[PATCH v4 04/41] dissector: Decorate writer class to make easier ifdef/endif handling

[Frediano Ziglio <fziglio@xxxxxxxxxx>]

I'm generating code for dissector from demarshaller.
Make simple to hangle ifdef/endif not having to check manually attribute.

Signed-off-by: Frediano Ziglio <fziglio@xxxxxxxxxx>
---
 python_modules/dissector.py | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/python_modules/dissector.py b/python_modules/dissector.py
index 52234fc..e088cb6 100644
--- a/python_modules/dissector.py
+++ b/python_modules/dissector.py
@@ -2,6 +2,9 @@
 from . import codegen
 import re
 
+import sys
+import types
+
 
 # generate a new tree identifier
 ett_writer = None
@@ -95,10 +98,28 @@ def write_protocol_definitions(writer):
     writer.end_block()
 
 
+def decorate_writer(writer):
+    cls = writer.__class__
+
+    def create(old):
+        def ifdef(self, member):
+            if member.has_attr("ifdef"):
+                old(self, member.attributes["ifdef"][0])
+        if sys.version_info[0] == 2:
+            return types.MethodType(ifdef, None, cls)
+        return ifdef
+
+    cls.ifdef      = create(cls.ifdef)
+    cls.ifdef_else = create(cls.ifdef_else)
+    cls.endif      = create(cls.endif)
+
+
 def write_protocol_parser(writer, proto):
     global hf_writer
     global ett_writer
 
+    decorate_writer(writer)
+
     write_parser_helpers(writer)
 
     # put fields declaration first
-- 
2.1.0

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