string prefixes are now recognized by the backwards tokenizer

jedi/parser/user_context.py

@@ -91,9 +91,12 @@ class UserContext(object):
             elif tok_str == '.':
                 force_point = False
             elif force_point:
-                # it is reversed, therefore a number is getting recognized
+                # Reversed tokenizing, therefore a number is recognized as a
-                # as a floating point number
+                # floating point number.
-                if tok_type == tokenize.NUMBER and tok_str[0] == '.':
+                # The same is true for string prefixes -> represented as a
+                # combination of string and name.
+                if tok_type == tokenize.NUMBER and tok_str[0] == '.' \
+                        or tok_type == tokenize.NAME and last_type == tokenize.STRING:
                     force_point = False
                 else:
                     break

test/test_evaluate/test_compiled.py

@@ -1,7 +1,8 @@
-from jedi._compatibility import builtins
+from jedi._compatibility import builtins, is_py3
 from jedi.parser.representation import Function
 from jedi.evaluate import compiled
 from jedi.evaluate import Evaluator
+from jedi import Script
 
 
 def test_simple():
@@ -47,3 +48,19 @@ def test_doc():
     """
     obj = compiled.CompiledObject(''.__getnewargs__)
     assert obj.doc == ''
+
+
+def test_string_literals():
+    def typ(string):
+        d = Script(string).goto_definitions()[0]
+        return d.name
+
+    assert typ('""') == 'str'
+    assert typ('r""') == 'str'
+    if is_py3:
+        assert typ('br""') == 'bytes'
+        assert typ('b""') == 'bytes'
+        assert typ('u""') == 'str'
+    else:
+        assert typ('b""') == 'string'
+        assert typ('u""') == 'unicode'