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))
[-------------------------------------------------------------]
<?xml version="1.0"?>
<xsl:stylesheet xmlns:exsl="http://exslt.org/common" xmlns:xhtml="http://www.w3.org/1999/xhtml" xmlns:ppx="http://www.plcopen.org/xml/tc6_0201" xmlns:ns="beremiz" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" extension-element-prefixes="ns" version="1.0" exclude-result-prefixes="ns">
<xsl:output method="xml"/>
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<xsl:template match="text()"/>
<xsl:variable name="project" select="ns:GetProject()"/>
<xsl:variable name="stdlib" select="ns:GetStdLibs()"/>
<xsl:variable name="extensions" select="ns:GetExtensions()"/>
<xsl:variable name="all_types" select="($project | $stdlib | $extensions)/ppx:types"/>
<xsl:template match="ppx:configuration">
<xsl:apply-templates select="ppx:globalVars"/>
</xsl:template>
<xsl:template match="ppx:resource">
<xsl:apply-templates select="ppx:globalVars"/>
</xsl:template>
<xsl:template match="ppx:pou">
<xsl:apply-templates select="ppx:interface/*"/>
</xsl:template>
<xsl:template match="ppx:returnType">
<xsl:value-of select="ns:AddTree()"/>
<xsl:apply-templates mode="var_type" select="."/>
</xsl:template>
<xsl:template name="variables_infos">
<xsl:param name="var_class"/>
<xsl:variable name="var_option">
<xsl:choose>
<xsl:when test="@constant='true' or @constant='1'">
<xsl:text>Constant</xsl:text>
</xsl:when>
<xsl:when test="@retain='true' or @retain='1'">
<xsl:text>Retain</xsl:text>
</xsl:when>
<xsl:when test="@nonretain='true' or @nonretain='1'">
<xsl:text>Non-Retain</xsl:text>
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<xsl:for-each select="ppx:variable">
<xsl:variable name="initial_value">
<xsl:apply-templates select="ppx:initialValue"/>
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<xsl:variable name="edit">
<xsl:choose>
<xsl:when test="$var_class='Global' or $var_class='External'">
<xsl:text>true</xsl:text>
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<xsl:otherwise>
<xsl:apply-templates mode="var_edit" select="ppx:type"/>
</xsl:otherwise>
</xsl:choose>
</xsl:variable>
<xsl:value-of select="ns:AddTree()"/>
<xsl:apply-templates mode="var_type" select="ppx:type"/>
<xsl:value-of select="ns:AddVariable(@name, $var_class, $var_option, @address, $initial_value, $edit, ppx:documentation/xhtml:p/text())"/>
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<xsl:template match="ppx:localVars">
<xsl:call-template name="variables_infos">
<xsl:with-param name="var_class">
<xsl:text>Local</xsl:text>
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<xsl:template match="ppx:globalVars">
<xsl:call-template name="variables_infos">
<xsl:with-param name="var_class">
<xsl:text>Global</xsl:text>
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</xsl:call-template>
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<xsl:template match="ppx:externalVars">
<xsl:call-template name="variables_infos">
<xsl:with-param name="var_class">
<xsl:text>External</xsl:text>
</xsl:with-param>
</xsl:call-template>
</xsl:template>
<xsl:template match="ppx:tempVars">
<xsl:call-template name="variables_infos">
<xsl:with-param name="var_class">
<xsl:text>Temp</xsl:text>
</xsl:with-param>
</xsl:call-template>
</xsl:template>
<xsl:template match="ppx:inputVars">
<xsl:call-template name="variables_infos">
<xsl:with-param name="var_class">
<xsl:text>Input</xsl:text>
</xsl:with-param>
</xsl:call-template>
</xsl:template>
<xsl:template match="ppx:outputVars">
<xsl:call-template name="variables_infos">
<xsl:with-param name="var_class">
<xsl:text>Output</xsl:text>
</xsl:with-param>
</xsl:call-template>
</xsl:template>
<xsl:template match="ppx:inOutVars">
<xsl:call-template name="variables_infos">
<xsl:with-param name="var_class">
<xsl:text>InOut</xsl:text>
</xsl:with-param>
</xsl:call-template>
</xsl:template>
<xsl:template mode="var_type" match="ppx:pou">
<xsl:apply-templates mode="var_type" select="ppx:interface/*[self::ppx:inputVars or self::ppx:inOutVars or self::ppx:outputVars]/ppx:variable"/>
</xsl:template>
<xsl:template mode="var_type" match="ppx:variable">
<xsl:variable name="name">
<xsl:value-of select="@name"/>
</xsl:variable>
<xsl:value-of select="ns:AddTree()"/>
<xsl:apply-templates mode="var_type" select="ppx:type"/>
