From 3142b0f1610397759236a00785a1738cd79da959 Mon Sep 17 00:00:00 2001
From: Kevin Jahns <kevin.jahns@rwth-aachen.de>
Date: Sun, 21 Jun 2015 14:55:39 +0200
Subject: [PATCH] added some Operations, a connector, more structure. In
particular I put a lot of time into the event handling
---
src/Connectors.js | 446 +++++++++++++++++++++++++++++++
src/OperationStore.js | 46 ++++
src/OperationStores/IndexedDB.js | 2 +-
src/Operations.js | 116 +++++++-
src/Types.js | 25 ++
src/y.js | 5 +
y.js | 2 +-
y.js.map | 2 +-
8 files changed, 634 insertions(+), 10 deletions(-)
create mode 100644 src/Connectors.js
create mode 100644 src/Types.js
diff --git a/src/Connectors.js b/src/Connectors.js
new file mode 100644
index 00000000..96b9905d
--- /dev/null
+++ b/src/Connectors.js
@@ -0,0 +1,446 @@
+
+
+(function(){
+ function WebRTC(webrtc_options){
+ if(webrtc_options === undefined){
+ throw new Error("webrtc_options must not be undefined!")
+ }
+ var room = webrtc_options.room;
+
+ // connect per default to our server
+ if(webrtc_options.url === undefined){
+ webrtc_options.url = "https://yatta.ninja:8888";
+ }
+
+ var swr = new SimpleWebRTC(webrtc_options);
+ this.swr = swr;
+ var self = this;
+
+ var channel;
+
+ swr.once('connectionReady',function(user_id){
+ // SimpleWebRTC (swr) is initialized
+ swr.joinRoom(room);
+
+ swr.once('joinedRoom', function(){
+ // the client joined the specified room
+
+ // initialize the connector with the required parameters.
+ // You always should specify `role`, `syncMethod`, and `user_id`
+ self.init({
+ role : "slave",
+ syncMethod : "syncAll",
+ user_id : user_id
+ });
+ var i;
+ // notify the connector class about all the users that already
+ // joined the session
+ for(i in self.swr.webrtc.peers){
+ self.userJoined(self.swr.webrtc.peers[i].id, "slave");
+ }
+
+
+ swr.on("channelMessage", function(peer, room, message){
+ // The client received a message
+ // Check if the connector is already initialized,
+ // only then forward the message to the connector class
+ if(self.is_initialized && message.type === "yjs"){
+ self.receiveMessage(peer.id, message.payload);
+ }
+ });
+ });
+
+ swr.on("createdPeer", function(peer){
+ // a new peer/client joined the session.
+ // Notify the connector class, if the connector
+ // is already initialized
+ if(self.is_initialized){
+ // note: Since the WebRTC Connector only supports the SyncAll
+ // syncmethod, every client is a slave.
+ self.userJoined(peer.id, "slave");
+ }
+ });
+
+ swr.on("peerStreamRemoved",function(peer){
+ // a client left the session.
+ // Notify the connector class, if the connector
+ // is already initialized
+ if(self.is_initialized){
+ self.userLeft(peer.id);
+ }
+ });
+ });
+ }
+
+ // Specify how to send a message to a specific user (by uid)
+ WebRTC.prototype.send = function(uid, message){
+ var self = this;
+ // we have to make sure that the message is sent under all circumstances
+ var send = function(){
+ // check if the clients still exists
+ var peer = self.swr.webrtc.getPeers(uid)[0];
+ var success;
+ if(peer){
+ // success is true, if the message is successfully sent
+ success = peer.sendDirectly("simplewebrtc", "yjs", message);
+ }
+ if(!success){
+ // resend the message if it didn't work
+ window.setTimeout(send,500);
+ }
+ };
+ // try to send the message
+ send();
+ };
+
+ // specify how to broadcast a message to all users
+ // (it may send the message back to itself).
+ // The webrtc connecor tries to send it to every single clients directly
+ WebRTC.prototype.broadcast = function(message){
+ this.swr.sendDirectlyToAll("simplewebrtc","yjs",message);
+ };
+
+ Y.Connectors.WebRTC = WebRTC;
+})()
+
+
+var connectorAdapter = (){
+ #
+ # @params new Connector(options)
+ # @param options.syncMethod {String} is either "syncAll" or "master-slave".
+ # @param options.role {String} The role of this client
+ # (slave or master (only used when syncMethod is master-slave))
+ # @param options.perform_send_again {Boolean} Whetehr to whether to resend the HB after some time period. This reduces sync errors, but has some overhead (optional)
+ #
+ init: (options)->
+ req = (name, choices)=>
+ if options[name]?
+ if (not choices?) or choices.some((c)->c is options[name])
+ @[name] = options[name]
+ else
+ throw new Error "You can set the '"+name+"' option to one of the following choices: "+JSON.encode(choices)
+ else
+ throw new Error "You must specify "+name+", when initializing the Connector!"
+
+ req "syncMethod", ["syncAll", "master-slave"]
+ req "role", ["master", "slave"]
+ req "user_id"
+ @on_user_id_set?(@user_id)
+
+ # whether to resend the HB after some time period. This reduces sync errors.
+ # But this is not necessary in the test-connector
+ if options.perform_send_again?
+ @perform_send_again = options.perform_send_again
+ else
+ @perform_send_again = true
+
+ # A Master should sync with everyone! TODO: really? - for now its safer this way!
+ if @role is "master"
+ @syncMethod = "syncAll"
+
+ # is set to true when this is synced with all other connections
+ @is_synced = false
+ # Peerjs Connections: key: conn-id, value: object
+ @connections = {}
+ # List of functions that shall process incoming data
+ @receive_handlers ?= []
+
+ # whether this instance is bound to any y instance
+ @connections = {}
+ @current_sync_target = null
+ @sent_hb_to_all_users = false
+ @is_initialized = true
+
+ onUserEvent: (f)->
+ @connections_listeners ?= []
+ @connections_listeners.push f
+
+ isRoleMaster: ->
+ @role is "master"
+
+ isRoleSlave: ->
+ @role is "slave"
+
+ findNewSyncTarget: ()->
+ @current_sync_target = null
+ if @syncMethod is "syncAll"
+ for user, c of @connections
+ if not c.is_synced
+ @performSync user
+ break
+ if not @current_sync_target?
+ @setStateSynced()
+ null
+
+ userLeft: (user)->
+ delete @connections[user]
+ @findNewSyncTarget()
+ if @connections_listeners?
+ for f in @connections_listeners
+ f {
+ action: "userLeft"
+ user: user
+ }
+
+
+ userJoined: (user, role)->
+ if not role?
+ throw new Error "Internal: You must specify the role of the joined user! E.g. userJoined('uid:3939','slave')"
+ # a user joined the room
+ @connections[user] ?= {}
+ @connections[user].is_synced = false
+
+ if (not @is_synced) or @syncMethod is "syncAll"
+ if @syncMethod is "syncAll"
+ @performSync user
+ else if role is "master"
+ # TODO: What if there are two masters? Prevent sending everything two times!
+ @performSyncWithMaster user
+
+ if @connections_listeners?
+ for f in @connections_listeners
+ f {
+ action: "userJoined"
+ user: user
+ role: role
+ }
+
+ #
+ # Execute a function _when_ we are connected. If not connected, wait until connected.
+ # @param f {Function} Will be executed on the Connector context.
+ #
+ whenSynced: (args)->
+ if args.constructor is Function
+ args = [args]
+ if @is_synced
+ args[0].apply this, args[1..]
+ else
+ @compute_when_synced ?= []
+ @compute_when_synced.push args
+
+ #
+ # Execute an function when a message is received.
+ # @param f {Function} Will be executed on the PeerJs-Connector context. f will be called with (sender_id, broadcast {true|false}, message).
+ #
+ onReceive: (f)->
+ @receive_handlers.push f
+
+ #
+ # perform a sync with a specific user.
+ #
+ performSync: (user)->
+ if not @current_sync_target?
+ @current_sync_target = user
+ @send user,
+ sync_step: "getHB"
+ send_again: "true"
+ data: @getStateVector()
+ if not @sent_hb_to_all_users
+ @sent_hb_to_all_users = true
+
+ hb = @getHB([]).hb
+ _hb = []
+ for o in hb
+ _hb.push o
+ if _hb.length > 10
+ @broadcast
+ sync_step: "applyHB_"
+ data: _hb
+ _hb = []
+ @broadcast
+ sync_step: "applyHB"
+ data: _hb
+
+ #
+ # When a master node joined the room, perform this sync with him. It will ask the master for the HB,
+ # and will broadcast his own HB
+ #
+ performSyncWithMaster: (user)->
+ @current_sync_target = user
+ @send user,
+ sync_step: "getHB"
+ send_again: "true"
+ data: @getStateVector()
+ hb = @getHB([]).hb
+ _hb = []
+ for o in hb
+ _hb.push o
+ if _hb.length > 10
+ @broadcast
+ sync_step: "applyHB_"
+ data: _hb
+ _hb = []
+ @broadcast
+ sync_step: "applyHB"
+ data: _hb
+
+ #
+ # You are sure that all clients are synced, call this function.
+ #
+ setStateSynced: ()->
+ if not @is_synced
+ @is_synced = true
+ if @compute_when_synced?
+ for el in @compute_when_synced
+ f = el[0]
+ args = el[1..]
+ f.apply(args)
+ delete @compute_when_synced
+ null
+
+ # executed when the a state_vector is received. listener will be called only once!
+ whenReceivedStateVector: (f)->
+ @when_received_state_vector_listeners ?= []
+ @when_received_state_vector_listeners.push f
+
+
+ #
+ # You received a raw message, and you know that it is intended for to Yjs. Then call this function.
