, o)
+      }
+    }
+    /*
+      op is executed as soon as every operation requested is available.
+      Note that Transaction can (and should) buffer requests.
+    */
+    whenOperationsExist (ids, op) {
+      if (ids.length > 0) {
+        let listener = {
+          op: op,
+          missing: ids.length
+        }
+
+        for (let key in ids) {
+          let id = ids[key]
+          let sid = JSON.stringify(id)
+          let l = this.listenersById[sid]
+          if (l == null) {
+            l = []
+            this.listenersById[sid] = l
+          }
+          l.push(listener)
+        }
+      } else {
+        this.listenersByIdExecuteNow.push({
+          op: op
+        })
+      }
+
+      if (this.listenersByIdRequestPending) {
+        return
+      }
+
+      this.listenersByIdRequestPending = true
+      var store = this
+
+      this.requestTransaction(function * () {
+        var exeNow = store.listenersByIdExecuteNow
+        store.listenersByIdExecuteNow = []
+
+        var ls = store.listenersById
+        store.listenersById = {}
+
+        store.listenersByIdRequestPending = false
+
+        for (let key in exeNow) {
+          let o = exeNow[key].op
+          yield* store.tryExecute.call(this, o)
+        }
+
+        for (var sid in ls) {
+          var l = ls[sid]
+          var id = JSON.parse(sid)
+          if ((yield* this.getOperation(id)) == null) {
+            store.listenersById[sid] = l
+          } else {
+            for (let key in l) {
+              let listener = l[key]
+              let o = listener.op
+              if (--listener.missing === 0) {
+                yield* store.tryExecute.call(this, o)
+              }
+            }
+          }
+        }
+      })
+    }
+    /*
+      Actually execute an operation, when all expected operations are available.
+    */
+    * tryExecute (op) {
+      this.store.addToDebug('yield* this.store.tryExecute.call(this, ', JSON.stringify(op), ')')
+      if (op.struct === 'Delete') {
+        yield* Y.Struct.Delete.execute.call(this, op)
+        yield* this.store.operationAdded(this, op)
+      } else if ((yield* this.getOperation(op.id)) == null && !(yield* this.isGarbageCollected(op.id))) {
+        yield* Y.Struct[op.struct].execute.call(this, op)
+        yield* this.addOperation(op)
+        yield* this.store.operationAdded(this, op)
+      }
+    }
+    // called by a transaction when an operation is added
+    * operationAdded (transaction, op) {
+      if (op.struct === 'Delete') {
+        var target = yield* transaction.getOperation(op.target)
+        if (target != null) {
+          var type = transaction.store.initializedTypes[JSON.stringify(target.parent)]
+          if (type != null) {
+            yield* type._changed(transaction, {
+              struct: 'Delete',
+              target: op.target
+            })
+          }
+        }
+      } else {
+        // increase SS
+        var o = op
+        var state = yield* transaction.getState(op.id[0])
+        while (o != null && o.id[1] === state.clock && op.id[0] === o.id[0]) {
+          // either its a new operation (1. case), or it is an operation that was deleted, but is not yet in the OS
+          state.clock++
+          yield* transaction.checkDeleteStoreForState(state)
+          o = yield* transaction.os.findNext(o.id)
+        }
+        yield* transaction.setState(state)
+
+        // notify whenOperation listeners (by id)
+        var sid = JSON.stringify(op.id)
+        var l = this.listenersById[sid]
+        delete this.listenersById[sid]
+
+        if (l != null) {
+          for (var key in l) {
+            var listener = l[key]
+            if (--listener.missing === 0) {
+              this.whenOperationsExist([], listener.op)
+            }
+          }
+        }
+        var t = this.initializedTypes[JSON.stringify(op.parent)]
+        // notify parent, if it has been initialized as a custom type
+        if (t != null) {
+          yield* t._changed(transaction, Y.utils.copyObject(op))
+        }
+
+        // Delete if DS says this is actually deleted
+        if (!op.deleted && (yield* transaction.isDeleted(op.id))) {
+          var delop = {
+            struct: 'Delete',
+            target: op.id
+          }
+          yield* Y.Struct['Delete'].execute.call(transaction, delop)
+          if (t != null) {
+            yield* t._changed(transaction, delop)
+          }
+        }
+      }
+    }
+    getNextRequest () {
+      if (this.waitingTransactions.length === 0) {
+        this.transactionInProgress = false
+        return null
+      } else {
+        return this.waitingTransactions.shift()
+      }
+    }
+    requestTransaction (makeGen, callImmediately) {
+      if (callImmediately) {
+        this.transact(makeGen)
+      } else if (!this.transactionInProgress) {
+        this.transactionInProgress = true
+        var self = this
+        setTimeout(function () {
+          self.transact(makeGen)
+        }, 0)
+      } else {
+        this.waitingTransactions.push(makeGen)
+      }
+    }
+  }
+  Y.AbstractDatabase = AbstractDatabase
+}
+
+},{}],4:[function(require,module,exports){
+'use strict'
+
+/*
+ An operation also defines the structure of a type. This is why operation and
+ structure are used interchangeably here.
+
+ It must be of the type Object. I hope to achieve some performance
+ improvements when working on databases that support the json format.
+
+ An operation must have the following properties:
+
+ * encode
+     - Encode the structure in a readable format (preferably string- todo)
+ * decode (todo)
+     - decode structure to json
+ * execute
+     - Execute the semantics of an operation.
+ * requiredOps
+     - Operations that are required to execute this operation.
+*/
+module.exports = function (Y) {
+  var Struct = {
+    /* This is the only operation that is actually not a structure, because
+    it is not stored in the OS. This is why it _does not_ have an id
+
+    op = {
+      target: Id
+    }
+    */
+    Delete: {
+      encode: function (op) {
+        return op
+      },
+      requiredOps: function (op) {
+        return [] // [op.target]
+      },
+      execute: function * (op) {
+        return yield* this.deleteOperation(op.target)
+      }
+    },
+    Insert: {
+      /* {
+          content: any,
+          id: Id,
+          left: Id,
+          origin: Id,
+          right: Id,
+          parent: Id,
+          parentSub: string (optional), // child of Map type
+        }
+      */
+      encode: function (op) {
+        // TODO: you could not send the "left" property, then you also have to
+        // "op.left = null" in $execute or $decode
+        var e = {
+          id: op.id,
+          left: op.left,
+          right: op.right,
+          origin: op.origin,
+          parent: op.parent,
+          struct: op.struct
+        }
+        if (op.parentSub != null) {
+          e.parentSub = op.parentSub
+        }
+        if (op.opContent != null) {
+          e.opContent = op.opContent
+        } else {
+          e.content = op.content
+        }
+
+        return e
+      },
+      requiredOps: function (op) {
+        var ids = []
+        if (op.left != null) {
+          ids.push(op.left)
+        }
+        if (op.right != null) {
+          ids.push(op.right)
+        }
+        if (op.origin != null && !Y.utils.compareIds(op.left, op.origin)) {
+          ids.push(op.origin)
+        }
+        // if (op.right == null && op.left == null) {
+        ids.push(op.parent)
+
+        if (op.opContent != null) {
+          ids.push(op.opContent)
+        }
+        return ids
+      },
+      getDistanceToOrigin: function * (op) {
+        if (op.left == null) {
+          return 0
+        } else {
+          var d = 0
+          var o = yield* this.getOperation(op.left)
+          while (!Y.utils.compareIds(op.origin, (o ? o.id : null))) {
+            d++
+            if (o.left == null) {
+              break
+            } else {
+              o = yield* this.getOperation(o.left)
+            }
+          }
+          return d
+        }
+      },
+      /*
+      # $this has to find a unique position between origin and the next known character
+      # case 1: $origin equals $o.origin: the $creator parameter decides if left or right
+      #         let $OL= [o1,o2,o3,o4], whereby $this is to be inserted between o1 and o4
+      #         o2,o3 and o4 origin is 1 (the position of o2)
+      #         there is the case that $this.creator < o2.creator, but o3.creator < $this.creator
+      #         then o2 knows o3. Since on another client $OL could be [o1,o3,o4] the problem is complex
+      #         therefore $this would be always to the right of o3
+      # case 2: $origin < $o.origin
+      #         if current $this insert_position > $o origin: $this ins
+      #         else $insert_position will not change
+      #         (maybe we encounter case 1 later, then this will be to the right of $o)
+      # case 3: $origin > $o.origin
+      #         $this insert_position is to the left of $o (forever!)
+      */
+      execute: function *(op) {
+        var i // loop counter
+        var distanceToOrigin = i = yield* Struct.Insert.getDistanceToOrigin.call(this, op) // most cases: 0 (starts from 0)
+        var o
+        var parent
+        var start
+
+        // find o. o is the first conflicting operation
+        if (op.left != null) {
+          o = yield* this.getOperation(op.left)
+          o = (o.right == null) ? null : yield* this.getOperation(o.right)
+        } else { // left == null
+          parent = yield* this.getOperation(op.parent)
+          let startId = op.parentSub ? parent.map[op.parentSub] : parent.start
+          start = startId == null ? null : yield* this.getOperation(startId)
+          o = start
+        }
+
+        // handle conflicts
+        while (true) {
+          if (o != null && !Y.utils.compareIds(o.id, op.right)) {
+            var oOriginDistance = yield* Struct.Insert.getDistanceToOrigin.call(this, o)
+            if (oOriginDistance === i) {
+              // case 1
+              if (o.id[0] < op.id[0]) {
+                op.left = o.id
+                distanceToOrigin = i + 1
+              }
+            } else if (oOriginDistance < i) {
+              // case 2
+              if (i - distanceToOrigin <= oOriginDistance) {
+                op.left = o.id
+                distanceToOrigin = i + 1
+              }
+            } else {
+              break
+            }
+            i++
+            o = o.right ? yield* this.getOperation(o.right) : null
+          } else {
+            break
+          }
+        }
+
+        // reconnect..
+        var left = null
+        var right = null
+        parent = parent || (yield* this.getOperation(op.parent))
+
+        // reconnect left and set right of op
+        if (op.left != null) {
+          left = yield* this.getOperation(op.left)
+          op.right = left.right
+          left.right = op.id
+
+          yield* this.setOperation(left)
+        } else {
+          op.right = op.parentSub ? parent.map[op.parentSub] || null : parent.start
+        }
+        // reconnect right
+        if (op.right != null) {
+          right = yield* this.getOperation(op.right)
+          right.left = op.id
+
+          // if right exists, and it is supposed to be gc'd. Remove it from the gc
+          if (right.gc != null) {
+            this.store.removeFromGarbageCollector(right)
+          }
+          yield* this.setOperation(right)
+        }
+
+        // update parents .map/start/end properties
+        if (op.parentSub != null) {
+          if (left == null) {
+            parent.map[op.parentSub] = op.id
+            yield* this.setOperation(parent)
+          }
+          // is a child of a map struct.
+          // Then also make sure that only the most left element is not deleted
+          if (op.right != null) {
+            yield* this.deleteOperation(op.right, true)
+          }
+          if (op.left != null) {
+            yield* this.deleteOperation(op.id, true)
+          }
+        } else {
+          if (right == null || left == null) {
+            if (right == null) {
+              parent.end = op.id
+            }
+            if (left == null) {
+              parent.start = op.id
+            }
+            yield* this.setOperation(parent)
+          }
+        }
+      }
+    },
+    List: {
+      /*
+      {
+        start: null,
+        end: null,
+        struct: "List",
+        type: "",
+        id: this.os.getNextOpId()
+      }
+      */
+      encode: function (op) {
+        return {
+          struct: 'List',
+          id: op.id,
+          type: op.type
+        }
+      },
+      requiredOps: function () {
+        /*
+        var ids = []
+        if (op.start != null) {
+          ids.push(op.start)
+        }
+        if (op.end != null){
+          ids.push(op.end)
+        }
+        return ids
+        */
+        return []
+      },
+      execute: function * (op) {
+        op.start = null
+        op.end = null
+      },
+      ref: function * (op, pos) {
+        if (op.start == null) {
+          return null
+        }
+        var res = null
+        var o = yield* this.getOperation(op.start)
+
+        while (true) {
+          if (!o.deleted) {
+            res = o
+            pos--
+          }
+          if (pos >= 0 && o.right != null) {
+            o = (yield* this.getOperation(o.right))
+          } else {
+            break
+          }
+        }
+        return res
+      },
+      map: function * (o, f) {
+        o = o.start
+        var res = []
+        while (o != null) { // TODO: change to != (at least some convention)
+          var operation = yield* this.getOperation(o)
+          if (!operation.deleted) {
+            res.push(f(operation))
+          }
+          o = operation.right
+        }
+        return res
+      }
+    },
+    Map: {
+      /*
+        {
+          map: {},
+          struct: "Map",
+          type: "",
+          id: this.os.getNextOpId()
+        }
+      */
+      encode: function (op) {
+        return {
+          struct: 'Map',
+          type: op.type,
+          id: op.id,
+          map: {} // overwrite map!!
+        }
+      },
+      requiredOps: function () {
+        return []
+      },
+      execute: function * () {},
+      /*
+        Get a property by name
+      */
+      get: function * (op, name) {
+        var oid = op.map[name]
+        if (oid != null) {
+          var res = yield* this.getOperation(oid)
+          return (res == null || res.deleted) ? void 0 : (res.opContent == null
+            ? res.content : yield* this.getType(res.opContent))
+        }
+      },
+      /*
+        Delete a property by name
+      */
+      delete: function * (op, name) {
+        var v = op.map[name] || null
+        if (v != null) {
+          yield* Struct.Delete.create.call(this, {
+            target: v
+          })
+        }
+      }
+    }
+  }
+  Y.Struct = Struct
+}
+
+},{}],5:[function(require,module,exports){
+'use strict'
+
+/*
+  Partial definition of a transaction
+
+  A transaction provides all the the async functionality on a database.
+
+  By convention, a transaction has the following properties:
+  * ss for StateSet
+  * os for OperationStore
+  * ds for DeleteStore
+
+  A transaction must also define the following methods:
+  * checkDeleteStoreForState(state)
+    - When increasing the state of a user, an operation with an higher id
+      may already be garbage collected, and therefore it will never be received.
+      update the state to reflect this knowledge. This won't call a method to save the state!
+  * getDeleteSet(id)
+    - Get the delete set in a readable format:
+      {
+        "userX": [
+          [5,1], // starting from position 5, one operations is deleted
+          [9,4]  // starting from position 9, four operations are deleted
+        ],
+        "userY": ...
+      }
+  * getOpsFromDeleteSet(ds) -- TODO: just call this.deleteOperation(id) here
+    - get a set of deletions that need to be applied in order to get to
+      achieve the state of the supplied ds
+  * setOperation(op)
+    - write `op` to the database.
+      Note: this is allowed to return an in-memory object.
+      E.g. the Memory adapter returns the object that it has in-memory.
+      Changing values on this object will be stored directly in the database
+      without calling this function. Therefore,
+      setOperation may have no functionality in some adapters. This also has
+      implications on the way we use operations that were served from the database.
+      We try not to call copyObject, if not necessary.
+  * addOperation(op)
+    - add an operation to the database.
+      This may only be called once for every op.id
+      Must return a function that returns the next operation in the database (ordered by id)
+  * getOperation(id)
+  * removeOperation(id)
+    - remove an operation from the database. This is called when an operation
+      is garbage collected.
+  * setState(state)
+    - `state` is of the form
+      {
+        user: "1",
+        clock: 4
+      } <- meaning that we have four operations from user "1"
+           (with these id's respectively: 0, 1, 2, and 3)
+  * getState(user)
+  * getStateVector()
+    - Get the state of the OS in the form
+    [{
+      user: "userX",
+      clock: 11
+    },
+     ..
+    ]
+  * getStateSet()
+    - Get the state of the OS in the form
+    {
+      "userX": 11,
+      "userY": 22
+    }
+   * getOperations(startSS)
+     - Get the all the operations that are necessary in order to achive the
+       stateSet of this user, starting from a stateSet supplied by another user
+   * makeOperationReady(ss, op)
+     - this is called only by `getOperations(startSS)`. It makes an operation
+       applyable on a given SS.
+*/
+module.exports = function (Y) {
+  class Transaction {
+    /*
+      Get a type based on the id of its model.
+      If it does not exist yes, create it.
+      TODO: delete type from store.initializedTypes[id] when corresponding id was deleted!
+    */
+    * getType (id) {
+      var sid = JSON.stringify(id)
+      var t = this.store.initializedTypes[sid]
+      if (t == null) {
+        var op = yield* this.getOperation(id)
+        if (op != null) {
+          t = yield* Y[op.type].initType.call(this, this.store, op)
+          this.store.initializedTypes[sid] = t
+        }
+      }
+      return t
+    }
+    /*
+      Apply operations that this user created (no remote ones!)
+        * does not check for Struct.*.requiredOps()
+        * also broadcasts it through the connector
+    */
+    * applyCreatedOperations (ops) {
+      var send = []
+      for (var i = 0; i < ops.length; i++) {
+        var op = ops[i]
+        yield* this.store.tryExecute.call(this, op)
+        send.push(Y.Struct[op.struct].encode(op))
+      }
+      if (!this.store.y.connector.isDisconnected()) {
+        this.store.y.connector.broadcast({
+          type: 'update',
+          ops: send
+        })
+      }
+    }
+
+    * deleteList (start) {
+      if (this.store.y.connector.isSynced) {
+        while (start != null && this.store.y.connector.isSynced) {
+          start = (yield* this.getOperation(start))
+          start.gc = true
+          yield* this.setOperation(start)
+          // TODO: will always reset the parent..
+          this.store.gc1.push(start.id)
+          start = start.right
+        }
+      } else {
+        // TODO: when not possible??? do later in (gcWhenSynced)
+      }
+    }
+
+    /*
+      Mark an operation as deleted, and add it to the GC, if possible.
+    */
+    * deleteOperation (targetId, preventCallType) {
+      var target = yield* this.getOperation(targetId)
+      var callType = false
+
+      if (target == null || !target.deleted) {
+        yield* this.markDeleted(targetId)
+      }
+
+      if (target != null && target.gc == null) {
+        if (!target.deleted) {
+          callType = true
+          // set deleted & notify type
+          target.deleted = true
+          /*
+          if (!preventCallType) {
+            var type = this.store.initializedTypes[JSON.stringify(target.parent)]
+            if (type != null) {
+              yield* type._changed(this, {
+                struct: 'Delete',
+                target: targetId
+              })
+            }
+          }
+          */
+          // delete containing lists
+          if (target.start != null) {
+            // TODO: don't do it like this .. -.-
+            yield* this.deleteList(target.start)
+            yield* this.deleteList(target.id)
+          }
+          if (target.map != null) {
+            for (var name in target.map) {
+              yield* this.deleteList(target.map[name])
+            }
+            // TODO: here to..  (see above)
+            yield* this.deleteList(target.id)
+          }
+          if (target.opContent != null) {
+            yield* this.deleteOperation(target.opContent)
+            target.opContent = null
+          }
+        }
+        var left = target.left != null ? yield* this.getOperation(target.left) : null
+
+        this.store.addToGarbageCollector(target, left)
+
+        // set here because it was deleted and/or gc'd
+        yield* this.setOperation(target)
+
+        /*
+          Check if it is possible to add right to the gc.
+          Because this delete can't be responsible for left being gc'd,
+          we don't have to add left to the gc..
+        */
+        var right = target.right != null ? yield* this.getOperation(target.right) : null
+        if (
+          right != null &&
+          this.store.addToGarbageCollector(right, target)
+        ) {
+          yield* this.setOperation(right)
+        }
+        return callType
+      }
+    }
+    /*
+      Mark an operation as deleted&gc'd
+    */
+    * markGarbageCollected (id) {
+      // this.mem.push(["gc", id]);
+      var n = yield* this.markDeleted(id)
+      if (!n.gc) {
+        if (n.id[1] < id[1]) {
+          // un-extend left
+          var newlen = n.len - (id[1] - n.id[1])
+          n.len -= newlen
+          yield* this.ds.put(n)
+          n = {id: id, len: newlen, gc: false}
+          yield* this.ds.put(n)
+        }
+        // get prev&next before adding a new operation
+        var prev = yield* this.ds.findPrev(id)
+        var next = yield* this.ds.findNext(id)
+
+        if (id[1] < n.id[1] + n.len - 1) {
+          // un-extend right
+          yield* this.ds.put({id: [id[0], id[1] + 1], len: n.len - 1, gc: false})
+          n.len = 1
+        }
+        // set gc'd
+        n.gc = true
+        // can extend left?
+        if (
+          prev != null &&
+          prev.gc &&
+          Y.utils.compareIds([prev.id[0], prev.id[1] + prev.len], n.id)
+        ) {
+          prev.len += n.len
+          yield* this.ds.delete(n.id)
+          n = prev
+          // ds.put n here?
+        }
+        // can extend right?
+        if (
+          next != null &&
+          next.gc &&
+          Y.utils.compareIds([n.id[0], n.id[1] + n.len], next.id)
+        ) {
+          n.len += next.len
+          yield* this.ds.delete(next.id)
+        }
+        yield* this.ds.put(n)
+      }
+    }
+    /*
+      Mark an operation as deleted.
+
+      returns the delete node
+    */
+    * markDeleted (id) {
+      // this.mem.push(["del", id]);
+      var n = yield* this.ds.findWithUpperBound(id)
+      if (n != null && n.id[0] === id[0]) {
+        if (n.id[1] <= id[1] && id[1] < n.id[1] + n.len) {
+          // already deleted
+          return n
+        } else if (n.id[1] + n.len === id[1] && !n.gc) {
+          // can extend existing deletion
+          n.len++
+        } else {
+          // cannot extend left
+          n = {id: id, len: 1, gc: false}
+          yield* this.ds.put(n)
+        }
+      } else {
+        // cannot extend left
+        n = {id: id, len: 1, gc: false}
+        yield* this.ds.put(n)
+      }
+      // can extend right?
+      var next = yield* this.ds.findNext(n.id)
+      if (
+        next != null &&
+        Y.utils.compareIds([n.id[0], n.id[1] + n.len], next.id) &&
+        !next.gc
+      ) {
+        n.len = n.len + next.len
+        yield* this.ds.delete(next.id)
+      }
+      yield* this.ds.put(n)
+      return n
+    }
+    /*
+      Call this method when the client is connected&synced with the
+      other clients (e.g. master). This will query the database for
+      operations that can be gc'd and add them to the garbage collector.
+    */
+    * garbageCollectAfterSync () {
+      yield* this.os.iterate(this, null, null, function * (op) {
+        if (op.deleted && op.left != null) {
+          var left = yield* this.getOperation(op.left)
+          this.store.addToGarbageCollector(op, left)
+        }
+      })
+    }
+    /*
+      Really remove an op and all its effects.
+      The complicated case here is the Insert operation:
+      * reset left
+      * reset right
+      * reset parent.start
+      * reset parent.end
+      * reset origins of all right ops
+    */
+    * garbageCollectOperation (id) {
+      this.store.addToDebug('yield* this.garbageCollectOperation(', id, ')')
+      // check to increase the state of the respective user
+      var state = yield* this.getState(id[0])
+      if (state.clock === id[1]) {
+        state.clock++
+        // also check if more expected operations were gc'd
+        yield* this.checkDeleteStoreForState(state)
+        // then set the state
+        yield* this.setState(state)
+      }
+      yield* this.markGarbageCollected(id)
+
+      // if op exists, then clean that mess up..
+      var o = yield* this.getOperation(id)
+      if (o != null) {
+        /*
+        if (!o.deleted) {
+          yield* this.deleteOperation(id)
+          o = yield* this.getOperation(id)
+        }
+        */
+
+        // remove gc'd op from the left op, if it exists
+        if (o.left != null) {
+          var left = yield* this.getOperation(o.left)
+          left.right = o.right
+          yield* this.setOperation(left)
+        }
+        // remove gc'd op from the right op, if it exists
+        // also reset origins of right ops
+        if (o.right != null) {
+          var right = yield* this.getOperation(o.right)
+          right.left = o.left
+          if (Y.utils.compareIds(right.origin, o.id)) { // rights origin is o
+            // find new origin of right ops
+            // origin is the first left deleted operation
+            var neworigin = o.left
+            while (neworigin != null) {
+              var neworigin_ = yield* this.getOperation(neworigin)
+              if (neworigin_.deleted) {
+                break
+              }
+              neworigin = neworigin_.left
+            }
+
+            // reset origin of right
+            right.origin = neworigin
+
+            // reset origin of all right ops (except first right - duh!),
+            // until you find origin pointer to the left of o
+            var i = right.right == null ? null : yield* this.getOperation(right.right)
+            var ids = [o.id, o.right]
+            while (i != null && ids.some(function (id) {
+              return Y.utils.compareIds(id, i.origin)
+            })) {
+              if (Y.utils.compareIds(i.origin, o.id)) {
+                // reset origin of i
+                i.origin = neworigin
+                yield* this.setOperation(i)
+              }
+              // get next i
+              i = i.right == null ? null : yield* this.getOperation(i.right)
+            }
+          } /* otherwise, rights origin is to the left of o,
+               then there is no right op (from o), that origins in o */
+          yield* this.setOperation(right)
+        }
+
+        if (o.parent != null) {
+          // remove gc'd op from parent, if it exists
+          var parent = yield* this.getOperation(o.parent)
+          var setParent = false // whether to save parent to the os
+          if (o.parentSub != null) {
+            if (Y.utils.compareIds(parent.map[o.parentSub], o.id)) {
+              setParent = true
+              parent.map[o.parentSub] = o.right
+            }
+          } else {
+            if (Y.utils.compareIds(parent.start, o.id)) {
+              // gc'd op is the start
+              setParent = true
+              parent.start = o.right
+            }
+            if (Y.utils.compareIds(parent.end, o.id)) {
+              // gc'd op is the end
+              setParent = true
+              parent.end = o.left
+            }
+          }
+          if (setParent) {
+            yield* this.setOperation(parent)
+          }
+        }
+        // finally remove it from the os
+        yield* this.removeOperation(o.id)
+      }
+    }
+    * checkDeleteStoreForState (state) {
+      var n = yield* this.ds.findWithUpperBound([state.user, state.clock])
+      if (n != null && n.id[0] === state.user && n.gc) {
+        state.clock = Math.max(state.clock, n.id[1] + n.len)
+      }
+    }
+    /*
+      apply a delete set in order to get
+      the state of the supplied ds
+    */
+    * applyDeleteSet (ds) {
+      var deletions = []
+      function createDeletions (user, start, len, gc) {
+        for (var c = start; c < start + len; c++) {
+          deletions.push([user, c, gc])
+        }
+      }
+
+      for (var user in ds) {
+        var dv = ds[user]
+        var pos = 0
+        var d = dv[pos]
+        yield* this.ds.iterate(this, [user, 0], [user, Number.MAX_VALUE], function * (n) {
+          // cases:
+          // 1. d deletes something to the right of n
+          //  => go to next n (break)
+          // 2. d deletes something to the left of n
+          //  => create deletions
+          //  => reset d accordingly
+          //  *)=> if d doesn't delete anything anymore, go to next d (continue)
+          // 3. not 2) and d deletes something that also n deletes
+          //  => reset d so that it doesn't contain n's deletion
+          //  *)=> if d does not delete anything anymore, go to next d (continue)
+          while (d != null) {
+            var diff = 0 // describe the diff of length in 1) and 2)
+            if (n.id[1] + n.len <= d[0]) {
+              // 1)
+              break
+            } else if (d[0] < n.id[1]) {
+              // 2)
+              // delete maximum the len of d
+              // else delete as much as possible
+              diff = Math.min(n.id[1] - d[0], d[1])
+              createDeletions(user, d[0], diff, d[2])
+            } else {
+              // 3)
+              diff = n.id[1] + n.len - d[0] // never null (see 1)
+              if (d[2] && !n.gc) {
+                // d marks as gc'd but n does not
+                // then delete either way
+                createDeletions(user, d[0], Math.min(diff, d[1]), d[2])
+              }
+            }
+            if (d[1] <= diff) {
+              // d doesn't delete anything anymore
+              d = dv[++pos]
+            } else {
+              d[0] = d[0] + diff // reset pos
+              d[1] = d[1] - diff // reset length
+            }
+          }
+        })
+        // for the rest.. just apply it
+        for (; pos < dv.length; pos++) {
+          d = dv[pos]
+          createDeletions(user, d[0], d[1], d[2])
+        }
+      }
+      for (var i in deletions) {
+        var del = deletions[i]
+        var id = [del[0], del[1]]
+        // always try to delete..
