sbsv2/raptor/python/raptor_xml.py
author Richard Taylor <richard.i.taylor@nokia.com>
Tue, 16 Mar 2010 15:18:39 +0000
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#
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# Copyright (c) 2007-2009 Nokia Corporation and/or its subsidiary(-ies).
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# All rights reserved.
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# This component and the accompanying materials are made available
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# under the terms of the License "Eclipse Public License v1.0"
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# which accompanies this distribution, and is available
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# at the URL "http://www.eclipse.org/legal/epl-v10.html".
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#
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# Initial Contributors:
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# Nokia Corporation - initial contribution.
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#
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# Contributors:
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#
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# Description: 
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# raptor_xml module
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#
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import os
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import raptor_data
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import raptor_utilities
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import xml.dom.minidom
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import re
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import generic_path
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# raptor_xml module attributes
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namespace = "http://symbian.com/xml/build"
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xsdVersion = "build/2_0.xsd"
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xsdIgnore = "build/666.xsd"
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_constructors = {"alias":raptor_data.Alias,
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				 "aliasRef":raptor_data.AliasRef,
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				 "append":raptor_data.Append,
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				 "env":raptor_data.Env,
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				 "group":raptor_data.Group,
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				 "groupRef":raptor_data.GroupRef,
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				 "interface":raptor_data.Interface,
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				 "interfaceRef":raptor_data.InterfaceRef,
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				 "param":raptor_data.Parameter,
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				 "paramgroup":raptor_data.ParameterGroup,
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				 "prepend":raptor_data.Prepend,
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				 "set":raptor_data.Set,
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				 "spec":raptor_data.Specification,
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				 "var":raptor_data.Variant,
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				 "varRef":raptor_data.VariantRef}
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# raptor_xml module classes
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class XMLError(Exception):
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	pass
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# raptor_xml module functions
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def Read(Raptor, filename):
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	"Read in a Raptor XML document"
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	# try to read and parse the XML file
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	try:
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		dom = xml.dom.minidom.parse(filename)
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	except: # a whole bag of exceptions can be raised here
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		raise XMLError
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	# <build> is always the root element
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	build = dom.documentElement
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	objects = []
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	fileVersion = build.getAttribute("xsi:schemaLocation")
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	# ignore the file it matches the "invalid" schema
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	if fileVersion.endswith(xsdIgnore):
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		return objects
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	# check that the file matches the expected schema
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	if not fileVersion.endswith(xsdVersion):
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		Raptor.Warn("file '%s' uses schema '%s' which does not end with the expected version '%s'", filename, fileVersion, xsdVersion)
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	# create a Data Model object from each sub-element
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	for child in build.childNodes:
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		if child.namespaceURI == namespace \
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		and child.nodeType == child.ELEMENT_NODE:
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			try:
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				o = XMLtoDataModel(Raptor, child)
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				if o is not None:
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					objects.append(o)
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			except raptor_data.InvalidChildError:
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				Raptor.Warn("Invalid element %s in %s", child.localName, filename)
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	# discard the XML
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	dom.unlink()
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	return objects
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def XMLtoDataModel(Raptor, node):
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	"Create a data-model object from an XML element"
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	# look-up a function to create an object from the node name
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	try:
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		constructor = _constructors[node.localName]
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	except KeyError:
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		Raptor.Warn("Unknown element %s", node.localName)
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		return
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	model = constructor()
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	# deal with the attributes first
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	if node.hasAttributes():
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		for i in range(node.attributes.length):
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			attribute = node.attributes.item(i)
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			try:
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				model.SetProperty(attribute.localName, attribute.value)
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			except raptor_data.InvalidPropertyError:
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				Raptor.Warn("Can't set attribute %s for element %s",
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							 attribute.localName, node.localName)
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	# add the sub-elements
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	for child in node.childNodes:
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		if child.namespaceURI == namespace \
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		and child.nodeType == child.ELEMENT_NODE:
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			try:
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				gc = XMLtoDataModel(Raptor, child)
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				if gc is not None:
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					model.AddChild(gc)
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			except raptor_data.InvalidChildError:
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				Raptor.Warn("Can't add child %s to element %s",
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							 child.localName, node.localName)
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	# only return a valid object (or raise error)
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	if model.Valid():
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		if model.IsApplicable():
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			return model
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		else:
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			return None
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	else:
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		raise raptor_data.InvalidChildError
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class SystemModelComponent(generic_path.Path):
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	"""Path sub-class that wraps up a component bld.inf file with
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	system_definition.xml context information."""
