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2023-07-08Finished the Emacs binding.JSDurand
Now the binding part is finished. What remains is a bug encountered when planting a fragment to the forest which intersects a packed node, which would lead to invalid forests. This will also cause problem when planting a packed fragment, but until now my testing grammars do not produce packed fragments, so this problem is not encountered yet. I am still figuring out efficient ways to solve this problem.
2023-02-27before a major refactorJSDurand
I decide to adopt a new approach of recording and updating item derivation forests. Since this affects a lot of things, I decide to commit before the refactor, so that I can create a branch for that refactor.
2023-01-28a prototype of an item derivation forestJSDurand
It seems to be complete now, but still awaits more tests to see where the errors are, which should be plenty, haha.
2023-01-03structural change: separate crates outJSDurand
I put functionalities that are not strictly core to separate crates, so that the whole package becomes more modular, and makes it easier to try other parsing algorithms in the future. Also I have to figure the forests out before finishing the core chain-rule algorithm, as the part about forests affects the labels of the grammars directly. From my experiences in writing the previous version, it is asking for trouble to change the labels type dramatically at a later point: too many places need to be changed. Thus I decide to figure the rough part of forests out. Actually I only have to figure out how to attach forests fragments to edges of the underlying atomic languages, and the more complex parts of putting forests together can be left to the recorders, which is my vision of assembling semi-ring values during the chain-rule machine. It should be relatively easy to produce forests fragments from grammars since we are just trying to extract some information from the grammar, not to manipulate those information in some complicated way. We have to do some manipulations in the process, though, in order to make sure that the nulling and epsilon-removal processes do not invalidate these fragments.