4:67
  #   €l–Я=їJ*C]Љq@‚аEp SЌяї„Ћ2ПГВ ?ч     #
# DEPRECATED: implementation for ffi.verify()
#
import sys, os
import types

from . import model, ffiplatform


class VGenericEngine(object):
    _class_key = 'g'
    _gen_python_module = False

    def __init__(self, verifier):
        self.verifier = verifier
        self.ffi = verifier.ffi
        self.export_symbols = []
        self._struct_pending_verification = {}

    def patch_extension_kwds(self, kwds):
        # add 'export_symbols' to the dictionary.  Note that we add the
        # list before filling it.  When we fill it, it will thus also show
        # up in kwds['export_symbols'].
        kwds.setdefault('export_symbols', self.export_symbols)

    def find_module(self, module_name, path, so_suffixes):
        for so_suffix in so_suffixes:
            basename = module_name + so_suffix
            if path is None:
                path = sys.path
            for dirname in path:
                filename = os.path.join(dirname, basename)
                if os.path.isfile(filename):
                    return filename

    def collect_types(self):
        pass      # not needed in the generic engine

    def _prnt(self, what=''):
        self._f.write(what + '\n')

    def write_source_to_f(self):
        prnt = self._prnt
        # first paste some standard set of lines that are mostly '#include'
        prnt(cffimod_header)
        # then paste the C source given by the user, verbatim.
        prnt(self.verifier.preamble)
        #
        # call generate_gen_xxx_decl(), for every xxx found from
        # ffi._parser._declarations.  This generates all the functions.
        self._generate('decl')
        #
        # on Windows, distutils insists on putting init_cffi_xyz in
        # 'export_symbols', so instead of fighting it, just give up and
        # give it one
        if sys.platform == 'win32':
            if sys.version_info >= (3,):
                prefix = 'PyInit_'
            else:
                prefix = 'init'
            modname = self.verifier.get_module_name()
            prnt("void %s%s(void) { }\n" % (prefix, modname))

    def load_library(self, flags=0):
        # import it with the CFFI backend
        backend = self.ffi._backend
        # needs to make a path that contains '/', on Posix
        filename = os.path.join(os.curdir, self.verifier.modulefilename)
        module = backend.load_library(filename, flags)
        #
        # call loading_gen_struct() to get the struct layout inferred by
        # the C compiler
        self._load(module, 'loading')

        # build the FFILibrary class and instance, this is a module subclass
        # because modules are expected to have usually-constant-attributes and
        # in PyPy this means the JIT is able to treat attributes as constant,
        # which we want.
        class FFILibrary(types.ModuleType):
            _cffi_generic_module = module
            _cffi_ffi = self.ffi
            _cffi_dir = []
            def __dir__(self):
                return FFILibrary._cffi_dir
        library = FFILibrary("")
        #
        # finally, call the loaded_gen_xxx() functions.  This will set
        # up the 'library' object.
        self._load(module, 'loaded', library=library)
        return library

    def _get_declarations(self):
        lst = [(key, tp) for (key, (tp, qual)) in
                                self.ffi._parser._declarations.items()]
        lst.sort()
        return lst

    def _generate(self, step_name):
        for name, tp in self._get_declarations():
            kind, realname = name.split(' ', 1)
            try:
                method = getattr(self, '_generate_gen_%s_%s' % (kind,
                                                                step_name))
            except AttributeError:
                raise ffiplatform.VerificationError(
                    "not implemented in verify(): %r" % name)
            try:
                method(tp, realname)
            except Exception as e:
                model.attach_exception_info(e, name)