plcopen/instance_tagname.xslt
author Andrey Skvortsov <andrej.skvortzov@gmail.com>
Fri, 24 Aug 2018 13:41:43 +0300
changeset 2297 96ca6b056c55
parent 1950 752ec68da94d
child 2637 507737ec2b9a
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
<?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"/>
  <xsl:param name="instance_path"/>
  <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 | $extensions)/ppx:types"/>
  <xsl:template name="element_name">
    <xsl:param name="path"/>
    <xsl:choose>
      <xsl:when test="contains($path,'.')">
        <xsl:value-of select="substring-before($path,'.')"/>
      </xsl:when>
      <xsl:otherwise>
        <xsl:value-of select="$path"/>
      </xsl:otherwise>
    </xsl:choose>
  </xsl:template>
  <xsl:template name="next_path">
    <xsl:param name="path"/>
    <xsl:choose>
      <xsl:when test="contains($path,'.')">
        <xsl:value-of select="substring-after($path,'.')"/>
      </xsl:when>
    </xsl:choose>
  </xsl:template>
  <xsl:template match="ppx:project">
    <xsl:variable name="config_name">
      <xsl:call-template name="element_name">
        <xsl:with-param name="path" select="$instance_path"/>
      </xsl:call-template>
    </xsl:variable>
    <xsl:apply-templates select="ppx:instances/ppx:configurations/ppx:configuration[@name=$config_name]">
      <xsl:with-param name="element_path">
        <xsl:call-template name="next_path">
          <xsl:with-param name="path" select="$instance_path"/>
        </xsl:call-template>
      </xsl:with-param>
    </xsl:apply-templates>
  </xsl:template>
  <xsl:template match="ppx:configuration">
    <xsl:param name="element_path"/>
    <xsl:choose>
      <xsl:when test="$element_path!=''">
        <xsl:variable name="child_name">
          <xsl:call-template name="element_name">
            <xsl:with-param name="path" select="$element_path"/>
          </xsl:call-template>
        </xsl:variable>
        <xsl:apply-templates select="ppx:resource[@name=$child_name] | ppx:globalVars/ppx:variable[@name=$child_name]/ppx:type/*[self::ppx:derived or self::ppx:struct or self::ppx:array]">
          <xsl:with-param name="element_path">
            <xsl:call-template name="next_path">
              <xsl:with-param name="path" select="$element_path"/>
            </xsl:call-template>
          </xsl:with-param>
        </xsl:apply-templates>
      </xsl:when>
      <xsl:otherwise>
        <xsl:value-of select="ns:ConfigTagName(@name)"/>
      </xsl:otherwise>
    </xsl:choose>
  </xsl:template>
  <xsl:template match="ppx:resource">
    <xsl:param name="element_path"/>
    <xsl:choose>
      <xsl:when test="$element_path!=''">
        <xsl:variable name="child_name">
          <xsl:call-template name="element_name">
            <xsl:with-param name="path">
              <xsl:value-of select="$element_path"/>
            </xsl:with-param>
          </xsl:call-template>
        </xsl:variable>
        <xsl:apply-templates select="ppx:pouInstance[@name=$child_name] | ppx:task/ppx:pouInstance[@name=$child_name] | ppx:globalVars/ppx:variable[@name=$child_name]/ppx:type/*[self::ppx:derived or self::ppx:struct or self::ppx:array]">
          <xsl:with-param name="element_path">
            <xsl:call-template name="next_path">
              <xsl:with-param name="path" select="$element_path"/>
            </xsl:call-template>
          </xsl:with-param>
        </xsl:apply-templates>
      </xsl:when>
      <xsl:otherwise>
        <xsl:value-of select="ns:ResourceTagName(ancestor::ppx:configuration/@name, @name)"/>
      </xsl:otherwise>
