diff options
Diffstat (limited to 'kernel/esubst.ml')
| -rw-r--r-- | kernel/esubst.ml | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/kernel/esubst.ml b/kernel/esubst.ml index 4b8edf63f..9fc3b11d7 100644 --- a/kernel/esubst.ml +++ b/kernel/esubst.ml @@ -134,6 +134,29 @@ let rec exp_rel lams k subs = let expand_rel k subs = exp_rel 0 k subs +let rec subs_map f = function +| ESID _ as s -> s +| CONS (x, s) -> CONS (Array.map f x, subs_map f s) +| SHIFT (n, s) -> SHIFT (n, subs_map f s) +| LIFT (n, s) -> LIFT (n, subs_map f s) + +let rec lift_subst mk_cl s1 s2 = match s1 with +| ELID -> subs_map (fun c -> mk_cl ELID c) s2 +| ELSHFT(s, k) -> subs_shft(k, lift_subst mk_cl s s2) +| ELLFT (k, s) -> + match s2 with + | CONS(x,s') -> + CONS(CArray.Fun1.map mk_cl s1 x, lift_subst mk_cl s1 s') + | ESID n -> lift_subst mk_cl s (ESID (n + k)) + | SHIFT(k',s') -> + if k<k' + then subs_shft(k, lift_subst mk_cl s (subs_shft(k'-k, s'))) + else subs_shft(k', lift_subst mk_cl (el_liftn (k-k') s) s') + | LIFT(k',s') -> + if k<k' + then subs_liftn k (lift_subst mk_cl s (subs_liftn (k'-k) s')) + else subs_liftn k' (lift_subst mk_cl (el_liftn (k-k') s) s') + let rec comp mk_cl s1 s2 = match (s1, s2) with | _, ESID _ -> s1 |