# Copyright (c) 2011 Andrew Wilkins <axwalk@gmail.com>
# 
# Permission is hereby granted, free of charge, to any person
# obtaining a copy of this software and associated documentation
# files (the "Software"), to deal in the Software without
# restriction, including without limitation the rights to use,
# copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following
# conditions:
# 
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
# 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
# OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
# HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
# OTHER DEALINGS IN THE SOFTWARE.

def clone_function(func, globals=None):
    """
    Clone a function object by creating a new FunctionType with a cloned
    code object.
    """

    from types import CodeType, FunctionType
    co = func.func_code
    code = CodeType(
        co.co_argcount,
        co.co_nlocals,
        co.co_stacksize,
        co.co_flags,
        co.co_code,
        co.co_consts,
        co.co_names,
        co.co_varnames,
        co.co_filename,
        co.co_name,
        co.co_firstlineno,
        co.co_lnotab
    )

    import __builtin__
    if globals is None:
        globals = __builtin__.globals()
    return FunctionType(code, globals, func.func_name, func.func_defaults)