babble - npm Package Compare versions

Comparing version 0.7.0 to 0.8.0

dist/babble.min.js

@@ -1,2 +0,2 @@
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examples/ask_age.js

@@ -6,3 +6,4 @@ var babble = require('../index');
 
-emma.listen('what is your age?')
+// listen for messages containing either 'age' or 'how old'
+emma.listen(/age|how old/)
     .tell(function () {
@@ -9,0 +10,0 @@ return 25;

examples/guess_the_number.js

@@ -72,4 +72,4 @@ var babble = require('../index');
 
-  function decideToStart (response) {
-    return (response == 'ok') ? 'start': 'cancel';
+  function canStart (response) {
+    return (response == 'ok');
   }
@@ -112,6 +112,7 @@
   jack.ask('emma', 'lets play guess the number')
-      .decide(decideToStart, {
-        start:  babble.then(start).tell(guess).listen().then(checkGuess),
-        cancel: babble.then(whine)
-      });
+      .iif(
+        canStart,                                                 // condition
+        babble.then(start).tell(guess).listen().then(checkGuess), // trueBlock
+        babble.then(whine)                                        // falseBlock
+      );
 
@@ -118,0 +119,0 @@ })();

examples/say_hi.js

@@ -7,3 +7,6 @@ var babble = require('../index');
 emma.listen('hi')
-    .listen(printMessage)
+    .listen(function (message, context) {
+      console.log(context.from + ': ' + message);
+      return message;
+    })
     .decide(function (message, context) {
@@ -24,7 +27,4 @@ return (message.indexOf('age') != -1) ? 'age' : 'name';
     })
-    .listen(printMessage);
-
-function printMessage (message, context) {
-  console.log(context.from + ': ' + message);
-  return message;
-}
+    .listen(function (message, context) {
+      console.log(context.from + ': ' + message);
+    });

HISTORY.md

@@ -5,2 +5,13 @@ # babble history
 
+## 2014-08-07, version 0.8.0
+
+- Completely reworked the library internally to support asynchronous flows 
+  using promises.
+- Callbacks can now return promises to resolve callbacks for decisions, 
+  conditions, and responses asynchronously.
+- Implemented a new block: `IIf(condition, trueBlock, falseBlock)`.
+- `Babbler.listen` now has a start condition instead of a fixed string.
+  Condition can be a function, regexp, or any value. (Uses `iif` under the hood).
+
+
 ## 2014-08-01, version 0.7.0
@@ -7,0 +18,0 @@

lib/babble.js

@@ -9,2 +9,3 @@ 'use strict';
 var Decision = require('./block/Decision');
+var IIf = require('./block/IIf');
 
@@ -33,7 +34,3 @@ /**
 exports.tell = function (message) {
-  var callback = (typeof message === 'function') ? message : function () {
-    return message;
-  };
-
-  return new Tell(callback);
+  return new Tell(message);
 };
@@ -96,3 +93,7 @@
 /**
- * Listen for a message
+ * Listen for a message.
+ *
+ * Optionally a callback function can be provided, which is equivalent of
+ * doing `listen().then(callback)`.
+ *
  * @param {Function} [callback] Invoked as callback(message, context),
@@ -106,3 +107,7 @@ *                              where `message` is the just received message,
 exports.listen = function(callback) {
-  return new Listen(callback);
+  var block = new Listen();
+  if (callback) {
+    return block.then(callback);
+  }
+  return block;
 };
@@ -122,2 +127,39 @@
 
+/**
+ * IIf
+ * Create an iif block, which checks a condition and continues either with
+ * the trueBlock or the falseBlock. The input message is passed to the next
+ * block in the flow.
+ *
+ * Can be used as follows:
+ * - When `condition` evaluates true:
+ *   - when `trueBlock` is provided, the flow continues with `trueBlock`
+ *   - else, when there is a block connected to the IIf block, the flow continues
+ *     with that block.
+ * - When `condition` evaluates false:
+ *   - when `falseBlock` is provided, the flow continues with `falseBlock`
+ *
+ * Syntax:
+ *
+ *     new IIf(condition, trueBlock)
+ *     new IIf(condition, trueBlock [, falseBlock])
+ *     new IIf(condition).then(...)
+ *
+ * @param {Function | RegExp | *} condition   A condition returning true or false
+ *                                            In case of a function,
+ *                                            the function is invoked as
+ *                                            `condition(message, context)` and
+ *                                            must return a boolean. In case of
+ *                                            a RegExp, condition will be tested
+ *                                            to return true. In other cases,
+ *                                            non-strict equality is tested on
+ *                                            the input.
+ * @param {Block} [trueBlock]
+ * @param {Block} [falseBlock]
+ * @returns {Block}
+ */
+exports.iif = function (condition, trueBlock, falseBlock) {
+  return new IIf(condition, trueBlock, falseBlock);
+};
+
 // export the babbler prototype
@@ -131,2 +173,3 @@ exports.Babbler = Babbler;
   Decision: require('./block/Decision'),
+  IIf: require('./block/IIf'),
   Listen: require('./block/Listen'),
@@ -196,8 +239,13 @@ Tell: require('./block/Tell')
   var onMessageOriginal = actor.hasOwnProperty(onMessageName) ? actor[onMessageName] : null;
-  actor[onMessageName] = function (from, message) {
-    var handled = babbler._onMessage(message);
-    if (!handled) {
+  if (onMessageOriginal) {
+    actor[onMessageName] = function (from, message) {
+      babbler._onMessage(message);
       onMessageOriginal.call(actor, from, message);
-    }
-  };
+    };
+  }
+  else {
+    actor[onMessageName] = function (from, message) {
+      babbler._onMessage(message);
+    };
+  }
 
@@ -204,0 +252,0 @@ // attach send function to the babbler

lib/Babbler.js

@@ -7,2 +7,3 @@ 'use strict';
 var messagers = require('./messagers');
+var Conversation = require('./Conversation');
 var Block = require('./block/Block');
@@ -13,2 +14,4 @@ var Then = require('./block/Then');
 
+require('./block/IIf'); // append iif function to Block
+
 /**
@@ -29,4 +32,4 @@ * Babbler
   this.id = id;
-  this.listeners = {};
-  this.conversations = {};
+  this.listeners = [];      // Array.<Listen>
+  this.conversations = {};  // Array.<Array.<Conversation>> all open conversations
 
@@ -78,3 +81,3 @@ this.connect(); // automatically connect to the local message bus
   // the need to await the promise to resolve on the next tick.
-  var _resolve;
+  var _resolve = null;
   var connected = new Promise(function (resolve, reject) {
@@ -103,40 +106,60 @@ _resolve = resolve;
  * @param {{id: string, from: string, to: string, message: string}} envelope
- * @returns {boolean} Returns true when a message has been handled, else returns
- *                    false
  * @private
  */
 Babbler.prototype._onMessage = function (envelope) {
-  var conversation;
-  var trigger;
-  var message = envelope.message;
+  // ignore when envelope does not contain an id and message
+  if (!envelope || !('id' in envelope) || !('message' in envelope)) {
+    return;
+  }
 
