Allow statements containing specific words to be excluded from respon…

…se results.

chatterbot/logic/best_match.py

@@ -58,7 +58,8 @@ def process(self, input_statement):
         # Get all statements that are in response to the closest match
         response_list = list(self.chatbot.storage.filter(
             search_in_response_to=closest_match.search_text,
-            exclude_text=recent_repeated_responses
+            exclude_text=recent_repeated_responses,
+            exclude_text_words=self.excluded_words
         ))
 
         if response_list:

chatterbot/logic/logic_adapter.py

@@ -40,6 +40,15 @@ def __init__(self, chatbot, **kwargs):
             'maximum_similarity_threshold', 0.95
         )
 
+        '''
+        The excluded_words parameter allows a list of words to be set that will
+        prevent the logic adapter from returning statements that have text
+        containing any of those words. This can be useful for preventing your
+        chat bot from saying swears when it is being demonstrated in front of
+        an audience.
+        '''
+        self.excluded_words = kwargs.get('excluded_words')
+
         # The maximum number of records to load into memory at a time when searching
         self.search_page_size = kwargs.get(
             'search_page_size', 1000

tests/logic/test_best_match.py

@@ -1,4 +1,3 @@
-from unittest.mock import MagicMock
 from chatterbot.logic import BestMatch
 from chatterbot.conversation import Statement
 from tests.base_case import ChatBotTestCase
@@ -17,11 +16,32 @@ def test_no_choices(self):
         """
         An exception should be raised if there is no data in the database.
         """
-        self.adapter.chatbot.storage.filter = MagicMock(return_value=[])
-        self.adapter.chatbot.storage.count = MagicMock(return_value=0)
-
         statement = Statement(text='What is your quest?')
         response = self.adapter.get(statement)
 
         self.assertEqual(response.text, 'What is your quest?')
         self.assertEqual(response.confidence, 0)
+
+    def test_excluded_words(self):
+        """
+        Test that the logic adapter cannot return a response containing
+        any of the listed words for exclusion.
+        """
+        self.chatbot.storage.create(
+            text='I like to count.'
+        )
+        self.chatbot.storage.create(
+            text='Counting is dumb.',
+            in_response_to='I like to count.'
+        )
+        self.chatbot.storage.create(
+            text='Counting is fun!',
+            in_response_to='I like to count.'
+        )
+
+        self.adapter.excluded_words = ['dumb']
+
+        response = self.adapter.process(Statement(text='I like to count.'))
+
+        self.assertEqual(response.confidence, 1)
+        self.assertEqual(response.text, 'Counting is fun!')