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* chain/src/item/default/mod.rs:
* graph/src/labelled/binary.rs:
* graph/src/labelled/double.rs:
* graph/src/lib.rs: If we set the option "ordering" to be "out" in the
declaration of nodes at the beginning, then GraphViz will not change
the order of children out of nodes. This is much better looking in
my opinion.
* INSTALL: make insists in changing this file, so let it be.
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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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I have an ostensibly working prototype now.
Further tests are needed to make sure that the algorithm meets the
time complexity requirement, though.
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Now the grammar will record the left-linear expansions when generating
the nondeterministic finite automaton frmo its rules, and will record
whether an edge in the nondeterministic finite automaton comes from a
left-linear expansion. The latter is needed because while performing
a chain-rule derivation, we do not need the left-linear expanded
derivations in the "first layer". This might well have been the root
cause of the bad performance of the previous version of this package.
Also I have figured out how to properly generate and handle parse
forests while manipulating the "chain-rule machine".
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Now I have a new type of labelled graphs, which can index vertices by
labels, but not index edges by labels. The biggest difference is that
I do not have to keep a hashmap of edge targets by labels, and I do
not have to guard against the duplication of nodes with the same set
of edges. I guard against nodes with the same label, though.
Also, in this graph, both vertices and edges have one label at a time,
whereas in the previous labelled graph there can be a multitude of
edges between the same source and target nodes, but with different
labels.
Now it remains to test this type of graphs, and to think through how
we attach forest fragments to nondeterministic finite automata edges,
and how to join forest fragments together while skipping nullable
edges, in order to finish the "compilation" part.
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