-  //console.log('message', this.id, envelope); // TODO: cleanup
+  // console.log('_onMessage', envelope) // TODO: cleanup
 
-  // check the open conversations
-  conversation = this.conversations[envelope.id];
-  if (conversation) {
-    this._run(conversation, message);
-    return true;
+  var me = this;
+  var id = envelope.id;
+  var conversations = this.conversations[id];
+  if (conversations && conversations.length) {
+    // directly deliver to all open conversations with this id
+    conversations.forEach(function (conversation) {
+      conversation.deliver(envelope);
+    })
   }
   else {
-    // check the listeners to start a new conversation
-    trigger = this.listeners[message];
-    if (trigger) {
-      //console.log('message create a new conversation', trigger, trigger.callback); // TODO: cleanup
+    // start new conversations at each of the listeners
+    if (!conversations) {
+      conversations = [];
+    }
+    this.conversations[id] = conversations;
+
+    this.listeners.forEach(function (block) {
       // create a new conversation
-      conversation = {
-        id: envelope.id,
-        peer: envelope.from,
-        next: trigger,
+      var conversation = new Conversation({
+        id: id,
+        self: me.id,
+        other: envelope.from,
         context: {
           from: envelope.from
-        }
-      };
+        },
+        send: me.send
+      });
 
-      this._run(conversation, message);
-      return true;
-    }
+      // append this conversation to the list with conversations
+      conversations.push(conversation);
+
+      // deliver the first message to the new conversation
+      conversation.deliver(envelope);
+
+      // process the conversation
+      return me._process(block, conversation)
+          .then(function() {
+            // remove the conversation from the list again
+            var index = conversations.indexOf(conversation);
+            if (index !== -1) {
+              conversations.splice(index, 1);
+            }
+            if (conversations.length === 0) {
+              delete me.conversations[id];
+            }
+          });
+    });
   }
-
-  return false;
 };
@@ -154,6 +177,6 @@
  * Send a message
- * @param {String} id
- * @param {*} message
+ * @param {String} to  Id of a babbler
+ * @param {*} message  Any message. Message must be a stringifiable JSON object.
  */
-Babbler.prototype.send = function (id, message) {
+Babbler.prototype.send = function (to, message) {
   // send is overridden when running connect
@@ -165,3 +188,10 @@ throw new Error('Cannot send: not connected');
  * Listen for a specific event
- * @param {String} message
+ *
+ * Providing a condition will only start the flow when condition is met,
+ * this is equivalent of doing `listen().iif(condition)`
+ *
+ * Providing a callback function is equivalent of doing either
+ * `listen(message).then(callback)` or `listen().iif(message).then(callback)`.
+ *
+ * @param {function | RegExp | String | *} [condition]
  * @param {Function} [callback] Invoked as callback(message, context),
@@ -174,15 +204,14 @@ *                              where `message` is the just received message,
  */
-// TODO: remove callback from listen
-Babbler.prototype.listen = function (message, callback) {
-  if (typeof message !== 'string') {
-    throw new TypeError('Parameter message must be a string');
+Babbler.prototype.listen = function (condition, callback) {
+  var listen = new Listen();
+  this.listeners.push(listen);
+
+  var block = listen;
+  if (condition) {
+    block = listen.iif(condition);
   }
-
-  // TODO: add support for a string as callback
-
-  var listen = new Listen(callback);
-
-  this.listeners[message] = listen;
-
-  return listen;
+  if (callback) {
+    block = listen.then(callback);
+  }
+  return block;
 };
@@ -193,52 +222,33 @@
  * Creates a block Tell, and runs the block immediately.
- * @param {String} id       Babbler id
+ * @param {String} to       Babbler id
  * @param {Function | *} message
  * @return {Block} block    Last block in the created control flow
  */
-Babbler.prototype.tell = function (id, message) {
+Babbler.prototype.tell = function (to, message) {
+  var me = this;
   var cid = uuid.v4(); // create an id for this conversation
 
-  var block = new Tell();
-
   // create a new conversation
-  var conversation = {
+  var conversation = new Conversation({
     id: cid,
-    peer: id,
-    next: block,
+    self: this.id,
+    other: to,
     context: {
-      from: id
-    }
-  };
+      from: to
+    },
+    send: me.send
+  });
+  this.conversations[cid] = [conversation];
 
-  // override the `then` function, so we can immediately execute chained blocks
-  // until we encounter a Listen block.
-  var me = this;
-  block.then = function then (next) {
-    // turn a callback function into a Then block
-    if (typeof next === 'function') {
-      next = new Then(next);
-    }
+  var block = new Tell(message);
 
-    if (!(next instanceof Block)) {
-      throw new TypeError('Parameter next must be a Block or function');
-    }
+  // run the Tell block on the next tick, when the conversation flow is created
+  setTimeout(function () {
+    me._process(block, conversation)
+        .then(function () {
+          // cleanup the conversation
+          delete me.conversations[cid];
+    })
+  }, 0);
 
-    conversation.next = next;
-
-    if (next instanceof Listen) {
-      // add to the conversations queue
-      me.conversations[cid] = conversation;
-    }
-    else {
-      // execute immediately
-      message = me._run(conversation, message);
-      next.then = then;
-    }
-
-    return next;
-  };
-
-  // run the Tell block immediately
-  message = this._run(conversation, message);
-
   return block;
@@ -248,21 +258,7 @@ };
 /**
- * Create a control flow starting with a Then block
- * @param {Function} callback   Invoked as callback(message, context),
- *                              where `message` is the output from the previous
- *                              block in the chain, and `context` is an object
- *                              where state can be stored during a conversation.
- * @return {Then} then
- */
-/* TODO: implement Babbler.then
-Babbler.prototype.then = function (callback) {
-
-};
-*/
-
-/**
  * Send a question, listen for a response.
  * Creates two blocks: Tell and Listen, and runs them immediately.
- * This is equivalent of doing `Babbler.tell(id, message).listen(callback)`
- * @param {String} id             Babbler id
- * @param {* | Function} message
+ * This is equivalent of doing `Babbler.tell(to, message).listen(callback)`
+ * @param {String} to             Babbler id
+ * @param {* | Function} message  A message or a callback returning a message.
  * @param {Function} [callback] Invoked as callback(message, context),
@@ -275,5 +271,5 @@ *                              where `message` is the just received message,
  */
-Babbler.prototype.ask = function (id, message, callback) {
+Babbler.prototype.ask = function (to, message, callback) {
   return this
-      .tell(id, message)
+      .tell(to, message)
       .listen(callback);
@@ -283,44 +279,37 @@ };
 /**
- * Run next block for given conversation
- * @param {Object} conversation
- * @param {*} [message]
- * @return {*} message    Response returned by the last executed block
+ * Process a flow starting with `block`, given a conversation
+ * @param {Block} block
+ * @param {Conversation} conversation
+ * @return {Promise.<Conversation>} Resolves when the conversation is finished
  * @private
  */
-Babbler.prototype._run = function (conversation, message) {
-  // console.log('_run', conversation, message); // TODO: cleanup
+Babbler.prototype._process = function (block, conversation) {
+  return new Promise(function (resolve, reject) {
+    /**
+     * Process a block, given the conversation and a message which is chained
+     * from block to block.
+     * @param {Block} block
+     * @param {*} [message]
+     */
+    function process(block, message) {
+      //console.log('process', conversation.self, conversation.id, block.constructor.name, message) // TODO: cleanup
 
-  // remove the conversation from the queue
-  delete this.conversations[conversation.id];
-
-  var block = conversation.next;
-  do {
-    var next = block.execute(message, conversation.context);
-    message = next.result;
-
-    if (block.next instanceof Listen) {
-      // wait for a next incoming message
-      // Note: we add this listener *before* we send a message,
-      // this is needed in case the reply is send synchronously
-      conversation.next = block.next;
-      this.conversations[conversation.id] = conversation;
+      block.execute(conversation, message)
+          .then(function (next) {
+            if (next.block) {
+              // recursively evaluate the next block in the conversation flow
+              process(next.block, next.result);
+            }
+            else {
+              // we are done, this is the end of the conversation
+              resolve(conversation);
+            }
+          });
     }
 
-    if (block instanceof Tell) {
-      // send a response back to the other peer
-      this.send(conversation.peer, {
-        id: conversation.id,
-        from: this.id,
-        to: conversation.peer,
-        message: message
-      });
-    }
-
-    block = next.block;
-  }
-  while (block && !(block instanceof Listen));
-
-  return message;
+    // process the first block
+    process(block);
+  });
 };
 
 module.exports = Babbler;

lib/block/Block.js

@@ -14,7 +14,7 @@ 'use strict';
  * Execute the block
+ * @param {Conversation} conversation
  * @param {*} message
- * @param {Object} context
- * @return {{result: *, block: Block}} next
+ * @return {Promise.<{result: *, block: Block}, Error>} next
  */
-Block.prototype.execute = function (message, context) {
+Block.prototype.execute = function (conversation, message) {
   throw new Error('Cannot run an abstract Block');
@@ -21,0 +21,0 @@ };

lib/block/Decision.js

 'use strict';
 
+var Promise = require('es6-promise').Promise;
 var Block = require('./Block');
+var isPromise =require('../util').isPromise;
 
+require('./Then'); // extend Block with function then
+
 /**
@@ -33,4 +37,4 @@ * Decision
  *
- * @param arg1   Can be {function} decision or {Object} choices
- * @param [arg2] {Object} choices
+ * @param arg1
+ * @param arg2
  * @constructor
@@ -61,3 +65,3 @@ * @extends {Block}
   else {
-    decision = function (message) {
+    decision = function (message, context) {
       return message;
@@ -87,23 +91,23 @@ }
  * Execute the block
+ * @param {Conversation} conversation
  * @param {*} message
- * @param {Object} context
- * @return {{result: *, block: Block}} next
+ * @return {Promise.<{result: *, block: Block}, Error>} next
  */
-Decision.prototype.execute = function (message, context) {
-  var id = this.decision(message, context);
+Decision.prototype.execute = function (conversation, message) {
+  var me = this;
+  var id = this.decision(message, conversation.context);
 
-  if (typeof id !== 'string') {
-    throw new TypeError('Decision function must return a string containing ' +
-        'the id of the next block');
-  }
+  var resolve = isPromise(id) ? id : Promise.resolve(id);
+  return resolve.then(function (id) {
+    var next = me.choices[id];
 
-  var next = this.choices[id];
-  if (!next) {
-    throw new Error('Block with id "' + id + '" not found');
-  }
+    if (!next) {
+      throw new Error('Block with id "' + id + '" not found');
+    }
 
-  return {
-    result: message,
-    block: next
-  };
+    return {
+      result: message,
+      block: next
+    };
+  });
 };
@@ -167,3 +171,2 @@
 Block.prototype.decide = function (arg1, arg2) {
-  // TODO: test arguments.length > 2
   var decision = new Decision(arg1, arg2);
@@ -170,0 +173,0 @@

lib/block/Listen.js

 'use strict';
 
+var Promise = require('es6-promise').Promise;
 var Block = require('./Block');
+var Then = require('./Then');
 
@@ -9,41 +11,32 @@ /**
  * with the next block in the control flow.
- * @param {Function} [callback] Invoked as callback(message, context),
- *                              where `message` is the just received message,
- *                              and `context` is an object where state can be
- *                              stored during a conversation.
- *                              If callback is provided, the returned result of
- *                              the callback function is passed to the next
- *                              block, else, the received message is passed.
+ *
  * @constructor
  * @extends {Block}
  */
-function Listen (callback) {
+function Listen () {
   if (!(this instanceof Listen)) {
     throw new SyntaxError('Constructor must be called with the new operator');
   }
-
-  if (callback && !(typeof callback === 'function')) {
-    throw new TypeError('Parameter callback must be a Function');
-  }
-
-  this.callback = callback || function (message) {
-    return message;
-  };
 }
 
 Listen.prototype = Object.create(Block.prototype);
+Listen.prototype.constructor = Listen;
 
 /**
  * Execute the block
- * @param {*} message
- * @param {Object} context
- * @return {{result: *, block: Block}} next
+ * @param {Conversation} conversation
+ * @param {*} [message]   Message is ignored by Listen blocks
+ * @return {Promise.<{result: *, block: Block}, Error>} next
  */
-Listen.prototype.execute = function (message, context) {
-  var result = this.callback(message, context);
+Listen.prototype.execute = function (conversation, message) {
+  var me = this;
 
-  return {
-    result: result,
-    block: this.next
-  };
+  // wait until a message is received
+  return conversation.receive()
+      .then(function (message) {
+        return {
+          result: message,
+          block: me.next
+        }
+      });
 };
@@ -54,2 +47,6 @@
  * Returns the first block in the chain.
+ *
+ * Optionally a callback function can be provided, which is equivalent of
+ * doing `listen().then(callback)`.
+ *
  * @param {Function} [callback] Executed as callback(message: *, context: Object)
@@ -60,7 +57,10 @@ *                              Must return a result
 Block.prototype.listen = function (callback) {
-  var block = new Listen(callback);
-
-  return this.then(block);
+  var listen = new Listen();
+  var block = this.then(listen);
+  if (callback) {
+    block = block.then(callback);
+  }
+  return block;
 };
 
 module.exports = Listen;

lib/block/Tell.js

 'use strict';
 
