division_support: record the status of each modification

my2to3/fixes/fix_division_support.py

@@ -8,15 +8,23 @@ from my2to3.trace import get_data
 from my2to3.util import add_future, data2types
 
 
-def analyze_types(types):
-  """Indicates whether the division described by `data` should be modified into
-  `//`, or should remain as `/`
-  """
-  if len(types) == 1:
-    dividend, divisor = types[0]
-    if dividend is divisor is int:
-      return True
-  return False
+# id is used to differentiate the divisions of the same line.
+insert_support = create_table("division_support", "filename", "lineno", "id", "status")
+
+
+def analyze_data(data):
+  try:
+    types = data2types(data)
+  except Exception as e:
+    # Probably, one type is not a builtins
+    return False, "unknown"
+  else:
+    if len(types) == 1:
+      dividend, divisor = types[0]
+      if dividend is divisor is int:
+        return True, "automatic"
+
+    return False, "manual"
 
 
 class FixDivisionSupport(BaseFix):
@@ -35,7 +43,9 @@ class FixDivisionSupport(BaseFix):
     if not data:
       return
 
-    if analyze_types(data2types(data)):
+    should_change, status = analyze_data(data)
+    insert_support(filename, lineno, id_, status)
+    if should_change:
       add_future(node, 'division')
       operator = Leaf(lib2to3.pgen2.token.DOUBLESLASH, "//")
     else: