Support nullable types in mojom.

mojo/public/tools/bindings/pylib/mojom/generate/pack.py

 # Copyright 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import module as mojom
 
 # This module provides a mechanism for determining the packed order and offsets
 # of a mojom.Struct.
 #
 # ps = pack.PackedStruct(struct)
 # ps.packed_fields will access a list of PackedField objects, each of which
 # will have an offset, a size and a bit (for mojom.BOOLs).
 
 class PackedField(object):
   kind_to_size = {
-    mojom.BOOL:         1,
-    mojom.INT8:         1,
-    mojom.UINT8:        1,
-    mojom.INT16:        2,
-    mojom.UINT16:       2,
-    mojom.INT32:        4,
-    mojom.UINT32:       4,
-    mojom.FLOAT:        4,
-    mojom.HANDLE:       4,
-    mojom.MSGPIPE:      4,
-    mojom.SHAREDBUFFER: 4,
-    mojom.DCPIPE:       4,
-    mojom.DPPIPE:       4,
-    mojom.INT64:        8,
-    mojom.UINT64:       8,
-    mojom.DOUBLE:       8,
-    mojom.STRING:       8
+    mojom.BOOL:                  1,
+    mojom.INT8:                  1,
+    mojom.UINT8:                 1,
+    mojom.INT16:                 2,
+    mojom.UINT16:                2,
+    mojom.INT32:                 4,
+    mojom.UINT32:                4,
+    mojom.FLOAT:                 4,
+    mojom.HANDLE:                4,
+    mojom.MSGPIPE:               4,
+    mojom.SHAREDBUFFER:          4,
+    mojom.DCPIPE:                4,
+    mojom.DPPIPE:                4,
+    mojom.NULLABLE_HANDLE:       4,
+    mojom.NULLABLE_MSGPIPE:      4,
+    mojom.NULLABLE_SHAREDBUFFER: 4,
+    mojom.NULLABLE_DCPIPE:       4,
+    mojom.NULLABLE_DPPIPE:       4,
+    mojom.INT64:                 8,
+    mojom.UINT64:                8,
+    mojom.DOUBLE:                8,
+    mojom.STRING:                8,
+    mojom.NULLABLE_STRING:       8
   }
 
   @classmethod
   def GetSizeForKind(cls, kind):
     if isinstance(kind, (mojom.Array, mojom.Struct, mojom.FixedArray)):
       return 8
     if isinstance(kind, mojom.Interface) or \
        isinstance(kind, mojom.InterfaceRequest):
       kind = mojom.MSGPIPE
     if isinstance(kind, mojom.Enum):
@@ skipping 98 matching lines @@
     limit_of_previous_field = packed_field.offset + packed_field.size
 
   for i in xrange(limit_of_previous_field, len(bytes)):
     bytes[i].is_padding = True
 
   for byte in bytes:
     # A given byte cannot both be padding and have a fields packed into it.
     assert not (byte.is_padding and byte.packed_fields)
 
   return bytes