Added code to make slots optional

CHANGELOG.md

@@ -1,6 +1,6 @@
-### Next
+### 0.2.2
 
-* Your contribution here.
+* Added ability to make slots optional by adding "+" before and after slot name (example: {+SLOTNAME+|}) - [@dominicankev] (https://github.com/dominicankev).
 
 ### 0.2.1
 

README.md

@@ -134,6 +134,19 @@ You may want to work with [Custom Slot Types](https://developer.amazon.com/appsa
 "your least favorite snack is {Fruit}"
 ```
 
+You can use a special syntax to leave a curly-braced slot name unparsed and make it optional. For example, if you have defined in your skill a `ROOM_NAME` with the values `Bedroom`, `Office` and `Living Room` for the slot `Room_Name`, you can keep `Room_Name` a curly-braced literal and optional as follows
+
+```javascript
+"change channel {to|} {-|ChannelNumber} {in +ROOM_NAME+|+ROOM_NAME+|}"
+=>
+"change channel to {ChannelNumber} in {ROOM_NAME}"
+"change channel {ChannelNumber} in {ROOM_NAME}"
+"change channel to {ChannelNumber} {ROOM_NAME}"
+"change channel {ChannelNumber} {ROOM_NAME}"
+"change channel to {ChannelNumber} "
+"change channel {ChannelNumber} "
+```
+
 ### Contributing
 
 See [CONTRIBUTING](CONTRIBUTING.md)

index.js

@@ -157,6 +157,8 @@ function generateUtterances(str, slots, dictionary, exhaustiveUtterances) {
   // Convert all {-|Name} to {Name} to accomodate slot literals
   for (var idx in utterances) {
     utterances[idx] = utterances[idx].replace(/\{\-\|/g, "{");
+	utterances[idx] = utterances[idx].replace(/\+(.*?)/, "{");
+	utterances[idx] = utterances[idx].replace(/\+$/, "}");
   }
 
   return utterances;

test/index.js

@@ -111,15 +111,19 @@ test('exhaustive vs non-exhaustive expansion', function (t) {
 
 test('raw curly braces for custom slot types', function (t) {
   var dictionary = {};
-  var slots = {"Artist": "CUSTOM_TYPE"};
-  var template = "{my|your} {favorite|least favorite} fruit is {-|Fruit}";
+  var slots = {"Artist": "CUSTOM_TYPE","ROOM_NAME": "AMAZON.Room"};
+  var template = "{my|your} {favorite|least favorite} fruit is {-|Fruit} {in +ROOM_NAME+|}";
 
   var result = utterances(template, slots, dictionary);
   t.deepEqual(result, [
-    "my favorite fruit is {Fruit}",
-    "your favorite fruit is {Fruit}",
-    "my least favorite fruit is {Fruit}",
-    "your least favorite fruit is {Fruit}"
+    "my favorite fruit is {Fruit} in {ROOM_NAME}",
+    "your favorite fruit is {Fruit} in {ROOM_NAME}",
+	"my least favorite fruit is {Fruit} in {ROOM_NAME}",
+    "your least favorite fruit is {Fruit} in {ROOM_NAME}",
+	"my favorite fruit is {Fruit} ",
+	"your favorite fruit is {Fruit} ",
+	"my least favorite fruit is {Fruit} ",
+	"your least favorite fruit is {Fruit} "
   ]);
   t.end();
 });