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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.
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Previously there was a minor bug: if the chain-rule machine ended in a
node without children, which node should be accepting because of edges
that have no children and hence were ignored, then since the node has
no children, it would be regarded as not accepting. Now this issue is
fixed by introducting real or imaginary edges, where an imaginary edge
is used to determine the acceptance of nodes without chidlren.
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Previously cloning a node does not alter the root of the forest, while
it should alter the root if the cloned node was the root. This would
affect how we compare the equalities of forests. It indeed resulted
in anomalies that were hard to solve.
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I need more than the ability to clone nodes: I also need to split the
nodes. Now this seems to be correctly added.
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Finally the prototype parser has produced the first correct forest.
It is my first time to generate a correct forest, in fact, ever since
the beginning of this project.
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It seems to be complete now, but still awaits more tests to see where
the errors are, which should be plenty, haha.
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