classes.py 文件源码

def Call_issubclass(t, x):
    """Translate ``issubclass(Foo, Bar)`` to ``Foo.prototype instanceof Bar``.
    """
    with switch(x):
        if ast.Call(func=ast.Name(id='issubclass'), args=[target, classes]):
            tproto = q[ast_literal[target].prototype]
            if isinstance(classes, (ast.Tuple, ast.List, ast.Set)):
                classes = classes.elts
            else:
                classes = [classes]
            prev = None
            for c in classes:
                cur = q[ast_literal[c].prototype.isPrototypeOf(
                    ast_literal[tproto])]
                if prev is not None:
                    cur = q[ast_literal[prev] or ast_literal[cur]]
                prev = cur
            return JSExpressionStatement(cur)