multiple productions on same symbol: object order not preserved

[nylki]

lets say you have:

axiom: 'ABC'
productions: {
  'B>C': 'X',
  'A<B': 'Y',
  'B': 'Z'
}

This is currently allowed. (Internally a successors: [] is created).

All three productions on 'B' meet the context sensitive condition.
You would expect to have 'X' returned, because it is the first in the list.
This is however not guaranteed to be the case, because object property order is not guaranteed to be preserved! See eg: http://stackoverflow.com/questions/5525795/does-javascript-guarantee-object-property-order/38218582#38218582

This is an edge-gase and generally no problem for most L-Systems, but could still cause problems.

Solution

• Recommended: use object-based productions like: successors: [{leftCtx: ...}, {leftCtx: ....}], because in that case, the order is preserved by the successors array.

• setting productions via setProduction() in your prefered order

• alternatively: change library. switch/allow to tuple-arrays in productions