+var Promise = require('es6-promise').Promise;
 var Block = require('./Block');
+var isPromise = require('../util').isPromise;
 
+require('./Then');   // extend Block with function then
+require('./Listen'); // extend Block with function listen
+
 /**
  * Tell
  * Send a message to the other peer.
- * @param {Function} [callback] Invoked as callback(message, context),
- *                              where `message` is the output from the previous
- *                              block in the chain, and `context` is an object
- *                              where state can be stored during a conversation.
- *                              The result returned by the function will be
- *                              send back to the sender.
- *                              If no callback is provided, the block will send
- *                              the output from previous block in the chain as
- *                              message.
+ * @param {* | Function} message  A static message or callback function
+ *                                returning a message dynamically.
+ *                                When `message` is a function, it will be
+ *                                invoked as callback(message, context),
+ *                                where `message` is the output from the
+ *                                previous block in the chain, and `context` is
+ *                                an object where state can be stored during a
+ *                                conversation.
  * @constructor
  * @extends {Block}
  */
-function Tell (callback) {
+function Tell (message) {
   if (!(this instanceof Tell)) {
@@ -25,26 +29,38 @@ throw new SyntaxError('Constructor must be called with the new operator');
 
-  if (callback && !(typeof callback === 'function')) {
-    throw new TypeError('Parameter callback must be a Function');
-  }
-
-  this.callback = callback || function (message) {
-    return message;
-  };
+  this.message = message;
 }
 
 Tell.prototype = Object.create(Block.prototype);
+Tell.prototype.constructor = Tell;
 
 /**
  * Execute the block
- * @param {*} message
- * @param {Object} context
- * @return {{result: *, block: Block}} next
+ * @param {Conversation} conversation
+ * @param {*} [message] A message is ignored by the Tell block
+ * @return {Promise.<{result: *, block: Block}, Error>} next
  */
-Tell.prototype.execute = function (message, context) {
-  var result = this.callback(message, context);
+Tell.prototype.execute = function (conversation, message) {
+  // resolve the message
+  var me = this;
+  var resolve;
+  if (typeof this.message === 'function') {
+    var result = this.message(message, conversation.context);
+    resolve = isPromise(result) ? result : Promise.resolve(result);
+  }
+  else {
+    resolve = Promise.resolve(this.message); // static string or value
+  }
 
-  return {
-    result: result,
-    block: this.next
-  };
+  return resolve
+      .then(function (result) {
+        var res = conversation.send(result);
+        var done = isPromise(res) ? res : Promise.resolve(res);
+
+        return done.then(function () {
+            return {
+              result: result,
+              block: me.next
+            };
+          });
+      });
 };
@@ -66,8 +82,4 @@
 Block.prototype.tell = function (message) {
-  var callback = (typeof message === 'function') ? message : function () {
-    return message;
-  };
+  var block = new Tell(message);
 
-  var block = new Tell(callback);
-
   return this.then(block);
@@ -74,0 +86,0 @@ };

lib/block/Then.js

 'use strict';
 
+var Promise = require('es6-promise').Promise;
 var Block = require('./Block');
+var isPromise = require('../util').isPromise;
 
@@ -28,16 +30,22 @@ /**
 Then.prototype = Object.create(Block.prototype);
+Then.prototype.constructor = Then;
 
 /**
  * Execute the block
+ * @param {Conversation} conversation
  * @param {*} message
- * @param {Object} context
- * @return {{result: *, block: Block}} next
+ * @return {Promise.<{result: *, block: Block}, Error>} next
  */
-Then.prototype.execute = function (message, context) {
-  var result = this.callback(message, context);
+Then.prototype.execute = function (conversation, message) {
+  var me = this;
+  var result = this.callback(message, conversation.context);
 
-  return {
-    result: result,
-    block: this.next
-  };
+  var resolve = isPromise(result) ? result : Promise.resolve(result);
+
+  return resolve.then(function (result) {
+    return {
+      result: result,
+      block: me.next
+    }
+  });
 };
@@ -44,0 +52,0 @@

lib/messagers.js

 'use strict';
 
+var Promise = require('es6-promise').Promise;
+
 // built-in messaging interfaces
@@ -29,4 +31,4 @@
 
-    send: function (id, message) {
-      PubSub.publish(id, message);
+    send: function (to, message) {
+      PubSub.publish(to, message);
     }
@@ -72,7 +74,10 @@ }
 
-    send: function (id, message) {
-      pubnub.publish({
-        channel: id,
-        message: message
-      });
+    send: function (to, message) {
+      return new Promise(function (resolve, reject) {
+        pubnub.publish({
+          channel: to,
+          message: message,
+          callback: resolve
+        });
+      })
     }
@@ -79,0 +84,0 @@ }

package.json

 {
   "name": "babble",
-  "version": "0.7.0",
+  "version": "0.8.0",
   "description": "Dynamic communication flows between message based actors.",
@@ -27,4 +27,3 @@ "author": "Jos de Jong <[e-mail]> (https://github.com/josdejong)",
   "scripts": {
-    "build": "browserify ./index.js -o ./dist/babble.js -s babble -x pubnub",
-    "minify": "npm run build; uglifyjs ./dist/babble.js --output ./dist/babble.min.js --source-map ./dist/babble.min.map --source-map-url ./babble.min.map --compress --mangle --comments",
+    "build": "browserify ./index.js -o ./dist/babble.js -s babble -x pubnub; uglifyjs ./dist/babble.js --output ./dist/babble.min.js --source-map ./dist/babble.map --source-map-url ./babble.min.map --compress --mangle --comments",
     "test": "mocha test --recursive --reporter spec"
@@ -31,0 +30,0 @@ },

README.md

@@ -7,3 +7,3 @@ # Babble
 is modeled as a control flow diagram containing blocks `ask`, `tell`, `listen`,
-`decide`, and `then`. Each block can link to a next block in the
+`iif`, `decide`, and `then`. Each block can link to a next block in the
 control flow. Conversations are dynamic: a scenario is build programmatically,
@@ -60,3 +60,4 @@ and the blocks can dynamically determine the next block in the scenario.
 
-emma.listen('what is your age?')
+// listen for messages containing either 'age' or 'how old'
+emma.listen(/age|how old/)
     .tell(function () {
@@ -88,3 +89,3 @@ return 25;
 
-![ask age](https://raw.github.com/enmasseio/babble/master/img/say_hi.png)
+![say hi](https://raw.github.com/enmasseio/babble/master/img/say_hi.png)
 
@@ -99,9 +100,7 @@ The scenario can be programmed as:
 
-function printMessage (message, context) {
-  console.log(context.from + ': ' + message);
-  return message;
-}
-
 emma.listen('hi')
-    .listen(printMessage)
+    .listen(function (message, context) {
+      console.log(context.from + ': ' + message);
+      return message;
+    })
     .decide(function (message, context) {
@@ -122,3 +121,5 @@ return (message.indexOf('age') != -1) ? 'age' : 'name';
     })
-    .listen(printMessage);
+    .listen(function (message, context) {
+      console.log(context.from + ': ' + message);
+    });
 ```
@@ -195,3 +196,2 @@
     });
-
 ```
@@ -204,6 +204,6 @@
 
-- `babble.ask(message: String [, callback: Function]) : Block`  
+- `babble.ask(message: String | Function [, callback: Function]) : Block`  
   Send a question and listen for a reply. 
+  This is equivalent of doing `tell(message).listen([callback])`.
 
