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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
datatype binder =
Rel of string * Elab.kind
| Named of string * Elab.kind
fun mapfoldB {kind = fk, con = fc, bind} =
let
val mfk = Kind.mapfold fk
fun mfc ctx c acc =
S.bindP (mfc' ctx c acc, fc ctx)
and mfc' ctx (cAll as (c, loc)) =
case c of
TFun (c1, c2) =>
S.bind2 (mfc ctx c1,
fn c1' =>
S.map2 (mfc ctx c2,
fn c2' =>
(TFun (c1', c2'), loc)))
| TCFun (e, x, k, c) =>
S.bind2 (mfk k,
fn k' =>
S.map2 (mfc (bind (ctx, Rel (x, k))) c,
fn c' =>
(TCFun (e, x, k', c'), loc)))
| TRecord c =>
S.map2 (mfc ctx c,
fn c' =>
(TRecord c', loc))
| CRel _ => S.return2 cAll
| CNamed _ => S.return2 cAll
| CApp (c1, c2) =>
S.bind2 (mfc ctx c1,
fn c1' =>
S.map2 (mfc ctx c2,
fn c2' =>
(CApp (c1', c2'), loc)))
| CAbs (x, k, c) =>
S.bind2 (mfk k,
fn k' =>
S.map2 (mfc (bind (ctx, Rel (x, k))) 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 ctx x,
fn x' =>
S.map2 (mfc ctx c,
fn c' =>
(x', c'))))
xcs,
fn xcs' =>
(CRecord (k', xcs'), loc)))
| CConcat (c1, c2) =>
S.bind2 (mfc ctx c1,
fn c1' =>
S.map2 (mfc ctx c2,
fn c2' =>
(CConcat (c1', c2'), loc)))
| CError => S.return2 cAll
| CUnif (_, _, ref (SOME c)) => mfc' ctx c
| CUnif _ => S.return2 cAll
in
mfc
end
fun mapfold {kind = fk, con = fc} =
mapfoldB {kind = fk,
con = fn () => fc,
bind = fn ((), _) => ()} ()
fun mapB {kind, con, bind} ctx c =
case mapfoldB {kind = fn k => fn () => S.Continue (kind k, ()),
con = fn ctx => fn c => fn () => S.Continue (con ctx c, ()),
bind = bind} ctx c () of
S.Continue (c, ()) => c
| S.Return _ => raise Fail "Con.mapB: Impossible"
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 Exp = struct
datatype binder =
RelC of string * Elab.kind
| NamedC of string * Elab.kind
| RelE of string * Elab.con
| NamedE of string * Elab.con
fun mapfoldB {kind = fk, con = fc, exp = fe, bind} =
let
val mfk = Kind.mapfold fk
fun bind' (ctx, b) =
let
val b' = case b of
Con.Rel x => RelC x
| Con.Named x => NamedC x
in
bind (ctx, b')
end
val mfc = Con.mapfoldB {kind = fk, con = fc, bind = bind'}
fun mfe ctx e acc =
S.bindP (mfe' ctx e acc, fe ctx)
and mfe' ctx (eAll as (e, loc)) =
case e of
EPrim _ => S.return2 eAll
| ERel _ => S.return2 eAll
| ENamed _ => S.return2 eAll
| EApp (e1, e2) =>
S.bind2 (mfe ctx e1,
fn e1' =>
S.map2 (mfe ctx e2,
fn e2' =>
(EApp (e1', e2'), loc)))
| EAbs (x, dom, ran, e) =>
S.bind2 (mfc ctx dom,
fn dom' =>
S.bind2 (mfc ctx ran,
fn ran' =>
S.map2 (mfe (bind (ctx, RelE (x, dom'))) e,
fn e' =>
(EAbs (x, dom', ran', e'), loc))))
| ECApp (e, c) =>
S.bind2 (mfe ctx e,
fn e' =>
S.map2 (mfc ctx c,
fn c' =>
(ECApp (e', c'), loc)))
| ECAbs (expl, x, k, e) =>
S.bind2 (mfk k,
fn k' =>
S.map2 (mfe (bind (ctx, RelC (x, k))) e,
fn e' =>
(ECAbs (expl, x, k', e'), loc)))
| ERecord xes =>
S.map2 (ListUtil.mapfold (fn (x, e) =>
S.bind2 (mfc ctx x,
fn x' =>
S.map2 (mfe ctx e,
fn e' =>
(x', e'))))
xes,
fn xes' =>
(ERecord xes', loc))
| EField (e, c, {field, rest}) =>
S.bind2 (mfe ctx e,
fn e' =>
S.bind2 (mfc ctx c,
fn c' =>
S.bind2 (mfc ctx field,
fn field' =>
S.map2 (mfc ctx rest,
fn rest' =>
(EField (e', c', {field = field', rest = rest'}), loc)))))
| EError => S.return2 eAll
in
mfe
end
fun mapfold {kind = fk, con = fc, exp = fe} =
mapfoldB {kind = fk,
con = fn () => fc,
exp = fn () => fe,
bind = fn ((), _) => ()} ()
fun exists {kind, con, exp} 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, ()),
exp = fn e => fn () =>
if exp e then
S.Return ()
else
S.Continue (e, ())} k () of
S.Return _ => true
| S.Continue _ => false
end
end
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