<?xml version="1.0"?>

<xsl:stylesheet saxon:trace="no"
    version="1.1"
    xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
    xmlns:saxon="http://icl.com/saxon"
    xmlns:xs = "http://www.w3.org/2001/XMLSchema"
    xmlns:fo="http://www.w3.org/1999/XSL/Format"
    xmlns:date="http://exslt.org/dates-and-times"
    xmlns:math="http://exslt.org/math"
    extension-element-prefixes="saxon date math"
    exclude-result-prefixes="fo xs">

<xsl:output method="xml" version="4.0" omit-xml-declaration="yes" indent="yes"/>
<xsl:strip-space elements="*"/>

<xsl:variable name="properties" select="document('foproperties.xml')"/>

<xsl:template match="/xs:schema">
  <xsl:apply-templates select="./xs:element"/>
</xsl:template>

<xsl:template match="xs:group">
  <xsl:for-each select="./xs:choice/xs:element">
    <xsl:value-of select="./@ref"/>
    <xsl:text>|</xsl:text>
  </xsl:for-each>
  <!-- Remove any Groups not implemented by FOP -->
  <xsl:for-each select="./xs:choice/xs:group[substring(./@ref,string-length(./@ref) - 3) != '_Not']">
    <xsl:variable name="ref">
      <xsl:call-template name="strip_fo">
        <xsl:with-param name="ref" select="./@ref"/>
      </xsl:call-template>
    </xsl:variable>
    <xsl:apply-templates select="/xs:schema/xs:group[@name=$ref]"/>
  </xsl:for-each>
</xsl:template>

<xsl:template match="xs:attributeGroup">
  <xsl:for-each select="./xs:attribute">
    <xsl:apply-templates select="."/>
  </xsl:for-each>
  <!-- Remove any attributeGroups not implemented by FOP -->
  <xsl:for-each select="./xs:attributeGroup[substring(./@ref,string-length(./@ref) - 3) != '_Not']">
    <xsl:variable name="ref">
      <xsl:call-template name="strip_fo">
        <xsl:with-param name="ref" select="./@ref"/>
      </xsl:call-template>
    </xsl:variable>
    <xsl:apply-templates select="/xs:schema/xs:attributeGroup[@name = $ref]"/>
  </xsl:for-each>
</xsl:template>

<xsl:template match="xs:simpleType">
  <xsl:variable name="name" select="@name"/>
  <xsl:for-each select="./xs:restriction/xs:enumeration">
    <xsl:value-of select="./@value"/>
    <xsl:text>|</xsl:text>
    <xsl:message>Attribute <xsl:value-of select="./@value"/></xsl:message>
  </xsl:for-each>
  <xsl:variable name="unions" select="./xs:union/@memberTypes"/>
  <xsl:if test="$unions">
    <xsl:call-template name="splitUnion">
      <xsl:with-param name="union" select="$unions"/>
    </xsl:call-template>
  </xsl:if>
    <xsl:for-each select="./xs:annotation/xs:documentation/xs:enumeration">
      <xsl:comment>
        This supplies annotated list values inserted in the schema
        solely for the purpose of supplying examples of valid values for a type.
      </xsl:comment>
      <xsl:value-of select="./@value"/>
      <xsl:text>|</xsl:text>
      <xsl:message>Fake Attribute <xsl:value-of select="./@value"/></xsl:message>
    </xsl:for-each>
</xsl:template>

<xsl:template name="splitUnion">
  <xsl:param name="union"/>
  <xsl:variable name="type">
    <xsl:call-template name="strip_fo">
      <xsl:with-param name="ref">
        <xsl:if test="not(substring-before($union,' '))">
          <xsl:value-of select="$union"/>
        </xsl:if>
        <xsl:value-of select="substring-before($union,' ')"/>
      </xsl:with-param>
    </xsl:call-template>
  </xsl:variable>
  <xsl:message>Calling <xsl:value-of select="$type"/></xsl:message>
  <xsl:apply-templates select="/xs:schema/xs:simpleType[@name = $type]"/>
  <xsl:if test="substring-after($union,' ')">
    <xsl:call-template name="splitUnion">
      <xsl:with-param name="union" select="substring-after($union,' ')"/>
    </xsl:call-template>
  </xsl:if>
</xsl:template>

