Variable substitution inside tests.

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@198304 13f79535-47bb-0310-9956-ffa450edef68

test/layoutengine/testcase2fo.xsl

@@ -16,15 +16,50 @@
 -->
 <!-- $Id$ -->
 <!-- This stylesheet extracts the FO part from the testcase so it can be passed to FOP for layout. -->
+<!--
+Variable substitution:
+
+For any attribute value that starts with a "##" the stylesheet looks for an element with the variable 
+name under /testcase/variables, ex. "##img" looks for /testcase/variables/img and uses its element
+value as subsitution value.
+-->
 <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:fo="http://www.w3.org/1999/XSL/Format">
 
   <xsl:template match="testcase">
     <xsl:apply-templates select="fo/*" mode="copy"/>
   </xsl:template>
-
-  <xsl:template match="node()|@*" mode="copy">
+  
+  <xsl:template match="node()" mode="copy">
     <xsl:copy>
       <xsl:apply-templates select="@*|node()" mode="copy"/>
     </xsl:copy>
   </xsl:template>
+  
+  <xsl:template match="@*" mode="copy">
+    <xsl:choose>
+      <xsl:when test="starts-with(., '##')">
+        <!-- variable substitution -->
+        <xsl:variable name="nodename" select="name()"/>
+        <xsl:variable name="varname" select="substring(., 3)"/>
+        <xsl:choose>
+          <xsl:when test="boolean(//variables/child::*[local-name() = $varname])">
+            <xsl:attribute name="{name(.)}">
+              <xsl:value-of select="//variables/child::*[local-name() = $varname]"/>
+            </xsl:attribute>
+          </xsl:when>
+          <xsl:otherwise>
+            <!-- if variable isn't defined, just copy -->
+            <xsl:copy>
+              <xsl:apply-templates select="node()" mode="copy"/>
+            </xsl:copy>
+          </xsl:otherwise>
+        </xsl:choose>
+      </xsl:when>
+      <xsl:otherwise>
+        <xsl:copy>
+          <xsl:apply-templates select="node()" mode="copy"/>
+        </xsl:copy>
+      </xsl:otherwise>
+    </xsl:choose>
+  </xsl:template>
 </xsl:stylesheet>