def _get_type_and_quals()

in Lambda/Layer/crypto/python/lib/python3.8/site-packages/cffi/cparser.py [0:0]

• 79 lines of code
• 28 McCabe index (conditional complexity)

    def _get_type_and_quals(self, typenode, name=None, partial_length_ok=False,
                            typedef_example=None):
        # first, dereference typedefs, if we have it already parsed, we're good
        if (isinstance(typenode, pycparser.c_ast.TypeDecl) and
            isinstance(typenode.type, pycparser.c_ast.IdentifierType) and
            len(typenode.type.names) == 1 and
            ('typedef ' + typenode.type.names[0]) in self._declarations):
            tp, quals = self._declarations['typedef ' + typenode.type.names[0]]
            quals |= self._extract_quals(typenode)
            return tp, quals
        #
        if isinstance(typenode, pycparser.c_ast.ArrayDecl):
            # array type
            if typenode.dim is None:
                length = None
            else:
                length = self._parse_constant(
                    typenode.dim, partial_length_ok=partial_length_ok)
            # a hack: in 'typedef int foo_t[...][...];', don't use '...' as
            # the length but use directly the C expression that would be
            # generated by recompiler.py.  This lets the typedef be used in
            # many more places within recompiler.py
            if typedef_example is not None:
                if length == '...':
                    length = '_cffi_array_len(%s)' % (typedef_example,)
                typedef_example = "*" + typedef_example
            #
            tp, quals = self._get_type_and_quals(typenode.type,
                                partial_length_ok=partial_length_ok,
                                typedef_example=typedef_example)
            return model.ArrayType(tp, length), quals
        #
        if isinstance(typenode, pycparser.c_ast.PtrDecl):
            # pointer type
            itemtype, itemquals = self._get_type_and_quals(typenode.type)
            tp = self._get_type_pointer(itemtype, itemquals, declname=name)
            quals = self._extract_quals(typenode)
            return tp, quals
        #
        if isinstance(typenode, pycparser.c_ast.TypeDecl):
            quals = self._extract_quals(typenode)
            type = typenode.type
            if isinstance(type, pycparser.c_ast.IdentifierType):
                # assume a primitive type.  get it from .names, but reduce
                # synonyms to a single chosen combination
                names = list(type.names)
                if names != ['signed', 'char']:    # keep this unmodified
                    prefixes = {}
                    while names:
                        name = names[0]
                        if name in ('short', 'long', 'signed', 'unsigned'):
                            prefixes[name] = prefixes.get(name, 0) + 1
                            del names[0]
                        else:
                            break
                    # ignore the 'signed' prefix below, and reorder the others
                    newnames = []
                    for prefix in ('unsigned', 'short', 'long'):
                        for i in range(prefixes.get(prefix, 0)):
                            newnames.append(prefix)
                    if not names:
                        names = ['int']    # implicitly
                    if names == ['int']:   # but kill it if 'short' or 'long'
                        if 'short' in prefixes or 'long' in prefixes:
                            names = []
                    names = newnames + names
                ident = ' '.join(names)
                if ident == 'void':
                    return model.void_type, quals
                if ident == '__dotdotdot__':
                    raise FFIError(':%d: bad usage of "..."' %
                            typenode.coord.line)
                tp0, quals0 = resolve_common_type(self, ident)
                return tp0, (quals | quals0)
            #
            if isinstance(type, pycparser.c_ast.Struct):
                # 'struct foobar'
                tp = self._get_struct_union_enum_type('struct', type, name)
                return tp, quals
            #
            if isinstance(type, pycparser.c_ast.Union):
                # 'union foobar'
                tp = self._get_struct_union_enum_type('union', type, name)
                return tp, quals
            #
            if isinstance(type, pycparser.c_ast.Enum):
                # 'enum foobar'
                tp = self._get_struct_union_enum_type('enum', type, name)
                return tp, quals
        #
        if isinstance(typenode, pycparser.c_ast.FuncDecl):
            # a function type
            return self._parse_function_type(typenode, name), 0
        #
        # nested anonymous structs or unions end up here
        if isinstance(typenode, pycparser.c_ast.Struct):
            return self._get_struct_union_enum_type('struct', typenode, name,
                                                    nested=True), 0
        if isinstance(typenode, pycparser.c_ast.Union):
            return self._get_struct_union_enum_type('union', typenode, name,
                                                    nested=True), 0
        #
        raise FFIError(":%d: bad or unsupported type declaration" %
                typenode.coord.line)