-  This is equivalent of doing `tell(message).listen([callback])`.
 - `babble.babbler(id: String) : Babbler`  
@@ -245,2 +245,4 @@ Factory function to create a new Babbler.
   block in the control flow, which must be available in the provided `options`.
+  The function `decision` can also return a Promise resolving with an id for the 
+  next block.
   If `decision` is not provided, the next block will be mapped directly from the
@@ -251,5 +253,18 @@ `response`. Parameter `choices` is a map with the possible next blocks in the
 
+- `babble.iif(condition: function | RegExp | * [, trueBlock : Block] [, falseBlock : Block]) : Block`  
+  Create a control flow starting with an `IIf` block.
+  When the condition is a function, it can either return a boolean or a Promise
+  resolving with a boolean value.
+  When the condition evaluates `true`, `trueBlock` is executed. If no `trueBlock`
+  is provided, the next block in the chain will be executed.
+  When the condition evaluates `true`, `falseBlock` is executed.
+
 - `babble.listen([callback: Function])`  
   Wait for a message. The provided callback function is called as 
   `callback(response, context)`, where `response` is the just received message.
+  When the callback returns a promise, babble will wait with execution of the 
+  next block until the promise is resolved. The result returned by the callback
+  is passed to the next block in the chain.
+  Providing a callback function is equivalent of doing 
+  `babble.listen().then(callback)`.
 
@@ -260,4 +275,6 @@ - `babble.tell(message: Function | *) : Block`
   is called as `callback(response, context)`, where `response` is the latest
-  received message, and must return a result.
+  received message, and must return a result. 
   The returned result is send to the connected peer.
+  When the callback returns a Promise, the value returned when the promise
+  resolves will be send to the connected peer.
 
@@ -268,5 +285,8 @@ - `babble.then(next: Block | function) : Block`
   is called as `callback(response, context)`, where `response` is the latest
-  received message, and must return a result. The returned result is passed to 
-  the next block in the chain.
+  received message, and must return a result. 
+  When the callback returns a promise, babble will wait with execution of the 
+  next block until the promise is resolved. The result returned by the callback
+  is passed to the next block in the chain.
 
+
 - `babble.unbabblify(actor: Object) : Object`  
@@ -281,2 +301,3 @@ Unbabblify an actor. Returns the unbabblified actor.
 - `babble.block.Decision`
+- `babble.block.IIf`
 - `babble.block.Listen`
@@ -295,5 +316,4 @@ - `babble.block.Tell`
 
-- `ask(id: String, message: String [, callback: Function]) : Block`  
-  Send a question to another peer and listen for a reply. 
-  This is equivalent of doing `tell(id, message).listen([callback])`.
+- `ask(to: String, message: * | Function [, callback: Function]) : Block`  
+  This is equivalent of doing `tell(to, message).listen([callback])`.
   Other blocks can be chained to the returned block.
@@ -321,11 +341,24 @@
 
-- `listen(message: String [, callback: Function]) : Block`  
-  Listen for incoming messages. If there is a match, the returned control flow
-  block will be executed. Other blocks can be chained to the returned block.
+- `listen([condition: Function | RegExp | * [, callback: Function]]) : Block`  
+  Listen for incoming messages and start the conversation flow. 
+  Other blocks can be chained to the returned block.
 
-- `send(id: String, message: *)`  
+  Providing a condition will only start the flow when condition is met,
+  this is equivalent of doing `listen().iif(condition)`.
+  
+  Providing a callback function is equivalent of doing either 
+  `listen(message).then(callback)` or `listen().iif(message).then(callback)`.
+  The callback is invoked as `callback(message, context)`, and must return
+  either a result or a Promise resolving with a result. The result will be 
+  passed to the next block in the chain.
+
+- `send(to: String, message: *)`  
   Send a message to another peer.
 
-- `tell(id: String, message: Function | *)`  
+- `tell(to: String, message: Function | *)`  
   Send a notification to another peer.
+  `message` can be a static value or a callback function. When `message` is
+  a function, it is invoked as `callback(message, context)`, and must return
+  either a result or a Promise resolving with a result. The result will be 
+  sent to the other peer, and will be passed to the next block in the chain.
 
@@ -335,3 +368,3 @@ ### Block
 Blocks can be created via the factory functions available in `babble`
-(`tell`, `decide`, `then`, `listen`), or in a Babbler (`listen`, `tell`,
+(`tell`, `iif`, `decide`, `then`, `listen`), or in a Babbler (`listen`, `tell`,
 `ask`). Blocks can be chained together, resulting in a control flow. The results
@@ -346,11 +379,22 @@ returned by blocks are used as input argument for the next block in the chain.
   Returns the first block in the chain.
+
 - `decide([decision: function, ] choices: Object<String, Block>) : Block`  
   Append a `Decision` block to the control flow. Returns the first block in the
   chain.
-- `tell(message: *) : Block`  
+
+- `iif(condition: function | RegExp | * [, trueBlock : Block] [, falseBlock : Block]) : Block`  
+  Append an `IIf` block to the control flow. Returns the first block in the
+  chain. When the condition evaluates `true`, `trueBlock` is executed. 
+  If no `trueBlock` is provided, the next block in the chain will be executed.
+  When the condition evaluates `true`, `falseBlock` is executed.
+
+- `listen([callback: Function]) : Block`  
+  Append a `Listen` block to the control flow. Returns the first block in the
+  chain. Providing a callback function is equivalent of doing 
+  `listen().then(callback)`.
+
+- `tell(message: * | Function) : Block`  
   Append a `Tell` block to the control flow. Parameter `message` can be callback
   function or an object or value. Returns the first block in the chain.
-- `listen([callback: Function]) : Block`  
-  Append a `Listen` block to the control flow. Returns the first block in the
-  chain.
+
 - `then(block : Block | function) : Block`  
@@ -369,11 +413,10 @@ Append an arbitrary block to the control flow. When a callback function is
 
-To build the library `./dist/babble.js`, run:
+To build the library, run:
 
     npm run build
 
-To build and minify the library `./dist/babble.min.js`, run:
+This generates the files `./dist/babble.js`, `./dist/babble.min.js`, and 
+`./dist/babble.min.map`.
 