+ #
+ receiveMessage: (sender, res)->
+ if not res.sync_step?
+ for f in @receive_handlers
+ f sender, res
+ else
+ if sender is @user_id
+ return
+ if res.sync_step is "getHB"
+ # call listeners
+ if @when_received_state_vector_listeners?
+ for f in @when_received_state_vector_listeners
+ f.call this, res.data
+ delete @when_received_state_vector_listeners
+
+ data = @getHB(res.data)
+ hb = data.hb
+ _hb = []
+ # always broadcast, when not synced.
+ # This reduces errors, when the clients goes offline prematurely.
+ # When this client only syncs to one other clients, but looses connectors,
+ # before syncing to the other clients, the online clients have different states.
+ # Since we do not want to perform regular syncs, this is a good alternative
+ if @is_synced
+ sendApplyHB = (m)=>
+ @send sender, m
+ else
+ sendApplyHB = (m)=>
+ @broadcast m
+
+ for o in hb
+ _hb.push o
+ if _hb.length > 10
+ sendApplyHB
+ sync_step: "applyHB_"
+ data: _hb
+ _hb = []
+
+ sendApplyHB
+ sync_step : "applyHB"
+ data: _hb
+
+ if res.send_again? and @perform_send_again
+ send_again = do (sv = data.state_vector)=>
+ ()=>
+ hb = @getHB(sv).hb
+ for o in hb
+ _hb.push o
+ if _hb.length > 10
+ @send sender,
+ sync_step: "applyHB_"
+ data: _hb
+ _hb = []
+ @send sender,
+ sync_step: "applyHB",
+ data: _hb
+ sent_again: "true"
+ setTimeout send_again, 3000
+ else if res.sync_step is "applyHB"
+ @applyHB(res.data, sender is @current_sync_target)
+
+ if (@syncMethod is "syncAll" or res.sent_again?) and (not @is_synced) and ((@current_sync_target is sender) or (not @current_sync_target?))
+ @connections[sender].is_synced = true
+ @findNewSyncTarget()
+
+ else if res.sync_step is "applyHB_"
+ @applyHB(res.data, sender is @current_sync_target)
+
+
+ # 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)->
+ parse_array = (node)->
+ for n in node.children
+ if n.getAttribute("isArray") is "true"
+ parse_array n
+ else
+ parse_object n
+
+ parse_object = (node)->
+ json = {}
+ for name, value of node.attrs
+ int = parseInt(value)
+ if isNaN(int) or (""+int) isnt value
+ json[name] = value
+ else
+ json[name] = int
+ for n in node.children
+ name = n.name
+ if n.getAttribute("isArray") is "true"
+ json[name] = parse_array n
+ else
+ json[name] = parse_object n
+ json
+ parse_object 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 - guess it ;)
+ #
+ encodeMessageToXml: (m, json)->
+ # attributes is optional
+ encode_object = (m, json)->
+ for name,value of json
+ if not value?
+ # nop
+ else if value.constructor is Object
+ encode_object m.c(name), value
+ else if value.constructor is Array
+ encode_array m.c(name), value
+ else
+ m.setAttribute(name,value)
+ m
+ encode_array = (m, array)->
+ m.setAttribute("isArray","true")
+ for e in array
+ if e.constructor is Object
+ encode_object m.c("array-element"), e
+ else
+ encode_array m.c("array-element"), e
+ m
+ if json.constructor is Object
+ encode_object m.c("y",{xmlns:"http://y.ninja/connector-stanza"}), json
+ else if json.constructor is Array
+ encode_array m.c("y",{xmlns:"http://y.ninja/connector-stanza"}), json
+ else
+ throw new Error "I can't encode this json!"
+
+ setIsBoundToY: ()->
+ @on_bound_to_y?()
+ delete @when_bound_to_y
+ @is_bound_to_y = true
+ }
+};
diff --git a/src/OperationStore.js b/src/OperationStore.js
index 7d77f1a3..072947cb 100644
--- a/src/OperationStore.js
+++ b/src/OperationStore.js
@@ -26,6 +26,9 @@ type Id = [string, number];
class AbstractOperationStore { //eslint-disable-line no-unused-vars
constructor () {
+ this.parentListeners = {};
+ this.parentListenersRequestPending = false;
+ this.parentListenersActivated = {};
// E.g. this.listenersById[id] : Array<Listener>
this.listenersById = {};
// Execute the next time a transaction is requested
@@ -106,6 +109,7 @@ class AbstractOperationStore { //eslint-disable-line no-unused-vars
}
// called by a transaction when an operation is added
operationAdded (op) {
+ // notify whenOperation listeners (by id)
var l = this.listenersById[op.id];
if (l != null) {
for (var listener of l){
@@ -114,5 +118,47 @@ class AbstractOperationStore { //eslint-disable-line no-unused-vars
}
}
}
+ // notify parent listeners, if possible
+ var listeners = this.parentListeners[op.parent];
+ if ( this.parentListenersRequestPending
+ || ( listeners == null )
+ || ( listeners.length === 0 )) {
+ return;
+ }
+ var al = this.parentListenersActivated[JSON.stringify(op.parent)];
+ if ( al == null ){
+ al = [];
+ this.parentListenersActivated[JSON.stringify(op.parent)] = al;
+ }
+ al.push(op);
+
+ this.parentListenersRequestPending = true;
+ var store = this;
+ this.requestTransaction(function*(myRequest){ // you can throw error on myRequest, then restart if you have to
+ store.parentListenersRequestPending = false;
+ var activatedOperations = store.parentListenersActivated;
+ store.parentListenersActivated = {};
+ for (var parent_id in activatedOperations){
+ var parent = yield* this.getOperation(parent_id);
+ Struct[parent.type].notifyObservers(activatedOperations[parent_id]);
+ }
+ })
+
+ }
+ removeParentListener (id, f) {
+ var ls = this.parentListeners[id];
+ if (ls != null) {
+ this.parentListeners[id] = ls.filter(function(g){
+ return (f !== g);
+ });
+ }
+ }
+ addParentListener (id, f) {
+ var ls = this.parentListeners[JSON.stringify(id)];
+ if (ls == null) {
+ ls = [];
+ this.parentListeners[JSON.stringify(id)] = ls;
+ }
+ ls.push(f);
}
}
diff --git a/src/OperationStores/IndexedDB.js b/src/OperationStores/IndexedDB.js
index 706dcced..fd3f4d87 100644
--- a/src/OperationStores/IndexedDB.js
+++ b/src/OperationStores/IndexedDB.js
@@ -128,7 +128,7 @@ var IndexedDB = (function(){ //eslint-disable-line no-unused-vars
var request = yield transactionQueue;
transaction = new Transaction(store);
- yield* request.call(transaction);/*
+ yield* request.call(transaction, request);/*
while (transactionQueue.queue.length > 0) {
yield* transactionQueue.queue.shift().call(transaction);
}*/
diff --git a/src/Operations.js b/src/Operations.js
index 8934df5a..6205e46f 100644
--- a/src/Operations.js
+++ b/src/Operations.js
@@ -1,7 +1,7 @@
/* @flow */
// Op is anything that we could get from the OperationStore.
-type Op = Object;
+struct Op = Object;
var Struct = {
Operation: { //eslint-disable-line no-unused-vars
@@ -14,13 +14,15 @@ var Struct = {
Insert: {
create: function*( op : Op,
user : string,
+ content : any,
left : Struct.Insert,
- right : Struct.Insert) : Struct.Insert {
+ right : Struct.Insert,
+ parent : Struct.List) : Struct.Insert {
op.left = left ? left.id : null;
op.origin = op.left;
op.right = right ? right.id : null;
- op.type = "Insert";
- yield* Struct.Operation.create(op, user);
+ op.struct = "Insert";
+ yield* Struct.Operation.create.call(this, op, user);
if (left != null) {
left.right = op.id;
@@ -33,12 +35,112 @@ var Struct = {
return op;
},
requiredOps: function(op, ids){
- ids.push(op.left);
- ids.push(op.right);
+ if(op.left != null){
+ ids.push(op.left);
+ }
+ if(op.right != null){
+ ids.push(op.right);
+ }
return ids;
},
+ getDistanceToOrigin: function *(op){
+ var d = 0;
+ var o = yield this.getOperation(op.left);
+ while (op.origin !== (o ? o.id : null)) {
+ d++;
+ 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){
- return op;
+ var distance_to_origin = yield* Struct.Insert.getDistanceToOrigin(op); // most cases: 0 (starts from 0)
+ var i = distance_to_origin; // loop counter
+ var o = yield* this.getOperation(this.left);
+ o = yield* this.getOperation(o.right);
+ var tmp;
+ while (true) {
+ if (o.id !== this.right){
+ if (Struct.Insert.getDistanceToOrigin(o) === i) {
+ // case 1
+ if (o.id[0] < op.id[0]) {
+ op.left = o;
+ distance_to_origin = i + 1;
+ }
+ } else if ((tmp = Struct.Insert.getDistanceToOrigin(o)) < i) {
+ // case 2
+ if (i - distance_to_origin <= tmp) {
+ op.left = o;
+ distance_to_origin = i+1;
+ }
+ } else {
+ break;
+ }
+ i++;
+ o = yield* this.getOperation(o.next_cl);
+ } else {
+ break
+ }
+ }
+ // reconnect..
