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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 ElabUtil :> ELAB_UTIL = struct
open Elab
structure S = Search
structure Kind = struct
fun mapfold f =
let
fun mfk k acc =
S.bindP (mfk' k acc, f)
and mfk' (kAll as (k, loc)) =
case k of
KType => S.return2 kAll
| KArrow (k1, k2) =>
S.bind2 (mfk k1,
fn k1' =>
S.map2 (mfk k2,
fn k2' =>
(KArrow (k1', k2'), loc)))
| KName => S.return2 kAll
| KRecord k =>
S.map2 (mfk k,
fn k' =>
(KRecord k', loc))
| KError => S.return2 kAll
| KUnif (_, ref (SOME k)) => mfk' k
| KUnif _ => S.return2 kAll
in
mfk
end
fun exists f k =
case mapfold (fn k => fn () =>
if f k then
S.Return ()
else
S.Continue (k, ())) k () of
S.Return _ => true
| S.Continue _ => false
end
structure Con = struct
fun mapfold {kind = fk, con = fc} =
let
val mfk = Kind.mapfold fk
fun mfc c acc =
S.bindP (mfc' c acc, fc)
and mfc' (cAll as (c, loc)) =
case c of
TFun (c1, c2) =>
S.bind2 (mfc c1,
fn c1' =>
S.map2 (mfc c2,
fn c2' =>
(TFun (c1', c2'), loc)))
| TCFun (e, x, k, c) =>
S.bind2 (mfk k,
fn k' =>
S.map2 (mfc c,
fn c' =>
(TCFun (e, x, k', c'), loc)))
| TRecord c =>
S.map2 (mfc c,
fn c' =>
(TRecord c', loc))
| CRel _ => S.return2 cAll
| CNamed _ => S.return2 cAll
| CApp (c1, c2) =>
S.bind2 (mfc c1,
fn c1' =>
S.map2 (mfc c2,
fn c2' =>
(CApp (c1', c2'), loc)))
| CAbs (x, k, c) =>
S.bind2 (mfk k,
fn k' =>
S.map2 (mfc c,
fn c' =>
(CAbs (x, k', c'), loc)))
| CName _ => S.return2 cAll
| CRecord (k, xcs) =>
S.bind2 (mfk k,
fn k' =>
S.map2 (ListUtil.mapfold (fn (x, c) =>
S.bind2 (mfc x,
fn x' =>
S.map2 (mfc c,
fn c' =>
(x', c'))))
xcs,
fn xcs' =>
(CRecord (k', xcs'), loc)))
| CConcat (c1, c2) =>
S.bind2 (mfc c1,
fn c1' =>
S.map2 (mfc c2,
fn c2' =>
(CConcat (c1', c2'), loc)))
| CError => S.return2 cAll
| CUnif (_, _, ref (SOME c)) => mfc' c
| CUnif _ => S.return2 cAll
in
mfc
end
fun exists {kind, con} k =
case mapfold {kind = fn k => fn () =>
if kind k then
S.Return ()
else
S.Continue (k, ()),
con = fn c => fn () =>
if con c then
S.Return ()
else
S.Continue (c, ())} k () of
S.Return _ => true
| S.Continue _ => false
end
structure E = ElabEnv
fun declBinds env (d, _) =
case d of
DCon (x, n, k, _) => E.pushCNamedAs env x n k
end
|