<xsl:template match="xs:element">
  <xsl:text disable-output-escaping="yes">&lt;element name="fo:</xsl:text>
  <xsl:value-of select="./@name"/>
  <xsl:text>"
content="</xsl:text>
  <xsl:choose>
    <xsl:when test="( not(./xs:complexType/xs:sequence) and not(./xs:complexType/xs:choice) )">
      <xsl:text>EMPTY</xsl:text>
    </xsl:when>
    <xsl:otherwise>
      <xsl:text>(</xsl:text>
      <xsl:if test="./xs:complexType/@mixed = 'true'">
        <xsl:text>#PCDATA|</xsl:text>
      </xsl:if>
      <xsl:for-each select="./xs:complexType/xs:sequence|./xs:complexType/xs:choice">
        <xsl:for-each select="./xs:element">
          <xsl:value-of select="./@ref"/>
          <xsl:text>|</xsl:text>
        </xsl:for-each>
        <xsl:for-each select="./xs:group">
          <xsl:variable name="ref">
            <xsl:call-template name="strip_fo">
              <xsl:with-param name="ref" select="./@ref"/>
            </xsl:call-template>
          </xsl:variable>
          <xsl:apply-templates select="/xs:schema/xs:group[@name=$ref]"/>
        </xsl:for-each>
      </xsl:for-each>
      <xsl:text>)</xsl:text>
    </xsl:otherwise>
  </xsl:choose>
  <xsl:text disable-output-escaping="yes">"&gt;
</xsl:text>
  <xsl:for-each select="./xs:complexType/xs:attribute">
    <xsl:apply-templates select="."/>
  </xsl:for-each>
  <xsl:for-each select="./xs:complexType/xs:attributeGroup">
    <xsl:variable name="ref">
      <xsl:call-template name="strip_fo">
        <xsl:with-param name="ref" select="./@ref"/>
      </xsl:call-template>
    </xsl:variable>
    <xsl:apply-templates select="/xs:schema/xs:attributeGroup[@name = $ref]"/>
  </xsl:for-each>
  <xsl:text disable-output-escaping="yes">
&lt;/element&gt;
</xsl:text>
</xsl:template>

<xsl:template match="xs:attribute">
  <xsl:variable name="attributeName" select="./@name"/>
  <xsl:variable name="type">
    <xsl:call-template name="strip_fo">
      <xsl:with-param name="ref" select="./@type"/>
    </xsl:call-template>
  </xsl:variable>
  <xsl:message>Processing type = <xsl:value-of select="$type"/></xsl:message>
  <attribute name="{$attributeName}">
    <xsl:attribute name="type">
      <xsl:variable name="content">
        <xsl:choose>
          <xsl:when test="$properties/property-list/generic-property-list/property[name = $attributeName]/enumeration">
            <!-- Get the valid values from FOP -->
            <xsl:for-each select="$properties/property-list/generic-property-list/property[name = $attributeName]/enumeration/value">
              <xsl:value-of select="."/><xsl:text>|</xsl:text>
            </xsl:for-each>
          </xsl:when>
          <xsl:otherwise>
            <xsl:apply-templates select="/xs:schema/xs:simpleType[@name = $type]"/>
          </xsl:otherwise>
        </xsl:choose>
      </xsl:variable>
      <xsl:choose>
        <xsl:when test="$content != ''">
          <xsl:text>(</xsl:text>
          <xsl:value-of select="$content"/>
          <xsl:text>)</xsl:text>
        </xsl:when>
        <xsl:otherwise>
          <xsl:text>CDATA</xsl:text>
        </xsl:otherwise>
      </xsl:choose>
    </xsl:attribute>
  </attribute>
</xsl:template>

<xsl:template name="strip_fo">
  <xsl:param name="ref"/>
  <xsl:choose>
    <xsl:when test="substring($ref,1,3) = 'fo:'">
      <xsl:value-of select="substring($ref,4)"/>
    </xsl:when>
    <xsl:otherwise>
      <xsl:value-of select="$ref"/>
    </xsl:otherwise>
  </xsl:choose>
</xsl:template>

</xsl:stylesheet>