diff options
Diffstat (limited to 'spartan/core/lib.ML')
| -rw-r--r-- | spartan/core/lib.ML | 37 |
1 files changed, 33 insertions, 4 deletions
diff --git a/spartan/core/lib.ML b/spartan/core/lib.ML index 7b93a08..392ae2e 100644 --- a/spartan/core/lib.ML +++ b/spartan/core/lib.ML @@ -6,13 +6,16 @@ val max: ('a * 'a -> bool) -> 'a list -> 'a val maxint: int list -> int (*Terms*) -val is_rigid: term -> bool val no_vars: term -> bool +val is_rigid: term -> bool +val is_eq: term -> bool +val dest_prop: term -> term val dest_eq: term -> term * term val mk_Var: string -> int -> typ -> term val lambda_var: term -> term -> term val is_typing: term -> bool +val mk_typing: term -> term -> term val dest_typing: term -> term * term val term_of_typing: term -> term val type_of_typing: term -> term @@ -21,6 +24,7 @@ val mk_Pi: term -> term -> term -> term val typing_of_term: term -> term (*Goals*) +val decompose_goal: Proof.context -> term -> term list * term val rigid_typing_concl: term -> bool (*Subterms*) @@ -49,9 +53,15 @@ val maxint = max (op >) (* Meta *) +val no_vars = not o exists_subterm is_Var + val is_rigid = not o is_Var o head_of -val no_vars = not o exists_subterm is_Var +fun is_eq (Const (\<^const_name>\<open>Pure.eq\<close>, _) $ _ $ _) = true + | is_eq _ = false + +fun dest_prop (Const (\<^const_name>\<open>Pure.prop\<close>, _) $ P) = P + | dest_prop P = P fun dest_eq (Const (\<^const_name>\<open>Pure.eq\<close>, _) $ t $ def) = (t, def) | dest_eq _ = error "dest_eq" @@ -72,8 +82,10 @@ fun lambda_var x tm = fun is_typing (Const (\<^const_name>\<open>has_type\<close>, _) $ _ $ _) = true | is_typing _ = false +fun mk_typing t T = \<^const>\<open>has_type\<close> $ t $ T + fun dest_typing (Const (\<^const_name>\<open>has_type\<close>, _) $ t $ T) = (t, T) - | dest_typing _ = error "dest_typing" + | dest_typing t = raise TERM ("dest_typing", [t]) val term_of_typing = #1 o dest_typing val type_of_typing = #2 o dest_typing @@ -82,11 +94,28 @@ fun mk_Pi v typ body = Const (\<^const_name>\<open>Pi\<close>, dummyT) $ typ $ l fun typing_of_term tm = \<^const>\<open>has_type\<close> $ tm $ Var (("*?", 0), \<^typ>\<open>o\<close>) (*The above is a bit hacky; basically we need to guarantee that the schematic - var is fresh*) + var is fresh. This works for now because no other code in the Isabelle system + or the current logic uses this identifier.*) (** Goals **) +(*Breaks a goal \<And>x ... y. \<lbrakk>P1; ... Pn\<rbrakk> \<Longrightarrow> Q into ([P1, ..., Pn], Q), fixing + \<And>-quantified variables and keeping schematics.*) +fun decompose_goal ctxt goal = + let + val focus = + #1 (Subgoal.focus_prems ctxt 1 NONE (Thm.trivial (Thm.cterm_of ctxt goal))) + + val schematics = #2 (#schematics focus) + |> map (fn (v, ctm) => (Thm.term_of ctm, Var v)) + in + map Thm.prop_of (#prems focus) @ [Thm.term_of (#concl focus)] + |> map (subst_free schematics) + |> (fn xs => chop (length xs - 1) xs) |> apsnd the_single + end + handle List.Empty => error "Lib.decompose_goal" + fun rigid_typing_concl goal = let val concl = Logic.strip_assums_concl goal in is_typing concl andalso is_rigid (term_of_typing concl) end |