Upgrade to newer jison repo

[knsv]

The current version of jison used by mermaid is not maintained. There is a fork with some 1000 more commits under its belt. Letys switch to that version instead.

https://github.com/GerHobbelt/jison

[mearns]

This might not be quite as trivial as I had assumed; just installing the new package, jison-gho, doesn't quite solve it as there seem to be some incompatibilities between this and the old package. I'm attempting to work my way through it, but not being familiar with jison, I don't know if I'll be able to resolve it.

[mearns]

Just wanted to leave a quick note that I haven't made any progress on this, and probably won't, in case anyone else is thinking about it.

[klemmchr]

I just had a look into that. This will contain a lot of breaking changes that could be problematic with features developed in other branches. I managed to resolve the first issues but the state diagram is creating this strange error

    TypeError: yyvstack[(yysp - 1)].push is not a function



      at Object.parser__PerformAction (src/diagrams/state/parser/stateDiagram.jison:865:28)
      at Parser.parse (src/diagrams/state/parser/stateDiagram.jison:1882:40)
      at Object.parse (src/diagrams/state/stateDiagram.spec.js:68:14)

Any idea what this could be @knsv? I have a rough idea but I had no deeper look into the state diagram language definition yet.

[jgreywolf]

The corresponding PR has been closed due to the extreme age of the changes.