human
Complete this python program:
def analyse_buffer_options(globalpos, env, posargs, dictargs, defaults=None, need_complete=True):
assistant
#Here is the Python program you requested.

    """Must be called during type analysis, as analyse is called
    on the dtype argument.
    posargs and dictargs should consist of a list and a dict
    of tuples (value, pos). Defaults should be a dict of values.
    Returns a dict containing all the options a buffer can have and
    its value (with the positions stripped).
    """
    if (defaults is None):
        defaults = buffer_defaults
    (posargs, dictargs) = Interpreter.interpret_compiletime_options(posargs, dictargs, type_env=env, type_args=(0, 'dtype'))
    if (len(posargs) > buffer_positional_options_count):
        raise CompileError(posargs[(-1)][1], ERR_BUF_TOO_MANY)
    options = {}
    for (name, (value, pos)) in dictargs.items():
        if (not (name in buffer_options)):
            raise CompileError(pos, (ERR_BUF_OPTION_UNKNOWN % name))
        options[name] = value
    for (name, (value, pos)) in zip(buffer_options, posargs):
        if (not (name in buffer_options)):
            raise CompileError(pos, (ERR_BUF_OPTION_UNKNOWN % name))
        if (name in options):
            raise CompileError(pos, (ERR_BUF_DUP % name))
        options[name] = value
    for name in buffer_options:
        if (not (name in options)):
            try:
                options[name] = defaults[name]
            except KeyError:
                if need_complete:
                    raise CompileError(globalpos, (ERR_BUF_MISSING % name))
    dtype = options.get('dtype')
    if (dtype and dtype.is_extension_type):
        raise CompileError(globalpos, ERR_BUF_DTYPE)
    ndim = options.get('ndim')
    if (ndim and ((not isinstance(ndim, int)) or (ndim < 0))):
        raise CompileError(globalpos, ERR_BUF_NDIM)
    mode = options.get('mode')
    if (mode and (not (mode in ('full', 'strided', 'c', 'fortran')))):
        raise CompileError(globalpos, ERR_BUF_MODE)
    def assert_bool(name):
        x = options.get(name)
        if (not isinstance(x, bool)):
            raise CompileError(globalpos, (ERR_BUF_BOOL % name))
    assert_bool('negative_indices')
    assert_bool('cast')
    return options