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(* Copyright (c) 2008, Adam Chlipala
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* - The names of contributors may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*)
structure ElabOps :> ELAB_OPS = struct
open Elab
structure E = ElabEnv
structure U = ElabUtil
fun liftKindInKind' by =
U.Kind.mapB {kind = fn bound => fn k =>
case k of
KRel xn =>
if xn < bound then
k
else
KRel (xn + by)
| _ => k,
bind = fn (bound, _) => bound + 1}
fun subKindInKind' rep =
U.Kind.mapB {kind = fn (by, xn) => fn k =>
case k of
KRel xn' =>
(case Int.compare (xn', xn) of
EQUAL => #1 (liftKindInKind' by 0 rep)
| GREATER => KRel (xn' - 1)
| LESS => k)
| _ => k,
bind = fn ((by, xn), _) => (by+1, xn+1)}
val liftKindInKind = liftKindInKind' 1
fun subKindInKind (xn, rep) = subKindInKind' rep (0, xn)
fun liftKindInCon by =
U.Con.mapB {kind = fn bound => fn k =>
case k of
KRel xn =>
if xn < bound then
k
else
KRel (xn + by)
| _ => k,
con = fn _ => fn c => c,
bind = fn (bound, U.Con.RelK _) => bound + 1
| (bound, _) => bound}
fun subKindInCon' rep =
U.Con.mapB {kind = fn (by, xn) => fn k =>
case k of
KRel xn' =>
(case Int.compare (xn', xn) of
EQUAL => #1 (liftKindInKind' by 0 rep)
| GREATER => KRel (xn' - 1)
| LESS => k)
| _ => k,
con = fn _ => fn c => c,
bind = fn ((by, xn), U.Con.RelK _) => (by+1, xn+1)
| (st, _) => st}
val liftKindInCon = liftKindInCon 1
fun subKindInCon (xn, rep) = subKindInCon' rep (0, xn)
fun liftConInCon by =
U.Con.mapB {kind = fn _ => fn k => k,
con = fn bound => fn c =>
case c of
CRel xn =>
if xn < bound then
c
else
CRel (xn + by)
| CUnif (nl, loc, k, s, r) => CUnif (nl+by, loc, k, s, r)
| _ => c,
bind = fn (bound, U.Con.RelC _) => bound + 1
| (bound, _) => bound}
exception SubUnif
fun subConInCon' rep =
U.Con.mapB {kind = fn _ => fn k => k,
con = fn (by, xn) => fn c =>
case c of
CRel xn' =>
(case Int.compare (xn', xn) of
EQUAL => #1 (liftConInCon by 0 rep)
| GREATER => CRel (xn' - 1)
| LESS => c)
| CUnif (0, _, _, _, _) => raise SubUnif
| CUnif (n, loc, k, s, r) => CUnif (n-1, loc, k, s, r)
| _ => c,
bind = fn ((by, xn), U.Con.RelC _) => (by+1, xn+1)
| (ctx, _) => ctx}
val liftConInCon = liftConInCon 1
fun subConInCon (xn, rep) = subConInCon' rep (0, xn)
fun subStrInSgn (m1, m2) =
U.Sgn.map {kind = fn k => k,
con = fn c as CModProj (m1', ms, x) =>
if m1 = m1' then
CModProj (m2, ms, x)
else
c
| c => c,
sgn_item = fn sgi => sgi,
sgn = fn sgn => sgn}
val occurs =
U.Con.existsB {kind = fn _ => false,
con = fn (n, c) =>
case c of
CRel n' => n' = n
| _ => false,
bind = fn (n, b) =>
case b of
U.Con.RelC _ => n + 1
| _ => n}
0
val identity = ref 0
val distribute = ref 0
val fuse = ref 0
fun reset () = (identity := 0;
distribute := 0;
fuse := 0)
fun hnormCon env (cAll as (c, loc)) =
case c of
CUnif (nl, _, _, _, ref (SOME c)) => (#1 (hnormCon env (E.mliftConInCon nl c)), loc)
| CNamed xn =>
(case E.lookupCNamed env xn of
(_, _, SOME c') => hnormCon env c'
| _ => cAll)
| CModProj (n, ms, x) =>
let
val (_, sgn) = E.lookupStrNamed env n
val (str, sgn) = foldl (fn (m, (str, sgn)) =>
case E.projectStr env {sgn = sgn, str = str, field = m} of
NONE => raise Fail "hnormCon: Unknown substructure"
| SOME sgn => ((StrProj (str, m), loc), sgn))
((StrVar n, loc), sgn) ms
in