+ var left = this.getOperation(op.left);
+ var right = this.getOperation(op.right);
+ left.right = op.id;
+ right.left = op.id;
+ op.left = left;
+ op.right = right;
+ yield* this.setOperation(left);
+ yield* this.setOperation(right);
+ yield* this.setOperation(op);
+ }
+ },
+ List: {
+ create: function*( op : Op,
+ user : string){
+ op.start = null;
+ op.end = null;
+ op.struct = "List";
+ return yield* Struct.Operation.create.call(this, op, user);
+ },
+ requiredOps: function(op, ids){
+ if (op.start != null) {
+ ids.push(op.start);
+ }
+ if (op.end != null){
+ ids.push(op.end);
+ }
+ return ids;
+ },
+ execute: function* (op) {
+ // nop
+ }
+ ref: function* (op, pos) : Struct.Insert | undefined{
+ var o = op.start;
+ while ( pos !== 0 || o == null) {
+ o = (yield* this.getOperation(op.start)).right;
+ }
+ return (o == null) ? null : yield* this.getOperation(o);
+ }
+ insert: function* (op, pos : number, contents : Array<any>) {
+ var o = yield* Struct.List.ref.call(this, op, pos);
+ var o_end = yield* this.getOperation(o.right);
+ for (var content of contents) {
+ o = yield* Struct.Insert.create.call(this, {}, user, content, o, o_end, op);
+ }
}
}
};
diff --git a/src/Types.js b/src/Types.js
new file mode 100644
index 00000000..e42d10b3
--- /dev/null
+++ b/src/Types.js
@@ -0,0 +1,25 @@
+
+
+(function(){
+
+ class List {
+ constructor (_model) {
+ this._model = _model;
+ }
+ *val (pos) {
+ var o = yield* this.Struct.List.ref(pos);
+ return o ? o.content : null;
+ }
+ *insert (pos, contents) {
+ yield* this.Struct.List.insert(pos, contents);
+ }
+ }
+
+ Y.List = function* YList(){
+ var model = yield* this.Struct.List.create();
+ return new Y.List.Create(model);
+ }
+
+ Y.List.Create = List;
+ Y.List = List;
+})();
diff --git a/src/y.js b/src/y.js
index e667c471..723865ee 100644
--- a/src/y.js
+++ b/src/y.js
@@ -1 +1,6 @@
/* @flow */
+
+function Y (opts) {
+ var connector = opts.connector;
+ Y.Connectors[connector.name]
+}
diff --git a/y.js b/y.js
index a471e1ad..86c64885 100644
--- a/y.js
+++ b/y.js
@@ -1,2 +1,2 @@
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* Copyright (c) 2014, Facebook, Inc.\n * All rights reserved.\n *\n * This source code is licensed under the BSD-style license found in the\n * https://raw.github.com/facebook/regenerator/master/LICENSE file. An\n * additional grant of patent rights can be found in the PATENTS file in\n * the same directory.\n */\n\n!(function(global) {\n \"use strict\";\n\n var hasOwn = Object.prototype.hasOwnProperty;\n var undefined; // More compressible than void 0.\n var iteratorSymbol =\n typeof Symbol === \"function\" && Symbol.iterator || \"@@iterator\";\n\n var inModule = typeof module === \"object\";\n var runtime = global.regeneratorRuntime;\n if (runtime) {\n if (inModule) {\n // If regeneratorRuntime is defined globally and we're in a module,\n // make the exports object identical to regeneratorRuntime.\n module.exports = runtime;\n }\n // Don't bother evaluating the rest of this file if the runtime was\n // already defined globally.\n return;\n }\n\n // Define the runtime globally (as expected by generated code) as either\n // module.exports (if we're in a module) or a new, empty object.\n runtime = global.regeneratorRuntime = inModule ? module.exports : {};\n\n function wrap(innerFn, outerFn, self, tryLocsList) {\n // If outerFn provided, then outerFn.prototype instanceof Generator.\n var generator = Object.create((outerFn || Generator).prototype);\n\n generator._invoke = makeInvokeMethod(\n innerFn, self || null,\n new Context(tryLocsList || [])\n );\n\n return generator;\n }\n runtime.wrap = wrap;\n\n // Try/catch helper to minimize deoptimizations. Returns a completion\n // record like context.tryEntries[i].completion. This interface could\n // have been (and was previously) designed to take a closure to be\n // invoked without arguments, but in all the cases we care about we\n // already have an existing method we want to call, so there's no need\n // to create a new function object. We can even get away with assuming\n // the method takes exactly one argument, since that happens to be true\n // in every case, so we don't have to touch the arguments object. The\n // only additional allocation required is the completion record, which\n // has a stable shape and so hopefully should be cheap to allocate.\n function tryCatch(fn, obj, arg) {\n try {\n return { type: \"normal\", arg: fn.call(obj, arg) };\n } catch (err) {\n return { type: \"throw\", arg: err };\n }\n }\n\n var GenStateSuspendedStart = \"suspendedStart\";\n var GenStateSuspendedYield = \"suspendedYield\";\n var GenStateExecuting = \"executing\";\n var GenStateCompleted = \"completed\";\n\n // Returning this object from the innerFn has the same effect as\n // breaking out of the dispatch switch statement.\n var ContinueSentinel = {};\n\n // Dummy constructor functions that we use as the .constructor and\n // .constructor.prototype properties for functions that return Generator\n // objects. For full spec compliance, you may wish to configure your\n // minifier not to mangle the names of these two functions.\n function Generator() {}\n function GeneratorFunction() {}\n function GeneratorFunctionPrototype() {}\n\n var Gp = GeneratorFunctionPrototype.prototype = Generator.prototype;\n GeneratorFunction.prototype = Gp.constructor = GeneratorFunctionPrototype;\n GeneratorFunctionPrototype.constructor = GeneratorFunction;\n GeneratorFunction.displayName = \"GeneratorFunction\";\n\n // Helper for defining the .next, .throw, and .return methods of the\n // Iterator interface in terms of a single ._invoke method.\n function defineIteratorMethods(prototype) {\n [\"next\", \"throw\", \"return\"].forEach(function(method) {\n prototype[method] = function(arg) {\n return this._invoke(method, arg);\n };\n });\n }\n\n runtime.isGeneratorFunction = function(genFun) {\n var ctor = typeof genFun === \"function\" && genFun.constructor;\n return ctor\n ? ctor === GeneratorFunction ||\n // For the native GeneratorFunction constructor, the best we can\n // do is to check its .name property.\n (ctor.displayName || ctor.name) === \"GeneratorFunction\"\n : false;\n };\n\n runtime.mark = function(genFun) {\n genFun.__proto__ = GeneratorFunctionPrototype;\n genFun.prototype = Object.create(Gp);\n return genFun;\n };\n\n // Within the body of any async function, `await x` is transformed to\n // `yield regeneratorRuntime.awrap(x)`, so that the runtime can test\n // `value instanceof AwaitArgument` to determine if the yielded value is\n // meant to be awaited. Some may consider the name of this method too\n // cutesy, but they are curmudgeons.\n runtime.awrap = function(arg) {\n return new AwaitArgument(arg);\n };\n\n function AwaitArgument(arg) {\n this.arg = arg;\n }\n\n function AsyncIterator(generator) {\n // This invoke function is written in a style that assumes some\n // calling function (or Promise) will handle exceptions.\n function invoke(method, arg) {\n var result = generator[method](arg);\n var value = result.value;\n return value instanceof AwaitArgument\n ? Promise.resolve(value.arg).then(invokeNext, invokeThrow)\n : Promise.resolve(value).then(function(unwrapped) {\n result.value = unwrapped;\n return result;\n }, invokeThrow);\n }\n\n if (typeof process === \"object\" && process.domain) {\n invoke = process.domain.bind(invoke);\n }\n\n var invokeNext = invoke.bind(generator, \"next\");\n var invokeThrow = invoke.bind(generator, \"throw\");\n var invokeReturn = invoke.bind(generator, \"return\");\n var previousPromise;\n\n function enqueue(method, arg) {\n var enqueueResult =\n // If enqueue has been called before, then we want to wait until\n // all previous Promises have been resolved before calling invoke,\n // so that results are always delivered in the correct order. If\n // enqueue has not been called before, then it is important to\n // call invoke immediately, without waiting on a callback to fire,\n // so that the async generator function has the opportunity to do\n // any necessary setup in a predictable way. This predictability\n // is why the Promise constructor synchronously invokes its\n // executor callback, and why async functions synchronously\n // execute code before the first await. Since we implement simple\n // async functions in terms of async generators, it is especially\n // important to get this right, even though it requires care.\n previousPromise ? previousPromise.then(function() {\n return invoke(method, arg);\n }) : new Promise(function(resolve) {\n resolve(invoke(method, arg));\n });\n\n // Avoid propagating enqueueResult failures to Promises returned by\n // later invocations of the iterator, and call generator.return() to\n // allow the generator a chance to clean up.\n previousPromise = enqueueResult[\"catch\"](invokeReturn);\n\n return enqueueResult;\n }\n\n // Define the unified helper method that is used to implement .next,\n // .throw, and .return (see defineIteratorMethods).\n this._invoke = enqueue;\n }\n\n defineIteratorMethods(AsyncIterator.prototype);\n\n // Note that simple async functions are implemented on top of\n // AsyncIterator objects; they just return a Promise for the value of\n // the final result produced by the iterator.