This library is a Saxon XPath extension function that transform source code to highlighted HTML, as highlight.js does, but without any JavaScript embeded in HTML.

To use this library, declare it as dependency :

  <dependency>
    <groupId>top.marchand.xml.saxon.extension</groupId>
    <artifactId>highlight</artifactId>
    <version>1.00.01</version>
  </dependency>

Then, declare this extension when creating Processor :

  Configuration configuration = Configuration.newConfiguration();
  Processor proc = new Processor(configuration);
  proc.registerExtensionFunction(
      new top.marchand.xml.saxon.extension.highlight.HighlightExtension());

Function's namespace is top:marchand:xml:extfunctions. You may use any prefix, but chm is commonly adopted.

Then in XPath, function is available :

  chm:highlight(language as xs:string, sourceCode as xs:string)
  chm:highlight(
      language as xs:string,
      sourceCode as xs:string,
      config as map(xs:string,xs:string)
  )

First form, with two parameters, generates an item()* sequence of span elements and text(), in http://www.w3.org/1999/xhtml namespace. If you need a different namespace, use the second form with a map as third argument. The only supported map-entry is 'result-ns', and its value is the required target namespace.

  chm:highlight('xml','<test>value</test>')

Produces

  <span xmlns="http://www.w3.org/1999/xhtml" class="hljs-tag">&lt;<span class="hljs-name">test</span>&gt;</span>value<span xmlns="http://www.w3.org/1999/xhtml" class="hljs-tag">&lt;/<span class="hljs-name">test</span>&gt;</span>

  chm:highlight('xml','<test>value</test>',map{'result-ns':''})

Produces

  <span class="hljs-tag">&lt;<span class="hljs-name">test</span>&gt;</span>value<span class="hljs-tag">&lt;/<span class="hljs-name">test</span>&gt;</span>