<?xml version="1.0"?>
 <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
	<xsl:output method="xml" indent="yes"/>
	
	<xsl:param name="Path">os/deviceplatformrelease/foundation_system/system_model</xsl:param>
	<!-- $Path is the location of the root system definition XML file. Must not end in /
		This is used to compute the absolute paths the 2.0 syntax needs-->
	<xsl:param name="Root"/> <!-- space separated list of root variables in the form "VAR1=value1 VAR=value2" --> 
	<xsl:variable name="root" select="concat(' ',$Root,' ')"/> <!-- sort of hack to allow absolute paths in downgraded output -->
	<xsl:variable name="srcroot" select="substring-before(substring-after($root,' SRCROOT='),' ')"/> <!-- the default path prefix -->

<xsl:template match="/*">
	<xsl:message terminate="yes">Cannot process this document</xsl:message>
</xsl:template>

<!-- can only handle 3.0.0 to 2.0.1 transforms
	Assumes only packages are using href
 -->
<xsl:template match="/SystemDefinition[@schema='3.0.0']"> 
	<!-- process root system definition or package definition-->
	<xsl:call-template name="DTD"/> <!-- insert 2.0.01 DTD -->
  <SystemDefinition name="{*/@name}" schema="2.0.1">
  	<xsl:apply-templates select="*|comment()"/>
  </SystemDefinition>
</xsl:template>

<xsl:template match="/SystemDefinition[@schema='3.0.0' and systemModel]"> 
	<xsl:call-template name="DTD"/> <!-- insert 2.0.01 DTD -->
  <SystemDefinition name="{systemModel/@name}" schema="2.0.1">
  	<xsl:apply-templates select="*|comment()"/>
  </SystemDefinition>
</xsl:template>

<xsl:template match="/SystemDefinition/package[@href]" priority="2">
	<xsl:message terminate="yes">Package definition cannot link another package</xsl:message>
</xsl:template>

<xsl:template match="/SystemDefinition/package" priority="1">
	<!-- process package definition file--> 
  <systemModel>
  	<layer name="anonymous"> <!-- fake layer -->
		<block>
			<xsl:apply-templates mode="copy" select="@id|@name|@span|@level|@levels"/><!--  valid attribuites for 2.0 -->
		  	<xsl:apply-templates select="*|comment()">
		  		<xsl:with-param name="path" select="concat($Path,'/')"/> <!-- need to keep tack of where the current document is -->
		  	</xsl:apply-templates>			
		</block>  
   	</layer>
  </systemModel>
</xsl:template>



<xsl:template match="/"><xsl:apply-templates select="*"/></xsl:template>
<xsl:template match="@*|comment()"><xsl:copy-of select="."/></xsl:template> 
	<!-- comments are copied verbatim. Attribtues are copied by default -->

<xsl:template match="systemModel">
	<systemModel>
  	<xsl:apply-templates select="*|comment()"> <!-- no attributes -->
  		<xsl:with-param name="path" select="$Path"/> <!-- need to keep tack of where the current document is -->
  	</xsl:apply-templates>
	</systemModel>
</xsl:template>

<xsl:template mode="copy" match="@*">
	<xsl:copy-of select="."/>
</xsl:template>

<xsl:template mode="copy" match="@id"> <!-- id in 3.0 is name in 2.0 -->
	<xsl:attribute name="name"><xsl:value-of select="."/></xsl:attribute>
</xsl:template>

<xsl:template mode="copy" match="@name">  <!-- name in 3.0 is long-name in 2.0.1 -->
	<xsl:if test=".!=../@id"> <!-- don't bother if it will be the same as name -->
		<xsl:attribute name="long-name"><xsl:value-of select="."/></xsl:attribute>
	</xsl:if>
</xsl:template>
	
<xsl:template match="layer"><xsl:param name="path"/>
	<layer>
		<xsl:apply-templates mode="copy" select="@id|@name|@span|@levels"/> <!--  valid attribuites for 2.0 -->
		<xsl:apply-templates select="*|comment()"> 
			<xsl:with-param name="path" select="$path"/> 
		</xsl:apply-templates>
	</layer>
</xsl:template>

