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ãb¸Ð”Å£Ã ?÷     import sys, types
from .lock import allocate_lock

try:
    callable
except NameError:
    # Python 3.1
    from collections import Callable
    callable = lambda x: isinstance(x, Callable)

try:
    basestring
except NameError:
    # Python 3.x
    basestring = str


class FFIError(Exception):
    pass

class CDefError(Exception):
    def __str__(self):
        try:
            line = 'line %d: ' % (self.args[1].coord.line,)
        except (AttributeError, TypeError, IndexError):
            line = ''
        return '%s%s' % (line, self.args[0])


class FFI(object):
    r'''
    The main top-level class that you instantiate once, or once per module.

    Example usage:

        ffi = FFI()
        ffi.cdef("""
            int printf(const char *, ...);
        """)

        C = ffi.dlopen(None)   # standard library
        -or-
        C = ffi.verify()  # use a C compiler: verify the decl above is right

        C.printf("hello, %s!\n", ffi.new("char[]", "world"))
    '''

    def __init__(self, backend=None):
        """Create an FFI instance.  The 'backend' argument is used to
        select a non-default backend, mostly for tests.
        """
        from . import cparser, model
        if backend is None:
            # You need PyPy (>= 2.0 beta), or a CPython (>= 2.6) with
            # _cffi_backend.so compiled.
            import _cffi_backend as backend
            from . import __version__
            assert backend.__version__ == __version__, \
               "version mismatch, %s != %s" % (backend.__version__, __version__)
            # (If you insist you can also try to pass the option
            # 'backend=backend_ctypes.CTypesBackend()', but don't
            # rely on it!  It's probably not going to work well.)

        self._backend = backend
        self._lock = allocate_lock()
        self._parser = cparser.Parser()
        self._cached_btypes = {}
        self._parsed_types = types.ModuleType('parsed_types').__dict__
        self._new_types = types.ModuleType('new_types').__dict__
        self._function_caches = []
        self._libraries = []
        self._cdefsources = []
        self._included_ffis = []
        self._windows_unicode = None
        self._init_once_cache = {}
        self._cdef_version = None
        self._embedding = None
        if hasattr(backend, 'set_ffi'):
            backend.set_ffi(self)
        for name in backend.__dict__:
            if name.startswith('RTLD_'):
                setattr(self, name, getattr(backend, name))
        #
        with self._lock:
            self.BVoidP = self._get_cached_btype(model.voidp_type)
            self.BCharA = self._get_cached_btype(model.char_array_type)
        if isinstance(backend, types.ModuleType):
            # _cffi_backend: attach these constants to the class
            if not hasattr(FFI, 'NULL'):
                FFI.NULL = self.cast(self.BVoidP, 0)
                FFI.CData, FFI.CType = backend._get_types()
        else:
            # ctypes backend: attach these constants to the instance
            self.NULL = self.cast(self.BVoidP, 0)
            self.CData, self.CType = backend._get_types()

    def cdef(self, csource, override=False, packed=False):
        """Parse the given C source.  This registers all declared functions,
        types, and global variables.  The functions and global variables can
        then be accessed via either 'ffi.dlopen()' or 'ffi.verify()'.
        The types can be used in 'ffi.new()' and other functions.
        If 'packed' is specified as True, all structs declared inside this
        cdef are packed, i.e. laid out without any field alignment at all.
        """
        self._cdef(csource, override=override, packed=packed)

    def embedding_api(self, csource, packed=False):
        self._cdef(csource, packed=packed, dllexport=True)
        if self._embedding is None:
            self._embedding = ''

    def _cdef(self, csource, override=False, **options):
        if not isinstance(csource, str):    # unico