#
# Copyright (c) 2007-2009 Nokia Corporation and/or its subsidiary(-ies).
# All rights reserved.
# This component and the accompanying materials are made available
# under the terms of the License "Eclipse Public License v1.0"
# which accompanies this distribution, and is available
# at the URL "http://www.eclipse.org/legal/epl-v10.html".
#
# Initial Contributors:
# Nokia Corporation - initial contribution.
#
# Contributors:
#
# Description: 
# raptor_xml module
#

import os
import raptor_data
import raptor_utilities
import xml.dom.minidom
import re
import generic_path

# raptor_xml module attributes

namespace = "http://symbian.com/xml/build"
xsdVersion = "build/2_0.xsd"
xsdIgnore = "build/666.xsd"

_constructors = {"alias":raptor_data.Alias,
				 "aliasRef":raptor_data.AliasRef,
				 "append":raptor_data.Append,
				 "env":raptor_data.Env,
				 "group":raptor_data.Group,
				 "groupRef":raptor_data.GroupRef,
				 "interface":raptor_data.Interface,
				 "interfaceRef":raptor_data.InterfaceRef,
				 "param":raptor_data.Parameter,
				 "paramgroup":raptor_data.ParameterGroup,
				 "prepend":raptor_data.Prepend,
				 "set":raptor_data.Set,
				 "spec":raptor_data.Specification,
				 "var":raptor_data.Variant,
				 "varRef":raptor_data.VariantRef}


# raptor_xml module classes

class XMLError(Exception):
	pass

# raptor_xml module functions

def Read(Raptor, filename):
	"Read in a Raptor XML document"

	# try to read and parse the XML file
	try:
		dom = xml.dom.minidom.parse(filename)

	except: # a whole bag of exceptions can be raised here
		raise XMLError

	# <build> is always the root element
	build = dom.documentElement
	objects = []

	fileVersion = build.getAttribute("xsi:schemaLocation")
	
	# ignore the file it matches the "invalid" schema
	if fileVersion.endswith(xsdIgnore):
		return objects
		
	# check that the file matches the expected schema
	if not fileVersion.endswith(xsdVersion):
		Raptor.Warn("file '%s' uses schema '%s' which does not end with the expected version '%s'", filename, fileVersion, xsdVersion)
		
	# create a Data Model object from each sub-element
	for child in build.childNodes:
		if child.namespaceURI == namespace \
		and child.nodeType == child.ELEMENT_NODE:
			try:
				o = XMLtoDataModel(Raptor, child)
				if o is not None:
					objects.append(o)
			except raptor_data.InvalidChildError:
				Raptor.Warn("Invalid element %s in %s", child.localName, filename)

	# discard the XML
	dom.unlink()
	return objects


def XMLtoDataModel(Raptor, node):
	"Create a data-model object from an XML element"

	# look-up a function to create an object from the node name
	try:
		constructor = _constructors[node.localName]

	except KeyError:
		Raptor.Warn("Unknown element %s", node.localName)
		return

	model = constructor()

	# deal with the attributes first
	if node.hasAttributes():
		for i in range(node.attributes.length):
			attribute = node.attributes.item(i)
			try:

				model.SetProperty(attribute.localName, attribute.value)

			except raptor_data.InvalidPropertyError:
				Raptor.Warn("Can't set attribute %s for element %s",
							 attribute.localName, node.localName)

	# add the sub-elements
	for child in node.childNodes:
		if child.namespaceURI == namespace \
		and child.nodeType == child.ELEMENT_NODE:
			try:
				gc = XMLtoDataModel(Raptor, child)
				if gc is not None:
					model.AddChild(gc)

			except raptor_data.InvalidChildError:
				Raptor.Warn("Can't add child %s to element %s",
							 child.localName, node.localName)

	# only return a valid object (or raise error)
	if model.Valid():
		if model.IsApplicable():
			return model
		else:
			return None
	else:
		raise raptor_data.InvalidChildError


class SystemModelComponent(generic_path.Path):
	"""Path sub-class that wraps up a component bld.inf file with
	system_definition.xml context information."""