+        var addOperation = yield* this.deleteOperation(id)
+        if (addOperation) {
+          // TODO:.. really .. here? You could prevent calling all these functions in operationAdded
+          yield* this.store.operationAdded(this, {struct: 'Delete', target: id})
+        }
+        if (del[2]) {
+          // gc
+          yield* this.garbageCollectOperation(id)
+        }
+      }
+    }
+    * isGarbageCollected (id) {
+      var n = yield* this.ds.findWithUpperBound(id)
+      return n != null && n.id[0] === id[0] && id[1] < n.id[1] + n.len && n.gc
+    }
+    /*
+      A DeleteSet (ds) describes all the deleted ops in the OS
+    */
+    * getDeleteSet () {
+      var ds = {}
+      yield* this.ds.iterate(this, null, null, function * (n) {
+        var user = n.id[0]
+        var counter = n.id[1]
+        var len = n.len
+        var gc = n.gc
+        var dv = ds[user]
+        if (dv === void 0) {
+          dv = []
+          ds[user] = dv
+        }
+        dv.push([counter, len, gc])
+      })
+      return ds
+    }
+    * isDeleted (id) {
+      var n = yield* this.ds.findWithUpperBound(id)
+      return n != null && n.id[0] === id[0] && id[1] < n.id[1] + n.len
+    }
+    * setOperation (op) {
+      yield* this.os.put(op)
+      return op
+    }
+    * addOperation (op) {
+      yield* this.os.put(op)
+    }
+    * getOperation (id) {
+      return yield* this.os.find(id)
+    }
+    * removeOperation (id) {
+      yield* this.os.delete(id)
+    }
+    * setState (state) {
+      var val = {
+        id: [state.user],
+        clock: state.clock
+      }
+      // TODO: find a way to skip this step.. (after implementing some dbs..)
+      if (yield* this.ss.find([state.user])) {
+        yield* this.ss.put(val)
+      } else {
+        yield* this.ss.put(val)
+      }
+    }
+    * getState (user) {
+      var n
+      var clock = (n = yield* this.ss.find([user])) == null ? null : n.clock
+      if (clock == null) {
+        clock = 0
+      }
+      return {
+        user: user,
+        clock: clock
+      }
+    }
+    * getStateVector () {
+      var stateVector = []
+      yield* this.ss.iterate(this, null, null, function * (n) {
+        stateVector.push({
+          user: n.id[0],
+          clock: n.clock
+        })
+      })
+      return stateVector
+    }
+    * getStateSet () {
+      var ss = {}
+      yield* this.ss.iterate(this, null, null, function * (n) {
+        ss[n.id[0]] = n.clock
+      })
+      return ss
+    }
+    * getOperations (startSS) {
+      // TODO: use bounds here!
+      if (startSS == null) {
+        startSS = {}
+      }
+      var ops = []
+
+      var endSV = yield* this.getStateVector()
+      for (var endState of endSV) {
+        var user = endState.user
+        if (user === '_') {
+          continue
+        }
+        var startPos = startSS[user] || 0
+
+        yield* this.os.iterate(this, [user, startPos], [user, Number.MAX_VALUE], function * (op) {
+          ops.push(op)
+        })
+      }
+      var res = []
+      for (var op of ops) {
+        res.push(yield* this.makeOperationReady(startSS, op))
+      }
+      return res
+    }
+    /*
+      Here, we make op executable for the receiving user.
+
+      Notes:
+        startSS: denotes to the SV that the remote user sent
+        currSS:  denotes to the state vector that the user should have if he
+                 applies all already sent operations (increases is each step)
+
+      We face several problems:
+      * Execute op as is won't work because ops depend on each other
+       -> find a way so that they do not anymore
+      * When changing left, must not go more to the left than the origin
+      * When changing right, you have to consider that other ops may have op
+        as their origin, this means that you must not set one of these ops
+        as the new right (interdependencies of ops)
+      * can't just go to the right until you find the first known operation,
+        With currSS
+          -> interdependency of ops is a problem
+        With startSS
+          -> leads to inconsistencies when two users join at the same time.
+             Then the position depends on the order of execution -> error!
+
+        Solution:
+        -> re-create originial situation
+          -> set op.left = op.origin (which never changes)
+          -> set op.right
+               to the first operation that is known (according to startSS)
+               or to the first operation that has an origin that is not to the
+               right of op.
+          -> Enforces unique execution order -> happy user
+
+        Improvements: TODO
+          * Could set left to origin, or the first known operation
+            (startSS or currSS.. ?)
+            -> Could be necessary when I turn GC again.
+            -> Is a bad(ish) idea because it requires more computation
+    */
+    * makeOperationReady (startSS, op) {
+      op = Y.Struct[op.struct].encode(op)
+      op = Y.utils.copyObject(op)
+      var o = op
+      var ids = [op.id]
+      // search for the new op.right
+      // it is either the first known op (according to startSS)
+      // or the o that has no origin to the right of op
+      // (this is why we use the ids array)
+      while (o.right != null) {
+        var right = yield* this.getOperation(o.right)
+        if (o.right[1] < (startSS[o.right[0]] || 0) || !ids.some(function (id) {
+          return Y.utils.compareIds(id, right.origin)
+        })) {
+          break
+        }
+        ids.push(o.right)
+        o = right
+      }
+      op.right = o.right
+      op.left = op.origin
+      return op
+    }
+  }
+  Y.Transaction = Transaction
+}
+
+},{}],6:[function(require,module,exports){
+'use strict'
+
+module.exports = function (Y) {
+  class YMap {
+    constructor (os, model, contents, opContents) {
+      this._model = model.id
+      this.os = os
+      this.map = Y.utils.copyObject(model.map)
+      this.contents = contents
+      this.opContents = opContents
+      this.eventHandler = new Y.utils.EventHandler(ops => {
+        var userEvents = []
+        for (var i in ops) {
+          var op = ops[i]
+          var oldValue
+          // key is the name to use to access (op)content
+          var key = op.struct === 'Delete' ? op.key : op.parentSub
+
+          // compute oldValue
+          if (this.opContents[key] != null) {
+            let prevType = this.opContents[key]
+            oldValue = () => {// eslint-disable-line
+              return new Promise((resolve) => {
+                this.os.requestTransaction(function *() {// eslint-disable-line
+                  resolve(yield* this.getType(prevType))
+                })
+              })
+            }
+          } else {
+            oldValue = this.contents[key]
+          }
+          // compute op event
+          if (op.struct === 'Insert') {
+            if (op.left === null) {
+              if (op.opContent != null) {
+                delete this.contents[key]
+                if (op.deleted) {
+                  delete this.opContents[key]
+                } else {
+                  this.opContents[key] = op.opContent
+                }
+              } else {
+                delete this.opContents[key]
+                if (op.deleted) {
+                  delete this.contents[key]
+                } else {
+                  this.contents[key] = op.content
+                }
+              }
+              this.map[key] = op.id
+              var insertEvent = {
+                name: key,
+                object: this
+              }
+              if (oldValue === undefined) {
+                insertEvent.type = 'add'
+              } else {
+                insertEvent.type = 'update'
+                insertEvent.oldValue = oldValue
+              }
+              userEvents.push(insertEvent)
+            }
+          } else if (op.struct === 'Delete') {
+            if (Y.utils.compareIds(this.map[key], op.target)) {
+              delete this.opContents[key]
+              delete this.contents[key]
+              var deleteEvent = {
+                name: key,
+                object: this,
+                oldValue: oldValue,
+                type: 'delete'
+              }
+              userEvents.push(deleteEvent)
+            }
+          } else {
+            throw new Error('Unexpected Operation!')
+          }
+        }
+        this.eventHandler.callEventListeners(userEvents)
+      })
+    }
+    get (key) {
+      // return property.
+      // if property does not exist, return null
+      // if property is a type, return a promise
+      if (key == null) {
+        throw new Error('You must specify key!')
+      }
+      if (this.opContents[key] == null) {
+        return this.contents[key]
+      } else {
+        return new Promise((resolve) => {
+          var oid = this.opContents[key]
+          this.os.requestTransaction(function *() {
+            resolve(yield* this.getType(oid))
+          })
+        })
+      }
+    }
+    /*
+      If there is a primitive (not a custom type), then return it.
+      Returns all primitive values, if propertyName is specified!
+      Note: modifying the return value could result in inconsistencies!
+        -- so make sure to copy it first!
+    */
+    getPrimitive (key) {
+      if (key == null) {
+        return Y.utils.copyObject(this.contents)
+      } else {
+        return this.contents[key]
+      }
+    }
+    delete (key) {
+      var right = this.map[key]
+      if (right != null) {
+        var del = {
+          target: right,
+          struct: 'Delete'
+        }
+        var eventHandler = this.eventHandler
+        var modDel = Y.utils.copyObject(del)
+        modDel.key = key
+        eventHandler.awaitAndPrematurelyCall([modDel])
+        this.os.requestTransaction(function *() {
+          yield* this.applyCreatedOperations([del])
+          eventHandler.awaitedDeletes(1)
+        })
+      }
+    }
+    set (key, value) {
+      // set property.
+      // if property is a type, return a promise
+      // if not, apply immediately on this type an call event
+
+      var right = this.map[key] || null
+      var insert = {
+        left: null,
+        right: right,
+        origin: null,
+        parent: this._model,
+        parentSub: key,
+        struct: 'Insert'
+      }
+      return new Promise((resolve) => {
+        if (value instanceof Y.utils.CustomType) {
+          // construct a new type
+          this.os.requestTransaction(function *() {
+            var typeid = yield* value.createType.call(this)
+            var type = yield* this.getType(typeid)
+            insert.opContent = typeid
+            insert.id = this.store.getNextOpId()
+            yield* this.applyCreatedOperations([insert])
+            resolve(type)
+          })
+        } else {
+          insert.content = value
+          insert.id = this.os.getNextOpId()
+          var eventHandler = this.eventHandler
+          eventHandler.awaitAndPrematurelyCall([insert])
+
+          this.os.requestTransaction(function *() {
+            yield* this.applyCreatedOperations([insert])
+            eventHandler.awaitedInserts(1)
+          })
+          resolve(value)
+        }
+      })
+    }
+    observe (f) {
+      this.eventHandler.addEventListener(f)
+    }
+    unobserve (f) {
+      this.eventHandler.removeEventListener(f)
+    }
+    /*
+      Observe a path.
+
+      E.g.
+      ```
+      o.set('textarea', Y.TextBind)
+      o.observePath(['textarea'], function(t){
+        // is called whenever textarea is replaced
+        t.bind(textarea)
+      })
+
+      returns a Promise that contains a function that removes the observer from the path.
+    */
+    observePath (path, f) {
+      var self = this
+      function observeProperty (events) {
+        // call f whenever path changes
+        for (var i = 0; i < events.length; i++) {
+          var event = events[i]
+          if (event.name === propertyName) {
+            // call this also for delete events!
+            var property = self.get(propertyName)
+            if (property instanceof Promise) {
+              property.then(f)
+            } else {
+              f(property)
+            }
+          }
+        }
+      }
+
+      if (path.length < 1) {
+        throw new Error('Path must contain at least one element!')
+      } else if (path.length === 1) {
+        var propertyName = path[0]
+        var property = self.get(propertyName)
+        if (property instanceof Promise) {
+          property.then(f)
+        } else {
+          f(property)
+        }
+        this.observe(observeProperty)
+        return Promise.resolve(function () {
+          self.unobserve(f)
+        })
+      } else {
+        var deleteChildObservers
+        var resetObserverPath = function () {
+          var promise = self.get(path[0])
+          if (!promise instanceof Promise) {
+            // its either not defined or a primitive value
+            promise = self.set(path[0], Y.Map)
+          }
+          return promise.then(function (map) {
+            return map.observePath(path.slice(1), f)
+          }).then(function (_deleteChildObservers) {
+            // update deleteChildObservers
+            deleteChildObservers = _deleteChildObservers
+            return Promise.resolve() // Promise does not return anything
+          })
+        }
+        var observer = function (events) {
+          for (var e in events) {
+            var event = events[e]
+            if (event.name === path[0]) {
+              deleteChildObservers()
+              if (event.type === 'add' || event.type === 'update') {
+                resetObserverPath()
+              }
+              // TODO: what about the delete events?
+            }
+          }
+        }
+        self.observe(observer)
+        return resetObserverPath().then(
+          // this promise contains a function that deletes all the child observers
+          // and how to unobserve the observe from this object
+          Promise.resolve(function () {
+            deleteChildObservers()
+            self.unobserve(observer)
+          })
+        )
+      }
+    }
+    * _changed (transaction, op) {
+      if (op.struct === 'Delete') {
+        op.key = (yield* transaction.getOperation(op.target)).parentSub
+      }
+      this.eventHandler.receivedOp(op)
+    }
+  }
+  Y.Map = new Y.utils.CustomType({
+    class: YMap,
+    createType: function * YMapCreator () {
+      var modelid = this.store.getNextOpId()
+      var model = {
+        map: {},
+        struct: 'Map',
+        type: 'Map',
+        id: modelid
+      }
+      yield* this.applyCreatedOperations([model])
+      return modelid
+    },
+    initType: function * YMapInitializer (os, model) {
+      var contents = {}
+      var opContents = {}
+      var map = model.map
+      for (var name in map) {
+        var op = yield* this.getOperation(map[name])
+        if (op.opContent != null) {
+          opContents[name] = op.opContent
+        } else {
+          contents[name] = op.content
+        }
+      }
+      return new YMap(os, model, contents, opContents)
+    }
+  })
+}
+
+},{}],7:[function(require,module,exports){
+'use strict'
+
+/*
+  EventHandler is an helper class for constructing custom types.
+
+  Why: When constructing custom types, you sometimes want your types to work
+  synchronous: E.g.
+  ``` Synchronous
+  mytype.setSomething("yay")
+  mytype.getSomething() === "yay"
+  ```
+  ``` Asynchronous
+  mytype.setSomething("yay")
+  mytype.getSomething() === undefined
+  mytype.waitForSomething().then(function(){
+    mytype.getSomething() === "yay"
+  })
+
+  The structures usually work asynchronously (you have to wait for the
+  database request to finish). EventHandler will help you to make your type
+  synchronously.
+*/
+module.exports = function (Y) {
+  Y.utils = {}
+
+  class EventHandler {
+    /*
+      onevent: is called when the structure changes.
+
+      Note: "awaiting opertations" is used to denote operations that were
+      prematurely called. Events for received operations can not be executed until
+      all prematurely called operations were executed ("waiting operations")
+    */
+    constructor (onevent) {
+      this.waiting = []
+      this.awaiting = 0
+      this.onevent = onevent
+      this.eventListeners = []
+    }
+    /*
+      Call this when a new operation arrives. It will be executed right away if
+      there are no waiting operations, that you prematurely executed
+    */
+    receivedOp (op) {
+      if (this.awaiting <= 0) {
+        this.onevent([op])
+      } else {
+        this.waiting.push(Y.utils.copyObject(op))
+      }
+    }
+    /*
+      You created some operations, and you want the `onevent` function to be
+      called right away. Received operations will not be executed untill all
+      prematurely called operations are executed
+    */
+    awaitAndPrematurelyCall (ops) {
+      this.awaiting++
+      this.onevent(ops)
+    }
+    /*
+      Basic event listener boilerplate...
+      TODO: maybe put this in a different type..
+    */
+    addEventListener (f) {
+      this.eventListeners.push(f)
+    }
+    removeEventListener (f) {
+      this.eventListeners = this.eventListeners.filter(function (g) {
+        return f !== g
+      })
+    }
+    removeAllEventListeners () {
+      this.eventListeners = []
+    }
+    callEventListeners (event) {
+      for (var i in this.eventListeners) {
+        try {
+          this.eventListeners[i](event)
+        } catch (e) {
+          console.log('User events must not throw Errors!') // eslint-disable-line
+        }
+      }
+    }
+    /*
+      Call this when you successfully awaited the execution of n Insert operations
+    */
+    awaitedInserts (n) {
+      var ops = this.waiting.splice(this.waiting.length - n)
+      for (var oid = 0; oid < ops.length; oid++) {
+        var op = ops[oid]
+        for (var i = this.waiting.length - 1; i >= 0; i--) {
+          let w = this.waiting[i]
+          if (Y.utils.compareIds(op.left, w.id)) {
+            // include the effect of op in w
+            w.right = op.id
+            // exclude the effect of w in op
+            op.left = w.left
+          } else if (Y.utils.compareIds(op.right, w.id)) {
+            // similar..
+            w.left = op.id
+            op.right = w.right
+          }
+        }
+      }
+      this._tryCallEvents()
+    }
+    /*
+      Call this when you successfully awaited the execution of n Delete operations
+    */
+    awaitedDeletes (n, newLeft) {
+      var ops = this.waiting.splice(this.waiting.length - n)
+      for (var j in ops) {
+        var del = ops[j]
+        if (newLeft != null) {
+          for (var i in this.waiting) {
+            let w = this.waiting[i]
+            // We will just care about w.left
+            if (Y.utils.compareIds(del.target, w.left)) {
+              del.left = newLeft
+            }
+          }
+        }
+      }
+      this._tryCallEvents()
+    }
+    /* (private)
+      Try to execute the events for the waiting operations
+    */
+    _tryCallEvents () {
+      this.awaiting--
+      if (this.awaiting <= 0 && this.waiting.length > 0) {
+        var events = this.waiting
+        this.waiting = []
+        this.onevent(events)
+      }
+    }
+  }
+  Y.utils.EventHandler = EventHandler
+
+  /*
+    A wrapper for the definition of a custom type.
+    Every custom type must have three properties:
+
+    * createType
+      - Defines the model of a newly created custom type and returns the type
+    * initType
+      - Given a model, creates a custom type
+    * class
+      - the constructor of the custom type (e.g. in order to inherit from a type)
+  */
+  class CustomType { // eslint-disable-line
+    constructor (def) {
+      if (def.createType == null ||
+        def.initType == null ||
+        def.class == null
+      ) {
+        throw new Error('Custom type was not initialized correctly!')