    </xsl:choose>
  </xsl:template>
  <xsl:template match="ppx:pouInstance">
    <xsl:param name="element_path"/>
    <xsl:variable name="type_name">
      <xsl:value-of select="@typeName"/>
    </xsl:variable>
    <xsl:apply-templates select="$all_types/ppx:pous/ppx:pou[@name=$type_name] |                  $all_types/ppx:dataTypes/ppx:dataType[@name=$type_name]">
      <xsl:with-param name="element_path" select="$element_path"/>
    </xsl:apply-templates>
  </xsl:template>
  <xsl:template match="ppx:pou">
    <xsl:param name="element_path"/>
    <xsl:choose>
      <xsl:when test="$element_path!=''">
        <xsl:variable name="child_name">
          <xsl:call-template name="element_name">
            <xsl:with-param name="path" select="$element_path"/>
          </xsl:call-template>
        </xsl:variable>
        <xsl:apply-templates select="ppx:interface/*/ppx:variable[@name=$child_name]/ppx:type/*[self::ppx:derived or self::ppx:struct or self::ppx:array]">
          <xsl:with-param name="element_path">
            <xsl:call-template name="next_path">
              <xsl:with-param name="path" select="$element_path"/>
            </xsl:call-template>
          </xsl:with-param>
        </xsl:apply-templates>
        <xsl:apply-templates select="ppx:actions/ppx:action[@name=$child_name] | ppx:transitions/ppx:transition[@name=$child_name]"/>
      </xsl:when>
      <xsl:otherwise>
        <xsl:variable name="name">
          <xsl:value-of select="@name"/>
        </xsl:variable>
        <xsl:value-of select="ns:PouTagName($name)"/>
      </xsl:otherwise>
    </xsl:choose>
  </xsl:template>
  <xsl:template match="ppx:action">
    <xsl:value-of select="ns:ActionTagName(ancestor::ppx:pou/@name, @name)"/>
  </xsl:template>
  <xsl:template match="ppx:transition">
    <xsl:value-of select="ns:TransitionTagName(ancestor::ppx:pou/@name, @name)"/>
  </xsl:template>
  <xsl:template match="ppx:dataType">
    <xsl:param name="element_path"/>
    <xsl:apply-templates select="ppx:baseType/*[self::ppx:derived or self::ppx:struct or self::ppx:array]">
      <xsl:with-param name="element_path" select="$element_path"/>
    </xsl:apply-templates>
  </xsl:template>
  <xsl:template match="ppx:derived">
    <xsl:param name="element_path"/>
    <xsl:variable name="type_name">
      <xsl:value-of select="@name"/>
    </xsl:variable>
    <xsl:apply-templates select="$all_types/ppx:pous/ppx:pou[@name=$type_name] |                  $all_types/ppx:dataTypes/ppx:dataType[@name=$type_name]">
      <xsl:with-param name="element_path" select="$element_path"/>
    </xsl:apply-templates>
  </xsl:template>
  <xsl:template match="ppx:array">
    <xsl:param name="element_path"/>
    <xsl:apply-templates select="ppx:baseType/*[self::ppx:derived or self::ppx:struct or self::ppx:array]">
      <xsl:with-param name="element_path" select="$element_path"/>
    </xsl:apply-templates>
  </xsl:template>
  <xsl:template match="ppx:struct">
    <xsl:param name="element_path"/>
    <xsl:variable name="child_name">
      <xsl:call-template name="element_name">
        <xsl:with-param name="path" select="$element_path"/>
      </xsl:call-template>
    </xsl:variable>
    <xsl:apply-templates select="ppx:variable[@name=$child_name]/ppx:type/*[self::ppx:derived or self::ppx:struct or self::ppx:array]">
      <xsl:with-param name="element_path">
        <xsl:call-template name="next_path">
          <xsl:with-param name="path" select="$element_path"/>
        </xsl:call-template>
      </xsl:with-param>
    </xsl:apply-templates>
  </xsl:template>
</xsl:stylesheet>