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# -*- coding: utf-8 -*-
"""
pyvisa-sim.common
~~~~~~~~~~~~~~~~~
Common code.
:copyright: 2014 by PyVISA-sim Authors, see AUTHORS for more details.
:license: MIT, see LICENSE for more details.
"""
from __future__ import (division, unicode_literals, print_function,
absolute_import)
import logging
import sys
from pyvisa import logger
logger = logging.LoggerAdapter(logger, {'backend': 'py'})
class MockInterface(object):
def __init__(self, resource_name):
self.resource_name = resource_name
class NamedObject(object):
"""A class to construct named sentinels.
"""
def __init__(self, name):
self.name = name
def __repr__(self):
return '<%s>' % self.name
__str__ = __repr__
if sys.version >= '3':
def iter_bytes(data, mask=None, send_end=False):
if send_end and mask is None:
raise ValueError('send_end requires a valid mask.')
if mask is None:
for d in data[:]:
yield bytes([d])
else:
for d in data[:-1]:
yield bytes([d & ~mask])
if send_end:
yield bytes([data[-1] | ~mask])
else:
yield bytes([data[-1] & ~mask])
int_to_byte = lambda val: bytes([val])
last_int = lambda val: val[-1]
else:
def iter_bytes(data, mask=None, send_end=False):
if send_end and mask is None:
raise ValueError('send_end requires a valid mask.')
if mask is None:
for d in data[:]:
yield d
else:
for d in data[:-1]:
yield chr(ord(d) & ~mask)
if send_end:
yield chr(ord(data[-1]) | ~mask)
else:
yield chr(ord(data[-1]) & ~mask)
int_to_byte = chr
last_int = lambda val: ord(val[-1])
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