+      }
+      this.createType = def.createType
+      this.initType = def.initType
+      this.class = def.class
+    }
+  }
+  Y.utils.CustomType = CustomType
+
+  /*
+    Make a flat copy of an object
+    (just copy properties)
+  */
+  function copyObject (o) {
+    var c = {}
+    for (var key in o) {
+      c[key] = o[key]
+    }
+    return c
+  }
+  Y.utils.copyObject = copyObject
+
+  /*
+    Defines a smaller relation on Id's
+  */
+  function smaller (a, b) {
+    return a[0] < b[0] || (a[0] === b[0] && a[1] < b[1])
+  }
+  Y.utils.smaller = smaller
+
+  function compareIds (id1, id2) {
+    if (id1 == null || id2 == null) {
+      if (id1 == null && id2 == null) {
+        return true
+      }
+      return false
+    }
+    if (id1[0] === id2[0] && id1[1] === id2[1]) {
+      return true
+    } else {
+      return false
+    }
+  }
+  Y.utils.compareIds = compareIds
+}
+
+},{}],8:[function(require,module,exports){
+/* @flow */
+'use strict'
+
+require('./Connector.js')(Y)
+require('./Database.js')(Y)
+require('./Transaction.js')(Y)
+require('./Struct.js')(Y)
+require('./Utils.js')(Y)
+require('./Connectors/Test.js')(Y)
+
+var requiringModules = {}
+
+module.exports = Y
+
+Y.extend = function (name, value) {
+  Y[name] = value
+  if (requiringModules[name] != null) {
+    requiringModules[name].resolve()
+    delete requiringModules[name]
+  }
+}
+
+Y.requestModules = function (modules) {
+  var promises = []
+  for (var i = 0; i < modules.length; i++) {
+    var modulename = 'y-' + modules[i].toLowerCase()
+    if (Y[modules[i]] == null) {
+      if (requiringModules[modules[i]] == null) {
+        try {
+          require(modulename)(Y)
+        } catch (e) {
+          // module does not exist
+          if (typeof window !== 'undefined') {
+            var imported = document.createElement('script')
+            imported.src = Y.sourceDir + '/' + modulename + '/' + modulename + '.js'
+            document.head.appendChild(imported)
+            ;(function () {
+              var modname = modules[i]
+              var promise = new Promise(function (resolve) {
+                requiringModules[modname] = {
+                  resolve: resolve,
+                  promise: promise
+                }
+              })
+              promises.push(promise)
+            })()
+          } else {
+            throw e
+          }
+        }
+      } else {
+        promises.push(requiringModules[modules[i]].promise)
+      }
+    }
+  }
+  return Promise.all(promises)
+}
+
+require('./Types/Map.js')(Y)
+
+function Y (opts) {
+  opts.types = opts.types != null ? opts.types : []
+  var modules = [opts.db.name, opts.connector.name].concat(opts.types)
+  Y.sourceDir = opts.sourceDir
+  return Y.requestModules(modules).then(function () {
+    return new Promise(function (resolve) {
+      var yconfig = new YConfig(opts, function () {
+        yconfig.db.whenUserIdSet(function () {
+          resolve(yconfig)
+        })
+      })
+    })
+  })
+}
+
+class YConfig {
+  constructor (opts, callback) {
+    this.db = new Y[opts.db.name](this, opts.db)
+    this.connector = new Y[opts.connector.name](this, opts.connector)
+    this.db.requestTransaction(function * requestTransaction () {
+      // create initial Map type
+      var model = {
+        id: ['_', 0],
+        struct: 'Map',
+        type: 'Map',
+        map: {}
+      }
+      yield* this.store.tryExecute.call(this, model)
+      var root = yield* this.getType(model.id)
+      this.store.y.root = root
+      callback()
+    })
+  }
+  isConnected () {
+    return this.connector.isSynced
+  }
+  disconnect () {
+    return this.connector.disconnect()
+  }
+  reconnect () {
+    return this.connector.reconnect()
+  }
+  destroy () {
+    this.disconnect()
+    this.db.destroy()
+    this.connector = null
+    this.db = null
+  }
+}
+
+if (typeof window !== 'undefined') {
+  window.Y = Y
+}
+
+},{"./Connector.js":1,"./Connectors/Test.js":2,"./Database.js":3,"./Struct.js":4,"./Transaction.js":5,"./Types/Map.js":6,"./Utils.js":7}]},{},[8])
+
+
+//# sourceMappingURL=y.js.map
\ No newline at end of file
diff --git a/y.js.map b/y.js.map
index d168895f..4c04c230 100644
--- a/y.js.map
+++ b/y.js.map
@@ -1 +1 @@
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e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require==\"function\"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error(\"Cannot find module '\"+o+\"'\");throw f.code=\"MODULE_NOT_FOUND\",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require==\"function\"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})","'use strict'\n\nmodule.exports = function (Y) {\n  class AbstractConnector {\n    /*\n      opts contains the following information:\n       role : String Role of this client (\"master\" or \"slave\")\n       userId : String Uniquely defines the user.\n       debug: Boolean Whether to print debug messages (optional)\n    */\n    constructor (y, opts) {\n      this.y = y\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.isSynced = false\n      this.userEventListeners = []\n      this.whenSyncedListeners = []\n      this.currentSyncTarget = null\n      this.syncingClients = []\n      this.forwardToSyncingClients = opts.forwardToSyncingClients !== false\n      this.debug = opts.debug === true\n      this.broadcastedHB = false\n      this.syncStep2 = Promise.resolve()\n    }\n    reconnect () {\n    }\n    disconnect () {\n      this.connections = {}\n      this.isSynced = false\n      this.currentSyncTarget = null\n      this.broadcastedHB = false\n      this.syncingClients = []\n      this.whenSyncedListeners = []\n      return this.y.db.stopGarbageCollector()\n    }\n    setUserId (userId) {\n      this.userId = userId\n      return this.y.db.setUserId(userId)\n    }\n    onUserEvent (f) {\n      this.userEventListeners.push(f)\n    }\n    userLeft (user) {\n      delete this.connections[user]\n      if (user === this.currentSyncTarget) {\n        this.currentSyncTarget = null\n        this.findNextSyncTarget()\n      }\n      this.syncingClients = this.syncingClients.filter(function (cli) {\n        return cli !== user\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      if (this.currentSyncTarget == null) {\n        this.findNextSyncTarget()\n      }\n    }\n    // Execute a function _when_ we are connected.\n    // If not connected, wait until connected\n    whenSynced (f) {\n      if (this.isSynced) {\n        f()\n      } else {\n        this.whenSyncedListeners.push(f)\n      }\n    }\n    /*\n\n     returns false, if there is no sync target\n     true otherwise\n    */\n    findNextSyncTarget () {\n      if (this.currentSyncTarget != null || this.isSynced) {\n        return // \"The current sync has not finished!\"\n      }\n\n      var syncUser = null\n      for (var uid in this.connections) {\n        if (!this.connections[uid].isSynced) {\n          syncUser = uid\n          break\n        }\n      }\n      if (syncUser != null) {\n        var conn = this\n        this.currentSyncTarget = syncUser\n        this.y.db.requestTransaction(function *() {\n          conn.send(syncUser, {\n            type: 'sync step 1',\n            stateSet: yield* this.getStateSet(),\n            deleteSet: yield* this.getDeleteSet()\n          })\n        })\n      } else {\n        this.isSynced = true\n        // call when synced listeners\n        for (var f of this.whenSyncedListeners) {\n          f()\n        }\n        this.whenSyncedListeners = []\n        this.y.db.requestTransaction(function *() {\n          yield* this.garbageCollectAfterSync()\n        })\n      }\n    }\n    send (uid, message) {\n      if (this.debug) {\n        console.log(`send ${this.userId} -> ${uid}: ${message.type}`, m) // eslint-disable-line\n      }\n    }\n    /*\n      You received a raw message, and you know that it is intended for Yjs. Then call this function.\n    */\n    receiveMessage (sender, m) {\n      if (sender === this.userId) {\n        return\n      }\n      if (this.debug) {\n        console.log(`receive ${sender} -> ${this.userId}: ${m.type}`, JSON.parse(JSON.stringify(m))) // eslint-disable-line\n      }\n      if (m.type === 'sync step 1') {\n        // TODO: make transaction, stream the ops\n        let conn = this\n        this.y.db.requestTransaction(function *() {\n          var currentStateSet = yield* this.getStateSet()\n          yield* this.applyDeleteSet(m.deleteSet)\n\n          var ds = yield* this.getDeleteSet()\n          var ops = yield* this.getOperations(m.stateSet)\n          conn.send(sender, {\n            type: 'sync step 2',\n            os: ops,\n            stateSet: currentStateSet,\n            deleteSet: ds\n          })\n          if (this.forwardToSyncingClients) {\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          } else {\n            conn.send(sender, {\n              type: 'sync done'\n            })\n          }\n          conn._setSyncedWith(sender)\n        })\n      } else if (m.type === 'sync step 2') {\n        let conn = this\n        var broadcastHB = !this.broadcastedHB\n        this.broadcastedHB = true\n        var db = this.y.db\n        this.syncStep2 = new Promise(function (resolve) {\n          db.requestTransaction(function * () {\n            yield* this.applyDeleteSet(m.deleteSet)\n            this.store.apply(m.os)\n            db.requestTransaction(function * () {\n              var ops = yield* this.getOperations(m.stateSet)\n              if (ops.length > 0) {\n                m = {\n                  type: 'update',\n                  ops: ops\n                }\n                if (!broadcastHB) { // TODO: consider to broadcast here..\n                  conn.send(sender, m)\n                } else {\n                  // broadcast only once!\n                  conn.broadcast(m)\n                }\n              }\n              resolve()\n            })\n          })\n        })\n      } else if (m.type === 'sync done') {\n        var self = this\n        this.syncStep2.then(function () {\n          self._setSyncedWith(sender)\n        })\n      } else if (m.type === 'update') {\n        if (this.forwardToSyncingClients) {\n          for (var client of this.syncingClients) {\n            this.send(client, m)\n          }\n        }\n        this.y.db.apply(m.ops)\n      }\n    }\n    _setSyncedWith (user) {\n      var conn = this.connections[user]\n      if (conn != null) {\n        conn.isSynced = true\n      }\n      if (user === this.currentSyncTarget) {\n        this.currentSyncTarget = null\n        this.findNextSyncTarget()\n      }\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    */\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, 10)\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    /*\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    */\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  Y.AbstractConnector = AbstractConnector\n}\n","/* global getRandom, wait, async */\n'use strict'\n\nmodule.exports = function (Y) {\n  var globalRoom = {\n    users: {},\n    buffers: {},\n    removeUser: function (user) {\n      for (var i in this.users) {\n        this.users[i].userLeft(user)\n      }\n      delete this.users[user]\n      delete this.buffers[user]\n    },\n    addUser: function (connector) {\n      this.users[connector.userId] = connector\n      this.buffers[connector.userId] = []\n      for (var uname in this.users) {\n        if (uname !== connector.userId) {\n          var u = this.users[uname]\n          u.userJoined(connector.userId, 'master')\n          connector.userJoined(u.userId, 'master')\n        }\n      }\n    }\n  }\n  Y.utils.globalRoom = globalRoom\n\n  function flushOne () {\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].shift()\n      var user = globalRoom.users[userId]\n      user.receiveMessage(m[0], m[1])\n      return true\n    } else {\n      return false\n    }\n  }\n\n  // setInterval(flushOne, 10)\n\n  var userIdCounter = 0\n\n  class Test extends Y.AbstractConnector {\n    constructor (y, options) {\n      if (options === undefined) {\n        throw new Error('Options must not be undefined!')\n      }\n      options.role = 'master'\n      options.forwardToSyncingClients = false\n      super(y, options)\n      this.setUserId((userIdCounter++) + '').then(() => {\n        globalRoom.addUser(this)\n      })\n      this.globalRoom = globalRoom\n      this.syncingClientDuration = 0\n    }\n    receiveMessage (sender, m) {\n      super.receiveMessage(sender, JSON.parse(JSON.stringify(m)))\n    }\n    send (userId, message) {\n      var buffer = globalRoom.buffers[userId]\n      if (buffer != null) {\n        buffer.push(JSON.parse(JSON.stringify([this.userId, message])))\n      }\n    }\n    broadcast (message) {\n      for (var key in globalRoom.buffers) {\n        globalRoom.buffers[key].push(JSON.parse(JSON.stringify([this.userId, message])))\n      }\n    }\n    isDisconnected () {\n      return globalRoom.users[this.userId] == null\n    }\n    reconnect () {\n      if (this.isDisconnected()) {\n        globalRoom.addUser(this)\n        super.reconnect()\n      }\n      return this.flushAll()\n    }\n    disconnect () {\n      if (!this.isDisconnected()) {\n        globalRoom.removeUser(this.userId)\n        super.disconnect()\n      }\n      return wait()\n    }\n    flush () {\n      var self = this\n      return async(function * () {\n        yield wait()\n        while (globalRoom.buffers[self.userId].length > 0) {\n          var m = globalRoom.buffers[self.userId].shift()\n          this.receiveMessage(m[0], m[1])\n          yield wait()\n        }\n      })\n    }\n    flushAll () {\n      return new Promise(function (resolve) {\n        // flushes may result in more created operations,\n        // flush until there is nothing more to flush\n        function nextFlush () {\n          var c = flushOne()\n          if (c) {\n            while (flushOne()) {\n              // nop\n            }\n            wait().then(nextFlush)\n          } else {\n            wait().then(function () {\n              resolve()\n            })\n          }\n        }\n        // in the case that there are\n        // still actions that want to be performed\n        wait().then(nextFlush)\n      })\n    }\n    /*\n      Flushes an operation for some user..\n    */\n    flushOne () {\n      flushOne()\n    }\n  }\n\n  Y.Test = Test\n}\n","'use strict'\n\nmodule.exports = function (Y) {\n  /*\n    Partial definition of an OperationStore.\n    TODO: name it Database, operation store only holds operations.\n\n    A database definition must alse define the following methods:\n    * logTable() (optional)\n      - show relevant information information in a table\n    * requestTransaction(makeGen)\n      - request a transaction\n    * destroy()\n      - destroy the database\n  */\n  class AbstractDatabase {\n    constructor (y, opts) {\n      this.y = y\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\n        a property before you iterate over it!\n      */\n      // TODO: Use ES7 Weak Maps. This way types that are no longer user,\n      // wont be kept in memory.\n      this.initializedTypes = {}\n      this.whenUserIdSetListener = null\n      this.waitingTransactions = []\n      this.transactionInProgress = false\n      if (typeof YConcurrency_TestingMode !== 'undefined') {\n        this.executeOrder = []\n      }\n      this.gc1 = [] // first stage\n      this.gc2 = [] // second stage -> after that, remove the op\n      this.gcTimeout = opts.gcTimeout || 5000\n      var os = this\n      function garbageCollect () {\n        return new Promise((resolve) => {\n          os.requestTransaction(function * () {\n            if (os.y.connector != null && os.y.connector.isSynced) {\n              for (var i in os.gc2) {\n                var oid = os.gc2[i]\n                yield* this.garbageCollectOperation(oid)\n              }\n              os.gc2 = os.gc1\n              os.gc1 = []\n            }\n            if (os.gcTimeout > 0) {\n              os.gcInterval = setTimeout(garbageCollect, os.gcTimeout)\n            }\n            resolve()\n          })\n        })\n      }\n      this.garbageCollect = garbageCollect\n      if (this.gcTimeout > 0) {\n        garbageCollect()\n      }\n    }\n    addToDebug () {\n      if (typeof YConcurrency_TestingMode !== 'undefined') {\n        var command = Array.prototype.map.call(arguments, function (s) {\n          if (typeof s === 'string') {\n            return s\n          } else {\n            return JSON.stringify(s)\n          }\n        }).join('').replace(/\"/g, \"'\").replace(/,/g, ', ').replace(/:/g, ': ')\n        this.executeOrder.push(command)\n      }\n    }\n    getDebugData () {\n      console.log(this.executeOrder.join('\\n'))\n    }\n    stopGarbageCollector () {\n      var self = this\n      return new Promise(function (resolve) {\n        self.requestTransaction(function * () {\n          var ungc = self.gc1.concat(self.gc2)\n          self.gc1 = []\n          self.gc2 = []\n          for (var i in ungc) {\n            var op = yield* this.getOperation(ungc[i])\n            delete op.gc\n            yield* this.setOperation(op)\n          }\n          resolve()\n        })\n      })\n    }\n    /*\n      Try to add to GC.\n\n      TODO: rename this function\n\n      Rulez:\n      * Only gc if this user is online\n      * The most left element in a list must not be gc'd.\n        => There is at least one element in the list\n\n      returns true iff op was added to GC\n    */\n    addToGarbageCollector (op, left) {\n      if (\n        op.gc == null &&\n        op.deleted === true &&\n        this.y.connector.isSynced &&\n        left != null &&\n        left.deleted === true\n      ) {\n        op.gc = true\n        this.gc1.push(op.id)\n        return true\n      } else {\n        return false\n      }\n    }\n    removeFromGarbageCollector (op) {\n      function filter (o) {\n        return !Y.utils.compareIds(o, op.id)\n      }\n      this.gc1 = this.gc1.filter(filter)\n      this.gc2 = this.gc2.filter(filter)\n      delete op.gc\n    }\n    destroy () {\n      clearInterval(this.gcInterval)\n      this.gcInterval = null\n    }\n    setUserId (userId) {\n      var self = this\n      return new Promise(function (resolve) {\n        self.requestTransaction(function * () {\n          self.userId = userId\n          self.opClock = (yield* this.getState(userId)).clock\n          if (self.whenUserIdSetListener != null) {\n            self.whenUserIdSetListener()\n            self.whenUserIdSetListener = null\n          }\n          resolve()\n        })\n      })\n    }\n    whenUserIdSet (f) {\n      if (this.userId != null) {\n        f()\n      } else {\n        this.whenUserIdSetListener = f\n      }\n    }\n    getNextOpId () {\n      if (this.userId == null) {\n        throw new Error('OperationStore not yet initialized!')\n      }\n      return [this.userId, this.opClock++]\n    }\n    /*\n      Apply a list of operations.\n\n      * get a transaction\n      * check whether all Struct.*.requiredOps are in the OS\n      * check if it is an expected op (otherwise wait for it)\n      * check if was deleted, apply a delete operation after op was applied\n    */\n    apply (ops) {\n      for (var key in ops) {\n        var o = ops[key]\n        var required = Y.Struct[o.struct].requiredOps(o)\n        this.whenOperationsExist(required, o)\n      }\n    }\n    /*\n      op is executed as soon as every operation requested is available.\n      Note that Transaction can (and should) buffer requests.\n    */\n    whenOperationsExist (ids, op) {\n      if (ids.length > 0) {\n        let listener = {\n          op: op,\n          missing: ids.length\n        }\n\n        for (let key in ids) {\n          let id = ids[key]\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          op: op\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 key in exeNow) {\n          let o = exeNow[key].op\n          yield* store.tryExecute.call(this, o)\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 key in l) {\n              let listener = l[key]\n              let o = listener.op\n              if (--listener.missing === 0) {\n                yield* store.tryExecute.call(this, o)\n              }\n            }\n          }\n        }\n      })\n    }\n    /*\n      Actually execute an operation, when all expected operations are available.\n    */\n    * tryExecute (op) {\n      this.store.addToDebug('yield* this.store.tryExecute.call(this, ', JSON.stringify(op), ')')\n      if (op.struct === 'Delete') {\n        yield* Y.Struct.Delete.execute.call(this, op)\n        yield* this.store.operationAdded(this, op)\n      } else if ((yield* this.getOperation(op.id)) == null && !(yield* this.isGarbageCollected(op.id))) {\n        yield* Y.Struct[op.struct].execute.call(this, op)\n        yield* this.addOperation(op)\n        yield* this.store.operationAdded(this, op)\n      }\n    }\n    // called by a transaction when an operation is added\n    * operationAdded (transaction, op) {\n      if (op.struct === 'Delete') {\n        var target = yield* transaction.getOperation(op.target)\n        if (target != null) {\n          var type = transaction.store.initializedTypes[JSON.stringify(target.parent)]\n          if (type != null) {\n            yield* type._changed(transaction, {\n              struct: 'Delete',\n              target: op.target\n            })\n          }\n        }\n      } else {\n        // increase SS\n        var o = op\n        var state = yield* transaction.getState(op.id[0])\n        while (o != null && o.id[1] === state.clock && op.id[0] === o.id[0]) {\n          // either its a new operation (1. case), or it is an operation that was deleted, but is not yet in the OS\n          state.clock++\n          yield* transaction.checkDeleteStoreForState(state)\n          o = yield* transaction.os.findNext(o.id)\n        }\n        yield* transaction.setState(state)\n\n        // notify whenOperation listeners (by id)\n        var sid = JSON.stringify(op.id)\n        var l = this.listenersById[sid]\n        delete this.listenersById[sid]\n\n        if (l != null) {\n          for (var key in l) {\n            var listener = l[key]\n            if (--listener.missing === 0) {\n              this.whenOperationsExist([], listener.op)\n            }\n          }\n        }\n        var t = this.initializedTypes[JSON.stringify(op.parent)]\n        // notify parent, if it has been initialized as a custom type\n        if (t != null) {\n          yield* t._changed(transaction, Y.utils.copyObject(op))\n        }\n\n        // Delete if DS says this is actually deleted\n        if (!op.deleted && (yield* transaction.isDeleted(op.id))) {\n          var delop = {\n            struct: 'Delete',\n            target: op.id\n          }\n          yield* Y.Struct['Delete'].execute.call(transaction, delop)\n          if (t != null) {\n            yield* t._changed(transaction, delop)\n          }\n        }\n      }\n    }\n    getNextRequest () {\n      if (this.waitingTransactions.length === 0) {\n        this.transactionInProgress = false\n        return null\n      } else {\n        return this.waitingTransactions.shift()\n      }\n    }\n    requestTransaction (makeGen, callImmediately) {\n      if (callImmediately) {\n        this.transact(makeGen)\n      } else if (!this.transactionInProgress) {\n        this.transactionInProgress = true\n        var self = this\n        setTimeout(function () {\n          self.transact(makeGen)\n        }, 0)\n      } else {\n        this.waitingTransactions.push(makeGen)\n      }\n    }\n  }\n  Y.AbstractDatabase = AbstractDatabase\n}\n","'use strict'\n\nmodule.exports = function (Y) {\n  class Store {\n    constructor (transaction, name) {\n      this.store = transaction.objectStore(name)\n    }\n    * find (id) {\n      return yield this.store.get(id)\n    }\n    * put (v) {\n      yield this.store.put(v)\n    }\n    * delete (id) {\n      yield this.store.delete(id)\n    }\n    * findWithLowerBound (start) {\n      return yield this.store.openCursor(window.IDBKeyRange.lowerBound(start))\n    }\n    * findWithUpperBound (end) {\n      return yield this.store.openCursor(window.IDBKeyRange.upperBound(end), 'prev')\n    }\n    * findNext (id) {\n      return yield* this.findWithLowerBound([id[0], id[1] + 1])\n    }\n    * findPrev (id) {\n      return yield* this.findWithUpperBound([id[0], id[1] - 1])\n    }\n    * iterate (t, start, end, gen) {\n      var range = null\n      if (start != null && end != null) {\n        range = window.IDBKeyRange.bound(start, end)\n      } else if (start != null) {\n        range = window.IDBKeyRange.lowerBound(start)\n      } else if (end != null) {\n        range = window.IDBKeyRange.upperBound(end)\n      }\n      var cursorResult = this.store.openCursor(range)\n      while ((yield cursorResult) != null) {\n        yield* gen.call(t, cursorResult.result.value)\n        cursorResult.result.continue()\n      }\n    }\n\n  }\n  class Transaction extends Y.Transaction {\n    constructor (store) {\n      super(store)\n      var transaction = store.db.transaction(['OperationStore', 'StateStore', 'DeleteStore'], 'readwrite')\n      this.store = store\n      this.ss = new Store(transaction, 'StateStore')\n      this.os = new Store(transaction, 'OperationStore')\n      this.ds = new Store(transaction, 'DeleteStore')\n    }\n  }\n  class OperationStore extends Y.AbstractDatabase {\n    constructor (y, opts) {\n      super(y, opts)\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      if (opts.idbVersion != null) {\n        this.idbVersion = opts.idbVersion\n      } else {\n        this.idbVersion = 5\n      }\n      var store = this\n      // initialize database!\n      this.requestTransaction(function * () {\n        store.db = yield window.indexedDB.open(opts.namespace, store.idbVersion)\n      })\n      if (opts.cleanStart) {\n        this.requestTransaction(function * () {\n          yield this.os.store.clear()\n          yield this.ds.store.clear()\n          yield this.ss.store.clear()\n        })\n      }\n      var operationsToAdd = []\n      window.addEventListener('storage', function (event) {\n        if (event.key === '__YJS__' + store.namespace) {\n          operationsToAdd.push(event.newValue)\n          if (operationsToAdd.length === 1) {\n            store.requestTransaction(function * () {\n              var add = operationsToAdd\n              operationsToAdd = []\n              for (var i in add) {\n                // don't call the localStorage event twice..\n                var op = JSON.parse(add[i])\n                if (op.struct !== 'Delete') {\n                  op = yield* this.getOperation(op.id)\n                }\n                yield* this.store.operationAdded(this, op, true)\n              }\n            })\n          }\n        }\n      }, false)\n    }\n    * operationAdded (transaction, op, noAdd) {\n      yield* super.operationAdded(transaction, op)\n      if (!noAdd) {\n        window.localStorage['__YJS__' + this.namespace] = JSON.stringify(op)\n      }\n    }\n    transact (makeGen) {\n      var transaction = this.db != null ? new Transaction(this) : null\n      var store = this\n\n      var gen = makeGen.call(transaction)\n      handleTransactions(gen.next())\n\n      function handleTransactions (result) {\n        var request = result.value\n        if (result.done) {\n          makeGen = store.getNextRequest()\n          if (makeGen != null) {\n            if (transaction == null && store.db != null) {\n              transaction = new Transaction(store)\n            }\n            gen = makeGen.call(transaction)\n            handleTransactions(gen.next())\n          } // else no transaction in progress!\n          return\n        }\n        if (request.constructor === window.IDBRequest) {\n          request.onsuccess = function () {\n            var res = request.result\n            if (res != null && res.constructor === window.IDBCursorWithValue) {\n              res = res.value\n            }\n            handleTransactions(gen.next(res))\n          }\n          request.onerror = function (err) {\n            gen.throw(err)\n          }\n        } else if (request.constructor === window.IDBCursor) {\n          request.onsuccess = function () {\n            handleTransactions(gen.next(request.result != null ? request.result.value : null))\n          }\n          request.onerror = function (err) {\n            gen.throw(err)\n          }\n        } else if (request.constructor === window.IDBOpenDBRequest) {\n          request.onsuccess = function (event) {\n            var db = event.target.result\n            handleTransactions(gen.next(db))\n          }\n          request.onerror = function () {\n            gen.throw(\"Couldn't open IndexedDB database!\")\n          }\n          request.onupgradeneeded = function (event) {\n            var db = event.target.result\n            try {\n              db.createObjectStore('OperationStore', {keyPath: 'id'})\n              db.createObjectStore('DeleteStore', {keyPath: 'id'})\n              db.createObjectStore('StateStore', {keyPath: 'id'})\n            } catch (e) {\n              console.log('Store already exists!')\n            }\n          }\n        } else {\n          gen.throw('You must not yield this type!')