-    npm run minify
 
-
 ## Test
@@ -392,9 +435,6 @@
 
-- Implement mixin pattern, enrich any object (like an actor) with babbler functionality.
-- Implement an `if` function which can test a function, regexp, or 'string', and continue
-  with one block when condition is met or another block when not matched.
-- Implement a `filter` function, which only continues a chain when a condition is met. 
-- Implement error handling.
-- Implement support for returning promises from callbacks, to allow async callback functions.
+- Implement error handling and timeout conditions.
+- Implement support for returning promises from callbacks, allowing async 
+  callback functions.
 - Store message history in the context.
 - Implement conversations with multiple peers at the same time.

test/babble.test.js

@@ -8,2 +8,3 @@ var assert = require('assert');
 var Decision = require('../lib/block/Decision');
+var IIf = require('../lib/block/IIf');
 var Then = require('../lib/block/Then');
@@ -43,2 +44,7 @@
 
+  it('should create a flow starting with an iif block', function() {
+    var block = babble.iif(function () {});
+    assert.ok(block instanceof IIf);
+  });
+
   it('should create a flow starting with a Then block', function() {
@@ -45,0 +51,0 @@ var block = babble.then(function () {});

test/Babbler.test.js

@@ -52,7 +52,2 @@ var assert = require('assert');
 
-    it ('should throw an error when calling listen wrongly', function () {
-      assert.throws(function () {emma.listen({'a': 'not a string'})});
-      assert.throws(function () {emma.listen()});
-    });
-
   });
@@ -71,2 +66,13 @@
 
+    it('should tell a function as message', function(done) {
+      emma.listen('test', function (response) {
+            assert.equal(response, 'test');
+            done();
+          });
+
+      jack.tell('emma', function () {
+        return 'test';
+      });
+    });
+
     it('should tell two messages subsequently', function(done) {
@@ -120,3 +126,3 @@ emma.listen('foo')
 
-    it ('should send a message, listen, and send a reply', function(done) {
+    it('should send a message, listen, and send a reply', function(done) {
       emma.listen('count', function () {
@@ -139,3 +145,3 @@ return 0;
 
-    it ('should send an object as reply', function(done) {
+    it('should send an object as reply', function(done) {
       emma.listen('test')
@@ -152,3 +158,3 @@ .tell(function (response) {
 
-    it ('should send an object as reply (2)', function(done) {
+    it('should send an object as reply (2)', function(done) {
       emma.listen('test')
@@ -163,3 +169,3 @@ .tell({a: 2, b: 3});
 
-    it ('should invoke the callback provided with listener', function(done) {
+    it('should invoke the callback provided with listener', function(done) {
       emma.listen('what is you age?', function (response) {
@@ -173,3 +179,3 @@ assert.equal(response, 'what is you age?');
 
-    it ('should invoke the callback provided with ask', function(done) {
+    it('should invoke the callback provided with ask', function(done) {
       emma.listen('age')
@@ -218,2 +224,31 @@ .tell(function () {
 
+    it('should make a decision with an iif block', function(done) {
+      emma.listen('are you available?')
+          .tell(function (response) {
+            return 'yes';
+          });
+
+      jack.ask('emma', 'are you available?')
+          .iif('yes', new Then(function (message) {
+            assert.equal(message, 'yes');
+            done();
+          }), new Then(function (message) {
+            assert.ok(false, 'should not execute falseBlock')
+          }));
+    });
+
+    it('should make a decision with an inline iif block', function(done) {
+      emma.listen('are you available?')
+          .tell(function (response) {
+            return 'yes';
+          });
+
+      jack.ask('emma', 'are you available?')
+          .iif('yes')
+          .then(function (message) {
+            assert.equal(message, 'yes');
+            done();
+          });
+    });
+
     it('should run then blocks', function(done) {
@@ -245,3 +280,3 @@ var logs = [];
 
-    it ('should keep state in the context during the conversation', function(done) {
+    it('should keep state in the context during the conversation', function(done) {
       emma.listen('question', function () {
@@ -248,0 +283,0 @@ return 'a';

test/block/Decision.test.js

 var assert = require('assert');
+var Promise = require('es6-promise').Promise;
+var Conversation = require('../../lib/Conversation');
 var Block = require('../../lib/block/Block');
@@ -85,18 +87,22 @@ var Decision = require('../../lib/block/Decision');
 
-    var context = {};
-    var next = decision.execute('yes', context);
-    assert.deepEqual(next, {
-      result: 'yes',
-      block: yes
+    var conversation = new Conversation();
+    return decision.execute(conversation, 'yes').then(function (next) {
+      assert.deepEqual(next, {
+        result: 'yes',
+        block: yes
+      })
     })
   });
 
-  it('should execute a decision without arguments', function () {
+  it('should execute a decision function returning a Promise', function () {
     var yes = new Block();
     var no = new Block();
-    var decision = new Decision(function (response, context) {
-      assert.strictEqual(response, 'message');
-      assert.strictEqual(context, undefined);
-      return 'yes';
-    }, {
+    var fn = function () {
+      return new Promise(function (resolve, reject) {
+        setTimeout(function () {
+          resolve('yes');
+        }, 10);
+      });
+    };
+    var decision = new Decision(fn, {
       yes: yes,
@@ -106,6 +112,8 @@ no: no
 
-    var next = decision.execute('message');
-    assert.deepEqual(next, {
-      result: 'message',
-      block: yes
+    var conversation = new Conversation();
+    return decision.execute(conversation, 'yes').then(function (next) {
+      assert.deepEqual(next, {
+        result: 'yes',
+        block: yes
+      })
     })
@@ -116,3 +124,2 @@ });
     var yes = new Block();
-    var context = {a: 2};
     var decision = new Decision(function (response, context) {
@@ -126,7 +133,11 @@ assert.strictEqual(response, 'message');
 
-    var next = decision.execute('message', context);
-    assert.deepEqual(next, {
-      result: 'message',
-      block: yes
-    })
+    var conversation = new Conversation({
+      context: {a: 2}
+    });
+    return decision.execute(conversation, 'message').then(function (next) {
+      assert.deepEqual(next, {
+        result: 'message',
+        block: yes
+      })
+    });
   });
@@ -136,3 +147,2 @@
     var yes = new Block();
-    var context = {a: 2};
     var decision = new Decision(function (response, context) {
@@ -146,9 +156,13 @@ assert.strictEqual(response, 'hello world');
 
-    var next = decision.execute('hello world', context);
-    assert.deepEqual(next, {
-      result: 'hello world',
-      block: yes
-    })
+    var conversation = new Conversation({
+      context: {a: 2}
+    });
+    return decision.execute(conversation, 'hello world').then(function (next) {
+      assert.deepEqual(next, {
+        result: 'hello world',
+        block: yes
+      })
+    });
   });
 
