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))
[-------------------------------------------------------------]
include yslt_noindent.yml2
istylesheet xmlns:ppx="http://www.plcopen.org/xml/tc6_0201"
xmlns:xhtml="http://www.w3.org/1999/xhtml"
xmlns:ns="beremiz"
extension-element-prefixes="ns"
exclude-result-prefixes="ns" {
param "tree";
template "text()";
variable "project", "ns:GetProject()";
variable "stdlib", "ns:GetStdLibs()";
variable "extensions", "ns:GetExtensions()";
variable "all_types", "($project | $stdlib | $extensions)/ppx:types";
template "ppx:configuration" {
apply "ppx:globalVars";
}
template "ppx:resource" {
apply "ppx:globalVars";
}
template "ppx:pou" {
apply "ppx:interface/*";
}
template "ppx:returnType" {
value "ns:AddTree()";
apply ".", mode="var_type";
}
function "variables_infos" {
param "var_class";
variable "var_option" {
choose {
when "@constant='true' or @constant='1'" > Constant
when "@retain='true' or @retain='1'" > Retain
when "@nonretain='true' or @nonretain='1'" > Non-Retain
}
}
foreach "ppx:variable" {
variable "initial_value" {
apply "ppx:initialValue";
}
variable "edit" {
choose {
when "$var_class='Global' or $var_class='External'" > true
otherwise {
apply "ppx:type", mode="var_edit";
}
}
}
value "ns:AddTree()";
apply "ppx:type", mode="var_type";
value "ns:AddVariable(@name, $var_class, $var_option, @address, $initial_value, $edit, ppx:documentation/xhtml:p/text())";
}
}
template "ppx:localVars" {
call "variables_infos" {
with "var_class" > Local
}
}
template "ppx:globalVars" {
call "variables_infos" {
with "var_class" > Global
}
}
template "ppx:externalVars" {
call "variables_infos" {
with "var_class" > External
}
}
template "ppx:tempVars" {
call "variables_infos" {
with "var_class" > Temp
}
}
template "ppx:inputVars" {
call "variables_infos" {
with "var_class" > Input
}
}
template "ppx:outputVars" {
call "variables_infos" {
with "var_class" > Output
}
}
template "ppx:inOutVars" {
call "variables_infos" {
with "var_class" > InOut
}
}
template "ppx:pou", mode="var_type" {
apply "ppx:interface/*[self::ppx:inputVars or self::ppx:inOutVars or self::ppx:outputVars]/ppx:variable", mode="var_type";
}
template "ppx:variable", mode="var_type" {
variable "name" > «@name»
value "ns:AddTree()";
apply "ppx:type", mode="var_type";
value "ns:AddVarToTree($name)";
}
template "ppx:dataType", mode="var_type" {
apply "ppx:baseType", mode="var_type";
}
template "*[self::ppx:type or self::ppx:baseType or self::ppx:returnType]/ppx:struct", mode="var_type" {
apply "ppx:variable", mode="var_type";
}
template "*[self::ppx:type or self::ppx:baseType or self::ppx:returnType]/ppx:derived", mode="var_type" {
variable "type_name" > «@name»
choose {
when "$tree='True'" {
apply """$all_types/ppx:pous/ppx:pou[@name=$type_name] | \
$all_types/ppx:dataTypes/ppx:dataType[@name=$type_name]""", mode="var_type";
}
}
value "ns:SetType($type_name)";
}
template "*[self::ppx:type or self::ppx:baseType or self::ppx:returnType]/ppx:array", mode="var_type" {
apply "ppx:baseType", mode="var_type";
foreach "ppx:dimension" {
variable "lower" > «@lower»
variable "upper" > «@upper»
value "ns:AddDimension($lower, $upper)";
}
}
template "*[self::ppx:type or self::ppx:baseType or self::ppx:returnType]/ppx:string", mode="var_type" {
variable "name" > STRING
value "ns:SetType($name)";
}
template "*[self::ppx:type or self::ppx:baseType or self::ppx:returnType]/ppx:wstring", mode="var_type" {
variable "name" > WSTRING
value "ns:SetType($name)";
}
template "*[self::ppx:type or self::ppx:baseType or self::ppx:returnType]/*", mode="var_type" {
variable "name" > «local-name()»
value "ns:SetType($name)";
}
template "*[self::ppx:type or self::ppx:baseType or self::ppx:returnType]/ppx:derived", mode="var_edit" {
variable "type_name" > «@name»
variable "pou_infos", "$all_types/ppx:pous/ppx:pou[@name=$type_name]";
choose {
when "$pou_infos != ''" > false
otherwise > true
}
}
template "*[self::ppx:type or self::ppx:baseType or self::ppx:returnType]/*", mode="var_edit" {
> true
}
template "ppx:value" {
choose {
when "@repetitionValue" {
> «@repetitionValue»(
apply;
> )
}
when "@member" {
> «@member» :=
apply;
}
otherwise {
apply;
}
}
}
template "ppx:simpleValue" {
> «@value»
}
function "complex_type_value" {
param "start_bracket";
param "end_bracket";
> «$start_bracket»
foreach "ppx:value" {
apply ".";
choose {
when "position()!=last()" > ,
}
}
> «$end_bracket»
}
template "ppx:arrayValue" {
call "complex_type_value" {
with "start_bracket" > [
with "end_bracket" > ]
}
}
template "ppx:structValue" {
call "complex_type_value" {
with "start_bracket" > (
with "end_bracket" > )
}
}
}