\n        }\n      }\n    }\n    // TODO: implement \"free\"..\n    * destroy () {\n      this.db.close()\n      yield window.indexedDB.deleteDatabase(this.namespace)\n    }\n  }\n  Y.IndexedDB = OperationStore\n}\n","'use strict'\n\nmodule.exports = function (Y) {\n  class Transaction extends Y.Transaction {\n    constructor (store) {\n      super(store)\n      this.store = store\n      this.ss = store.ss\n      this.os = store.os\n      this.ds = store.ds\n    }\n  }\n  class Database extends Y.AbstractDatabase {\n    constructor (y, opts) {\n      super(y, opts)\n      this.os = new Y.utils.RBTree()\n      this.ds = new Y.utils.RBTree()\n      this.ss = new Y.utils.RBTree()\n    }\n    logTable () {\n      var self = this\n      self.requestTransaction(function * () {\n        console.log('User: ', this.store.y.connector.userId, \"==============================\") // eslint-disable-line\n        console.log(\"State Set (SS):\", yield* this.getStateSet()) // eslint-disable-line\n        console.log(\"Operation Store (OS):\") // eslint-disable-line\n        yield* this.os.logTable() // eslint-disable-line\n        console.log(\"Deletion Store (DS):\") //eslint-disable-line\n        yield* this.ds.logTable() // eslint-disable-line\n        if (this.store.gc1.length > 0 || this.store.gc2.length > 0) {\n          console.warn('GC1|2 not empty!', this.store.gc1, this.store.gc2)\n        }\n        if (JSON.stringify(this.store.listenersById) !== '{}') {\n          console.warn('listenersById not empty!')\n        }\n        if (JSON.stringify(this.store.listenersByIdExecuteNow) !== '[]') {\n          console.warn('listenersByIdExecuteNow not empty!')\n        }\n        if (this.store.transactionInProgress) {\n          console.warn('Transaction still in progress!')\n        }\n      }, true)\n    }\n    transact (makeGen) {\n      var t = new Transaction(this)\n      while (makeGen !== null) {\n        var gen = makeGen.call(t)\n        var res = gen.next()\n        while (!res.done) {\n          res = gen.next(res.value)\n        }\n        makeGen = this.getNextRequest()\n      }\n    }\n    * destroy () {\n      super.destroy()\n      delete this.os\n      delete this.ss\n      delete this.ds\n    }\n  }\n  Y.Memory = Database\n}\n","'use strict'\n\n/*\n  This file contains a not so fancy implemantion of a Red Black Tree.\n*/\n\nmodule.exports = function (Y) {\n  class N {\n    // A created node is always red!\n    constructor (val) {\n      this.val = val\n      this.color = true\n      this._left = null\n      this._right = null\n      this._parent = null\n      if (val.id === null) {\n        throw new Error('You must define id!')\n      }\n    }\n    isRed () { return this.color }\n    isBlack () { return !this.color }\n    redden () { this.color = true; return this }\n    blacken () { this.color = false; return this }\n    get grandparent () {\n      return this.parent.parent\n    }\n    get parent () {\n      return this._parent\n    }\n    get sibling () {\n      return (this === this.parent.left)\n        ? this.parent.right : this.parent.left\n    }\n    get left () {\n      return this._left\n    }\n    get right () {\n      return this._right\n    }\n    set left (n) {\n      if (n !== null) {\n        n._parent = this\n      }\n      this._left = n\n    }\n    set right (n) {\n      if (n !== null) {\n        n._parent = this\n      }\n      this._right = n\n    }\n    rotateLeft (tree) {\n      var parent = this.parent\n      var newParent = this.right\n      var newRight = this.right.left\n      newParent.left = this\n      this.right = newRight\n      if (parent === null) {\n        tree.root = newParent\n        newParent._parent = null\n      } else if (parent.left === this) {\n        parent.left = newParent\n      } else if (parent.right === this) {\n        parent.right = newParent\n      } else {\n        throw new Error('The elements are wrongly connected!')\n      }\n    }\n    next () {\n      if (this.right !== null) {\n        // search the most left node in the right tree\n        var o = this.right\n        while (o.left !== null) {\n          o = o.left\n        }\n        return o\n      } else {\n        var p = this\n        while (p.parent !== null && p !== p.parent.left) {\n          p = p.parent\n        }\n        return p.parent\n      }\n    }\n    prev () {\n      if (this.left !== null) {\n        // search the most right node in the left tree\n        var o = this.left\n        while (o.right !== null) {\n          o = o.right\n        }\n        return o\n      } else {\n        var p = this\n        while (p.parent !== null && p !== p.parent.right) {\n          p = p.parent\n        }\n        return p.parent\n      }\n    }\n    rotateRight (tree) {\n      var parent = this.parent\n      var newParent = this.left\n      var newLeft = this.left.right\n      newParent.right = this\n      this.left = newLeft\n      if (parent === null) {\n        tree.root = newParent\n        newParent._parent = null\n      } else if (parent.left === this) {\n        parent.left = newParent\n      } else if (parent.right === this) {\n        parent.right = newParent\n      } else {\n        throw new Error('The elements are wrongly connected!')\n      }\n    }\n    getUncle () {\n      // we can assume that grandparent exists when this is called!\n      if (this.parent === this.parent.parent.left) {\n        return this.parent.parent.right\n      } else {\n        return this.parent.parent.left\n      }\n    }\n  }\n\n  class RBTree {\n    constructor () {\n      this.root = null\n      this.length = 0\n    }\n    * findNext (id) {\n      return yield* this.findWithLowerBound([id[0], id[1] + 1])\n    }\n    * findPrev (id) {\n      return yield* this.findWithUpperBound([id[0], id[1] - 1])\n    }\n    findNodeWithLowerBound (from) {\n      if (from === void 0) {\n        throw new Error('You must define from!')\n      }\n      var o = this.root\n      if (o === null) {\n        return null\n      } else {\n        while (true) {\n          if ((from === null || Y.utils.smaller(from, o.val.id)) && o.left !== null) {\n            // o is included in the bound\n            // try to find an element that is closer to the bound\n            o = o.left\n          } else if (from !== null && Y.utils.smaller(o.val.id, from)) {\n            // o is not within the bound, maybe one of the right elements is..\n            if (o.right !== null) {\n              o = o.right\n            } else {\n              // there is no right element. Search for the next bigger element,\n              // this should be within the bounds\n              return o.next()\n            }\n          } else {\n            return o\n          }\n        }\n      }\n    }\n    findNodeWithUpperBound (to) {\n      if (to === void 0) {\n        throw new Error('You must define from!')\n      }\n      var o = this.root\n      if (o === null) {\n        return null\n      } else {\n        while (true) {\n          if ((to === null || Y.utils.smaller(o.val.id, to)) && o.right !== null) {\n            // o is included in the bound\n            // try to find an element that is closer to the bound\n            o = o.right\n          } else if (to !== null && Y.utils.smaller(to, o.val.id)) {\n            // o is not within the bound, maybe one of the left elements is..\n            if (o.left !== null) {\n              o = o.left\n            } else {\n              // there is no left element. Search for the prev smaller element,\n              // this should be within the bounds\n              return o.prev()\n            }\n          } else {\n            return o\n          }\n        }\n      }\n    }\n    * findWithLowerBound (from) {\n      var n = this.findNodeWithLowerBound(from)\n      return n == null ? null : n.val\n    }\n    * findWithUpperBound (to) {\n      var n = this.findNodeWithUpperBound(to)\n      return n == null ? null : n.val\n    }\n    * iterate (t, from, to, f) {\n      var o = this.findNodeWithLowerBound(from)\n      while (o !== null && (to === null || Y.utils.smaller(o.val.id, to) || Y.utils.compareIds(o.val.id, to))) {\n        yield* f.call(t, o.val)\n        o = o.next()\n      }\n      return true\n    }\n    * logTable (from, to, filter) {\n      if (filter == null) {\n        filter = function () {\n          return true\n        }\n      }\n      if (from == null) { from = null }\n      if (to == null) { to = null }\n      var os = []\n      yield* this.iterate(this, from, to, function * (o) {\n        if (filter(o)) {\n          var o_ = {}\n          for (var key in o) {\n            if (typeof o[key] === 'object') {\n              o_[key] = JSON.stringify(o[key])\n            } else {\n              o_[key] = o[key]\n            }\n          }\n          os.push(o_)\n        }\n      })\n      if (console.table != null) {\n        console.table(os)\n      }\n    }\n    * find (id) {\n      var n\n      return (n = this.findNode(id)) ? n.val : null\n    }\n    findNode (id) {\n      if (id == null || id.constructor !== Array) {\n        throw new Error('Expect id to be an array!')\n      }\n      var o = this.root\n      if (o === null) {\n        return false\n      } else {\n        while (true) {\n          if (o === null) {\n            return false\n          }\n          if (Y.utils.smaller(id, o.val.id)) {\n            o = o.left\n          } else if (Y.utils.smaller(o.val.id, id)) {\n            o = o.right\n          } else {\n            return o\n          }\n        }\n      }\n    }\n    * delete (id) {\n      if (id == null || id.constructor !== Array) {\n        throw new Error('id is expected to be an Array!')\n      }\n      var d = this.findNode(id)\n      if (d == null) {\n        throw new Error('Element does not exist!')\n      }\n      this.length--\n      if (d.left !== null && d.right !== null) {\n        // switch d with the greates element in the left subtree.\n        // o should have at most one child.\n        var o = d.left\n        // find\n        while (o.right !== null) {\n          o = o.right\n        }\n        // switch\n        d.val = o.val\n        d = o\n      }\n      // d has at most one child\n      // let n be the node that replaces d\n      var isFakeChild\n      var child = d.left || d.right\n      if (child === null) {\n        isFakeChild = true\n        child = new N({id: 0})\n        child.blacken()\n        d.right = child\n      } else {\n        isFakeChild = false\n      }\n\n      if (d.parent === null) {\n        if (!isFakeChild) {\n          this.root = child\n          child.blacken()\n          child._parent = null\n        } else {\n          this.root = null\n        }\n        return\n      } else if (d.parent.left === d) {\n        d.parent.left = child\n      } else if (d.parent.right === d) {\n        d.parent.right = child\n      } else {\n        throw new Error('Impossible!')\n      }\n      if (d.isBlack()) {\n        if (child.isRed()) {\n          child.blacken()\n        } else {\n          this._fixDelete(child)\n        }\n      }\n      this.root.blacken()\n      if (isFakeChild) {\n        if (child.parent.left === child) {\n          child.parent.left = null\n        } else if (child.parent.right === child) {\n          child.parent.right = null\n        } else {\n          throw new Error('Impossible #3')\n        }\n      }\n    }\n    _fixDelete (n) {\n      function isBlack (node) {\n        return node !== null ? node.isBlack() : true\n      }\n      function isRed (node) {\n        return node !== null ? node.isRed() : false\n      }\n      if (n.parent === null) {\n        // this can only be called after the first iteration of fixDelete.\n        return\n      }\n      // d was already replaced by the child\n      // d is not the root\n      // d and child are black\n      var sibling = n.sibling\n      if (isRed(sibling)) {\n        // make sibling the grandfather\n        n.parent.redden()\n        sibling.blacken()\n        if (n === n.parent.left) {\n          n.parent.rotateLeft(this)\n        } else if (n === n.parent.right) {\n          n.parent.rotateRight(this)\n        } else {\n          throw new Error('Impossible #2')\n        }\n        sibling = n.sibling\n      }\n      // parent, sibling, and children of n are black\n      if (n.parent.isBlack() &&\n        sibling.isBlack() &&\n        isBlack(sibling.left) &&\n        isBlack(sibling.right)\n      ) {\n        sibling.redden()\n        this._fixDelete(n.parent)\n      } else if (n.parent.isRed() &&\n        sibling.isBlack() &&\n        isBlack(sibling.left) &&\n        isBlack(sibling.right)\n      ) {\n        sibling.redden()\n        n.parent.blacken()\n      } else {\n        if (n === n.parent.left &&\n          sibling.isBlack() &&\n          isRed(sibling.left) &&\n          isBlack(sibling.right)\n        ) {\n          sibling.redden()\n          sibling.left.blacken()\n          sibling.rotateRight(this)\n          sibling = n.sibling\n        } else if (n === n.parent.right &&\n          sibling.isBlack() &&\n          isRed(sibling.right) &&\n          isBlack(sibling.left)\n        ) {\n          sibling.redden()\n          sibling.right.blacken()\n          sibling.rotateLeft(this)\n          sibling = n.sibling\n        }\n        sibling.color = n.parent.color\n        n.parent.blacken()\n        if (n === n.parent.left) {\n          sibling.right.blacken()\n          n.parent.rotateLeft(this)\n        } else {\n          sibling.left.blacken()\n          n.parent.rotateRight(this)\n        }\n      }\n    }\n    * put (v) {\n      if (v == null || v.id == null || v.id.constructor !== Array) {\n        throw new Error('v is expected to have an id property which is an Array!')\n      }\n      var node = new N(v)\n      if (this.root !== null) {\n        var p = this.root // p abbrev. parent\n        while (true) {\n          if (Y.utils.smaller(node.val.id, p.val.id)) {\n            if (p.left === null) {\n              p.left = node\n              break\n            } else {\n              p = p.left\n            }\n          } else if (Y.utils.smaller(p.val.id, node.val.id)) {\n            if (p.right === null) {\n              p.right = node\n              break\n            } else {\n              p = p.right\n            }\n          } else {\n            p.val = node.val\n            return p\n          }\n        }\n        this._fixInsert(node)\n      } else {\n        this.root = node\n      }\n      this.length++\n      this.root.blacken()\n      return node\n    }\n    _fixInsert (n) {\n      if (n.parent === null) {\n        n.blacken()\n        return\n      } else if (n.parent.isBlack()) {\n        return\n      }\n      var uncle = n.getUncle()\n      if (uncle !== null && uncle.isRed()) {\n        // Note: parent: red, uncle: red\n        n.parent.blacken()\n        uncle.blacken()\n        n.grandparent.redden()\n        this._fixInsert(n.grandparent)\n      } else {\n        // Note: parent: red, uncle: black or null\n        // Now we transform the tree in such a way that\n        // either of these holds:\n        //   1) grandparent.left.isRed\n        //     and grandparent.left.left.isRed\n        //   2) grandparent.right.isRed\n        //     and grandparent.right.right.isRed\n        if (n === n.parent.right && n.parent === n.grandparent.left) {\n          n.parent.rotateLeft(this)\n          // Since we rotated and want to use the previous\n          // cases, we need to set n in such a way that\n          // n.parent.isRed again\n          n = n.left\n        } else if (n === n.parent.left && n.parent === n.grandparent.right) {\n          n.parent.rotateRight(this)\n          // see above\n          n = n.right\n        }\n        // Case 1) or 2) hold from here on.\n        // Now traverse grandparent, make parent a black node\n        // on the highest level which holds two red nodes.\n        n.parent.blacken()\n        n.grandparent.redden()\n        if (n === n.parent.left) {\n          // Case 1\n          n.grandparent.rotateRight(this)\n        } else {\n          // Case 2\n          n.grandparent.rotateLeft(this)\n        }\n      }\n    }\n  }\n\n  Y.utils.RBTree = RBTree\n}\n","'use strict'\n\n/*\n An operation also defines the structure of a type. This is why operation and\n structure are used interchangeably here.\n\n It must be of the type Object. I hope to achieve some performance\n improvements when working on databases that support the json format.\n\n An operation must have the following properties:\n\n * encode\n     - Encode the structure in a readable format (preferably string- todo)\n * decode (todo)\n     - decode structure to json\n * execute\n     - Execute the semantics of an operation.\n * requiredOps\n     - Operations that are required to execute this operation.\n*/\nmodule.exports = function (Y) {\n  var Struct = {\n    /* This is the only operation that is actually not a structure, because\n    it is not stored in the OS. This is why it _does not_ have an id\n\n    op = {\n      target: Id\n    }\n    */\n    Delete: {\n      encode: function (op) {\n        return op\n      },\n      requiredOps: function (op) {\n        return [] // [op.target]\n      },\n      execute: function * (op) {\n        return yield* this.deleteOperation(op.target)\n      }\n    },\n    Insert: {\n      /* {\n          content: any,\n          id: Id,\n          left: Id,\n          origin: Id,\n          right: Id,\n          parent: Id,\n          parentSub: string (optional), // child of Map type\n        }\n      */\n      encode: function (op) {\n        // TODO: you could not send the \"left\" property, then you also have to\n        // \"op.left = null\" in $execute or $decode\n        var e = {\n          id: op.id,\n          left: op.left,\n          right: op.right,\n          origin: op.origin,\n          parent: op.parent,\n          struct: op.struct\n        }\n        if (op.parentSub != null) {\n          e.parentSub = op.parentSub\n        }\n        if (op.opContent != null) {\n          e.opContent = op.opContent\n        } else {\n          e.content = op.content\n        }\n\n        return e\n      },\n      requiredOps: function (op) {\n        var ids = []\n        if (op.left != null) {\n          ids.push(op.left)\n        }\n        if (op.right != null) {\n          ids.push(op.right)\n        }\n        if (op.origin != null && !Y.utils.compareIds(op.left, op.origin)) {\n          ids.push(op.origin)\n        }\n        // if (op.right == null && op.left == null) {\n        ids.push(op.parent)\n\n        if (op.opContent != null) {\n          ids.push(op.opContent)\n        }\n        return ids\n      },\n      getDistanceToOrigin: function * (op) {\n        if (op.left == null) {\n          return 0\n        } else {\n          var d = 0\n          var o = yield* this.getOperation(op.left)\n          while (!Y.utils.compareIds(op.origin, (o ? o.id : null))) {\n            d++\n            if (o.left == null) {\n              break\n            } else {\n              o = yield* this.getOperation(o.left)\n            }\n          }\n          return d\n        }\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 i // loop counter\n        var distanceToOrigin = i = yield* Struct.Insert.getDistanceToOrigin.call(this, op) // most cases: 0 (starts from 0)\n        var o\n        var parent\n        var start\n\n        // find o. o is the first conflicting operation\n        if (op.left != null) {\n          o = yield* this.getOperation(op.left)\n          o = (o.right == null) ? null : yield* this.getOperation(o.right)\n        } else { // left == null\n          parent = yield* this.getOperation(op.parent)\n          let startId = op.parentSub ? parent.map[op.parentSub] : parent.start\n          start = startId == null ? null : yield* this.getOperation(startId)\n          o = start\n        }\n\n        // handle conflicts\n        while (true) {\n          if (o != null && !Y.utils.compareIds(o.id, op.right)) {\n            var oOriginDistance = yield* Struct.Insert.getDistanceToOrigin.call(this, o)\n            if (oOriginDistance === i) {\n              // case 1\n              if (o.id[0] < op.id[0]) {\n                op.left = o.id\n                distanceToOrigin = i + 1\n              }\n            } else if (oOriginDistance < i) {\n              // case 2\n              if (i - distanceToOrigin <= oOriginDistance) {\n                op.left = o.id\n                distanceToOrigin = i + 1\n              }\n            } else {\n              break\n            }\n            i++\n            o = o.right ? yield* this.getOperation(o.right) : null\n          } else {\n            break\n          }\n        }\n\n        // reconnect..\n        var left = null\n        var right = null\n        parent = parent || (yield* this.getOperation(op.parent))\n\n        // reconnect left and set right of op\n        if (op.left != null) {\n          left = yield* this.getOperation(op.left)\n          op.right = left.right\n          left.right = op.id\n\n          yield* this.setOperation(left)\n        } else {\n          op.right = op.parentSub ? parent.map[op.parentSub] || null : parent.start\n        }\n        // reconnect right\n        if (op.right != null) {\n          right = yield* this.getOperation(op.right)\n          right.left = op.id\n\n          // if right exists, and it is supposed to be gc'd. Remove it from the gc\n          if (right.gc != null) {\n            this.store.removeFromGarbageCollector(right)\n          }\n          yield* this.setOperation(right)\n        }\n\n        // update parents .map/start/end properties\n        if (op.parentSub != null) {\n          if (left == null) {\n            parent.map[op.parentSub] = op.id\n            yield* this.setOperation(parent)\n          }\n          // is a child of a map struct.\n          // Then also make sure that only the most left element is not deleted\n          if (op.right != null) {\n            yield* this.deleteOperation(op.right, true)\n          }\n          if (op.left != null) {\n            yield* this.deleteOperation(op.id, true)\n          }\n        } else {\n          if (right == null || left == null) {\n            if (right == null) {\n              parent.end = op.id\n            }\n            if (left == null) {\n              parent.start = op.id\n            }\n            yield* this.setOperation(parent)\n          }\n        }\n      }\n    },\n    List: {\n      /*\n      {\n        start: null,\n        end: null,\n        struct: \"List\",\n        type: \"\",\n        id: this.os.getNextOpId()\n      }\n      */\n      encode: function (op) {\n        return {\n          struct: 'List',\n          id: op.id,\n          type: op.type\n        }\n      },\n      requiredOps: function () {\n        /*\n        var 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        return []\n      },\n      execute: function * (op) {\n        op.start = null\n        op.end = null\n      },\n      ref: function * (op, pos) {\n        if (op.start == null) {\n          return null\n        }\n        var res = null\n        var o = yield* this.getOperation(op.start)\n\n        while (true) {\n          if (!o.deleted) {\n            res = o\n            pos--\n          }\n          if (pos >= 0 && o.right != null) {\n            o = (yield* this.getOperation(o.right))\n          } else {\n            break\n          }\n        }\n        return res\n      },\n      map: function * (o, f) {\n        o = o.start\n        var res = []\n        while (o != null) { // TODO: change to != (at least some convention)\n          var operation = yield* this.getOperation(o)\n          if (!operation.deleted) {\n            res.push(f(operation))\n          }\n          o = operation.right\n        }\n        return res\n      }\n    },\n    Map: {\n      /*\n        {\n          map: {},\n          struct: \"Map\",\n          type: \"\",\n          id: this.os.getNextOpId()\n        }\n      */\n      encode: function (op) {\n        return {\n          struct: 'Map',\n          type: op.type,\n          id: op.id,\n          map: {} // overwrite map!!\n        }\n      },\n      requiredOps: function () {\n        return []\n      },\n      execute: function * () {},\n      /*\n        Get a property by name\n      */\n      get: function * (op, name) {\n        var oid = op.map[name]\n        if (oid != null) {\n          var res = yield* this.getOperation(oid)\n          return (res == null || res.deleted) ? void 0 : (res.opContent == null\n            ? res.content : yield* this.getType(res.opContent))\n        }\n      },\n      /*\n        Delete a property by name\n      */\n      delete: function * (op, name) {\n        var v = op.map[name] || null\n        if (v != null) {\n          yield* Struct.Delete.create.call(this, {\n            target: v\n          })\n        }\n      }\n    }\n  }\n  Y.Struct = Struct\n}\n","'use strict'\n\n/*\n  Partial definition of a transaction\n\n  A transaction provides all the the async functionality on a database.\n\n  By convention, a transaction has the following properties:\n  * ss for StateSet\n  * os for OperationStore\n  * ds for DeleteStore\n\n  A transaction must also define the following methods:\n  * checkDeleteStoreForState(state)\n    - When increasing the state of a user, an operation with an higher id\n      may already be garbage collected, and therefore it will never be received.\n      update the state to reflect this knowledge. This won't call a method to save the state!\n  * getDeleteSet(id)\n    - Get the delete set in a readable format:\n      {\n        \"userX\": [\n          [5,1], // starting from position 5, one operations is deleted\n          [9,4]  // starting from position 9, four operations are deleted\n        ],\n        \"userY\": ...\n      }\n  * getOpsFromDeleteSet(ds) -- TODO: just call this.deleteOperation(id) here\n    - get a set of deletions that need to be applied in order to get to\n      achieve the state of the supplied ds\n  * setOperation(op)\n    - write `op` to the database.\n      Note: this is allowed to return an in-memory object.\n      E.g. the Memory adapter returns the object that it has in-memory.\n      Changing values on this object will be stored directly in the database\n      without calling this function. Therefore,\n      setOperation may have no functionality in some adapters. This also has\n      implications on the way we use operations that were served from the database.\n      We try not to call copyObject, if not necessary.\n  * addOperation(op)\n    - add an operation to the database.\n      This may only be called once for every op.id\n      Must return a function that returns the next operation in the database (ordered by id)\n  * getOperation(id)\n  * removeOperation(id)\n    - remove an operation from the database. This is called when an operation\n      is garbage collected.\n  * setState(state)\n    - `state` is of the form\n      {\n        user: \"1\",\n        clock: 4\n      } <- meaning that we have four operations from user \"1\"\n           (with these id's respectively: 0, 1, 2, and 3)\n  * getState(user)\n  * getStateVector()\n    - Get the state of the OS in the form\n    [{\n      user: \"userX\",\n      clock: 11\n    },\n     ..\n    ]\n  * getStateSet()\n    - Get the state of the OS in the form\n    {\n      \"userX\": 11,\n      \"userY\": 22\n    }\n   * getOperations(startSS)\n     - Get the all the operations that are necessary in order to achive the\n       stateSet of this user, starting from a stateSet supplied by another user\n   * makeOperationReady(ss, op)\n     - this is called only by `getOperations(startSS)`. It makes an operation\n       applyable on a given SS.\n*/\nmodule.exports = function (Y) {\n  class Transaction {\n    /*\n      Get a type based on the id of its model.\n      If it does not exist yes, create it.\n      TODO: delete type from store.initializedTypes[id] when corresponding id was deleted!\n    */\n    * getType (id) {\n      var sid = JSON.stringify(id)\n      var t = this.store.initializedTypes[sid]\n      if (t == null) {\n        var op = yield* this.getOperation(id)\n        if (op != null) {\n          t = yield* Y[op.type].initType.call(this, this.store, op)\n          this.store.initializedTypes[sid] = t\n        }\n      }\n      return t\n    }\n    /*\n      Apply operations that this user created (no remote ones!)\n        * does not check for Struct.*.requiredOps()\n        * also broadcasts it through the connector\n    */\n    * applyCreatedOperations (ops) {\n      var send = []\n      for (var i = 0; i < ops.length; i++) {\n        var op = ops[i]\n        yield* this.store.tryExecute.call(this, op)\n        send.push(Y.Struct[op.struct].encode(op))\n      }\n      if (!this.store.y.connector.isDisconnected()) {\n        this.store.y.connector.broadcast({\n          type: 'update',\n          ops: send\n        })\n      }\n    }\n\n    * deleteList (start) {\n      if (this.store.y.connector.isSynced) {\n        while (start != null && this.store.y.connector.isSynced) {\n          start = (yield* this.getOperation(start))\n          start.gc = true\n          yield* this.setOperation(start)\n          // TODO: will always reset the parent..