\n runtime.async = function(innerFn, outerFn, self, tryLocsList) {\n var iter = new AsyncIterator(\n wrap(innerFn, outerFn, self, tryLocsList)\n );\n\n return runtime.isGeneratorFunction(outerFn)\n ? iter // If outerFn is a generator, return the full iterator.\n : iter.next().then(function(result) {\n return result.done ? result.value : iter.next();\n });\n };\n\n function makeInvokeMethod(innerFn, self, context) {\n var state = GenStateSuspendedStart;\n\n return function invoke(method, arg) {\n if (state === GenStateExecuting) {\n throw new Error(\"Generator is already running\");\n }\n\n if (state === GenStateCompleted) {\n // Be forgiving, per 25.3.3.3.3 of the spec:\n // https://people.mozilla.org/~jorendorff/es6-draft.html#sec-generatorresume\n return doneResult();\n }\n\n while (true) {\n var delegate = context.delegate;\n if (delegate) {\n if (method === \"return\" ||\n (method === \"throw\" && delegate.iterator[method] === undefined)) {\n // A return or throw (when the delegate iterator has no throw\n // method) always terminates the yield* loop.\n context.delegate = null;\n\n // If the delegate iterator has a return method, give it a\n // chance to clean up.\n var returnMethod = delegate.iterator[\"return\"];\n if (returnMethod) {\n var record = tryCatch(returnMethod, delegate.iterator, arg);\n if (record.type === \"throw\") {\n // If the return method threw an exception, let that\n // exception prevail over the original return or throw.\n method = \"throw\";\n arg = record.arg;\n continue;\n }\n }\n\n if (method === \"return\") {\n // Continue with the outer return, now that the delegate\n // iterator has been terminated.\n continue;\n }\n }\n\n var record = tryCatch(\n delegate.iterator[method],\n delegate.iterator,\n arg\n );\n\n if (record.type === \"throw\") {\n context.delegate = null;\n\n // Like returning generator.throw(uncaught), but without the\n // overhead of an extra function call.\n method = \"throw\";\n arg = record.arg;\n continue;\n }\n\n // Delegate generator ran and handled its own exceptions so\n // regardless of what the method was, we continue as if it is\n // \"next\" with an undefined arg.\n method = \"next\";\n arg = undefined;\n\n var info = record.arg;\n if (info.done) {\n context[delegate.resultName] = info.value;\n context.next = delegate.nextLoc;\n } else {\n state = GenStateSuspendedYield;\n return info;\n }\n\n context.delegate = null;\n }\n\n if (method === \"next\") {\n if (state === GenStateSuspendedYield) {\n context.sent = arg;\n } else {\n delete context.sent;\n }\n\n } else if (method === \"throw\") {\n if (state === GenStateSuspendedStart) {\n state = GenStateCompleted;\n throw arg;\n }\n\n if (context.dispatchException(arg)) {\n // If the dispatched exception was caught by a catch block,\n // then let that catch block handle the exception normally.\n method = \"next\";\n arg = undefined;\n }\n\n } else if (method === \"return\") {\n context.abrupt(\"return\", arg);\n }\n\n state = GenStateExecuting;\n\n var record = tryCatch(innerFn, self, context);\n if (record.type === \"normal\") {\n // If an exception is thrown from innerFn, we leave state ===\n // GenStateExecuting and loop back for another invocation.\n state = context.done\n ? GenStateCompleted\n : GenStateSuspendedYield;\n\n var info = {\n value: record.arg,\n done: context.done\n };\n\n if (record.arg === ContinueSentinel) {\n if (context.delegate && method === \"next\") {\n // Deliberately forget the last sent value so that we don't\n // accidentally pass it on to the delegate.\n arg = undefined;\n }\n } else {\n return info;\n }\n\n } else if (record.type === \"throw\") {\n state = GenStateCompleted;\n // Dispatch the exception by looping back around to the\n // context.dispatchException(arg) call above.\n method = \"throw\";\n arg = record.arg;\n }\n }\n };\n }\n\n // Define Generator.prototype.{next,throw,return} in terms of the\n // unified ._invoke helper method.\n defineIteratorMethods(Gp);\n\n Gp[iteratorSymbol] = function() {\n return this;\n };\n\n Gp.toString = function() {\n return \"[object Generator]\";\n };\n\n function pushTryEntry(locs) {\n var entry = { tryLoc: locs[0] };\n\n if (1 in locs) {\n entry.catchLoc = locs[1];\n }\n\n if (2 in locs) {\n entry.finallyLoc = locs[2];\n entry.afterLoc = locs[3];\n }\n\n this.tryEntries.push(entry);\n }\n\n function resetTryEntry(entry) {\n var record = entry.completion || {};\n record.type = \"normal\";\n delete record.arg;\n entry.completion = record;\n }\n\n function Context(tryLocsList) {\n // The root entry object (effectively a try statement without a catch\n // or a finally block) gives us a place to store values thrown from\n // locations where there is no enclosing try statement.\n this.tryEntries = [{ tryLoc: \"root\" }];\n tryLocsList.forEach(pushTryEntry, this);\n this.reset();\n }\n\n runtime.keys = function(object) {\n var keys = [];\n for (var key in object) {\n keys.push(key);\n }\n keys.reverse();\n\n // Rather than returning an object with a next method, we keep\n // things simple and return the next function itself.\n return function next() {\n while (keys.length) {\n var key = keys.pop();\n if (key in object) {\n next.value = key;\n next.done = false;\n return next;\n }\n }\n\n // To avoid creating an additional object, we just hang the .value\n // and .done properties off the next function object itself. This\n // also ensures that the minifier will not anonymize the function.\n next.done = true;\n return next;\n };\n };\n\n function values(iterable) {\n if (iterable) {\n var iteratorMethod = iterable[iteratorSymbol];\n if (iteratorMethod) {\n return iteratorMethod.call(iterable);\n }\n\n if (typeof iterable.next === \"function\") {\n return iterable;\n }\n\n if (!isNaN(iterable.length)) {\n var i = -1, next = function next() {\n while (++i < iterable.length) {\n if (hasOwn.call(iterable, i)) {\n next.value = iterable[i];\n next.done = false;\n return next;\n }\n }\n\n next.value = undefined;\n next.done = true;\n\n return next;\n };\n\n return next.next = next;\n }\n }\n\n // Return an iterator with no values.\n return { next: doneResult };\n }\n runtime.values = values;\n\n function doneResult() {\n return { value: undefined, done: true };\n }\n\n Context.prototype = {\n constructor: Context,\n\n reset: function() {\n this.prev = 0;\n this.next = 0;\n this.sent = undefined;\n this.done = false;\n this.delegate = null;\n\n this.tryEntries.forEach(resetTryEntry);\n\n // Pre-initialize at least 20 temporary variables to enable hidden\n // class optimizations for simple generators.\n for (var tempIndex = 0, tempName;\n hasOwn.call(this, tempName = \"t\" + tempIndex) || tempIndex < 20;\n ++tempIndex) {\n this[tempName] = null;\n }\n },\n\n stop: function() {\n this.done = true;\n\n var rootEntry = this.tryEntries[0];\n var rootRecord = rootEntry.completion;\n if (rootRecord.type === \"throw\") {\n throw rootRecord.arg;\n }\n\n return this.rval;\n },\n\n dispatchException: function(exception) {\n if (this.done) {\n throw exception;\n }\n\n var context = this;\n function handle(loc, caught) {\n record.type = \"throw\";\n record.arg = exception;\n context.next = loc;\n return !!caught;\n }\n\n for (var i = this.tryEntries.length - 1; i >= 0; --i) {\n var entry = this.tryEntries[i];\n var record = entry.completion;\n\n if (entry.tryLoc === \"root\") {\n // Exception thrown outside of any try block that could handle\n // it, so set the completion value of the entire function to\n // throw the exception.\n return handle(\"end\");\n }\n\n if (entry.tryLoc <= this.prev) {\n var hasCatch = hasOwn.call(entry, \"catchLoc\");\n var hasFinally = hasOwn.call(entry, \"finallyLoc\");\n\n if (hasCatch && hasFinally) {\n if (this.prev < entry.catchLoc) {\n return handle(entry.catchLoc, true);\n } else if (this.prev < entry.finallyLoc) {\n return handle(entry.finallyLoc);\n }\n\n } else if (hasCatch) {\n if (this.prev < entry.catchLoc) {\n return handle(entry.catchLoc, true);\n }\n\n } else if (hasFinally) {\n if (this.prev < entry.finallyLoc) {\n return handle(entry.finallyLoc);\n }\n\n } else {\n throw new Error(\"try statement without catch or finally\");\n }\n }\n }\n },\n\n abrupt: function(type, arg) {\n for (var i = this.tryEntries.length - 1; i >= 0; --i) {\n var entry = this.tryEntries[i];\n if (entry.tryLoc <= this.prev &&\n hasOwn.call(entry, \"finallyLoc\") &&\n this.prev < entry.finallyLoc) {\n var finallyEntry = entry;\n break;\n }\n }\n\n if (finallyEntry &&\n (type === \"break\" ||\n type === \"continue\") &&\n finallyEntry.tryLoc <= arg &&\n arg <= finallyEntry.finallyLoc) {\n // Ignore the finally entry if control is not jumping to a\n // location outside the try/catch block.