<xsl:template match="layer/package"><!-- translates to block -->
	<xsl:param name="path"/>
	<block>
		<xsl:apply-templates mode="copy" select="@id|@name|@span|@level|@levels"/><!--  valid attribuites for 2.0 -->
		<xsl:choose>
			<xsl:when test="@href">
				<xsl:variable name="this" select="."/>
				<xsl:for-each select="document(@href,.)/SystemDefinition/*">
					<xsl:variable name="my-id"><xsl:apply-templates mode="normalize-id" select="@id"/></xsl:variable>
					<xsl:variable name="other-id"><xsl:apply-templates mode="normalize-id" select="$this/@id"/></xsl:variable>
					<xsl:if test="$my-id != $other-id">
						<xsl:message terminate="yes">Error: IDs do not match: <xsl:value-of select="$my-id"/> vs <xsl:value-of select="$other-id"/></xsl:message>
					</xsl:if>
					<xsl:if test="@name and @name!=@id and not($this/@name and $this/@name=$this/@id)">
						<!-- set long-name only if name is different from the id and not set in child doc -->
						<xsl:attribute name="long-name"><xsl:value-of select="@name"/></xsl:attribute>
					</xsl:if>						
					<xsl:for-each select="@span|@levels|@level">
						<!-- copy only if not set in child doc -->
						<xsl:if test="not(this/@*[name()=name(current())])">
							<xsl:copy-of select="."/>
						</xsl:if>
					</xsl:for-each>
					<xsl:apply-templates select="*|comment()">
	  					<xsl:with-param name="path">
	  						<xsl:call-template name="normpath">
	  							<xsl:with-param name="path" select="concat($path,'/',$this/@href)"/>
	  						</xsl:call-template>
	  					</xsl:with-param> 
	  				</xsl:apply-templates>
				</xsl:for-each>
			</xsl:when>
			<xsl:otherwise>
				<xsl:apply-templates select="*|comment()">
  					<xsl:with-param name="path" select="$path"/> 
  				</xsl:apply-templates>
			</xsl:otherwise>
		</xsl:choose>
	</block>
</xsl:template>

<xsl:template match="package/package">	<!-- translates to subblock --><xsl:param name="path"/>
	<subblock>
		<xsl:apply-templates mode="copy" select="@id|@name"/>
		<xsl:apply-templates select="*|comment()">
			<xsl:with-param name="path" select="$path"/> 
		</xsl:apply-templates>
	</subblock>
</xsl:template>

<xsl:template match="package/package/pacakge"> <!-- cannot nest this deep --><xsl:param name="path"/>
	<xsl:message>Excessive nesting of packages: Ignoring <xsl:value-of select="@id"/></xsl:message>
	<xsl:apply-templates select="*|comment()">
		<xsl:with-param name="path" select="$path"/> 
	</xsl:apply-templates>
</xsl:template>


<xsl:template match="collection"><xsl:param name="path"/>
	<collection>
		<xsl:apply-templates mode="copy" select="@id|@name|@level"/>
		<xsl:apply-templates select="*|comment()">
			<xsl:with-param name="path" select="$path"/> 
		</xsl:apply-templates>
	</collection>
</xsl:template>


<xsl:template match="component"><xsl:param name="path"/>
	<component>
		<xsl:apply-templates mode="copy" select="@id|@name|@deprecated|@introduced|@filter|@purpose"/>
		<xsl:if test="contains(concat(' ',@class,' '),' plugin ')">
			<xsl:attribute name="plugin">Y</xsl:attribute>
		</xsl:if>
		<xsl:call-template name="class">
			<xsl:with-param name="remove">plugin</xsl:with-param>
			<xsl:with-param name="add">
				<xsl:if test="not(*) and comment()">placeholder</xsl:if>
				<xsl:if test="@target='desktop'"> PC</xsl:if>
			</xsl:with-param>
		</xsl:call-template>
	  	<xsl:apply-templates select="*|comment()">
			<xsl:with-param name="path" select="$path"/> 
		</xsl:apply-templates>
	</component>
</xsl:template>