\n          this.store.gc1.push(start.id)\n          start = start.right\n        }\n      } else {\n        // TODO: when not possible??? do later in (gcWhenSynced)\n      }\n    }\n\n    /*\n      Mark an operation as deleted, and add it to the GC, if possible.\n    */\n    * deleteOperation (targetId, preventCallType) {\n      var target = yield* this.getOperation(targetId)\n      var callType = false\n\n      if (target == null || !target.deleted) {\n        yield* this.markDeleted(targetId)\n      }\n\n      if (target != null && target.gc == null) {\n        if (!target.deleted) {\n          callType = true\n          // set deleted & notify type\n          target.deleted = true\n          /*\n          if (!preventCallType) {\n            var type = this.store.initializedTypes[JSON.stringify(target.parent)]\n            if (type != null) {\n              yield* type._changed(this, {\n                struct: 'Delete',\n                target: targetId\n              })\n            }\n          }\n          */\n          // delete containing lists\n          if (target.start != null) {\n            // TODO: don't do it like this .. -.-\n            yield* this.deleteList(target.start)\n            yield* this.deleteList(target.id)\n          }\n          if (target.map != null) {\n            for (var name in target.map) {\n              yield* this.deleteList(target.map[name])\n            }\n            // TODO: here to..  (see above)\n            yield* this.deleteList(target.id)\n          }\n          if (target.opContent != null) {\n            yield* this.deleteOperation(target.opContent)\n            target.opContent = null\n          }\n        }\n        var left = target.left != null ? yield* this.getOperation(target.left) : null\n\n        this.store.addToGarbageCollector(target, left)\n\n        // set here because it was deleted and/or gc'd\n        yield* this.setOperation(target)\n\n        /*\n          Check if it is possible to add right to the gc.\n          Because this delete can't be responsible for left being gc'd,\n          we don't have to add left to the gc..\n        */\n        var right = target.right != null ? yield* this.getOperation(target.right) : null\n        if (\n          right != null &&\n          this.store.addToGarbageCollector(right, target)\n        ) {\n          yield* this.setOperation(right)\n        }\n        return callType\n      }\n    }\n    /*\n      Mark an operation as deleted&gc'd\n    */\n    * markGarbageCollected (id) {\n      // this.mem.push([\"gc\", id]);\n      var n = yield* this.markDeleted(id)\n      if (!n.gc) {\n        if (n.id[1] < id[1]) {\n          // un-extend left\n          var newlen = n.len - (id[1] - n.id[1])\n          n.len -= newlen\n          yield* this.ds.put(n)\n          n = {id: id, len: newlen, gc: false}\n          yield* this.ds.put(n)\n        }\n        // get prev&next before adding a new operation\n        var prev = yield* this.ds.findPrev(id)\n        var next = yield* this.ds.findNext(id)\n\n        if (id[1] < n.id[1] + n.len - 1) {\n          // un-extend right\n          yield* this.ds.put({id: [id[0], id[1] + 1], len: n.len - 1, gc: false})\n          n.len = 1\n        }\n        // set gc'd\n        n.gc = true\n        // can extend left?\n        if (\n          prev != null &&\n          prev.gc &&\n          Y.utils.compareIds([prev.id[0], prev.id[1] + prev.len], n.id)\n        ) {\n          prev.len += n.len\n          yield* this.ds.delete(n.id)\n          n = prev\n          // ds.put n here?\n        }\n        // can extend right?\n        if (\n          next != null &&\n          next.gc &&\n          Y.utils.compareIds([n.id[0], n.id[1] + n.len], next.id)\n        ) {\n          n.len += next.len\n          yield* this.ds.delete(next.id)\n        }\n        yield* this.ds.put(n)\n      }\n    }\n    /*\n      Mark an operation as deleted.\n\n      returns the delete node\n    */\n    * markDeleted (id) {\n      // this.mem.push([\"del\", id]);\n      var n = yield* this.ds.findWithUpperBound(id)\n      if (n != null && n.id[0] === id[0]) {\n        if (n.id[1] <= id[1] && id[1] < n.id[1] + n.len) {\n          // already deleted\n          return n\n        } else if (n.id[1] + n.len === id[1] && !n.gc) {\n          // can extend existing deletion\n          n.len++\n        } else {\n          // cannot extend left\n          n = {id: id, len: 1, gc: false}\n          yield* this.ds.put(n)\n        }\n      } else {\n        // cannot extend left\n        n = {id: id, len: 1, gc: false}\n        yield* this.ds.put(n)\n      }\n      // can extend right?\n      var next = yield* this.ds.findNext(n.id)\n      if (\n        next != null &&\n        Y.utils.compareIds([n.id[0], n.id[1] + n.len], next.id) &&\n        !next.gc\n      ) {\n        n.len = n.len + next.len\n        yield* this.ds.delete(next.id)\n      }\n      yield* this.ds.put(n)\n      return n\n    }\n    /*\n      Call this method when the client is connected&synced with the\n      other clients (e.g. master). This will query the database for\n      operations that can be gc'd and add them to the garbage collector.\n    */\n    * garbageCollectAfterSync () {\n      yield* this.os.iterate(this, null, null, function * (op) {\n        if (op.deleted && op.left != null) {\n          var left = yield* this.getOperation(op.left)\n          this.store.addToGarbageCollector(op, left)\n        }\n      })\n    }\n    /*\n      Really remove an op and all its effects.\n      The complicated case here is the Insert operation:\n      * reset left\n      * reset right\n      * reset parent.start\n      * reset parent.end\n      * reset origins of all right ops\n    */\n    * garbageCollectOperation (id) {\n      this.store.addToDebug('yield* this.garbageCollectOperation(', id, ')')\n      // check to increase the state of the respective user\n      var state = yield* this.getState(id[0])\n      if (state.clock === id[1]) {\n        state.clock++\n        // also check if more expected operations were gc'd\n        yield* this.checkDeleteStoreForState(state)\n        // then set the state\n        yield* this.setState(state)\n      }\n      yield* this.markGarbageCollected(id)\n\n      // if op exists, then clean that mess up..\n      var o = yield* this.getOperation(id)\n      if (o != null) {\n        /*\n        if (!o.deleted) {\n          yield* this.deleteOperation(id)\n          o = yield* this.getOperation(id)\n        }\n        */\n\n        // remove gc'd op from the left op, if it exists\n        if (o.left != null) {\n          var left = yield* this.getOperation(o.left)\n          left.right = o.right\n          yield* this.setOperation(left)\n        }\n        // remove gc'd op from the right op, if it exists\n        // also reset origins of right ops\n        if (o.right != null) {\n          var right = yield* this.getOperation(o.right)\n          right.left = o.left\n          if (Y.utils.compareIds(right.origin, o.id)) { // rights origin is o\n            // find new origin of right ops\n            // origin is the first left deleted operation\n            var neworigin = o.left\n            while (neworigin != null) {\n              var neworigin_ = yield* this.getOperation(neworigin)\n              if (neworigin_.deleted) {\n                break\n              }\n              neworigin = neworigin_.left\n            }\n\n            // reset origin of right\n            right.origin = neworigin\n\n            // reset origin of all right ops (except first right - duh!),\n            // until you find origin pointer to the left of o\n            var i = right.right == null ? null : yield* this.getOperation(right.right)\n            var ids = [o.id, o.right]\n            while (i != null && ids.some(function (id) {\n              return Y.utils.compareIds(id, i.origin)\n            })) {\n              if (Y.utils.compareIds(i.origin, o.id)) {\n                // reset origin of i\n                i.origin = neworigin\n                yield* this.setOperation(i)\n              }\n              // get next i\n              i = i.right == null ? null : yield* this.getOperation(i.right)\n            }\n          } /* otherwise, rights origin is to the left of o,\n               then there is no right op (from o), that origins in o */\n          yield* this.setOperation(right)\n        }\n\n        if (o.parent != null) {\n          // remove gc'd op from parent, if it exists\n          var parent = yield* this.getOperation(o.parent)\n          var setParent = false // whether to save parent to the os\n          if (o.parentSub != null) {\n            if (Y.utils.compareIds(parent.map[o.parentSub], o.id)) {\n              setParent = true\n              parent.map[o.parentSub] = o.right\n            }\n          } else {\n            if (Y.utils.compareIds(parent.start, o.id)) {\n              // gc'd op is the start\n              setParent = true\n              parent.start = o.right\n            }\n            if (Y.utils.compareIds(parent.end, o.id)) {\n              // gc'd op is the end\n              setParent = true\n              parent.end = o.left\n            }\n          }\n          if (setParent) {\n            yield* this.setOperation(parent)\n          }\n        }\n        // finally remove it from the os\n        yield* this.removeOperation(o.id)\n      }\n    }\n    * checkDeleteStoreForState (state) {\n      var n = yield* this.ds.findWithUpperBound([state.user, state.clock])\n      if (n != null && n.id[0] === state.user && n.gc) {\n        state.clock = Math.max(state.clock, n.id[1] + n.len)\n      }\n    }\n    /*\n      apply a delete set in order to get\n      the state of the supplied ds\n    */\n    * applyDeleteSet (ds) {\n      var deletions = []\n      function createDeletions (user, start, len, gc) {\n        for (var c = start; c < start + len; c++) {\n          deletions.push([user, c, gc])\n        }\n      }\n\n      for (var user in ds) {\n        var dv = ds[user]\n        var pos = 0\n        var d = dv[pos]\n        yield* this.ds.iterate(this, [user, 0], [user, Number.MAX_VALUE], function * (n) {\n          // cases:\n          // 1. d deletes something to the right of n\n          //  => go to next n (break)\n          // 2. d deletes something to the left of n\n          //  => create deletions\n          //  => reset d accordingly\n          //  *)=> if d doesn't delete anything anymore, go to next d (continue)\n          // 3. not 2) and d deletes something that also n deletes\n          //  => reset d so that it doesn't contain n's deletion\n          //  *)=> if d does not delete anything anymore, go to next d (continue)\n          while (d != null) {\n            var diff = 0 // describe the diff of length in 1) and 2)\n            if (n.id[1] + n.len <= d[0]) {\n              // 1)\n              break\n            } else if (d[0] < n.id[1]) {\n              // 2)\n              // delete maximum the len of d\n              // else delete as much as possible\n              diff = Math.min(n.id[1] - d[0], d[1])\n              createDeletions(user, d[0], diff, d[2])\n            } else {\n              // 3)\n              diff = n.id[1] + n.len - d[0] // never null (see 1)\n              if (d[2] && !n.gc) {\n                // d marks as gc'd but n does not\n                // then delete either way\n                createDeletions(user, d[0], Math.min(diff, d[1]), d[2])\n              }\n            }\n            if (d[1] <= diff) {\n              // d doesn't delete anything anymore\n              d = dv[++pos]\n            } else {\n              d[0] = d[0] + diff // reset pos\n              d[1] = d[1] - diff // reset length\n            }\n          }\n        })\n        // for the rest.. just apply it\n        for (; pos < dv.length; pos++) {\n          d = dv[pos]\n          createDeletions(user, d[0], d[1], d[2])\n        }\n      }\n      for (var i in deletions) {\n        var del = deletions[i]\n        var id = [del[0], del[1]]\n        // always try to delete..\n        var addOperation = yield* this.deleteOperation(id)\n        if (addOperation) {\n          // TODO:.. really .. here? You could prevent calling all these functions in operationAdded\n          yield* this.store.operationAdded(this, {struct: 'Delete', target: id})\n        }\n        if (del[2]) {\n          // gc\n          yield* this.garbageCollectOperation(id)\n        }\n      }\n    }\n    * isGarbageCollected (id) {\n      var n = yield* this.ds.findWithUpperBound(id)\n      return n != null && n.id[0] === id[0] && id[1] < n.id[1] + n.len && n.gc\n    }\n    /*\n      A DeleteSet (ds) describes all the deleted ops in the OS\n    */\n    * getDeleteSet () {\n      var ds = {}\n      yield* this.ds.iterate(this, null, null, function * (n) {\n        var user = n.id[0]\n        var counter = n.id[1]\n        var len = n.len\n        var gc = n.gc\n        var dv = ds[user]\n        if (dv === void 0) {\n          dv = []\n          ds[user] = dv\n        }\n        dv.push([counter, len, gc])\n      })\n      return ds\n    }\n    * isDeleted (id) {\n      var n = yield* this.ds.findWithUpperBound(id)\n      return n != null && n.id[0] === id[0] && id[1] < n.id[1] + n.len\n    }\n    * setOperation (op) {\n      yield* this.os.put(op)\n      return op\n    }\n    * addOperation (op) {\n      yield* this.os.put(op)\n    }\n    * getOperation (id) {\n      return yield* this.os.find(id)\n    }\n    * removeOperation (id) {\n      yield* this.os.delete(id)\n    }\n    * setState (state) {\n      var val = {\n        id: [state.user],\n        clock: state.clock\n      }\n      // TODO: find a way to skip this step.. (after implementing some dbs..)\n      if (yield* this.ss.find([state.user])) {\n        yield* this.ss.put(val)\n      } else {\n        yield* this.ss.put(val)\n      }\n    }\n    * getState (user) {\n      var n\n      var clock = (n = yield* this.ss.find([user])) == null ? null : n.clock\n      if (clock == null) {\n        clock = 0\n      }\n      return {\n        user: user,\n        clock: clock\n      }\n    }\n    * getStateVector () {\n      var stateVector = []\n      yield* this.ss.iterate(this, null, null, function * (n) {\n        stateVector.push({\n          user: n.id[0],\n          clock: n.clock\n        })\n      })\n      return stateVector\n    }\n    * getStateSet () {\n      var ss = {}\n      yield* this.ss.iterate(this, null, null, function * (n) {\n        ss[n.id[0]] = n.clock\n      })\n      return ss\n    }\n    * getOperations (startSS) {\n      // TODO: use bounds here!\n      if (startSS == null) {\n        startSS = {}\n      }\n      var ops = []\n\n      var endSV = yield* this.getStateVector()\n      for (var endState of endSV) {\n        var user = endState.user\n        if (user === '_') {\n          continue\n        }\n        var startPos = startSS[user] || 0\n\n        yield* this.os.iterate(this, [user, startPos], [user, Number.MAX_VALUE], function * (op) {\n          ops.push(op)\n        })\n      }\n      var res = []\n      for (var op of ops) {\n        res.push(yield* this.makeOperationReady(startSS, op))\n      }\n      return res\n    }\n    /*\n      Here, we make op executable for the receiving user.\n\n      Notes:\n        startSS: denotes to the SV that the remote user sent\n        currSS:  denotes to the state vector that the user should have if he\n                 applies all already sent operations (increases is each step)\n\n      We face several problems:\n      * Execute op as is won't work because ops depend on each other\n       -> find a way so that they do not anymore\n      * When changing left, must not go more to the left than the origin\n      * When changing right, you have to consider that other ops may have op\n        as their origin, this means that you must not set one of these ops\n        as the new right (interdependencies of ops)\n      * can't just go to the right until you find the first known operation,\n        With currSS\n          -> interdependency of ops is a problem\n        With startSS\n          -> leads to inconsistencies when two users join at the same time.\n             Then the position depends on the order of execution -> error!\n\n        Solution:\n        -> re-create originial situation\n          -> set op.left = op.origin (which never changes)\n          -> set op.right\n               to the first operation that is known (according to startSS)\n               or to the first operation that has an origin that is not to the\n               right of op.\n          -> Enforces unique execution order -> happy user\n\n        Improvements: TODO\n          * Could set left to origin, or the first known operation\n            (startSS or currSS.. ?)\n            -> Could be necessary when I turn GC again.\n            -> Is a bad(ish) idea because it requires more computation\n    */\n    * makeOperationReady (startSS, op) {\n      op = Y.Struct[op.struct].encode(op)\n      op = Y.utils.copyObject(op)\n      var o = op\n      var ids = [op.id]\n      // search for the new op.right\n      // it is either the first known op (according to startSS)\n      // or the o that has no origin to the right of op\n      // (this is why we use the ids array)\n      while (o.right != null) {\n        var right = yield* this.getOperation(o.right)\n        if (o.right[1] < (startSS[o.right[0]] || 0) || !ids.some(function (id) {\n          return Y.utils.compareIds(id, right.origin)\n        })) {\n          break\n        }\n        ids.push(o.right)\n        o = right\n      }\n      op.right = o.right\n      op.left = op.origin\n      return op\n    }\n  }\n  Y.Transaction = Transaction\n}\n","'use strict'\n\nfunction extend (Y) {\n  class YArray {\n    constructor (os, _model, idArray, valArray) {\n      this.os = os\n      this._model = _model\n      // Array of all the operation id's\n      this.idArray = idArray\n      // Array of all the values\n      this.valArray = valArray\n      this.eventHandler = new Y.utils.EventHandler(ops => {\n        var userEvents = []\n        for (var i in ops) {\n          var op = ops[i]\n          if (op.struct === 'Insert') {\n            let pos\n            // we check op.left only!,\n            // because op.right might not be defined when this is called\n            if (op.left === null) {\n              pos = 0\n            } else {\n              var sid = JSON.stringify(op.left)\n              pos = this.idArray.indexOf(sid) + 1\n              if (pos <= 0) {\n                throw new Error('Unexpected operation!')\n              }\n            }\n            this.idArray.splice(pos, 0, JSON.stringify(op.id))\n            this.valArray.splice(pos, 0, op.content)\n            userEvents.push({\n              type: 'insert',\n              object: this,\n              index: pos,\n              length: 1\n            })\n          } else if (op.struct === 'Delete') {\n            let pos = this.idArray.indexOf(JSON.stringify(op.target))\n            if (pos >= 0) {\n              this.idArray.splice(pos, 1)\n              this.valArray.splice(pos, 1)\n              userEvents.push({\n                type: 'delete',\n                object: this,\n                index: pos,\n                length: 1\n              })\n            }\n          } else {\n            throw new Error('Unexpected struct!')\n          }\n        }\n        this.eventHandler.callEventListeners(userEvents)\n      })\n    }\n    get length () {\n      return this.idArray.length\n    }\n    get (pos) {\n      if (pos == null || typeof pos !== 'number') {\n        throw new Error('pos must be a number!')\n      }\n      return this.valArray[pos]\n    }\n    toArray () {\n      return this.valArray.slice()\n    }\n    insert (pos, contents) {\n      if (typeof pos !== 'number') {\n        throw new Error('pos must be a number!')\n      }\n      if (!(contents instanceof Array)) {\n        throw new Error('contents must be an Array of objects!')\n      }\n      if (contents.length === 0) {\n        return\n      }\n      if (pos > this.idArray.length || pos < 0) {\n        throw new Error('This position exceeds the range of the array!')\n      }\n      var mostLeft = pos === 0 ? null : JSON.parse(this.idArray[pos - 1])\n\n      var ops = []\n      var prevId = mostLeft\n      for (var i = 0; i < contents.length; i++) {\n        var op = {\n          left: prevId,\n          origin: prevId,\n          // right: mostRight,\n          // NOTE: I intentionally do not define right here, because it could be deleted\n          // at the time of creating this operation, and is therefore not defined in idArray\n          parent: this._model,\n          content: contents[i],\n          struct: 'Insert',\n          id: this.os.getNextOpId()\n        }\n        ops.push(op)\n        prevId = op.id\n      }\n      var eventHandler = this.eventHandler\n      eventHandler.awaitAndPrematurelyCall(ops)\n      this.os.requestTransaction(function *() {\n        // now we can set the right reference.\n        var mostRight\n        if (mostLeft != null) {\n          mostRight = (yield* this.getOperation(mostLeft)).right\n        } else {\n          mostRight = (yield* this.getOperation(ops[0].parent)).start\n        }\n        for (var j in ops) {\n          ops[j].right = mostRight\n        }\n        yield* this.applyCreatedOperations(ops)\n        eventHandler.awaitedInserts(ops.length)\n      })\n    }\n    delete (pos, length) {\n      if (length == null) { length = 1 }\n      if (typeof length !== 'number') {\n        throw new Error('pos must be a number!')\n      }\n      if (typeof pos !== 'number') {\n        throw new Error('pos must be a number!')\n      }\n      if (pos + length > this.idArray.length || pos < 0 || length < 0) {\n        throw new Error('The deletion range exceeds the range of the array!')\n      }\n      if (length === 0) {\n        return\n      }\n      var eventHandler = this.eventHandler\n      var newLeft = pos > 0 ? JSON.parse(this.idArray[pos - 1]) : null\n      var dels = []\n      for (var i = 0; i < length; i++) {\n        dels.push({\n          target: JSON.parse(this.idArray[pos + i]),\n          struct: 'Delete'\n        })\n      }\n      eventHandler.awaitAndPrematurelyCall(dels)\n      this.os.requestTransaction(function *() {\n        yield* this.applyCreatedOperations(dels)\n        eventHandler.awaitedDeletes(dels.length, newLeft)\n      })\n    }\n    observe (f) {\n      this.eventHandler.addEventListener(f)\n    }\n    * _changed (transaction, op) {\n      if (!op.deleted) {\n        if (op.struct === 'Insert') {\n          var l = op.left\n          var left\n          while (l != null) {\n            left = yield* transaction.getOperation(l)\n            if (!left.deleted) {\n              break\n            }\n            l = left.left\n          }\n          op.left = l\n        }\n        this.eventHandler.receivedOp(op)\n      }\n    }\n  }\n\n  Y.extend('Array', new Y.utils.CustomType({\n    class: YArray,\n    createType: function * YArrayCreator () {\n      var modelid = this.store.getNextOpId()\n      var model = {\n        struct: 'List',\n        type: 'Array',\n        start: null,\n        end: null,\n        id: modelid\n      }\n      yield* this.applyCreatedOperations([model])\n      return modelid\n    },\n    initType: function * YArrayInitializer (os, model) {\n      var valArray = []\n      var idArray = yield* Y.Struct.List.map.call(this, model, function (c) {\n        valArray.push(c.content)\n        return JSON.stringify(c.id)\n      })\n      return new YArray(os, model.id, idArray, valArray)\n    }\n  }))\n}\n\nif (typeof Y !== 'undefined') {\n  extend(Y)\n} else {\n  module.exports = extend\n}\n","'use strict'\n\nmodule.exports = function (Y) {\n  class YMap {\n    constructor (os, model, contents, opContents) {\n      this._model = model.id\n      this.os = os\n      this.map = Y.utils.copyObject(model.map)\n      this.contents = contents\n      this.opContents = opContents\n      this.eventHandler = new Y.utils.EventHandler(ops => {\n        var userEvents = []\n        for (var i in ops) {\n          var op = ops[i]\n          var oldValue\n          // key is the name to use to access (op)content\n          var key = op.struct === 'Delete' ? op.key : op.parentSub\n\n          // compute oldValue\n          if (this.opContents[key] != null) {\n            let prevType = this.opContents[key]\n            oldValue = () => {// eslint-disable-line\n              return new Promise((resolve) => {\n                this.os.requestTransaction(function *() {// eslint-disable-line\n                  resolve(yield* this.getType(prevType))\n                })\n              })\n            }\n          } else {\n            oldValue = this.contents[key]\n          }\n          // compute op event\n          if (op.struct === 'Insert') {\n            if (op.left === null) {\n              if (op.opContent != null) {\n                delete this.contents[key]\n                if (op.deleted) {\n                  delete this.opContents[key]\n                } else {\n                  this.opContents[key] = op.opContent\n                }\n              } else {\n                delete this.opContents[key]\n                if (op.deleted) {\n                  delete this.contents[key]\n                } else {\n                  this.contents[key] = op.content\n                }\n              }\n              this.map[key] = op.id\n              var insertEvent = {\n                name: key,\n                object: this\n              }\n              if (oldValue === undefined) {\n                insertEvent.type = 'add'\n              } else {\n                insertEvent.type = 'update'\n                insertEvent.oldValue = oldValue\n              }\n              userEvents.push(insertEvent)\n            }\n          } else if (op.struct === 'Delete') {\n            if (Y.utils.compareIds(this.map[key], op.target)) {\n              delete this.opContents[key]\n              delete this.contents[key]\n              var deleteEvent = {\n                name: key,\n                object: this,\n                oldValue: oldValue,\n                type: 'delete'\n              }\n              userEvents.push(deleteEvent)\n            }\n          } else {\n            throw new Error('Unexpected Operation!')\n          }\n        }\n        this.eventHandler.callEventListeners(userEvents)\n      })\n    }\n    get (key) {\n      // return property.\n      // if property does not exist, return null\n      // if property is a type, return a promise\n      if (key == null) {\n        throw new Error('You must specify key!')\n      }\n      if (this.opContents[key] == null) {\n        return this.contents[key]\n      } else {\n        return new Promise((resolve) => {\n          var oid = this.opContents[key]\n          this.os.requestTransaction(function *() {\n            resolve(yield* this.getType(oid))\n          })\n        })\n      }\n    }\n    /*\n      If there is a primitive (not a custom type), then return it.\n      Returns all primitive values, if propertyName is specified!\n      Note: modifying the return value could result in inconsistencies!\n        -- so make sure to copy it first!\n    */\n    getPrimitive (key) {\n      if (key == null) {\n        return Y.utils.copyObject(this.contents)\n      } else {\n        return this.contents[key]\n      }\n    }\n    delete (key) {\n      var right = this.map[key]\n      if (right != null) {\n        var del = {\n          target: right,\n          struct: 'Delete'\n        }\n        var eventHandler = this.eventHandler\n        var modDel = Y.utils.copyObject(del)\n        modDel.key = key\n        eventHandler.awaitAndPrematurelyCall([modDel])\n        this.os.requestTransaction(function *() {\n          yield* this.applyCreatedOperations([del])\n          eventHandler.awaitedDeletes(1)\n        })\n      }\n    }\n    set (key, value) {\n      // set property.\n      // if property is a type, return a promise\n      // if not, apply immediately on this type an call event\n\n      var right = this.map[key] || null\n      var insert = {\n        left: null,\n        right: right,\n        origin: null,\n        parent: this._model,\n        parentSub: key,\n        struct: 'Insert'\n      }\n      return new Promise((resolve) => {\n        if (value instanceof Y.utils.CustomType) {\n          // construct a new type\n          this.os.requestTransaction(function *() {\n            var typeid = yield* value.createType.call(this)\n            var type = yield* this.getType(typeid)\n            insert.opContent = typeid\n            insert.id = this.store.getNextOpId()\n            yield* this.applyCreatedOperations([insert])\n            resolve(type)\n          })\n        } else {\n          insert.content = value\n          insert.id = this.os.getNextOpId()\n          var eventHandler = this.eventHandler\n          eventHandler.awaitAndPrematurelyCall([insert])\n\n          this.os.requestTransaction(function *() {\n            yield* this.applyCreatedOperations([insert])\n            eventHandler.awaitedInserts(1)\n          })\n          resolve(value)\n        }\n      })\n    }\n    observe (f) {\n      this.eventHandler.addEventListener(f)\n    }\n    unobserve (f) {\n      this.eventHandler.removeEventListener(f)\n    }\n    /*\n      Observe a path.