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# -*- coding: utf-8 -*-
#
# AWL simulator - Hardware module loader
#
# Copyright 2013-2017 Michael Buesch <m@bues.ch>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
from __future__ import division, absolute_import, print_function, unicode_literals
#from awlsim.common.cython_support cimport * #@cy
from awlsim.common.compat import *
from awlsim.common.dynamic_import import *
from awlsim.common.util import *
from awlsim.common.exceptions import *
__all__ = [ "HwModLoader", ]
class HwModLoader(object):
"""Awlsim hardware module loader.
"""
# Tuple of built-in awlsim hardware modules.
builtinHwModules = (
"debug",
"dummy",
"linuxcnc",
"pixtend",
"pyprofibus",
"rpigpio",
)
def __init__(self, name, importName, mod):
self.name = name
self.importName = importName
self.mod = mod
@classmethod
def loadModule(cls, name):
"""Load a hardware module."""
# Module name sanity check
try:
if not name.strip():
raise ValueError
for c in name:
if not isalnum(c) and c != "_":
raise ValueError
except ValueError:
raise AwlSimError("Hardware module name '%s' "
"is invalid." % name)
# Create import name (add prefix)
importName = name
prefix = "awlsimhw_"
if importName.lower().startswith(prefix) and\
not importName.startswith(prefix):
raise AwlSimError("Hardware module name: '%s' "
"prefix of '%s' must be all-lower-case." %\
(prefix, name))
if not importName.startswith(prefix):
importName = prefix + importName
# Try to import the module
try:
mod = importModule(importName)
except ImportError as e:
raise AwlSimError("Failed to import hardware interface "
"module '%s' (import name '%s'): %s" %\
(name, importName, str(e)))
return cls(name, importName, mod)
def getInterface(self):
"""Get the HardwareInterface class."""
hwClassName = "HardwareInterface"
hwClass = getattr(self.mod, hwClassName, None)
if not hwClass:
raise AwlSimError("Hardware module '%s' (import name '%s') "
"does not have a '%s' class." %\
(self.name, self.importName, hwClassName))
return hwClass
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