\n finallyEntry = null;\n }\n\n var record = finallyEntry ? finallyEntry.completion : {};\n record.type = type;\n record.arg = arg;\n\n if (finallyEntry) {\n this.next = finallyEntry.finallyLoc;\n } else {\n this.complete(record);\n }\n\n return ContinueSentinel;\n },\n\n complete: function(record, afterLoc) {\n if (record.type === \"throw\") {\n throw record.arg;\n }\n\n if (record.type === \"break\" ||\n record.type === \"continue\") {\n this.next = record.arg;\n } else if (record.type === \"return\") {\n this.rval = record.arg;\n this.next = \"end\";\n } else if (record.type === \"normal\" && afterLoc) {\n this.next = afterLoc;\n }\n },\n\n finish: function(finallyLoc) {\n for (var i = this.tryEntries.length - 1; i >= 0; --i) {\n var entry = this.tryEntries[i];\n if (entry.finallyLoc === finallyLoc) {\n this.complete(entry.completion, entry.afterLoc);\n resetTryEntry(entry);\n return ContinueSentinel;\n }\n }\n },\n\n \"catch\": function(tryLoc) {\n for (var i = this.tryEntries.length - 1; i >= 0; --i) {\n var entry = this.tryEntries[i];\n if (entry.tryLoc === tryLoc) {\n var record = entry.completion;\n if (record.type === \"throw\") {\n var thrown = record.arg;\n resetTryEntry(entry);\n }\n return thrown;\n }\n }\n\n // The context.catch method must only be called with a location\n // argument that corresponds to a known catch block.\n throw new Error(\"illegal catch attempt\");\n },\n\n delegateYield: function(iterable, resultName, nextLoc) {\n this.delegate = {\n iterator: values(iterable),\n resultName: resultName,\n nextLoc: nextLoc\n };\n\n return ContinueSentinel;\n }\n };\n})(\n // Among the various tricks for obtaining a reference to the global\n // object, this seems to be the most reliable technique that does not\n // use indirect eval (which violates Content Security Policy).\n typeof global === \"object\" ? global :\n typeof window === \"object\" ? window :\n typeof self === \"object\" ? self : this\n);\n","/* @flow */\nclass AbstractTransaction { //eslint-disable-line no-unused-vars\n constructor (store : OperationStore) {\n this.store = store;\n }\n // Throws if operation is not expected.\n *addOperation (op) {\n var state = this.getState(op.id[0]);\n if (op.id[1] === state.clock){\n state.clock++;\n yield* this.setState(state);\n this.store.operationAdded(op);\n return true;\n } else {\n return false;\n }\n }\n}\n\ntype Listener = {\n f : GeneratorFunction, // is called when all operations are available\n missing : number // number of operations that are missing\n}\n\ntype Id = [string, number];\n\nclass AbstractOperationStore { //eslint-disable-line no-unused-vars\n constructor () {\n // E.g. this.listenersById[id] : Array<Listener>\n this.listenersById = {};\n // Execute the next time a transaction is requested\n this.listenersByIdExecuteNow = [];\n // A transaction is requested\n this.listenersByIdRequestPending = false;\n /* To make things more clear, the following naming conventions:\n * ls : we put this.listenersById on ls\n * l : Array<Listener>\n * id : Id (can't use as property name)\n * sid : String (converted from id via JSON.stringify\n so we can use it as a property name)\n\n Always remember to first overwrite over\n a property before you iterate over it!\n */\n }\n // f is called as soon as every operation requested is available.\n // Note that Transaction can (and should) buffer requests.\n whenOperationsExist (ids : Array<Id>, f : GeneratorFunction, args : Array<any>) {\n if (ids.length > 0) {\n let listener : Listener = {\n f: f,\n args: args || [],\n missing: ids.length\n };\n\n for (let id of ids) {\n let sid = JSON.stringify(id);\n let l = this.listenersById[sid];\n if (l == null){\n l = [];\n this.listenersById[sid] = l;\n }\n l.push(listener);\n }\n } else {\n this.listenersByIdExecuteNow.push({\n f: f,\n args: args || []\n });\n }\n\n if (this.listenersByIdRequestPending){\n return;\n }\n\n this.listenersByIdRequestPending = true;\n var store = this;\n\n this.requestTransaction(function*(){\n var exeNow = store.listenersByIdExecuteNow;\n store.listenersByIdExecuteNow = [];\n\n var ls = store.listenersById;\n store.listenersById = {};\n\n store.listenersByIdRequestPending = false;\n\n for (let listener of exeNow) {\n yield* listener.f.apply(this, listener.args);\n }\n\n for (var sid in ls){\n var l = ls[sid];\n var id = JSON.parse(sid);\n if ((yield* this.getOperation(id)) == null){\n store.listenersById[sid] = l;\n } else {\n for (let listener of l) {\n if (--listener.missing === 0){\n yield* listener.f.apply(this, listener.args);\n }\n }\n }\n }\n });\n }\n // called by a transaction when an operation is added\n operationAdded (op) {\n var l = this.listenersById[op.id];\n if (l != null) {\n for (var listener of l){\n if (--listener.missing === 0){\n this.whenOperationsExist([], listener.f, listener.args);\n }\n }\n }\n }\n}\n","/* @flow */\n\n// Op is anything that we could get from the OperationStore.\ntype Op = Object;\n\nvar Struct = {\n Operation: { //eslint-disable-line no-unused-vars\n create: function*(op : Op, user : string) : Struct.Operation {\n var state = yield* this.getState(user);\n op.id = [user, state.clock];\n return yield* this.addOperation(op);\n }\n },\n Insert: {\n create: function*( op : Op,\n user : string,\n left : Struct.Insert,\n right : Struct.Insert) : Struct.Insert {\n op.left = left ? left.id : null;\n op.origin = op.left;\n op.right = right ? right.id : null;\n op.type = \"Insert\";\n yield* Struct.Operation.create(op, user);\n\n if (left != null) {\n left.right = op.id;\n yield* this.setOperation(left);\n }\n if (right != null) {\n right.left = op.id;\n yield* this.setOperation(right);\n }\n return op;\n },\n requiredOps: function(op, ids){\n ids.push(op.left);\n ids.push(op.right);\n return ids;\n },\n execute: function*(op){\n return op;\n }\n }\n};\n","\ntype State = {\n user: string,\n clock: number\n};\n\ntype StateVector = Array<State>;\n\ntype StateSet = Object;\n\ntype IDBTransaction = Function;\ntype IDBObjectStore = Function;\ntype IDBRequest = Function;\ntype IDBCursor = Function;\ntype IDBKeyRange = Function;\n\ntype IDBOpenDBRequest = Function;\n\ndeclare var indexedDB : Object;\n\ndeclare var setTimeout : Function;\n\nvar GeneratorFunction = (function*(){}).constructor;\n\nvar IndexedDB = (function(){ //eslint-disable-line no-unused-vars\n class Transaction extends AbstractTransaction { //eslint-disable-line\n transaction: IDBTransaction;\n sv: IDBObjectStore;\n os: IDBObjectStore;\n store: OperationStore;\n\n constructor (store : OperationStore) {\n super(store);\n this.transaction = store.db.transaction([\"OperationStore\", \"StateVector\"], \"readwrite\");\n this.sv = this.transaction.objectStore(\"StateVector\");\n this.os = this.transaction.objectStore(\"OperationStore\");\n this.buffer = {};\n }\n *setOperation (op) {\n yield this.os.put(op);\n this.buffer[JSON.stringify(op.id)] = op;\n return op;\n }\n *getOperation (id) {\n var op = this.buffer[JSON.stringify(id)];\n if (op == null) {\n op = yield this.os.get(id);\n this.buffer[JSON.stringify(id)] = op;\n }\n return op;\n }\n *removeOperation (id) {\n this.buffer[JSON.stringify(id)] = null;\n return yield this.os.delete(id);\n }\n *setState (state : State) : State {\n return yield this.sv.put(state);\n }\n *getState (user : string) : State {\n var state;\n if ((state = yield this.sv.get(user)) != null){\n return state;\n } else {\n return {\n user: user,\n clock: 0\n };\n }\n }\n *getStateVector () : StateVector {\n var stateVector = [];\n var cursorResult = this.sv.openCursor();\n var cursor;\n while ((cursor = yield cursorResult) != null) {\n stateVector.push(cursor.value);\n cursor.continue();\n }\n return stateVector;\n }\n *getStateSet () : StateSet {\n var sv : StateVector = yield* this.getStateVector();\n var ss : StateSet = {};\n for (var state of sv){\n ss[state.user] = state.clock;\n }\n return ss;\n }\n\n *getOperations (startSS : StateSet) {\n if (startSS == null){\n startSS = {};\n }\n var ops = [];\n\n var endSV : StateVector = yield* this.getStateVector();\n for (var endState of endSV) {\n var user = endState.user;\n var startPos = startSS[user] || 0;\n var endPos = endState.clock;\n var range = IDBKeyRange.bound([user, startPos], [user, endPos]);\n var cursorResult = this.os.openCursor(range);\n var cursor;\n while ((cursor = yield cursorResult) != null) {\n ops.push(cursor.value);\n cursor.continue();\n }\n }\n return ops;\n }\n }\n class OperationStore extends AbstractOperationStore { //eslint-disable-line no-undef\n namespace: string;\n ready: Promise;\n whenReadyListeners: Array<Function>;\n constructor (namespace : string) {\n super();\n this.namespace = namespace;\n this.transactionQueue = {\n queue: [],\n onRequest: null\n };\n\n var store = this;\n\n var tGen = (function *transactionGen(){\n store.db = yield indexedDB.open(namespace, 3);\n var transactionQueue = store.transactionQueue;\n\n var transaction = null;\n var cont = true;\n while (cont) {\n var request = yield transactionQueue;\n transaction = new Transaction(store);\n\n yield* request.call(transaction);/*\n while (transactionQueue.queue.length > 0) {\n yield* transactionQueue.queue.shift().call(transaction);\n }*/\n }\n })();\n\n function handleTransactions(t){ //eslint-disable-line no-unused-vars\n var request = t.value;\n if (t.done){\n } else if (request.constructor === IDBRequest\n || request.constructor === IDBCursor ) {\n request.onsuccess = function(){\n handleTransactions(tGen.next(request.result));\n };\n request.onerror = function(err){\n tGen.throw(err);\n };\n } else if (request === store.transactionQueue) {\n if (request.queue.length > 0){\n handleTransactions(tGen.next(request.queue.shift()));\n } else {\n request.onRequest = function(){\n request.onRequest = null;\n handleTransactions(tGen.next(request.queue.shift()));\n };\n }\n } else if ( request.constructor === IDBOpenDBRequest ) {\n request.onsuccess = function(event){\n var db = event.target.result;\n handleTransactions(tGen.next(db));\n };\n request.onerror = function(){\n tGen.throw(\"Couldn't open IndexedDB database!\");\n };\n request.onupgradeneeded = function(event){\n var db = event.target.result;\n db.createObjectStore(\"OperationStore\", {keyPath: \"id\"});\n db.createObjectStore(\"StateVector\", {keyPath: \"user\"});\n };\n } else {\n tGen.throw(\"You can not yield this type!\");\n }\n }\n handleTransactions(tGen.next());\n\n }\n requestTransaction (makeGen : Function) {\n this.transactionQueue.queue.push(makeGen);\n if (this.transactionQueue.onRequest != null) {\n this.transactionQueue.onRequest();\n }\n }\n *removeDatabase () {\n this.db.close();\n yield indexedDB.deleteDatabase(this.namespace);\n }\n }\n return OperationStore;\n})();\n"],"sourceRoot":"/source/"}