\n\n      E.g.\n      ```\n      o.set('textarea', Y.TextBind)\n      o.observePath(['textarea'], function(t){\n        // is called whenever textarea is replaced\n        t.bind(textarea)\n      })\n\n      returns a Promise that contains a function that removes the observer from the path.\n    */\n    observePath (path, f) {\n      var self = this\n      function observeProperty (events) {\n        // call f whenever path changes\n        for (var i = 0; i < events.length; i++) {\n          var event = events[i]\n          if (event.name === propertyName) {\n            // call this also for delete events!\n            var property = self.get(propertyName)\n            if (property instanceof Promise) {\n              property.then(f)\n            } else {\n              f(property)\n            }\n          }\n        }\n      }\n\n      if (path.length < 1) {\n        throw new Error('Path must contain at least one element!')\n      } else if (path.length === 1) {\n        var propertyName = path[0]\n        var property = self.get(propertyName)\n        if (property instanceof Promise) {\n          property.then(f)\n        } else {\n          f(property)\n        }\n        this.observe(observeProperty)\n        return Promise.resolve(function () {\n          self.unobserve(f)\n        })\n      } else {\n        var deleteChildObservers\n        var resetObserverPath = function () {\n          var promise = self.get(path[0])\n          if (!promise instanceof Promise) {\n            // its either not defined or a primitive value\n            promise = self.set(path[0], Y.Map)\n          }\n          return promise.then(function (map) {\n            return map.observePath(path.slice(1), f)\n          }).then(function (_deleteChildObservers) {\n            // update deleteChildObservers\n            deleteChildObservers = _deleteChildObservers\n            return Promise.resolve() // Promise does not return anything\n          })\n        }\n        var observer = function (events) {\n          for (var e in events) {\n            var event = events[e]\n            if (event.name === path[0]) {\n              deleteChildObservers()\n              if (event.type === 'add' || event.type === 'update') {\n                resetObserverPath()\n              }\n              // TODO: what about the delete events?\n            }\n          }\n        }\n        self.observe(observer)\n        return resetObserverPath().then(\n          // this promise contains a function that deletes all the child observers\n          // and how to unobserve the observe from this object\n          Promise.resolve(function () {\n            deleteChildObservers()\n            self.unobserve(observer)\n          })\n        )\n      }\n    }\n    * _changed (transaction, op) {\n      if (op.struct === 'Delete') {\n        op.key = (yield* transaction.getOperation(op.target)).parentSub\n      }\n      this.eventHandler.receivedOp(op)\n    }\n  }\n  Y.Map = new Y.utils.CustomType({\n    class: YMap,\n    createType: function * YMapCreator () {\n      var modelid = this.store.getNextOpId()\n      var model = {\n        map: {},\n        struct: 'Map',\n        type: 'Map',\n        id: modelid\n      }\n      yield* this.applyCreatedOperations([model])\n      return modelid\n    },\n    initType: function * YMapInitializer (os, model) {\n      var contents = {}\n      var opContents = {}\n      var map = model.map\n      for (var name in map) {\n        var op = yield* this.getOperation(map[name])\n        if (op.opContent != null) {\n          opContents[name] = op.opContent\n        } else {\n          contents[name] = op.content\n        }\n      }\n      return new YMap(os, model, contents, opContents)\n    }\n  })\n}\n","'use strict'\n\nmodule.exports = function (Y) {\n  class YTextBind extends Y.Array['class'] {\n    constructor (os, _model, idArray, valArray) {\n      super(os, _model, idArray, valArray)\n      this.textfields = []\n    }\n    toString () {\n      return this.valArray.join('')\n    }\n    insert (pos, content) {\n      super.insert(pos, content.split(''))\n    }\n    bind (textfield, domRoot) {\n      domRoot = domRoot || window; // eslint-disable-line\n      if (domRoot.getSelection == null) {\n        domRoot = window;// eslint-disable-line\n      }\n\n      // don't duplicate!\n      for (var t in this.textfields) {\n        if (this.textfields[t] === textfield) {\n          return\n        }\n      }\n      var creatorToken = false\n\n      var word = this\n      textfield.value = this.toString()\n      this.textfields.push(textfield)\n      var createRange, writeRange, writeContent\n      if (textfield.selectionStart != null && textfield.setSelectionRange != null) {\n        createRange = function (fix) {\n          var left = textfield.selectionStart\n          var right = textfield.selectionEnd\n          if (fix != null) {\n            left = fix(left)\n            right = fix(right)\n          }\n          return {\n            left: left,\n            right: right\n          }\n        }\n        writeRange = function (range) {\n          writeContent(word.toString())\n          textfield.setSelectionRange(range.left, range.right)\n        }\n        writeContent = function (content) {\n          textfield.value = content\n        }\n      } else {\n        createRange = function (fix) {\n          var range = {}\n          var s = domRoot.getSelection()\n          var clength = textfield.textContent.length\n          range.left = Math.min(s.anchorOffset, clength)\n          range.right = Math.min(s.focusOffset, clength)\n          if (fix != null) {\n            range.left = fix(range.left)\n            range.right = fix(range.right)\n          }\n          var editedElement = s.focusNode\n          if (editedElement === textfield || editedElement === textfield.childNodes[0]) {\n            range.isReal = true\n          } else {\n            range.isReal = false\n          }\n          return range\n        }\n\n        writeRange = function (range) {\n          writeContent(word.toString())\n          var textnode = textfield.childNodes[0]\n          if (range.isReal && textnode != null) {\n            if (range.left < 0) {\n              range.left = 0\n            }\n            range.right = Math.max(range.left, range.right)\n            if (range.right > textnode.length) {\n              range.right = textnode.length\n            }\n            range.left = Math.min(range.left, range.right)\n            var r = document.createRange(); // eslint-disable-line\n            r.setStart(textnode, range.left)\n            r.setEnd(textnode, range.right)\n            var s = window.getSelection(); // eslint-disable-line\n            s.removeAllRanges()\n            s.addRange(r)\n          }\n        }\n        writeContent = function (content) {\n          var contentArray = content.replace(new RegExp('\\n', 'g'), ' ').split(' ');// eslint-disable-line\n          textfield.innerText = ''\n          for (var i in contentArray) {\n            var c = contentArray[i]\n            textfield.innerText += c\n            if (i !== contentArray.length - 1) {\n              textfield.innerHTML += '&nbsp;'\n            }\n          }\n        }\n      }\n      writeContent(this.toString())\n\n      this.observe(function (events) {\n        for (var e in events) {\n          var event = events[e]\n          if (!creatorToken) {\n            var oPos, fix\n            if (event.type === 'insert') {\n              oPos = event.index\n              fix = function (cursor) {// eslint-disable-line\n                if (cursor <= oPos) {\n                  return cursor\n                } else {\n                  cursor += 1\n                  return cursor\n                }\n              }\n              var r = createRange(fix)\n              writeRange(r)\n            } else if (event.type === 'delete') {\n              oPos = event.index\n              fix = function (cursor) {// eslint-disable-line\n                if (cursor < oPos) {\n                  return cursor\n                } else {\n                  cursor -= 1\n                  return cursor\n                }\n              }\n              r = createRange(fix)\n              writeRange(r)\n            }\n          }\n        }\n      })\n      // consume all text-insert changes.\n      textfield.onkeypress = function (event) {\n        if (word.is_deleted) {\n          // if word is deleted, do not do anything ever again\n          textfield.onkeypress = null\n          return true\n        }\n        creatorToken = true\n        var char\n        if (event.keyCode === 13) {\n          char = '\\n'\n        } else if (event.key != null) {\n          if (event.charCode === 32) {\n            char = ' '\n          } else {\n            char = event.key\n          }\n        } else {\n          char = window.String.fromCharCode(event.keyCode); // eslint-disable-line\n        }\n        if (char.length > 1) {\n          return true\n        } else if (char.length > 0) {\n          var r = createRange()\n          var pos = Math.min(r.left, r.right, word.length)\n          var diff = Math.abs(r.right - r.left)\n          word.delete(pos, diff)\n          word.insert(pos, char)\n          r.left = pos + char.length\n          r.right = r.left\n          writeRange(r)\n        }\n        event.preventDefault()\n        creatorToken = false\n        return false\n      }\n      textfield.onpaste = function (event) {\n        if (word.is_deleted) {\n          // if word is deleted, do not do anything ever again\n          textfield.onpaste = null\n          return true\n        }\n        event.preventDefault()\n      }\n      textfield.oncut = function (event) {\n        if (word.is_deleted) {\n          // if word is deleted, do not do anything ever again\n          textfield.oncut = null\n          return true\n        }\n        event.preventDefault()\n      }\n      //\n      // consume deletes. Note that\n      //   chrome: won't consume deletions on keypress event.\n      //   keyCode is deprecated. BUT: I don't see another way.\n      //     since event.key is not implemented in the current version of chrome.\n      //     Every browser supports keyCode. Let's stick with it for now..\n      //\n      textfield.onkeydown = function (event) {\n        creatorToken = true\n        if (word.is_deleted) {\n          // if word is deleted, do not do anything ever again\n          textfield.onkeydown = null\n          return true\n        }\n        var r = createRange()\n        var pos = Math.min(r.left, r.right, word.toString().length)\n        var diff = Math.abs(r.left - r.right)\n        if (event.keyCode != null && event.keyCode === 8) { // Backspace\n          if (diff > 0) {\n            word.delete(pos, diff)\n            r.left = pos\n            r.right = pos\n            writeRange(r)\n          } else {\n            if (event.ctrlKey != null && event.ctrlKey) {\n              var val = word.toString()\n              var newPos = pos\n              var delLength = 0\n              if (pos > 0) {\n                newPos--\n                delLength++\n              }\n              while (newPos > 0 && val[newPos] !== ' ' && val[newPos] !== '\\n') {\n                newPos--\n                delLength++\n              }\n              word.delete(newPos, pos - newPos)\n              r.left = newPos\n              r.right = newPos\n              writeRange(r)\n            } else {\n              if (pos > 0) {\n                word.delete(pos - 1, 1)\n                r.left = pos - 1\n                r.right = pos - 1\n                writeRange(r)\n              }\n            }\n          }\n          event.preventDefault()\n          creatorToken = false\n          return false\n        } else if (event.keyCode != null && event.keyCode === 46) { // Delete\n          if (diff > 0) {\n            word.delete(pos, diff)\n            r.left = pos\n            r.right = pos\n            writeRange(r)\n          } else {\n            word.delete(pos, 1)\n            r.left = pos\n            r.right = pos\n            writeRange(r)\n          }\n          event.preventDefault()\n          creatorToken = false\n          return false\n        } else {\n          creatorToken = false\n          return true\n        }\n      }\n    }\n  }\n  Y.TextBind = new Y.utils.CustomType({\n    class: YTextBind,\n    createType: function * YTextBindCreator () {\n      var modelid = this.store.getNextOpId()\n      var model = {\n        start: null,\n        end: null,\n        struct: 'List',\n        type: 'TextBind',\n        id: modelid\n      }\n      yield* this.applyCreatedOperations([model])\n      return modelid\n    },\n    initType: function * YTextBindInitializer (os, model) {\n      var valArray = []\n      var idArray = yield* Y.Struct.List.map.call(this, model, function (c) {\n        valArray.push(c.content)\n        return JSON.stringify(c.id)\n      })\n      return new YTextBind(os, model.id, idArray, valArray)\n    }\n  })\n}\n","'use strict'\n\n/*\n  EventHandler is an helper class for constructing custom types.\n\n  Why: When constructing custom types, you sometimes want your types to work\n  synchronous: E.g.\n  ``` Synchronous\n  mytype.setSomething(\"yay\")\n  mytype.getSomething() === \"yay\"\n  ```\n  ``` Asynchronous\n  mytype.setSomething(\"yay\")\n  mytype.getSomething() === undefined\n  mytype.waitForSomething().then(function(){\n    mytype.getSomething() === \"yay\"\n  })\n\n  The structures usually work asynchronously (you have to wait for the\n  database request to finish). EventHandler will help you to make your type\n  synchronously.\n*/\nmodule.exports = function (Y) {\n  Y.utils = {}\n\n  class EventHandler {\n    /*\n      onevent: is called when the structure changes.\n\n      Note: \"awaiting opertations\" is used to denote operations that were\n      prematurely called. Events for received operations can not be executed until\n      all prematurely called operations were executed (\"waiting operations\")\n    */\n    constructor (onevent) {\n      this.waiting = []\n      this.awaiting = 0\n      this.onevent = onevent\n      this.eventListeners = []\n    }\n    /*\n      Call this when a new operation arrives. It will be executed right away if\n      there are no waiting operations, that you prematurely executed\n    */\n    receivedOp (op) {\n      if (this.awaiting <= 0) {\n        this.onevent([op])\n      } else {\n        this.waiting.push(Y.utils.copyObject(op))\n      }\n    }\n    /*\n      You created some operations, and you want the `onevent` function to be\n      called right away. Received operations will not be executed untill all\n      prematurely called operations are executed\n    */\n    awaitAndPrematurelyCall (ops) {\n      this.awaiting++\n      this.onevent(ops)\n    }\n    /*\n      Basic event listener boilerplate...\n      TODO: maybe put this in a different type..\n    */\n    addEventListener (f) {\n      this.eventListeners.push(f)\n    }\n    removeEventListener (f) {\n      this.eventListeners = this.eventListeners.filter(function (g) {\n        return f !== g\n      })\n    }\n    removeAllEventListeners () {\n      this.eventListeners = []\n    }\n    callEventListeners (event) {\n      for (var i in this.eventListeners) {\n        try {\n          this.eventListeners[i](event)\n        } catch (e) {\n          console.log('User events must not throw Errors!') // eslint-disable-line\n        }\n      }\n    }\n    /*\n      Call this when you successfully awaited the execution of n Insert operations\n    */\n    awaitedInserts (n) {\n      var ops = this.waiting.splice(this.waiting.length - n)\n      for (var oid = 0; oid < ops.length; oid++) {\n        var op = ops[oid]\n        for (var i = this.waiting.length - 1; i >= 0; i--) {\n          let w = this.waiting[i]\n          if (Y.utils.compareIds(op.left, w.id)) {\n            // include the effect of op in w\n            w.right = op.id\n            // exclude the effect of w in op\n            op.left = w.left\n          } else if (Y.utils.compareIds(op.right, w.id)) {\n            // similar..\n            w.left = op.id\n            op.right = w.right\n          }\n        }\n      }\n      this._tryCallEvents()\n    }\n    /*\n      Call this when you successfully awaited the execution of n Delete operations\n    */\n    awaitedDeletes (n, newLeft) {\n      var ops = this.waiting.splice(this.waiting.length - n)\n      for (var j in ops) {\n        var del = ops[j]\n        if (newLeft != null) {\n          for (var i in this.waiting) {\n            let w = this.waiting[i]\n            // We will just care about w.left\n            if (Y.utils.compareIds(del.target, w.left)) {\n              del.left = newLeft\n            }\n          }\n        }\n      }\n      this._tryCallEvents()\n    }\n    /* (private)\n      Try to execute the events for the waiting operations\n    */\n    _tryCallEvents () {\n      this.awaiting--\n      if (this.awaiting <= 0 && this.waiting.length > 0) {\n        var events = this.waiting\n        this.waiting = []\n        this.onevent(events)\n      }\n    }\n  }\n  Y.utils.EventHandler = EventHandler\n\n  /*\n    A wrapper for the definition of a custom type.\n    Every custom type must have three properties:\n\n    * createType\n      - Defines the model of a newly created custom type and returns the type\n    * initType\n      - Given a model, creates a custom type\n    * class\n      - the constructor of the custom type (e.g. in order to inherit from a type)\n  */\n  class CustomType { // eslint-disable-line\n    constructor (def) {\n      if (def.createType == null ||\n        def.initType == null ||\n        def.class == null\n      ) {\n        throw new Error('Custom type was not initialized correctly!')\n      }\n      this.createType = def.createType\n      this.initType = def.initType\n      this.class = def.class\n    }\n  }\n  Y.utils.CustomType = CustomType\n\n  /*\n    Make a flat copy of an object\n    (just copy properties)\n  */\n  function copyObject (o) {\n    var c = {}\n    for (var key in o) {\n      c[key] = o[key]\n    }\n    return c\n  }\n  Y.utils.copyObject = copyObject\n\n  /*\n    Defines a smaller relation on Id's\n  */\n  function smaller (a, b) {\n    return a[0] < b[0] || (a[0] === b[0] && a[1] < b[1])\n  }\n  Y.utils.smaller = smaller\n\n  function compareIds (id1, id2) {\n    if (id1 == null || id2 == null) {\n      if (id1 == null && id2 == null) {\n        return true\n      }\n      return false\n    }\n    if (id1[0] === id2[0] && id1[1] === id2[1]) {\n      return true\n    } else {\n      return false\n    }\n  }\n  Y.utils.compareIds = compareIds\n}\n","/* @flow */\n'use strict'\n\nrequire('./Connector.js')(Y)\nrequire('./Database.js')(Y)\nrequire('./Transaction.js')(Y)\nrequire('./Struct.js')(Y)\nrequire('./Utils.js')(Y)\nrequire('./Databases/RedBlackTree.js')(Y)\nrequire('./Databases/Memory.js')(Y)\nrequire('./Databases/IndexedDB.js')(Y)\nrequire('./Connectors/Test.js')(Y)\n\nvar requiringModules = {}\n\nmodule.exports = Y\n\nY.extend = function (name, value) {\n  Y[name] = value\n  var resolves = requiringModules[name]\n  if (requiringModules[name] != null) {\n    for (var i = 0; i < resolves.length; i++) {\n      resolves[i]()\n    }\n    delete requiringModules[name]\n  }\n}\n\nrequire('./Types/Array.js')(Y)\nrequire('./Types/Map.js')(Y)\nrequire('./Types/TextBind.js')(Y)\n\nfunction Y (opts) {\n  opts.types = opts.types != null ? 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\ No newline at end of file
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e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require==\"function\"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error(\"Cannot find module '\"+o+\"'\");throw f.code=\"MODULE_NOT_FOUND\",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require==\"function\"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})","'use strict'\n\nmodule.exports = function (Y) {\n  class AbstractConnector {\n    /*\n      opts contains the following information:\n       role : String Role of this client (\"master\" or \"slave\")\n       userId : String Uniquely defines the user.\n       debug: Boolean Whether to print debug messages (optional)\n    */\n    constructor (y, opts) {\n      this.y = y\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.isSynced = false\n      this.userEventListeners = []\n      this.whenSyncedListeners = []\n      this.currentSyncTarget = null\n      this.syncingClients = []\n      this.forwardToSyncingClients = opts.forwardToSyncingClients !== false\n      this.debug = opts.debug === true\n      this.broadcastedHB = false\n      this.syncStep2 = Promise.resolve()\n    }\n    reconnect () {\n    }\n    disconnect () {\n      this.connections = {}\n      this.isSynced = false\n      this.currentSyncTarget = null\n      this.broadcastedHB = false\n      this.syncingClients = []\n      this.whenSyncedListeners = []\n      return this.y.db.stopGarbageCollector()\n    }\n    setUserId (userId) {\n      this.userId = userId\n      return this.y.db.setUserId(userId)\n    }\n    onUserEvent (f) {\n      this.userEventListeners.push(f)\n    }\n    userLeft (user) {\n      delete this.connections[user]\n      if (user === this.currentSyncTarget) {\n        this.currentSyncTarget = null\n        this.findNextSyncTarget()\n      }\n      this.syncingClients = this.syncingClients.filter(function (cli) {\n        return cli !== user\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      if (this.currentSyncTarget == null) {\n        this.findNextSyncTarget()\n      }\n    }\n    // Execute a function _when_ we are connected.\n    // If not connected, wait until connected\n    whenSynced (f) {\n      if (this.isSynced) {\n        f()\n      } else {\n        this.whenSyncedListeners.push(f)\n      }\n    }\n    /*\n\n     returns false, if there is no sync target\n     true otherwise\n    */\n    findNextSyncTarget () {\n      if (this.currentSyncTarget != null || this.isSynced) {\n        return // \"The current sync has not finished!\"\n      }\n\n      var syncUser = null\n      for (var uid in this.connections) {\n        if (!this.connections[uid].isSynced) {\n          syncUser = uid\n          break\n        }\n      }\n      if (syncUser != null) {\n        var conn = this\n        this.currentSyncTarget = syncUser\n        this.y.db.requestTransaction(function *() {\n          conn.send(syncUser, {\n            type: 'sync step 1',\n            stateSet: yield* this.getStateSet(),\n            deleteSet: yield* this.getDeleteSet()\n          })\n        })\n      } else {\n        this.isSynced = true\n        // call when synced listeners\n        for (var f of this.whenSyncedListeners) {\n          f()\n        }\n        this.whenSyncedListeners = []\n        this.y.db.requestTransaction(function *() {\n          yield* this.garbageCollectAfterSync()\n        })\n      }\n    }\n    send (uid, message) {\n      if (this.debug) {\n        console.log(`send ${this.userId} -> ${uid}: ${message.type}`, m) // eslint-disable-line\n      }\n    }\n    /*\n      You received a raw message, and you know that it is intended for Yjs. Then call this function.\n    */\n    receiveMessage (sender, m) {\n      if (sender === this.userId) {\n        return\n      }\n      if (this.debug) {\n        console.log(`receive ${sender} -> ${this.userId}: ${m.type}`, JSON.parse(JSON.stringify(m))) // eslint-disable-line\n      }\n      if (m.type === 'sync step 1') {\n        // TODO: make transaction, stream the ops\n        let conn = this\n        this.y.db.requestTransaction(function *() {\n          var currentStateSet = yield* this.getStateSet()\n          yield* this.applyDeleteSet(m.deleteSet)\n\n          var ds = yield* this.getDeleteSet()\n          var ops = yield* this.getOperations(m.stateSet)\n          conn.send(sender, {\n            type: 'sync step 2',\n            os: ops,\n            stateSet: currentStateSet,\n            deleteSet: ds\n          })\n          if (this.forwardToSyncingClients) {\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          } else {\n            conn.send(sender, {\n              type: 'sync done'\n            })\n          }\n          conn._setSyncedWith(sender)\n        })\n      } else if (m.type === 'sync step 2') {\n        let conn = this\n        var broadcastHB = !this.broadcastedHB\n        this.broadcastedHB = true\n        var db = this.y.db\n        this.syncStep2 = new Promise(function (resolve) {\n          db.requestTransaction(function * () {\n            yield* this.applyDeleteSet(m.deleteSet)\n            this.store.apply(m.os)\n            db.requestTransaction(function * () {\n              var ops = yield* this.getOperations(m.stateSet)\n              if (ops.length > 0) {\n                m = {\n                  type: 'update',\n                  ops: ops\n                }\n                if (!broadcastHB) { // TODO: consider to broadcast here..\n                  conn.send(sender, m)\n                } else {\n                  // broadcast only once!\n                  conn.broadcast(m)\n                }\n              }\n              resolve()\n            })\n          })\n        })\n      } else if (m.type === 'sync done') {\n        var self = this\n        this.syncStep2.then(function () {\n          self._setSyncedWith(sender)\n        })\n      } else if (m.type === 'update') {\n        if (this.forwardToSyncingClients) {\n          for (var client of this.syncingClients) {\n            this.send(client, m)\n          }\n        }\n        this.y.db.apply(m.ops)\n      }\n    }\n    _setSyncedWith (user) {\n      var conn = this.connections[user]\n      if (conn != null) {\n        conn.isSynced = true\n      }\n      if (user === this.currentSyncTarget) {\n        this.currentSyncTarget = null\n        this.findNextSyncTarget()\n      }\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    */\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, 10)\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    /*\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    */\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  Y.AbstractConnector = AbstractConnector\n}\n","/* global getRandom, wait, async */\n'use strict'\n\nmodule.exports = function (Y) {\n  var globalRoom = {\n    users: {},\n    buffers: {},\n    removeUser: function (user) {\n      for (var i in this.users) {\n        this.users[i].userLeft(user)\n      }\n      delete this.users[user]\n      delete this.buffers[user]\n    },\n    addUser: function (connector) {\n      this.users[connector.userId] = connector\n      this.buffers[connector.userId] = []\n      for (var uname in this.users) {\n        if (uname !== connector.userId) {\n          var u = this.users[uname]\n          u.userJoined(connector.userId, 'master')\n          connector.userJoined(u.userId, 'master')\n        }\n      }\n    }\n  }\n  Y.utils.globalRoom = globalRoom\n\n  function flushOne () {\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].shift()\n      var user = globalRoom.users[userId]\n      user.receiveMessage(m[0], m[1])\n      return true\n    } else {\n      return false\n    }\n  }\n\n  // setInterval(flushOne, 10)\n\n  var userIdCounter = 0\n\n  class Test extends Y.AbstractConnector {\n    constructor (y, options) {\n      if (options === undefined) {\n        throw new Error('Options must not be undefined!')\n      }\n      options.role = 'master'\n      options.forwardToSyncingClients = false\n      super(y, options)\n      this.setUserId((userIdCounter++) + '').then(() => {\n        globalRoom.addUser(this)\n      })\n      this.globalRoom = globalRoom\n      this.syncingClientDuration = 0\n    }\n    receiveMessage (sender, m) {\n      super.receiveMessage(sender, JSON.parse(JSON.stringify(m)))\n    }\n    send (userId, message) {\n      var buffer = globalRoom.buffers[userId]\n      if (buffer != null) {\n        buffer.push(JSON.parse(JSON.stringify([this.userId, message])))\n      }\n    }\n    broadcast (message) {\n      for (var key in globalRoom.buffers) {\n        globalRoom.buffers[key].push(JSON.parse(JSON.stringify([this.userId, message])))\n      }\n    }\n    isDisconnected () {\n      return globalRoom.users[this.userId] == null\n    }\n    reconnect () {\n      if (this.isDisconnected()) {\n        globalRoom.addUser(this)\n        super.reconnect()\n      }\n      return this.flushAll()\n    }\n    disconnect () {\n      if (!this.isDisconnected()) {\n        globalRoom.removeUser(this.userId)\n        super.disconnect()\n      }\n      return wait()\n    }\n    flush () {\n      var self = this\n      return async(function * () {\n        yield wait()\n        while (globalRoom.buffers[self.userId].length > 0) {\n          var m = globalRoom.buffers[self.userId].shift()\n          this.receiveMessage(m[0], m[1])\n          yield wait()\n        }\n      })\n    }\n    flushAll () {\n      return new Promise(function (resolve) {\n        // flushes may result in more created operations,\n        // flush until there is nothing more to flush\n        function nextFlush () {\n          var c = flushOne()\n          if (c) {\n            while (flushOne()) {\n              // nop\n            }\n            wait().then(nextFlush)\n          } else {\n            wait().then(function () {\n              resolve()\n            })\n          }\n        }\n        // in the case that there are\n        // still actions that want to be performed\n        wait().then(nextFlush)\n      })\n    }\n    /*\n      Flushes an operation for some user..