 });

test/block/Listen.test.js

 var assert = require('assert');
+var Promise = require('es6-promise').Promise;
+var Conversation = require('../../lib/Conversation');
+var Block = require('../../lib/block/Block');
 var Listen = require('../../lib/block/Listen');
+var IIf = require('../../lib/block/IIf');
+var Then = require('../../lib/block/Then');
 
@@ -16,70 +21,73 @@ describe('Listen', function() {
     assert.throws(function () { Listen(function () {}) }, SyntaxError);
-    assert.throws(function () { new Listen('bla')}, TypeError);
   });
 
-  it('should execute a listener without arguments', function () {
-    var listener = new Listen(function (response, context) {
-      assert.strictEqual(response, undefined);
-      assert.strictEqual(context, undefined);
-      return 'foo';
-    });
+  it('should execute a listener', function () {
+    var listener = new Listen();
 
-    var next = listener.execute();
-    assert.deepEqual(next, {
-      result: 'foo',
-      block: undefined
-    })
-  });
+    var conversation = new Conversation();
+    conversation.deliver({message: 'foo'});
 
-  it('should execute a listener with context', function () {
-    var context = {a: 2};
-    var listener = new Listen(function (response, context) {
-      assert.strictEqual(response, undefined);
-      assert.deepEqual(context, {a: 2});
-      return 'foo';
+    return listener.execute(conversation).then(function(next) {
+      assert.deepEqual(next, {
+        result: 'foo',
+        block: undefined
+      })
     });
-
-    var next = listener.execute(undefined, context);
-    assert.deepEqual(next, {
-      result: 'foo',
-      block: undefined
-    })
   });
 
-  it('should execute a listener with context and argument', function () {
-    var context = {a: 2};
-    var listener = new Listen(function (response, context) {
-      assert.strictEqual(response, 'hello world');
-      assert.deepEqual(context, {a: 2});
-      return 'foo'
+  it('should execute a listener with delay in receiving a message', function () {
+    var listener = new Listen();
+
+    var conversation = new Conversation();
+    setTimeout(function () {
+      conversation.deliver({message: 'foo'});
+    }, 10);
+
+    return listener.execute(conversation).then(function(next) {
+      assert.deepEqual(next, {
+        result: 'foo',
+        block: undefined
+      })
     });
-
-    var next = listener.execute('hello world', context);
-    assert.deepEqual(next, {
-      result: 'foo',
-      block: undefined
-    })
   });
 
   it('should execute a listener with next block', function () {
-    var listener = new Listen(function () {return 'foo'});
-    var nextListener = new Listen (function () {return 'foo'});
+    var listener = new Listen();
+    var nextListener = new Listen ();
     listener.then(nextListener);
 
-    var next = listener.execute();
-    assert.strictEqual(next.result, 'foo');
-    assert.strictEqual(next.block, nextListener);
+
+    var conversation = new Conversation();
+    conversation.deliver({message: 'foo'});
+
+    return listener.execute(conversation).then(function(next) {
+      assert.strictEqual(next.result, 'foo');
+      assert.strictEqual(next.block, nextListener);
+    });
   });
 
-  it('should pass the result from and to callback when executing', function () {
-    var action = new Listen(function (response, context) {
-      assert.equal(response, 'in');
-      return 'out';
+  it('should create a listen+iif block from function .listen', function () {
+    var block = new Block();
+    var callback = function (message) {
+      return message + 'bar';
+    };
+    var listen = block.listen(callback);
+
+    assert(block.next instanceof Listen);
+    assert(listen.next.next instanceof Then);
+
+    var conversation = new Conversation();
+    conversation.deliver({message: 'foo'});
+
+    return block.next.execute(conversation).then(function(next) {
+      assert(next.block instanceof Then);
+      assert.strictEqual(next.result, 'foo');
+
+      return next.block.execute(conversation, next.result);
+    }).then(function(next) {
+      assert.equal(next.block, null);
+      assert.strictEqual(next.result, 'foobar');
     });
-
-    var next = action.execute('in');
-    assert.strictEqual(next.result, 'out');
-    assert.strictEqual(next.block, undefined);
   });
 
 });

test/block/Tell.test.js

 var assert = require('assert');
+var Promise = require('es6-promise').Promise;
+var Conversation = require('../../lib/Conversation');
 var Tell = require('../../lib/block/Tell');
@@ -6,2 +8,12 @@
 
+  var sent = [];
+  var send = function (from, message) {
+    sent.push([from, message]);
+    return Promise.resolve();
+  };
+
+  beforeEach(function () {
+    sent = [];
+  });
+
   it('should create a tell', function () {
@@ -17,21 +29,71 @@ var tell1 = new Tell();
     assert.throws(function () { Tell(function () {}) }, SyntaxError);
-    assert.throws(function () { new Tell('hello')}, TypeError);
   });
 
-  it('should execute a tell without arguments', function () {
+  it('should execute a tell with static message', function () {
+    var tell = new Tell('foo');
+
+    var conversation = new Conversation({
+      id: 1,
+      self: 'peer1',
+      other: 'peer2',
+      send: send
+    });
+    return tell.execute(conversation).then(function(next) {
+      assert.deepEqual(next, {
+        result: 'foo',
+        block: undefined
+      });
+      assert.deepEqual(sent, [['peer2', {id:1, from: 'peer1', to: 'peer2', message: 'foo'}]]);
+    });
+  });
+
+  it('should execute a tell with callback function', function () {
     var tell = new Tell(function (response, context) {
-      assert.strictEqual(response, undefined);
-      assert.strictEqual(context, undefined);
+      assert.strictEqual(response, 'bar');
+      assert.strictEqual(context, conversation.context);
       return 'foo';
     });
 
-    var next = tell.execute();
-    assert.deepEqual(next, {
-      result: 'foo',
-      block: undefined
-    })
+    var conversation = new Conversation({
+      id: 1,
+      self: 'peer1',
+      other: 'peer2',
+      send: send
+    });
+    return tell.execute(conversation, 'bar').then(function(next) {
+      assert.deepEqual(next, {
+        result: 'foo',
+        block: undefined
+      });
+      assert.deepEqual(sent, [['peer2', {id:1, from: 'peer1', to: 'peer2', message: 'foo'}]]);
+    });
   });
 
+  it('should execute a tell with callback function returning a Promise', function () {
+    var tell = new Tell(function (response, context) {
+      assert.strictEqual(response, undefined);
+      assert.strictEqual(context, conversation.context);
+      return new Promise(function (resolve, reject) {
+        setTimeout(function () {
+          resolve('foo');
+        }, 10)
+      });
+    });
+
+    var conversation = new Conversation({
+      id: 1,
+      self: 'peer1',
+      other: 'peer2',
+      send: send
+    });
+    return tell.execute(conversation).then(function(next) {
+      assert.deepEqual(next, {
+        result: 'foo',
+        block: undefined
+      });
+      assert.deepEqual(sent, [['peer2', {id:1, from: 'peer1', to: 'peer2', message: 'foo'}]]);
+    });
+  });
+
   it('should execute a tell with context', function () {
-    var context = {a: 2};
     var tell = new Tell(function (response, context) {
@@ -43,11 +105,19 @@ assert.strictEqual(response, undefined);
 