\ No newline at end of file
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* Copyright (c) 2014, Facebook, Inc.\n * All rights reserved.\n *\n * This source code is licensed under the BSD-style license found in the\n * https://raw.github.com/facebook/regenerator/master/LICENSE file. An\n * additional grant of patent rights can be found in the PATENTS file in\n * the same directory.\n */\n\n!(function(global) {\n \"use strict\";\n\n var hasOwn = Object.prototype.hasOwnProperty;\n var undefined; // More compressible than void 0.\n var iteratorSymbol =\n typeof Symbol === \"function\" && Symbol.iterator || \"@@iterator\";\n\n var inModule = typeof module === \"object\";\n var runtime = global.regeneratorRuntime;\n if (runtime) {\n if (inModule) {\n // If regeneratorRuntime is defined globally and we're in a module,\n // make the exports object identical to regeneratorRuntime.\n module.exports = runtime;\n }\n // Don't bother evaluating the rest of this file if the runtime was\n // already defined globally.\n return;\n }\n\n // Define the runtime globally (as expected by generated code) as either\n // module.exports (if we're in a module) or a new, empty object.\n runtime = global.regeneratorRuntime = inModule ? module.exports : {};\n\n function wrap(innerFn, outerFn, self, tryLocsList) {\n // If outerFn provided, then outerFn.prototype instanceof Generator.\n var generator = Object.create((outerFn || Generator).prototype);\n\n generator._invoke = makeInvokeMethod(\n innerFn, self || null,\n new Context(tryLocsList || [])\n );\n\n return generator;\n }\n runtime.wrap = wrap;\n\n // Try/catch helper to minimize deoptimizations. Returns a completion\n // record like context.tryEntries[i].completion. This interface could\n // have been (and was previously) designed to take a closure to be\n // invoked without arguments, but in all the cases we care about we\n // already have an existing method we want to call, so there's no need\n // to create a new function object. We can even get away with assuming\n // the method takes exactly one argument, since that happens to be true\n // in every case, so we don't have to touch the arguments object. The\n // only additional allocation required is the completion record, which\n // has a stable shape and so hopefully should be cheap to allocate.\n function tryCatch(fn, obj, arg) {\n try {\n return { type: \"normal\", arg: fn.call(obj, arg) };\n } catch (err) {\n return { type: \"throw\", arg: err };\n }\n }\n\n var GenStateSuspendedStart = \"suspendedStart\";\n var GenStateSuspendedYield = \"suspendedYield\";\n var GenStateExecuting = \"executing\";\n var GenStateCompleted = \"completed\";\n\n // Returning this object from the innerFn has the same effect as\n // breaking out of the dispatch switch statement.\n var ContinueSentinel = {};\n\n // Dummy constructor functions that we use as the .constructor and\n // .constructor.prototype properties for functions that return Generator\n // objects. For full spec compliance, you may wish to configure your\n // minifier not to mangle the names of these two functions.\n function Generator() {}\n function GeneratorFunction() {}\n function GeneratorFunctionPrototype() {}\n\n var Gp = GeneratorFunctionPrototype.prototype = Generator.prototype;\n GeneratorFunction.prototype = Gp.constructor = GeneratorFunctionPrototype;\n GeneratorFunctionPrototype.constructor = GeneratorFunction;\n GeneratorFunction.displayName = \"GeneratorFunction\";\n\n // Helper for defining the .next, .throw, and .return methods of the\n // Iterator interface in terms of a single ._invoke method.\n function defineIteratorMethods(prototype) {\n [\"next\", \"throw\", \"return\"].forEach(function(method) {\n prototype[method] = function(arg) {\n return this._invoke(method, arg);\n };\n });\n }\n\n runtime.isGeneratorFunction = function(genFun) {\n var ctor = typeof genFun === \"function\" && genFun.constructor;\n return ctor\n ? ctor === GeneratorFunction ||\n // For the native GeneratorFunction constructor, the best we can\n // do is to check its .name property.\n (ctor.displayName || ctor.name) === \"GeneratorFunction\"\n : false;\n };\n\n runtime.mark = function(genFun) {\n genFun.__proto__ = GeneratorFunctionPrototype;\n genFun.prototype = Object.create(Gp);\n return genFun;\n };\n\n // Within the body of any async function, `await x` is transformed to\n // `yield regeneratorRuntime.awrap(x)`, so that the runtime can test\n // `value instanceof AwaitArgument` to determine if the yielded value is\n // meant to be awaited. Some may consider the name of this method too\n // cutesy, but they are curmudgeons.\n runtime.awrap = function(arg) {\n return new AwaitArgument(arg);\n };\n\n function AwaitArgument(arg) {\n this.arg = arg;\n }\n\n function AsyncIterator(generator) {\n // This invoke function is written in a style that assumes some\n // calling function (or Promise) will handle exceptions.\n function invoke(method, arg) {\n var result = generator[method](arg);\n var value = result.value;\n return value instanceof AwaitArgument\n ? Promise.resolve(value.arg).then(invokeNext, invokeThrow)\n : Promise.resolve(value).then(function(unwrapped) {\n result.value = unwrapped;\n return result;\n }, invokeThrow);\n }\n\n if (typeof process === \"object\" && process.domain) {\n invoke = process.domain.bind(invoke);\n }\n\n var invokeNext = invoke.bind(generator, \"next\");\n var invokeThrow = invoke.bind(generator, \"throw\");\n var invokeReturn = invoke.bind(generator, \"return\");\n var previousPromise;\n\n function enqueue(method, arg) {\n var enqueueResult =\n // If enqueue has been called before, then we want to wait until\n // all previous Promises have been resolved before calling invoke,\n // so that results are always delivered in the correct order. If\n // enqueue has not been called before, then it is important to\n // call invoke immediately, without waiting on a callback to fire,\n // so that the async generator function has the opportunity to do\n // any necessary setup in a predictable way. This predictability\n // is why the Promise constructor synchronously invokes its\n // executor callback, and why async functions synchronously\n // execute code before the first await. Since we implement simple\n // async functions in terms of async generators, it is especially\n // important to get this right, even though it requires care.\n previousPromise ? previousPromise.then(function() {\n return invoke(method, arg);\n }) : new Promise(function(resolve) {\n resolve(invoke(method, arg));\n });\n\n // Avoid propagating enqueueResult failures to Promises returned by\n // later invocations of the iterator, and call generator.return() to\n // allow the generator a chance to clean up.\n previousPromise = enqueueResult[\"catch\"](invokeReturn);\n\n return enqueueResult;\n }\n\n // Define the unified helper method that is used to implement .next,\n // .throw, and .return (see defineIteratorMethods).\n this._invoke = enqueue;\n }\n\n defineIteratorMethods(AsyncIterator.prototype);\n\n // Note that simple async functions are implemented on top of\n // AsyncIterator objects; they just return a Promise for the value of\n // the final result produced by the iterator.\n runtime.async = function(innerFn, outerFn, self, tryLocsList) {\n var iter = new AsyncIterator(\n wrap(innerFn, outerFn, self, tryLocsList)\n );\n\n return runtime.isGeneratorFunction(outerFn)\n ? iter // If outerFn is a generator, return the full iterator.\n : iter.next().then(function(result) {\n return result.done ? result.value : iter.next();\n });\n };\n\n function makeInvokeMethod(innerFn, self, context) {\n var state = GenStateSuspendedStart;\n\n return function invoke(method, arg) {\n if (state === GenStateExecuting) {\n throw new Error(\"Generator is already running\");\n }\n\n if (state === GenStateCompleted) {\n // Be forgiving, per 25.3.3.3.3 of the spec:\n // https://people.mozilla.org/~jorendorff/es6-draft.html#sec-generatorresume\n return doneResult();\n }\n\n while (true) {\n var delegate = context.delegate;\n if (delegate) {\n if (method === \"return\" ||\n (method === \"throw\" && delegate.iterator[method] === undefined)) {\n // A return or throw (when the delegate iterator has no throw\n // method) always terminates the yield* loop.