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2023-06-02viz: finished decycle algorithmJSDurand
2022-12-23renaming core to chain and some other changesJSDurand
Some changes: - The core crate is renamed to "chain". - The crate "viz" is added, which will provide layered graph drawing algorithms. - A function is added to convert from a grammar to the regular language of its left-linear closures. - A function is added to convert from a nondeterministic finite automaton to its "null" closure. A null closure is the same automaton with edges added, as if some edges are "null". Whether an edge is null is determined by a function. Combined with the previous change, we can convert a grammar to the regular language of the null closure of its left-linear closures. --- Now it remains to test more grammars and add an Atom trait, before finishing the part about compilations.