From ad2e11471dbfc0894b4fdfedd895e7f0a75bd930 Mon Sep 17 00:00:00 2001 From: Matthieu Sozeau Date: Wed, 24 Sep 2014 11:16:11 +0200 Subject: First version of keyed subterm selection in unification. --- library/keys.ml | 46 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) create mode 100644 library/keys.ml (limited to 'library/keys.ml') diff --git a/library/keys.ml b/library/keys.ml new file mode 100644 index 000000000..5c295a385 --- /dev/null +++ b/library/keys.ml @@ -0,0 +1,46 @@ +open Globnames +open Term +open Libobject + +(* Union-find structure for references to be considered equivalent *) + +module RefUF = Unionfind.Make(Refset)(Refmap) + +let keys = (* Summary.ref ( *)RefUF.create ()(* ) ~name:"Keys_decl" *) + +let add_key k v = RefUF.union k v keys + +let equiv_keys k k' = RefUF.find k keys == RefUF.find k' keys + +(** Registration of keys as an object *) + +let load_key _ (_,(ref,ref')) = + add_key ref ref' + +let cache_key o = + load_key 1 o + +let subst_key (subst,(ref,ref')) = + (subst_global_reference subst ref, + subst_global_reference subst ref') + +let discharge_key (_,refs) = + match refs with + | VarRef _, _ | _, VarRef _ -> None + | ref, ref' -> Some (pop_global_reference ref, pop_global_reference ref') + +let rebuild_key (ref,ref') = (ref, ref') + +type key_obj = global_reference * global_reference + +let inKeys : key_obj -> obj = + declare_object {(default_object "KEYS") with + cache_function = cache_key; + load_function = load_key; + subst_function = subst_key; + classify_function = (fun x -> Substitute x); + discharge_function = discharge_key; + rebuild_function = rebuild_key } + +let declare_keys ref ref' = + Lib.add_anonymous_leaf (inKeys (ref,ref')) -- cgit v1.2.3