if (activation == null) {
            return;
        }
        class ActivationFrame {
            String location;
            Optional<? extends InputLocationTracker> parent;

            ActivationFrame(String location, Optional<? extends InputLocationTracker> parent) {
                this.location = location;
                this.parent = parent;
            }
        }

        interpolator.addValueSource(new MapBasedValueSource(context.getSystemProperties()));

        class Interpolation {
            final InputLocationTracker target;

            final InterpolateString impl;

            Interpolation(InputLocationTracker target, InterpolateString impl) {
                this.target = target;
                this.impl = impl;
            }