\n    */\n    flushOne () {\n      flushOne()\n    }\n  }\n\n  Y.Test = Test\n}\n","'use strict'\n\nmodule.exports = function (Y) {\n  /*\n    Partial definition of an OperationStore.\n    TODO: name it Database, operation store only holds operations.\n\n    A database definition must alse define the following methods:\n    * logTable() (optional)\n      - show relevant information information in a table\n    * requestTransaction(makeGen)\n      - request a transaction\n    * destroy()\n      - destroy the database\n  */\n  class AbstractDatabase {\n    constructor (y, opts) {\n      this.y = y\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\n        a property before you iterate over it!\n      */\n      // TODO: Use ES7 Weak Maps. This way types that are no longer user,\n      // wont be kept in memory.\n      this.initializedTypes = {}\n      this.whenUserIdSetListener = null\n      this.waitingTransactions = []\n      this.transactionInProgress = false\n      if (typeof YConcurrency_TestingMode !== 'undefined') {\n        this.executeOrder = []\n      }\n      this.gc1 = [] // first stage\n      this.gc2 = [] // second stage -> after that, remove the op\n      this.gcTimeout = opts.gcTimeout || 5000\n      var os = this\n      function garbageCollect () {\n        return new Promise((resolve) => {\n          os.requestTransaction(function * () {\n            if (os.y.connector != null && os.y.connector.isSynced) {\n              for (var i in os.gc2) {\n                var oid = os.gc2[i]\n                yield* this.garbageCollectOperation(oid)\n              }\n              os.gc2 = os.gc1\n              os.gc1 = []\n            }\n            if (os.gcTimeout > 0) {\n              os.gcInterval = setTimeout(garbageCollect, os.gcTimeout)\n            }\n            resolve()\n          })\n        })\n      }\n      this.garbageCollect = garbageCollect\n      if (this.gcTimeout > 0) {\n        garbageCollect()\n      }\n    }\n    addToDebug () {\n      if (typeof YConcurrency_TestingMode !== 'undefined') {\n        var command = Array.prototype.map.call(arguments, function (s) {\n          if (typeof s === 'string') {\n            return s\n          } else {\n            return JSON.stringify(s)\n          }\n        }).join('').replace(/\"/g, \"'\").replace(/,/g, ', ').replace(/:/g, ': ')\n        this.executeOrder.push(command)\n      }\n    }\n    getDebugData () {\n      console.log(this.executeOrder.join('\\n'))\n    }\n    stopGarbageCollector () {\n      var self = this\n      return new Promise(function (resolve) {\n        self.requestTransaction(function * () {\n          var ungc = self.gc1.concat(self.gc2)\n          self.gc1 = []\n          self.gc2 = []\n          for (var i in ungc) {\n            var op = yield* this.getOperation(ungc[i])\n            delete op.gc\n            yield* this.setOperation(op)\n          }\n          resolve()\n        })\n      })\n    }\n    /*\n      Try to add to GC.\n\n      TODO: rename this function\n\n      Rulez:\n      * Only gc if this user is online\n      * The most left element in a list must not be gc'd.\n        => There is at least one element in the list\n\n      returns true iff op was added to GC\n    */\n    addToGarbageCollector (op, left) {\n      if (\n        op.gc == null &&\n        op.deleted === true &&\n        this.y.connector.isSynced &&\n        left != null &&\n        left.deleted === true\n      ) {\n        op.gc = true\n        this.gc1.push(op.id)\n        return true\n      } else {\n        return false\n      }\n    }\n    removeFromGarbageCollector (op) {\n      function filter (o) {\n        return !Y.utils.compareIds(o, op.id)\n      }\n      this.gc1 = this.gc1.filter(filter)\n      this.gc2 = this.gc2.filter(filter)\n      delete op.gc\n    }\n    destroy () {\n      clearInterval(this.gcInterval)\n      this.gcInterval = null\n    }\n    setUserId (userId) {\n      var self = this\n      return new Promise(function (resolve) {\n        self.requestTransaction(function * () {\n          self.userId = userId\n          self.opClock = (yield* this.getState(userId)).clock\n          if (self.whenUserIdSetListener != null) {\n            self.whenUserIdSetListener()\n            self.whenUserIdSetListener = null\n          }\n          resolve()\n        })\n      })\n    }\n    whenUserIdSet (f) {\n      if (this.userId != null) {\n        f()\n      } else {\n        this.whenUserIdSetListener = f\n      }\n    }\n    getNextOpId () {\n      if (this.userId == null) {\n        throw new Error('OperationStore not yet initialized!')\n      }\n      return [this.userId, this.opClock++]\n    }\n    /*\n      Apply a list of operations.\n\n      * get a transaction\n      * check whether all Struct.*.requiredOps are in the OS\n      * check if it is an expected op (otherwise wait for it)\n      * check if was deleted, apply a delete operation after op was applied\n    */\n    apply (ops) {\n      for (var key in ops) {\n        var o = ops[key]\n        var required = Y.Struct[o.struct].requiredOps(o)\n        this.whenOperationsExist(required, o)\n      }\n    }\n    /*\n      op is executed as soon as every operation requested is available.\n      Note that Transaction can (and should) buffer requests.\n    */\n    whenOperationsExist (ids, op) {\n      if (ids.length > 0) {\n        let listener = {\n          op: op,\n          missing: ids.length\n        }\n\n        for (let key in ids) {\n          let id = ids[key]\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          op: op\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 key in exeNow) {\n          let o = exeNow[key].op\n          yield* store.tryExecute.call(this, o)\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 key in l) {\n              let listener = l[key]\n              let o = listener.op\n              if (--listener.missing === 0) {\n                yield* store.tryExecute.call(this, o)\n              }\n            }\n          }\n        }\n      })\n    }\n    /*\n      Actually execute an operation, when all expected operations are available.\n    */\n    * tryExecute (op) {\n      this.store.addToDebug('yield* this.store.tryExecute.call(this, ', JSON.stringify(op), ')')\n      if (op.struct === 'Delete') {\n        yield* Y.Struct.Delete.execute.call(this, op)\n        yield* this.store.operationAdded(this, op)\n      } else if ((yield* this.getOperation(op.id)) == null && !(yield* this.isGarbageCollected(op.id))) {\n        yield* Y.Struct[op.struct].execute.call(this, op)\n        yield* this.addOperation(op)\n        yield* this.store.operationAdded(this, op)\n      }\n    }\n    // called by a transaction when an operation is added\n    * operationAdded (transaction, op) {\n      if (op.struct === 'Delete') {\n        var target = yield* transaction.getOperation(op.target)\n        if (target != null) {\n          var type = transaction.store.initializedTypes[JSON.stringify(target.parent)]\n          if (type != null) {\n            yield* type._changed(transaction, {\n              struct: 'Delete',\n              target: op.target\n            })\n          }\n        }\n      } else {\n        // increase SS\n        var o = op\n        var state = yield* transaction.getState(op.id[0])\n        while (o != null && o.id[1] === state.clock && op.id[0] === o.id[0]) {\n          // either its a new operation (1. case), or it is an operation that was deleted, but is not yet in the OS\n          state.clock++\n          yield* transaction.checkDeleteStoreForState(state)\n          o = yield* transaction.os.findNext(o.id)\n        }\n        yield* transaction.setState(state)\n\n        // notify whenOperation listeners (by id)\n        var sid = JSON.stringify(op.id)\n        var l = this.listenersById[sid]\n        delete this.listenersById[sid]\n\n        if (l != null) {\n          for (var key in l) {\n            var listener = l[key]\n            if (--listener.missing === 0) {\n              this.whenOperationsExist([], listener.op)\n            }\n          }\n        }\n        var t = this.initializedTypes[JSON.stringify(op.parent)]\n        // notify parent, if it has been initialized as a custom type\n        if (t != null) {\n          yield* t._changed(transaction, Y.utils.copyObject(op))\n        }\n\n        // Delete if DS says this is actually deleted\n        if (!op.deleted && (yield* transaction.isDeleted(op.id))) {\n          var delop = {\n            struct: 'Delete',\n            target: op.id\n          }\n          yield* Y.Struct['Delete'].execute.call(transaction, delop)\n          if (t != null) {\n            yield* t._changed(transaction, delop)\n          }\n        }\n      }\n    }\n    getNextRequest () {\n      if (this.waitingTransactions.length === 0) {\n        this.transactionInProgress = false\n        return null\n      } else {\n        return this.waitingTransactions.shift()\n      }\n    }\n    requestTransaction (makeGen, callImmediately) {\n      if (callImmediately) {\n        this.transact(makeGen)\n      } else if (!this.transactionInProgress) {\n        this.transactionInProgress = true\n        var self = this\n        setTimeout(function () {\n          self.transact(makeGen)\n        }, 0)\n      } else {\n        this.waitingTransactions.push(makeGen)\n      }\n    }\n  }\n  Y.AbstractDatabase = AbstractDatabase\n}\n","'use strict'\n\n/*\n An operation also defines the structure of a type. This is why operation and\n structure are used interchangeably here.\n\n It must be of the type Object. I hope to achieve some performance\n improvements when working on databases that support the json format.\n\n An operation must have the following properties:\n\n * encode\n     - Encode the structure in a readable format (preferably string- todo)\n * decode (todo)\n     - decode structure to json\n * execute\n     - Execute the semantics of an operation.\n * requiredOps\n     - Operations that are required to execute this operation.\n*/\nmodule.exports = function (Y) {\n  var Struct = {\n    /* This is the only operation that is actually not a structure, because\n    it is not stored in the OS. This is why it _does not_ have an id\n\n    op = {\n      target: Id\n    }\n    */\n    Delete: {\n      encode: function (op) {\n        return op\n      },\n      requiredOps: function (op) {\n        return [] // [op.target]\n      },\n      execute: function * (op) {\n        return yield* this.deleteOperation(op.target)\n      }\n    },\n    Insert: {\n      /* {\n          content: any,\n          id: Id,\n          left: Id,\n          origin: Id,\n          right: Id,\n          parent: Id,\n          parentSub: string (optional), // child of Map type\n        }\n      */\n      encode: function (op) {\n        // TODO: you could not send the \"left\" property, then you also have to\n        // \"op.left = null\" in $execute or $decode\n        var e = {\n          id: op.id,\n          left: op.left,\n          right: op.right,\n          origin: op.origin,\n          parent: op.parent,\n          struct: op.struct\n        }\n        if (op.parentSub != null) {\n          e.parentSub = op.parentSub\n        }\n        if (op.opContent != null) {\n          e.opContent = op.opContent\n        } else {\n          e.content = op.content\n        }\n\n        return e\n      },\n      requiredOps: function (op) {\n        var ids = []\n        if (op.left != null) {\n          ids.push(op.left)\n        }\n        if (op.right != null) {\n          ids.push(op.right)\n        }\n        if (op.origin != null && !Y.utils.compareIds(op.left, op.origin)) {\n          ids.push(op.origin)\n        }\n        // if (op.right == null && op.left == null) {\n        ids.push(op.parent)\n\n        if (op.opContent != null) {\n          ids.push(op.opContent)\n        }\n        return ids\n      },\n      getDistanceToOrigin: function * (op) {\n        if (op.left == null) {\n          return 0\n        } else {\n          var d = 0\n          var o = yield* this.getOperation(op.left)\n          while (!Y.utils.compareIds(op.origin, (o ? o.id : null))) {\n            d++\n            if (o.left == null) {\n              break\n            } else {\n              o = yield* this.getOperation(o.left)\n            }\n          }\n          return d\n        }\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 i // loop counter\n        var distanceToOrigin = i = yield* Struct.Insert.getDistanceToOrigin.call(this, op) // most cases: 0 (starts from 0)\n        var o\n        var parent\n        var start\n\n        // find o. o is the first conflicting operation\n        if (op.left != null) {\n          o = yield* this.getOperation(op.left)\n          o = (o.right == null) ? null : yield* this.getOperation(o.right)\n        } else { // left == null\n          parent = yield* this.getOperation(op.parent)\n          let startId = op.parentSub ? parent.map[op.parentSub] : parent.start\n          start = startId == null ? null : yield* this.getOperation(startId)\n          o = start\n        }\n\n        // handle conflicts\n        while (true) {\n          if (o != null && !Y.utils.compareIds(o.id, op.right)) {\n            var oOriginDistance = yield* Struct.Insert.getDistanceToOrigin.call(this, o)\n            if (oOriginDistance === i) {\n              // case 1\n              if (o.id[0] < op.id[0]) {\n                op.left = o.id\n                distanceToOrigin = i + 1\n              }\n            } else if (oOriginDistance < i) {\n              // case 2\n              if (i - distanceToOrigin <= oOriginDistance) {\n                op.left = o.id\n                distanceToOrigin = i + 1\n              }\n            } else {\n              break\n            }\n            i++\n            o = o.right ? yield* this.getOperation(o.right) : null\n          } else {\n            break\n          }\n        }\n\n        // reconnect..\n        var left = null\n        var right = null\n        parent = parent || (yield* this.getOperation(op.parent))\n\n        // reconnect left and set right of op\n        if (op.left != null) {\n          left = yield* this.getOperation(op.left)\n          op.right = left.right\n          left.right = op.id\n\n          yield* this.setOperation(left)\n        } else {\n          op.right = op.parentSub ? parent.map[op.parentSub] || null : parent.start\n        }\n        // reconnect right\n        if (op.right != null) {\n          right = yield* this.getOperation(op.right)\n          right.left = op.id\n\n          // if right exists, and it is supposed to be gc'd. Remove it from the gc\n          if (right.gc != null) {\n            this.store.removeFromGarbageCollector(right)\n          }\n          yield* this.setOperation(right)\n        }\n\n        // update parents .map/start/end properties\n        if (op.parentSub != null) {\n          if (left == null) {\n            parent.map[op.parentSub] = op.id\n            yield* this.setOperation(parent)\n          }\n          // is a child of a map struct.\n          // Then also make sure that only the most left element is not deleted\n          if (op.right != null) {\n            yield* this.deleteOperation(op.right, true)\n          }\n          if (op.left != null) {\n            yield* this.deleteOperation(op.id, true)\n          }\n        } else {\n          if (right == null || left == null) {\n            if (right == null) {\n              parent.end = op.id\n            }\n            if (left == null) {\n              parent.start = op.id\n            }\n            yield* this.setOperation(parent)\n          }\n        }\n      }\n    },\n    List: {\n      /*\n      {\n        start: null,\n        end: null,\n        struct: \"List\",\n        type: \"\",\n        id: this.os.getNextOpId()\n      }\n      */\n      encode: function (op) {\n        return {\n          struct: 'List',\n          id: op.id,\n          type: op.type\n        }\n      },\n      requiredOps: function () {\n        /*\n        var 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        return []\n      },\n      execute: function * (op) {\n        op.start = null\n        op.end = null\n      },\n      ref: function * (op, pos) {\n        if (op.start == null) {\n          return null\n        }\n        var res = null\n        var o = yield* this.getOperation(op.start)\n\n        while (true) {\n          if (!o.deleted) {\n            res = o\n            pos--\n          }\n          if (pos >= 0 && o.right != null) {\n            o = (yield* this.getOperation(o.right))\n          } else {\n            break\n          }\n        }\n        return res\n      },\n      map: function * (o, f) {\n        o = o.start\n        var res = []\n        while (o != null) { // TODO: change to != (at least some convention)\n          var operation = yield* this.getOperation(o)\n          if (!operation.deleted) {\n            res.push(f(operation))\n          }\n          o = operation.right\n        }\n        return res\n      }\n    },\n    Map: {\n      /*\n        {\n          map: {},\n          struct: \"Map\",\n          type: \"\",\n          id: this.os.getNextOpId()\n        }\n      */\n      encode: function (op) {\n        return {\n          struct: 'Map',\n          type: op.type,\n          id: op.id,\n          map: {} // overwrite map!!\n        }\n      },\n      requiredOps: function () {\n        return []\n      },\n      execute: function * () {},\n      /*\n        Get a property by name\n      */\n      get: function * (op, name) {\n        var oid = op.map[name]\n        if (oid != null) {\n          var res = yield* this.getOperation(oid)\n          return (res == null || res.deleted) ? void 0 : (res.opContent == null\n            ? res.content : yield* this.getType(res.opContent))\n        }\n      },\n      /*\n        Delete a property by name\n      */\n      delete: function * (op, name) {\n        var v = op.map[name] || null\n        if (v != null) {\n          yield* Struct.Delete.create.call(this, {\n            target: v\n          })\n        }\n      }\n    }\n  }\n  Y.Struct = Struct\n}\n","'use strict'\n\n/*\n  Partial definition of a transaction\n\n  A transaction provides all the the async functionality on a database.\n\n  By convention, a transaction has the following properties:\n  * ss for StateSet\n  * os for OperationStore\n  * ds for DeleteStore\n\n  A transaction must also define the following methods:\n  * checkDeleteStoreForState(state)\n    - When increasing the state of a user, an operation with an higher id\n      may already be garbage collected, and therefore it will never be received.\n      update the state to reflect this knowledge. This won't call a method to save the state!\n  * getDeleteSet(id)\n    - Get the delete set in a readable format:\n      {\n        \"userX\": [\n          [5,1], // starting from position 5, one operations is deleted\n          [9,4]  // starting from position 9, four operations are deleted\n        ],\n        \"userY\": ...\n      }\n  * getOpsFromDeleteSet(ds) -- TODO: just call this.deleteOperation(id) here\n    - get a set of deletions that need to be applied in order to get to\n      achieve the state of the supplied ds\n  * setOperation(op)\n    - write `op` to the database.\n      Note: this is allowed to return an in-memory object.\n      E.g. the Memory adapter returns the object that it has in-memory.\n      Changing values on this object will be stored directly in the database\n      without calling this function. Therefore,\n      setOperation may have no functionality in some adapters. This also has\n      implications on the way we use operations that were served from the database.\n      We try not to call copyObject, if not necessary.\n  * addOperation(op)\n    - add an operation to the database.\n      This may only be called once for every op.id\n      Must return a function that returns the next operation in the database (ordered by id)\n  * getOperation(id)\n  * removeOperation(id)\n    - remove an operation from the database. This is called when an operation\n      is garbage collected.\n  * setState(state)\n    - `state` is of the form\n      {\n        user: \"1\",\n        clock: 4\n      } <- meaning that we have four operations from user \"1\"\n           (with these id's respectively: 0, 1, 2, and 3)\n  * getState(user)\n  * getStateVector()\n    - Get the state of the OS in the form\n    [{\n      user: \"userX\",\n      clock: 11\n    },\n     ..\n    ]\n  * getStateSet()\n    - Get the state of the OS in the form\n    {\n      \"userX\": 11,\n      \"userY\": 22\n    }\n   * getOperations(startSS)\n     - Get the all the operations that are necessary in order to achive the\n       stateSet of this user, starting from a stateSet supplied by another user\n   * makeOperationReady(ss, op)\n     - this is called only by `getOperations(startSS)`. It makes an operation\n       applyable on a given SS.\n*/\nmodule.exports = function (Y) {\n  class Transaction {\n    /*\n      Get a type based on the id of its model.\n      If it does not exist yes, create it.\n      TODO: delete type from store.initializedTypes[id] when corresponding id was deleted!\n    */\n    * getType (id) {\n      var sid = JSON.stringify(id)\n      var t = this.store.initializedTypes[sid]\n      if (t == null) {\n        var op = yield* this.getOperation(id)\n        if (op != null) {\n          t = yield* Y[op.type].initType.call(this, this.store, op)\n          this.store.initializedTypes[sid] = t\n        }\n      }\n      return t\n    }\n    /*\n      Apply operations that this user created (no remote ones!)\n        * does not check for Struct.*.requiredOps()\n        * also broadcasts it through the connector\n    */\n    * applyCreatedOperations (ops) {\n      var send = []\n      for (var i = 0; i < ops.length; i++) {\n        var op = ops[i]\n        yield* this.store.tryExecute.call(this, op)\n        send.push(Y.Struct[op.struct].encode(op))\n      }\n      if (!this.store.y.connector.isDisconnected()) {\n        this.store.y.connector.broadcast({\n          type: 'update',\n          ops: send\n        })\n      }\n    }\n\n    * deleteList (start) {\n      if (this.store.y.connector.isSynced) {\n        while (start != null && this.store.y.connector.isSynced) {\n          start = (yield* this.getOperation(start))\n          start.gc = true\n          yield* this.setOperation(start)\n          // TODO: will always reset the parent..\n          this.store.gc1.push(start.id)\n          start = start.right\n        }\n      } else {\n        // TODO: when not possible??? do later in (gcWhenSynced)\n      }\n    }\n\n    /*\n      Mark an operation as deleted, and add it to the GC, if possible.\n    */\n    * deleteOperation (targetId, preventCallType) {\n      var target = yield* this.getOperation(targetId)\n      var callType = false\n\n      if (target == null || !target.deleted) {\n        yield* this.markDeleted(targetId)\n      }\n\n      if (target != null && target.gc == null) {\n        if (!target.deleted) {\n          callType = true\n          // set deleted & notify type\n          target.deleted = true\n          /*\n          if (!preventCallType) {\n            var type = this.store.initializedTypes[JSON.stringify(target.parent)]\n            if (type != null) {\n              yield* type._changed(this, {\n                struct: 'Delete',\n                target: targetId\n              })\n            }\n          }\n          */\n          // delete containing lists\n          if (target.start != null) {\n            // TODO: don't do it like this .. -.-\n            yield* this.deleteList(target.start)\n            yield* this.deleteList(target.id)\n          }\n          if (target.map != null) {\n            for (var name in target.map) {\n              yield* this.deleteList(target.map[name])\n            }\n            // TODO: here to..  (see above)\n            yield* this.deleteList(target.id)\n          }\n          if (target.opContent != null) {\n            yield* this.deleteOperation(target.opContent)\n            target.opContent = null\n          }\n        }\n        var left = target.left != null ? yield* this.getOperation(target.left) : null\n\n        this.store.addToGarbageCollector(target, left)\n\n        // set here because it was deleted and/or gc'd\n        yield* this.setOperation(target)\n\n        /*\n          Check if it is possible to add right to the gc.\n          Because this delete can't be responsible for left being gc'd,\n          we don't have to add left to the gc..\n        */\n        var right = target.right != null ? yield* this.getOperation(target.right) : null\n        if (\n          right != null &&\n          this.store.addToGarbageCollector(right, target)\n        ) {\n          yield* this.setOperation(right)\n        }\n        return callType\n      }\n    }\n    /*\n      Mark an operation as deleted&gc'd\n    */\n    * markGarbageCollected (id) {\n      // this.mem.push([\"gc\", id]);\n      var n = yield* this.markDeleted(id)\n      if (!n.gc) {\n        if (n.id[1] < id[1]) {\n          // un-extend left\n          var newlen = n.len - (id[1] - n.id[1])\n          n.len -= newlen\n          yield* this.ds.put(n)\n          n = {id: id, len: newlen, gc: false}\n          yield* this.ds.put(n)\n        }\n        // get prev&next before adding a new operation\n        var prev = yield* this.ds.findPrev(id)\n        var next = yield* this.ds.findNext(id)\n\n        if (id[1] < n.id[1] + n.len - 1) {\n          // un-extend right\n          yield* this.ds.put({id: [id[0], id[1] + 1], len: n.len - 1, gc: false})\n          n.len = 1\n        }\n        // set gc'd\n        n.gc = true\n        // can extend left?\n        if (\n          prev != null &&\n          prev.gc &&\n          Y.utils.compareIds([prev.id[0], prev.id[1] + prev.len], n.id)\n        ) {\n          prev.len += n.len\n          yield* this.ds.delete(n.id)\n          n = prev\n          // ds.put n here?\n        }\n        // can extend right?\n        if (\n          next != null &&\n          next.gc &&\n          Y.utils.compareIds([n.id[0], n.id[1] + n.len], next.id)\n        ) {\n          n.len += next.len\n          yield* this.ds.delete(next.id)\n        }\n        yield* this.ds.put(n)\n      }\n    }\n    /*\n      Mark an operation as deleted.\n\n      returns the delete node\n    */\n    * markDeleted (id) {\n      // this.mem.push([\"del\", id]);\n      var n = yield* this.ds.findWithUpperBound(id)\n      if (n != null && n.id[0] === id[0]) {\n        if (n.id[1] <= id[1] && id[1] < n.id[1] + n.len) {\n          // already deleted\n          return n\n        } else if (n.id[1] + n.len === id[1] && !n.gc) {\n          // can extend existing deletion\n          n.len++\n        } else {\n          // cannot extend left\n          n = {id: id, len: 1, gc: false}\n          yield* this.ds.put(n)\n        }\n      } else {\n        // cannot extend left\n        n = {id: id, len: 1, gc: false}\n        yield* this.ds.put(n)\n      }\n      // can extend right?\n      var next = yield* this.ds.findNext(n.id)\n      if (\n        next != null &&\n        Y.utils.compareIds([n.id[0], n.id[1] + n.len], next.id) &&\n        !next.gc\n      ) {\n        n.len = n.len + next.len\n        yield* this.ds.delete(next.id)\n      }\n      yield* this.ds.put(n)\n      return n\n    }\n    /*\n      Call this method when the client is connected&synced with the\n      other clients (e.g. master). This will query the database for\n      operations that can be gc'd and add them to the garbage collector.\n    */\n    * garbageCollectAfterSync () {\n      yield* this.os.iterate(this, null, null, function * (op) {\n        if (op.deleted && op.left != null) {\n          var left = yield* this.getOperation(op.left)\n          this.store.addToGarbageCollector(op, left)\n        }\n      })\n    }\n    /*\n      Really remove an op and all its effects.\n      The complicated case here is the Insert operation:\n      * reset left\n      * reset right\n      * reset parent.start\n      * reset parent.end\n      * reset origins of all right ops\n    */\n    * garbageCollectOperation (id) {\n      this.store.addToDebug('yield* this.garbageCollectOperation(', id, ')')\n      // check to increase the state of the respective user\n      var state = yield* this.getState(id[0])\n      if (state.clock === id[1]) {\n        state.clock++\n        // also check if more expected operations were gc'd\n        yield* this.checkDeleteStoreForState(state)\n        // then set the state\n        yield* this.setState(state)\n      }\n      yield* this.markGarbageCollected(id)\n\n      // if op exists, then clean that mess up..