Add length checks for line lengths.

parso/python/normalizer.py

@@ -421,6 +421,13 @@ class PEP8Normalizer(Normalizer):
             self._check_spacing(leaf, spacing)
 
         self._analyse_non_prefix(leaf)
+        last_column = leaf.end_pos[1]
+        if last_column > self._config.max_characters:
+            self.add_issue(
+                501,
+                'Line too long (%s > %s characters)' % (last_column, self._config.max_characters),
+                leaf
+            )
 
         # -------------------------------
         # Finalizing. Updating the state.
@@ -622,6 +629,7 @@ class PEP8NormalizerConfig(NormalizerConfig):
         self.hanging_indentation = hanging_indentation
         self.closing_bracket_hanging_indentation = ''
         self.break_after_binary = False
+        self.max_characters = 79
 
 
 @PEP8NormalizerConfig.register_rule

test/normalizer_issue_files/utf-8.py

@@ -21,15 +21,15 @@
 # 情 情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情
 
 #
-#: E501
 # 80 narrow chars (Na)
+#: E501
 # 01 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6  [80]
 #
-#: E501
 # 78 narrow chars (Na) + 2 wide char (W)
+#: E501
 # 01 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8情情
 #
-#: E501
 # 3 narrow chars (Na) + 77 wide chars (W)
+#: E501
 # 情 情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情情
 #