<xsl:template match="unit[@base and not(@mrp or @bldFile)]"/>

<xsl:template match="unit"><xsl:param name="path"/>
	<unit>
		<xsl:apply-templates select="@mrp|@bldFile|@late">
			<xsl:with-param name="path" select="$path"/> 
		</xsl:apply-templates>
		<xsl:copy-of select="@filter|@root[not(contains($root,concat(' ',.,'=')))]|@version|@prebuilt|@priority"/>
	</unit>
</xsl:template>

<xsl:template match="unit/@late"> <!-- 2.0 uses Y/N, 3.0 uses yes/no -->
	<xsl:attribute name="{name()}">
		<xsl:choose>
			<xsl:when test=".='yes'">Y</xsl:when>
			<xsl:when test=".='no'">N</xsl:when>
		</xsl:choose>
	</xsl:attribute>
</xsl:template>

<xsl:template match="@mrp|@bldFile"><xsl:param name="path"/>
	<xsl:attribute name="{name()}">
		<xsl:choose>
			<xsl:when test="../@root">
				<xsl:variable name="pre" select="substring-before(substring-after($root,concat(' ',../@root,'=')),' ')"/>
				<xsl:if test="$pre!=''"><xsl:value-of select="concat($pre,'/')"/></xsl:if>
			</xsl:when>
			<xsl:when test="$srcroot!=''">
				<xsl:value-of select="concat($srcroot,'/')"/>
			</xsl:when>
		</xsl:choose>
		<xsl:choose>
		<xsl:when test="starts-with(.,'/')"> <!-- keep absolute paths verbatim (barring the leading / ) -->
			<xsl:value-of select="substring-after(.,'/')"/>
		</xsl:when>
		<xsl:otherwise>	
			<xsl:call-template name="normpath">
  				<xsl:with-param name="path">
  					<xsl:call-template name="before">
						<xsl:with-param name="text" select="$path"/>
					</xsl:call-template>
					<xsl:value-of select="."/>
  				</xsl:with-param>
  			</xsl:call-template>
		</xsl:otherwise>
	</xsl:choose>
	</xsl:attribute>
</xsl:template>

<xsl:template match="meta"/> <!-- strip all meta tags -->

<xsl:template match="meta[info/@contract]"> <!-- except contract -->
	<xsl:copy-of select="info/@contract"/>
</xsl:template>

<xsl:template match="@id" mode="normalize-id">
	<xsl:choose>
		<xsl:when test="contains(@id,':')"><xsl:value-of select="substring-after(@id,':')"/></xsl:when>
		<xsl:otherwise><xsl:value-of select="@id"/></xsl:otherwise>
	</xsl:choose>
</xsl:template>

<xsl:template name="class"><xsl:param name="remove"/><xsl:param name="add"/>
<!--  returns the value of the class attribute with the space-separated list of names in $remove taken out and those in $add added on (does not check for duplicates) -->
	<xsl:param name="class" select="normalize-space(@class)"/>
	<xsl:variable name="r">
		<xsl:text> </xsl:text>
		<xsl:choose>
			<xsl:when test="contains($remove,' ')"><xsl:value-of select="substring-before($remove,' ')"/></xsl:when>
			<xsl:otherwise><xsl:value-of select="$remove"/></xsl:otherwise>
		</xsl:choose>
		<xsl:text> </xsl:text>
	</xsl:variable>
	<xsl:variable name="c">
		<xsl:choose>
			<xsl:when test="contains(concat(' ',$class,' '),$r)">
				<xsl:value-of select="substring-before(concat(' ',$class,' '),$r)"/>
				<xsl:text> </xsl:text>
				<xsl:value-of select="substring-after(concat(' ',$class,' '),$r)"/>
			</xsl:when>
			<xsl:otherwise><xsl:value-of select="$class"/></xsl:otherwise>
		</xsl:choose>
		<xsl:if test="normalize-space($add)!=''"><xsl:value-of select="concat(' ',normalize-space($add))"/></xsl:if>
	</xsl:variable>
	<xsl:choose>
		<xsl:when test="contains($remove,' ')">
			<xsl:call-template name="class">
				<xsl:with-param name="remove" select="substring-after($remove,' ')"/>
				<xsl:with-param name="class" select="$c"/>
			</xsl:call-template>
		</xsl:when>
		<xsl:when test="normalize-space($c)!=''">
			<xsl:attribute name="class">
				<xsl:value-of select="normalize-space($c)"/>
			</xsl:attribute>
		</xsl:when>
	</xsl:choose>
</xsl:template>