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	def __init__(self, aBldInfFile, aContainerNames, aSystemDefinitionFile, aSystemDefinitionBase, aSystemDefinitionVersion):
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		generic_path.Path.__init__(self, aBldInfFile.Absolute().path)
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		self.__ContainerNames = aContainerNames
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		self.__SystemDefinitionFile = aSystemDefinitionFile
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		self.__SystemDefinitionBase = aSystemDefinitionBase
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		self.__SystemDefinitionVersion = aSystemDefinitionVersion
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	def GetSystemDefinitionFile(self):
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		return self.__SystemDefinitionFile
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	def GetSystemDefinitionBase(self):
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		return self.__SystemDefinitionBase
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	def GetSystemDefinitionFile(self):
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		return self.__SystemDefinitionVersion
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	def GetContainerName(self, aContainerType):
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		if self.__ContainerNames.has_key(aContainerType):
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		  return self.__ContainerNames[aContainerType]
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		return ""
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class SystemModel(object):
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	"""A representation of the SystemModel section of a Symbian system_definition.xml file."""
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	def __init__(self, aLogger, aSystemDefinitionFile, aSystemDefinitionBase):
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		self.__Logger = aLogger
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		self.__SystemDefinitionFile = aSystemDefinitionFile.GetLocalString()
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		self.__SystemDefinitionBase = aSystemDefinitionBase.GetLocalString()
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		self.__Version = {'MAJOR':0,'MID':0,'MINOR':0}
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		self.__ComponentRoot = ""
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		self.__TotalComponents = 0
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		self.__LayerList = []
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		self.__LayerDetails = {}
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		self.__DOM = None
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		self.__SystemDefinitionElement = None
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		if self.__Read():
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			if self.__Validate():
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				self.__Parse()
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		if self.__DOM:
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			self.__DOM.unlink()
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	def HasLayer(self, aLayer):
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		return aLayer in self.__LayerList
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	def GetLayerNames(self):
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		return self.__LayerList
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	def GetLayerComponents(self, aLayer):
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		if not self.HasLayer(aLayer):
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			self.__Logger.Error("System Definition layer \"%s\" does not exist in %s", aLayer, self.__SystemDefinitionFile)
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			return []
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		return self.__LayerDetails[aLayer]
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	def IsLayerBuildable(self, aLayer):
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		if len(self.GetLayerComponents(aLayer)):
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			return True
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		return False
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	def GetAllComponents(self):
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		components = []
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		for layer in self.GetLayerNames():
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			components.extend(self.GetLayerComponents(layer))
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		return components
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	def DumpLayerInfo(self, aLayer):
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		if self.HasLayer(aLayer):
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			self.__Logger.Info("Found %d bld.inf references in layer \"%s\"", len(self.GetLayerComponents(aLayer)), aLayer)
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	def DumpInfo(self):
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		self.__Logger.Info("Found %d bld.inf references in %s within %d layers:", len(self.GetAllComponents()), self.__SystemDefinitionFile, len(self.GetLayerNames()))
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		self.__Logger.Info("\t%s", ", ".join(self.GetLayerNames()))
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		self.__Logger.InfoDiscovery(object_type = "layers",
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				count = len(self.GetLayerNames()))
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		self.__Logger.InfoDiscovery(object_type = "bld.inf references",
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				count = len(self.GetAllComponents()))
3
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	def __Read(self):
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		if not os.path.exists(self.__SystemDefinitionFile):
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			self.__Logger.Error("System Definition file %s does not exist", self.__SystemDefinitionFile)
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			return False
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		self.__Logger.Info("System Definition file %s", self.__SystemDefinitionFile)
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		# try to read the XML file
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		try:
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			self.__DOM = xml.dom.minidom.parse(self.__SystemDefinitionFile)
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		except: # a whole bag of exceptions can be raised here
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			self.__Logger.Error("Failed to parse XML file %s", self.__SystemDefinitionFile)
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			return False
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		# <SystemDefinition> is always the root element
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		self.__SystemDefinitionElement = self.__DOM.documentElement
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		return True
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	def __Validate(self):
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		# account for different schema versions in processing
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		# old format : version >= 1.3.0
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		# new format : version >= 2.0.0 (assume later versions are compatible...at least for now)
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		version = re.match(r'(?P<MAJOR>\d)\.(?P<MID>\d)(\.(?P<MINOR>\d))?', self.__SystemDefinitionElement.getAttribute("schema"))
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		if not version:
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			self.__Logger.Error("Cannot determine schema version of XML file %s", self.__SystemDefinitionFile)
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			return False
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		self.__Version['MAJOR'] = int(version.group('MAJOR'))
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		self.__Version['MID'] = int(version.group('MID'))
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		self.__Version['MINOR'] = int(version.group('MINOR'))
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		if self.__Version['MAJOR'] == 1 and self.__Version['MID'] > 2:
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			self.__ComponentRoot = self.__SystemDefinitionBase
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		elif self.__Version['MAJOR'] == 2:
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			# 2.0.0 format supports SOURCEROOT as an environment specified base - we respect this, unless
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			# explicitly overridden on the command line
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			if os.environ.has_key('SOURCEROOT'):
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				self.__ComponentRoot = generic_path.Path(os.environ['SOURCEROOT'])
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			if self.__SystemDefinitionBase and self.__SystemDefinitionBase != ".":
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				self.__ComponentRoot = self.__SystemDefinitionBase
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				if os.environ.has_key('SOURCEROOT'):
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					self.__Logger.Info("Command line specified System Definition file base \'%s\' overriding environment SOURCEROOT \'%s\'", self.__SystemDefinitionBase, os.environ['SOURCEROOT'])
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		else:
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			self.__Logger.Error("Cannot process schema version %s of file %s", version.string, self.__SystemDefinitionFile)
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			return False
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		return True
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	def __Parse(self):
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		# find the <systemModel> element (there can be 0 or 1) and search any <layer> elements for <unit> elements with "bldFile" attributes
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		# the <layer> context of captured "bldFile" attributes is recorded as we go
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		for child in self.__SystemDefinitionElement.childNodes:
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			if child.localName == "systemModel":
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				self.__ProcessSystemModelElement(child)
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	def __CreateComponent(self, aBldInfFile, aUnitElement):
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		# take a resolved bld.inf file and associated <unit/> element and returns a populated Component object
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		containers = {}
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		self.__GetElementContainers(aUnitElement, containers)
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		component = SystemModelComponent(aBldInfFile, containers, self.__SystemDefinitionFile, self.__SystemDefinitionBase, self.__Version)
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		return component
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	def __GetElementContainers(self, aElement, aContainers):
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		# take a <unit/> element and creates a type->name dictionary of all of its parent containers
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		# We're only interested in parent nodes if they're not the top-most node
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		if aElement.parentNode.parentNode:
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			parent = aElement.parentNode
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			name = parent.getAttribute("name")
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			if name:
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				aContainers[parent.tagName] = name
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			self.__GetElementContainers(parent, aContainers)
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	def __ProcessSystemModelElement(self, aElement):
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		"""Search for XML <unit/> elements with 'bldFile' attributes and resolve concrete bld.inf locations
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		with an appreciation of different schema versions."""
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		if aElement.tagName == "layer":
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			currentLayer = aElement.getAttribute("name")
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			if not self.__LayerDetails.has_key(currentLayer):
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				self.__LayerDetails[currentLayer] = []
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			if not currentLayer in self.__LayerList:
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				self.__LayerList.append(currentLayer)
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		elif aElement.tagName == "unit" and aElement.hasAttributes():
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			bldFileValue = aElement.getAttribute("bldFile")
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			if bldFileValue:
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				bldInfRoot = self.__ComponentRoot
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				if self.__Version['MAJOR'] == 1 and self.__Version['MID'] == 4:
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					# version 1.4.x schema paths can use DOS slashes
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					bldFileValue = raptor_utilities.convertToUnixSlash(bldFileValue)
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				elif self.__Version['MAJOR'] == 2:
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					# version 2.x.x schema paths are subject to a "root" attribute off-set, if it exists
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					rootValue = aElement.getAttribute("root")
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					if rootValue:
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						if os.environ.has_key(rootValue):
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							bldInfRoot = generic_path.Path(os.environ[rootValue])
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						else:
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							# Assume that this is an error i.e. don't attempt to resolve in relation to SOURCEROOT
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							bldInfRoot = None
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							self.__Logger.Error("Cannot resolve \'root\' attribute value \"%s\" in %s", rootValue, self.__SystemDefinitionFile)
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							return
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				group = generic_path.Path(bldFileValue)
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				if not group.isAbsolute() and bldInfRoot:
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					group = generic_path.Join(bldInfRoot, group)
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				bldinf = generic_path.Join(group, "bld.inf").FindCaseless()
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				if bldinf == None:
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					self.__Logger.Error("No bld.inf found at %s in %s", group.GetLocalString(), self.__SystemDefinitionFile)
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				else:
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					component = self.__CreateComponent(bldinf, aElement)
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					layer = component.GetContainerName("layer")
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					if layer:
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						self.__LayerDetails[layer].append(component)
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						self.__TotalComponents += 1
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					else:
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						self.__Logger.Error("No containing layer found for %s in %s", str(bldinf), self.__SystemDefinitionFile)
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		# search the sub-elements
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		for child in aElement.childNodes:
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			if child.nodeType == child.ELEMENT_NODE:
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				self.__ProcessSystemModelElement(child)
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# end of the raptor_xml module