\n context.delegate = null;\n\n // If the delegate iterator has a return method, give it a\n // chance to clean up.\n var returnMethod = delegate.iterator[\"return\"];\n if (returnMethod) {\n var record = tryCatch(returnMethod, delegate.iterator, arg);\n if (record.type === \"throw\") {\n // If the return method threw an exception, let that\n // exception prevail over the original return or throw.\n method = \"throw\";\n arg = record.arg;\n continue;\n }\n }\n\n if (method === \"return\") {\n // Continue with the outer return, now that the delegate\n // iterator has been terminated.\n continue;\n }\n }\n\n var record = tryCatch(\n delegate.iterator[method],\n delegate.iterator,\n arg\n );\n\n if (record.type === \"throw\") {\n context.delegate = null;\n\n // Like returning generator.throw(uncaught), but without the\n // overhead of an extra function call.\n method = \"throw\";\n arg = record.arg;\n continue;\n }\n\n // Delegate generator ran and handled its own exceptions so\n // regardless of what the method was, we continue as if it is\n // \"next\" with an undefined arg.\n method = \"next\";\n arg = undefined;\n\n var info = record.arg;\n if (info.done) {\n context[delegate.resultName] = info.value;\n context.next = delegate.nextLoc;\n } else {\n state = GenStateSuspendedYield;\n return info;\n }\n\n context.delegate = null;\n }\n\n if (method === \"next\") {\n if (state === GenStateSuspendedYield) {\n context.sent = arg;\n } else {\n delete context.sent;\n }\n\n } else if (method === \"throw\") {\n if (state === GenStateSuspendedStart) {\n state = GenStateCompleted;\n throw arg;\n }\n\n if (context.dispatchException(arg)) {\n // If the dispatched exception was caught by a catch block,\n // then let that catch block handle the exception normally.\n method = \"next\";\n arg = undefined;\n }\n\n } else if (method === \"return\") {\n context.abrupt(\"return\", arg);\n }\n\n state = GenStateExecuting;\n\n var record = tryCatch(innerFn, self, context);\n if (record.type === \"normal\") {\n // If an exception is thrown from innerFn, we leave state ===\n // GenStateExecuting and loop back for another invocation.\n state = context.done\n ? GenStateCompleted\n : GenStateSuspendedYield;\n\n var info = {\n value: record.arg,\n done: context.done\n };\n\n if (record.arg === ContinueSentinel) {\n if (context.delegate && method === \"next\") {\n // Deliberately forget the last sent value so that we don't\n // accidentally pass it on to the delegate.\n arg = undefined;\n }\n } else {\n return info;\n }\n\n } else if (record.type === \"throw\") {\n state = GenStateCompleted;\n // Dispatch the exception by looping back around to the\n // context.dispatchException(arg) call above.\n method = \"throw\";\n arg = record.arg;\n }\n }\n };\n }\n\n // Define Generator.prototype.{next,throw,return} in terms of the\n // unified ._invoke helper method.\n defineIteratorMethods(Gp);\n\n Gp[iteratorSymbol] = function() {\n return this;\n };\n\n Gp.toString = function() {\n return \"[object Generator]\";\n };\n\n function pushTryEntry(locs) {\n var entry = { tryLoc: locs[0] };\n\n if (1 in locs) {\n entry.catchLoc = locs[1];\n }\n\n if (2 in locs) {\n entry.finallyLoc = locs[2];\n entry.afterLoc = locs[3];\n }\n\n this.tryEntries.push(entry);\n }\n\n function resetTryEntry(entry) {\n var record = entry.completion || {};\n record.type = \"normal\";\n delete record.arg;\n entry.completion = record;\n }\n\n function Context(tryLocsList) {\n // The root entry object (effectively a try statement without a catch\n // or a finally block) gives us a place to store values thrown from\n // locations where there is no enclosing try statement.\n this.tryEntries = [{ tryLoc: \"root\" }];\n tryLocsList.forEach(pushTryEntry, this);\n this.reset();\n }\n\n runtime.keys = function(object) {\n var keys = [];\n for (var key in object) {\n keys.push(key);\n }\n keys.reverse();\n\n // Rather than returning an object with a next method, we keep\n // things simple and return the next function itself.\n return function next() {\n while (keys.length) {\n var key = keys.pop();\n if (key in object) {\n next.value = key;\n next.done = false;\n return next;\n }\n }\n\n // To avoid creating an additional object, we just hang the .value\n // and .done properties off the next function object itself. This\n // also ensures that the minifier will not anonymize the function.\n next.done = true;\n return next;\n };\n };\n\n function values(iterable) {\n if (iterable) {\n var iteratorMethod = iterable[iteratorSymbol];\n if (iteratorMethod) {\n return iteratorMethod.call(iterable);\n }\n\n if (typeof iterable.next === \"function\") {\n return iterable;\n }\n\n if (!isNaN(iterable.length)) {\n var i = -1, next = function next() {\n while (++i < iterable.length) {\n if (hasOwn.call(iterable, i)) {\n next.value = iterable[i];\n next.done = false;\n return next;\n }\n }\n\n next.value = undefined;\n next.done = true;\n\n return next;\n };\n\n return next.next = next;\n }\n }\n\n // Return an iterator with no values.\n return { next: doneResult };\n }\n runtime.values = values;\n\n function doneResult() {\n return { value: undefined, done: true };\n }\n\n Context.prototype = {\n constructor: Context,\n\n reset: function() {\n this.prev = 0;\n this.next = 0;\n this.sent = undefined;\n this.done = false;\n this.delegate = null;\n\n this.tryEntries.forEach(resetTryEntry);\n\n // Pre-initialize at least 20 temporary variables to enable hidden\n // class optimizations for simple generators.\n for (var tempIndex = 0, tempName;\n hasOwn.call(this, tempName = \"t\" + tempIndex) || tempIndex < 20;\n ++tempIndex) {\n this[tempName] = null;\n }\n },\n\n stop: function() {\n this.done = true;\n\n var rootEntry = this.tryEntries[0];\n var rootRecord = rootEntry.completion;\n if (rootRecord.type === \"throw\") {\n throw rootRecord.arg;\n }\n\n return this.rval;\n },\n\n dispatchException: function(exception) {\n if (this.done) {\n throw exception;\n }\n\n var context = this;\n function handle(loc, caught) {\n record.type = \"throw\";\n record.arg = exception;\n context.next = loc;\n return !!caught;\n }\n\n for (var i = this.tryEntries.length - 1; i >= 0; --i) {\n var entry = this.tryEntries[i];\n var record = entry.completion;\n\n if (entry.tryLoc === \"root\") {\n // Exception thrown outside of any try block that could handle\n // it, so set the completion value of the entire function to\n // throw the exception.\n return handle(\"end\");\n }\n\n if (entry.tryLoc <= this.prev) {\n var hasCatch = hasOwn.call(entry, \"catchLoc\");\n var hasFinally = hasOwn.call(entry, \"finallyLoc\");\n\n if (hasCatch && hasFinally) {\n if (this.prev < entry.catchLoc) {\n return handle(entry.catchLoc, true);\n } else if (this.prev < entry.finallyLoc) {\n return handle(entry.finallyLoc);\n }\n\n } else if (hasCatch) {\n if (this.prev < entry.catchLoc) {\n return handle(entry.catchLoc, true);\n }\n\n } else if (hasFinally) {\n if (this.prev < entry.finallyLoc) {\n return handle(entry.finallyLoc);\n }\n\n } else {\n throw new Error(\"try statement without catch or finally\");\n }\n }\n }\n },\n\n abrupt: function(type, arg) {\n for (var i = this.tryEntries.length - 1; i >= 0; --i) {\n var entry = this.tryEntries[i];\n if (entry.tryLoc <= this.prev &&\n hasOwn.call(entry, \"finallyLoc\") &&\n this.prev < entry.finallyLoc) {\n var finallyEntry = entry;\n break;\n }\n }\n\n if (finallyEntry &&\n (type === \"break\" ||\n type === \"continue\") &&\n finallyEntry.tryLoc <= arg &&\n arg <= finallyEntry.finallyLoc) {\n // Ignore the finally entry if control is not jumping to a\n // location outside the try/catch block.\n finallyEntry = null;\n }\n\n var record = finallyEntry ? finallyEntry.completion : {};\n record.type = type;\n record.arg = arg;\n\n if (finallyEntry) {\n this.next = finallyEntry.finallyLoc;\n } else {\n this.complete(record);\n }\n\n return ContinueSentinel;\n },\n\n complete: function(record, afterLoc) {\n if (record.type === \"throw\") {\n throw record.arg;\n }\n\n if (record.type === \"break\" ||\n record.type === \"continue\") {\n this.next = record.arg;\n } else if (record.type === \"return\") {\n this.rval = record.arg;\n this.next = \"end\";\n } else if (record.type === \"normal\" && afterLoc) {\n this.next = afterLoc;\n }\n },\n\n finish: function(finallyLoc) {\n for (var i = this.tryEntries.length - 1; i >= 0; --i) {\n var entry = this.tryEntries[i];\n if (entry.finallyLoc === finallyLoc) {\n this.complete(entry.completion, entry.afterLoc);\n resetTryEntry(entry);\n return ContinueSentinel;\n }\n }\n },\n\n \"catch\": function(tryLoc) {\n for (var i = this.tryEntries.length - 1; i >= 0; --i) {\n var entry = this.tryEntries[i];\n if (entry.tryLoc === tryLoc) {\n var record = entry.completion;\n if (record.type === \"throw\") {\n var thrown = record.arg;\n resetTryEntry(entry);\n }\n return thrown;\n }\n }\n\n // The context.catch method must only be called with a location\n // argument that corresponds to a known catch block.