<xsl:template name="normpath"><xsl:param name="path"/>
<!-- normalize out any ".." in the path in $path  -->
<xsl:choose>
	<xsl:when test="contains($path,'/../')">
	<xsl:call-template name="normpath">
		<xsl:with-param name="path">
		<xsl:call-template name="before">
			<xsl:with-param name="text" select="substring-before($path,'/../')"/>
		</xsl:call-template>
		<xsl:value-of select="substring-after($path,'/../')"/>
		</xsl:with-param>
		</xsl:call-template>
	</xsl:when>
	<xsl:otherwise><xsl:value-of select="$path"/></xsl:otherwise>
</xsl:choose>
</xsl:template>

<!-- return all text before the last / -->
<xsl:template name="before"><xsl:param name="text"/>
<xsl:if test="contains($text,'/')">
	<xsl:value-of select="substring-before($text,'/')"/>/<xsl:call-template name="before"><xsl:with-param name="text" select="substring-after($text,'/')"/></xsl:call-template>
	</xsl:if>
</xsl:template>

<xsl:template name="DTD">
<xsl:text disable-output-escaping="yes"><![CDATA[<!DOCTYPE SystemDefinition [
<!ELEMENT SystemDefinition ( systemModel )>
<!ATTLIST SystemDefinition
  name CDATA #REQUIRED
  schema CDATA #REQUIRED
>
<!-- all paths are relative to the environment variable specified by the root attribute, or SOURCEROOT if not.  -->

<!-- System Model Section of DTD -->
<!ELEMENT systemModel (layer+)>

<!ELEMENT layer (block* | collection*)*>
<!-- Kernel Services, Base Services, OS Services, Etc -->
<!ATTLIST layer
  name CDATA #REQUIRED
  long-name CDATA #IMPLIED
  levels NMTOKENS #IMPLIED
  span CDATA #IMPLIED
>

<!ELEMENT block (subblock* | collection*)*>
 <!-- Generic OS services, Comms Services, etc -->
<!ATTLIST block
  levels NMTOKENS #IMPLIED
  span CDATA #IMPLIED
  level NMTOKEN #IMPLIED
  name CDATA #REQUIRED
  long-name CDATA #IMPLIED
>

<!ELEMENT subblock (collection)*>
<!-- Cellular Baseband Services, Networking Services, etc -->
<!ATTLIST subblock
  name CDATA #REQUIRED
  long-name CDATA #IMPLIED
>

<!ELEMENT collection (component)*>
<!-- Screen Driver, Content Handling, etc -->
<!ATTLIST collection
  name CDATA #REQUIRED
  long-name CDATA #IMPLIED
  level NMTOKEN #IMPLIED
>

<!ELEMENT component (unit)*>
<!-- contains units or is a  package or prebuilt -->
<!ATTLIST component
  name CDATA #REQUIRED
  long-name CDATA #IMPLIED
  deprecated CDATA #IMPLIED
  introduced CDATA #IMPLIED
  contract CDATA #IMPLIED
  plugin (Y|N) "N"
  filter CDATA #IMPLIED
  class NMTOKENS #IMPLIED
  supports CDATA #IMPLIED
  purpose ( optional | mandatory | development ) "optional"
>

<!ELEMENT unit EMPTY >
<!-- must be buildable (bld.inf) -->
<!-- bldFile  may someday be removed in favour of mrp -->
<!ATTLIST unit
  mrp CDATA #IMPLIED
  filter CDATA #IMPLIED
  bldFile CDATA #IMPLIED
  root CDATA #IMPLIED
  version NMTOKEN #IMPLIED
  prebuilt NMTOKEN #IMPLIED
  late (Y|N) #IMPLIED
  priority CDATA #IMPLIED
>
]>
]]></xsl:text>
</xsl:template>
</xsl:stylesheet>