swigify.py

#!/usr/bin/env python
#
# (C) Copyright IBM Corp. 2006
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. This
# file and program are licensed under a BSD style license. See
# the Copying file included with the OpenHPI distribution for
# full licensing terms.
#
"""
Filter a given header file into a clean swig interface file

This script takes the name of a header file as argument, and
produces a clean interface file ready to be parsed by SWIG. The
output file will be sent to standard output.

This script does two things to clean a header file into a
SWIG-ready interface file:
1. Eliminate the gcc __attribute__* directives. These confuse
   SWIG (at version 1.3.29).
2. Convert typecasted #define-s to const globals. Typecasted
   #define-s get dropped by SWIG (at version 1.3.29).
3. Remove #warning lines.

You won't need to call this script often at all. Only if the
header file for which you are creating a swig interface changes,
then this script will help you to quickly create a new swig
interface file for it.
"""
__author__ = 'Renier Morales <renierm@users.sf.net>'

import sys, re

for arg in sys.argv[1:]:
    header_file = open(sys.argv[1], 'r')
    header_content = header_file.read()
    header_file.close()

    # Eliminage __attribute__* directives
    header_content = re.sub(r' __attribute__\(.+\)([^()])', r'\1',header_content)
    # Convert typecasted defines to const globals
    header_content = re.sub(r'#define ([A-Z0-9_]+)[ \t\\\n]+\((\w+)\)[ ]*([-A-Za-z0-9_() +]+)', r'const \2 \1 = \3;', header_content)
    # Remove #warning preproccesor lines
    header_content = re.sub(r'^#warning .*', r'', header_content)

    print header_content