Method first

output/java8/1.4.15/Interpreter.java:946–957

Return the first attribute if multi-valued, or the attribute itself if single-valued. This method is used for rendering expressions of the form .

(InstanceScope scope, Object v)

     */

    public Object first(InstanceScope scope, Object v) {
        if ( v==null ) return null;
        Object r = v;
        v = convertAnythingIteratableToIterator(scope, v);
        if ( v instanceof Iterator ) {
            Iterator<?> it = (Iterator<?>)v;
            if ( it.hasNext() ) {
                r = it.next();
            }
        }
        return r;
    }

    /**
     * Return the last attribute if multi-valued, or the attribute itself if