# SPDX-License-Identifier: LGPL-3.0-or-later
# Copyright (C) 2020 Daniel Thompson

def const(fn):
    return fn

def native(fn):
    return fn

def viper(fn):
    def ptr8(buf):
        return buf

    def ptr16(buf):
        return memoryview(buf).cast('b').cast('H')

    def ptr32(buf):
        return memoryview(buf).cast('b').cast('I')

    # This is a bit of a hack since the scopes don't exactly match where
    # they would be in micropython but for the simple cases it does mean
    # no changes to the client
    fn.__globals__['ptr8'] = ptr8
    fn.__globals__['ptr16'] = ptr16
    fn.__globals__['ptr32'] = ptr32

    return fn