beremiz

Dirty fix for error '_object_has_no_attribute_'getSlave' in EtherCAT extension

2018-08-10, Andrey Skvortsov
a3ac46366b86
Dirty fix for error '_object_has_no_attribute_'getSlave' in EtherCAT extension

traceback:
File "/home/developer/WorkData/PLC/beremiz/beremiz/IDEFrame.py", line 1433, in OnPouSelectedChanged
window.RefreshView()
File "/home/developer/WorkData/PLC/beremiz/beremiz/etherlab/ConfigEditor.py", line 837, in RefreshView
self.RefreshProcessVariables()
File "/home/developer/WorkData/PLC/beremiz/beremiz/etherlab/ConfigEditor.py", line 886, in RefreshProcessVariables
slaves = self.Controler.GetSlaves(**self.CurrentNodesFilter)
File "/home/developer/WorkData/PLC/beremiz/beremiz/etherlab/EthercatMaster.py", line 341, in GetSlaves
for slave in self.Config.getConfig().getSlave():
:_'lxml.etree._Element'_object_has_no_attribute_'getSlave'

Steps to reproduce problem:

- Add new EtherCAT master
- Add new EthercatNode to the master
- double click on


this is looks like dirty hack to fix strange problem with initial[0]
changing its type after returning from _init_ method to lxml.etree._Element
As a result all methods generated by class factory are lost.

For example, in function initMethod initial[0].__class__ points to
xmlclass.xmlclass.Config. After map(self.append, initial)
self.Config.__class__ is 'xmlclass.xmlclass.Config' as well.
But after returning from initMethod (_init) in CreateElement
self.Config.__class__ has changed to lxml.etree._Element.


I've noticed similar behavior if copy/deepcopy is used for any child
of etree.ElementBase. See simple example below.
[-------------------------------------------------------------]
#!/usr/bin/python

from __future__ import print_function
from lxml import etree
import copy

class DefaultElementClass(etree.ElementBase):
def getLocalTag(self):
return etree.QName(self.tag).localname


def printInformation(x):
print(x, x.__class__, "getLocalTag" in dir(x))


a = DefaultElementClass()
printInformation(a)

