renaming core to chain and some other changes

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.

1 files changed, 1 insertions, 12 deletions

diff --git a/Cargo.toml b/Cargo.toml
index e672e74..77de27f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -13,24 +13,13 @@ rust-version = "1.65"
 # testing the new resolver, even though this has no dependencies  ;p
 
 [workspace]
-members = ["graph", "receme", "nfa", "repcore"]
+members = ["graph", "receme", "nfa", "chain", "viz"]
 resolver = "2"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-receme = { path = "receme" }
-
-[dev-dependencies]
-criterion = "0.4"
 
 [features]
 default = []
 tokenizer = []
-
-[profile.bench]
-debug = true
-
-[[bench]]
-name = "bench_receme"
-harness = false