\n throw new Error(\"illegal catch attempt\");\n },\n\n delegateYield: function(iterable, resultName, nextLoc) {\n this.delegate = {\n iterator: values(iterable),\n resultName: resultName,\n nextLoc: nextLoc\n };\n\n return ContinueSentinel;\n }\n };\n})(\n // Among the various tricks for obtaining a reference to the global\n // object, this seems to be the most reliable technique that does not\n // use indirect eval (which violates Content Security Policy).\n typeof global === \"object\" ? global :\n typeof window === \"object\" ? window :\n typeof self === \"object\" ? self : this\n);\n","/* @flow */\nclass AbstractTransaction { //eslint-disable-line no-unused-vars\n constructor (store : OperationStore) {\n this.store = store;\n }\n // Throws if operation is not expected.\n *addOperation (op) {\n var state = this.getState(op.id[0]);\n if (op.id[1] === state.clock){\n state.clock++;\n yield* this.setState(state);\n this.store.operationAdded(op);\n return true;\n } else {\n return false;\n }\n }\n}\n\ntype Listener = {\n f : GeneratorFunction, // is called when all operations are available\n missing : number // number of operations that are missing\n}\n\ntype Id = [string, number];\n\nclass AbstractOperationStore { //eslint-disable-line no-unused-vars\n constructor () {\n // E.g. this.listenersById[id] : Array<Listener>\n this.listenersById = {};\n // Execute the next time a transaction is requested\n this.listenersByIdExecuteNow = [];\n // A transaction is requested\n this.listenersByIdRequestPending = false;\n /* To make things more clear, the following naming conventions:\n * ls : we put this.listenersById on ls\n * l : Array<Listener>\n * id : Id (can't use as property name)\n * sid : String (converted from id via JSON.stringify\n so we can use it as a property name)\n\n Always remember to first overwrite over\n a property before you iterate over it!\n */\n }\n // f is called as soon as every operation requested is available.\n // Note that Transaction can (and should) buffer requests.\n whenOperationsExist (ids : Array<Id>, f : GeneratorFunction, args : Array<any>) {\n if (ids.length > 0) {\n let listener : Listener = {\n f: f,\n args: args || [],\n missing: ids.length\n };\n\n for (let id of ids) {\n let sid = JSON.stringify(id);\n let l = this.listenersById[sid];\n if (l == null){\n l = [];\n this.listenersById[sid] = l;\n }\n l.push(listener);\n }\n } else {\n this.listenersByIdExecuteNow.push({\n f: f,\n args: args || []\n });\n }\n\n if (this.listenersByIdRequestPending){\n return;\n }\n\n this.listenersByIdRequestPending = true;\n var store = this;\n\n this.requestTransaction(function*(){\n var exeNow = store.listenersByIdExecuteNow;\n store.listenersByIdExecuteNow = [];\n\n var ls = store.listenersById;\n store.listenersById = {};\n\n store.listenersByIdRequestPending = false;\n\n for (let listener of exeNow) {\n yield* listener.f.apply(this, listener.args);\n }\n\n for (var sid in ls){\n var l = ls[sid];\n var id = JSON.parse(sid);\n if ((yield* this.getOperation(id)) == null){\n store.listenersById[sid] = l;\n } else {\n for (let listener of l) {\n if (--listener.missing === 0){\n yield* listener.f.apply(this, listener.args);\n }\n }\n }\n }\n });\n }\n // called by a transaction when an operation is added\n operationAdded (op) {\n var l = this.listenersById[op.id];\n if (l != null) {\n for (var listener of l){\n if (--listener.missing === 0){\n this.whenOperationsExist([], listener.f, listener.args);\n }\n }\n }\n }\n}\n","/* @flow */\n\n// Op is anything that we could get from the OperationStore.\ntype Op = Object;\n\nvar Struct = {\n Operation: { //eslint-disable-line no-unused-vars\n create: function*(op : Op, user : string) : Struct.Operation {\n var state = yield* this.getState(user);\n op.id = [user, state.clock];\n return yield* this.addOperation(op);\n }\n },\n Insert: {\n create: function*( op : Op,\n user : string,\n left : Struct.Insert,\n right : Struct.Insert) : Struct.Insert {\n op.left = left ? left.id : null;\n op.origin = op.left;\n op.right = right ? right.id : null;\n op.type = \"Insert\";\n yield* Struct.Operation.create(op, user);\n\n if (left != null) {\n left.right = op.id;\n yield* this.setOperation(left);\n }\n if (right != null) {\n right.left = op.id;\n yield* this.setOperation(right);\n }\n return op;\n },\n requiredOps: function(op, ids){\n ids.push(op.left);\n ids.push(op.right);\n return ids;\n },\n execute: function*(op){\n return op;\n }\n }\n};\n","\ntype State = {\n user: string,\n clock: number\n};\n\ntype StateVector = Array<State>;\n\ntype StateSet = Object;\n\ntype IDBTransaction = Function;\ntype IDBObjectStore = Function;\ntype IDBRequest = Function;\ntype IDBCursor = Function;\ntype IDBKeyRange = Function;\n\ntype IDBOpenDBRequest = Function;\n\ndeclare var indexedDB : Object;\n\nvar IndexedDB = (function(){ //eslint-disable-line no-unused-vars\n class Transaction extends AbstractTransaction { //eslint-disable-line\n transaction: IDBTransaction;\n sv: IDBObjectStore;\n os: IDBObjectStore;\n store: OperationStore;\n\n constructor (store : OperationStore) {\n super(store);\n this.transaction = store.db.transaction([\"OperationStore\", \"StateVector\"], \"readwrite\");\n this.sv = this.transaction.objectStore(\"StateVector\");\n this.os = this.transaction.objectStore(\"OperationStore\");\n this.buffer = {};\n }\n *setOperation (op) {\n yield this.os.put(op);\n this.buffer[JSON.stringify(op.id)] = op;\n return op;\n }\n *getOperation (id) {\n var op = this.buffer[JSON.stringify(id)];\n if (op == null) {\n op = yield this.os.get(id);\n this.buffer[JSON.stringify(id)] = op;\n }\n return op;\n }\n *removeOperation (id) {\n this.buffer[JSON.stringify(id)] = null;\n return yield this.os.delete(id);\n }\n *setState (state : State) : State {\n return yield this.sv.put(state);\n }\n *getState (user : string) : State {\n var state;\n if ((state = yield this.sv.get(user)) != null){\n return state;\n } else {\n return {\n user: user,\n clock: 0\n };\n }\n }\n *getStateVector () : StateVector {\n var stateVector = [];\n var cursorResult = this.sv.openCursor();\n var cursor;\n while ((cursor = yield cursorResult) != null) {\n stateVector.push(cursor.value);\n cursor.continue();\n }\n return stateVector;\n }\n *getStateSet () : StateSet {\n var sv : StateVector = yield* this.getStateVector();\n var ss : StateSet = {};\n for (var state of sv){\n ss[state.user] = state.clock;\n }\n return ss;\n }\n\n *getOperations (startSS : StateSet) {\n if (startSS == null){\n startSS = {};\n }\n var ops = [];\n\n var endSV : StateVector = yield* this.getStateVector();\n for (var endState of endSV) {\n var user = endState.user;\n var startPos = startSS[user] || 0;\n var endPos = endState.clock;\n var range = IDBKeyRange.bound([user, startPos], [user, endPos]);\n var cursorResult = this.os.openCursor(range);\n var cursor;\n while ((cursor = yield cursorResult) != null) {\n ops.push(cursor.value);\n cursor.continue();\n }\n }\n return ops;\n }\n }\n class OperationStore extends AbstractOperationStore { //eslint-disable-line no-undef\n namespace: string;\n ready: Promise;\n whenReadyListeners: Array<Function>;\n constructor (namespace : string) {\n super();\n this.namespace = namespace;\n this.transactionQueue = {\n queue: [],\n onRequest: null\n };\n\n var store = this;\n\n var tGen = (function *transactionGen(){\n store.db = yield indexedDB.open(namespace, 3);\n var transactionQueue = store.transactionQueue;\n\n var transaction = null;\n var cont = true;\n while (cont) {\n var request = yield transactionQueue;\n transaction = new Transaction(store);\n\n yield* request.call(transaction);/*\n while (transactionQueue.queue.length > 0) {\n yield* transactionQueue.queue.shift().call(transaction);\n }*/\n }\n })();\n\n function handleTransactions(t){ //eslint-disable-line no-unused-vars\n var request = t.value;\n if (t.done){\n return;\n } else if (request.constructor === IDBRequest\n || request.constructor === IDBCursor ) {\n request.onsuccess = function(){\n handleTransactions(tGen.next(request.result));\n };\n request.onerror = function(err){\n tGen.throw(err);\n };\n } else if (request === store.transactionQueue) {\n if (request.queue.length > 0){\n handleTransactions(tGen.next(request.queue.shift()));\n } else {\n request.onRequest = function(){\n request.onRequest = null;\n handleTransactions(tGen.next(request.queue.shift()));\n };\n }\n } else if ( request.constructor === IDBOpenDBRequest ) {\n request.onsuccess = function(event){\n var db = event.target.result;\n handleTransactions(tGen.next(db));\n };\n request.onerror = function(){\n tGen.throw(\"Couldn't open IndexedDB database!\");\n };\n request.onupgradeneeded = function(event){\n var db = event.target.result;\n db.createObjectStore(\"OperationStore\", {keyPath: \"id\"});\n db.createObjectStore(\"StateVector\", {keyPath: \"user\"});\n };\n } else {\n tGen.throw(\"You can not yield this type!\");\n }\n }\n handleTransactions(tGen.next());\n\n }\n requestTransaction (makeGen : Function) {\n this.transactionQueue.queue.push(makeGen);\n if (this.transactionQueue.onRequest != null) {\n this.transactionQueue.onRequest();\n }\n }\n *removeDatabase () {\n this.db.close();\n yield indexedDB.deleteDatabase(this.namespace);\n }\n }\n return OperationStore;\n})();\n"],"sourceRoot":"/source/"}
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