#
printInformation(copy.copy(a))
printInformation(copy.deepcopy(a))
[-------------------------------------------------------------]
#!/usr/bin/env python
# -*- coding: utf-8 -*-
# This file is part of Beremiz, a Integrated Development Environment for
# programming IEC 61131-3 automates supporting plcopen standard and CanFestival.
#
# Copyright (C) 2007: Edouard TISSERANT and Laurent BESSARD
# Copyright (C) 2017: Andrey Skvortsov
#
# See COPYING file for copyrights details.
#
# 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 absolute_import
from os.path import join
import util.paths as paths
from util.TranslationCatalogs import NoTranslate
sd = paths.AbsDir(__file__)
# Override gettext _ in this module
# since we just want string to be added to dictionnary
# but translation should happen here
_ = NoTranslate
LANGUAGES = ["IL", "ST", "FBD", "LD", "SFC"]
LOCATIONDATATYPES = {"X": ["BOOL"],
"B": ["SINT", "USINT", "BYTE", "STRING"],
"W": ["INT", "UINT", "WORD", "WSTRING"],
"D": ["DINT", "UDINT", "REAL", "DWORD"],
"L": ["LINT", "ULINT", "LREAL", "LWORD"]}
# -------------------------------------------------------------------------------
# Function Block Types definitions
# -------------------------------------------------------------------------------
StdTC6Libs = [(_("Standard function blocks"), join(sd, "Standard_Function_Blocks.xml")),
(_("Additional function blocks"), join(sd, "Additional_Function_Blocks.xml"))]
StdFuncsCSV = join(sd, "iec_std.csv")
def GetBlockInfos(pou):
infos = pou.getblockInfos()
infos["inputs"] = [
(var_name, var_type, "rising")
if var_name in ["CU", "CD"]
else (var_name, var_type, var_modifier)
for var_name, var_type, var_modifier in infos["inputs"]]
return infos
# -------------------------------------------------------------------------------
# Data Types definitions
# -------------------------------------------------------------------------------
#: Ordored list of common data types defined in the IEC 61131-3
#: Each type is associated to his direct parent type. It defines then a hierarchy
#: between type that permits to make a comparison of two types
TypeHierarchy_list = [
("ANY", None),
("ANY_DERIVED", "ANY"),
("ANY_ELEMENTARY", "ANY"),
("ANY_MAGNITUDE", "ANY_ELEMENTARY"),
("ANY_BIT", "ANY_ELEMENTARY"),
("ANY_NBIT", "ANY_BIT"),
("ANY_STRING", "ANY_ELEMENTARY"),
("ANY_DATE", "ANY_ELEMENTARY"),
("ANY_NUM", "ANY_MAGNITUDE"),
("ANY_REAL", "ANY_NUM"),
("ANY_INT", "ANY_NUM"),
("ANY_SINT", "ANY_INT"),
("ANY_UINT", "ANY_INT"),
("BOOL", "ANY_BIT"),
("SINT", "ANY_SINT"),
("INT", "ANY_SINT"),
("DINT", "ANY_SINT"),
("LINT", "ANY_SINT"),
("USINT", "ANY_UINT"),
("UINT", "ANY_UINT"),
("UDINT", "ANY_UINT"),
("ULINT", "ANY_UINT"),
("REAL", "ANY_REAL"),
("LREAL", "ANY_REAL"),
("TIME", "ANY_MAGNITUDE"),
("DATE", "ANY_DATE"),
("TOD", "ANY_DATE"),
("DT", "ANY_DATE"),
("STRING", "ANY_STRING"),
("BYTE", "ANY_NBIT"),
("WORD", "ANY_NBIT"),
("DWORD", "ANY_NBIT"),
("LWORD", "ANY_NBIT")
# ("WSTRING", "ANY_STRING") # TODO
]
DefaultType = "DINT"
DataTypeRange_list = [
("SINT", (-2**7, 2**7 - 1)),
("INT", (-2**15, 2**15 - 1)),
("DINT", (-2**31, 2**31 - 1)),
("LINT", (-2**63, 2**63 - 1)),
("USINT", (0, 2**8 - 1)),
("UINT", (0, 2**16 - 1)),
("UDINT", (0, 2**32 - 1)),
("ULINT", (0, 2**64 - 1))
]
ANY_TO_ANY_FILTERS = {
"ANY_TO_ANY": [
# simple type conv are let as C cast
(("ANY_INT", "ANY_BIT"), ("ANY_NUM", "ANY_BIT")),
(("ANY_REAL",), ("ANY_REAL",)),
# REAL_TO_INT
(("ANY_REAL",), ("ANY_SINT",)),
(("ANY_REAL",), ("ANY_UINT",)),
(("ANY_REAL",), ("ANY_BIT",)),
# TO_TIME
(("ANY_INT", "ANY_BIT"), ("ANY_DATE", "TIME")),
(("ANY_REAL",), ("ANY_DATE", "TIME")),
(("ANY_STRING",), ("ANY_DATE", "TIME")),
# FROM_TIME
(("ANY_DATE", "TIME"), ("ANY_REAL",)),
(("ANY_DATE", "TIME"), ("ANY_INT", "ANY_NBIT")),
(("TIME",), ("ANY_STRING",)),
(("DATE",), ("ANY_STRING",)),
(("TOD",), ("ANY_STRING",)),
(("DT",), ("ANY_STRING",)),
# TO_STRING
(("BOOL",), ("ANY_STRING",)),
(("ANY_BIT",), ("ANY_STRING",)),
(("ANY_REAL",), ("ANY_STRING",)),
(("ANY_SINT",), ("ANY_STRING",)),
(("ANY_UINT",), ("ANY_STRING",)),
# FROM_STRING
(("ANY_STRING",), ("BOOL",)),
(("ANY_STRING",), ("ANY_BIT",)),
(("ANY_STRING",), ("ANY_SINT",)),
(("ANY_STRING",), ("ANY_UINT",)),
(("ANY_STRING",), ("ANY_REAL",))
],
"BCD_TO_ANY": [
(("BYTE",), ("USINT",)),
(("WORD",), ("UINT",)),
(("DWORD",), ("UDINT",)),
(("LWORD",), ("ULINT",))
],
"ANY_TO_BCD": [
(("USINT",), ("BYTE",)),
(("UINT",), ("WORD",)),
(("UDINT",), ("DWORD",)),
(("ULINT",), ("LWORD",))
]
}
# remove gettext override
del _