Lifecycle of a SyntaxHighlighterAdapter

AsciidoctorJ will create an own instance for every document that it converts.

It will try to instantiate the class by calling a constructor that has three parameters:

name: The name of the syntax highlighter as it was referenced by the :source-highlighter attribute. In the previous example this was "myhighlightjs".
backend: The name of the backend used to convert the document. This is for example "html5". Note that SyntaxHighlighters can only be used for HTML based backends.
options: A map containing options for this syntax highlighter. Currently this contains the current org.asciidoctor.ast.Document for the key "document".

This means the syntax highlighter class could also have this constructor:

    public HighlightJsHighlighter(String name, String backend, Map<String, Object> options) {
        assertThat("myhighlightjs").isEqualTo(name);

        assertThat("html5").isEqualTo(backend);
        Document document = (Document) options.get("document");
        assertThat("Syntax Highlighter Test").isEqualTo(document.getDoctitle());
    }

A constructor with only the first two, or only the first parameter is also allowed. AsciidoctorJ will call the constructor with the most matching parameters.