\n      var o = yield* this.getOperation(id)\n      if (o != null) {\n        /*\n        if (!o.deleted) {\n          yield* this.deleteOperation(id)\n          o = yield* this.getOperation(id)\n        }\n        */\n\n        // remove gc'd op from the left op, if it exists\n        if (o.left != null) {\n          var left = yield* this.getOperation(o.left)\n          left.right = o.right\n          yield* this.setOperation(left)\n        }\n        // remove gc'd op from the right op, if it exists\n        // also reset origins of right ops\n        if (o.right != null) {\n          var right = yield* this.getOperation(o.right)\n          right.left = o.left\n          if (Y.utils.compareIds(right.origin, o.id)) { // rights origin is o\n            // find new origin of right ops\n            // origin is the first left deleted operation\n            var neworigin = o.left\n            while (neworigin != null) {\n              var neworigin_ = yield* this.getOperation(neworigin)\n              if (neworigin_.deleted) {\n                break\n              }\n              neworigin = neworigin_.left\n            }\n\n            // reset origin of right\n            right.origin = neworigin\n\n            // reset origin of all right ops (except first right - duh!),\n            // until you find origin pointer to the left of o\n            var i = right.right == null ? null : yield* this.getOperation(right.right)\n            var ids = [o.id, o.right]\n            while (i != null && ids.some(function (id) {\n              return Y.utils.compareIds(id, i.origin)\n            })) {\n              if (Y.utils.compareIds(i.origin, o.id)) {\n                // reset origin of i\n                i.origin = neworigin\n                yield* this.setOperation(i)\n              }\n              // get next i\n              i = i.right == null ? null : yield* this.getOperation(i.right)\n            }\n          } /* otherwise, rights origin is to the left of o,\n               then there is no right op (from o), that origins in o */\n          yield* this.setOperation(right)\n        }\n\n        if (o.parent != null) {\n          // remove gc'd op from parent, if it exists\n          var parent = yield* this.getOperation(o.parent)\n          var setParent = false // whether to save parent to the os\n          if (o.parentSub != null) {\n            if (Y.utils.compareIds(parent.map[o.parentSub], o.id)) {\n              setParent = true\n              parent.map[o.parentSub] = o.right\n            }\n          } else {\n            if (Y.utils.compareIds(parent.start, o.id)) {\n              // gc'd op is the start\n              setParent = true\n              parent.start = o.right\n            }\n            if (Y.utils.compareIds(parent.end, o.id)) {\n              // gc'd op is the end\n              setParent = true\n              parent.end = o.left\n            }\n          }\n          if (setParent) {\n            yield* this.setOperation(parent)\n          }\n        }\n        // finally remove it from the os\n        yield* this.removeOperation(o.id)\n      }\n    }\n    * checkDeleteStoreForState (state) {\n      var n = yield* this.ds.findWithUpperBound([state.user, state.clock])\n      if (n != null && n.id[0] === state.user && n.gc) {\n        state.clock = Math.max(state.clock, n.id[1] + n.len)\n      }\n    }\n    /*\n      apply a delete set in order to get\n      the state of the supplied ds\n    */\n    * applyDeleteSet (ds) {\n      var deletions = []\n      function createDeletions (user, start, len, gc) {\n        for (var c = start; c < start + len; c++) {\n          deletions.push([user, c, gc])\n        }\n      }\n\n      for (var user in ds) {\n        var dv = ds[user]\n        var pos = 0\n        var d = dv[pos]\n        yield* this.ds.iterate(this, [user, 0], [user, Number.MAX_VALUE], function * (n) {\n          // cases:\n          // 1. d deletes something to the right of n\n          //  => go to next n (break)\n          // 2. d deletes something to the left of n\n          //  => create deletions\n          //  => reset d accordingly\n          //  *)=> if d doesn't delete anything anymore, go to next d (continue)\n          // 3. not 2) and d deletes something that also n deletes\n          //  => reset d so that it doesn't contain n's deletion\n          //  *)=> if d does not delete anything anymore, go to next d (continue)\n          while (d != null) {\n            var diff = 0 // describe the diff of length in 1) and 2)\n            if (n.id[1] + n.len <= d[0]) {\n              // 1)\n              break\n            } else if (d[0] < n.id[1]) {\n              // 2)\n              // delete maximum the len of d\n              // else delete as much as possible\n              diff = Math.min(n.id[1] - d[0], d[1])\n              createDeletions(user, d[0], diff, d[2])\n            } else {\n              // 3)\n              diff = n.id[1] + n.len - d[0] // never null (see 1)\n              if (d[2] && !n.gc) {\n                // d marks as gc'd but n does not\n                // then delete either way\n                createDeletions(user, d[0], Math.min(diff, d[1]), d[2])\n              }\n            }\n            if (d[1] <= diff) {\n              // d doesn't delete anything anymore\n              d = dv[++pos]\n            } else {\n              d[0] = d[0] + diff // reset pos\n              d[1] = d[1] - diff // reset length\n            }\n          }\n        })\n        // for the rest.. just apply it\n        for (; pos < dv.length; pos++) {\n          d = dv[pos]\n          createDeletions(user, d[0], d[1], d[2])\n        }\n      }\n      for (var i in deletions) {\n        var del = deletions[i]\n        var id = [del[0], del[1]]\n        // always try to delete..\n        var addOperation = yield* this.deleteOperation(id)\n        if (addOperation) {\n          // TODO:.. really .. here? You could prevent calling all these functions in operationAdded\n          yield* this.store.operationAdded(this, {struct: 'Delete', target: id})\n        }\n        if (del[2]) {\n          // gc\n          yield* this.garbageCollectOperation(id)\n        }\n      }\n    }\n    * isGarbageCollected (id) {\n      var n = yield* this.ds.findWithUpperBound(id)\n      return n != null && n.id[0] === id[0] && id[1] < n.id[1] + n.len && n.gc\n    }\n    /*\n      A DeleteSet (ds) describes all the deleted ops in the OS\n    */\n    * getDeleteSet () {\n      var ds = {}\n      yield* this.ds.iterate(this, null, null, function * (n) {\n        var user = n.id[0]\n        var counter = n.id[1]\n        var len = n.len\n        var gc = n.gc\n        var dv = ds[user]\n        if (dv === void 0) {\n          dv = []\n          ds[user] = dv\n        }\n        dv.push([counter, len, gc])\n      })\n      return ds\n    }\n    * isDeleted (id) {\n      var n = yield* this.ds.findWithUpperBound(id)\n      return n != null && n.id[0] === id[0] && id[1] < n.id[1] + n.len\n    }\n    * setOperation (op) {\n      yield* this.os.put(op)\n      return op\n    }\n    * addOperation (op) {\n      yield* this.os.put(op)\n    }\n    * getOperation (id) {\n      return yield* this.os.find(id)\n    }\n    * removeOperation (id) {\n      yield* this.os.delete(id)\n    }\n    * setState (state) {\n      var val = {\n        id: [state.user],\n        clock: state.clock\n      }\n      // TODO: find a way to skip this step.. (after implementing some dbs..)\n      if (yield* this.ss.find([state.user])) {\n        yield* this.ss.put(val)\n      } else {\n        yield* this.ss.put(val)\n      }\n    }\n    * getState (user) {\n      var n\n      var clock = (n = yield* this.ss.find([user])) == null ? null : n.clock\n      if (clock == null) {\n        clock = 0\n      }\n      return {\n        user: user,\n        clock: clock\n      }\n    }\n    * getStateVector () {\n      var stateVector = []\n      yield* this.ss.iterate(this, null, null, function * (n) {\n        stateVector.push({\n          user: n.id[0],\n          clock: n.clock\n        })\n      })\n      return stateVector\n    }\n    * getStateSet () {\n      var ss = {}\n      yield* this.ss.iterate(this, null, null, function * (n) {\n        ss[n.id[0]] = n.clock\n      })\n      return ss\n    }\n    * getOperations (startSS) {\n      // TODO: use bounds here!\n      if (startSS == null) {\n        startSS = {}\n      }\n      var ops = []\n\n      var endSV = yield* this.getStateVector()\n      for (var endState of endSV) {\n        var user = endState.user\n        if (user === '_') {\n          continue\n        }\n        var startPos = startSS[user] || 0\n\n        yield* this.os.iterate(this, [user, startPos], [user, Number.MAX_VALUE], function * (op) {\n          ops.push(op)\n        })\n      }\n      var res = []\n      for (var op of ops) {\n        res.push(yield* this.makeOperationReady(startSS, op))\n      }\n      return res\n    }\n    /*\n      Here, we make op executable for the receiving user.\n\n      Notes:\n        startSS: denotes to the SV that the remote user sent\n        currSS:  denotes to the state vector that the user should have if he\n                 applies all already sent operations (increases is each step)\n\n      We face several problems:\n      * Execute op as is won't work because ops depend on each other\n       -> find a way so that they do not anymore\n      * When changing left, must not go more to the left than the origin\n      * When changing right, you have to consider that other ops may have op\n        as their origin, this means that you must not set one of these ops\n        as the new right (interdependencies of ops)\n      * can't just go to the right until you find the first known operation,\n        With currSS\n          -> interdependency of ops is a problem\n        With startSS\n          -> leads to inconsistencies when two users join at the same time.\n             Then the position depends on the order of execution -> error!\n\n        Solution:\n        -> re-create originial situation\n          -> set op.left = op.origin (which never changes)\n          -> set op.right\n               to the first operation that is known (according to startSS)\n               or to the first operation that has an origin that is not to the\n               right of op.\n          -> Enforces unique execution order -> happy user\n\n        Improvements: TODO\n          * Could set left to origin, or the first known operation\n            (startSS or currSS.. ?)\n            -> Could be necessary when I turn GC again.\n            -> Is a bad(ish) idea because it requires more computation\n    */\n    * makeOperationReady (startSS, op) {\n      op = Y.Struct[op.struct].encode(op)\n      op = Y.utils.copyObject(op)\n      var o = op\n      var ids = [op.id]\n      // search for the new op.right\n      // it is either the first known op (according to startSS)\n      // or the o that has no origin to the right of op\n      // (this is why we use the ids array)\n      while (o.right != null) {\n        var right = yield* this.getOperation(o.right)\n        if (o.right[1] < (startSS[o.right[0]] || 0) || !ids.some(function (id) {\n          return Y.utils.compareIds(id, right.origin)\n        })) {\n          break\n        }\n        ids.push(o.right)\n        o = right\n      }\n      op.right = o.right\n      op.left = op.origin\n      return op\n    }\n  }\n  Y.Transaction = Transaction\n}\n","'use strict'\n\nmodule.exports = function (Y) {\n  class YMap {\n    constructor (os, model, contents, opContents) {\n      this._model = model.id\n      this.os = os\n      this.map = Y.utils.copyObject(model.map)\n      this.contents = contents\n      this.opContents = opContents\n      this.eventHandler = new Y.utils.EventHandler(ops => {\n        var userEvents = []\n        for (var i in ops) {\n          var op = ops[i]\n          var oldValue\n          // key is the name to use to access (op)content\n          var key = op.struct === 'Delete' ? op.key : op.parentSub\n\n          // compute oldValue\n          if (this.opContents[key] != null) {\n            let prevType = this.opContents[key]\n            oldValue = () => {// eslint-disable-line\n              return new Promise((resolve) => {\n                this.os.requestTransaction(function *() {// eslint-disable-line\n                  resolve(yield* this.getType(prevType))\n                })\n              })\n            }\n          } else {\n            oldValue = this.contents[key]\n          }\n          // compute op event\n          if (op.struct === 'Insert') {\n            if (op.left === null) {\n              if (op.opContent != null) {\n                delete this.contents[key]\n                if (op.deleted) {\n                  delete this.opContents[key]\n                } else {\n                  this.opContents[key] = op.opContent\n                }\n              } else {\n                delete this.opContents[key]\n                if (op.deleted) {\n                  delete this.contents[key]\n                } else {\n                  this.contents[key] = op.content\n                }\n              }\n              this.map[key] = op.id\n              var insertEvent = {\n                name: key,\n                object: this\n              }\n              if (oldValue === undefined) {\n                insertEvent.type = 'add'\n              } else {\n                insertEvent.type = 'update'\n                insertEvent.oldValue = oldValue\n              }\n              userEvents.push(insertEvent)\n            }\n          } else if (op.struct === 'Delete') {\n            if (Y.utils.compareIds(this.map[key], op.target)) {\n              delete this.opContents[key]\n              delete this.contents[key]\n              var deleteEvent = {\n                name: key,\n                object: this,\n                oldValue: oldValue,\n                type: 'delete'\n              }\n              userEvents.push(deleteEvent)\n            }\n          } else {\n            throw new Error('Unexpected Operation!')\n          }\n        }\n        this.eventHandler.callEventListeners(userEvents)\n      })\n    }\n    get (key) {\n      // return property.\n      // if property does not exist, return null\n      // if property is a type, return a promise\n      if (key == null) {\n        throw new Error('You must specify key!')\n      }\n      if (this.opContents[key] == null) {\n        return this.contents[key]\n      } else {\n        return new Promise((resolve) => {\n          var oid = this.opContents[key]\n          this.os.requestTransaction(function *() {\n            resolve(yield* this.getType(oid))\n          })\n        })\n      }\n    }\n    /*\n      If there is a primitive (not a custom type), then return it.\n      Returns all primitive values, if propertyName is specified!\n      Note: modifying the return value could result in inconsistencies!\n        -- so make sure to copy it first!\n    */\n    getPrimitive (key) {\n      if (key == null) {\n        return Y.utils.copyObject(this.contents)\n      } else {\n        return this.contents[key]\n      }\n    }\n    delete (key) {\n      var right = this.map[key]\n      if (right != null) {\n        var del = {\n          target: right,\n          struct: 'Delete'\n        }\n        var eventHandler = this.eventHandler\n        var modDel = Y.utils.copyObject(del)\n        modDel.key = key\n        eventHandler.awaitAndPrematurelyCall([modDel])\n        this.os.requestTransaction(function *() {\n          yield* this.applyCreatedOperations([del])\n          eventHandler.awaitedDeletes(1)\n        })\n      }\n    }\n    set (key, value) {\n      // set property.\n      // if property is a type, return a promise\n      // if not, apply immediately on this type an call event\n\n      var right = this.map[key] || null\n      var insert = {\n        left: null,\n        right: right,\n        origin: null,\n        parent: this._model,\n        parentSub: key,\n        struct: 'Insert'\n      }\n      return new Promise((resolve) => {\n        if (value instanceof Y.utils.CustomType) {\n          // construct a new type\n          this.os.requestTransaction(function *() {\n            var typeid = yield* value.createType.call(this)\n            var type = yield* this.getType(typeid)\n            insert.opContent = typeid\n            insert.id = this.store.getNextOpId()\n            yield* this.applyCreatedOperations([insert])\n            resolve(type)\n          })\n        } else {\n          insert.content = value\n          insert.id = this.os.getNextOpId()\n          var eventHandler = this.eventHandler\n          eventHandler.awaitAndPrematurelyCall([insert])\n\n          this.os.requestTransaction(function *() {\n            yield* this.applyCreatedOperations([insert])\n            eventHandler.awaitedInserts(1)\n          })\n          resolve(value)\n        }\n      })\n    }\n    observe (f) {\n      this.eventHandler.addEventListener(f)\n    }\n    unobserve (f) {\n      this.eventHandler.removeEventListener(f)\n    }\n    /*\n      Observe a path.\n\n      E.g.\n      ```\n      o.set('textarea', Y.TextBind)\n      o.observePath(['textarea'], function(t){\n        // is called whenever textarea is replaced\n        t.bind(textarea)\n      })\n\n      returns a Promise that contains a function that removes the observer from the path.\n    */\n    observePath (path, f) {\n      var self = this\n      function observeProperty (events) {\n        // call f whenever path changes\n        for (var i = 0; i < events.length; i++) {\n          var event = events[i]\n          if (event.name === propertyName) {\n            // call this also for delete events!\n            var property = self.get(propertyName)\n            if (property instanceof Promise) {\n              property.then(f)\n            } else {\n              f(property)\n            }\n          }\n        }\n      }\n\n      if (path.length < 1) {\n        throw new Error('Path must contain at least one element!')\n      } else if (path.length === 1) {\n        var propertyName = path[0]\n        var property = self.get(propertyName)\n        if (property instanceof Promise) {\n          property.then(f)\n        } else {\n          f(property)\n        }\n        this.observe(observeProperty)\n        return Promise.resolve(function () {\n          self.unobserve(f)\n        })\n      } else {\n        var deleteChildObservers\n        var resetObserverPath = function () {\n          var promise = self.get(path[0])\n          if (!promise instanceof Promise) {\n            // its either not defined or a primitive value\n            promise = self.set(path[0], Y.Map)\n          }\n          return promise.then(function (map) {\n            return map.observePath(path.slice(1), f)\n          }).then(function (_deleteChildObservers) {\n            // update deleteChildObservers\n            deleteChildObservers = _deleteChildObservers\n            return Promise.resolve() // Promise does not return anything\n          })\n        }\n        var observer = function (events) {\n          for (var e in events) {\n            var event = events[e]\n            if (event.name === path[0]) {\n              deleteChildObservers()\n              if (event.type === 'add' || event.type === 'update') {\n                resetObserverPath()\n              }\n              // TODO: what about the delete events?\n            }\n          }\n        }\n        self.observe(observer)\n        return resetObserverPath().then(\n          // this promise contains a function that deletes all the child observers\n          // and how to unobserve the observe from this object\n          Promise.resolve(function () {\n            deleteChildObservers()\n            self.unobserve(observer)\n          })\n        )\n      }\n    }\n    * _changed (transaction, op) {\n      if (op.struct === 'Delete') {\n        op.key = (yield* transaction.getOperation(op.target)).parentSub\n      }\n      this.eventHandler.receivedOp(op)\n    }\n  }\n  Y.Map = new Y.utils.CustomType({\n    class: YMap,\n    createType: function * YMapCreator () {\n      var modelid = this.store.getNextOpId()\n      var model = {\n        map: {},\n        struct: 'Map',\n        type: 'Map',\n        id: modelid\n      }\n      yield* this.applyCreatedOperations([model])\n      return modelid\n    },\n    initType: function * YMapInitializer (os, model) {\n      var contents = {}\n      var opContents = {}\n      var map = model.map\n      for (var name in map) {\n        var op = yield* this.getOperation(map[name])\n        if (op.opContent != null) {\n          opContents[name] = op.opContent\n        } else {\n          contents[name] = op.content\n        }\n      }\n      return new YMap(os, model, contents, opContents)\n    }\n  })\n}\n","'use strict'\n\n/*\n  EventHandler is an helper class for constructing custom types.\n\n  Why: When constructing custom types, you sometimes want your types to work\n  synchronous: E.g.\n  ``` Synchronous\n  mytype.setSomething(\"yay\")\n  mytype.getSomething() === \"yay\"\n  ```\n  ``` Asynchronous\n  mytype.setSomething(\"yay\")\n  mytype.getSomething() === undefined\n  mytype.waitForSomething().then(function(){\n    mytype.getSomething() === \"yay\"\n  })\n\n  The structures usually work asynchronously (you have to wait for the\n  database request to finish). EventHandler will help you to make your type\n  synchronously.\n*/\nmodule.exports = function (Y) {\n  Y.utils = {}\n\n  class EventHandler {\n    /*\n      onevent: is called when the structure changes.\n\n      Note: \"awaiting opertations\" is used to denote operations that were\n      prematurely called. Events for received operations can not be executed until\n      all prematurely called operations were executed (\"waiting operations\")\n    */\n    constructor (onevent) {\n      this.waiting = []\n      this.awaiting = 0\n      this.onevent = onevent\n      this.eventListeners = []\n    }\n    /*\n      Call this when a new operation arrives. It will be executed right away if\n      there are no waiting operations, that you prematurely executed\n    */\n    receivedOp (op) {\n      if (this.awaiting <= 0) {\n        this.onevent([op])\n      } else {\n        this.waiting.push(Y.utils.copyObject(op))\n      }\n    }\n    /*\n      You created some operations, and you want the `onevent` function to be\n      called right away. Received operations will not be executed untill all\n      prematurely called operations are executed\n    */\n    awaitAndPrematurelyCall (ops) {\n      this.awaiting++\n      this.onevent(ops)\n    }\n    /*\n      Basic event listener boilerplate...\n      TODO: maybe put this in a different type..\n    */\n    addEventListener (f) {\n      this.eventListeners.push(f)\n    }\n    removeEventListener (f) {\n      this.eventListeners = this.eventListeners.filter(function (g) {\n        return f !== g\n      })\n    }\n    removeAllEventListeners () {\n      this.eventListeners = []\n    }\n    callEventListeners (event) {\n      for (var i in this.eventListeners) {\n        try {\n          this.eventListeners[i](event)\n        } catch (e) {\n          console.log('User events must not throw Errors!') // eslint-disable-line\n        }\n      }\n    }\n    /*\n      Call this when you successfully awaited the execution of n Insert operations\n    */\n    awaitedInserts (n) {\n      var ops = this.waiting.splice(this.waiting.length - n)\n      for (var oid = 0; oid < ops.length; oid++) {\n        var op = ops[oid]\n        for (var i = this.waiting.length - 1; i >= 0; i--) {\n          let w = this.waiting[i]\n          if (Y.utils.compareIds(op.left, w.id)) {\n            // include the effect of op in w\n            w.right = op.id\n            // exclude the effect of w in op\n            op.left = w.left\n          } else if (Y.utils.compareIds(op.right, w.id)) {\n            // similar..\n            w.left = op.id\n            op.right = w.right\n          }\n        }\n      }\n      this._tryCallEvents()\n    }\n    /*\n      Call this when you successfully awaited the execution of n Delete operations\n    */\n    awaitedDeletes (n, newLeft) {\n      var ops = this.waiting.splice(this.waiting.length - n)\n      for (var j in ops) {\n        var del = ops[j]\n        if (newLeft != null) {\n          for (var i in this.waiting) {\n            let w = this.waiting[i]\n            // We will just care about w.left\n            if (Y.utils.compareIds(del.target, w.left)) {\n              del.left = newLeft\n            }\n          }\n        }\n      }\n      this._tryCallEvents()\n    }\n    /* (private)\n      Try to execute the events for the waiting operations\n    */\n    _tryCallEvents () {\n      this.awaiting--\n      if (this.awaiting <= 0 && this.waiting.length > 0) {\n        var events = this.waiting\n        this.waiting = []\n        this.onevent(events)\n      }\n    }\n  }\n  Y.utils.EventHandler = EventHandler\n\n  /*\n    A wrapper for the definition of a custom type.\n    Every custom type must have three properties:\n\n    * createType\n      - Defines the model of a newly created custom type and returns the type\n    * initType\n      - Given a model, creates a custom type\n    * class\n      - the constructor of the custom type (e.g. in order to inherit from a type)\n  */\n  class CustomType { // eslint-disable-line\n    constructor (def) {\n      if (def.createType == null ||\n        def.initType == null ||\n        def.class == null\n      ) {\n        throw new Error('Custom type was not initialized correctly!')\n      }\n      this.createType = def.createType\n      this.initType = def.initType\n      this.class = def.class\n    }\n  }\n  Y.utils.CustomType = CustomType\n\n  /*\n    Make a flat copy of an object\n    (just copy properties)\n  */\n  function copyObject (o) {\n    var c = {}\n    for (var key in o) {\n      c[key] = o[key]\n    }\n    return c\n  }\n  Y.utils.copyObject = copyObject\n\n  /*\n    Defines a smaller relation on Id's\n  */\n  function smaller (a, b) {\n    return a[0] < b[0] || (a[0] === b[0] && a[1] < b[1])\n  }\n  Y.utils.smaller = smaller\n\n  function compareIds (id1, id2) {\n    if (id1 == null || id2 == null) {\n      if (id1 == null && id2 == null) {\n        return true\n      }\n      return false\n    }\n    if (id1[0] === id2[0] && id1[1] === id2[1]) {\n      return true\n    } else {\n      return false\n    }\n  }\n  Y.utils.compareIds = compareIds\n}\n","/* @flow */\n'use strict'\n\nrequire('./Connector.js')(Y)\nrequire('./Database.js')(Y)\nrequire('./Transaction.js')(Y)\nrequire('./Struct.js')(Y)\nrequire('./Utils.js')(Y)\nrequire('./Connectors/Test.js')(Y)\n\nvar requiringModules = {}\n\nmodule.exports = Y\n\nY.extend = function (name, value) {\n  Y[name] = value\n  if (requiringModules[name] != null) {\n    requiringModules[name].resolve()\n    delete requiringModules[name]\n  }\n}\n\nY.requestModules = function (modules) {\n  var promises = []\n  for (var i = 0; i < modules.length; i++) {\n    var modulename = 'y-' + modules[i].toLowerCase()\n    if (Y[modules[i]] == null) {\n      if (requiringModules[modules[i]] == null) {\n        try {\n          require(modulename)(Y)\n        } catch (e) {\n          // module does not exist\n          if (typeof window !== 'undefined') {\n            var imported = document.createElement('script')\n            imported.src = Y.sourceDir + '/' + modulename + '/' + modulename + '.js'\n            document.head.appendChild(imported)\n            ;(function () {\n              var modname = modules[i]\n              var promise = new Promise(function (resolve) {\n                requiringModules[modname] = {\n                  resolve: resolve,\n                  promise: promise\n                }\n              })\n              promises.push(promise)\n            })()\n          } else {\n            throw e\n          }\n        }\n      } else {\n        promises.push(requiringModules[modules[i]].promise)\n      }\n    }\n  }\n  return Promise.all(promises)\n}\n\nrequire('./Types/Map.js')(Y)\n\nfunction Y (opts) {\n  opts.types = opts.types != null ? opts.types : []\n  var modules = [opts.db.name, opts.connector.name].concat(opts.types)\n  Y.sourceDir = opts.sourceDir\n  return Y.requestModules(modules).then(function () {\n    return new Promise(function (resolve) {\n      var yconfig = new YConfig(opts, function () {\n        yconfig.db.whenUserIdSet(function () {\n          resolve(yconfig)\n        })\n      })\n    })\n  })\n}\n\nclass YConfig {\n  constructor (opts, callback) {\n    this.db = new Y[opts.db.name](this, opts.db)\n    this.connector = new Y[opts.connector.name](this, opts.connector)\n    this.db.requestTransaction(function * requestTransaction () {\n      // create initial Map type\n      var model = {\n        id: ['_', 0],\n        struct: 'Map',\n        type: 'Map',\n        map: {}\n      }\n      yield* this.store.tryExecute.call(this, model)\n      var root = yield* this.getType(model.id)\n      this.store.y.root = root\n      callback()\n    })\n  }\n  isConnected () {\n    return this.connector.isSynced\n  }\n  disconnect () {\n    return this.connector.disconnect()\n  }\n  reconnect () {\n    return this.connector.reconnect()\n  }\n  destroy () {\n    this.disconnect()\n    this.db.destroy()\n    this.connector = null\n    this.db = null\n  }\n}\n\nif (typeof window !== 'undefined') {\n  window.Y = Y\n}\n"]}
\ No newline at end of file