<xsl:value-of select="ns:AddVarToTree($name)"/>
</xsl:template>
<xsl:template mode="var_type" match="ppx:dataType">
<xsl:apply-templates mode="var_type" select="ppx:baseType"/>
</xsl:template>
<xsl:template mode="var_type" match="*[self::ppx:type or self::ppx:baseType or self::ppx:returnType]/ppx:struct">
<xsl:apply-templates mode="var_type" select="ppx:variable"/>
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<xsl:template mode="var_type" match="*[self::ppx:type or self::ppx:baseType or self::ppx:returnType]/ppx:derived">
<xsl:variable name="type_name">
<xsl:value-of select="@name"/>
</xsl:variable>
<xsl:choose>
<xsl:when test="$tree='True'">
<xsl:apply-templates mode="var_type" select="$all_types/ppx:pous/ppx:pou[@name=$type_name] | $all_types/ppx:dataTypes/ppx:dataType[@name=$type_name]"/>
</xsl:when>
</xsl:choose>
<xsl:value-of select="ns:SetType($type_name)"/>
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<xsl:template mode="var_type" match="*[self::ppx:type or self::ppx:baseType or self::ppx:returnType]/ppx:array">
<xsl:apply-templates mode="var_type" select="ppx:baseType"/>
<xsl:for-each select="ppx:dimension">
<xsl:variable name="lower">
<xsl:value-of select="@lower"/>
</xsl:variable>
<xsl:variable name="upper">
<xsl:value-of select="@upper"/>
</xsl:variable>
<xsl:value-of select="ns:AddDimension($lower, $upper)"/>
</xsl:for-each>
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<xsl:template mode="var_type" match="*[self::ppx:type or self::ppx:baseType or self::ppx:returnType]/ppx:string">
<xsl:variable name="name">
<xsl:text>STRING</xsl:text>
</xsl:variable>
<xsl:value-of select="ns:SetType($name)"/>
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<xsl:template mode="var_type" match="*[self::ppx:type or self::ppx:baseType or self::ppx:returnType]/ppx:wstring">
<xsl:variable name="name">
<xsl:text>WSTRING</xsl:text>
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<xsl:value-of select="ns:SetType($name)"/>
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<xsl:template mode="var_type" match="*[self::ppx:type or self::ppx:baseType or self::ppx:returnType]/*">
<xsl:variable name="name">
<xsl:value-of select="local-name()"/>
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<xsl:value-of select="ns:SetType($name)"/>
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<xsl:template mode="var_edit" match="*[self::ppx:type or self::ppx:baseType or self::ppx:returnType]/ppx:derived">
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<xsl:text>false</xsl:text>
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<xsl:otherwise>
<xsl:text>true</xsl:text>
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<xsl:text>true</xsl:text>
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<xsl:when test="@repetitionValue">
<xsl:value-of select="@repetitionValue"/>
<xsl:text>(</xsl:text>
<xsl:apply-templates/>
<xsl:text>)</xsl:text>
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<xsl:when test="@member">
<xsl:value-of select="@member"/>
<xsl:text> := </xsl:text>
<xsl:apply-templates/>
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<xsl:apply-templates/>
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<xsl:template match="ppx:simpleValue">
<xsl:value-of select="@value"/>
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<xsl:template name="complex_type_value">
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<xsl:value-of select="$start_bracket"/>
<xsl:for-each select="ppx:value">
<xsl:apply-templates select="."/>
<xsl:choose>
<xsl:when test="position()!=last()">
<xsl:text>, </xsl:text>
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<xsl:value-of select="$end_bracket"/>
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<xsl:template match="ppx:arrayValue">
<xsl:call-template name="complex_type_value">
<xsl:with-param name="start_bracket">
<xsl:text>[</xsl:text>
</xsl:with-param>
<xsl:with-param name="end_bracket">
<xsl:text>]</xsl:text>
</xsl:with-param>
</xsl:call-template>
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<xsl:template match="ppx:structValue">
<xsl:call-template name="complex_type_value">
<xsl:with-param name="start_bracket">
<xsl:text>(</xsl:text>
</xsl:with-param>
<xsl:with-param name="end_bracket">
<xsl:text>)</xsl:text>
</xsl:with-param>
</xsl:call-template>
</xsl:template>
</xsl:stylesheet>