case E.projectCon env {sgn = sgn, str = str, field = x} of
NONE => raise Fail "kindof: Unknown con in structure"
| SOME (_, NONE) => cAll
| SOME (_, SOME c) => hnormCon env c
end
(* Eta reduction *)
| CAbs (x, k, b) =>
(case #1 (hnormCon (E.pushCRel env x k) b) of
CApp (f, (CRel 0, _)) =>
if occurs f then
cAll
else
hnormCon env (subConInCon (0, (CUnit, loc)) f)
| _ => cAll)
| CApp (c1, c2) =>
(case #1 (hnormCon env c1) of
CAbs (x, k, cb) =>
let
val sc = (hnormCon env (subConInCon (0, c2) cb))
handle SynUnif => cAll
(*val env' = E.pushCRel env x k*)
in
(*Print.eprefaces "Subst" [("x", Print.PD.string x),
("cb", ElabPrint.p_con env' cb),
("c2", ElabPrint.p_con env c2),
("sc", ElabPrint.p_con env sc)];*)
sc
end
| c1' as CApp (c', f) =>
let
fun default () = (CApp ((c1', loc), hnormCon env c2), loc)
in
case #1 (hnormCon env c') of
CMap (ks as (k1, k2)) =>
(case #1 (hnormCon env c2) of
CRecord (_, []) => (CRecord (k2, []), loc)
| CRecord (_, (x, c) :: rest) =>
hnormCon env
(CConcat ((CRecord (k2, [(x, (CApp (f, c), loc))]), loc),
(CApp (c1, (CRecord (k2, rest), loc)), loc)), loc)
| CConcat ((CRecord (k, (x, c) :: rest), _), rest') =>
let
val rest'' = (CConcat ((CRecord (k, rest), loc), rest'), loc)
in
hnormCon env
(CConcat ((CRecord (k2, [(x, (CApp (f, c), loc))]), loc),
(CApp (c1, rest''), loc)), loc)
end
| _ =>
let
fun unconstraint c =
case hnormCon env c of
(TDisjoint (_, _, c), _) => unconstraint c
| c => c
fun inc r = r := !r + 1
fun tryDistributivity () =
case hnormCon env c2 of
(CConcat (c1, c2'), _) =>
let
val c = (CMap ks, loc)
val c = (CApp (c, f), loc)
val c1 = (CApp (c, c1), loc)
val c2 = (CApp (c, c2'), loc)
val c = (CConcat (c1, c2), loc)
in
inc distribute;
hnormCon env c
end
| _ => default ()
fun tryFusion () =
case #1 (hnormCon env c2) of
CApp (f', r') =>
(case #1 (hnormCon env f') of
CApp (f', inner_f) =>
(case #1 (hnormCon env f') of
CMap (dom, _) =>
let
val inner_f = liftConInCon 0 inner_f
val f = liftConInCon 0 f
val f' = (CApp (inner_f, (CRel 0, loc)), loc)
val f' = (CApp (f, f'), loc)
val f' = (CAbs ("v", dom, f'), loc)
val c = (CMap (dom, k2), loc)
val c = (CApp (c, f'), loc)
val c = (CApp (c, r'), loc)
in
inc fuse;
hnormCon env c
end
| _ => tryDistributivity ())
| _ => tryDistributivity ())
| _ => tryDistributivity ()
fun tryIdentity () =
let
fun cunif () =
let
val r = ref NONE
in
(r, (CUnif (0, loc, (KType, loc), "_", r), loc))
end
val (vR, v) = cunif ()
val c = (CApp (f, v), loc)
in
case unconstraint c of
(CUnif (_, _, _, _, vR'), _) =>
if vR' = vR then
(inc identity;
hnormCon env c2)
else
tryFusion ()
| _ => tryFusion ()
end
in
tryIdentity ()
end)
| _ => default ()
end
| c1' => (CApp ((c1', loc), hnormCon env c2), loc))
| CKApp (c1, k) =>
(case hnormCon env c1 of
(CKAbs (_, body), _) => hnormCon env (subKindInCon (0, k) body)
| _ => cAll)
| CConcat (c1, c2) =>
(case (hnormCon env c1, hnormCon env c2) of
((CRecord (k, xcs1), loc), (CRecord (_, xcs2), _)) =>
(CRecord (k, xcs1 @ xcs2), loc)
| ((CRecord (_, []), _), c2') => c2'
| ((CConcat (c11, c12), loc), c2') =>
hnormCon env (CConcat (c11, (CConcat (c12, c2'), loc)), loc)
| (c1', (CRecord (_, []), _)) => c1'
| (c1', c2') => (CConcat (c1', c2'), loc))
| CProj (c, n) =>
(case hnormCon env c of
(CTuple cs, _) => hnormCon env (List.nth (cs, n - 1))
| _ => cAll)
| _ => cAll
end
|
