dialogs/SFCStepNameDialog.py
author Andrey Skvortsov <andrej.skvortzov@gmail.com>
Fri, 10 Aug 2018 17:45:33 +0300
changeset 2278 a3ac46366b86
parent 1881 091005ec69c4
child 2423 2c7b7ae24d57
permissions -rw-r--r--
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():
<type 'exceptions.AttributeError'>:_'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.


from __future__ import absolute_import
import wx
from plcopen.structures import TestIdentifier, IEC_KEYWORDS

# -------------------------------------------------------------------------------
#                          Edit Step Name Dialog
# -------------------------------------------------------------------------------


class SFCStepNameDialog(wx.TextEntryDialog):

    def __init__(self, parent, message, caption="Please enter text", defaultValue="",
                 style=wx.OK | wx.CANCEL | wx.CENTRE, pos=wx.DefaultPosition):
        wx.TextEntryDialog.__init__(self, parent, message, caption, defaultValue, style, pos)

        self.PouNames = []
        self.Variables = []
        self.StepNames = []

        self.Bind(wx.EVT_BUTTON, self.OnOK,
                  self.GetSizer().GetItem(2).GetSizer().GetItem(1).GetSizer().GetAffirmativeButton())

    def OnOK(self, event):
        message = None
        step_name = self.GetSizer().GetItem(1).GetWindow().GetValue()
        if step_name == "":
            message = _("You must type a name!")
        elif not TestIdentifier(step_name):
            message = _("\"%s\" is not a valid identifier!") % step_name
        elif step_name.upper() in IEC_KEYWORDS:
            message = _("\"%s\" is a keyword. It can't be used!") % step_name
        elif step_name.upper() in self.PouNames:
            message = _("A POU named \"%s\" already exists!") % step_name
        elif step_name.upper() in self.Variables:
            message = _("A variable with \"%s\" as name already exists in this pou!") % step_name
        elif step_name.upper() in self.StepNames:
            message = _("\"%s\" step already exists!") % step_name
        if message is not None:
            dialog = wx.MessageDialog(self, message, _("Error"), wx.OK | wx.ICON_ERROR)
            dialog.ShowModal()
            dialog.Destroy()
        else:
            self.EndModal(wx.ID_OK)
        event.Skip()

    def SetPouNames(self, pou_names):
        self.PouNames = [pou_name.upper() for pou_name in pou_names]

    def SetVariables(self, variables):
        self.Variables = [var.Name.upper() for var in variables]

    def SetStepNames(self, step_names):
        self.StepNames = [step_name.upper() for step_name in step_names]