XSL path normalization to make all stupid validators happy

xsl/common.xsl

@@ -53,8 +53,16 @@
   </xsl:template>
 
   <xsl:template match="image">
+    <xsl:variable name="path">
+      <xsl:call-template name="normalize-path">
+	<xsl:with-param name="path">
+	  <xsl:value-of select="string(.)"/>
+	</xsl:with-param>
+      </xsl:call-template>
+    </xsl:variable>
+
     <img
-      src="{.}"
+      src="{$path}"
       title="{@title}"
       alt="{@title}"
       class="{@class}"/>
@@ -321,4 +329,37 @@
     </xsl:choose>
   </xsl:template>
 
+  <xsl:template name="normalize-path">
+    <xsl:param name="path"/>
+
+    <xsl:choose>
+      <xsl:when test="contains($path, '/')">
+	<xsl:variable name="dir1" select="substring-before($path, '/')"/>
+	<xsl:variable name="dir2" select="substring-after($path, '/')"/>
+	<xsl:choose>
+	  <xsl:when test="starts-with($dir2, '../')">
+	    <!-- recurse with xxx/../ removed -->
+	    <xsl:call-template name="normalize-path">
+	      <xsl:with-param name="path">
+		<xsl:value-of select="substring-after($dir2, '../')"/>
+	      </xsl:with-param>
+	    </xsl:call-template>
+	  </xsl:when>
+	  <xsl:otherwise>
+	    <!-- spit out and recurse with tail -->
+	    <xsl:value-of select="$dir1"/><xsl:text>/</xsl:text><xsl:call-template name="normalize-path">
+	      <xsl:with-param name="path">
+		<xsl:value-of select="$dir2"/>
+	      </xsl:with-param>
+	    </xsl:call-template>
+	  </xsl:otherwise>
+	</xsl:choose>
+      </xsl:when>
+      <xsl:otherwise>
+	<!-- just a filename with no / -->
+	<xsl:value-of select="$path"/>
+      </xsl:otherwise>
+    </xsl:choose>
+  </xsl:template>
+
 </xsl:stylesheet>

xsl/html5.xsl

@@ -276,14 +276,20 @@
     <xsl:param name="itemposition"/>
 
     <img>
-      <xsl:choose>
-        <xsl:when test="contains(., '://')">
-          <xsl:attribute name="src"><xsl:value-of select="."/></xsl:attribute>
-        </xsl:when>
-        <xsl:otherwise>
-          <xsl:attribute name="src"><xsl:value-of select="concat($baseurl, 'images/news/', .)"/></xsl:attribute>
-        </xsl:otherwise>
-      </xsl:choose>
+      <xsl:attribute name="src">
+	<xsl:call-template name="normalize-path">
+	  <xsl:with-param name="path">
+	    <xsl:choose>
+	      <xsl:when test="contains(., '://')">
+		<xsl:value-of select="."/>
+	      </xsl:when>
+	      <xsl:otherwise>
+		<xsl:value-of select="concat($baseurl, 'images/news/', .)"/>
+	      </xsl:otherwise>
+	    </xsl:choose>
+	  </xsl:with-param>
+	</xsl:call-template>
+      </xsl:attribute>
 
       <xsl:attribute name="title"><xsl:value-of select="@title"/></xsl:attribute>
       <xsl:attribute name="alt"><xsl:value-of select="@title"/></xsl:attribute>