-    var next = tell.execute(undefined, context);
-    assert.deepEqual(next, {
-      result: 'foo',
-      block: undefined
-    })
+    var conversation = new Conversation({
+      id: 1,
+      self: 'peer1',
+      other: 'peer2',
+      send: send,
+      context: {a: 2}
+    });
+    return tell.execute(conversation, undefined).then(function(next) {
+      assert.deepEqual(next, {
+        result: 'foo',
+        block: undefined
+      });
+      assert.deepEqual(sent, [['peer2', {id:1, from: 'peer1', to: 'peer2', message: 'foo'}]]);
+    });
   });
 
   it('should execute a tell with context and argument', function () {
-    var context = {a: 2};
     var tell = new Tell(function (response, context) {
@@ -59,7 +129,16 @@ assert.strictEqual(response, 'hello world');
 
-    var next = tell.execute('hello world', context);
-    assert.deepEqual(next, {
-      result: 'foo',
-      block: undefined
-    })
+    var conversation = new Conversation({
+      id: 1,
+      self: 'peer1',
+      other: 'peer2',
+      send: send,
+      context: {a: 2}
+    });
+    return tell.execute(conversation, 'hello world').then(function(next) {
+      assert.deepEqual(next, {
+        result: 'foo',
+        block: undefined
+      });
+      assert.deepEqual(sent, [['peer2', {id:1, from: 'peer1', to: 'peer2', message: 'foo'}]]);
+    });
   });
@@ -72,7 +151,41 @@
 
-    var next = tell.execute();
-    assert.strictEqual(next.result, 'foo');
-    assert.strictEqual(next.block, nextTell);
+    var conversation = new Conversation({
+      id: 1,
+      self: 'peer1',
+      other: 'peer2',
+      send: send
+    });
+    return tell.execute(conversation).then(function(next) {
+      assert.strictEqual(next.result, 'foo');
+      assert.strictEqual(next.block, nextTell);
+
+      assert.deepEqual(sent, [['peer2', {id:1, from: 'peer1', to: 'peer2', message: 'foo'}]]);
+    });
   });
 
+  it('should execute a tell with an async send method', function () {
+    var action = new Tell('foo');
+
+    var conversation = new Conversation({
+      id: 1,
+      self: 'peer1',
+      other: 'peer2',
+      send: function (from, message) {
+        return new Promise(function (resolve, reject) {
+          setTimeout(function () {
+            sent.push([from, message]);
+            resolve();
+          }, 10);
+        });
+      }
+    });
+
+    return action.execute(conversation, 'in').then(function(next) {
+      assert.strictEqual(next.result, 'foo');
+      assert.strictEqual(next.block, undefined);
+
+      assert.deepEqual(sent, [['peer2', {id:1, from: 'peer1', to: 'peer2', message: 'foo'}]]);
+    });
+  });
+
   it('should pass the result from and to callback when executing', function () {
@@ -84,7 +197,16 @@ var action = new Tell(function (response, context) {
 
-    var next = action.execute('in');
-    assert.strictEqual(next.result, 'out');
-    assert.strictEqual(next.block, undefined);
+    var conversation = new Conversation({
+      id: 1,
+      self: 'peer1',
+      other: 'peer2',
+      send: send
+    });
+    return action.execute(conversation, 'in').then(function(next) {
+      assert.strictEqual(next.result, 'out');
+      assert.strictEqual(next.block, undefined);
+
+      assert.deepEqual(sent, [['peer2', {id:1, from: 'peer1', to: 'peer2', message: 'out'}]]);
+    });
   });
 
 });

test/block/Then.test.js

 var assert = require('assert');
+var Conversation = require('../../lib/Conversation');
 var Then = require('../../lib/block/Then');
@@ -17,17 +18,21 @@
 
-  it('should execute a Then block without arguments', function () {
+  it('should execute a Then block without message', function () {
     var action = new Then(function (response, context) {
       assert.strictEqual(response, undefined);
-      assert.strictEqual(context, undefined);
+      assert.strictEqual(context, conversation.context);
     });
 
-    var next = action.execute();
-    assert.deepEqual(next, {
-      result: undefined,
-      block: undefined
-    })
+    var conversation = new Conversation();
+    return action.execute(conversation).then(function(next) {
+      assert.deepEqual(next, {
+        result: undefined,
+        block: undefined
+      })
+    });
   });
 
   it('should execute a Then block with context', function () {
-    var context = {a: 2};
+    var conversation = new Conversation({
+      context: {a: 2}
+    });
     var action = new Then(function (response, context) {
@@ -38,11 +43,14 @@ assert.strictEqual(response, undefined);
 
-    var next = action.execute(undefined, context);
-    assert.deepEqual(next, {
-      result: undefined,
-      block: undefined
-    })
+    return action.execute(conversation, undefined).then(function(next) {
+      assert.deepEqual(next, {
+        result: undefined,
+        block: undefined
+      })
+    });
   });
 
   it('should execute a Then block with context and argument', function () {
-    var context = {a: 2};
+    var conversation = new Conversation({
+      context: {a: 2}
+    });
     var action = new Then(function (response, context) {
@@ -53,7 +61,8 @@ assert.strictEqual(response, 'hello world');
 
-    var next = action.execute('hello world', context);
-    assert.deepEqual(next, {
-      result: undefined,
-      block: undefined
-    })
+    return action.execute(conversation, 'hello world').then(function(next) {
+      assert.deepEqual(next, {
+        result: undefined,
+        block: undefined
+      })
+    });
   });
@@ -66,5 +75,7 @@
 
-    var next = action.execute();
-    assert.strictEqual(next.result, undefined);
-    assert.strictEqual(next.block, nextThen);
+    var conversation = new Conversation();
+    return action.execute(conversation).then(function(next) {
+      assert.strictEqual(next.result, undefined);
+      assert.strictEqual(next.block, nextThen);
+    });
   });
@@ -78,7 +89,9 @@
 
-    var next = action.execute('in');
-    assert.strictEqual(next.result, 'out');
-    assert.strictEqual(next.block, undefined);
+    var conversation = new Conversation();
+    return action.execute(conversation, 'in').then(function(next) {
+      assert.strictEqual(next.result, 'out');
+      assert.strictEqual(next.block, undefined);
+    });
   });
 
 });

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Improved metrics

Total package byte prevSize

566721

increased by9.02%

Number of package files

46

increased by17.95%

Lines of code

7711

increased by15.95%

Number of lines in readme file

423

increased by10.44%

No dependency changes