Issue with backslashes again in the fast parser.

jedi/parser/fast.py

@@ -240,9 +240,10 @@ class FastParser(use_metaclass(CachedFastParser)):
 
     def update(self, source):
         # For testing purposes: It is important that the number of parsers used
-        # can be minimized. With this variable we can test it.
+        # can be minimized. With these variables we can test against that.
         self.number_parsers_used = 0
         self.number_of_splits = 0
+        self.number_of_misses = 0
         self.module.reset_caches()
         try:
             self._parse(source)
@@ -285,7 +286,10 @@ class FastParser(use_metaclass(CachedFastParser)):
         for i, l in enumerate(self._lines):
             # Handle backslash newline escaping.
             if l.endswith('\\\n') or l.endswith('\\\r\n'):
-                previous_line = l
+                if previous_line is not None:
+                    previous_line += l
+                else:
+                    previous_line = l
                 continue
             if previous_line is not None:
                 l = previous_line + l
@@ -371,6 +375,7 @@ class FastParser(use_metaclass(CachedFastParser)):
                 # Means that some lines where not fully parsed. Parse it now.
                 # This is a very rare case. Should only happens with very
                 # strange code bits.
+                self.number_of_misses += 1
                 while last_end_line < next_line_offset + 1:
                     line_offset = last_end_line - 1
                     # We could calculate the src in a more complicated way to
@@ -383,7 +388,7 @@ class FastParser(use_metaclass(CachedFastParser)):
                     last_end_line = self.current_node.parser.module.end_pos[0]
 
                 debug.dbg('While parsing %s, line %s slowed down the fast parser.',
-                          self.module_path, line_offset)
+                          self.module_path, line_offset + 1)
 
             line_offset = next_line_offset
             start += len(code_part)
@@ -501,7 +506,7 @@ class FastTokenizer(object):
         # Parentheses ignore the indentation rules. The other three stand for
         # new lines.
         if self.previous[0] in (NEWLINE, INDENT, DEDENT) \
-                and not self._parentheses_level and typ != INDENT:
+                and not self._parentheses_level and typ not in (INDENT, DEDENT):
             # Check for NEWLINE, which symbolizes the indent.
             if not self._in_flow:
                 if value in FLOWS:

jedi/parser/pgen2/parse.py

@@ -121,7 +121,7 @@ class PgenParser(object):
             ilabel = self.classify(type, value, start_pos)
         except ParseError:
             # Currently we ignore tokens like `?`.
-            print('invalid token', tokenize.tok_name[type], value)
+            print('invalid token', tokenize.tok_name[type], repr(value))
             return
 
         # Loop until the token is shifted; may raise exceptions

jedi/parser/tokenize.py

@@ -265,8 +265,8 @@ def generate_tokens(readline):
                             break
                 yield NAME, token, spos, prefix
             elif initial == '\\' and line[start:] == '\\\n':  # continued stmt
-                additional_prefix += line[start:]
+                additional_prefix += prefix + line[start:]
-                continue
+                break
             else:
                 if token in '([{':
                     paren_level += 1

test/test_parser/test_fast_parser.py

@@ -76,7 +76,7 @@ def test_split_parts():
     test('a\n', 'def b():\n pass\n', 'c\n')
 
 
-def check_fp(src, number_parsers_used, number_of_splits=None):
+def check_fp(src, number_parsers_used, number_of_splits=None, number_of_misses=0):
     if number_of_splits is None:
         number_of_splits = number_parsers_used
 
@@ -88,6 +88,7 @@ def check_fp(src, number_parsers_used, number_of_splits=None):
     assert src == p.module.get_code()
     assert p.number_of_splits == number_of_splits
     assert p.number_parsers_used == number_parsers_used
+    assert p.number_of_misses == number_of_misses
     return p.module
 
 
@@ -367,6 +368,18 @@ def test_backslash():
     # split.
     check_fp(src, 2)
 
+    src = dedent(r"""
+    def first():
+        if foo \
+                and bar \
+                or baz:
+            pass
+    def second():
+        pass
+    """)
+    check_fp(src, 2)
+
+
 
 def test_fake_parentheses():
     """
@@ -383,7 +396,7 @@ def test_fake_parentheses():
         def z():
             pass
     """)
-    check_fp(src, 3, 2)
+    check_fp(src, 3, 2, 1)
 
 
 def test_incomplete_function():