How to use the cffi.recompiler.Recompiler function in cffi

def check_type_table(input, expected_output, included=None):
    ffi = FFI()
    if included:
        ffi1 = FFI()
        ffi1.cdef(included)
        ffi.include(ffi1)
    ffi.cdef(input)
    recomp = recompiler.Recompiler(ffi, 'testmod')
    recomp.collect_type_table()
    assert ''.join(map(str, recomp.cffi_types)) == expected_output

def check_type_table(input, expected_output, included=None):
    ffi = FFI()
    if included:
        ffi1 = FFI()
        ffi1.cdef(included)
        ffi.include(ffi1)
    ffi.cdef(input)
    recomp = recompiler.Recompiler(ffi, 'testmod')
    recomp.collect_type_table()
    assert ''.join(map(str, recomp.cffi_types)) == expected_output

def check_type_table(input, expected_output, included=None):
    ffi = FFI()
    if included:
        ffi1 = FFI()
        ffi1.cdef(included)
        ffi.include(ffi1)
    ffi.cdef(input)
    recomp = recompiler.Recompiler(ffi, 'testmod')
    recomp.collect_type_table()
    assert ''.join(map(str, recomp.cffi_types)) == expected_output

def cffi(module_name, c_header):
  """Generates CFFI C source for given C header"""
  ffibuilder = FFI()
  # Use the header twice:-
  ffibuilder.cdef(c_header) # once for the declaration of exported code...

  recompiler = Recompiler(ffibuilder, module_name, target_is_python=False)
  recompiler.collect_type_table()
  recompiler.collect_step_tables()
  f = io.StringIO()
  # ... and once for the internal declaration.
  # In this case, "stdbool" needs to be added
  header = '#include "stdbool.h"\n' + c_header
  recompiler.write_source_to_f(f, header)
  return f.getvalue()