Bug/custom tag parameters as string

[bkiers]

Fix for custom tag parameters being previously separated by commas. Now all (optional) parameters are 1 string (as per the Liquid specs).

Below an example of how it must be used:

public class Test {

    public static void main(String[] args) {

        String source = "{% highlight shell linenos %}\n" +
                "cd /opt/dev/myproject\n" +
                "mvn clean install\n" +
                "{% endhighlight %}";

        String rendered = Template
                .parse(source)
                .with(new Highlight())
                .render();

        System.out.println(rendered);
    }
}

class Highlight extends Tag {

    public Highlight() {
        super("highlight");
    }

    @Override
    public Object render(TemplateContext context, LNode... nodes) {

        // parameters will be null when no parameters are present
        Object parameters = nodes[0].render(context);

        // The inner contents of the tag will always be in nodes[1]
        String sourceCode = super.asString(nodes[1].render(context));

        System.out.printf("parameters=`%s`\nsourceCode=`%s`\n", parameters, sourceCode);

        return "TODO";
    }
}

Running the code above will print:

parameters=`shell linenos`
sourceCode=`
cd /opt/dev/myproject
mvn clean install
`
TODO

Also see: #42