beremiz

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

2018-08-10, Andrey Skvortsov
a3ac46366b86
file isExecutable
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
#
# 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.
# pylint: disable=old-style-class,undefined-variable
class button:
def __init__(self, parent, id, args):
self.parent = parent
self.id = id
self.back_elt = getSVGElementById(args.back_id)
self.sele_elt = getSVGElementById(args.sele_id)
self.toggle = args.toggle
self.active = args.active
if args.state != undefined:
self.state = args.state
else:
self.state = False
self.dragging = False
if self.toggle:
self.up = not self.state
else:
self.up = True
# Add event on each element of the button
if self.active:
self.back_elt.addEventListener("mouseup", self, False)
self.back_elt.addEventListener("mousedown", self, False)
self.back_elt.addEventListener("mouseover", self, False)
self.back_elt.addEventListener("mouseout", self, False)
self.sele_elt.addEventListener("mouseup", self, False)
self.sele_elt.addEventListener("mousedown", self, False)
self.sele_elt.addEventListener("mouseover", self, False)
self.sele_elt.addEventListener("mouseout", self, False)
blockSVGElementDrag(self.back_elt)
blockSVGElementDrag(self.sele_elt)
self.updateElements()
# method to display the current state of interface
def updateElements(self):
if self.up:
self.sele_elt.setAttribute("display", "none")
self.back_elt.removeAttribute("display")
else:
self.sele_elt.removeAttribute("display")
self.back_elt.setAttribute("display", "none")
def updateValues(self, values):
if values.state != self.state:
self.state = values.state
self.up = not self.state
if self.toggle:
updateAttr(self.id, 'state', self.state)
self.updateElements()
def handleEvent(self, evt):
# Quand le bouton de la souris est presse
if evt.type == "mousedown":
evt.stopPropagation()
setCurrentObject(self)
self.dragging = True
if self.toggle:
self.up = self.state
else:
self.up = False
self.state = True
updateAttr(self.id, 'state', self.state)
self.updateElements()
if isCurrentObject(self) and self.dragging:
# Quand le bouton est survole
if evt.type == "mouseover" and self.toggle:
self.up = self.state
self.updateElements()
# Quand le curseur quitte la zone du bouton
elif evt.type == "mouseout" and self.toggle:
self.up = not self.state
self.updateElements()
# Quand le bouton de la souris est relache
elif evt.type == "mouseup":
evt.stopPropagation()
if self.toggle and self.up == self.state:
self.state = not self.state
updateAttr(self.id, 'state', self.state)
elif not self.toggle:
self.up = True
self.state = False
updateAttr(self.id, 'state', self.state)
self.updateElements()
self.dragging = False
class textControl:
def __init__(self, parent, id, args):
self.parent = parent
self.id = id
self.back_elt = getSVGElementById(args.back_id)
if args.text != undefined:
self.text = args.text
else:
self.text = ""
self.updateElements()
def updateValues(self, values):
if values.text != self.value:
self.text = values.text
updateAttr(self.id, 'text', self.text)
self.updateElements()
def updateElements(self):
self.back_elt.firstChild.firstChild.textContent = self.text
def handleEvent(self, evt):
pass