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# -*- coding: utf-8 -*-
#
# AWL simulator - datablocks
# Copyright 2012-2013 Michael Buesch <m@bues.ch>
#
# Licensed under the terms of the GNU General Public License version 2.
#
from util import *
from awloperators import *
from awldatatypes import *
from awlstruct import *
class DB(object):
def __init__(self, index, codeBlock=None):
self.index = index
self.codeBlock = codeBlock # The FB or FC, if this is an instance/bounce-DB.
if self.codeBlock:
# The data structure is declared by the interface.
self.__struct = None
else:
self.__struct = AwlStruct()
self.structInstance = None
@property
def struct(self):
if self.codeBlock:
return self.codeBlock.interface.struct
return self.__struct
def isInstanceDB(self):
return bool(self.codeBlock)
def allocate(self):
self.structInstance = AwlStructInstance(self.struct)
def fetch(self, operator):
return AwlOperator.fetchFromByteArray(self.structInstance.dataBytes,
operator)
def store(self, operator, value):
AwlOperator.storeToByteArray(self.structInstance.dataBytes,
operator, value)
def __repr__(self):
return "DB %d" % self.index
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