Added a Greek Preprocessor

chatterbot/preprocessors_greek.py

@@ -0,0 +1,18 @@
+"""
+Statement pre-processors for Greek language.
+"""
+def fix_final_sigma(statement):
+    '''
+    If there is a word that ends with "σ" it replaces it with "ς".
+    '''
+
+    data = statement.text.split()
+    text = ""
+
+    for word in data:
+        if word[-1]=="σ":
+            word = word[:-1] + "ς" 
+        text = text + word + " "
+    statement.text = text
+
+    return statement

tests/test_preprocessors_greek.py

@@ -0,0 +1,17 @@
+from tests.base_case import ChatBotTestCase
+from chatterbot.conversation import Statement
+from chatterbot import preprocessors_greek
+
+class PreprocessorFixFinalSigmaTestCase(ChatBotTestCase):
+    """
+    Make sure ChatterBot's final sigma replacing preprocessor works as expected.
+    """
+
+    def test_fix_final_sigma(self):
+        statement = Statement(text='Γεια σασ')
+
+        fixed = preprocessors_greek.fix_final_sigma(statement)
+        normalText = 'Γεια σας'
+        self.chatbot.preprocessors = [preprocessors.clean_whitespace]
+
+        self.assertEqual(fixed.text, normalText)