	def __init__(self, aBldInfFile, aContainerNames, aSystemDefinitionFile, aSystemDefinitionBase, aSystemDefinitionVersion):
		generic_path.Path.__init__(self, aBldInfFile.Absolute().path)
		self.__ContainerNames = aContainerNames
		self.__SystemDefinitionFile = aSystemDefinitionFile
		self.__SystemDefinitionBase = aSystemDefinitionBase
		self.__SystemDefinitionVersion = aSystemDefinitionVersion

	def GetSystemDefinitionFile(self):
		return self.__SystemDefinitionFile

	def GetSystemDefinitionBase(self):
		return self.__SystemDefinitionBase

	def GetSystemDefinitionFile(self):
		return self.__SystemDefinitionVersion

	def GetContainerName(self, aContainerType):
		if self.__ContainerNames.has_key(aContainerType):
		  return self.__ContainerNames[aContainerType]
		return ""


class SystemModel(object):
	"""A representation of the SystemModel section of a Symbian system_definition.xml file."""

	def __init__(self, aLogger, aSystemDefinitionFile, aSystemDefinitionBase):
		self.__Logger = aLogger
		self.__SystemDefinitionFile = aSystemDefinitionFile.GetLocalString()
		self.__SystemDefinitionBase = aSystemDefinitionBase.GetLocalString()
		self.__Version = {'MAJOR':0,'MID':0,'MINOR':0}
		self.__ComponentRoot = ""
		self.__TotalComponents = 0
		self.__LayerList = []
		self.__LayerDetails = {}

		self.__DOM = None
		self.__SystemDefinitionElement = None

		if self.__Read():
			if self.__Validate():
				self.__Parse()

		if self.__DOM:
			self.__DOM.unlink()

	def HasLayer(self, aLayer):
		return aLayer in self.__LayerList

	def GetLayerNames(self):
		return self.__LayerList

	def GetLayerComponents(self, aLayer):
		if not self.HasLayer(aLayer):
			self.__Logger.Error("System Definition layer \"%s\" does not exist in %s", aLayer, self.__SystemDefinitionFile)
			return []

		return self.__LayerDetails[aLayer]

	def IsLayerBuildable(self, aLayer):
		if len(self.GetLayerComponents(aLayer)):
			return True
		return False

	def GetAllComponents(self):
		components = []

		for layer in self.GetLayerNames():
			components.extend(self.GetLayerComponents(layer))

		return components

	def DumpLayerInfo(self, aLayer):
		if self.HasLayer(aLayer):
			self.__Logger.Info("Found %d bld.inf references in layer \"%s\"", len(self.GetLayerComponents(aLayer)), aLayer)

	def DumpInfo(self):
		self.__Logger.Info("Found %d bld.inf references in %s within %d layers:", len(self.GetAllComponents()), self.__SystemDefinitionFile, len(self.GetLayerNames()))
		self.__Logger.Info("\t%s", ", ".join(self.GetLayerNames()))

	def __Read(self):
		if not os.path.exists(self.__SystemDefinitionFile):
			self.__Logger.Error("System Definition file %s does not exist", self.__SystemDefinitionFile)
			return False

		self.__Logger.Info("System Definition file %s", self.__SystemDefinitionFile)

		# try to read the XML file
		try:
			self.__DOM = xml.dom.minidom.parse(self.__SystemDefinitionFile)

		except: # a whole bag of exceptions can be raised here
			self.__Logger.Error("Failed to parse XML file %s", self.__SystemDefinitionFile)
			return False

		# <SystemDefinition> is always the root element
		self.__SystemDefinitionElement = self.__DOM.documentElement

		return True

	def __Validate(self):
		# account for different schema versions in processing
		# old format : version >= 1.3.0
		# new format : version >= 2.0.0 (assume later versions are compatible...at least for now)
		version = re.match(r'(?P<MAJOR>\d)\.(?P<MID>\d)(\.(?P<MINOR>\d))?', self.__SystemDefinitionElement.getAttribute("schema"))

		if not version:
			self.__Logger.Error("Cannot determine schema version of XML file %s", self.__SystemDefinitionFile)
			return False

		self.__Version['MAJOR'] = int(version.group('MAJOR'))
		self.__Version['MID'] = int(version.group('MID'))
		self.__Version['MINOR'] = int(version.group('MINOR'))

