etherlab/entries_list.ysl2
author Andrey Skvortsov <andrej.skvortzov@gmail.com>
Fri, 24 Aug 2018 13:41:43 +0300
changeset 2297 96ca6b056c55
parent 2165 02a2b5dee5e3
child 2641 c9deff128c37
permissions -rw-r--r--
Proper 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


Revert commit "Dirty fix for error '_object_has_no_attribute_'getSlave' in EtherCAT extension"
[a3ac46366b86a0b237dac93be6b2281ac70b98a8].

The problem was that XML elements (proxy object) in some cases were created using custom XML
classes constructors and lxml.etree.Element() call and live python
patching. This causes that lxml backend doesn't know that custom python class
should be used for these XML elements.
Proxy object can be move/deleted and recreated by lxml
backend at any point in time or this can be done in python by copy/deepcopy operations.
If this happens, then newly created
proxy elements are using default class lxml.etree._Element. And all
custom functionality is lost.

All created XML elements should be always created through corresponding
parser and class lookup callback done by lxml backend.
It's described in more details in lxml documentation:
https://lxml.de/element_classes.html
2165
02a2b5dee5e3 Merged GPL + LGPL v2 or later EtherCAT extension. Fixed headers and copyright notice.
Edouard Tisserant <edouard.tisserant@gmail.com>
parents: 2162
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/*
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02a2b5dee5e3 Merged GPL + LGPL v2 or later EtherCAT extension. Fixed headers and copyright notice.
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Stylesheet used to list EtherCat dictionnary entries.
02a2b5dee5e3 Merged GPL + LGPL v2 or later EtherCAT extension. Fixed headers and copyright notice.
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02a2b5dee5e3 Merged GPL + LGPL v2 or later EtherCAT extension. Fixed headers and copyright notice.
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Copyright (C) 2011-2014: Laurent BESSARD
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02a2b5dee5e3 Merged GPL + LGPL v2 or later EtherCAT extension. Fixed headers and copyright notice.
Edouard Tisserant <edouard.tisserant@gmail.com>
parents: 2162
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Distributed under the terms of the GNU Lesser General Public License as
02a2b5dee5e3 Merged GPL + LGPL v2 or later EtherCAT extension. Fixed headers and copyright notice.
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parents: 2162
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published by the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
02a2b5dee5e3 Merged GPL + LGPL v2 or later EtherCAT extension. Fixed headers and copyright notice.
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parents: 2162
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02a2b5dee5e3 Merged GPL + LGPL v2 or later EtherCAT extension. Fixed headers and copyright notice.
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parents: 2162
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See COPYING file for copyrights details.
02a2b5dee5e3 Merged GPL + LGPL v2 or later EtherCAT extension. Fixed headers and copyright notice.
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parents: 2162
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02a2b5dee5e3 Merged GPL + LGPL v2 or later EtherCAT extension. Fixed headers and copyright notice.
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parents: 2162
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*/
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include yslt.yml2
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estylesheet xmlns:ns="entries_list_ns" 
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            extension-element-prefixes="ns" 
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            exclude-result-prefixes="ns" {
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    param "min_index";
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    param "max_index";
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    template "text()";
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    template "Device" {
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        apply "Profile/Dictionary/Objects/Object";
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        foreach "RxPdo" {
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            call "pdo_entries" with "direction", "'Receive'";
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        }
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        foreach "TxPdo" {
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            call "pdo_entries" with "direction", "'Transmit'";
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        }
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    }
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    template "Object" {
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        variable "index" > «ns:HexDecValue(Index/text())»
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        variable "entry_name" > «ns:EntryName(Name)»
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        choose {
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            when "$index >= $min_index and $index <= $max_index" {
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                variable "datatype_name" > «Type/text()»
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                choose {
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                    when "ancestor::Dictionary/child::DataTypes/DataType[Name/text()=$datatype_name][SubItem]" {
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                        apply "ancestor::Dictionary/child::DataTypes/DataType[Name/text()=$datatype_name][SubItem]" {
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                            with "index" > «$index»
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                            with "entry_name" > «$entry_name»
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                        }
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                    }
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                    otherwise {
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                        variable "subindex" > 0
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                        variable "entry" {
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                            > «ns:AddEntry($index, $subindex, $entry_name, $datatype_name, BitSize/text(), Flags/Access/text(), Flags/PdoMapping/text())»
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                        }
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                    }
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                }
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            }
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        }
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    }
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    template "DataType" {
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        param "index";
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        param "entry_name";
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        foreach "SubItem" {
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            variable "subindex" > «ns:HexDecValue(SubIdx/text())»
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            variable "subentry_name" > «$entry_name» - «ns:EntryName(DisplayName, Name/text())»
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            variable "entry" {
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                > «ns:AddEntry($index, $subindex, $subentry_name, Type/text(), BitSize/text(), Flags/Access/text(), Flags/PdoMapping/text())»
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            }
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        }
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    }
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    function "pdo_entries" {
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        param "direction";
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        variable "pdo_index" > «ns:HexDecValue(Index/text())»
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        variable "pdo_name" > «ns:EntryName(Name)»
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        foreach "Entry" {
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            variable "index" > «ns:HexDecValue(Index/text())»
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            choose {
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                when "$index >= $min_index and $index <= $max_index" {
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                    variable "subindex" > «ns:HexDecValue(SubIndex/text())»
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                    variable "subentry_name" > «ns:EntryName(Name)»
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                    variable "access" {
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                        choose {
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                            when "$direction='Transmit'" > ro
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                            otherwise > wo
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                        }
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                    }
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                    variable "pdo_mapping" {
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                        choose {
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                            when "$direction='Transmit'" > T
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                            otherwise > R
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                        }
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                    }
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                    variable "entry" {
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                        > «ns:AddEntry($index, $subindex, $subentry_name, DataType/text(), BitLen/text(), $access, $pdo_mapping, $pdo_index, $pdo_name, $direction)»
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                    }
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                }
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            }
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        }
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    }
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}