History child of parallel state not rendering correctly

Expected Behavior

In the following state machine:

initial,
outer,
parallel {
  s1 {
    s11 -> s12;
  },
  s2 {
    s21 -> s22;
  },
  history;
};

initial -> parallel;
parallel -> outer;
outer -> history;

The history state is expected to show up as a child of the parallel state…

Current Behavior

Instead, the history state is rendered incorrectly and shows up next to the parallel state:

If the history state is not mentioned in any transition, it is not rendered at all.

Steps to Reproduce (for bugs)

Whenever a parallel state has a history child, the problem occurs.

Context

For my purposes, history states should be allowed to be children of parallel states.

Your Environment

Ubuntu 19.10. state-machine-cat 6.0.1 from NPM. Node 10.15.2 (from Ubuntu repository)

Exact same problem with the online version: https://state-machine-cat.js.org/

[joeriexelmans]

Hi @sverweij ! Thank you very much for the quick response. I can confirm your fix is working for my original use case.

[sverweij]

@joeriexelmans o wow that looks like cool master thesis. Thanks for sharing this!

render.py is the conversion script?

I’m still looking for an alternative to GraphViz that has the capabilities needed for state machines, but that look better (so pretty OK gets to wow that’s nice!) and have better native web support.