		if self.__Version['MAJOR'] == 1 and self.__Version['MID'] > 2:
			self.__ComponentRoot = self.__SystemDefinitionBase
		elif self.__Version['MAJOR'] == 2:
			# 2.0.0 format supports SOURCEROOT as an environment specified base - we respect this, unless
			# explicitly overridden on the command line
			if os.environ.has_key('SOURCEROOT'):
				self.__ComponentRoot = generic_path.Path(os.environ['SOURCEROOT'])
			if self.__SystemDefinitionBase and self.__SystemDefinitionBase != ".":
				self.__ComponentRoot = self.__SystemDefinitionBase
				if os.environ.has_key('SOURCEROOT'):
					self.__Logger.Info("Command line specified System Definition file base \'%s\' overriding environment SOURCEROOT \'%s\'", self.__SystemDefinitionBase, os.environ['SOURCEROOT'])
		else:
			self.__Logger.Error("Cannot process schema version %s of file %s", version.string, self.__SystemDefinitionFile)
			return False

		return True

	def __Parse(self):
		# find the <systemModel> element (there can be 0 or 1) and search any <layer> elements for <unit> elements with "bldFile" attributes
		# the <layer> context of captured "bldFile" attributes is recorded as we go
		for child in self.__SystemDefinitionElement.childNodes:
			if child.localName == "systemModel":
				self.__ProcessSystemModelElement(child)

	def __CreateComponent(self, aBldInfFile, aUnitElement):
		# take a resolved bld.inf file and associated <unit/> element and returns a populated Component object
		containers = {}
		self.__GetElementContainers(aUnitElement, containers)
		component = SystemModelComponent(aBldInfFile, containers, self.__SystemDefinitionFile, self.__SystemDefinitionBase, self.__Version)

		return component

	def __GetElementContainers(self, aElement, aContainers):
		# take a <unit/> element and creates a type->name dictionary of all of its parent containers
		# We're only interested in parent nodes if they're not the top-most node
		if aElement.parentNode.parentNode:
			parent = aElement.parentNode
			name = parent.getAttribute("name")

			if name:
				aContainers[parent.tagName] = name

			self.__GetElementContainers(parent, aContainers)

	def __ProcessSystemModelElement(self, aElement):
		"""Search for XML <unit/> elements with 'bldFile' attributes and resolve concrete bld.inf locations
		with an appreciation of different schema versions."""

		if aElement.tagName == "layer":
			currentLayer = aElement.getAttribute("name")

			if not self.__LayerDetails.has_key(currentLayer):
				self.__LayerDetails[currentLayer] = []

			if not currentLayer in self.__LayerList:
				self.__LayerList.append(currentLayer)

		elif aElement.tagName == "unit" and aElement.hasAttributes():
			bldFileValue = aElement.getAttribute("bldFile")

			if bldFileValue:
				bldInfRoot = self.__ComponentRoot

				if self.__Version['MAJOR'] == 1 and self.__Version['MID'] == 4:
					# version 1.4.x schema paths can use DOS slashes
					bldFileValue = raptor_utilities.convertToUnixSlash(bldFileValue)
				elif self.__Version['MAJOR'] == 2:
					# version 2.x.x schema paths are subject to a "root" attribute off-set, if it exists
					rootValue = aElement.getAttribute("root")

					if rootValue:
						if os.environ.has_key(rootValue):
							bldInfRoot = generic_path.Path(os.environ[rootValue])
						else:
							# Assume that this is an error i.e. don't attempt to resolve in relation to SOURCEROOT
							bldInfRoot = None
							self.__Logger.Error("Cannot resolve \'root\' attribute value \"%s\" in %s", rootValue, self.__SystemDefinitionFile)
							return

				group = generic_path.Path(bldFileValue)

				if not group.isAbsolute() and bldInfRoot:
					group = generic_path.Join(bldInfRoot, group)

				bldinf = generic_path.Join(group, "bld.inf").FindCaseless()

				if bldinf == None:
					self.__Logger.Error("No bld.inf found at %s in %s", group.GetLocalString(), self.__SystemDefinitionFile)
				else:
					component = self.__CreateComponent(bldinf, aElement)
					layer = component.GetContainerName("layer")
					if layer:
						self.__LayerDetails[layer].append(component)
						self.__TotalComponents += 1
					else:
						self.__Logger.Error("No containing layer found for %s in %s", str(bldinf), self.__SystemDefinitionFile)

		# search the sub-elements
		for child in aElement.childNodes:
			if child.nodeType == child.ELEMENT_NODE:
				self.__ProcessSystemModelElement(child)


# end of the raptor_xml module