source: stylesheets/lfs-xsl/docbook-xsl-1.78.1/highlighting/common.xsl@ 111bb20

<?xml version='1.0'?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"

                xmlns:s6hl="http://net.sf.xslthl/ConnectorSaxon6" 
                xmlns:sbhl="http://net.sf.xslthl/ConnectorSaxonB" 
                xmlns:xhl="http://net.sf.xslthl/ConnectorXalan"
                xmlns:saxon6="http://icl.com/saxon" 
                xmlns:saxonb="http://saxon.sf.net/" 
                xmlns:xalan="http://xml.apache.org/xalan"
                
                xmlns:exsl="http://exslt.org/common"
                xmlns:xslthl="http://xslthl.sf.net"
                exclude-result-prefixes="exsl xslthl s6hl sbhl xhl"
                version='1.0'>

<!-- ********************************************************************
     $Id: common.xsl 8257 2009-02-20 04:40:16Z abdelazer $
     ********************************************************************

     This file is part of the XSL DocBook Stylesheet distribution.
     See ../README or http://docbook.sf.net/release/xsl/current/ for
     and other information.

     ******************************************************************** -->

<!-- this construction is needed to have the saxon and xalan connectors working alongside each other -->
<xalan:component prefix="xhl" functions="highlight"> 
  <xalan:script lang="javaclass" src="xalan://net.sf.xslthl.ConnectorXalan" /> 
</xalan:component> 

<!-- for saxon 6 -->
<saxon6:script implements-prefix="s6hl" language="java" src="java:net.sf.xslthl.ConnectorSaxon6" />

<!-- for saxon 8.5 and later -->
<saxonb:script implements-prefix="sbhl" language="java" src="java:net.sf.xslthl.ConnectorSaxonB" />


<!-- You can override this template to do more complex mapping of
     language attribute to highlighter language ID (see xslthl-config.xml) -->
<xsl:template name="language.to.xslthl">
  <xsl:param name="context"/>

  <xsl:choose>
    <xsl:when test="$context/@language != ''">
      <xsl:value-of select="$context/@language"/>
    </xsl:when>
    <xsl:when test="$highlight.default.language != ''">
      <xsl:value-of select="$highlight.default.language"/>
    </xsl:when>
  </xsl:choose>
</xsl:template>

<xsl:template name="apply-highlighting">
  <xsl:choose>
    <!-- Do we want syntax highlighting -->
    <xsl:when test="$highlight.source != 0">
      <xsl:variable name="language">
        <xsl:call-template name="language.to.xslthl">
          <xsl:with-param name="context" select="."/>
        </xsl:call-template>
      </xsl:variable>
      <xsl:choose>
        <xsl:when test="$language != ''">
          <xsl:variable name="content">
            <xsl:apply-templates/>
          </xsl:variable>
          <xsl:choose>
            <xsl:when test="function-available('s6hl:highlight')">
              <xsl:apply-templates select="s6hl:highlight($language, exsl:node-set($content), $highlight.xslthl.config)"
                                   mode="xslthl"/>
            </xsl:when>
            <xsl:when test="function-available('sbhl:highlight')">
              <xsl:apply-templates select="sbhl:highlight($language, exsl:node-set($content), $highlight.xslthl.config)"
                                   mode="xslthl"/>
            </xsl:when>
            <xsl:when test="function-available('xhl:highlight')">
              <xsl:apply-templates select="xhl:highlight($language, exsl:node-set($content), $highlight.xslthl.config)"
                                   mode="xslthl"/>
            </xsl:when>
            <xsl:otherwise>
              <xsl:copy-of select="$content"/>
            </xsl:otherwise>
          </xsl:choose>
        </xsl:when>
        <xsl:otherwise>
          <xsl:apply-templates/>
        </xsl:otherwise>
      </xsl:choose>
    </xsl:when>
    <!-- No syntax highlighting -->
    <xsl:otherwise>
      <xsl:apply-templates/>
    </xsl:otherwise>
  </xsl:choose>
</xsl:template>

<!-- A fallback when the specific style isn't recognized -->
<xsl:template match="xslthl:*" mode="xslthl">
  <xsl:message>
    <xsl:text>unprocessed xslthl style: </xsl:text>
    <xsl:value-of select="local-name(.)" />
  </xsl:message>
  <xsl:apply-templates mode="xslthl"/>
</xsl:template>

<!-- Copy over already produced markup (FO/HTML) -->
<xsl:template match="node()" mode="xslthl" priority="-1">
  <xsl:copy>
    <xsl:apply-templates select="node()" mode="xslthl"/>
  </xsl:copy>
</xsl:template>

<xsl:template match="*" mode="xslthl">
  <xsl:copy>
    <xsl:copy-of select="@*"/>
    <xsl:apply-templates select="node()" mode="xslthl"/>
  </xsl:copy>
</xsl:template>

</xsl:stylesheet>